682 lines
17 KiB
C
682 lines
17 KiB
C
/*
|
|
* AD7879/AD7889 based touchscreen and GPIO driver
|
|
*
|
|
* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*
|
|
* History:
|
|
* Copyright (c) 2005 David Brownell
|
|
* Copyright (c) 2006 Nokia Corporation
|
|
* Various changes: Imre Deak <imre.deak@nokia.com>
|
|
*
|
|
* Using code from:
|
|
* - corgi_ts.c
|
|
* Copyright (C) 2004-2005 Richard Purdie
|
|
* - omap_ts.[hc], ads7846.h, ts_osk.c
|
|
* Copyright (C) 2002 MontaVista Software
|
|
* Copyright (C) 2004 Texas Instruments
|
|
* Copyright (C) 2005 Dirk Behme
|
|
* - ad7877.c
|
|
* Copyright (C) 2006-2008 Analog Devices Inc.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/input.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include <linux/input/touchscreen.h>
|
|
#include <linux/platform_data/ad7879.h>
|
|
#include <linux/module.h>
|
|
#include "ad7879.h"
|
|
|
|
#define AD7879_REG_ZEROS 0
|
|
#define AD7879_REG_CTRL1 1
|
|
#define AD7879_REG_CTRL2 2
|
|
#define AD7879_REG_CTRL3 3
|
|
#define AD7879_REG_AUX1HIGH 4
|
|
#define AD7879_REG_AUX1LOW 5
|
|
#define AD7879_REG_TEMP1HIGH 6
|
|
#define AD7879_REG_TEMP1LOW 7
|
|
#define AD7879_REG_XPLUS 8
|
|
#define AD7879_REG_YPLUS 9
|
|
#define AD7879_REG_Z1 10
|
|
#define AD7879_REG_Z2 11
|
|
#define AD7879_REG_AUXVBAT 12
|
|
#define AD7879_REG_TEMP 13
|
|
#define AD7879_REG_REVID 14
|
|
|
|
/* Control REG 1 */
|
|
#define AD7879_TMR(x) ((x & 0xFF) << 0)
|
|
#define AD7879_ACQ(x) ((x & 0x3) << 8)
|
|
#define AD7879_MODE_NOC (0 << 10) /* Do not convert */
|
|
#define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */
|
|
#define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */
|
|
#define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */
|
|
#define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */
|
|
|
|
/* Control REG 2 */
|
|
#define AD7879_FCD(x) ((x & 0x3) << 0)
|
|
#define AD7879_RESET (1 << 4)
|
|
#define AD7879_MFS(x) ((x & 0x3) << 5)
|
|
#define AD7879_AVG(x) ((x & 0x3) << 7)
|
|
#define AD7879_SER (1 << 9) /* non-differential */
|
|
#define AD7879_DFR (0 << 9) /* differential */
|
|
#define AD7879_GPIOPOL (1 << 10)
|
|
#define AD7879_GPIODIR (1 << 11)
|
|
#define AD7879_GPIO_DATA (1 << 12)
|
|
#define AD7879_GPIO_EN (1 << 13)
|
|
#define AD7879_PM(x) ((x & 0x3) << 14)
|
|
#define AD7879_PM_SHUTDOWN (0)
|
|
#define AD7879_PM_DYN (1)
|
|
#define AD7879_PM_FULLON (2)
|
|
|
|
/* Control REG 3 */
|
|
#define AD7879_TEMPMASK_BIT (1<<15)
|
|
#define AD7879_AUXVBATMASK_BIT (1<<14)
|
|
#define AD7879_INTMODE_BIT (1<<13)
|
|
#define AD7879_GPIOALERTMASK_BIT (1<<12)
|
|
#define AD7879_AUXLOW_BIT (1<<11)
|
|
#define AD7879_AUXHIGH_BIT (1<<10)
|
|
#define AD7879_TEMPLOW_BIT (1<<9)
|
|
#define AD7879_TEMPHIGH_BIT (1<<8)
|
|
#define AD7879_YPLUS_BIT (1<<7)
|
|
#define AD7879_XPLUS_BIT (1<<6)
|
|
#define AD7879_Z1_BIT (1<<5)
|
|
#define AD7879_Z2_BIT (1<<4)
|
|
#define AD7879_AUX_BIT (1<<3)
|
|
#define AD7879_VBAT_BIT (1<<2)
