+++ /dev/null
-/*
- * drivers/input/touchscreen/rk2818_spi_xpt2046_ts.c - driver for rk2818 spi xpt2046 device and console
- *
- * Copyright (C) 2010 ROCKCHIP, Inc.
- *
- * 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.
- */
-
-#include <linux/hwmon.h>
-#include <linux/init.h>
-#include <linux/err.h>
-#include <linux/delay.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/spi/spi.h>
-#include <asm/irq.h>
-
-#include "rk2818_spi_xpt2046_ts.h"
-
-/*
- * This code has been heavily tested on a Nokia 770, and lightly
- * tested on other xpt2046 devices (OSK/Mistral, Lubbock).
- * TSC2046 is just newer xpt2046 silicon.
- * Support for ads7843 tested on Atmel at91sam926x-EK.
- * Support for ads7845 has only been stubbed in.
- *
- * IRQ handling needs a workaround because of a shortcoming in handling
- * edge triggered IRQs on some platforms like the OMAP1/2. These
- * platforms don't handle the ARM lazy IRQ disabling properly, thus we
- * have to maintain our own SW IRQ disabled status. This should be
- * removed as soon as the affected platform's IRQ handling is fixed.
- *
- * app note sbaa036 talks in more detail about accurate sampling...
- * that ought to help in situations like LCDs inducing noise (which
- * can also be helped by using synch signals) and more generally.
- * This driver tries to utilize the measures described in the app
- * note. The strength of filtering can be set in the board-* specific
- * files.
- */
-#define XPT2046_DEBUG 0
-#if XPT2046_DEBUG
- #define xpt2046printk(msg...) printk(msg);
-#else
- #define xpt2046printk(msg...)
-#endif
-#define LCD_MAX_LENGTH 800
-#define LCD_MAX_WIDTH 480
-#define PT2046_TOUCH_AD_LEFT 3855
-#define PT2046_TOUCH_AD_RIGHT 260
-#define PT2046_TOUCH_AD_TOP 300
-#define PT2046_TOUCH_AD_BOTTOM 3755
-#define AD_TO_X(adx) (LCD_MAX_WIDTH * (adx - PT2046_TOUCH_AD_TOP) / ( PT2046_TOUCH_AD_BOTTOM - PT2046_TOUCH_AD_TOP ))
-#define AD_TO_Y(ady) (LCD_MAX_LENGTH * (PT2046_TOUCH_AD_LEFT - ady) / (PT2046_TOUCH_AD_LEFT - PT2046_TOUCH_AD_RIGHT))
-
-#define TS_POLL_DELAY (15 * 1000000) /* ns delay before the first sample */
-#define TS_POLL_PERIOD (15 * 1000000) /* ns delay between samples */
-
-#define DEBOUNCE_REPTIME 3
-/* this driver doesn't aim at the peak continuous sample rate */
-#define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
-
-struct ts_event {
- /* For portability, we can't read 12 bit values using SPI (which
- * would make the controller deliver them as native byteorder u16
- * with msbs zeroed). Instead, we read them as two 8-bit values,
- * *** WHICH NEED BYTESWAPPING *** and range adjustment.
- */
- u16 x;
- u16 y;
- int ignore;
-};
-
-/*
- * We allocate this separately to avoid cache line sharing issues when
- * driver is used with DMA-based SPI controllers (like atmel_spi) on
- * systems where main memory is not DMA-coherent (most non-x86 boards).
