+/* drivers/i2c/chips/akm8975.c - akm8975 compass driver
+ *
+ * Copyright (C) 2007-2008 HTC Corporation.
+ * Author: Hou-Kun Chen <houkun.chen@gmail.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
/*
- * A sensor driver for the magnetometer AK8975.
+ * Revised by AKM 2009/04/02
*
- * Magnetic compass sensor driver for monitoring magnetic flux information.
- *
- * Copyright (c) 2010, NVIDIA Corporation.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/err.h>
-#include <linux/mutex.h>
-#include <linux/delay.h>
-
-#include <linux/gpio.h>
-
-#include "../iio.h"
-#include "magnet.h"
-
-/*
- * Register definitions, as well as various shifts and masks to get at the
- * individual fields of the registers.
- */
-#define AK8975_REG_WIA 0x00
-#define AK8975_DEVICE_ID 0x48
-
-#define AK8975_REG_INFO 0x01
-
-#define AK8975_REG_ST1 0x02
-#define AK8975_REG_ST1_DRDY_SHIFT 0
-#define AK8975_REG_ST1_DRDY_MASK (1 << AK8975_REG_ST1_DRDY_SHIFT)
-
-#define AK8975_REG_HXL 0x03
-#define AK8975_REG_HXH 0x04
-#define AK8975_REG_HYL 0x05
-#define AK8975_REG_HYH 0x06
-#define AK8975_REG_HZL 0x07
-#define AK8975_REG_HZH 0x08
-#define AK8975_REG_ST2 0x09
-#define AK8975_REG_ST2_DERR_SHIFT 2
-#define AK8975_REG_ST2_DERR_MASK (1 << AK8975_REG_ST2_DERR_SHIFT)
-
-#define AK8975_REG_ST2_HOFL_SHIFT 3
-#define AK8975_REG_ST2_HOFL_MASK (1 << AK8975_REG_ST2_HOFL_SHIFT)
-
-#define AK8975_REG_CNTL 0x0A
-#define AK8975_REG_CNTL_MODE_SHIFT 0
-#define AK8975_REG_CNTL_MODE_MASK (0xF << AK8975_REG_CNTL_MODE_SHIFT)
-#define AK8975_REG_CNTL_MODE_POWER_DOWN 0
-#define AK8975_REG_CNTL_MODE_ONCE 1
-#define AK8975_REG_CNTL_MODE_SELF_TEST 8
-#define AK8975_REG_CNTL_MODE_FUSE_ROM 0xF
-
-#define AK8975_REG_RSVC 0x0B
-#define AK8975_REG_ASTC 0x0C
-#define AK8975_REG_TS1 0x0D
-#define AK8975_REG_TS2 0x0E
-#define AK8975_REG_I2CDIS 0x0F
-#define AK8975_REG_ASAX 0x10
-#define AK8975_REG_ASAY 0x11
-#define AK8975_REG_ASAZ 0x12
-
-#define AK8975_MAX_REGS AK8975_REG_ASAZ
-
-/*
- * Miscellaneous values.
- */
-#define AK8975_MAX_CONVERSION_TRIAL 5
-#define AK8975_MAX_CONVERSION_TIMEOUT 500
-#define AK8975_CONVERSION_DONE_POLL_TIME 10
-
-/*
- * Per-instance context data for the device.
- */
-struct ak8975_data {
+ */
+
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/miscdevice.h>
+#include <linux/gpio.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/workqueue.h>
+#include <linux/freezer.h>
+#include <linux/earlysuspend.h>
+#include "ak8975.h"
+
+#define AKM8975_DEBUG 1
+#define AKM8975_DEBUG_MSG 1
+#define AKM8975_DEBUG_FUNC 0
+#define AKM8975_DEBUG_DATA 0
+#define MAX_FAILURE_COUNT 3
+#define AKM8975_RETRY_COUNT 10
+#define AKM8975_DEFAULT_DELAY 100
+
+#if AKM8975_DEBUG_MSG
+#define AKMDBG(format, ...) printk(KERN_INFO "AKM8975 " format "\n", ## __VA_ARGS__)
+#else
+#define AKMDBG(format, ...)
+#endif
+
+#if AKM8975_DEBUG_FUNC
+#define AKMFUNC(func) printk(KERN_INFO "AKM8975 " func " is called\n")
+#else
+#define AKMFUNC(func)
+#endif
+
+static struct i2c_client *this_client;
+
+struct akm8975_data {
struct i2c_client *client;
- struct iio_dev *indio_dev;
- struct attribute_group attrs;
- struct mutex lock;
- u8 asa[3];
- unsigned long mode;
- u8 reg_cache[AK8975_MAX_REGS];
- int eoc_gpio;
+ struct input_dev *input_dev;
+ struct work_struct work;
+ struct early_suspend akm_early_suspend;
int eoc_irq;
-};
-
-/*
- * Helper function to write to the I2C device's registers.
- */
-static bool ak8975_write_data(struct i2c_client *client,
- u8 reg, u8 val, u8 mask, u8 shift)
-{
- u8 regval;
- struct i2c_msg msg;
- u8 w_data[2];
- int ret = 0;
-
- struct ak8975_data *data = i2c_get_clientdata(client);
-
- regval = data->reg_cache[reg];
- regval &= ~mask;
- regval |= val << shift;
-
- w_data[0] = reg;
- w_data[1] = regval;
-
- msg.addr = client->addr;
- msg.flags = 0;
- msg.len = 2;
- msg.buf = w_data;
-
- ret = i2c_transfer(client->adapter, &msg, 1);
- if (ret < 0) {
- dev_err(&client->dev, "Write to device fails status %x\n", ret);
- return false;
- }
- data->reg_cache[reg] = regval;
-
- return true;
-}
-
-/*
- * Helper function to read a contiguous set of the I2C device's registers.