|
|
#define AD7879_TEMP_BIT (1<<1)
|
|
|
|
enum {
|
|
AD7879_SEQ_YPOS = 0,
|
|
AD7879_SEQ_XPOS = 1,
|
|
AD7879_SEQ_Z1 = 2,
|
|
AD7879_SEQ_Z2 = 3,
|
|
AD7879_NR_SENSE = 4,
|
|
};
|
|
|
|
#define MAX_12BIT ((1<<12)-1)
|
|
#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
|
|
|
|
struct ad7879 {
|
|
const struct ad7879_bus_ops *bops;
|
|
|
|
struct device *dev;
|
|
struct input_dev *input;
|
|
struct timer_list timer;
|
|
#ifdef CONFIG_GPIOLIB
|
|
struct gpio_chip gc;
|
|
struct mutex mutex;
|
|
#endif
|
|
unsigned int irq;
|
|
bool disabled; /* P: input->mutex */
|
|
bool suspended; /* P: input->mutex */
|
|
bool swap_xy;
|
|
u16 conversion_data[AD7879_NR_SENSE];
|
|
char phys[32];
|
|
u8 first_conversion_delay;
|
|
u8 acquisition_time;
|
|
u8 averaging;
|
|
u8 pen_down_acc_interval;
|
|
u8 median;
|
|
u16 x_plate_ohms;
|
|
u16 cmd_crtl1;
|
|
u16 cmd_crtl2;
|
|
u16 cmd_crtl3;
|
|
int x;
|
|
int y;
|
|
int Rt;
|
|
};
|
|
|
|
static int ad7879_read(struct ad7879 *ts, u8 reg)
|
|
{
|
|
return ts->bops->read(ts->dev, reg);
|
|
}
|
|
|
|
static int ad7879_multi_read(struct ad7879 *ts, u8 first_reg, u8 count, u16 *buf)
|
|
{
|
|
return ts->bops->multi_read(ts->dev, first_reg, count, buf);
|
|
}
|
|
|
|
static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
|
|
{
|
|
return ts->bops->write(ts->dev, reg, val);
|
|
}
|
|
|
|
static int ad7879_report(struct ad7879 *ts)
|
|
{
|
|
struct input_dev *input_dev = ts->input;
|
|
unsigned Rt;
|
|
u16 x, y, z1, z2;
|
|
|
|
x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
|
|
y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
|
|
z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
|
|
z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
|
|
|
|
if (ts->swap_xy)
|
|
swap(x, y);
|
|
|
|
/*
|
|
* The samples processed here are already preprocessed by the AD7879.
|
|
* The preprocessing function consists of a median and an averaging
|
|
* filter. The combination of these two techniques provides a robust
|
|
* solution, discarding the spurious noise in the signal and keeping
|
|
* only the data of interest. The size of both filters is
|
|
* programmable. (dev.platform_data, see linux/platform_data/ad7879.h)
|
|
* Other user-programmable conversion controls include variable
|
|
* acquisition time, and first conversion delay. Up to 16 averages can
|
|
* be taken per conversion.
|
|
*/
|
|
|
|
if (likely(x && z1)) {
|
|
/* compute touch pressure resistance using equation #1 */
|
|
Rt = (z2 - z1) * x * ts->x_plate_ohms;
|
|
Rt /= z1;
|
|
Rt = (Rt + 2047) >> 12;
|
|
|
|
/*
|
|
* Sample found inconsistent, pressure is beyond
|
|
* the maximum. Don't report it to user space.
|
|
*/
|
|
if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Note that we delay reporting events by one sample.
|
|
* This is done to avoid reporting last sample of the
|
|
* touch sequence, which may be incomplete if finger
|
|
* leaves the surface before last reading is taken.