- */
-struct xpt2046_packet {
- u8 read_x, read_y, pwrdown;
- u16 dummy; /* for the pwrdown read */
- struct ts_event tc;
-};
-
-struct xpt2046 {
- struct input_dev *input;
- char phys[32];
- char name[32];
-
- struct spi_device *spi;
-
- u16 model;
- bool swap_xy;
-
- struct xpt2046_packet *packet;
-
- struct spi_transfer xfer[18];
- struct spi_message msg[5];
- struct spi_message *last_msg;
- int msg_idx;
- int read_cnt;
- int read_rep;
- int last_read;
-
- u16 debounce_max;
- u16 debounce_tol;
- u16 debounce_rep;
-
- u16 penirq_recheck_delay_usecs;
-
- spinlock_t lock;
- struct hrtimer timer;
- unsigned pendown:1; /* P: lock */
- unsigned pending:1; /* P: lock */
-// FIXME remove "irq_disabled"
- unsigned irq_disabled:1; /* P: lock */
- unsigned disabled:1;
- unsigned is_suspended:1;
-
- int (*filter)(void *data, int data_idx, int *val);
- void *filter_data;
- void (*filter_cleanup)(void *data);
- int (*get_pendown_state)(void);
- int gpio_pendown;
-
- void (*wait_for_sync)(void);
-};
-
-/* leave chip selected when we're done, for quicker re-select? */
-#if 0
-#define CS_CHANGE(xfer) ((xfer).cs_change = 1)
-#else
-#define CS_CHANGE(xfer) ((xfer).cs_change = 0)
-#endif
-
-/*--------------------------------------------------------------------------*/
-
-/* The xpt2046 has touchscreen and other sensors.
- * Earlier xpt2046 chips are somewhat compatible.
- */
-#define XPT2046_START (1 << 7)
-#define XPT2046_A2A1A0_d_y (1 << 4) /* differential */
-#define XPT2046_A2A1A0_d_z1 (3 << 4) /* differential */
-#define XPT2046_A2A1A0_d_z2 (4 << 4) /* differential */
-#define XPT2046_A2A1A0_d_x (5 << 4) /* differential */
-#define XPT2046_A2A1A0_temp0 (0 << 4) /* non-differential */
-#define XPT2046_A2A1A0_vbatt (2 << 4) /* non-differential */
-#define XPT2046_A2A1A0_vaux (6 << 4) /* non-differential */
-#define XPT2046_A2A1A0_temp1 (7 << 4) /* non-differential */
-#define XPT2046_8_BIT (1 << 3)
-#define XPT2046_12_BIT (0 << 3)
-#define XPT2046_SER (1 << 2) /* non-differential */
-#define XPT2046_DFR (0 << 2) /* differential */
-#define XPT2046_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */
-#define XPT2046_PD10_ADC_ON (1 << 0) /* ADC on */
-#define XPT2046_PD10_REF_ON (2 << 0) /* vREF on + penirq */
-#define XPT2046_PD10_ALL_ON (3 << 0) /* ADC + vREF on */
-
-#define MAX_12BIT ((1<<12)-1)
-
-/* leave ADC powered up (disables penirq) between differential samples */
-#define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
- | XPT2046_12_BIT | XPT2046_DFR | \
- (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
-
-#define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref))
-#define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref))
-#define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref))
-
-#define READ_X(vref) (READ_12BIT_DFR(x, 1, vref))
-#define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */
-
-/* single-ended samples need to first power up reference voltage;
- * we leave both ADC and VREF powered
- */
-#define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
- | XPT2046_12_BIT | XPT2046_SER)
-
-#define REF_ON (READ_12BIT_DFR(x, 1, 1))
-#define REF_OFF (READ_12BIT_DFR(y, 0, 0))
-
-/*--------------------------------------------------------------------------*/
-/*
- * touchscreen sensors use differential conversions.
