[linux-2.6-block.git] / drivers / input / touchscreen / ad7879.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/property.h>
#include <linux/regmap.h>
#include <linux/slab.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 {
	struct regmap		*regmap;
	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)
{
	unsigned int val;
	int error;

	error = regmap_read(ts->regmap, reg, &val);
	if (error) {
		dev_err(ts->dev, "failed to read register %#02x: %d\n",
			reg, error);
		return error;
	}

	return val;
}

static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
{
	int error;

	error = regmap_write(ts->regmap, reg, val);
	if (error) {
		dev_err(ts->dev,
			"failed to write %#04x to register %#02x: %d\n",
			val, reg, error);
		return error;
	}

	return 0;
}

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;

	regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
			 ts->conversion_data, AD7879_NR_SENSE);

	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 = gpiochip_get_data(chip);
	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 = gpiochip_get_data(chip);
	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 = gpiochip_get_data(chip);
	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 = gpiochip_get_data(chip);

	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)
{
	bool gpio_export;
	int gpio_base;
	int ret = 0;

	if (pdata) {
		gpio_export = pdata->gpio_export;
		gpio_base = pdata->gpio_base;
	} else {
		gpio_export = device_property_read_bool(ts->dev,
							"gpio-controller");
		gpio_base = -1;
	}

	mutex_init(&ts->mutex);

	if (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 = gpio_base;
		ts->gc.ngpio = 1;
		ts->gc.label = "AD7879-GPIO";
		ts->gc.owner = THIS_MODULE;
		ts->gc.parent = ts->dev;

		ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
		if (ret)
			dev_err(ts->dev, "failed to register gpio %d\n",
				ts->gc.base);
	}

	return ret;
}
#else
static int ad7879_gpio_add(struct ad7879 *ts,
			   const struct ad7879_platform_data *pdata)
{
	return 0;
}
#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;
}

static void ad7879_cleanup_sysfs(void *_ts)
{
	struct ad7879 *ts = _ts;

	sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group);
}

int ad7879_probe(struct device *dev, struct regmap *regmap,
		 int irq, u16 bustype, u8 devid)
{
	struct ad7879_platform_data *pdata = dev_get_platdata(dev);
	struct ad7879 *ts;
	struct input_dev *input_dev;
	int err;
	u16 revid;

	if (irq <= 0) {
		dev_err(dev, "No IRQ specified\n");
		return -EINVAL;
	}

	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
	if (!ts)
		return -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 {
		err = ad7879_parse_dt(dev, ts);
		if (err)
			return err;
	}

	input_dev = devm_input_allocate_device(dev);
	if (!input_dev) {
		dev_err(dev, "Failed to allocate input device\n");
		return -ENOMEM;
	}

	ts->dev = dev;
	ts->input = input_dev;
	ts->irq = irq;
	ts->regmap = regmap;

	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 = bustype;

	input_dev->open = ad7879_open;
	input_dev->close = ad7879_close;

	input_set_drvdata(input_dev, ts);

	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);

	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);
		input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
		touchscreen_parse_properties(input_dev, false, NULL);
		if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
			dev_err(dev, "Touchscreen pressure is not specified\n");
			return -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;
	}

	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 -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;
	}

	__ad7879_disable(ts);

	err = sysfs_create_group(&dev->kobj, &ad7879_attr_group);
	if (err)
		return err;

	err = devm_add_action_or_reset(dev, ad7879_cleanup_sysfs, ts);
	if (err)
		return err;

	err = ad7879_gpio_add(ts, pdata);
	if (err)
		return err;

	err = input_register_device(input_dev);
	if (err)
		return err;

	dev_set_drvdata(dev, ts);

	return 0;
}
EXPORT_SYMBOL(ad7879_probe);

MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
b4be468c	1	/*
4397c98a	2	* AD7879/AD7889 based touchscreen and GPIO driver
b4be468c	3	*
4397c98a	4	* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
b4be468c	5	*
4397c98a	6	* Licensed under the GPL-2 or later.
b4be468c MH	7	*
	8	* History:
	9	* Copyright (c) 2005 David Brownell
	10	* Copyright (c) 2006 Nokia Corporation
	11	* Various changes: Imre Deak <imre.deak@nokia.com>
	12	*
	13	* Using code from:
	14	* - corgi_ts.c
	15	* Copyright (C) 2004-2005 Richard Purdie
	16	* - omap_ts.[hc], ads7846.h, ts_osk.c
	17	* Copyright (C) 2002 MontaVista Software
	18	* Copyright (C) 2004 Texas Instruments
	19	* Copyright (C) 2005 Dirk Behme
	20	* - ad7877.c
	21	* Copyright (C) 2006-2008 Analog Devices Inc.
	22	*/
	23
	24	#include <linux/device.h>
b4be468c MH	25	#include <linux/delay.h>
	26	#include <linux/input.h>
	27	#include <linux/interrupt.h>
	28	#include <linux/irq.h>
a4deb147	29	#include <linux/property.h>
404a24c3	30	#include <linux/regmap.h>
b4be468c	31	#include <linux/slab.h>
ec51b7f5	32	#include <linux/gpio.h>
b4be468c	33
fa6e3ca2	34	#include <linux/input/touchscreen.h>
4774f400	35	#include <linux/platform_data/ad7879.h>
d2d8442d	36	#include <linux/module.h>
4397c98a	37	#include "ad7879.h"
b4be468c MH	38
	39	#define AD7879_REG_ZEROS 0
	40	#define AD7879_REG_CTRL1 1
	41	#define AD7879_REG_CTRL2 2
	42	#define AD7879_REG_CTRL3 3
	43	#define AD7879_REG_AUX1HIGH 4
	44	#define AD7879_REG_AUX1LOW 5
	45	#define AD7879_REG_TEMP1HIGH 6
	46	#define AD7879_REG_TEMP1LOW 7
	47	#define AD7879_REG_XPLUS 8
	48	#define AD7879_REG_YPLUS 9
	49	#define AD7879_REG_Z1 10
	50	#define AD7879_REG_Z2 11
	51	#define AD7879_REG_AUXVBAT 12
	52	#define AD7879_REG_TEMP 13
	53	#define AD7879_REG_REVID 14
	54
	55	/* Control REG 1 */
	56	#define AD7879_TMR(x) ((x & 0xFF) << 0)
	57	#define AD7879_ACQ(x) ((x & 0x3) << 8)
	58	#define AD7879_MODE_NOC (0 << 10) /* Do not convert */
	59	#define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */
	60	#define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */
	61	#define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */
	62	#define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */
	63
	64	/* Control REG 2 */
	65	#define AD7879_FCD(x) ((x & 0x3) << 0)
	66	#define AD7879_RESET (1 << 4)
	67	#define AD7879_MFS(x) ((x & 0x3) << 5)
	68	#define AD7879_AVG(x) ((x & 0x3) << 7)
	69	#define AD7879_SER (1 << 9) /* non-differential */
	70	#define AD7879_DFR (0 << 9) /* differential */
	71	#define AD7879_GPIOPOL (1 << 10)
	72	#define AD7879_GPIODIR (1 << 11)
	73	#define AD7879_GPIO_DATA (1 << 12)
	74	#define AD7879_GPIO_EN (1 << 13)
	75	#define AD7879_PM(x) ((x & 0x3) << 14)
	76	#define AD7879_PM_SHUTDOWN (0)
	77	#define AD7879_PM_DYN (1)
	78	#define AD7879_PM_FULLON (2)
	79
	80	/* Control REG 3 */
	81	#define AD7879_TEMPMASK_BIT (1<<15)
	82	#define AD7879_AUXVBATMASK_BIT (1<<14)
	83	#define AD7879_INTMODE_BIT (1<<13)
	84	#define AD7879_GPIOALERTMASK_BIT (1<<12)
	85	#define AD7879_AUXLOW_BIT (1<<11)
	86	#define AD7879_AUXHIGH_BIT (1<<10)
	87	#define AD7879_TEMPLOW_BIT (1<<9)
	88	#define AD7879_TEMPHIGH_BIT (1<<8)