|
|
*/
|
|
if (timer_pending(&ts->timer)) {
|
|
/* Touch continues */
|
|
input_report_key(input_dev, BTN_TOUCH, 1);
|
|
input_report_abs(input_dev, ABS_X, ts->x);
|
|
input_report_abs(input_dev, ABS_Y, ts->y);
|
|
input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
|
|
input_sync(input_dev);
|
|
}
|
|
|
|
ts->x = x;
|
|
ts->y = y;
|
|
ts->Rt = Rt;
|
|
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void ad7879_ts_event_release(struct ad7879 *ts)
|
|
{
|
|
struct input_dev *input_dev = ts->input;
|
|
|
|
input_report_abs(input_dev, ABS_PRESSURE, 0);
|
|
input_report_key(input_dev, BTN_TOUCH, 0);
|
|
input_sync(input_dev);
|
|
}
|
|
|
|
static void ad7879_timer(unsigned long handle)
|
|
{
|
|
struct ad7879 *ts = (void *)handle;
|
|
|
|
ad7879_ts_event_release(ts);
|
|
}
|
|
|
|
static irqreturn_t ad7879_irq(int irq, void *handle)
|
|
{
|
|
struct ad7879 *ts = handle;
|
|
|
|
ad7879_multi_read(ts, AD7879_REG_XPLUS, AD7879_NR_SENSE, ts->conversion_data);
|
|
|
|
if (!ad7879_report(ts))
|
|
mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void __ad7879_enable(struct ad7879 *ts)
|
|
{
|
|
ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
|
|
ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
|
|
ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
|
|
|
|
enable_irq(ts->irq);
|
|
}
|
|
|
|
static void __ad7879_disable(struct ad7879 *ts)
|
|
{
|
|
u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) |
|
|
AD7879_PM(AD7879_PM_SHUTDOWN);
|
|
disable_irq(ts->irq);
|
|
|
|
if (del_timer_sync(&ts->timer))
|
|
ad7879_ts_event_release(ts);
|
|
|
|
ad7879_write(ts, AD7879_REG_CTRL2, reg);
|
|
}
|
|
|
|
|
|
static int ad7879_open(struct input_dev *input)
|
|
{
|
|
struct ad7879 *ts = input_get_drvdata(input);
|
|
|
|
/* protected by input->mutex */
|
|
if (!ts->disabled && !ts->suspended)
|
|
__ad7879_enable(ts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ad7879_close(struct input_dev* input)
|
|
{
|
|
struct ad7879 *ts = input_get_drvdata(input);
|
|
|
|
/* protected by input->mutex */
|
|
if (!ts->disabled && !ts->suspended)
|
|
__ad7879_disable(ts);
|
|
}
|
|
|
|
static int __maybe_unused ad7879_suspend(struct device *dev)
|
|
{
|
|
struct ad7879 *ts = dev_get_drvdata(dev);
|
|
|
|
mutex_lock(&ts->input->mutex);
|
|
|
|
if (!ts->suspended && !ts->disabled && ts->input->users)
|
|
__ad7879_disable(ts);
|
|
|
|
ts->suspended = true;
|
|
|
|
mutex_unlock(&ts->input->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused ad7879_resume(struct device *dev)
|
|
{
|
|
struct ad7879 *ts = dev_get_drvdata(dev);
|
|
|
|
mutex_lock(&ts->input->mutex);
|
|
|
|
if (ts->suspended && !ts->disabled && ts->input->users)
|
|
__ad7879_enable(ts);
|
|
|
|
ts->suspended = false;
|
|
|
|
mutex_unlock(&ts->input->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume);
|
|
EXPORT_SYMBOL(ad7879_pm_ops);
|
|
|
|
static void ad7879_toggle(struct ad7879 *ts, bool disable)
|
|
{
|
|
mutex_lock(&ts->input->mutex);
|
|
|
|
if (!ts->suspended && ts->input->users != 0) {
|
|
|
|
if (disable) {
|
|
if (ts->disabled)
|
|
__ad7879_enable(ts);
|
|
} else {
|
|
if (!ts->disabled)
|
|
__ad7879_disable(ts);
|
|
}
|
|
}
|
|
|
|
ts->disabled = disable;
|
|
|
|
mutex_unlock(&ts->input->mutex);
|
|
}
|
|
|
|
static ssize_t ad7879_disable_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ad7879 *ts = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%u\n", ts->disabled);
|
|
}
|
|
|
|
static ssize_t ad7879_disable_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ad7879 *ts = dev_get_drvdata(dev);
|
|
unsigned int val;
|
|
int error;
|
|
|
|
error = kstrtouint(buf, 10, &val);
|
|
if (error)
|
|
return error;
|
|
|
|
ad7879_toggle(ts, val);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
|
|
|
|
static struct attribute *ad7879_attributes[] = {
|
|
&dev_attr_disable.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group ad7879_attr_group = {
|
|
.attrs = ad7879_attributes,
|
|
};
|
|
