No functional changes.
Fix Kconfig description.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
source "drivers/staging/iio/accel/Kconfig"
source "drivers/staging/iio/adc/Kconfig"
source "drivers/staging/iio/addac/Kconfig"
+source "drivers/staging/iio/cdc/Kconfig"
source "drivers/staging/iio/dac/Kconfig"
source "drivers/staging/iio/dds/Kconfig"
source "drivers/staging/iio/gyro/Kconfig"
obj-y += accel/
obj-y += adc/
obj-y += addac/
+obj-y += cdc/
obj-y += dac/
obj-y += dds/
obj-y += gyro/
#
menu "Analog to digital converters"
-config AD7150
- tristate "Analog Devices ad7150/1/6 capacitive sensor driver"
- depends on I2C
- help
- Say yes here to build support for Analog Devices capacitive sensors.
- (ad7150, ad7151, ad7156) Provides direct access via sysfs.
-
-config AD7152
- tristate "Analog Devices ad7152/3 capacitive sensor driver"
- depends on I2C
- help
- Say yes here to build support for Analog Devices capacitive sensors.
- (ad7152, ad7153) Provides direct access via sysfs.
-
config AD7291
tristate "Analog Devices AD7291 ADC driver"
depends on I2C
To compile this driver as a module, choose M here: the
module will be called AD7793.
-config AD7746
- tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"
- depends on I2C
- help
- Say yes here to build support for Analog Devices capacitive sensors.
- (AD7745, AD7746, AD7747) Provides direct access via sysfs.
-
- To compile this driver as a module, choose M here: the
- module will be called ad7745.
-
config AD7816
tristate "Analog Devices AD7816/7/8 temperature sensor and ADC driver"
depends on SPI
ad7298-$(CONFIG_IIO_BUFFER) += ad7298_ring.o
obj-$(CONFIG_AD7298) += ad7298.o
-obj-$(CONFIG_AD7150) += ad7150.o
-obj-$(CONFIG_AD7152) += ad7152.o
obj-$(CONFIG_AD7291) += ad7291.o
-obj-$(CONFIG_AD7746) += ad7746.o
obj-$(CONFIG_AD7780) += ad7780.o
obj-$(CONFIG_AD7793) += ad7793.o
obj-$(CONFIG_AD7816) += ad7816.o
+++ /dev/null
-/*
- * AD7150 capacitive sensor driver supporting AD7150/1/6
- *
- * Copyright 2010-2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/module.h>
-
-#include "../iio.h"
-#include "../sysfs.h"
-
-/*
- * AD7150 registers definition
- */
-
-#define AD7150_STATUS 0
-#define AD7150_STATUS_OUT1 (1 << 3)
-#define AD7150_STATUS_OUT2 (1 << 5)
-#define AD7150_CH1_DATA_HIGH 1
-#define AD7150_CH2_DATA_HIGH 3
-#define AD7150_CH1_AVG_HIGH 5
-#define AD7150_CH2_AVG_HIGH 7
-#define AD7150_CH1_SENSITIVITY 9
-#define AD7150_CH1_THR_HOLD_H 9
-#define AD7150_CH1_TIMEOUT 10
-#define AD7150_CH1_SETUP 11
-#define AD7150_CH2_SENSITIVITY 12
-#define AD7150_CH2_THR_HOLD_H 12
-#define AD7150_CH2_TIMEOUT 13
-#define AD7150_CH2_SETUP 14
-#define AD7150_CFG 15
-#define AD7150_CFG_FIX (1 << 7)
-#define AD7150_PD_TIMER 16
-#define AD7150_CH1_CAPDAC 17
-#define AD7150_CH2_CAPDAC 18
-#define AD7150_SN3 19
-#define AD7150_SN2 20
-#define AD7150_SN1 21
-#define AD7150_SN0 22
-#define AD7150_ID 23
-
-/**
- * struct ad7150_chip_info - instance specific chip data
- * @client: i2c client for this device
- * @current_event: device always has one type of event enabled.
- * This element stores the event code of the current one.
- * @threshold: thresholds for simple capacitance value events
- * @thresh_sensitivity: threshold for simple capacitance offset
- * from 'average' value.
- * @mag_sensitity: threshold for magnitude of capacitance offset from
- * from 'average' value.
- * @thresh_timeout: a timeout, in samples from the moment an
- * adaptive threshold event occurs to when the average
- * value jumps to current value.
- * @mag_timeout: a timeout, in sample from the moment an
- * adaptive magnitude event occurs to when the average
- * value jumps to the current value.
- * @old_state: store state from previous event, allowing confirmation
- * of new condition.
- * @conversion_mode: the current conversion mode.
- * @state_lock: ensure consistent state of this structure wrt the
- * hardware.
- */
-struct ad7150_chip_info {
- struct i2c_client *client;
- u64 current_event;
- u16 threshold[2][2];
- u8 thresh_sensitivity[2][2];
- u8 mag_sensitivity[2][2];
- u8 thresh_timeout[2][2];
- u8 mag_timeout[2][2];
- int old_state;
- char *conversion_mode;
- struct mutex state_lock;
-};
-
-/*
- * sysfs nodes
- */
-
-static const u8 ad7150_addresses[][6] = {
- { AD7150_CH1_DATA_HIGH, AD7150_CH1_AVG_HIGH,
- AD7150_CH1_SETUP, AD7150_CH1_THR_HOLD_H,
- AD7150_CH1_SENSITIVITY, AD7150_CH1_TIMEOUT },
- { AD7150_CH2_DATA_HIGH, AD7150_CH2_AVG_HIGH,
- AD7150_CH2_SETUP, AD7150_CH2_THR_HOLD_H,
- AD7150_CH2_SENSITIVITY, AD7150_CH2_TIMEOUT },
-};
-
-static int ad7150_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long mask)
-{
- int ret;
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
-
- switch (mask) {
- case 0:
- ret = i2c_smbus_read_word_data(chip->client,
- ad7150_addresses[chan->channel][0]);
- if (ret < 0)
- return ret;
- *val = swab16(ret);
- return IIO_VAL_INT;
- case (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE):
- ret = i2c_smbus_read_word_data(chip->client,
- ad7150_addresses[chan->channel][1]);
- if (ret < 0)
- return ret;
- *val = swab16(ret);
- return IIO_VAL_INT;
- default:
- return -EINVAL;
- }
-}
-
-static int ad7150_read_event_config(struct iio_dev *indio_dev, u64 event_code)
-{
- int ret;
- u8 threshtype;
- bool adaptive;
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING);
-
- ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
- if (ret < 0)
- return ret;
-
- threshtype = (ret >> 5) & 0x03;
- adaptive = !!(ret & 0x80);
-
- switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- if (rising)
- return adaptive && (threshtype == 0x1);
- else
- return adaptive && (threshtype == 0x0);
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- if (rising)
- return adaptive && (threshtype == 0x3);
- else
- return adaptive && (threshtype == 0x2);
-
- case IIO_EV_TYPE_THRESH:
- if (rising)
- return !adaptive && (threshtype == 0x1);
- else
- return !adaptive && (threshtype == 0x0);
- };
- return -EINVAL;
-}
-
-/* lock should be held */
-static int ad7150_write_event_params(struct iio_dev *indio_dev, u64 event_code)
-{
- int ret;
- u16 value;
- u8 sens, timeout;
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
- int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING);
-
- if (event_code != chip->current_event)
- return 0;
-
- switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
- /* Note completely different from the adaptive versions */
- case IIO_EV_TYPE_THRESH:
- value = chip->threshold[rising][chan];
- ret = i2c_smbus_write_word_data(chip->client,
- ad7150_addresses[chan][3],
- swab16(value));
- if (ret < 0)
- return ret;
- return 0;
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- sens = chip->mag_sensitivity[rising][chan];
- timeout = chip->mag_timeout[rising][chan];
- break;
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- sens = chip->thresh_sensitivity[rising][chan];
- timeout = chip->thresh_timeout[rising][chan];
- break;
- default:
- return -EINVAL;
- };
- ret = i2c_smbus_write_byte_data(chip->client,
- ad7150_addresses[chan][4],
- sens);
- if (ret < 0)
- return ret;
-
- ret = i2c_smbus_write_byte_data(chip->client,
- ad7150_addresses[chan][5],
- timeout);
- if (ret < 0)
- return ret;
-
- return 0;
-}
-
-static int ad7150_write_event_config(struct iio_dev *indio_dev,
- u64 event_code, int state)
-{
- u8 thresh_type, cfg, adaptive;
- int ret;
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING);
-
- /* Something must always be turned on */
- if (state == 0)
- return -EINVAL;
-
- if (event_code == chip->current_event)
- return 0;
- mutex_lock(&chip->state_lock);
- ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
- if (ret < 0)
- goto error_ret;
-
- cfg = ret & ~((0x03 << 5) | (0x1 << 7));
-
- switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- adaptive = 1;
- if (rising)
- thresh_type = 0x1;
- else
- thresh_type = 0x0;
- break;
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- adaptive = 1;
- if (rising)
- thresh_type = 0x3;
- else
- thresh_type = 0x2;
- break;
- case IIO_EV_TYPE_THRESH:
- adaptive = 0;
- if (rising)
- thresh_type = 0x1;
- else
- thresh_type = 0x0;
- break;
- default:
- ret = -EINVAL;
- goto error_ret;
- };
-
- cfg |= (!adaptive << 7) | (thresh_type << 5);
-
- ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg);
- if (ret < 0)
- goto error_ret;
-
- chip->current_event = event_code;
-
- /* update control attributes */
- ret = ad7150_write_event_params(indio_dev, event_code);
-error_ret:
- mutex_unlock(&chip->state_lock);
-
- return 0;
-}
-
-static int ad7150_read_event_value(struct iio_dev *indio_dev,
- u64 event_code,
- int *val)
-{
- int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING);
-
- /* Complex register sharing going on here */
- switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- *val = chip->mag_sensitivity[rising][chan];
- return 0;
-
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- *val = chip->thresh_sensitivity[rising][chan];
- return 0;
-
- case IIO_EV_TYPE_THRESH:
- *val = chip->threshold[rising][chan];
- return 0;
-
- default:
- return -EINVAL;
- };
-}
-
-static int ad7150_write_event_value(struct iio_dev *indio_dev,
- u64 event_code,
- int val)
-{
- int ret;
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
- int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING);
-
- mutex_lock(&chip->state_lock);
- switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- chip->mag_sensitivity[rising][chan] = val;
- break;
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- chip->thresh_sensitivity[rising][chan] = val;
- break;
- case IIO_EV_TYPE_THRESH:
- chip->threshold[rising][chan] = val;
- break;
- default:
- ret = -EINVAL;
- goto error_ret;
- };
-
- /* write back if active */
- ret = ad7150_write_event_params(indio_dev, event_code);
-
-error_ret:
- mutex_unlock(&chip->state_lock);
- return ret;
-}
-
-static ssize_t ad7150_show_timeout(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- u8 value;
-
- /* use the event code for consistency reasons */
- int chan = IIO_EVENT_CODE_EXTRACT_NUM(this_attr->address);
- int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
- == IIO_EV_DIR_RISING);
-
- switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- value = chip->mag_timeout[rising][chan];
- break;
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- value = chip->thresh_timeout[rising][chan];
- break;
- default:
- return -EINVAL;
- };
-
- return sprintf(buf, "%d\n", value);
-}
-
-static ssize_t ad7150_store_timeout(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int chan = IIO_EVENT_CODE_EXTRACT_NUM(this_attr->address);
- int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address) ==
- IIO_EV_DIR_RISING);
- u8 data;
- int ret;
-
- ret = kstrtou8(buf, 10, &data);
- if (ret < 0)
- return ret;
-
- mutex_lock(&chip->state_lock);
- switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- chip->mag_timeout[rising][chan] = data;
- break;
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- chip->thresh_timeout[rising][chan] = data;
- break;
- default:
- ret = -EINVAL;
- goto error_ret;
- };
-
- ret = ad7150_write_event_params(indio_dev, this_attr->address);
-error_ret:
- mutex_unlock(&chip->state_lock);
-
- if (ret < 0)
- return ret;
-
- return len;
-}
-
-#define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir) \
- IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \
- S_IRUGO | S_IWUSR, \
- &ad7150_show_timeout, \
- &ad7150_store_timeout, \
- IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, \
- chan, \
- IIO_EV_TYPE_##ev_type, \
- IIO_EV_DIR_##ev_dir))
-static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
-static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
-static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
-static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
-static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
-static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
-static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
-static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
-
-static const struct iio_chan_spec ad7150_channels[] = {
- {
- .type = IIO_CAPACITANCE,
- .indexed = 1,
- .channel = 0,
- .info_mask = (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE),
- .event_mask =
- IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
- IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
- IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
- IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
- IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
- IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
- }, {
- .type = IIO_CAPACITANCE,
- .indexed = 1,
- .channel = 1,
- .info_mask = (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE),
- .event_mask =
- IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
- IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
- IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
- IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
- IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
- IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
- },
-};
-
-/*
- * threshold events
- */
-
-static irqreturn_t ad7150_event_handler(int irq, void *private)
-{
- struct iio_dev *indio_dev = private;
- struct ad7150_chip_info *chip = iio_priv(indio_dev);
- u8 int_status;
- s64 timestamp = iio_get_time_ns();
- int ret;
-
- ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS);
- if (ret < 0)
- return IRQ_HANDLED;
-
- int_status = ret;
-
- if ((int_status & AD7150_STATUS_OUT1) &&
- !(chip->old_state & AD7150_STATUS_OUT1))
- iio_push_event(indio_dev,
- IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
- 0,
- IIO_EV_TYPE_THRESH,
- IIO_EV_DIR_RISING),
- timestamp);
- else if ((!(int_status & AD7150_STATUS_OUT1)) &&
- (chip->old_state & AD7150_STATUS_OUT1))
- iio_push_event(indio_dev,
- IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
- 0,
- IIO_EV_TYPE_THRESH,
- IIO_EV_DIR_FALLING),
- timestamp);
-
- if ((int_status & AD7150_STATUS_OUT2) &&
- !(chip->old_state & AD7150_STATUS_OUT2))
- iio_push_event(indio_dev,
- IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
- 1,
- IIO_EV_TYPE_THRESH,
- IIO_EV_DIR_RISING),
- timestamp);
- else if ((!(int_status & AD7150_STATUS_OUT2)) &&
- (chip->old_state & AD7150_STATUS_OUT2))
- iio_push_event(indio_dev,
- IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
- 1,
- IIO_EV_TYPE_THRESH,
- IIO_EV_DIR_FALLING),
- timestamp);
- /* store the status to avoid repushing same events */
- chip->old_state = int_status;
-
- return IRQ_HANDLED;
-}
-
-/* Timeouts not currently handled by core */
-static struct attribute *ad7150_event_attributes[] = {
- &iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout
- .dev_attr.attr,
- &iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout
- .dev_attr.attr,
- &iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout
- .dev_attr.attr,
- &iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout
- .dev_attr.attr,
- &iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout
- .dev_attr.attr,
- &iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout
- .dev_attr.attr,
- &iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout
- .dev_attr.attr,
- &iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout
- .dev_attr.attr,
- NULL,
-};
-
-static struct attribute_group ad7150_event_attribute_group = {
- .attrs = ad7150_event_attributes,
- .name = "events",
-};
-
-static const struct iio_info ad7150_info = {
- .event_attrs = &ad7150_event_attribute_group,
- .driver_module = THIS_MODULE,
- .read_raw = &ad7150_read_raw,
- .read_event_config = &ad7150_read_event_config,
- .write_event_config = &ad7150_write_event_config,
- .read_event_value = &ad7150_read_event_value,
- .write_event_value = &ad7150_write_event_value,
-};
-
-/*
- * device probe and remove
- */
-
-static int __devinit ad7150_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- int ret;
- struct ad7150_chip_info *chip;
- struct iio_dev *indio_dev;
-
- indio_dev = iio_allocate_device(sizeof(*chip));
- if (indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- chip = iio_priv(indio_dev);
- mutex_init(&chip->state_lock);
- /* this is only used for device removal purposes */
- i2c_set_clientdata(client, indio_dev);
-
- chip->client = client;
-
- indio_dev->name = id->name;
- indio_dev->channels = ad7150_channels;
- indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
- /* Establish that the iio_dev is a child of the i2c device */
- indio_dev->dev.parent = &client->dev;
-
- indio_dev->info = &ad7150_info;
-
- indio_dev->modes = INDIO_DIRECT_MODE;
-
- if (client->irq) {
- ret = request_threaded_irq(client->irq,
- NULL,
- &ad7150_event_handler,
- IRQF_TRIGGER_RISING |
- IRQF_TRIGGER_FALLING,
- "ad7150_irq1",
- indio_dev);
- if (ret)
- goto error_free_dev;
- }
-
- if (client->dev.platform_data) {
- ret = request_threaded_irq(*(unsigned int *)
- client->dev.platform_data,
- NULL,
- &ad7150_event_handler,
- IRQF_TRIGGER_RISING |
- IRQF_TRIGGER_FALLING,
- "ad7150_irq2",
- indio_dev);
- if (ret)
- goto error_free_irq;
- }
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_free_irq2;
-
- dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n",
- id->name, client->irq);
-
- return 0;
-error_free_irq2:
- if (client->dev.platform_data)
- free_irq(*(unsigned int *)client->dev.platform_data,
- indio_dev);
-error_free_irq:
- if (client->irq)
- free_irq(client->irq, indio_dev);
-error_free_dev:
- iio_free_device(indio_dev);
-error_ret:
- return ret;
-}
-
-static int __devexit ad7150_remove(struct i2c_client *client)
-{
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
- iio_device_unregister(indio_dev);
- if (client->irq)
- free_irq(client->irq, indio_dev);
-
- if (client->dev.platform_data)
- free_irq(*(unsigned int *)client->dev.platform_data, indio_dev);
-
- iio_free_device(indio_dev);
-
- return 0;
-}
-
-static const struct i2c_device_id ad7150_id[] = {
- { "ad7150", 0 },
- { "ad7151", 0 },
- { "ad7156", 0 },
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ad7150_id);
-
-static struct i2c_driver ad7150_driver = {
- .driver = {
- .name = "ad7150",
- },
- .probe = ad7150_probe,
- .remove = __devexit_p(ad7150_remove),
- .id_table = ad7150_id,
-};
-
-static __init int ad7150_init(void)
-{
- return i2c_add_driver(&ad7150_driver);
-}
-
-static __exit void ad7150_exit(void)
-{
- i2c_del_driver(&ad7150_driver);
-}
-
-MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
-MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver");
-MODULE_LICENSE("GPL v2");
-
-module_init(ad7150_init);
-module_exit(ad7150_exit);
+++ /dev/null
-/*
- * AD7152 capacitive sensor driver supporting AD7152/3
- *
- * Copyright 2010-2011a Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/i2c.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-
-#include "../iio.h"
-#include "../sysfs.h"
-
-/*
- * TODO: Check compliance of calibbias with abi (units)
- */
-/*
- * AD7152 registers definition
- */
-
-#define AD7152_REG_STATUS 0
-#define AD7152_REG_CH1_DATA_HIGH 1
-#define AD7152_REG_CH2_DATA_HIGH 3
-#define AD7152_REG_CH1_OFFS_HIGH 5
-#define AD7152_REG_CH2_OFFS_HIGH 7
-#define AD7152_REG_CH1_GAIN_HIGH 9
-#define AD7152_REG_CH1_SETUP 11
-#define AD7152_REG_CH2_GAIN_HIGH 12
-#define AD7152_REG_CH2_SETUP 14
-#define AD7152_REG_CFG 15
-#define AD7152_REG_RESEVERD 16
-#define AD7152_REG_CAPDAC_POS 17
-#define AD7152_REG_CAPDAC_NEG 18
-#define AD7152_REG_CFG2 26
-
-/* Status Register Bit Designations (AD7152_REG_STATUS) */
-#define AD7152_STATUS_RDY1 (1 << 0)
-#define AD7152_STATUS_RDY2 (1 << 1)
-#define AD7152_STATUS_C1C2 (1 << 2)
-#define AD7152_STATUS_PWDN (1 << 7)
-
-/* Setup Register Bit Designations (AD7152_REG_CHx_SETUP) */
-#define AD7152_SETUP_CAPDIFF (1 << 5)
-#define AD7152_SETUP_RANGE_2pF (0 << 6)
-#define AD7152_SETUP_RANGE_0_5pF (1 << 6)
-#define AD7152_SETUP_RANGE_1pF (2 << 6)
-#define AD7152_SETUP_RANGE_4pF (3 << 6)
-#define AD7152_SETUP_RANGE(x) ((x) << 6)
-
-/* Config Register Bit Designations (AD7152_REG_CFG) */
-#define AD7152_CONF_CH2EN (1 << 3)
-#define AD7152_CONF_CH1EN (1 << 4)
-#define AD7152_CONF_MODE_IDLE (0 << 0)
-#define AD7152_CONF_MODE_CONT_CONV (1 << 0)
-#define AD7152_CONF_MODE_SINGLE_CONV (2 << 0)
-#define AD7152_CONF_MODE_OFFS_CAL (5 << 0)
-#define AD7152_CONF_MODE_GAIN_CAL (6 << 0)
-
-/* Capdac Register Bit Designations (AD7152_REG_CAPDAC_XXX) */
-#define AD7152_CAPDAC_DACEN (1 << 7)
-#define AD7152_CAPDAC_DACP(x) ((x) & 0x1F)
-
-/* CFG2 Register Bit Designations (AD7152_REG_CFG2) */
-#define AD7152_CFG2_OSR(x) (((x) & 0x3) << 4)
-
-enum {
- AD7152_DATA,
- AD7152_OFFS,
- AD7152_GAIN,
- AD7152_SETUP
-};
-
-/*
- * struct ad7152_chip_info - chip specifc information
- */
-
-struct ad7152_chip_info {
- struct i2c_client *client;
- /*
- * Capacitive channel digital filter setup;
- * conversion time/update rate setup per channel
- */
- u8 filter_rate_setup;
- u8 setup[2];
-};
-
-static inline ssize_t ad7152_start_calib(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len,
- u8 regval)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7152_chip_info *chip = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- bool doit;
- int ret, timeout = 10;
-
- ret = strtobool(buf, &doit);
- if (ret < 0)
- return ret;
-
- if (!doit)
- return 0;
-
- if (this_attr->address == 0)
- regval |= AD7152_CONF_CH1EN;
- else
- regval |= AD7152_CONF_CH2EN;
-
- mutex_lock(&indio_dev->mlock);
- ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG, regval);
- if (ret < 0) {
- mutex_unlock(&indio_dev->mlock);
- return ret;
- }
-
- do {
- mdelay(20);
- ret = i2c_smbus_read_byte_data(chip->client, AD7152_REG_CFG);
- if (ret < 0) {
- mutex_unlock(&indio_dev->mlock);
- return ret;
- }
- } while ((ret == regval) && timeout--);
-
- mutex_unlock(&indio_dev->mlock);
- return len;
-}
-static ssize_t ad7152_start_offset_calib(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- return ad7152_start_calib(dev, attr, buf, len,
- AD7152_CONF_MODE_OFFS_CAL);
-}
-static ssize_t ad7152_start_gain_calib(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- return ad7152_start_calib(dev, attr, buf, len,
- AD7152_CONF_MODE_GAIN_CAL);
-}
-
-static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration,
- S_IWUSR, NULL, ad7152_start_offset_calib, 0);
-static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration,
- S_IWUSR, NULL, ad7152_start_offset_calib, 1);
-static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration,
- S_IWUSR, NULL, ad7152_start_gain_calib, 0);
-static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
- S_IWUSR, NULL, ad7152_start_gain_calib, 1);
-
-/* Values are Update Rate (Hz), Conversion Time (ms) + 1*/
-static const unsigned char ad7152_filter_rate_table[][2] = {
- {200, 5 + 1}, {50, 20 + 1}, {20, 50 + 1}, {17, 60 + 1},
-};
-
-static ssize_t ad7152_show_filter_rate_setup(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7152_chip_info *chip = iio_priv(indio_dev);
-
- return sprintf(buf, "%d\n",
- ad7152_filter_rate_table[chip->filter_rate_setup][0]);
-}
-
-static ssize_t ad7152_store_filter_rate_setup(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7152_chip_info *chip = iio_priv(indio_dev);
- u8 data;
- int ret, i;
-
- ret = kstrtou8(buf, 10, &data);
- if (ret < 0)
- return ret;
-
- for (i = 0; i < ARRAY_SIZE(ad7152_filter_rate_table); i++)
- if (data >= ad7152_filter_rate_table[i][0])
- break;
-
- if (i >= ARRAY_SIZE(ad7152_filter_rate_table))
- i = ARRAY_SIZE(ad7152_filter_rate_table) - 1;
-
- mutex_lock(&indio_dev->mlock);
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7152_REG_CFG2, AD7152_CFG2_OSR(i));
- if (ret < 0) {
- mutex_unlock(&indio_dev->mlock);
- return ret;
- }
-
- chip->filter_rate_setup = i;
- mutex_unlock(&indio_dev->mlock);
-
- return len;
-}
-
-static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
- ad7152_show_filter_rate_setup,
- ad7152_store_filter_rate_setup);
-
-static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("200 50 20 17");
-
-static IIO_CONST_ATTR(in_capacitance_scale_available,
- "0.000061050 0.000030525 0.000015263 0.000007631");
-
-static struct attribute *ad7152_attributes[] = {
- &iio_dev_attr_sampling_frequency.dev_attr.attr,
- &iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
- &iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr,
- &iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
- &iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
- &iio_const_attr_in_capacitance_scale_available.dev_attr.attr,
- &iio_const_attr_sampling_frequency_available.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7152_attribute_group = {
- .attrs = ad7152_attributes,
-};
-
-static const u8 ad7152_addresses[][4] = {
- { AD7152_REG_CH1_DATA_HIGH, AD7152_REG_CH1_OFFS_HIGH,
- AD7152_REG_CH1_GAIN_HIGH, AD7152_REG_CH1_SETUP },