- */
-static bool ak8975_read_data(struct i2c_client *client,
- u8 reg, u8 length, u8 *buffer)
-{
- struct i2c_msg msg[2];
- u8 w_data[2];
- int ret = 0;
-
- w_data[0] = reg;
-
- msg[0].addr = client->addr;
- msg[0].flags = I2C_M_NOSTART; /* set repeated start and write */
- msg[0].len = 1;
- msg[0].buf = w_data;
-
- msg[1].addr = client->addr;
- msg[1].flags = I2C_M_RD;
- msg[1].len = length;
- msg[1].buf = buffer;
-
- ret = i2c_transfer(client->adapter, msg, 2);
- if (ret < 0) {
- dev_err(&client->dev, "Read from device fails\n");
- return false;
- }
-
- return true;
-}
-
-/*
- * Perform some start-of-day setup, including reading the asa calibration
- * values and caching them.
- */
-static int ak8975_setup(struct i2c_client *client)
-{
- struct ak8975_data *data = i2c_get_clientdata(client);
- u8 device_id;
- u8 buffer[3];
- bool status;
-
- /* Confirm that the device we're talking to is really an AK8975. */
- status = ak8975_read_data(client, AK8975_REG_WIA, 1, &device_id);
- if ((!status) || (device_id != AK8975_DEVICE_ID)) {
- dev_err(&client->dev, "Device ak8975 not found\n");
- return -ENODEV;
- }
-
- /* Write the fused rom access mode. */
- status = ak8975_write_data(client, AK8975_REG_CNTL, AK8975_REG_CNTL_MODE_FUSE_ROM, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT);
- if (!status) {
- dev_err(&client->dev, "Error in setting fuse access mode\n");
- return false;
- }
-
- /* Get asa data and store in the device data. */
- status = ak8975_read_data(client, AK8975_REG_ASAX, 3, buffer);
- if (!status) {
- dev_err(&client->dev, "Not able to read asa data\n");
- return -ENODEV;
- }
-
- data->asa[0] = buffer[0] & 0xFF;
- data->asa[1] = buffer[1] & 0xFF;
- data->asa[2] = buffer[2] & 0xFF;
-
- return 0;
-}
-
-/*
- * Shows the device's mode. 0 = off, 1 = on.
- */
-static ssize_t show_mode(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ak8975_data *data = indio_dev->dev_data;
-
- return sprintf(buf, "%lu\n", data->mode);
-}
-
-/*
- * Sets the device's mode. 0 = off, 1 = on. The device's mode must be on
- * for the magn raw attributes to be available.
- */
-static ssize_t store_mode(struct device *dev, struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ak8975_data *data = indio_dev->dev_data;
- struct i2c_client *client = data->client;
- unsigned long oval;
- bool status;
-
- /* Convert mode string and do some basic sanity checking on it.
- only 0 or 1 are valid. */
- if (strict_strtol(buf, 10, &oval))
- return -EINVAL;
-
- if ((oval < 0) || (oval > 1)) {
- dev_err(dev, "mode value is not supported\n");
- return -EINVAL;
- }
-
- mutex_lock(&data->lock);
-
- /* Write the mode to the device. */
- if (data->mode != oval) {
- status = ak8975_write_data(client, AK8975_REG_CNTL, (u8)oval, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT);
- if (!status) {
- dev_err(&client->dev, "Error in setting mode\n");
- mutex_unlock(&data->lock);
- return -EINVAL;
- }
- data->mode = oval;
- }
-
- mutex_unlock(&data->lock);
-
- return count;
-}
-
-/*
- * Emits the ASA sensitivity adjustment value for the x, y, or z axis.
- * These ASA values are read from the sensor device at start of day, and
- * cached in the device context struct.
- */
-static ssize_t show_calibscale(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ak8975_data *data = indio_dev->dev_data;
- struct iio_dev_attr *this_attr = to_iio_dev_attr(devattr);
-
- if (!data) {
- dev_err(dev, "No device found\n");
- return -ENODEV;
- }
-
- return sprintf(buf, "%d\n", data->asa[this_attr->address]);
-}
-
-/*
- * Emits the raw flux value for the x, y, or z axis.
- *
- * Adjusting the flux value with the sensitivity adjustment value should be
- * done via the following formula:
- *
- * Hadj = H * ( ( ( (ASA-128)*0.5 ) / 128 ) + 1 )
- *
- * where H is the raw value, ASA is the sensitivity adjustment, and Hadj
- * is the resultant adjusted value.