- */
-
-struct dfr_req {
- u8 command;
- u8 pwrdown;
- u16 dummy; /* for the pwrdown read */
- __be16 sample;
- struct spi_message msg;
- struct spi_transfer xfer[4];
-};
-
-static struct xpt2046_platform_data xpt2046_info = {
- .model = 2046,
- .keep_vref_on = 1,
- .swap_xy = 1,
- .x_min = 0,
- .x_max = 800,
- .y_min = 0,
- .y_max = 480,
- .debounce_max = 7,
- .debounce_rep = DEBOUNCE_REPTIME,
- .debounce_tol = 20,
- .gpio_pendown = RK2818_PIN_PE3,
-
-};
-static void xpt2046_enable(struct xpt2046 *ts);
-static void xpt2046_disable(struct xpt2046 *ts);
-
-static int device_suspended(struct device *dev)
-{
- struct xpt2046 *ts = dev_get_drvdata(dev);
- return ts->is_suspended || ts->disabled;
-}
-
-static int xpt2046_read12_dfr(struct device *dev, unsigned command)
-{
- struct spi_device *spi = to_spi_device(dev);
- struct xpt2046 *ts = dev_get_drvdata(dev);
- struct dfr_req *req = kzalloc(sizeof *req, GFP_KERNEL);
- int status;
-
- if (!req)
- return -ENOMEM;
-
- spi_message_init(&req->msg);
-
- /* take sample */
- req->command = (u8) command;
- req->xfer[0].tx_buf = &req->command;
- req->xfer[0].len = 1;
- spi_message_add_tail(&req->xfer[0], &req->msg);
-
- req->xfer[1].rx_buf = &req->sample;
- req->xfer[1].len = 2;
- spi_message_add_tail(&req->xfer[1], &req->msg);
-
- /* converter in low power mode & enable PENIRQ */
- req->pwrdown= PWRDOWN;
- req->xfer[2].tx_buf = &req->pwrdown;
- req->xfer[2].len = 1;
- spi_message_add_tail(&req->xfer[2], &req->msg);
-
- req->xfer[3].rx_buf = &req->dummy;
- req->xfer[3].len = 2;
- CS_CHANGE(req->xfer[3]);
- spi_message_add_tail(&req->xfer[3], &req->msg);
-
- ts->irq_disabled = 1;
- disable_irq(spi->irq);
- status = spi_sync(spi, &req->msg);
- ts->irq_disabled = 0;
- enable_irq(spi->irq);
-
- if (status == 0) {
- /* on-wire is a must-ignore bit, a BE12 value, then padding */
- status = be16_to_cpu(req->sample);
- status = status >> 3;
- status &= 0x0fff;
- printk("***>%s:status=%d\n",__FUNCTION__,status);
- }
-
- kfree(req);
- return status;
-}
-
-
-
-/*--------------------------------------------------------------------------*/
-
-static int get_pendown_state(struct xpt2046 *ts)
-{
- if (ts->get_pendown_state)
- return ts->get_pendown_state();
-
- return !gpio_get_value(ts->gpio_pendown);
-}
-
-static void null_wait_for_sync(void)
-{
-
-}
-
-/*
- * PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
- * to retrieve touchscreen status.
- *
- * The SPI transfer completion callback does the real work. It reports
- * touchscreen events and reactivates the timer (or IRQ) as appropriate.
- */
-
-static void xpt2046_rx(void *xpt)
-{
- struct xpt2046 *ts = xpt;
- struct xpt2046_packet *packet = ts->packet;
- unsigned Rt = 1;
- u16 x, y;
-
- /* xpt2046_rx_val() did in-place conversion (including byteswap) from
- * on-the-wire format as part of debouncing to get stable readings.
- */
- x = packet->tc.x;
- y = packet->tc.y;
-
- xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
-
- /* range filtering */
- if (x == MAX_12BIT)
- x = 0;
-
- /* Sample found inconsistent by debouncing or pressure is beyond
- * the maximum. Don't report it to user space, repeat at least
- * once more the measurement
- */
- if (packet->tc.ignore) {
-
- xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
-
- hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
- HRTIMER_MODE_REL);
- return;
- }
-
- /* Maybe check the pendown state before reporting. This discards
- * false readings when the pen is lifted.
- */
- if (ts->penirq_recheck_delay_usecs) {
- udelay(ts->penirq_recheck_delay_usecs);
- if (!get_pendown_state(ts))
- {
- printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
- Rt = 0;
- }
- }
-
- /* NOTE: We can't rely on the pressure to determine the pen down
- * state, even this controller has a pressure sensor. The pressure
- * value can fluctuate for quite a while after lifting the pen and
- * in some cases may not even settle at the expected value.