	89	#define AD7879_YPLUS_BIT (1<<7)
	90	#define AD7879_XPLUS_BIT (1<<6)
	91	#define AD7879_Z1_BIT (1<<5)
	92	#define AD7879_Z2_BIT (1<<4)
	93	#define AD7879_AUX_BIT (1<<3)
	94	#define AD7879_VBAT_BIT (1<<2)
	95	#define AD7879_TEMP_BIT (1<<1)
	96
	97	enum {
5f2940c4 SA	98	AD7879_SEQ_YPOS = 0,
5f2940c4 SA	99	AD7879_SEQ_XPOS = 1,
b4be468c MH	100	AD7879_SEQ_Z1 = 2,
	101	AD7879_SEQ_Z2 = 3,
	102	AD7879_NR_SENSE = 4,
	103	};
	104
	105	#define MAX_12BIT ((1<<12)-1)
	106	#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
	107
b4be468c	108	struct ad7879 {
404a24c3	109	struct regmap *regmap;
4397c98a	110	struct device *dev;
b4be468c	111	struct input_dev *input;
b4be468c	112	struct timer_list timer;
ec51b7f5 MH	113	#ifdef CONFIG_GPIOLIB
ec51b7f5 MH	114	struct gpio_chip gc;
14fbbc36	115	struct mutex mutex;
ec51b7f5	116	#endif
4397c98a	117	unsigned int irq;
14fbbc36 DT	118	bool disabled; /* P: input->mutex */
14fbbc36 DT	119	bool suspended; /* P: input->mutex */
6680884a	120	bool swap_xy;
b4be468c MH	121	u16 conversion_data[AD7879_NR_SENSE];
	122	char phys[32];
	123	u8 first_conversion_delay;
	124	u8 acquisition_time;
	125	u8 averaging;
	126	u8 pen_down_acc_interval;
	127	u8 median;
	128	u16 x_plate_ohms;
b4be468c MH	129	u16 cmd_crtl1;
	130	u16 cmd_crtl2;
	131	u16 cmd_crtl3;
b584efc9 MH	132	int x;
	133	int y;
	134	int Rt;
b4be468c MH	135	};
b4be468c MH	136
4397c98a MF	137	static int ad7879_read(struct ad7879 *ts, u8 reg)
4397c98a MF	138	{
404a24c3 DT	139	unsigned int val;
404a24c3 DT	140	int error;
4397c98a	141
404a24c3 DT	142	error = regmap_read(ts->regmap, reg, &val);
	143	if (error) {
	144	dev_err(ts->dev, "failed to read register %#02x: %d\n",
	145	reg, error);
	146	return error;
	147	}
	148
	149	return val;
4397c98a MF	150	}
	151
	152	static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
	153	{
404a24c3 DT	154	int error;
	155
	156	error = regmap_write(ts->regmap, reg, val);
	157	if (error) {
	158	dev_err(ts->dev,
	159	"failed to write %#04x to register %#02x: %d\n",
	160	val, reg, error);
	161	return error;
	162	}
	163
	164	return 0;
4397c98a	165	}
b4be468c	166
963ce8ae	167	static int ad7879_report(struct ad7879 *ts)
b4be468c MH	168	{
	169	struct input_dev *input_dev = ts->input;
	170	unsigned Rt;
	171	u16 x, y, z1, z2;
	172
	173	x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
	174	y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
	175	z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
	176	z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
	177
6680884a MH	178	if (ts->swap_xy)
	179	swap(x, y);
	180
b4be468c MH	181	/*
b4be468c MH	182	* The samples processed here are already preprocessed by the AD7879.
4397c98a MF	183	* The preprocessing function consists of a median and an averaging
	184	* filter. The combination of these two techniques provides a robust
	185	* solution, discarding the spurious noise in the signal and keeping
	186	* only the data of interest. The size of both filters is
4774f400 SA	187	* programmable. (dev.platform_data, see linux/platform_data/ad7879.h)
	188	* Other user-programmable conversion controls include variable