- { AD7152_REG_CH2_DATA_HIGH, AD7152_REG_CH2_OFFS_HIGH,
- AD7152_REG_CH2_GAIN_HIGH, AD7152_REG_CH2_SETUP },
-};
-
-/* Values are nano relative to pf base. */
-static const int ad7152_scale_table[] = {
- 30525, 7631, 15263, 61050
-};
-
-static int ad7152_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val,
- int val2,
- long mask)
-{
- struct ad7152_chip_info *chip = iio_priv(indio_dev);
- int ret, i;
-
- mutex_lock(&indio_dev->mlock);
-
- switch (mask) {
- case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
- if (val != 1) {
- ret = -EINVAL;
- goto out;
- }
-
- val = (val2 * 1024) / 15625;
-
- ret = i2c_smbus_write_word_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_GAIN],
- swab16(val));
- if (ret < 0)
- goto out;
-
- ret = 0;
- break;
-
- case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
- if ((val < 0) | (val > 0xFFFF)) {
- ret = -EINVAL;
- goto out;
- }
- ret = i2c_smbus_write_word_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_OFFS],
- swab16(val));
- if (ret < 0)
- goto out;
-
- ret = 0;
- break;
- case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
- if (val != 0) {
- ret = -EINVAL;
- goto out;
- }
- for (i = 0; i < ARRAY_SIZE(ad7152_scale_table); i++)
- if (val2 == ad7152_scale_table[i])
- break;
-
- chip->setup[chan->channel] &= ~AD7152_SETUP_RANGE_4pF;
- chip->setup[chan->channel] |= AD7152_SETUP_RANGE(i);
-
- ret = i2c_smbus_write_byte_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_SETUP],
- chip->setup[chan->channel]);
- if (ret < 0)
- goto out;
-
- ret = 0;
- break;
- default:
- ret = -EINVAL;
- }
-
-out:
- mutex_unlock(&indio_dev->mlock);
- return ret;
-}
-static int ad7152_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val, int *val2,
- long mask)
-{
- struct ad7152_chip_info *chip = iio_priv(indio_dev);
- int ret;
- u8 regval = 0;
-
- mutex_lock(&indio_dev->mlock);
-
- switch (mask) {
- case 0:
- /* First set whether in differential mode */
-
- regval = chip->setup[chan->channel];
-
- if (chan->differential)
- chip->setup[chan->channel] |= AD7152_SETUP_CAPDIFF;
- else
- chip->setup[chan->channel] &= ~AD7152_SETUP_CAPDIFF;
-
- if (regval != chip->setup[chan->channel]) {
- ret = i2c_smbus_write_byte_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_SETUP],
- chip->setup[chan->channel]);
- if (ret < 0)
- goto out;
- }
- /* Make sure the channel is enabled */
- if (chan->channel == 0)
- regval = AD7152_CONF_CH1EN;
- else
- regval = AD7152_CONF_CH2EN;
-
- /* Trigger a single read */
- regval |= AD7152_CONF_MODE_SINGLE_CONV;
- ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG,
- regval);
- if (ret < 0)
- goto out;
-
- msleep(ad7152_filter_rate_table[chip->filter_rate_setup][1]);
- /* Now read the actual register */
- ret = i2c_smbus_read_word_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_DATA]);
- if (ret < 0)
- goto out;
- *val = swab16(ret);
-
- if (chan->differential)
- *val -= 0x8000;
-
- ret = IIO_VAL_INT;
- break;
- case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
-
- ret = i2c_smbus_read_word_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_GAIN]);
- if (ret < 0)
- goto out;
- /* 1 + gain_val / 2^16 */
- *val = 1;
- *val2 = (15625 * swab16(ret)) / 1024;
-
- ret = IIO_VAL_INT_PLUS_MICRO;
- break;
- case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
- ret = i2c_smbus_read_word_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_OFFS]);
- if (ret < 0)
- goto out;
- *val = swab16(ret);
-
- ret = IIO_VAL_INT;
- break;
- case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
- ret = i2c_smbus_read_byte_data(chip->client,
- ad7152_addresses[chan->channel][AD7152_SETUP]);
- if (ret < 0)
- goto out;
- *val = 0;
- *val2 = ad7152_scale_table[ret >> 6];
-
- ret = IIO_VAL_INT_PLUS_NANO;
- break;
- default:
- ret = -EINVAL;
- };
-out:
- mutex_unlock(&indio_dev->mlock);
- return ret;
-}
-
-static int ad7152_write_raw_get_fmt(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- long mask)
-{
- switch (mask) {
- case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
- return IIO_VAL_INT_PLUS_NANO;
- default:
- return IIO_VAL_INT_PLUS_MICRO;
- }
-}
-
-static const struct iio_info ad7152_info = {
- .attrs = &ad7152_attribute_group,
- .read_raw = &ad7152_read_raw,
- .write_raw = &ad7152_write_raw,
- .write_raw_get_fmt = &ad7152_write_raw_get_fmt,
- .driver_module = THIS_MODULE,
-};
-
-static const struct iio_chan_spec ad7152_channels[] = {
- {
- .type = IIO_CAPACITANCE,
- .indexed = 1,
- .channel = 0,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
- }, {
- .type = IIO_CAPACITANCE,
- .differential = 1,
- .indexed = 1,
- .channel = 0,
- .channel2 = 2,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
- }, {
- .type = IIO_CAPACITANCE,
- .indexed = 1,
- .channel = 1,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
- }, {
- .type = IIO_CAPACITANCE,
- .differential = 1,
- .indexed = 1,
- .channel = 1,
- .channel2 = 3,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
- }
-};
-/*
- * device probe and remove
- */
-
-static int __devinit ad7152_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- int ret = 0;
- struct ad7152_chip_info *chip;
- struct iio_dev *indio_dev;
-
- indio_dev = iio_allocate_device(sizeof(*chip));
- if (indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- chip = iio_priv(indio_dev);
- /* this is only used for device removal purposes */
- i2c_set_clientdata(client, indio_dev);
-
- chip->client = client;
-
- /* Establish that the iio_dev is a child of the i2c device */
- indio_dev->name = id->name;
- indio_dev->dev.parent = &client->dev;
- indio_dev->info = &ad7152_info;
- indio_dev->channels = ad7152_channels;
- if (id->driver_data == 0)
- indio_dev->num_channels = ARRAY_SIZE(ad7152_channels);
- else
- indio_dev->num_channels = 2;
- indio_dev->num_channels = ARRAY_SIZE(ad7152_channels);
- indio_dev->modes = INDIO_DIRECT_MODE;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_free_dev;
-
- dev_err(&client->dev, "%s capacitive sensor registered\n", id->name);
-
- return 0;
-
-error_free_dev:
- iio_free_device(indio_dev);
-error_ret:
- return ret;
-}
-
-static int __devexit ad7152_remove(struct i2c_client *client)
-{
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
- iio_device_unregister(indio_dev);
- iio_free_device(indio_dev);
-
- return 0;
-}
-
-static const struct i2c_device_id ad7152_id[] = {
- { "ad7152", 0 },
- { "ad7153", 1 },
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ad7152_id);
-
-static struct i2c_driver ad7152_driver = {
- .driver = {
- .name = KBUILD_MODNAME,
- },
- .probe = ad7152_probe,
- .remove = __devexit_p(ad7152_remove),
- .id_table = ad7152_id,
-};
-
-static __init int ad7152_init(void)
-{
- return i2c_add_driver(&ad7152_driver);
-}
-
-static __exit void ad7152_exit(void)
-{
- i2c_del_driver(&ad7152_driver);
-}
-
-MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
-MODULE_DESCRIPTION("Analog Devices AD7152/3 capacitive sensor driver");
-MODULE_LICENSE("GPL v2");
-
-module_init(ad7152_init);
-module_exit(ad7152_exit);
+++ /dev/null
-/*
- * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/i2c.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-#include <linux/stat.h>
-
-#include "../iio.h"
-#include "../sysfs.h"
-
-#include "ad7746.h"
-
-/*
- * AD7746 Register Definition
- */
-
-#define AD7746_REG_STATUS 0
-#define AD7746_REG_CAP_DATA_HIGH 1
-#define AD7746_REG_CAP_DATA_MID 2
-#define AD7746_REG_CAP_DATA_LOW 3
-#define AD7746_REG_VT_DATA_HIGH 4
-#define AD7746_REG_VT_DATA_MID 5
-#define AD7746_REG_VT_DATA_LOW 6
-#define AD7746_REG_CAP_SETUP 7
-#define AD7746_REG_VT_SETUP 8
-#define AD7746_REG_EXC_SETUP 9
-#define AD7746_REG_CFG 10
-#define AD7746_REG_CAPDACA 11
-#define AD7746_REG_CAPDACB 12
-#define AD7746_REG_CAP_OFFH 13
-#define AD7746_REG_CAP_OFFL 14
-#define AD7746_REG_CAP_GAINH 15
-#define AD7746_REG_CAP_GAINL 16
-#define AD7746_REG_VOLT_GAINH 17
-#define AD7746_REG_VOLT_GAINL 18
-
-/* Status Register Bit Designations (AD7746_REG_STATUS) */
-#define AD7746_STATUS_EXCERR (1 << 3)
-#define AD7746_STATUS_RDY (1 << 2)
-#define AD7746_STATUS_RDYVT (1 << 1)
-#define AD7746_STATUS_RDYCAP (1 << 0)
-
-/* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
-#define AD7746_CAPSETUP_CAPEN (1 << 7)
-#define AD7746_CAPSETUP_CIN2 (1 << 6) /* AD7746 only */
-#define AD7746_CAPSETUP_CAPDIFF (1 << 5)
-#define AD7746_CAPSETUP_CACHOP (1 << 0)
-
-/* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */
-#define AD7746_VTSETUP_VTEN (1 << 7)
-#define AD7746_VTSETUP_VTMD_INT_TEMP (0 << 5)
-#define AD7746_VTSETUP_VTMD_EXT_TEMP (1 << 5)
-#define AD7746_VTSETUP_VTMD_VDD_MON (2 << 5)
-#define AD7746_VTSETUP_VTMD_EXT_VIN (3 << 5)
-#define AD7746_VTSETUP_EXTREF (1 << 4)
-#define AD7746_VTSETUP_VTSHORT (1 << 1)
-#define AD7746_VTSETUP_VTCHOP (1 << 0)
-
-/* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
-#define AD7746_EXCSETUP_CLKCTRL (1 << 7)
-#define AD7746_EXCSETUP_EXCON (1 << 6)
-#define AD7746_EXCSETUP_EXCB (1 << 5)
-#define AD7746_EXCSETUP_NEXCB (1 << 4)
-#define AD7746_EXCSETUP_EXCA (1 << 3)
-#define AD7746_EXCSETUP_NEXCA (1 << 2)
-#define AD7746_EXCSETUP_EXCLVL(x) (((x) & 0x3) << 0)
-
-/* Config Register Bit Designations (AD7746_REG_CFG) */
-#define AD7746_CONF_VTFS(x) ((x) << 6)
-#define AD7746_CONF_CAPFS(x) ((x) << 3)
-#define AD7746_CONF_MODE_IDLE (0 << 0)
-#define AD7746_CONF_MODE_CONT_CONV (1 << 0)
-#define AD7746_CONF_MODE_SINGLE_CONV (2 << 0)
-#define AD7746_CONF_MODE_PWRDN (3 << 0)
-#define AD7746_CONF_MODE_OFFS_CAL (5 << 0)
-#define AD7746_CONF_MODE_GAIN_CAL (6 << 0)
-
-/* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */
-#define AD7746_CAPDAC_DACEN (1 << 7)
-#define AD7746_CAPDAC_DACP(x) ((x) & 0x7F)
-
-/*
- * struct ad7746_chip_info - chip specifc information
- */
-
-struct ad7746_chip_info {
- struct i2c_client *client;
- /*
- * Capacitive channel digital filter setup;
- * conversion time/update rate setup per channel
- */
- u8 config;
- u8 cap_setup;
- u8 vt_setup;
- u8 capdac[2][2];
- s8 capdac_set;
-};
-
-enum ad7746_chan {
- VIN,
- VIN_VDD,
- TEMP_INT,
- TEMP_EXT,
- CIN1,
- CIN1_DIFF,
- CIN2,
- CIN2_DIFF,
-};
-
-static const struct iio_chan_spec ad7746_channels[] = {
- [VIN] = {
- .type = IIO_VOLTAGE,
- .indexed = 1,
- .channel = 0,
- .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED),
- .address = AD7746_REG_VT_DATA_HIGH << 8 |
- AD7746_VTSETUP_VTMD_EXT_VIN,
- },
- [VIN_VDD] = {
- .type = IIO_VOLTAGE,
- .indexed = 1,
- .channel = 1,
- .extend_name = "supply",
- .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED),
- .address = AD7746_REG_VT_DATA_HIGH << 8 |
- AD7746_VTSETUP_VTMD_VDD_MON,
- },
- [TEMP_INT] = {
- .type = IIO_TEMP,
- .indexed = 1,
- .channel = 0,
- .processed_val = IIO_PROCESSED,
- .address = AD7746_REG_VT_DATA_HIGH << 8 |
- AD7746_VTSETUP_VTMD_INT_TEMP,
- },
- [TEMP_EXT] = {
- .type = IIO_TEMP,
- .indexed = 1,
- .channel = 1,
- .processed_val = IIO_PROCESSED,
- .address = AD7746_REG_VT_DATA_HIGH << 8 |
- AD7746_VTSETUP_VTMD_EXT_TEMP,
- },
- [CIN1] = {
- .type = IIO_CAPACITANCE,
- .indexed = 1,
- .channel = 0,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
- (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SHARED),
- .address = AD7746_REG_CAP_DATA_HIGH << 8,
- },
- [CIN1_DIFF] = {
- .type = IIO_CAPACITANCE,
- .differential = 1,
- .indexed = 1,
- .channel = 0,
- .channel2 = 2,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
- (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SHARED),
- .address = AD7746_REG_CAP_DATA_HIGH << 8 |
- AD7746_CAPSETUP_CAPDIFF
- },
- [CIN2] = {
- .type = IIO_CAPACITANCE,
- .indexed = 1,
- .channel = 1,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
- (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SHARED),
- .address = AD7746_REG_CAP_DATA_HIGH << 8 |
- AD7746_CAPSETUP_CIN2,
- },
- [CIN2_DIFF] = {
- .type = IIO_CAPACITANCE,
- .differential = 1,
- .indexed = 1,
- .channel = 1,
- .channel2 = 3,
- .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
- (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
- (1 << IIO_CHAN_INFO_SCALE_SHARED),
- .address = AD7746_REG_CAP_DATA_HIGH << 8 |
- AD7746_CAPSETUP_CAPDIFF | AD7746_CAPSETUP_CIN2,
- }
-};
-
-/* Values are Update Rate (Hz), Conversion Time (ms) + 1*/
-static const unsigned char ad7746_vt_filter_rate_table[][2] = {
- {50, 20 + 1}, {31, 32 + 1}, {16, 62 + 1}, {8, 122 + 1},
-};
-
-static const unsigned char ad7746_cap_filter_rate_table[][2] = {
- {91, 11 + 1}, {84, 12 + 1}, {50, 20 + 1}, {26, 38 + 1},