- *
- * The only safe way to check for the pen up condition is in the
- * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
- */
- if (Rt) {
- struct input_dev *input = ts->input;
- if (!ts->pendown) {
- input_report_key(input, BTN_TOUCH, 1);
- ts->pendown = 1;
- printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
- }
-
- x = AD_TO_X(x);
- y = AD_TO_Y(y);
-
- if (ts->swap_xy)
- swap(x, y);
-
- input_report_abs(input, ABS_X, x);
- input_report_abs(input, ABS_Y, y);
-
- input_sync(input);
- xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,x, y);
- }
-
- hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
- HRTIMER_MODE_REL);
-}
-
-static int xpt2046_debounce(void *xpt, int data_idx, int *val)
-{
- struct xpt2046 *ts = xpt;
- static int average_val[2];
-
-
- xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
- data_idx,ts->last_read,
- ts->read_cnt,ts->debounce_max,
- abs(ts->last_read - *val),ts->debounce_tol,
- ts->read_rep,ts->debounce_rep);
-
- /* discard the first sample. */
- if(!ts->read_cnt)
- {
- udelay(100);
- ts->read_cnt++;
- return XPT2046_FILTER_REPEAT;
- }
-
- if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
- /* Start over collecting consistent readings. */
- ts->read_rep = 1;
- average_val[data_idx] = *val;
- /* Repeat it, if this was the first read or the read
- * wasn't consistent enough. */
- if (ts->read_cnt < ts->debounce_max) {
- ts->last_read = *val;
- ts->read_cnt++;
- return XPT2046_FILTER_REPEAT;
- } else {
- /* Maximum number of debouncing reached and still
- * not enough number of consistent readings. Abort
- * the whole sample, repeat it in the next sampling
- * period.
- */
- ts->read_cnt = 0;
- ts->last_read = 0;
- memset(average_val,0,sizeof(average_val));
- xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
- return XPT2046_FILTER_IGNORE;
- }
- }
- else {
- average_val[data_idx] += *val;
-
- if (++ts->read_rep >= ts->debounce_rep) {
- /* Got a good reading for this coordinate,
- * go for the next one. */
- ts->read_cnt = 0;
- ts->read_rep = 0;
- ts->last_read = 0;
- *val = average_val[data_idx]/(ts->debounce_rep);
- return XPT2046_FILTER_OK;
- } else {
- /* Read more values that are consistent. */
- ts->read_cnt++;
-
- return XPT2046_FILTER_REPEAT;
- }
- }
-}
-
-static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
-{
- return XPT2046_FILTER_OK;
-}
-
-static void xpt2046_rx_val(void *xpt)
-{
- struct xpt2046 *ts = xpt;
- struct xpt2046_packet *packet = ts->packet;
- struct spi_message *m;
- struct spi_transfer *t;
- int val;
- int action;
- int status;
-
- m = &ts->msg[ts->msg_idx];
- t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
-
- /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
- * built from two 8 bit values written msb-first.
- */
- val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
-
- xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
-
- action = ts->filter(ts->filter_data, ts->msg_idx, &val);
- switch (action) {
- case XPT2046_FILTER_REPEAT:
- break;
- case XPT2046_FILTER_IGNORE:
- packet->tc.ignore = 1;
- /* Last message will contain xpt2046_rx() as the
- * completion function.