	189	* acquisition time, and first conversion delay. Up to 16 averages can
	190	* be taken per conversion.
b4be468c MH	191	*/
	192
	193	if (likely(x && z1)) {
	194	/* compute touch pressure resistance using equation #1 */
	195	Rt = (z2 - z1) * x * ts->x_plate_ohms;
	196	Rt /= z1;
	197	Rt = (Rt + 2047) >> 12;
	198
b584efc9 MH	199	/*
	200	* Sample found inconsistent, pressure is beyond
	201	* the maximum. Don't report it to user space.
	202	*/
fa6e3ca2	203	if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE))
b584efc9 MH	204	return -EINVAL;
	205
	206	/*
	207	* Note that we delay reporting events by one sample.
	208	* This is done to avoid reporting last sample of the
	209	* touch sequence, which may be incomplete if finger
	210	* leaves the surface before last reading is taken.
	211	*/
	212	if (timer_pending(&ts->timer)) {
	213	/* Touch continues */
963ce8ae	214	input_report_key(input_dev, BTN_TOUCH, 1);
b584efc9 MH	215	input_report_abs(input_dev, ABS_X, ts->x);
	216	input_report_abs(input_dev, ABS_Y, ts->y);
	217	input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
	218	input_sync(input_dev);
	219	}
	220
	221	ts->x = x;
	222	ts->y = y;
	223	ts->Rt = Rt;
963ce8ae	224
963ce8ae	225	return 0;
b4be468c	226	}
963ce8ae MH	227
963ce8ae MH	228	return -EINVAL;
b4be468c MH	229	}
b4be468c MH	230
b4be468c MH	231	static void ad7879_ts_event_release(struct ad7879 *ts)
	232	{
	233	struct input_dev *input_dev = ts->input;
	234
	235	input_report_abs(input_dev, ABS_PRESSURE, 0);
963ce8ae	236	input_report_key(input_dev, BTN_TOUCH, 0);
b4be468c MH	237	input_sync(input_dev);
	238	}
	239
	240	static void ad7879_timer(unsigned long handle)
	241	{
	242	struct ad7879 ts = (void )handle;
	243
	244	ad7879_ts_event_release(ts);
	245	}
	246
	247	static irqreturn_t ad7879_irq(int irq, void *handle)
	248	{
	249	struct ad7879 *ts = handle;
	250
404a24c3 DT	251	regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
404a24c3 DT	252	ts->conversion_data, AD7879_NR_SENSE);
b4be468c	253
963ce8ae MH	254	if (!ad7879_report(ts))
963ce8ae MH	255	mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
b4be468c MH	256
	257	return IRQ_HANDLED;
	258	}
	259
14fbbc36	260	static void __ad7879_enable(struct ad7879 *ts)
b4be468c	261	{
4397c98a MF	262	ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
	263	ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
	264	ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
14fbbc36 DT	265
14fbbc36 DT	266	enable_irq(ts->irq);
b4be468c MH	267	}
b4be468c MH	268
14fbbc36	269	static void __ad7879_disable(struct ad7879 *ts)
b4be468c	270	{
4fecc208 MH	271	u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) \|
4fecc208 MH	272	AD7879_PM(AD7879_PM_SHUTDOWN);
14fbbc36	273	disable_irq(ts->irq);
b4be468c	274
14fbbc36 DT	275	if (del_timer_sync(&ts->timer))
14fbbc36 DT	276	ad7879_ts_event_release(ts);
b4be468c	277
4fecc208	278	ad7879_write(ts, AD7879_REG_CTRL2, reg);
14fbbc36	279	}
b4be468c	280
b4be468c	281
14fbbc36 DT	282	static int ad7879_open(struct input_dev *input)
	283	{
	284	struct ad7879 *ts = input_get_drvdata(input);
b4be468c	285
14fbbc36 DT	286	/* protected by input->mutex */
	287	if (!ts->disabled && !ts->suspended)