- */
-static ssize_t show_raw(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ak8975_data *data = indio_dev->dev_data;
- struct i2c_client *client = data->client;
- struct iio_dev_attr *this_attr = to_iio_dev_attr(devattr);
- u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT;
- u16 meas_reg;
- s16 raw;
- u8 read_status;
- bool status;
- int state;
-
- /* Set up the device for taking a sample. */
- status = ak8975_write_data(client, AK8975_REG_CNTL, AK8975_REG_CNTL_MODE_ONCE, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT);
- if (!status) {
- dev_err(&client->dev, "Error in setting operating mode\n");
- return false;
- }
-
- /* Wait for the conversion to complete. */
- while (timeout_ms) {
- msleep(AK8975_CONVERSION_DONE_POLL_TIME);
- state = (gpio_get_value(data->eoc_gpio) ? 1 : 0);
- if (state)
- break;
- timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME;
- }
- if (!timeout_ms) {
- dev_err(&client->dev, "Conversion timeout happend\n");
- return false;
- }
-
- status = ak8975_read_data(client, AK8975_REG_ST1, 1, &read_status);
- if (!status) {
- dev_err(&client->dev, "Error in reading ST1\n");
- return false;
- }
-
- if (read_status & AK8975_REG_ST1_DRDY_MASK) {
- status = ak8975_read_data(client, AK8975_REG_ST2, 1, &read_status);
- if (!status) {
- dev_err(&client->dev, "Error in reading ST2\n");
- return false;
- }
- if (read_status & (AK8975_REG_ST2_DERR_MASK | AK8975_REG_ST2_HOFL_MASK)) {
- dev_err(&client->dev, "ST2 status error 0x%x\n",
- read_status);
- return false;
- }
+};
+
+/* Addresses to scan -- protected by sense_data_mutex */
+static char sense_data[SENSOR_DATA_SIZE];
+static struct mutex sense_data_mutex;
+static DECLARE_WAIT_QUEUE_HEAD(data_ready_wq);
+static DECLARE_WAIT_QUEUE_HEAD(open_wq);
+
+static atomic_t data_ready;
+static atomic_t open_count;
+static atomic_t open_flag;
+static atomic_t reserve_open_flag;
+
+static atomic_t m_flag;
+static atomic_t a_flag;
+static atomic_t mv_flag;
+
+static int failure_count = 0;
+
+static short akmd_delay = AKM8975_DEFAULT_DELAY;
+
+static atomic_t suspend_flag = ATOMIC_INIT(0);
+
+//static struct akm8975_platform_data *pdata;
+
+static int AKI2C_RxData(char *rxData, int length)
+{
+ uint8_t loop_i;
+ struct i2c_msg msgs[] = {
+ {
+ .addr = this_client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = rxData,
+ },
+ {
+ .addr = this_client->addr,
+ .flags = I2C_M_RD,
+ .len = length,
+ .buf = rxData,
+ },
+ };
+#if AKM8975_DEBUG_DATA
+ int i;
+ char addr = rxData[0];
+#endif
+#ifdef AKM8975_DEBUG
+ /* Caller should check parameter validity.*/
+ if ((rxData == NULL) || (length < 1)) {
+ return -EINVAL;
+ }
+#endif
+ for (loop_i = 0; loop_i < AKM8975_RETRY_COUNT; loop_i++) {
+ if (i2c_transfer(this_client->adapter, msgs, 2) > 0) {
+ break;
+ }
+ mdelay(10);
+ }
+
+ if (loop_i >= AKM8975_RETRY_COUNT) {
+ printk(KERN_ERR "%s retry over %d\n", __func__, AKM8975_RETRY_COUNT);
+ return -EIO;
+ }
+#if AKM8975_DEBUG_DATA
+ printk(KERN_INFO "RxData: len=%02x, addr=%02x\n data=", length, addr);
+ for (i = 0; i < length; i++) {
+ printk(KERN_INFO " %02x", rxData[i]);
+ }
+ printk(KERN_INFO "\n");
+#endif
+ return 0;
+}
+
+static int AKI2C_TxData(char *txData, int length)
+{
+ uint8_t loop_i;
+ struct i2c_msg msg[] = {
+ {
+ .addr = this_client->addr,
+ .flags = 0,
+ .len = length,
+ .buf = txData,
+ },
+ };
+#if AKM8975_DEBUG_DATA
+ int i;
+#endif
+#ifdef AKM8975_DEBUG
+ /* Caller should check parameter validity.*/
+ if ((txData == NULL) || (length < 2)) {
+ return -EINVAL;
+ }
+#endif
+ for (loop_i = 0; loop_i < AKM8975_RETRY_COUNT; loop_i++) {
+ if (i2c_transfer(this_client->adapter, msg, 1) > 0) {
+ break;
+ }
+ mdelay(10);
+ }
+
+ if (loop_i >= AKM8975_RETRY_COUNT) {
+ printk(KERN_ERR "%s retry over %d\n", __func__, AKM8975_RETRY_COUNT);
+ return -EIO;
+ }
+#if AKM8975_DEBUG_DATA
+ printk(KERN_INFO "TxData: len=%02x, addr=%02x\n data=", length, txData[0]);
+ for (i = 0; i < (length-1); i++) {
+ printk(KERN_INFO " %02x", txData[i + 1]);
+ }
+ printk(KERN_INFO "\n");
+#endif
+ return 0;
+}
+
+static int AKECS_SetMode_SngMeasure(void)
+{
+ char buffer[2];
+
+ atomic_set(&data_ready, 0);
+
+ /* Set measure mode */
+ buffer[0] = AK8975_REG_CNTL;
+ buffer[1] = AK8975_MODE_SNG_MEASURE;
+
+ /* Set data */
+ return AKI2C_TxData(buffer, 2);