- */
- m = ts->last_msg;
- break;
- case XPT2046_FILTER_OK:
- *(u16 *)t->rx_buf = val;
- packet->tc.ignore = 0;
- m = &ts->msg[++ts->msg_idx];
- break;
- default:
- BUG();
- }
- ts->wait_for_sync();
- status = spi_async(ts->spi, m);
- if (status)
- dev_err(&ts->spi->dev, "spi_async --> %d\n",
- status);
-}
-
-static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
-{
- struct xpt2046 *ts = container_of(handle, struct xpt2046, timer);
- int status = 0;
-
- spin_lock(&ts->lock);
-
- if (unlikely(!get_pendown_state(ts) ||
- device_suspended(&ts->spi->dev))) {
- if (ts->pendown) {
- struct input_dev *input = ts->input;
- input_report_key(input, BTN_TOUCH, 0);
- input_sync(input);
-
- ts->pendown = 0;
-
- printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
- }
-
- /* measurement cycle ended */
- if (!device_suspended(&ts->spi->dev)) {
- printk("***>%s:device_suspended==0\n",__FUNCTION__);
- ts->irq_disabled = 0;
- enable_irq(ts->spi->irq);
- }
- ts->pending = 0;
- } else {
- /* pen is still down, continue with the measurement */
- xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
- ts->msg_idx = 0;
- ts->wait_for_sync();
- status = spi_async(ts->spi, &ts->msg[0]);
- if (status)
- dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
- }
-
- spin_unlock(&ts->lock);
- return HRTIMER_NORESTART;
-}
-
-static irqreturn_t xpt2046_irq(int irq, void *handle)
-{
- struct xpt2046 *ts = handle;
- unsigned long flags;
-
- xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
-
- spin_lock_irqsave(&ts->lock, flags);
-
- if (likely(get_pendown_state(ts))) {
- if (!ts->irq_disabled) {
- /* The ARM do_simple_IRQ() dispatcher doesn't act
- * like the other dispatchers: it will report IRQs
- * even after they've been disabled. We work around
- * that here. (The "generic irq" framework may help...)
- */
- ts->irq_disabled = 1;
- disable_irq_nosync(ts->spi->irq);
- ts->pending = 1;
- hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
- HRTIMER_MODE_REL);
- }
- }
- spin_unlock_irqrestore(&ts->lock, flags);
-
- return IRQ_HANDLED;
-}
-
-/*--------------------------------------------------------------------------*/
-
-/* Must be called with ts->lock held */
-static void xpt2046_disable(struct xpt2046 *ts)
-{
- if (ts->disabled)
- return;
-
- ts->disabled = 1;
-
- /* are we waiting for IRQ, or polling? */
- if (!ts->pending) {
- ts->irq_disabled = 1;
- disable_irq(ts->spi->irq);
- } else {
- /* the timer will run at least once more, and
- * leave everything in a clean state, IRQ disabled
- */
- while (ts->pending) {
- spin_unlock_irq(&ts->lock);
- msleep(1);
- spin_lock_irq(&ts->lock);
- }
- }
-
- /* we know the chip's in lowpower mode since we always
- * leave it that way after every request
- */
-}
-
-/* Must be called with ts->lock held */
-static void xpt2046_enable(struct xpt2046 *ts)
-{
- if (!ts->disabled)
- return;
-
- ts->disabled = 0;
- ts->irq_disabled = 0;
- enable_irq(ts->spi->irq);
-}
-
-static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
-{
- struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
-
- spin_lock_irq(&ts->lock);
-
- ts->is_suspended = 1;
- xpt2046_disable(ts);
-
- spin_unlock_irq(&ts->lock);
-
- return 0;
-
-}
-
-static int xpt2046_resume(struct spi_device *spi)
-{
- struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
-
- spin_lock_irq(&ts->lock);
-
- ts->is_suspended = 0;
- xpt2046_enable(ts);
-
- spin_unlock_irq(&ts->lock);
-
- return 0;
-}
-
-static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
-{
- struct xpt2046_platform_data *pdata = spi->dev.platform_data;
- int err;
-
- /* REVISIT when the irq can be triggered active-low, or if for some
- * reason the touchscreen isn't hooked up, we don't need to access
- * the pendown state.