	288	__ad7879_enable(ts);
	289
	290	return 0;
b4be468c MH	291	}
b4be468c MH	292
14fbbc36	293	static void ad7879_close(struct input_dev* input)
b4be468c	294	{
14fbbc36 DT	295	struct ad7879 *ts = input_get_drvdata(input);
	296
	297	/* protected by input->mutex */
	298	if (!ts->disabled && !ts->suspended)
	299	__ad7879_disable(ts);
	300	}
	301
02b6a58b	302	static int __maybe_unused ad7879_suspend(struct device *dev)
14fbbc36	303	{
8672bd93 DT	304	struct ad7879 *ts = dev_get_drvdata(dev);
8672bd93 DT	305
14fbbc36 DT	306	mutex_lock(&ts->input->mutex);
	307
	308	if (!ts->suspended && !ts->disabled && ts->input->users)
	309	__ad7879_disable(ts);
	310
	311	ts->suspended = true;
	312
	313	mutex_unlock(&ts->input->mutex);
8672bd93 DT	314
8672bd93 DT	315	return 0;
14fbbc36	316	}
14fbbc36	317
02b6a58b	318	static int __maybe_unused ad7879_resume(struct device *dev)
14fbbc36	319	{
8672bd93 DT	320	struct ad7879 *ts = dev_get_drvdata(dev);
8672bd93 DT	321
14fbbc36	322	mutex_lock(&ts->input->mutex);
b4be468c	323
14fbbc36 DT	324	if (ts->suspended && !ts->disabled && ts->input->users)
	325	__ad7879_enable(ts);
	326
	327	ts->suspended = false;
	328
	329	mutex_unlock(&ts->input->mutex);
8672bd93 DT	330
8672bd93 DT	331	return 0;
14fbbc36	332	}
8672bd93 DT	333
	334	SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume);
	335	EXPORT_SYMBOL(ad7879_pm_ops);
14fbbc36 DT	336
	337	static void ad7879_toggle(struct ad7879 *ts, bool disable)
	338	{
	339	mutex_lock(&ts->input->mutex);
	340
	341	if (!ts->suspended && ts->input->users != 0) {
	342
	343	if (disable) {
	344	if (ts->disabled)
	345	__ad7879_enable(ts);
	346	} else {
	347	if (!ts->disabled)
	348	__ad7879_disable(ts);
	349	}
b4be468c MH	350	}
b4be468c MH	351
14fbbc36 DT	352	ts->disabled = disable;
	353
	354	mutex_unlock(&ts->input->mutex);
b4be468c MH	355	}
	356
	357	static ssize_t ad7879_disable_show(struct device *dev,
	358	struct device_attribute attr, char buf)
	359	{
	360	struct ad7879 *ts = dev_get_drvdata(dev);
	361
	362	return sprintf(buf, "%u\n", ts->disabled);
	363	}
	364
	365	static ssize_t ad7879_disable_store(struct device *dev,
	366	struct device_attribute *attr,
	367	const char *buf, size_t count)
	368	{
	369	struct ad7879 *ts = dev_get_drvdata(dev);
76496e7a	370	unsigned int val;
b4be468c MH	371	int error;
b4be468c MH	372
76496e7a	373	error = kstrtouint(buf, 10, &val);
b4be468c MH	374	if (error)
	375	return error;
	376
14fbbc36	377	ad7879_toggle(ts, val);
b4be468c MH	378
	379	return count;
	380	}
	381
	382	static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
	383
ec51b7f5 MH	384	static struct attribute *ad7879_attributes[] = {
	385	&dev_attr_disable.attr,
	386	NULL
	387	};
	388
	389	static const struct attribute_group ad7879_attr_group = {
	390	.attrs = ad7879_attributes,
	391	};
	392
	393	#ifdef CONFIG_GPIOLIB
	394	static int ad7879_gpio_direction_input(struct gpio_chip *chip,
	395	unsigned gpio)
b4be468c	396	{
d9478044	397	struct ad7879 *ts = gpiochip_get_data(chip);
ec51b7f5	398	int err;
b4be468c	399
ec51b7f5 MH	400	mutex_lock(&ts->mutex);
ec51b7f5 MH	401	ts->cmd_crtl2 \|= AD7879_GPIO_EN \| AD7879_GPIODIR \| AD7879_GPIOPOL;