|
|
#ifdef CONFIG_GPIOLIB
|
|
static int ad7879_gpio_direction_input(struct gpio_chip *chip,
|
|
unsigned gpio)
|
|
{
|
|
struct ad7879 *ts = container_of(chip, struct ad7879, gc);
|
|
int err;
|
|
|
|
mutex_lock(&ts->mutex);
|
|
ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL;
|
|
err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ad7879_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned gpio, int level)
|
|
{
|
|
struct ad7879 *ts = container_of(chip, struct ad7879, gc);
|
|
int err;
|
|
|
|
mutex_lock(&ts->mutex);
|
|
ts->cmd_crtl2 &= ~AD7879_GPIODIR;
|
|
ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL;
|
|
if (level)
|
|
ts->cmd_crtl2 |= AD7879_GPIO_DATA;
|
|
else
|
|
ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
|
|
|
|
err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
struct ad7879 *ts = container_of(chip, struct ad7879, gc);
|
|
u16 val;
|
|
|
|
mutex_lock(&ts->mutex);
|
|
val = ad7879_read(ts, AD7879_REG_CTRL2);
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return !!(val & AD7879_GPIO_DATA);
|
|
}
|
|
|
|
static void ad7879_gpio_set_value(struct gpio_chip *chip,
|
|
unsigned gpio, int value)
|
|
{
|
|
struct ad7879 *ts = container_of(chip, struct ad7879, gc);
|
|
|
|
mutex_lock(&ts->mutex);
|
|
if (value)
|
|
ts->cmd_crtl2 |= AD7879_GPIO_DATA;
|
|
else
|
|
ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
|
|
|
|
ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
|
|
mutex_unlock(&ts->mutex);
|
|
}
|
|
|
|
static int ad7879_gpio_add(struct ad7879 *ts,
|
|
const struct ad7879_platform_data *pdata)
|
|
{
|
|
int ret = 0;
|
|
|
|
mutex_init(&ts->mutex);
|
|
|
|
if (pdata->gpio_export) {
|
|
ts->gc.direction_input = ad7879_gpio_direction_input;
|
|
ts->gc.direction_output = ad7879_gpio_direction_output;
|
|
ts->gc.get = ad7879_gpio_get_value;
|
|
ts->gc.set = ad7879_gpio_set_value;
|
|
ts->gc.can_sleep = 1;
|
|
ts->gc.base = pdata->gpio_base;
|
|
ts->gc.ngpio = 1;
|
|
ts->gc.label = "AD7879-GPIO";
|
|
ts->gc.owner = THIS_MODULE;
|
|
ts->gc.parent = ts->dev;
|
|
|
|
ret = gpiochip_add(&ts->gc);
|
|
if (ret)
|
|
dev_err(ts->dev, "failed to register gpio %d\n",
|
|
ts->gc.base);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ad7879_gpio_remove(struct ad7879 *ts)
|
|
{
|
|
const struct ad7879_platform_data *pdata = dev_get_platdata(ts->dev);
|
|
|
|
if (pdata && pdata->gpio_export)
|
|
gpiochip_remove(&ts->gc);
|
|
|
|
}
|
|
#else
|
|
static inline int ad7879_gpio_add(struct ad7879 *ts,
|
|
const struct ad7879_platform_data *pdata)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ad7879_gpio_remove(struct ad7879 *ts)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts)
|
|
{
|
|
int err;
|
|
u32 tmp;
|
|
|
|
err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp);
|
|
if (err) {
|
|
dev_err(dev, "failed to get resistance-plate-x property\n");
|
|
return err;
|
|
}
|
|
ts->x_plate_ohms = (u16)tmp;
|
|
|
|
device_property_read_u8(dev, "adi,first-conversion-delay",
|
|
&ts->first_conversion_delay);
|
|
device_property_read_u8(dev, "adi,acquisition-time",
|
|
&ts->acquisition_time);
|
|
device_property_read_u8(dev, "adi,median-filter-size", &ts->median);
|
|
device_property_read_u8(dev, "adi,averaging", &ts->averaging);
|
|
device_property_read_u8(dev, "adi,conversion-interval",
|
|
&ts->pen_down_acc_interval);
|
|
|
|
ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y");
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
|
|
const struct ad7879_bus_ops *bops)
|
|
{
|
|
struct ad7879_platform_data *pdata = dev_get_platdata(dev);
|
|
struct ad7879 *ts;
|
|
struct input_dev *input_dev;
|
|
int err;
|
|
u16 revid;
|
|
|
|
if (!irq) {
|
|
dev_err(dev, "No IRQ specified\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
|
|
if (!ts)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (pdata) {
|
|
/* Platform data use swapped axis (backward compatibility) */
|
|
ts->swap_xy = !pdata->swap_xy;
|
|
|
|