- */
- if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
- dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
- return -EINVAL;
- }
-
- if (pdata->get_pendown_state) {
- ts->get_pendown_state = pdata->get_pendown_state;
- return 0;
- }
-
- err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
- if (err) {
- dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
- pdata->gpio_pendown);
- return err;
- }
-
- ts->gpio_pendown = pdata->gpio_pendown;
- return 0;
-}
-
-static int __devinit xpt2046_probe(struct spi_device *spi)
-{
- struct xpt2046 *ts;
- struct xpt2046_packet *packet;
- struct input_dev *input_dev;
- struct xpt2046_platform_data *pdata = spi->dev.platform_data;
- struct spi_message *m;
- struct spi_transfer *x;
- int vref;
- int err;
-
-
-
- if (!spi->irq) {
- dev_dbg(&spi->dev, "no IRQ?\n");
- return -ENODEV;
- }
- else{
- spi->irq = gpio_to_irq(spi->irq);
- dev_dbg(&spi->dev, "no IRQ?\n");
- }
-
- if (!pdata) {
- spi->dev.platform_data = &xpt2046_info;
- pdata = spi->dev.platform_data;
- }
-
- /* don't exceed max specified sample rate */
- if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
- dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
- (spi->max_speed_hz/SAMPLE_BITS)/1000);
- return -EINVAL;
- }
-
- /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
- * that even if the hardware can do that, the SPI controller driver
- * may not. So we stick to very-portable 8 bit words, both RX and TX.
- */
- spi->bits_per_word = 8;
- spi->mode = SPI_MODE_0;
- err = spi_setup(spi);
- if (err < 0)
- return err;
-
- ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
- packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
- input_dev = input_allocate_device();
- if (!ts || !packet || !input_dev) {
- err = -ENOMEM;
- goto err_free_mem;
- }
-
- dev_set_drvdata(&spi->dev, ts);
-
- ts->packet = packet;
- ts->spi = spi;
- ts->input = input_dev;
- ts->swap_xy = pdata->swap_xy;
-
- hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- ts->timer.function = xpt2046_timer;
-
- spin_lock_init(&ts->lock);
-
- ts->model = pdata->model ? : 2046;
-
- if (pdata->filter != NULL) {
- if (pdata->filter_init != NULL) {
- err = pdata->filter_init(pdata, &ts->filter_data);
- if (err < 0)
- goto err_free_mem;
- }
- ts->filter = pdata->filter;
- ts->filter_cleanup = pdata->filter_cleanup;
- } else if (pdata->debounce_max) {
- ts->debounce_max = pdata->debounce_max;
- if (ts->debounce_max < DEBOUNCE_REPTIME)
- ts->debounce_max = DEBOUNCE_REPTIME;
- ts->debounce_tol = pdata->debounce_tol;
- ts->debounce_rep = pdata->debounce_rep;
- ts->filter = xpt2046_debounce;
- ts->filter_data = ts;
- } else
- ts->filter = xpt2046_no_filter;
-
- err = setup_pendown(spi, ts);
- if (err)
- goto err_cleanup_filter;
-
- if (pdata->penirq_recheck_delay_usecs)
- ts->penirq_recheck_delay_usecs =
- pdata->penirq_recheck_delay_usecs;
-
- ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
-
- snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
- snprintf(ts->name, sizeof(ts->name), "XPT%d Touchscreen", ts->model);
-
- input_dev->name = ts->name;
- input_dev->phys = ts->phys;
- input_dev->dev.parent = &spi->dev;
-
- input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
- input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
- input_set_abs_params(input_dev, ABS_X,
- pdata->x_min ? : 0,
- pdata->x_max ? : MAX_12BIT,
- 0, 0);
- input_set_abs_params(input_dev, ABS_Y,
- pdata->y_min ? : 0,
- pdata->y_max ? : MAX_12BIT,
- 0, 0);
-
- vref = pdata->keep_vref_on;
-
- /* set up the transfers to read touchscreen state; this assumes we
- * use formula #2 for pressure, not #3.