4397c98a	402	err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
ec51b7f5 MH	403	mutex_unlock(&ts->mutex);
	404
	405	return err;
b4be468c MH	406	}
b4be468c MH	407
ec51b7f5 MH	408	static int ad7879_gpio_direction_output(struct gpio_chip *chip,
ec51b7f5 MH	409	unsigned gpio, int level)
b4be468c	410	{
d9478044	411	struct ad7879 *ts = gpiochip_get_data(chip);
ec51b7f5	412	int err;
b4be468c	413
ec51b7f5 MH	414	mutex_lock(&ts->mutex);
	415	ts->cmd_crtl2 &= ~AD7879_GPIODIR;
	416	ts->cmd_crtl2 \|= AD7879_GPIO_EN \| AD7879_GPIOPOL;
	417	if (level)
	418	ts->cmd_crtl2 \|= AD7879_GPIO_DATA;
	419	else
	420	ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
	421
4397c98a	422	err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
ec51b7f5 MH	423	mutex_unlock(&ts->mutex);
	424
	425	return err;
	426	}
	427
	428	static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
	429	{
d9478044	430	struct ad7879 *ts = gpiochip_get_data(chip);
ec51b7f5	431	u16 val;
b4be468c MH	432
b4be468c MH	433	mutex_lock(&ts->mutex);
4397c98a	434	val = ad7879_read(ts, AD7879_REG_CTRL2);
b4be468c MH	435	mutex_unlock(&ts->mutex);
b4be468c MH	436
ec51b7f5	437	return !!(val & AD7879_GPIO_DATA);
b4be468c MH	438	}
b4be468c MH	439
ec51b7f5 MH	440	static void ad7879_gpio_set_value(struct gpio_chip *chip,
	441	unsigned gpio, int value)
	442	{
d9478044	443	struct ad7879 *ts = gpiochip_get_data(chip);
b4be468c	444
ec51b7f5 MH	445	mutex_lock(&ts->mutex);
	446	if (value)
	447	ts->cmd_crtl2 \|= AD7879_GPIO_DATA;
	448	else
	449	ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
b4be468c	450
4397c98a	451	ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
ec51b7f5 MH	452	mutex_unlock(&ts->mutex);
	453	}
	454
4397c98a MF	455	static int ad7879_gpio_add(struct ad7879 *ts,
4397c98a MF	456	const struct ad7879_platform_data *pdata)
ec51b7f5	457	{
b621e30b DT	458	bool gpio_export;
b621e30b DT	459	int gpio_base;
ec51b7f5 MH	460	int ret = 0;
ec51b7f5 MH	461
b621e30b DT	462	if (pdata) {
	463	gpio_export = pdata->gpio_export;
	464	gpio_base = pdata->gpio_base;
	465	} else {
	466	gpio_export = device_property_read_bool(ts->dev,
	467	"gpio-controller");
	468	gpio_base = -1;
	469	}
	470
14fbbc36 DT	471	mutex_init(&ts->mutex);
14fbbc36 DT	472
b621e30b	473	if (gpio_export) {
ec51b7f5 MH	474	ts->gc.direction_input = ad7879_gpio_direction_input;
	475	ts->gc.direction_output = ad7879_gpio_direction_output;
	476	ts->gc.get = ad7879_gpio_get_value;
	477	ts->gc.set = ad7879_gpio_set_value;
	478	ts->gc.can_sleep = 1;
b621e30b	479	ts->gc.base = gpio_base;
ec51b7f5 MH	480	ts->gc.ngpio = 1;
	481	ts->gc.label = "AD7879-GPIO";
	482	ts->gc.owner = THIS_MODULE;
58383c78	483	ts->gc.parent = ts->dev;
ec51b7f5	484
069b2e2c	485	ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
ec51b7f5	486	if (ret)
4397c98a	487	dev_err(ts->dev, "failed to register gpio %d\n",
ec51b7f5 MH	488	ts->gc.base);
	489	}
	490
	491	return ret;
	492	}
ec51b7f5	493	#else
069b2e2c DT	494	static int ad7879_gpio_add(struct ad7879 *ts,
069b2e2c DT	495	const struct ad7879_platform_data *pdata)
ec51b7f5 MH	496	{
	497	return 0;
	498	}
ec51b7f5	499	#endif
b4be468c	500