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
|
|
|
|
ts->first_conversion_delay = pdata->first_conversion_delay;
|
|
ts->acquisition_time = pdata->acquisition_time;
|
|
ts->averaging = pdata->averaging;
|
|
ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
|
|
ts->median = pdata->median;
|
|
} else if (dev->of_node) {
|
|
ad7879_parse_dt(dev, ts);
|
|
} else {
|
|
dev_err(dev, "No platform data\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
input_dev = devm_input_allocate_device(dev);
|
|
if (!input_dev) {
|
|
dev_err(dev, "Failed to allocate input device\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
ts->bops = bops;
|
|
ts->dev = dev;
|
|
ts->input = input_dev;
|
|
ts->irq = irq;
|
|
|
|
setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
|
|
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
|
|
|
|
input_dev->name = "AD7879 Touchscreen";
|
|
input_dev->phys = ts->phys;
|
|
input_dev->dev.parent = dev;
|
|
input_dev->id.bustype = bops->bustype;
|
|
|
|
input_dev->open = ad7879_open;
|
|
input_dev->close = ad7879_close;
|
|
|
|
input_set_drvdata(input_dev, ts);
|
|
|
|
__set_bit(EV_ABS, input_dev->evbit);
|
|
__set_bit(ABS_X, input_dev->absbit);
|
|
__set_bit(ABS_Y, input_dev->absbit);
|
|
__set_bit(ABS_PRESSURE, input_dev->absbit);
|
|
|
|
__set_bit(EV_KEY, input_dev->evbit);
|
|
__set_bit(BTN_TOUCH, input_dev->keybit);
|
|
|
|
if (pdata) {
|
|
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);
|
|
input_set_abs_params(input_dev, ABS_PRESSURE,
|
|
pdata->pressure_min,
|
|
pdata->pressure_max ? : ~0,
|
|
0, 0);
|
|
} else {
|
|
input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
|
|
input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
|
|
touchscreen_parse_properties(input_dev, false);
|
|
if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
|
|
dev_err(dev, "Touchscreen pressure is not specified\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
|
|
err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
|
|
if (err < 0) {
|
|
dev_err(dev, "Failed to write %s\n", input_dev->name);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
revid = ad7879_read(ts, AD7879_REG_REVID);
|
|
input_dev->id.product = (revid & 0xff);
|
|
input_dev->id.version = revid >> 8;
|
|
if (input_dev->id.product != devid) {
|
|
dev_err(dev, "Failed to probe %s (%x vs %x)\n",
|
|
input_dev->name, devid, revid);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
ts->cmd_crtl3 = AD7879_YPLUS_BIT |
|
|
AD7879_XPLUS_BIT |
|
|
AD7879_Z2_BIT |
|
|
AD7879_Z1_BIT |
|
|
AD7879_TEMPMASK_BIT |
|
|
AD7879_AUXVBATMASK_BIT |
|
|
AD7879_GPIOALERTMASK_BIT;
|
|
|
|
ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR |
|
|
AD7879_AVG(ts->averaging) |
|
|
AD7879_MFS(ts->median) |
|
|
AD7879_FCD(ts->first_conversion_delay);
|
|
|
|
ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 |
|
|
AD7879_ACQ(ts->acquisition_time) |
|
|
AD7879_TMR(ts->pen_down_acc_interval);
|
|
|
|
err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
dev_name(dev), ts);
|
|
if (err) {
|
|
dev_err(dev, "Failed to request IRQ: %d\n", err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
__ad7879_disable(ts);
|
|
|
|
err = sysfs_create_group(&dev->kobj, &ad7879_attr_group);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
if (pdata) {
|
|
err = ad7879_gpio_add(ts, pdata);
|
|
if (err)
|
|
goto err_remove_attr;
|
|
}
|
|
|
|
err = input_register_device(input_dev);
|
|
if (err)
|
|
goto err_remove_gpio;
|
|
|
|
return ts;
|
|
|
|
err_remove_gpio:
|
|
ad7879_gpio_remove(ts);
|
|
err_remove_attr:
|
|
sysfs_remove_group(&dev->kobj, &ad7879_attr_group);
|
|
err_out:
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(ad7879_probe);
|
|
|
|
void ad7879_remove(struct ad7879 *ts)
|
|
{
|
|
ad7879_gpio_remove(ts);
|
|
sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group);
|
|
}
|
|
EXPORT_SYMBOL(ad7879_remove);
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
|
|
MODULE_LICENSE("GPL");
|