- {16, 62 + 1}, {13, 77 + 1}, {11, 92 + 1}, {9, 110 + 1},
-};
-
-static int ad7746_select_channel(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan)
-{
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
- int ret, delay;
- u8 vt_setup, cap_setup;
-
- switch (chan->type) {
- case IIO_CAPACITANCE:
- cap_setup = (chan->address & 0xFF) | AD7746_CAPSETUP_CAPEN;
- vt_setup = chip->vt_setup & ~AD7746_VTSETUP_VTEN;
- delay = ad7746_cap_filter_rate_table[(chip->config >> 3) &
- 0x7][1];
-
- if (chip->capdac_set != chan->channel) {
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7746_REG_CAPDACA,
- chip->capdac[chan->channel][0]);
- if (ret < 0)
- return ret;
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7746_REG_CAPDACB,
- chip->capdac[chan->channel][1]);
- if (ret < 0)
- return ret;
-
- chip->capdac_set = chan->channel;
- }
- break;
- case IIO_VOLTAGE:
- case IIO_TEMP:
- vt_setup = (chan->address & 0xFF) | AD7746_VTSETUP_VTEN;
- cap_setup = chip->cap_setup & ~AD7746_CAPSETUP_CAPEN;
- delay = ad7746_cap_filter_rate_table[(chip->config >> 6) &
- 0x3][1];
- break;
- default:
- return -EINVAL;
- }
-
- if (chip->cap_setup != cap_setup) {
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7746_REG_CAP_SETUP,
- cap_setup);
- if (ret < 0)
- return ret;
-
- chip->cap_setup = cap_setup;
- }
-
- if (chip->vt_setup != vt_setup) {
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7746_REG_VT_SETUP,
- vt_setup);
- if (ret < 0)
- return ret;
-
- chip->vt_setup = vt_setup;
- }
-
- return delay;
-}
-
-static inline ssize_t ad7746_start_calib(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len,
- u8 regval)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
- bool doit;
- int ret, timeout = 10;
-
- ret = strtobool(buf, &doit);
- if (ret < 0)
- return ret;
-
- if (!doit)
- return 0;
-
- mutex_lock(&indio_dev->mlock);
- regval |= chip->config;
- ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval);
- if (ret < 0) {
- mutex_unlock(&indio_dev->mlock);
- return ret;
- }
-
- do {
- msleep(20);
- ret = i2c_smbus_read_byte_data(chip->client, AD7746_REG_CFG);
- if (ret < 0) {
- mutex_unlock(&indio_dev->mlock);
- return ret;
- }
- } while ((ret == regval) && timeout--);
-
- mutex_unlock(&indio_dev->mlock);
-
- return len;
-}
-
-static ssize_t ad7746_start_offset_calib(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- int ret = ad7746_select_channel(indio_dev,
- &ad7746_channels[to_iio_dev_attr(attr)->address]);
- if (ret < 0)
- return ret;
-
- return ad7746_start_calib(dev, attr, buf, len,
- AD7746_CONF_MODE_OFFS_CAL);
-}
-
-static ssize_t ad7746_start_gain_calib(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- int ret = ad7746_select_channel(indio_dev,
- &ad7746_channels[to_iio_dev_attr(attr)->address]);
- if (ret < 0)
- return ret;
-
- return ad7746_start_calib(dev, attr, buf, len,
- AD7746_CONF_MODE_GAIN_CAL);
-}
-
-static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration,
- S_IWUSR, NULL, ad7746_start_offset_calib, CIN1);
-static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration,
- S_IWUSR, NULL, ad7746_start_offset_calib, CIN2);
-static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration,
- S_IWUSR, NULL, ad7746_start_gain_calib, CIN1);
-static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
- S_IWUSR, NULL, ad7746_start_gain_calib, CIN2);
-static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration,
- S_IWUSR, NULL, ad7746_start_gain_calib, VIN);
-
-static ssize_t ad7746_show_cap_filter_rate_setup(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
-
- return sprintf(buf, "%d\n", ad7746_cap_filter_rate_table[
- (chip->config >> 3) & 0x7][0]);
-}
-
-static ssize_t ad7746_store_cap_filter_rate_setup(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
- u8 data;
- int ret, i;
-
- ret = kstrtou8(buf, 10, &data);
- if (ret < 0)
- return ret;
-
- for (i = 0; i < ARRAY_SIZE(ad7746_cap_filter_rate_table); i++)
- if (data >= ad7746_cap_filter_rate_table[i][0])
- break;
-
- if (i >= ARRAY_SIZE(ad7746_cap_filter_rate_table))
- i = ARRAY_SIZE(ad7746_cap_filter_rate_table) - 1;
-
- mutex_lock(&indio_dev->mlock);
- chip->config &= ~AD7746_CONF_CAPFS(0x7);
- chip->config |= AD7746_CONF_CAPFS(i);
- mutex_unlock(&indio_dev->mlock);
-
- return len;
-}
-
-static ssize_t ad7746_show_vt_filter_rate_setup(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
-
- return sprintf(buf, "%d\n", ad7746_vt_filter_rate_table[
- (chip->config >> 6) & 0x3][0]);
-}
-
-static ssize_t ad7746_store_vt_filter_rate_setup(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
- u8 data;
- int ret, i;
-
- ret = kstrtou8(buf, 10, &data);
- if (ret < 0)
- return ret;
-
- for (i = 0; i < ARRAY_SIZE(ad7746_vt_filter_rate_table); i++)
- if (data >= ad7746_vt_filter_rate_table[i][0])
- break;
-
- if (i >= ARRAY_SIZE(ad7746_vt_filter_rate_table))
- i = ARRAY_SIZE(ad7746_vt_filter_rate_table) - 1;
-
- mutex_lock(&indio_dev->mlock);
- chip->config &= ~AD7746_CONF_VTFS(0x3);
- chip->config |= AD7746_CONF_VTFS(i);
- mutex_unlock(&indio_dev->mlock);
-
- return len;
-}
-
-static IIO_DEVICE_ATTR(in_capacitance_sampling_frequency,
- S_IRUGO | S_IWUSR, ad7746_show_cap_filter_rate_setup,
- ad7746_store_cap_filter_rate_setup, 0);
-
-static IIO_DEVICE_ATTR(in_voltage_sampling_frequency,
- S_IRUGO | S_IWUSR, ad7746_show_vt_filter_rate_setup,
- ad7746_store_vt_filter_rate_setup, 0);
-
-static IIO_CONST_ATTR(in_voltage_sampling_frequency_available, "50 31 16 8");
-static IIO_CONST_ATTR(in_capacitance_sampling_frequency_available,
- "91 84 50 26 16 13 11 9");
-
-static struct attribute *ad7746_attributes[] = {
- &iio_dev_attr_in_capacitance_sampling_frequency.dev_attr.attr,
- &iio_dev_attr_in_voltage_sampling_frequency.dev_attr.attr,
- &iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
- &iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
- &iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
- &iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr,
- &iio_dev_attr_in_voltage0_calibscale_calibration.dev_attr.attr,
- &iio_const_attr_in_voltage_sampling_frequency_available.dev_attr.attr,
- &iio_const_attr_in_capacitance_sampling_frequency_available.
- dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7746_attribute_group = {
- .attrs = ad7746_attributes,
-};
-
-static int ad7746_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val,
- int val2,
- long mask)
-{
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
- int ret, reg;
-
- mutex_lock(&indio_dev->mlock);
-
- switch (mask) {
- case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
- if (val != 1) {
- ret = -EINVAL;
- goto out;
- }
-
- val = (val2 * 1024) / 15625;
-
- switch (chan->type) {
- case IIO_CAPACITANCE:
- reg = AD7746_REG_CAP_GAINH;
- break;
- case IIO_VOLTAGE:
- reg = AD7746_REG_VOLT_GAINH;
- break;
- default:
- ret = -EINVAL;
- goto out;
- }
-
- ret = i2c_smbus_write_word_data(chip->client, reg, swab16(val));
- if (ret < 0)
- goto out;
-
- ret = 0;
- break;
- case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED):
- if ((val < 0) | (val > 0xFFFF)) {
- ret = -EINVAL;
- goto out;
- }
- ret = i2c_smbus_write_word_data(chip->client,
- AD7746_REG_CAP_OFFH, swab16(val));
- if (ret < 0)
- goto out;
-
- ret = 0;
- break;
- case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
- if ((val < 0) | (val > 43008000)) { /* 21pF */
- ret = -EINVAL;
- goto out;
- }
-
- /* CAPDAC Scale = 21pF_typ / 127
- * CIN Scale = 8.192pF / 2^24
- * Offset Scale = CAPDAC Scale / CIN Scale = 338646
- * */
-
- val /= 338646;
-
- chip->capdac[chan->channel][chan->differential] = (val > 0 ?
- AD7746_CAPDAC_DACP(val) | AD7746_CAPDAC_DACEN : 0);
-
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7746_REG_CAPDACA,
- chip->capdac[chan->channel][0]);
- if (ret < 0)
- goto out;
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7746_REG_CAPDACB,
- chip->capdac[chan->channel][1]);
- if (ret < 0)
- goto out;
-
- chip->capdac_set = chan->channel;
-
- ret = 0;
- break;
- default:
- ret = -EINVAL;
- }
-
-out:
- mutex_unlock(&indio_dev->mlock);
- return ret;
-}
-
-static int ad7746_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val, int *val2,
- long mask)
-{
- struct ad7746_chip_info *chip = iio_priv(indio_dev);
- int ret, delay;
- u8 regval, reg;
-
- union {
- u32 d32;
- u8 d8[4];
- } data;
-
- mutex_lock(&indio_dev->mlock);
-
- switch (mask) {
- case 0:
- ret = ad7746_select_channel(indio_dev, chan);
- if (ret < 0)
- goto out;
- delay = ret;
-
- regval = chip->config | AD7746_CONF_MODE_SINGLE_CONV;
- ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG,
- regval);
- if (ret < 0)
- goto out;
-
- msleep(delay);
- /* Now read the actual register */
-
- ret = i2c_smbus_read_i2c_block_data(chip->client,
- chan->address >> 8, 3, &data.d8[1]);
-
- if (ret < 0)
- goto out;
-
- *val = (be32_to_cpu(data.d32) & 0xFFFFFF) - 0x800000;
-
- switch (chan->type) {
- case IIO_TEMP:
- /* temperature in milli degrees Celsius
- * T = ((*val / 2048) - 4096) * 1000
- */
- *val = (*val * 125) / 256;
- break;
- case IIO_VOLTAGE:
- if (chan->channel == 1) /* supply_raw*/
- *val = *val * 6;
- break;
- default:
- break;
- }
-
- ret = IIO_VAL_INT;
- break;
- case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
- switch (chan->type) {
- case IIO_CAPACITANCE:
- reg = AD7746_REG_CAP_GAINH;
- break;
- case IIO_VOLTAGE:
- reg = AD7746_REG_VOLT_GAINH;
- break;
- default:
- ret = -EINVAL;
- goto out;
- }
-
- ret = i2c_smbus_read_word_data(chip->client, reg);
- if (ret < 0)
- goto out;
- /* 1 + gain_val / 2^16 */
- *val = 1;
- *val2 = (15625 * swab16(ret)) / 1024;
-
- ret = IIO_VAL_INT_PLUS_MICRO;
- break;
- case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED):
- ret = i2c_smbus_read_word_data(chip->client,
- AD7746_REG_CAP_OFFH);
- if (ret < 0)
- goto out;
- *val = swab16(ret);
-
- ret = IIO_VAL_INT;
- break;
- case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
- *val = AD7746_CAPDAC_DACP(chip->capdac[chan->channel]
- [chan->differential]) * 338646;
-
- ret = IIO_VAL_INT;
- break;
- case (1 << IIO_CHAN_INFO_SCALE_SHARED):
- switch (chan->type) {
- case IIO_CAPACITANCE:
- /* 8.192pf / 2^24 */
- *val2 = 488;
- *val = 0;
- break;
- case IIO_VOLTAGE:
- /* 1170mV / 2^23 */
- *val2 = 139475;
- *val = 0;
- break;
- default:
- ret = -EINVAL;
- goto out;
- }
-
- ret = IIO_VAL_INT_PLUS_NANO;
- break;
- default:
- ret = -EINVAL;
- };
-out:
- mutex_unlock(&indio_dev->mlock);
- return ret;
-}
-
-static const struct iio_info ad7746_info = {
- .attrs = &ad7746_attribute_group,
- .read_raw = &ad7746_read_raw,
- .write_raw = &ad7746_write_raw,
- .driver_module = THIS_MODULE,
-};
-
-/*
- * device probe and remove
- */
-
-static int __devinit ad7746_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct ad7746_platform_data *pdata = client->dev.platform_data;
- struct ad7746_chip_info *chip;
- struct iio_dev *indio_dev;
- int ret = 0;
- unsigned char regval = 0;
-
- indio_dev = iio_allocate_device(sizeof(*chip));
- if (indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- chip = iio_priv(indio_dev);
- /* this is only used for device removal purposes */
- i2c_set_clientdata(client, indio_dev);
-
- chip->client = client;
- chip->capdac_set = -1;
-
- /* Establish that the iio_dev is a child of the i2c device */
- indio_dev->name = id->name;
- indio_dev->dev.parent = &client->dev;
- indio_dev->info = &ad7746_info;
- indio_dev->channels = ad7746_channels;
- if (id->driver_data == 7746)
- indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
- else
- indio_dev->num_channels = ARRAY_SIZE(ad7746_channels) - 2;
- indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
- indio_dev->modes = INDIO_DIRECT_MODE;
-
- if (pdata) {
- if (pdata->exca_en) {
- if (pdata->exca_inv_en)
- regval |= AD7746_EXCSETUP_NEXCA;
- else
- regval |= AD7746_EXCSETUP_EXCA;
- }
-
- if (pdata->excb_en) {
- if (pdata->excb_inv_en)
- regval |= AD7746_EXCSETUP_NEXCB;
- else
- regval |= AD7746_EXCSETUP_EXCB;
- }
-
- regval |= AD7746_EXCSETUP_EXCLVL(pdata->exclvl);
- } else {
- dev_warn(&client->dev, "No platform data? using default\n");
- regval = AD7746_EXCSETUP_EXCA | AD7746_EXCSETUP_EXCB |
- AD7746_EXCSETUP_EXCLVL(3);
- }
-
- ret = i2c_smbus_write_byte_data(chip->client,
- AD7746_REG_EXC_SETUP, regval);
- if (ret < 0)
- goto error_free_dev;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_free_dev;
-
- dev_info(&client->dev, "%s capacitive sensor registered\n", id->name);