+}
+
+static int AKECS_SetMode_SelfTest(void)
+{
+ char buffer[2];
+
+ /* Set measure mode */
+ buffer[0] = AK8975_REG_CNTL;
+ buffer[1] = AK8975_MODE_SELF_TEST;
+ /* Set data */
+ return AKI2C_TxData(buffer, 2);
+}
+
+static int AKECS_SetMode_FUSEAccess(void)
+{
+ char buffer[2];
+
+ /* Set measure mode */
+ buffer[0] = AK8975_REG_CNTL;
+ buffer[1] = AK8975_MODE_FUSE_ACCESS;
+ /* Set data */
+ return AKI2C_TxData(buffer, 2);
+}
+
+static int AKECS_SetMode_PowerDown(void)
+{
+ char buffer[2];
+
+ /* Set powerdown mode */
+ buffer[0] = AK8975_REG_CNTL;
+ buffer[1] = AK8975_MODE_POWERDOWN;
+ /* Set data */
+ return AKI2C_TxData(buffer, 2);
+}
+
+static int AKECS_SetMode(char mode)
+{
+ int ret;
+
+ switch (mode) {
+ case AK8975_MODE_SNG_MEASURE:
+ ret = AKECS_SetMode_SngMeasure();
+ break;
+ case AK8975_MODE_SELF_TEST:
+ ret = AKECS_SetMode_SelfTest();
+ break;
+ case AK8975_MODE_FUSE_ACCESS:
+ ret = AKECS_SetMode_FUSEAccess();
+ break;
+ case AK8975_MODE_POWERDOWN:
+ ret = AKECS_SetMode_PowerDown();
+ /* wait at least 100us after changing mode */
+ udelay(100);
+ break;
+ default:
+ AKMDBG("%s: Unknown mode(%d)", __func__, mode);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int AKECS_CheckDevice(void)
+{
+ char buffer[2];
+ int ret;
+
+ /* Set measure mode */
+ buffer[0] = AK8975_REG_WIA;
+
+ /* Read data */
+ ret = AKI2C_RxData(buffer, 1);
+ if (ret < 0) {
+ return ret;
+ }
+ /* Check read data */
+ if (buffer[0] != 0x48) {
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static int AKECS_GetData(char *rbuf, int size)
+{
+#ifdef AKM8975_DEBUG
+ /* This function is not exposed, so parameters
+ should be checked internally.*/
+ if ((rbuf == NULL) || (size < SENSOR_DATA_SIZE)) {
+ return -EINVAL;
+ }
+#endif
+ wait_event_interruptible_timeout(data_ready_wq,
+ atomic_read(&data_ready), 1000);
+ if (!atomic_read(&data_ready)) {
+ AKMDBG("%s: data_ready is not set.", __func__);
+ if (!atomic_read(&suspend_flag)) {
+ AKMDBG("%s: suspend_flag is not set.", __func__);
+ failure_count++;
+ if (failure_count >= MAX_FAILURE_COUNT) {
+ printk(KERN_ERR
+ "AKM8975 AKECS_GetData: successive %d failure.\n",
+ failure_count);
+ atomic_set(&open_flag, -1);
+ wake_up(&open_wq);
+ failure_count = 0;
+ }
+ }
+ return -1;
+ }
+
+ mutex_lock(&sense_data_mutex);
+ memcpy(rbuf, sense_data, size);
+ atomic_set(&data_ready, 0);
+ mutex_unlock(&sense_data_mutex);
+
+ failure_count = 0;
+ return 0;
+}
+
+static void AKECS_SetYPR(short *rbuf)
+{
+ struct akm8975_data *data = i2c_get_clientdata(this_client);
+#if AKM8975_DEBUG_DATA
+ printk(KERN_INFO "AKM8975 %s:\n", __func__);
+ printk(KERN_INFO " yaw =%6d, pitch =%6d, roll =%6d\n",
+ rbuf[0], rbuf[1], rbuf[2]);
+ printk(KERN_INFO " tmp =%6d, m_stat =%6d, g_stat =%6d\n",
+ rbuf[3], rbuf[4], rbuf[5]);
+ printk(KERN_INFO " Acceleration[LSB]: %6d,%6d,%6d\n",
+ rbuf[6], rbuf[7], rbuf[8]);
+ printk(KERN_INFO " Geomagnetism[LSB]: %6d,%6d,%6d\n",
+ rbuf[9], rbuf[10], rbuf[11]);
+#endif
+ /* Report magnetic sensor information */
+ if (atomic_read(&m_flag)) {
+ input_report_abs(data->input_dev, ABS_RX, rbuf[0]);
+ input_report_abs(data->input_dev, ABS_RY, rbuf[1]);
+ input_report_abs(data->input_dev, ABS_RZ, rbuf[2]);
+ input_report_abs(data->input_dev, ABS_RUDDER, rbuf[4]);
+ }
+
+ /* Report acceleration sensor information */
+ if (atomic_read(&a_flag)) {
+ input_report_abs(data->input_dev, ABS_X, rbuf[6]);
+ input_report_abs(data->input_dev, ABS_Y, rbuf[7]);
+ input_report_abs(data->input_dev, ABS_Z, rbuf[8]);
+ input_report_abs(data->input_dev, ABS_WHEEL, rbuf[5]);
+ }
+
+ /* Report magnetic vector information */
+ if (atomic_read(&mv_flag)) {
+ input_report_abs(data->input_dev, ABS_HAT0X, rbuf[9]);
+ input_report_abs(data->input_dev, ABS_HAT0Y, rbuf[10]);
+ input_report_abs(data->input_dev, ABS_BRAKE, rbuf[11]);
+ }
+
+ input_sync(data->input_dev);
+}
+
+static int AKECS_GetOpenStatus(void)
+{
+ wait_event_interruptible(open_wq, (atomic_read(&open_flag) != 0));
+ return atomic_read(&open_flag);
+}
+
+static int AKECS_GetCloseStatus(void)
+{
+ wait_event_interruptible(open_wq, (atomic_read(&open_flag) <= 0));
+ return atomic_read(&open_flag);
+}
+
+static void AKECS_CloseDone(void)
+{
+ atomic_set(&m_flag, 1);
+ atomic_set(&a_flag, 1);
+ atomic_set(&mv_flag, 1);
+}
+