fa6e3ca2 SA	501	static int ad7879_parse_dt(struct device dev, struct ad7879 ts)
	502	{
	503	int err;
	504	u32 tmp;
	505
	506	err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp);
	507	if (err) {
	508	dev_err(dev, "failed to get resistance-plate-x property\n");
	509	return err;
	510	}
	511	ts->x_plate_ohms = (u16)tmp;
	512
	513	device_property_read_u8(dev, "adi,first-conversion-delay",
	514	&ts->first_conversion_delay);
	515	device_property_read_u8(dev, "adi,acquisition-time",
	516	&ts->acquisition_time);
	517	device_property_read_u8(dev, "adi,median-filter-size", &ts->median);
	518	device_property_read_u8(dev, "adi,averaging", &ts->averaging);
	519	device_property_read_u8(dev, "adi,conversion-interval",
	520	&ts->pen_down_acc_interval);
	521
	522	ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y");
	523
	524	return 0;
	525	}
	526
069b2e2c DT	527	static void ad7879_cleanup_sysfs(void *_ts)
	528	{
	529	struct ad7879 *ts = _ts;
	530
	531	sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group);
	532	}
	533
4e34025b DT	534	int ad7879_probe(struct device dev, struct regmap regmap,
4e34025b DT	535	int irq, u16 bustype, u8 devid)
b4be468c	536	{
c838cb3d	537	struct ad7879_platform_data *pdata = dev_get_platdata(dev);
4397c98a	538	struct ad7879 *ts;
b4be468c	539	struct input_dev *input_dev;
b4be468c MH	540	int err;
	541	u16 revid;
	542
404a24c3	543	if (irq <= 0) {
fa6e3ca2	544	dev_err(dev, "No IRQ specified\n");
4e34025b	545	return -EINVAL;
b4be468c MH	546	}
b4be468c MH	547
fa6e3ca2 SA	548	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
fa6e3ca2 SA	549	if (!ts)
4e34025b	550	return -ENOMEM;
fa6e3ca2 SA	551
	552	if (pdata) {
	553	/* Platform data use swapped axis (backward compatibility) */
	554	ts->swap_xy = !pdata->swap_xy;
	555
	556	ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
	557
	558	ts->first_conversion_delay = pdata->first_conversion_delay;
	559	ts->acquisition_time = pdata->acquisition_time;
	560	ts->averaging = pdata->averaging;
	561	ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
	562	ts->median = pdata->median;
fa6e3ca2	563	} else {
3a97c3d1 DT	564	err = ad7879_parse_dt(dev, ts);
	565	if (err)
	566	return err;
b4be468c MH	567	}
b4be468c MH	568
fa6e3ca2 SA	569	input_dev = devm_input_allocate_device(dev);
	570	if (!input_dev) {
	571	dev_err(dev, "Failed to allocate input device\n");
4e34025b	572	return -ENOMEM;
4397c98a	573	}
b4be468c	574
4397c98a	575	ts->dev = dev;
b4be468c	576	ts->input = input_dev;
14fbbc36	577	ts->irq = irq;
404a24c3	578	ts->regmap = regmap;
5f2940c4	579
b4be468c	580	setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
4397c98a	581	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
b4be468c MH	582
	583	input_dev->name = "AD7879 Touchscreen";
	584	input_dev->phys = ts->phys;
4397c98a	585	input_dev->dev.parent = dev;
404a24c3	586	input_dev->id.bustype = bustype;
b4be468c	587
14fbbc36 DT	588	input_dev->open = ad7879_open;
	589	input_dev->close = ad7879_close;
	590
	591	input_set_drvdata(input_dev, ts);
	592
4f959635	593	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
963ce8ae	594
fa6e3ca2 SA	595	if (pdata) {