-
- return 0;
-
-error_free_dev:
- iio_free_device(indio_dev);
-error_ret:
- return ret;
-}
-
-static int __devexit ad7746_remove(struct i2c_client *client)
-{
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
- iio_device_unregister(indio_dev);
- iio_free_device(indio_dev);
-
- return 0;
-}
-
-static const struct i2c_device_id ad7746_id[] = {
- { "ad7745", 7745 },
- { "ad7746", 7746 },
- { "ad7747", 7747 },
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ad7746_id);
-
-static struct i2c_driver ad7746_driver = {
- .driver = {
- .name = KBUILD_MODNAME,
- },
- .probe = ad7746_probe,
- .remove = __devexit_p(ad7746_remove),
- .id_table = ad7746_id,
-};
-
-static __init int ad7746_init(void)
-{
- return i2c_add_driver(&ad7746_driver);
-}
-
-static __exit void ad7746_exit(void)
-{
- i2c_del_driver(&ad7746_driver);
-}
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD7746/5/7 capacitive sensor driver");
-MODULE_LICENSE("GPL v2");
-
-module_init(ad7746_init);
-module_exit(ad7746_exit);
+++ /dev/null
-/*
- * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#ifndef IIO_CDC_AD7746_H_
-#define IIO_CDC_AD7746_H_
-
-/*
- * TODO: struct ad7746_platform_data needs to go into include/linux/iio
- */
-
-#define AD7466_EXCLVL_0 0 /* +-VDD/8 */
-#define AD7466_EXCLVL_1 1 /* +-VDD/4 */
-#define AD7466_EXCLVL_2 2 /* +-VDD * 3/8 */
-#define AD7466_EXCLVL_3 3 /* +-VDD/2 */
-
-struct ad7746_platform_data {
- unsigned char exclvl; /*Excitation Voltage Level */
- bool exca_en; /* enables EXCA pin as the excitation output */
- bool exca_inv_en; /* enables /EXCA pin as the excitation output */
- bool excb_en; /* enables EXCB pin as the excitation output */
- bool excb_inv_en; /* enables /EXCB pin as the excitation output */
-};
-
-#endif /* IIO_CDC_AD7746_H_ */
--- /dev/null
+#
+# CDC drivers
+#
+menu "Capacitance to digital converters"
+
+config AD7150
+ tristate "Analog Devices ad7150/1/6 capacitive sensor driver"
+ depends on I2C
+ help
+ Say yes here to build support for Analog Devices capacitive sensors.
+ (ad7150, ad7151, ad7156) Provides direct access via sysfs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7150.
+
+config AD7152
+ tristate "Analog Devices ad7152/3 capacitive sensor driver"
+ depends on I2C
+ help
+ Say yes here to build support for Analog Devices capacitive sensors.
+ (ad7152, ad7153) Provides direct access via sysfs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7152.
+
+config AD7746
+ tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"
+ depends on I2C
+ help
+ Say yes here to build support for Analog Devices capacitive sensors.
+ (AD7745, AD7746, AD7747) Provides direct access via sysfs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7746.
+
+endmenu
--- /dev/null
+#
+# Makefile for industrial I/O DAC drivers
+#
+
+obj-$(CONFIG_AD7150) += ad7150.o
+obj-$(CONFIG_AD7152) += ad7152.o
+obj-$(CONFIG_AD7746) += ad7746.o
--- /dev/null
+/*
+ * AD7150 capacitive sensor driver supporting AD7150/1/6
+ *
+ * Copyright 2010-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+/*
+ * AD7150 registers definition
+ */
+
+#define AD7150_STATUS 0
+#define AD7150_STATUS_OUT1 (1 << 3)
+#define AD7150_STATUS_OUT2 (1 << 5)
+#define AD7150_CH1_DATA_HIGH 1
+#define AD7150_CH2_DATA_HIGH 3
+#define AD7150_CH1_AVG_HIGH 5
+#define AD7150_CH2_AVG_HIGH 7
+#define AD7150_CH1_SENSITIVITY 9
+#define AD7150_CH1_THR_HOLD_H 9
+#define AD7150_CH1_TIMEOUT 10
+#define AD7150_CH1_SETUP 11
+#define AD7150_CH2_SENSITIVITY 12
+#define AD7150_CH2_THR_HOLD_H 12
+#define AD7150_CH2_TIMEOUT 13
+#define AD7150_CH2_SETUP 14
+#define AD7150_CFG 15
+#define AD7150_CFG_FIX (1 << 7)
+#define AD7150_PD_TIMER 16
+#define AD7150_CH1_CAPDAC 17
+#define AD7150_CH2_CAPDAC 18
+#define AD7150_SN3 19
+#define AD7150_SN2 20
+#define AD7150_SN1 21
+#define AD7150_SN0 22
+#define AD7150_ID 23
+
+/**
+ * struct ad7150_chip_info - instance specific chip data
+ * @client: i2c client for this device
+ * @current_event: device always has one type of event enabled.
+ * This element stores the event code of the current one.
+ * @threshold: thresholds for simple capacitance value events
+ * @thresh_sensitivity: threshold for simple capacitance offset
+ * from 'average' value.
+ * @mag_sensitity: threshold for magnitude of capacitance offset from
+ * from 'average' value.
+ * @thresh_timeout: a timeout, in samples from the moment an
+ * adaptive threshold event occurs to when the average
+ * value jumps to current value.
+ * @mag_timeout: a timeout, in sample from the moment an
+ * adaptive magnitude event occurs to when the average
+ * value jumps to the current value.
+ * @old_state: store state from previous event, allowing confirmation
+ * of new condition.
+ * @conversion_mode: the current conversion mode.
+ * @state_lock: ensure consistent state of this structure wrt the
+ * hardware.
+ */
+struct ad7150_chip_info {
+ struct i2c_client *client;
+ u64 current_event;
+ u16 threshold[2][2];
+ u8 thresh_sensitivity[2][2];
+ u8 mag_sensitivity[2][2];
+ u8 thresh_timeout[2][2];
+ u8 mag_timeout[2][2];
+ int old_state;
+ char *conversion_mode;
+ struct mutex state_lock;
+};
+
+/*
+ * sysfs nodes
+ */
+
+static const u8 ad7150_addresses[][6] = {
+ { AD7150_CH1_DATA_HIGH, AD7150_CH1_AVG_HIGH,
+ AD7150_CH1_SETUP, AD7150_CH1_THR_HOLD_H,
+ AD7150_CH1_SENSITIVITY, AD7150_CH1_TIMEOUT },
+ { AD7150_CH2_DATA_HIGH, AD7150_CH2_AVG_HIGH,
+ AD7150_CH2_SETUP, AD7150_CH2_THR_HOLD_H,
+ AD7150_CH2_SENSITIVITY, AD7150_CH2_TIMEOUT },
+};
+
+static int ad7150_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ int ret;
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+
+ switch (mask) {
+ case 0:
+ ret = i2c_smbus_read_word_data(chip->client,
+ ad7150_addresses[chan->channel][0]);
+ if (ret < 0)
+ return ret;
+ *val = swab16(ret);
+ return IIO_VAL_INT;
+ case (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE):
+ ret = i2c_smbus_read_word_data(chip->client,
+ ad7150_addresses[chan->channel][1]);
+ if (ret < 0)
+ return ret;
+ *val = swab16(ret);
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad7150_read_event_config(struct iio_dev *indio_dev, u64 event_code)
+{
+ int ret;
+ u8 threshtype;
+ bool adaptive;
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+ IIO_EV_DIR_RISING);
+
+ ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
+ if (ret < 0)
+ return ret;
+
+ threshtype = (ret >> 5) & 0x03;
+ adaptive = !!(ret & 0x80);
+
+ switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ if (rising)
+ return adaptive && (threshtype == 0x1);
+ else
+ return adaptive && (threshtype == 0x0);
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ if (rising)
+ return adaptive && (threshtype == 0x3);
+ else
+ return adaptive && (threshtype == 0x2);
+
+ case IIO_EV_TYPE_THRESH:
+ if (rising)
+ return !adaptive && (threshtype == 0x1);
+ else
+ return !adaptive && (threshtype == 0x0);
+ };
+ return -EINVAL;
+}
+
+/* lock should be held */
+static int ad7150_write_event_params(struct iio_dev *indio_dev, u64 event_code)
+{
+ int ret;
+ u16 value;
+ u8 sens, timeout;
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
+ int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+ IIO_EV_DIR_RISING);
+
+ if (event_code != chip->current_event)
+ return 0;
+
+ switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+ /* Note completely different from the adaptive versions */
+ case IIO_EV_TYPE_THRESH:
+ value = chip->threshold[rising][chan];
+ ret = i2c_smbus_write_word_data(chip->client,
+ ad7150_addresses[chan][3],
+ swab16(value));
+ if (ret < 0)
+ return ret;
+ return 0;
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ sens = chip->mag_sensitivity[rising][chan];
+ timeout = chip->mag_timeout[rising][chan];
+ break;
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ sens = chip->thresh_sensitivity[rising][chan];
+ timeout = chip->thresh_timeout[rising][chan];
+ break;
+ default:
+ return -EINVAL;
+ };
+ ret = i2c_smbus_write_byte_data(chip->client,
+ ad7150_addresses[chan][4],
+ sens);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ ad7150_addresses[chan][5],
+ timeout);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int ad7150_write_event_config(struct iio_dev *indio_dev,
+ u64 event_code, int state)
+{
+ u8 thresh_type, cfg, adaptive;
+ int ret;
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+ IIO_EV_DIR_RISING);
+
+ /* Something must always be turned on */
+ if (state == 0)
+ return -EINVAL;
+
+ if (event_code == chip->current_event)
+ return 0;
+ mutex_lock(&chip->state_lock);
+ ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
+ if (ret < 0)
+ goto error_ret;
+
+ cfg = ret & ~((0x03 << 5) | (0x1 << 7));
+
+ switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ adaptive = 1;
+ if (rising)
+ thresh_type = 0x1;
+ else
+ thresh_type = 0x0;
+ break;
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ adaptive = 1;
+ if (rising)
+ thresh_type = 0x3;
+ else
+ thresh_type = 0x2;
+ break;
+ case IIO_EV_TYPE_THRESH:
+ adaptive = 0;
+ if (rising)
+ thresh_type = 0x1;
+ else
+ thresh_type = 0x0;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_ret;
+ };
+
+ cfg |= (!adaptive << 7) | (thresh_type << 5);
+
+ ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg);
+ if (ret < 0)
+ goto error_ret;
+
+ chip->current_event = event_code;
+
+ /* update control attributes */
+ ret = ad7150_write_event_params(indio_dev, event_code);
+error_ret:
+ mutex_unlock(&chip->state_lock);
+
+ return 0;
+}
+
+static int ad7150_read_event_value(struct iio_dev *indio_dev,
+ u64 event_code,
+ int *val)
+{
+ int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+ IIO_EV_DIR_RISING);
+
+ /* Complex register sharing going on here */
+ switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ *val = chip->mag_sensitivity[rising][chan];
+ return 0;
+
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ *val = chip->thresh_sensitivity[rising][chan];
+ return 0;
+
+ case IIO_EV_TYPE_THRESH:
+ *val = chip->threshold[rising][chan];
+ return 0;
+
+ default:
+ return -EINVAL;
+ };
+}
+
+static int ad7150_write_event_value(struct iio_dev *indio_dev,
+ u64 event_code,
+ int val)
+{
+ int ret;
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ int chan = IIO_EVENT_CODE_EXTRACT_NUM(event_code);
+ int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
+ IIO_EV_DIR_RISING);
+
+ mutex_lock(&chip->state_lock);
+ switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ chip->mag_sensitivity[rising][chan] = val;
+ break;
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ chip->thresh_sensitivity[rising][chan] = val;
+ break;
+ case IIO_EV_TYPE_THRESH:
+ chip->threshold[rising][chan] = val;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_ret;
+ };
+
+ /* write back if active */
+ ret = ad7150_write_event_params(indio_dev, event_code);
+
+error_ret:
+ mutex_unlock(&chip->state_lock);
+ return ret;
+}
+
+static ssize_t ad7150_show_timeout(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ u8 value;
+
+ /* use the event code for consistency reasons */
+ int chan = IIO_EVENT_CODE_EXTRACT_NUM(this_attr->address);
+ int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
+ == IIO_EV_DIR_RISING);
+
+ switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ value = chip->mag_timeout[rising][chan];
+ break;
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ value = chip->thresh_timeout[rising][chan];
+ break;
+ default:
+ return -EINVAL;
+ };
+
+ return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t ad7150_store_timeout(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int chan = IIO_EVENT_CODE_EXTRACT_NUM(this_attr->address);
+ int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address) ==
+ IIO_EV_DIR_RISING);
+ u8 data;
+ int ret;
+
+ ret = kstrtou8(buf, 10, &data);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&chip->state_lock);
+ switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ chip->mag_timeout[rising][chan] = data;
+ break;
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ chip->thresh_timeout[rising][chan] = data;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_ret;
+ };
+
+ ret = ad7150_write_event_params(indio_dev, this_attr->address);
+error_ret:
+ mutex_unlock(&chip->state_lock);
+
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+#define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir) \
+ IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \
+ S_IRUGO | S_IWUSR, \