- */
- m = &ts->msg[0];
- x = ts->xfer;
-
- spi_message_init(m);
-
- /* y- still on; turn on only y+ (and ADC) */
- packet->read_y = READ_Y(vref);
- x->tx_buf = &packet->read_y;
- x->len = 1;
- spi_message_add_tail(x, m);
-
- x++;
- x->rx_buf = &packet->tc.y;
- x->len = 2;
- spi_message_add_tail(x, m);
-
- m->complete = xpt2046_rx_val;
- m->context = ts;
-
- m++;
- spi_message_init(m);
-
- /* turn y- off, x+ on, then leave in lowpower */
- x++;
- packet->read_x = READ_X(vref);
- x->tx_buf = &packet->read_x;
- x->len = 1;
- spi_message_add_tail(x, m);
-
- x++;
- x->rx_buf = &packet->tc.x;
- x->len = 2;
- spi_message_add_tail(x, m);
-
- m->complete = xpt2046_rx_val;
- m->context = ts;
-
- /* power down */
- m++;
- spi_message_init(m);
-
- x++;
- packet->pwrdown = PWRDOWN;
- x->tx_buf = &packet->pwrdown;
- x->len = 1;
- spi_message_add_tail(x, m);
-
- x++;
- x->rx_buf = &packet->dummy;
- x->len = 2;
- CS_CHANGE(*x);
- spi_message_add_tail(x, m);
-
- m->complete = xpt2046_rx;
- m->context = ts;
-
- ts->last_msg = m;
-
- if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
- spi->dev.driver->name, ts)) {
- printk("***>%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
- err = request_irq(spi->irq, xpt2046_irq,
- IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
- spi->dev.driver->name, ts);
- if (err) {
- dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
- goto err_free_gpio;
- }
- }
- printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
-
- /* take a first sample, leaving nPENIRQ active and vREF off; avoid
- * the touchscreen, in case it's not connected.
- */
- xpt2046_read12_dfr(&spi->dev,READ_X(1));
-
- err = input_register_device(input_dev);
- if (err)
- goto err_remove_attr_group;
-
- return 0;
-
- err_remove_attr_group:
- free_irq(spi->irq, ts);
- err_free_gpio:
- if (ts->gpio_pendown != -1)
- gpio_free(ts->gpio_pendown);
- err_cleanup_filter:
- if (ts->filter_cleanup)
- ts->filter_cleanup(ts->filter_data);
- err_free_mem:
- input_free_device(input_dev);
- kfree(packet);
- kfree(ts);
- return err;
-}
-
-static int __devexit xpt2046_remove(struct spi_device *spi)
-{
- struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
-
- input_unregister_device(ts->input);
-
- xpt2046_suspend(spi, PMSG_SUSPEND);
-
- free_irq(ts->spi->irq, ts);
- /* suspend left the IRQ disabled */
- enable_irq(ts->spi->irq);
-
- if (ts->gpio_pendown != -1)
- gpio_free(ts->gpio_pendown);
-
- if (ts->filter_cleanup)
- ts->filter_cleanup(ts->filter_data);
-
- kfree(ts->packet);
- kfree(ts);
-
- dev_dbg(&spi->dev, "unregistered touchscreen\n");
- return 0;
-}
-
-static struct spi_driver xpt2046_driver = {
- .driver = {
- .name = "xpt2046_ts",
- .bus = &spi_bus_type,
- .owner = THIS_MODULE,
- },
- .probe = xpt2046_probe,
- .remove = __devexit_p(xpt2046_remove),
- .suspend = xpt2046_suspend,
- .resume = xpt2046_resume,
-};
-
-static int __init xpt2046_init(void)
-{
- return spi_register_driver(&xpt2046_driver);
-}
-module_init(xpt2046_init);
-
-static void __exit xpt2046_exit(void)
-{
- spi_unregister_driver(&xpt2046_driver);
-}
-module_exit(xpt2046_exit);
-
-MODULE_DESCRIPTION("rk2818 spi xpt2046 TouchScreen Driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("spi:xpt2046");
projects / firefly-linux-kernel-4.4.55.git / commitdiff