+/***** akm_aot functions ***************************************/
+static int akm_aot_open(struct inode *inode, struct file *file)
+{
+ int ret = -1;
+
+ AKMFUNC("akm_aot_open");
+ if (atomic_cmpxchg(&open_count, 0, 1) == 0) {
+ if (atomic_cmpxchg(&open_flag, 0, 1) == 0) {
+ atomic_set(&reserve_open_flag, 1);
+ wake_up(&open_wq);
+ ret = 0;
+ }
+ }
+ return ret;
+}
+
+static int akm_aot_release(struct inode *inode, struct file *file)
+{
+ AKMFUNC("akm_aot_release");
+ atomic_set(&reserve_open_flag, 0);
+ atomic_set(&open_flag, 0);
+ atomic_set(&open_count, 0);
+ wake_up(&open_wq);
+ return 0;
+}
+
+static int
+akm_aot_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ short flag;
+
+ switch (cmd) {
+ case ECS_IOCTL_APP_SET_MFLAG:
+ case ECS_IOCTL_APP_SET_AFLAG:
+ case ECS_IOCTL_APP_SET_MVFLAG:
+ if (copy_from_user(&flag, argp, sizeof(flag))) {
+ return -EFAULT;
+ }
+ if (flag < 0 || flag > 1) {
+ return -EINVAL;
+ }
+ break;
+ case ECS_IOCTL_APP_SET_DELAY:
+ if (copy_from_user(&flag, argp, sizeof(flag))) {
+ return -EFAULT;
+ }
+ break;
+ default:
+ break;
+ }
+
+ switch (cmd) {
+ case ECS_IOCTL_APP_SET_MFLAG:
+ atomic_set(&m_flag, flag);
+ AKMDBG("MFLAG is set to %d", flag);
+ break;
+ case ECS_IOCTL_APP_GET_MFLAG:
+ flag = atomic_read(&m_flag);
+ break;
+ case ECS_IOCTL_APP_SET_AFLAG:
+ atomic_set(&a_flag, flag);
+ AKMDBG("AFLAG is set to %d", flag);
+ break;
+ case ECS_IOCTL_APP_GET_AFLAG:
+ flag = atomic_read(&a_flag);
+ break;
+ case ECS_IOCTL_APP_SET_MVFLAG:
+ atomic_set(&mv_flag, flag);
+ AKMDBG("MVFLAG is set to %d", flag);
+ break;
+ case ECS_IOCTL_APP_GET_MVFLAG:
+ flag = atomic_read(&mv_flag);
+ break;
+ case ECS_IOCTL_APP_SET_DELAY:
+ akmd_delay = flag;
+ AKMDBG("Delay is set to %d", flag);
+ break;
+ case ECS_IOCTL_APP_GET_DELAY:
+ flag = akmd_delay;
+ break;
+ default:
+ return -ENOTTY;
+ }
+
+ switch (cmd) {
+ case ECS_IOCTL_APP_GET_MFLAG:
+ case ECS_IOCTL_APP_GET_AFLAG:
+ case ECS_IOCTL_APP_GET_MVFLAG:
+ case ECS_IOCTL_APP_GET_DELAY:
+ if (copy_to_user(argp, &flag, sizeof(flag))) {
+ return -EFAULT;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+/***** akmd functions ********************************************/
+static int akmd_open(struct inode *inode, struct file *file)
+{
+ AKMFUNC("akmd_open");
+ return nonseekable_open(inode, file);
+}
+
+static int akmd_release(struct inode *inode, struct file *file)
+{
+ AKMFUNC("akmd_release");
+ AKECS_CloseDone();
+ return 0;
+}
+
+static int
+akmd_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+
+ /* NOTE: In this function the size of "char" should be 1-byte. */
+ char sData[SENSOR_DATA_SIZE];/* for GETDATA */
+ char rwbuf[RWBUF_SIZE]; /* for READ/WRITE */
+ char mode; /* for SET_MODE*/
+ short value[12]; /* for SET_YPR */
+ short delay; /* for GET_DELAY */
+ int status; /* for OPEN/CLOSE_STATUS */
+ int ret = -1; /* Return value. */
+ /*AKMDBG("%s (0x%08X).", __func__, cmd);*/
+
+ switch (cmd) {
+ case ECS_IOCTL_WRITE:
+ case ECS_IOCTL_READ:
+ if (argp == NULL) {
+ AKMDBG("invalid argument.");
+ return -EINVAL;
+ }
+ if (copy_from_user(&rwbuf, argp, sizeof(rwbuf))) {
+ AKMDBG("copy_from_user failed.");
+ return -EFAULT;
+ }
+ break;
+ case ECS_IOCTL_SET_MODE:
+ if (argp == NULL) {
+ AKMDBG("invalid argument.");
+ return -EINVAL;
+ }
+ if (copy_from_user(&mode, argp, sizeof(mode))) {
+ AKMDBG("copy_from_user failed.");
+ return -EFAULT;
+ }
+ break;
+ case ECS_IOCTL_SET_YPR:
+ if (argp == NULL) {
+ AKMDBG("invalid argument.");
+ return -EINVAL;
+ }
+ if (copy_from_user(&value, argp, sizeof(value))) {
+ AKMDBG("copy_from_user failed.");
+ return -EFAULT;
+ }
+ break;
+ default:
+ break;
+ }
+
+ switch (cmd) {
+ case ECS_IOCTL_WRITE:
+ AKMFUNC("IOCTL_WRITE");
+ if ((rwbuf[0] < 2) || (rwbuf[0] > (RWBUF_SIZE-1))) {
+ AKMDBG("invalid argument.");
+ return -EINVAL;
+ }
+ ret = AKI2C_TxData(&rwbuf[1], rwbuf[0]);
+ if (ret < 0) {
+ return ret;
+ }
+ break;
+ case ECS_IOCTL_READ:
+ AKMFUNC("IOCTL_READ");
+ if ((rwbuf[0] < 1) || (rwbuf[0] > (RWBUF_SIZE-1))) {
+ AKMDBG("invalid argument.");
+ return -EINVAL;
+ }
+ ret = AKI2C_RxData(&rwbuf[1], rwbuf[0]);
+ if (ret < 0) {
+ return ret;
+ }
+ break;
+ case ECS_IOCTL_SET_MODE:
+ AKMFUNC("IOCTL_SET_MODE");
+ ret = AKECS_SetMode(mode);
+ if (ret < 0) {
+ return ret;
+ }
+ break;
+ case ECS_IOCTL_GETDATA:
+ AKMFUNC("IOCTL_GET_DATA");
+ ret = AKECS_GetData(sData, SENSOR_DATA_SIZE);
+ if (ret < 0) {
+ return ret;
+ }
+ break;
+ case ECS_IOCTL_SET_YPR:
+ AKECS_SetYPR(value);
+ break;
+ case ECS_IOCTL_GET_OPEN_STATUS:
+ AKMFUNC("IOCTL_GET_OPEN_STATUS");
+ status = AKECS_GetOpenStatus();
+ AKMDBG("AKECS_GetOpenStatus returned (%d)", status);
+ break;
+ case ECS_IOCTL_GET_CLOSE_STATUS:
+ AKMFUNC("IOCTL_GET_CLOSE_STATUS");
+ status = AKECS_GetCloseStatus();
+ AKMDBG("AKECS_GetCloseStatus returned (%d)", status);
+ break;
+ case ECS_IOCTL_GET_DELAY:
+ AKMFUNC("IOCTL_GET_DELAY");
+ delay = akmd_delay;
+ break;
+ default:
+ return -ENOTTY;
+ }
+
+ switch (cmd) {
+ case ECS_IOCTL_READ:
+ if (copy_to_user(argp, &rwbuf, rwbuf[0]+1)) {
+ AKMDBG("copy_to_user failed.");
+ return -EFAULT;
+ }
+ break;
+ case ECS_IOCTL_GETDATA:
+ if (copy_to_user(argp, &sData, sizeof(sData))) {
+ AKMDBG("copy_to_user failed.");
+ return -EFAULT;
+ }
+ break;
+ case ECS_IOCTL_GET_OPEN_STATUS:
+ case ECS_IOCTL_GET_CLOSE_STATUS:
+ if (copy_to_user(argp, &status, sizeof(status))) {
+ AKMDBG("copy_to_user failed.");
+ return -EFAULT;
+ }
+ break;
+ case ECS_IOCTL_GET_DELAY:
+ if (copy_to_user(argp, &delay, sizeof(delay))) {
+ AKMDBG("copy_to_user failed.");
+ return -EFAULT;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static void akm8975_work_func(struct work_struct *work)
+{
+ char buffer[SENSOR_DATA_SIZE];
+ int ret;
+
+ memset(buffer, 0, SENSOR_DATA_SIZE);
+ buffer[0] = AK8975_REG_ST1;
+ ret = AKI2C_RxData(buffer, SENSOR_DATA_SIZE);
+ if (ret < 0) {
+ printk(KERN_ERR "AKM8975 akm8975_work_func: I2C failed\n");
+ return;
+ }
+ /* Check ST bit */
+ if ((buffer[0] & 0x01) != 0x01) {
+ printk(KERN_ERR "AKM8975 akm8975_work_func: ST is not set\n");
+ return;
+ }
+
+ mutex_lock(&sense_data_mutex);
+ memcpy(sense_data, buffer, SENSOR_DATA_SIZE);
+ atomic_set(&data_ready, 1);
+ wake_up(&data_ready_wq);
+ mutex_unlock(&sense_data_mutex);
+
+ enable_irq(this_client->irq);
+
+ AKMFUNC("akm8975_work_func");
+}
+
+static irqreturn_t akm8975_interrupt(int irq, void *dev_id)
+{
+ struct akm8975_data *data = dev_id;
+ AKMFUNC("akm8975_interrupt");
+ disable_irq(this_client->irq);
+ schedule_work(&data->work);
+ return IRQ_HANDLED;
+}
+
+static void akm8975_early_suspend(struct early_suspend *handler)
+{
+ AKMFUNC("akm8975_early_suspend");
+ atomic_set(&suspend_flag, 1);
+ atomic_set(&reserve_open_flag, atomic_read(&open_flag));
+ atomic_set(&open_flag, 0);
+ wake_up(&open_wq);
+ disable_irq(this_client->irq);
+ AKMDBG("suspended with flag=%d",
+ atomic_read(&reserve_open_flag));
+}
+
+static void akm8975_early_resume(struct early_suspend *handler)
+{
+ AKMFUNC("akm8975_early_resume");
+ enable_irq(this_client->irq);
+ atomic_set(&suspend_flag, 0);
+ atomic_set(&open_flag, atomic_read(&reserve_open_flag));
+ wake_up(&open_wq);
+ AKMDBG("resumed with flag=%d",
+ atomic_read(&reserve_open_flag));
+}
+
+/*********************************************/
+static struct file_operations akmd_fops = {
+ .owner = THIS_MODULE,
+ .open = akmd_open,
+ .release = akmd_release,
+ .ioctl = akmd_ioctl,
+};
+
+static struct file_operations akm_aot_fops = {
+ .owner = THIS_MODULE,
+ .open = akm_aot_open,
+ .release = akm_aot_release,
+ .ioctl = akm_aot_ioctl,
+};
+
+static struct miscdevice akmd_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "akm8975_dev",
+ .fops = &akmd_fops,
+};
+
+static struct miscdevice akm_aot_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "akm8975_aot",
+ .fops = &akm_aot_fops,
+};
+
+/*********************************************/
+int akm8975_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct akm8975_data *akm;
+ int err = 0;
+
+ AKMFUNC("akm8975_probe");
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ printk(KERN_ERR "AKM8975 akm8975_probe: check_functionality failed.\n");
+ err = -ENODEV;
+ goto exit0;
+ }
+
+ /* Allocate memory for driver data */
+ akm = kzalloc(sizeof(struct akm8975_data), GFP_KERNEL);
+ if (!akm) {
+ printk(KERN_ERR "AKM8975 akm8975_probe: memory allocation failed.\n");
+ err = -ENOMEM;
+ goto exit1;
+ }
+
+ INIT_WORK(&akm->work, akm8975_work_func);
+ i2c_set_clientdata(client, akm);
+
+ this_client = client;
+
+ /* Check connection */
+ err = AKECS_CheckDevice();
+ if (err < 0) {