+ &ad7150_show_timeout, \
+ &ad7150_store_timeout, \
+ IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, \
+ chan, \
+ IIO_EV_TYPE_##ev_type, \
+ IIO_EV_DIR_##ev_dir))
+static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
+static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
+static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
+static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
+static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
+
+static const struct iio_chan_spec ad7150_channels[] = {
+ {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask = (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE),
+ .event_mask =
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
+ IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
+ IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
+ }, {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask = (1 << IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE),
+ .event_mask =
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
+ IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
+ IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
+ IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
+ },
+};
+
+/*
+ * threshold events
+ */
+
+static irqreturn_t ad7150_event_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct ad7150_chip_info *chip = iio_priv(indio_dev);
+ u8 int_status;
+ s64 timestamp = iio_get_time_ns();
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS);
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ int_status = ret;
+
+ if ((int_status & AD7150_STATUS_OUT1) &&
+ !(chip->old_state & AD7150_STATUS_OUT1))
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+ 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING),
+ timestamp);
+ else if ((!(int_status & AD7150_STATUS_OUT1)) &&
+ (chip->old_state & AD7150_STATUS_OUT1))
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+ 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING),
+ timestamp);
+
+ if ((int_status & AD7150_STATUS_OUT2) &&
+ !(chip->old_state & AD7150_STATUS_OUT2))
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+ 1,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING),
+ timestamp);
+ else if ((!(int_status & AD7150_STATUS_OUT2)) &&
+ (chip->old_state & AD7150_STATUS_OUT2))
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+ 1,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING),
+ timestamp);
+ /* store the status to avoid repushing same events */
+ chip->old_state = int_status;
+
+ return IRQ_HANDLED;
+}
+
+/* Timeouts not currently handled by core */
+static struct attribute *ad7150_event_attributes[] = {
+ &iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout
+ .dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout
+ .dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout
+ .dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout
+ .dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout
+ .dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout
+ .dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout
+ .dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout
+ .dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7150_event_attribute_group = {
+ .attrs = ad7150_event_attributes,
+ .name = "events",
+};
+
+static const struct iio_info ad7150_info = {
+ .event_attrs = &ad7150_event_attribute_group,
+ .driver_module = THIS_MODULE,
+ .read_raw = &ad7150_read_raw,
+ .read_event_config = &ad7150_read_event_config,
+ .write_event_config = &ad7150_write_event_config,
+ .read_event_value = &ad7150_read_event_value,
+ .write_event_value = &ad7150_write_event_value,
+};
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit ad7150_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct ad7150_chip_info *chip;
+ struct iio_dev *indio_dev;
+
+ indio_dev = iio_allocate_device(sizeof(*chip));
+ if (indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ chip = iio_priv(indio_dev);
+ mutex_init(&chip->state_lock);
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, indio_dev);
+
+ chip->client = client;
+
+ indio_dev->name = id->name;
+ indio_dev->channels = ad7150_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
+ /* Establish that the iio_dev is a child of the i2c device */
+ indio_dev->dev.parent = &client->dev;
+
+ indio_dev->info = &ad7150_info;
+
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ if (client->irq) {
+ ret = request_threaded_irq(client->irq,
+ NULL,
+ &ad7150_event_handler,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ "ad7150_irq1",
+ indio_dev);
+ if (ret)
+ goto error_free_dev;
+ }
+
+ if (client->dev.platform_data) {
+ ret = request_threaded_irq(*(unsigned int *)
+ client->dev.platform_data,
+ NULL,
+ &ad7150_event_handler,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ "ad7150_irq2",
+ indio_dev);
+ if (ret)
+ goto error_free_irq;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_free_irq2;
+
+ dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n",
+ id->name, client->irq);
+
+ return 0;
+error_free_irq2:
+ if (client->dev.platform_data)
+ free_irq(*(unsigned int *)client->dev.platform_data,
+ indio_dev);
+error_free_irq:
+ if (client->irq)
+ free_irq(client->irq, indio_dev);
+error_free_dev:
+ iio_free_device(indio_dev);
+error_ret:
+ return ret;
+}
+
+static int __devexit ad7150_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+ if (client->irq)
+ free_irq(client->irq, indio_dev);
+
+ if (client->dev.platform_data)
+ free_irq(*(unsigned int *)client->dev.platform_data, indio_dev);
+
+ iio_free_device(indio_dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id ad7150_id[] = {
+ { "ad7150", 0 },
+ { "ad7151", 0 },
+ { "ad7156", 0 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad7150_id);
+
+static struct i2c_driver ad7150_driver = {
+ .driver = {
+ .name = "ad7150",
+ },
+ .probe = ad7150_probe,
+ .remove = __devexit_p(ad7150_remove),
+ .id_table = ad7150_id,
+};
+
+static __init int ad7150_init(void)
+{
+ return i2c_add_driver(&ad7150_driver);
+}
+
+static __exit void ad7150_exit(void)
+{
+ i2c_del_driver(&ad7150_driver);
+}
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(ad7150_init);
+module_exit(ad7150_exit);
--- /dev/null
+/*
+ * AD7152 capacitive sensor driver supporting AD7152/3
+ *
+ * Copyright 2010-2011a Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+/*
+ * TODO: Check compliance of calibbias with abi (units)
+ */
+/*
+ * AD7152 registers definition
+ */
+
+#define AD7152_REG_STATUS 0
+#define AD7152_REG_CH1_DATA_HIGH 1
+#define AD7152_REG_CH2_DATA_HIGH 3
+#define AD7152_REG_CH1_OFFS_HIGH 5
+#define AD7152_REG_CH2_OFFS_HIGH 7
+#define AD7152_REG_CH1_GAIN_HIGH 9
+#define AD7152_REG_CH1_SETUP 11
+#define AD7152_REG_CH2_GAIN_HIGH 12
+#define AD7152_REG_CH2_SETUP 14
+#define AD7152_REG_CFG 15
+#define AD7152_REG_RESEVERD 16
+#define AD7152_REG_CAPDAC_POS 17
+#define AD7152_REG_CAPDAC_NEG 18
+#define AD7152_REG_CFG2 26
+
+/* Status Register Bit Designations (AD7152_REG_STATUS) */
+#define AD7152_STATUS_RDY1 (1 << 0)
+#define AD7152_STATUS_RDY2 (1 << 1)
+#define AD7152_STATUS_C1C2 (1 << 2)
+#define AD7152_STATUS_PWDN (1 << 7)
+
+/* Setup Register Bit Designations (AD7152_REG_CHx_SETUP) */
+#define AD7152_SETUP_CAPDIFF (1 << 5)
+#define AD7152_SETUP_RANGE_2pF (0 << 6)
+#define AD7152_SETUP_RANGE_0_5pF (1 << 6)
+#define AD7152_SETUP_RANGE_1pF (2 << 6)
+#define AD7152_SETUP_RANGE_4pF (3 << 6)
+#define AD7152_SETUP_RANGE(x) ((x) << 6)
+
+/* Config Register Bit Designations (AD7152_REG_CFG) */
+#define AD7152_CONF_CH2EN (1 << 3)
+#define AD7152_CONF_CH1EN (1 << 4)
+#define AD7152_CONF_MODE_IDLE (0 << 0)
+#define AD7152_CONF_MODE_CONT_CONV (1 << 0)
+#define AD7152_CONF_MODE_SINGLE_CONV (2 << 0)
+#define AD7152_CONF_MODE_OFFS_CAL (5 << 0)
+#define AD7152_CONF_MODE_GAIN_CAL (6 << 0)
+
+/* Capdac Register Bit Designations (AD7152_REG_CAPDAC_XXX) */
+#define AD7152_CAPDAC_DACEN (1 << 7)
+#define AD7152_CAPDAC_DACP(x) ((x) & 0x1F)
+
+/* CFG2 Register Bit Designations (AD7152_REG_CFG2) */
+#define AD7152_CFG2_OSR(x) (((x) & 0x3) << 4)
+
+enum {
+ AD7152_DATA,
+ AD7152_OFFS,
+ AD7152_GAIN,
+ AD7152_SETUP
+};
+
+/*
+ * struct ad7152_chip_info - chip specifc information
+ */
+
+struct ad7152_chip_info {
+ struct i2c_client *client;
+ /*
+ * Capacitive channel digital filter setup;
+ * conversion time/update rate setup per channel
+ */
+ u8 filter_rate_setup;
+ u8 setup[2];
+};
+
+static inline ssize_t ad7152_start_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len,
+ u8 regval)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7152_chip_info *chip = iio_priv(indio_dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ bool doit;
+ int ret, timeout = 10;
+
+ ret = strtobool(buf, &doit);
+ if (ret < 0)
+ return ret;
+
+ if (!doit)
+ return 0;
+
+ if (this_attr->address == 0)
+ regval |= AD7152_CONF_CH1EN;
+ else
+ regval |= AD7152_CONF_CH2EN;
+
+ mutex_lock(&indio_dev->mlock);
+ ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG, regval);
+ if (ret < 0) {
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ }
+
+ do {
+ mdelay(20);
+ ret = i2c_smbus_read_byte_data(chip->client, AD7152_REG_CFG);
+ if (ret < 0) {
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ }
+ } while ((ret == regval) && timeout--);
+
+ mutex_unlock(&indio_dev->mlock);
+ return len;
+}
+static ssize_t ad7152_start_offset_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return ad7152_start_calib(dev, attr, buf, len,
+ AD7152_CONF_MODE_OFFS_CAL);
+}
+static ssize_t ad7152_start_gain_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return ad7152_start_calib(dev, attr, buf, len,
+ AD7152_CONF_MODE_GAIN_CAL);
+}
+
+static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration,
+ S_IWUSR, NULL, ad7152_start_offset_calib, 0);
+static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration,
+ S_IWUSR, NULL, ad7152_start_offset_calib, 1);
+static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration,
+ S_IWUSR, NULL, ad7152_start_gain_calib, 0);
+static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
+ S_IWUSR, NULL, ad7152_start_gain_calib, 1);
+
+/* Values are Update Rate (Hz), Conversion Time (ms) + 1*/
+static const unsigned char ad7152_filter_rate_table[][2] = {
+ {200, 5 + 1}, {50, 20 + 1}, {20, 50 + 1}, {17, 60 + 1},
+};
+
+static ssize_t ad7152_show_filter_rate_setup(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7152_chip_info *chip = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n",
+ ad7152_filter_rate_table[chip->filter_rate_setup][0]);
+}
+
+static ssize_t ad7152_store_filter_rate_setup(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7152_chip_info *chip = iio_priv(indio_dev);
+ u8 data;
+ int ret, i;
+
+ ret = kstrtou8(buf, 10, &data);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(ad7152_filter_rate_table); i++)
+ if (data >= ad7152_filter_rate_table[i][0])
+ break;
+
+ if (i >= ARRAY_SIZE(ad7152_filter_rate_table))
+ i = ARRAY_SIZE(ad7152_filter_rate_table) - 1;
+
+ mutex_lock(&indio_dev->mlock);
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7152_REG_CFG2, AD7152_CFG2_OSR(i));
+ if (ret < 0) {
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ }
+
+ chip->filter_rate_setup = i;
+ mutex_unlock(&indio_dev->mlock);
+
+ return len;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
+ ad7152_show_filter_rate_setup,
+ ad7152_store_filter_rate_setup);
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("200 50 20 17");
+
+static IIO_CONST_ATTR(in_capacitance_scale_available,
+ "0.000061050 0.000030525 0.000015263 0.000007631");
+
+static struct attribute *ad7152_attributes[] = {
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
+ &iio_const_attr_in_capacitance_scale_available.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7152_attribute_group = {
+ .attrs = ad7152_attributes,
+};
+
+static const u8 ad7152_addresses[][4] = {
+ { AD7152_REG_CH1_DATA_HIGH, AD7152_REG_CH1_OFFS_HIGH,
+ AD7152_REG_CH1_GAIN_HIGH, AD7152_REG_CH1_SETUP },
+ { AD7152_REG_CH2_DATA_HIGH, AD7152_REG_CH2_OFFS_HIGH,
+ AD7152_REG_CH2_GAIN_HIGH, AD7152_REG_CH2_SETUP },
+};
+
+/* Values are nano relative to pf base. */
+static const int ad7152_scale_table[] = {
+ 30525, 7631, 15263, 61050
+};
+
+static int ad7152_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct ad7152_chip_info *chip = iio_priv(indio_dev);
+ int ret, i;
+
+ mutex_lock(&indio_dev->mlock);
+