	596	input_set_abs_params(input_dev, ABS_X,
	597	pdata->x_min ? : 0,
	598	pdata->x_max ? : MAX_12BIT,
	599	0, 0);
	600	input_set_abs_params(input_dev, ABS_Y,
	601	pdata->y_min ? : 0,
	602	pdata->y_max ? : MAX_12BIT,
	603	0, 0);
	604	input_set_abs_params(input_dev, ABS_PRESSURE,
	605	pdata->pressure_min,
	606	pdata->pressure_max ? : ~0,
	607	0, 0);
	608	} else {
	609	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
	610	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
4f959635	611	input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
ed7c9870	612	touchscreen_parse_properties(input_dev, false, NULL);
fa6e3ca2 SA	613	if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
fa6e3ca2 SA	614	dev_err(dev, "Touchscreen pressure is not specified\n");
4e34025b	615	return -EINVAL;
fa6e3ca2 SA	616	}
fa6e3ca2 SA	617	}
b4be468c	618
4397c98a	619	err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
b4be468c	620	if (err < 0) {
4397c98a	621	dev_err(dev, "Failed to write %s\n", input_dev->name);
4e34025b	622	return err;
b4be468c MH	623	}
b4be468c MH	624
4397c98a MF	625	revid = ad7879_read(ts, AD7879_REG_REVID);
	626	input_dev->id.product = (revid & 0xff);
	627	input_dev->id.version = revid >> 8;
	628	if (input_dev->id.product != devid) {
	629	dev_err(dev, "Failed to probe %s (%x vs %x)\n",
	630	input_dev->name, devid, revid);
4e34025b	631	return -ENODEV;
b4be468c MH	632	}
b4be468c MH	633
ec51b7f5 MH	634	ts->cmd_crtl3 = AD7879_YPLUS_BIT \|
	635	AD7879_XPLUS_BIT \|
	636	AD7879_Z2_BIT \|
	637	AD7879_Z1_BIT \|
	638	AD7879_TEMPMASK_BIT \|
	639	AD7879_AUXVBATMASK_BIT \|
	640	AD7879_GPIOALERTMASK_BIT;
	641
	642	ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) \| AD7879_DFR \|
	643	AD7879_AVG(ts->averaging) \|
	644	AD7879_MFS(ts->median) \|
	645	AD7879_FCD(ts->first_conversion_delay);
	646
	647	ts->cmd_crtl1 = AD7879_MODE_INT \| AD7879_MODE_SEQ1 \|
	648	AD7879_ACQ(ts->acquisition_time) \|
	649	AD7879_TMR(ts->pen_down_acc_interval);
	650
fa6e3ca2 SA	651	err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq,
	652	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	653	dev_name(dev), ts);
b4be468c	654	if (err) {
fa6e3ca2	655	dev_err(dev, "Failed to request IRQ: %d\n", err);
4e34025b	656	return err;
b4be468c MH	657	}
b4be468c MH	658
14fbbc36 DT	659	__ad7879_disable(ts);
14fbbc36 DT	660
4397c98a	661	err = sysfs_create_group(&dev->kobj, &ad7879_attr_group);
b4be468c	662	if (err)
4e34025b	663	return err;
b4be468c	664
069b2e2c DT	665	err = devm_add_action_or_reset(dev, ad7879_cleanup_sysfs, ts);
069b2e2c DT	666	if (err)
4e34025b	667	return err;
b4be468c	668
069b2e2c	669	err = ad7879_gpio_add(ts, pdata);
ec51b7f5	670	if (err)
4e34025b	671	return err;
ec51b7f5	672
069b2e2c DT	673	err = input_register_device(input_dev);
069b2e2c DT	674	if (err)
4e34025b	675	return err;
b4be468c	676
af160c54 DT	677	dev_set_drvdata(dev, ts);
af160c54 DT	678
069b2e2c	679	return 0;
b4be468c	680	}
4397c98a	681	EXPORT_SYMBOL(ad7879_probe);
b4be468c	682
2581e5d1	683	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
b4be468c MH	684	MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
b4be468c MH	685	MODULE_LICENSE("GPL");