+ printk(KERN_ERR "AKM8975 akm8975_probe: set power down mode error\n");
+ goto exit3;
+ }
+ akm->eoc_irq = client->irq;
+ if (!akm->eoc_irq) {
+ dev_dbg(&akm->client->dev, "no IRQ?\n");
+ return -ENODEV;
+ }else{
+ akm->eoc_irq = gpio_to_irq(akm->eoc_irq);
}
-
- /* Read the flux value from the appropriate register
- (the register is specified in the iio device attributes). */
- status = ak8975_read_data(client, this_attr->address, 2,
- (u8 *)&meas_reg);
- if (!status) {
- dev_err(&client->dev, "Read axis data fails\n");
- return false;
- }
-
- /* Endian conversion of the measured values */
- raw = (s16) (le16_to_cpu(meas_reg));
-
- return sprintf(buf, "%d\n", raw);
-}
-
-static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, show_mode, store_mode, 0);
-static IIO_DEVICE_ATTR(magn_x_calibscale, S_IRUGO, show_calibscale, NULL, 0);
-static IIO_DEVICE_ATTR(magn_y_calibscale, S_IRUGO, show_calibscale, NULL, 1);
-static IIO_DEVICE_ATTR(magn_z_calibscale, S_IRUGO, show_calibscale, NULL, 2);
-static IIO_DEV_ATTR_MAGN_X(show_raw, AK8975_REG_HXL);
-static IIO_DEV_ATTR_MAGN_Y(show_raw, AK8975_REG_HYL);
-static IIO_DEV_ATTR_MAGN_Z(show_raw, AK8975_REG_HZL);
-
-static struct attribute *ak8975_attr[] = {
- &iio_dev_attr_mode.dev_attr.attr,
- &iio_dev_attr_magn_x_calibscale.dev_attr.attr,
- &iio_dev_attr_magn_y_calibscale.dev_attr.attr,
- &iio_dev_attr_magn_z_calibscale.dev_attr.attr,
- &iio_dev_attr_magn_x_raw.dev_attr.attr,
- &iio_dev_attr_magn_y_raw.dev_attr.attr,
- &iio_dev_attr_magn_z_raw.dev_attr.attr,
- NULL
-};
-
-static struct attribute_group ak8975_attr_group = {
- .attrs = ak8975_attr,
-};
-
-static int ak8975_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct ak8975_data *data;
- int err;
-
- /* Allocate our device context. */
- data = kzalloc(sizeof(struct ak8975_data), GFP_KERNEL);
- if (!data) {
- dev_err(&client->dev, "Memory allocation fails\n");
- err = -ENOMEM;
- goto exit;
- }
-
- i2c_set_clientdata(client, data);
- data->client = client;
-
- mutex_init(&data->lock);
-
- /* Grab and set up the supplied GPIO. */
- data->eoc_irq = client->irq;
- data->eoc_gpio = irq_to_gpio(client->irq);
-
- err = gpio_request(data->eoc_gpio, "ak_8975");
- if (err < 0) {
- dev_err(&client->dev, "failed to request GPIO %d, error %d\n",
- data->eoc_gpio, err);
- goto exit_free;
- }
-
- err = gpio_direction_input(data->eoc_gpio);
+ err = gpio_request(client->irq, "ak_8975");
if (err < 0) {
- dev_err(&client->dev, "Failed to configure input direction for GPIO %d, error %d\n", data->eoc_gpio, err);
- gpio_free(data->eoc_gpio);
- goto exit_gpio;
+ dev_err(&client->dev, "failed to request GPIO, error %d\n", err);
+ goto exit3;
}
-
- /* Perform some basic start-of-day setup of the device. */
- err = ak8975_setup(client);
- if (err < 0) {
- dev_err(&client->dev, "AK8975 initialization fails\n");
- goto exit_gpio;
- }
-
- /* Register with IIO */
- data->indio_dev = iio_allocate_device();
- if (data->indio_dev == NULL) {
- err = -ENOMEM;
- goto exit_gpio;
- }
-
- data->indio_dev->dev.parent = &client->dev;
- data->indio_dev->attrs = &ak8975_attr_group;
- data->indio_dev->dev_data = (void *)(data);
- data->indio_dev->driver_module = THIS_MODULE;
- data->indio_dev->modes = INDIO_DIRECT_MODE;
-
- err = iio_device_register(data->indio_dev);
- if (err < 0)
- goto exit_free_iio;
-
- return 0;
-
-exit_free_iio:
- iio_free_device(data->indio_dev);
-exit_gpio:
- gpio_free(data->eoc_gpio);
-exit_free:
- kfree(data);
-exit:
- return err;
-}
-
-static int ak8975_remove(struct i2c_client *client)
-{
- struct ak8975_data *data = i2c_get_clientdata(client);
-
- iio_device_unregister(data->indio_dev);
- iio_free_device(data->indio_dev);
-
- gpio_free(data->eoc_gpio);
-
- kfree(data);
-
- return 0;
-}
-
-static const struct i2c_device_id ak8975_id[] = {
- {"ak8975", 0},
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ak8975_id);
-
-static struct i2c_driver ak8975_driver = {
- .driver = {
- .name = "ak8975",
- },
- .probe = ak8975_probe,
- .remove = __devexit_p(ak8975_remove),
- .id_table = ak8975_id,
-};
-
-static int __init ak8975_init(void)
-{
- return i2c_add_driver(&ak8975_driver);
-}
-
-static void __exit ak8975_exit(void)
-{
- i2c_del_driver(&ak8975_driver);
-}
-
-module_init(ak8975_init);
-module_exit(ak8975_exit);
-