+ switch (mask) {
+ case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
+ if (val != 1) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ val = (val2 * 1024) / 15625;
+
+ ret = i2c_smbus_write_word_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_GAIN],
+ swab16(val));
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ break;
+
+ case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
+ if ((val < 0) | (val > 0xFFFF)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = i2c_smbus_write_word_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_OFFS],
+ swab16(val));
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ break;
+ case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
+ if (val != 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+ for (i = 0; i < ARRAY_SIZE(ad7152_scale_table); i++)
+ if (val2 == ad7152_scale_table[i])
+ break;
+
+ chip->setup[chan->channel] &= ~AD7152_SETUP_RANGE_4pF;
+ chip->setup[chan->channel] |= AD7152_SETUP_RANGE(i);
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_SETUP],
+ chip->setup[chan->channel]);
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+out:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+static int ad7152_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2,
+ long mask)
+{
+ struct ad7152_chip_info *chip = iio_priv(indio_dev);
+ int ret;
+ u8 regval = 0;
+
+ mutex_lock(&indio_dev->mlock);
+
+ switch (mask) {
+ case 0:
+ /* First set whether in differential mode */
+
+ regval = chip->setup[chan->channel];
+
+ if (chan->differential)
+ chip->setup[chan->channel] |= AD7152_SETUP_CAPDIFF;
+ else
+ chip->setup[chan->channel] &= ~AD7152_SETUP_CAPDIFF;
+
+ if (regval != chip->setup[chan->channel]) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_SETUP],
+ chip->setup[chan->channel]);
+ if (ret < 0)
+ goto out;
+ }
+ /* Make sure the channel is enabled */
+ if (chan->channel == 0)
+ regval = AD7152_CONF_CH1EN;
+ else
+ regval = AD7152_CONF_CH2EN;
+
+ /* Trigger a single read */
+ regval |= AD7152_CONF_MODE_SINGLE_CONV;
+ ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG,
+ regval);
+ if (ret < 0)
+ goto out;
+
+ msleep(ad7152_filter_rate_table[chip->filter_rate_setup][1]);
+ /* Now read the actual register */
+ ret = i2c_smbus_read_word_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_DATA]);
+ if (ret < 0)
+ goto out;
+ *val = swab16(ret);
+
+ if (chan->differential)
+ *val -= 0x8000;
+
+ ret = IIO_VAL_INT;
+ break;
+ case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
+
+ ret = i2c_smbus_read_word_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_GAIN]);
+ if (ret < 0)
+ goto out;
+ /* 1 + gain_val / 2^16 */
+ *val = 1;
+ *val2 = (15625 * swab16(ret)) / 1024;
+
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
+ ret = i2c_smbus_read_word_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_OFFS]);
+ if (ret < 0)
+ goto out;
+ *val = swab16(ret);
+
+ ret = IIO_VAL_INT;
+ break;
+ case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
+ ret = i2c_smbus_read_byte_data(chip->client,
+ ad7152_addresses[chan->channel][AD7152_SETUP]);
+ if (ret < 0)
+ goto out;
+ *val = 0;
+ *val2 = ad7152_scale_table[ret >> 6];
+
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ default:
+ ret = -EINVAL;
+ };
+out:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+
+static int ad7152_write_raw_get_fmt(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ long mask)
+{
+ switch (mask) {
+ case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
+ return IIO_VAL_INT_PLUS_NANO;
+ default:
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+}
+
+static const struct iio_info ad7152_info = {
+ .attrs = &ad7152_attribute_group,
+ .read_raw = &ad7152_read_raw,
+ .write_raw = &ad7152_write_raw,
+ .write_raw_get_fmt = &ad7152_write_raw_get_fmt,
+ .driver_module = THIS_MODULE,
+};
+
+static const struct iio_chan_spec ad7152_channels[] = {
+ {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
+ }, {
+ .type = IIO_CAPACITANCE,
+ .differential = 1,
+ .indexed = 1,
+ .channel = 0,
+ .channel2 = 2,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
+ }, {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
+ }, {
+ .type = IIO_CAPACITANCE,
+ .differential = 1,
+ .indexed = 1,
+ .channel = 1,
+ .channel2 = 3,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
+ }
+};
+/*
+ * device probe and remove
+ */
+
+static int __devinit ad7152_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret = 0;
+ struct ad7152_chip_info *chip;
+ struct iio_dev *indio_dev;
+
+ indio_dev = iio_allocate_device(sizeof(*chip));
+ if (indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ chip = iio_priv(indio_dev);
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, indio_dev);
+
+ chip->client = client;
+
+ /* Establish that the iio_dev is a child of the i2c device */
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &ad7152_info;
+ indio_dev->channels = ad7152_channels;
+ if (id->driver_data == 0)
+ indio_dev->num_channels = ARRAY_SIZE(ad7152_channels);
+ else
+ indio_dev->num_channels = 2;
+ indio_dev->num_channels = ARRAY_SIZE(ad7152_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_free_dev;
+
+ dev_err(&client->dev, "%s capacitive sensor registered\n", id->name);
+
+ return 0;
+
+error_free_dev:
+ iio_free_device(indio_dev);
+error_ret:
+ return ret;
+}
+
+static int __devexit ad7152_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+ iio_free_device(indio_dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id ad7152_id[] = {
+ { "ad7152", 0 },
+ { "ad7153", 1 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad7152_id);
+
+static struct i2c_driver ad7152_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ },
+ .probe = ad7152_probe,
+ .remove = __devexit_p(ad7152_remove),
+ .id_table = ad7152_id,
+};
+
+static __init int ad7152_init(void)
+{
+ return i2c_add_driver(&ad7152_driver);
+}
+
+static __exit void ad7152_exit(void)
+{
+ i2c_del_driver(&ad7152_driver);
+}
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices AD7152/3 capacitive sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(ad7152_init);
+module_exit(ad7152_exit);
--- /dev/null
+/*
+ * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/stat.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+#include "ad7746.h"
+
+/*
+ * AD7746 Register Definition
+ */
+
+#define AD7746_REG_STATUS 0
+#define AD7746_REG_CAP_DATA_HIGH 1
+#define AD7746_REG_CAP_DATA_MID 2
+#define AD7746_REG_CAP_DATA_LOW 3
+#define AD7746_REG_VT_DATA_HIGH 4
+#define AD7746_REG_VT_DATA_MID 5
+#define AD7746_REG_VT_DATA_LOW 6
+#define AD7746_REG_CAP_SETUP 7
+#define AD7746_REG_VT_SETUP 8
+#define AD7746_REG_EXC_SETUP 9
+#define AD7746_REG_CFG 10
+#define AD7746_REG_CAPDACA 11
+#define AD7746_REG_CAPDACB 12
+#define AD7746_REG_CAP_OFFH 13
+#define AD7746_REG_CAP_OFFL 14
+#define AD7746_REG_CAP_GAINH 15
+#define AD7746_REG_CAP_GAINL 16
+#define AD7746_REG_VOLT_GAINH 17
+#define AD7746_REG_VOLT_GAINL 18
+
+/* Status Register Bit Designations (AD7746_REG_STATUS) */
+#define AD7746_STATUS_EXCERR (1 << 3)
+#define AD7746_STATUS_RDY (1 << 2)
+#define AD7746_STATUS_RDYVT (1 << 1)
+#define AD7746_STATUS_RDYCAP (1 << 0)
+
+/* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
+#define AD7746_CAPSETUP_CAPEN (1 << 7)
+#define AD7746_CAPSETUP_CIN2 (1 << 6) /* AD7746 only */
+#define AD7746_CAPSETUP_CAPDIFF (1 << 5)
+#define AD7746_CAPSETUP_CACHOP (1 << 0)
+
+/* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */
+#define AD7746_VTSETUP_VTEN (1 << 7)
+#define AD7746_VTSETUP_VTMD_INT_TEMP (0 << 5)
+#define AD7746_VTSETUP_VTMD_EXT_TEMP (1 << 5)
+#define AD7746_VTSETUP_VTMD_VDD_MON (2 << 5)
+#define AD7746_VTSETUP_VTMD_EXT_VIN (3 << 5)
+#define AD7746_VTSETUP_EXTREF (1 << 4)
+#define AD7746_VTSETUP_VTSHORT (1 << 1)
+#define AD7746_VTSETUP_VTCHOP (1 << 0)
+
+/* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
+#define AD7746_EXCSETUP_CLKCTRL (1 << 7)
+#define AD7746_EXCSETUP_EXCON (1 << 6)
+#define AD7746_EXCSETUP_EXCB (1 << 5)
+#define AD7746_EXCSETUP_NEXCB (1 << 4)
+#define AD7746_EXCSETUP_EXCA (1 << 3)
+#define AD7746_EXCSETUP_NEXCA (1 << 2)
+#define AD7746_EXCSETUP_EXCLVL(x) (((x) & 0x3) << 0)
+
+/* Config Register Bit Designations (AD7746_REG_CFG) */
+#define AD7746_CONF_VTFS(x) ((x) << 6)
+#define AD7746_CONF_CAPFS(x) ((x) << 3)
+#define AD7746_CONF_MODE_IDLE (0 << 0)
+#define AD7746_CONF_MODE_CONT_CONV (1 << 0)
+#define AD7746_CONF_MODE_SINGLE_CONV (2 << 0)
+#define AD7746_CONF_MODE_PWRDN (3 << 0)
+#define AD7746_CONF_MODE_OFFS_CAL (5 << 0)
+#define AD7746_CONF_MODE_GAIN_CAL (6 << 0)
+
+/* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */
+#define AD7746_CAPDAC_DACEN (1 << 7)
+#define AD7746_CAPDAC_DACP(x) ((x) & 0x7F)
+
+/*
+ * struct ad7746_chip_info - chip specifc information
+ */
+
+struct ad7746_chip_info {
+ struct i2c_client *client;
+ /*
+ * Capacitive channel digital filter setup;
+ * conversion time/update rate setup per channel
+ */
+ u8 config;
+ u8 cap_setup;
+ u8 vt_setup;
+ u8 capdac[2][2];
+ s8 capdac_set;
+};
+
+enum ad7746_chan {
+ VIN,
+ VIN_VDD,
+ TEMP_INT,
+ TEMP_EXT,
+ CIN1,
+ CIN1_DIFF,
+ CIN2,
+ CIN2_DIFF,
+};
+
+static const struct iio_chan_spec ad7746_channels[] = {
+ [VIN] = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED),
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_EXT_VIN,
+ },
+ [VIN_VDD] = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 1,
+ .extend_name = "supply",
+ .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED),
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_VDD_MON,
+ },
+ [TEMP_INT] = {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .channel = 0,
+ .processed_val = IIO_PROCESSED,
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_INT_TEMP,
+ },
+ [TEMP_EXT] = {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .channel = 1,
+ .processed_val = IIO_PROCESSED,
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_EXT_TEMP,
+ },
+ [CIN1] = {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
+ (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SHARED),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8,
+ },
+ [CIN1_DIFF] = {
+ .type = IIO_CAPACITANCE,
+ .differential = 1,
+ .indexed = 1,
+ .channel = 0,
+ .channel2 = 2,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
+ (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SHARED),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8 |
+ AD7746_CAPSETUP_CAPDIFF
+ },
+ [CIN2] = {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
+ (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SHARED),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8 |
+ AD7746_CAPSETUP_CIN2,
+ },
+ [CIN2_DIFF] = {
+ .type = IIO_CAPACITANCE,
+ .differential = 1,
+ .indexed = 1,
+ .channel = 1,
+ .channel2 = 3,
+ .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
+ (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
+ (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
+ (1 << IIO_CHAN_INFO_SCALE_SHARED),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8 |
+ AD7746_CAPSETUP_CAPDIFF | AD7746_CAPSETUP_CIN2,
+ }
+};
+
+/* Values are Update Rate (Hz), Conversion Time (ms) + 1*/
+static const unsigned char ad7746_vt_filter_rate_table[][2] = {
+ {50, 20 + 1}, {31, 32 + 1}, {16, 62 + 1}, {8, 122 + 1},
+};
+
+static const unsigned char ad7746_cap_filter_rate_table[][2] = {
+ {91, 11 + 1}, {84, 12 + 1}, {50, 20 + 1}, {26, 38 + 1},
+ {16, 62 + 1}, {13, 77 + 1}, {11, 92 + 1}, {9, 110 + 1},
+};
+
+static int ad7746_select_channel(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ int ret, delay;
+ u8 vt_setup, cap_setup;
+
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ cap_setup = (chan->address & 0xFF) | AD7746_CAPSETUP_CAPEN;
+ vt_setup = chip->vt_setup & ~AD7746_VTSETUP_VTEN;
+ delay = ad7746_cap_filter_rate_table[(chip->config >> 3) &
+ 0x7][1];
+
+ if (chip->capdac_set != chan->channel) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACA,
+ chip->capdac[chan->channel][0]);
+ if (ret < 0)
+ return ret;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACB,
+ chip->capdac[chan->channel][1]);
+ if (ret < 0)
+ return ret;
+
+ chip->capdac_set = chan->channel;
+ }
+ break;
+ case IIO_VOLTAGE:
+ case IIO_TEMP:
+ vt_setup = (chan->address & 0xFF) | AD7746_VTSETUP_VTEN;
+ cap_setup = chip->cap_setup & ~AD7746_CAPSETUP_CAPEN;
+ delay = ad7746_cap_filter_rate_table[(chip->config >> 6) &
+ 0x3][1];
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (chip->cap_setup != cap_setup) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAP_SETUP,
+ cap_setup);
+ if (ret < 0)
+ return ret;
+
+ chip->cap_setup = cap_setup;
+ }
+
+ if (chip->vt_setup != vt_setup) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_VT_SETUP,
+ vt_setup);
+ if (ret < 0)
+ return ret;
+
+ chip->vt_setup = vt_setup;
+ }
+
+ return delay;
+}
+
+static inline ssize_t ad7746_start_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len,
+ u8 regval)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ bool doit;
+ int ret, timeout = 10;
+
+ ret = strtobool(buf, &doit);
+ if (ret < 0)
+ return ret;
+
+ if (!doit)
+ return 0;
+
+ mutex_lock(&indio_dev->mlock);
+ regval |= chip->config;
+ ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval);
+ if (ret < 0) {
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ }
+
+ do {
+ msleep(20);
+ ret = i2c_smbus_read_byte_data(chip->client, AD7746_REG_CFG);
+ if (ret < 0) {
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ }
+ } while ((ret == regval) && timeout--);
+
+ mutex_unlock(&indio_dev->mlock);
+
+ return len;
+}
+
+static ssize_t ad7746_start_offset_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ int ret = ad7746_select_channel(indio_dev,
+ &ad7746_channels[to_iio_dev_attr(attr)->address]);
+ if (ret < 0)
+ return ret;
+
+ return ad7746_start_calib(dev, attr, buf, len,
+ AD7746_CONF_MODE_OFFS_CAL);
+}
+
+static ssize_t ad7746_start_gain_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ int ret = ad7746_select_channel(indio_dev,
+ &ad7746_channels[to_iio_dev_attr(attr)->address]);
+ if (ret < 0)
+ return ret;
+
+ return ad7746_start_calib(dev, attr, buf, len,
+ AD7746_CONF_MODE_GAIN_CAL);
+}
+
+static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration,
+ S_IWUSR, NULL, ad7746_start_offset_calib, CIN1);
+static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration,
+ S_IWUSR, NULL, ad7746_start_offset_calib, CIN2);
+static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration,
+ S_IWUSR, NULL, ad7746_start_gain_calib, CIN1);
+static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
+ S_IWUSR, NULL, ad7746_start_gain_calib, CIN2);
+static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration,
+ S_IWUSR, NULL, ad7746_start_gain_calib, VIN);
+
+static ssize_t ad7746_show_cap_filter_rate_setup(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", ad7746_cap_filter_rate_table[
+ (chip->config >> 3) & 0x7][0]);
+}
+
+static ssize_t ad7746_store_cap_filter_rate_setup(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ u8 data;
+ int ret, i;
+
+ ret = kstrtou8(buf, 10, &data);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(ad7746_cap_filter_rate_table); i++)
+ if (data >= ad7746_cap_filter_rate_table[i][0])
+ break;
+
+ if (i >= ARRAY_SIZE(ad7746_cap_filter_rate_table))
+ i = ARRAY_SIZE(ad7746_cap_filter_rate_table) - 1;
+
+ mutex_lock(&indio_dev->mlock);
+ chip->config &= ~AD7746_CONF_CAPFS(0x7);
+ chip->config |= AD7746_CONF_CAPFS(i);
+ mutex_unlock(&indio_dev->mlock);
+
+ return len;
+}
+
+static ssize_t ad7746_show_vt_filter_rate_setup(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", ad7746_vt_filter_rate_table[
+ (chip->config >> 6) & 0x3][0]);
+}
+
+static ssize_t ad7746_store_vt_filter_rate_setup(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ u8 data;
+ int ret, i;
+
+ ret = kstrtou8(buf, 10, &data);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(ad7746_vt_filter_rate_table); i++)
+ if (data >= ad7746_vt_filter_rate_table[i][0])
+ break;
+
+ if (i >= ARRAY_SIZE(ad7746_vt_filter_rate_table))
+ i = ARRAY_SIZE(ad7746_vt_filter_rate_table) - 1;
+
+ mutex_lock(&indio_dev->mlock);
+ chip->config &= ~AD7746_CONF_VTFS(0x3);
+ chip->config |= AD7746_CONF_VTFS(i);
+ mutex_unlock(&indio_dev->mlock);
+
+ return len;
+}
+
+static IIO_DEVICE_ATTR(in_capacitance_sampling_frequency,
+ S_IRUGO | S_IWUSR, ad7746_show_cap_filter_rate_setup,
+ ad7746_store_cap_filter_rate_setup, 0);
+
+static IIO_DEVICE_ATTR(in_voltage_sampling_frequency,
+ S_IRUGO | S_IWUSR, ad7746_show_vt_filter_rate_setup,
+ ad7746_store_vt_filter_rate_setup, 0);
+
+static IIO_CONST_ATTR(in_voltage_sampling_frequency_available, "50 31 16 8");
+static IIO_CONST_ATTR(in_capacitance_sampling_frequency_available,
+ "91 84 50 26 16 13 11 9");
+
+static struct attribute *ad7746_attributes[] = {
+ &iio_dev_attr_in_capacitance_sampling_frequency.dev_attr.attr,
+ &iio_dev_attr_in_voltage_sampling_frequency.dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr,
+ &iio_dev_attr_in_voltage0_calibscale_calibration.dev_attr.attr,
+ &iio_const_attr_in_voltage_sampling_frequency_available.dev_attr.attr,
+ &iio_const_attr_in_capacitance_sampling_frequency_available.
+ dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7746_attribute_group = {
+ .attrs = ad7746_attributes,
+};
+
+static int ad7746_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ int ret, reg;
+
+ mutex_lock(&indio_dev->mlock);
+
+ switch (mask) {
+ case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
+ if (val != 1) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ val = (val2 * 1024) / 15625;
+
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ reg = AD7746_REG_CAP_GAINH;
+ break;
+ case IIO_VOLTAGE:
+ reg = AD7746_REG_VOLT_GAINH;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = i2c_smbus_write_word_data(chip->client, reg, swab16(val));
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ break;
+ case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED):
+ if ((val < 0) | (val > 0xFFFF)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = i2c_smbus_write_word_data(chip->client,
+ AD7746_REG_CAP_OFFH, swab16(val));
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ break;
+ case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
+ if ((val < 0) | (val > 43008000)) { /* 21pF */
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* CAPDAC Scale = 21pF_typ / 127
+ * CIN Scale = 8.192pF / 2^24
+ * Offset Scale = CAPDAC Scale / CIN Scale = 338646
+ * */
+
+ val /= 338646;
+
+ chip->capdac[chan->channel][chan->differential] = (val > 0 ?
+ AD7746_CAPDAC_DACP(val) | AD7746_CAPDAC_DACEN : 0);
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACA,
+ chip->capdac[chan->channel][0]);
+ if (ret < 0)
+ goto out;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACB,
+ chip->capdac[chan->channel][1]);
+ if (ret < 0)
+ goto out;
+
+ chip->capdac_set = chan->channel;
+
+ ret = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+out:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+
+static int ad7746_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2,
+ long mask)
+{
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ int ret, delay;
+ u8 regval, reg;
+
+ union {
+ u32 d32;
+ u8 d8[4];
+ } data;
+
+ mutex_lock(&indio_dev->mlock);
+
+ switch (mask) {
+ case 0:
+ ret = ad7746_select_channel(indio_dev, chan);
+ if (ret < 0)
+ goto out;
+ delay = ret;
+
+ regval = chip->config | AD7746_CONF_MODE_SINGLE_CONV;
+ ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG,
+ regval);
+ if (ret < 0)
+ goto out;
+
+ msleep(delay);
+ /* Now read the actual register */
+
+ ret = i2c_smbus_read_i2c_block_data(chip->client,
+ chan->address >> 8, 3, &data.d8[1]);
+
+ if (ret < 0)
+ goto out;
+
+ *val = (be32_to_cpu(data.d32) & 0xFFFFFF) - 0x800000;
+
+ switch (chan->type) {
+ case IIO_TEMP:
+ /* temperature in milli degrees Celsius
+ * T = ((*val / 2048) - 4096) * 1000
+ */
+ *val = (*val * 125) / 256;
+ break;
+ case IIO_VOLTAGE:
+ if (chan->channel == 1) /* supply_raw*/
+ *val = *val * 6;
+ break;
+ default:
+ break;
+ }
+
+ ret = IIO_VAL_INT;
+ break;
+ case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ reg = AD7746_REG_CAP_GAINH;
+ break;
+ case IIO_VOLTAGE:
+ reg = AD7746_REG_VOLT_GAINH;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = i2c_smbus_read_word_data(chip->client, reg);
+ if (ret < 0)
+ goto out;
+ /* 1 + gain_val / 2^16 */
+ *val = 1;
+ *val2 = (15625 * swab16(ret)) / 1024;
+
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED):
+ ret = i2c_smbus_read_word_data(chip->client,
+ AD7746_REG_CAP_OFFH);
+ if (ret < 0)
+ goto out;
+ *val = swab16(ret);
+
+ ret = IIO_VAL_INT;
+ break;
+ case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
+ *val = AD7746_CAPDAC_DACP(chip->capdac[chan->channel]
+ [chan->differential]) * 338646;
+
+ ret = IIO_VAL_INT;
+ break;
+ case (1 << IIO_CHAN_INFO_SCALE_SHARED):
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ /* 8.192pf / 2^24 */
+ *val2 = 488;
+ *val = 0;
+ break;
+ case IIO_VOLTAGE:
+ /* 1170mV / 2^23 */
+ *val2 = 139475;
+ *val = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ default:
+ ret = -EINVAL;
+ };
+out:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+
+static const struct iio_info ad7746_info = {
+ .attrs = &ad7746_attribute_group,
+ .read_raw = &ad7746_read_raw,
+ .write_raw = &ad7746_write_raw,
+ .driver_module = THIS_MODULE,
+};
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit ad7746_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ad7746_platform_data *pdata = client->dev.platform_data;
+ struct ad7746_chip_info *chip;
+ struct iio_dev *indio_dev;
+ int ret = 0;
+ unsigned char regval = 0;
+
+ indio_dev = iio_allocate_device(sizeof(*chip));
+ if (indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ chip = iio_priv(indio_dev);
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, indio_dev);
+
+ chip->client = client;
+ chip->capdac_set = -1;
+
+ /* Establish that the iio_dev is a child of the i2c device */
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &ad7746_info;
+ indio_dev->channels = ad7746_channels;
+ if (id->driver_data == 7746)
+ indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
+ else
+ indio_dev->num_channels = ARRAY_SIZE(ad7746_channels) - 2;
+ indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ if (pdata) {
+ if (pdata->exca_en) {
+ if (pdata->exca_inv_en)
+ regval |= AD7746_EXCSETUP_NEXCA;
+ else
+ regval |= AD7746_EXCSETUP_EXCA;
+ }
+
+ if (pdata->excb_en) {
+ if (pdata->excb_inv_en)
+ regval |= AD7746_EXCSETUP_NEXCB;
+ else
+ regval |= AD7746_EXCSETUP_EXCB;
+ }
+
+ regval |= AD7746_EXCSETUP_EXCLVL(pdata->exclvl);
+ } else {
+ dev_warn(&client->dev, "No platform data? using default\n");
+ regval = AD7746_EXCSETUP_EXCA | AD7746_EXCSETUP_EXCB |
+ AD7746_EXCSETUP_EXCLVL(3);
+ }
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_EXC_SETUP, regval);
+ if (ret < 0)
+ goto error_free_dev;
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_free_dev;
+
+ dev_info(&client->dev, "%s capacitive sensor registered\n", id->name);
+
+ return 0;
+
+error_free_dev:
+ iio_free_device(indio_dev);
+error_ret:
+ return ret;
+}
+
+static int __devexit ad7746_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+ iio_free_device(indio_dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id ad7746_id[] = {
+ { "ad7745", 7745 },
+ { "ad7746", 7746 },
+ { "ad7747", 7747 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad7746_id);
+
+static struct i2c_driver ad7746_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ },
+ .probe = ad7746_probe,
+ .remove = __devexit_p(ad7746_remove),
+ .id_table = ad7746_id,
+};
+
+static __init int ad7746_init(void)
+{
+ return i2c_add_driver(&ad7746_driver);
+}
+
+static __exit void ad7746_exit(void)
+{
+ i2c_del_driver(&ad7746_driver);
+}
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD7746/5/7 capacitive sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(ad7746_init);
+module_exit(ad7746_exit);
--- /dev/null
+/*
+ * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef IIO_CDC_AD7746_H_
+#define IIO_CDC_AD7746_H_
+
+/*
+ * TODO: struct ad7746_platform_data needs to go into include/linux/iio
+ */
+
+#define AD7466_EXCLVL_0 0 /* +-VDD/8 */
+#define AD7466_EXCLVL_1 1 /* +-VDD/4 */
+#define AD7466_EXCLVL_2 2 /* +-VDD * 3/8 */
+#define AD7466_EXCLVL_3 3 /* +-VDD/2 */
+
+struct ad7746_platform_data {
+ unsigned char exclvl; /*Excitation Voltage Level */
+ bool exca_en; /* enables EXCA pin as the excitation output */
+ bool exca_inv_en; /* enables /EXCA pin as the excitation output */
+ bool excb_en; /* enables EXCB pin as the excitation output */
+ bool excb_inv_en; /* enables /EXCB pin as the excitation output */
+};
+
+#endif /* IIO_CDC_AD7746_H_ */
projects / firefly-linux-kernel-4.4.55.git / commitdiff