-MODULE_AUTHOR("Laxman Dewangan <ldewangan [at] nvidia>");
-MODULE_DESCRIPTION("AK8975 magnetometer driver");
-MODULE_LICENSE("GPL");
+ /* IRQ */
+ err = request_irq(akm->eoc_irq, akm8975_interrupt, IRQ_TYPE_EDGE_RISING,
+ "akm8975_DRDY", akm);
+ if (err < 0) {
+ printk(KERN_ERR "AKM8975 akm8975_probe: request irq failed\n");
+ goto exit4;
+ }
+
+ /* Declare input device */
+ akm->input_dev = input_allocate_device();
+ if (!akm->input_dev) {
+ err = -ENOMEM;
+ printk(KERN_ERR
+ "AKM8975 akm8975_probe: Failed to allocate input device\n");
+ goto exit5;
+ }
+ /* Setup input device */
+ set_bit(EV_ABS, akm->input_dev->evbit);
+ /* yaw (0, 360) */
+ input_set_abs_params(akm->input_dev, ABS_RX, 0, 23040, 0, 0);
+ /* pitch (-180, 180) */
+ input_set_abs_params(akm->input_dev, ABS_RY, -11520, 11520, 0, 0);
+ /* roll (-90, 90) */
+ input_set_abs_params(akm->input_dev, ABS_RZ, -5760, 5760, 0, 0);
+ /* x-axis acceleration (720 x 8G) */
+ input_set_abs_params(akm->input_dev, ABS_X, -5760, 5760, 0, 0);
+ /* y-axis acceleration (720 x 8G) */
+ input_set_abs_params(akm->input_dev, ABS_Y, -5760, 5760, 0, 0);
+ /* z-axis acceleration (720 x 8G) */
+ input_set_abs_params(akm->input_dev, ABS_Z, -5760, 5760, 0, 0);
+ /* temparature */
+ /*
+ input_set_abs_params(akm->input_dev, ABS_THROTTLE, -30, 85, 0, 0);
+ */
+ /* status of magnetic sensor */
+ input_set_abs_params(akm->input_dev, ABS_RUDDER, -32768, 3, 0, 0);
+ /* status of acceleration sensor */
+ input_set_abs_params(akm->input_dev, ABS_WHEEL, -32768, 3, 0, 0);
+ /* x-axis of raw magnetic vector (-4096, 4095) */
+ input_set_abs_params(akm->input_dev, ABS_HAT0X, -20480, 20479, 0, 0);
+ /* y-axis of raw magnetic vector (-4096, 4095) */
+ input_set_abs_params(akm->input_dev, ABS_HAT0Y, -20480, 20479, 0, 0);
+ /* z-axis of raw magnetic vector (-4096, 4095) */
+ input_set_abs_params(akm->input_dev, ABS_BRAKE, -20480, 20479, 0, 0);
+ /* Set name */
+ akm->input_dev->name = "compass";
+
+ /* Register */
+ err = input_register_device(akm->input_dev);
+ if (err) {
+ printk(KERN_ERR
+ "AKM8975 akm8975_probe: Unable to register input device\n");
+ goto exit6;
+ }
+
+ err = misc_register(&akmd_device);
+ if (err) {
+ printk(KERN_ERR
+ "AKM8975 akm8975_probe: akmd_device register failed\n");
+ goto exit7;
+ }
+
+ err = misc_register(&akm_aot_device);
+ if (err) {
+ printk(KERN_ERR
+ "AKM8975 akm8975_probe: akm_aot_device register failed\n");
+ goto exit8;
+ }
+
+ mutex_init(&sense_data_mutex);
+
+ init_waitqueue_head(&data_ready_wq);
+ init_waitqueue_head(&open_wq);
+
+ /* As default, report all information */
+ atomic_set(&m_flag, 1);
+ atomic_set(&a_flag, 1);
+ atomic_set(&mv_flag, 1);
+
+ akm->akm_early_suspend.suspend = akm8975_early_suspend;
+ akm->akm_early_suspend.resume = akm8975_early_resume;
+ register_early_suspend(&akm->akm_early_suspend);
+
+ AKMDBG("successfully probed.");
+ return 0;
+
+exit8:
+ misc_deregister(&akmd_device);
+exit7:
+ input_unregister_device(akm->input_dev);
+exit6:
+ input_free_device(akm->input_dev);
+exit5:
+ free_irq(client->irq, akm);
+exit4:
+exit3:
+ kfree(akm);
+exit1:
+exit0:
+ return err;
+
+}
+
+static int akm8975_remove(struct i2c_client *client)
+{
+ struct akm8975_data *akm = i2c_get_clientdata(client);
+ AKMFUNC("akm8975_remove");
+ unregister_early_suspend(&akm->akm_early_suspend);
+ misc_deregister(&akm_aot_device);
+ misc_deregister(&akmd_device);
+ input_unregister_device(akm->input_dev);
+ free_irq(client->irq, akm);
+ kfree(akm);
+ AKMDBG("successfully removed.");
+ return 0;
+}
+
+static const struct i2c_device_id akm8975_id[] = {
+ {AKM8975_I2C_NAME, 0 },
+ { }
+};
+
+static struct i2c_driver akm8975_driver = {
+ .probe = akm8975_probe,
+ .remove = akm8975_remove,
+ .id_table = akm8975_id,
+ .driver = {
+ .name = AKM8975_I2C_NAME,
+ },
+};
+
+static int __init akm8975_init(void)
+{
+ printk(KERN_INFO "AKM8975 compass driver: initialize\n");
+ return i2c_add_driver(&akm8975_driver);
+}
+
+static void __exit akm8975_exit(void)
+{
+ printk(KERN_INFO "AKM8975 compass driver: release\n");
+ i2c_del_driver(&akm8975_driver);
+}
+
+module_init(akm8975_init);
+module_exit(akm8975_exit);
+
+MODULE_AUTHOR("viral wang <viral_wang@htc.com>");
+MODULE_DESCRIPTION("AKM8975 compass driver");
+MODULE_LICENSE("GPL");
+
projects / firefly-linux-kernel-4.4.55.git / commitdiff