[linux-2.6-block.git] / drivers / input / touchscreen / ad7879.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * AD7879/AD7889 based touchscreen and GPIO driver
 *
 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
 *
 * 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/driver.h>

#include <linux/input/touchscreen.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(struct timer_list *t)
{
	struct ad7879 *ts = from_timer(ts, t, timer);

	ad7879_ts_event_release(ts);
}

static irqreturn_t ad7879_irq(int irq, void *handle)
{
	struct ad7879 *ts = handle;
	int error;

	error = regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
				 ts->conversion_data, AD7879_NR_SENSE);
	if (error)
		dev_err_ratelimited(ts->dev, "failed to read %#02x: %d\n",
				    AD7879_REG_XPLUS, error);
	else 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 && input_device_enabled(ts->input))
		__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 && input_device_enabled(ts->input))
		__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 && input_device_enabled(ts->input)) {

		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,
};

const struct attribute_group *ad7879_groups[] = {
	&ad7879_attr_group,
	NULL
};
EXPORT_SYMBOL_GPL(ad7879_groups);

#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)
{
	int ret = 0;

	mutex_init(&ts->mutex);

	/* Do not create a chip unless flagged for it */
	if (!device_property_read_bool(ts->dev, "gpio-controller"))
		return 0;

	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 = -1;
	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)
{
	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;
}

int ad7879_probe(struct device *dev, struct regmap *regmap,
		 int irq, u16 bustype, u8 devid)
{
	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;

	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;

	timer_setup(&ts->timer, ad7879_timer, 0);
	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);

	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 = ad7879_gpio_add(ts);
	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
80503b23	1	// SPDX-License-Identifier: GPL-2.0-or-later
b4be468c	2	/*
4397c98a	3	* AD7879/AD7889 based touchscreen and GPIO driver
b4be468c	4	*
4397c98a	5	* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
b4be468c	6	*
b4be468c MH	7	* History:
	8	* Copyright (c) 2005 David Brownell
	9	* Copyright (c) 2006 Nokia Corporation
	10	* Various changes: Imre Deak <imre.deak@nokia.com>
	11	*
	12	* Using code from:
	13	* - corgi_ts.c
	14	* Copyright (C) 2004-2005 Richard Purdie
	15	* - omap_ts.[hc], ads7846.h, ts_osk.c
	16	* Copyright (C) 2002 MontaVista Software
	17	* Copyright (C) 2004 Texas Instruments
	18	* Copyright (C) 2005 Dirk Behme
	19	* - ad7877.c
	20	* Copyright (C) 2006-2008 Analog Devices Inc.
	21	*/
	22
	23	#include <linux/device.h>
b4be468c MH	24	#include <linux/delay.h>
	25	#include <linux/input.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/irq.h>
a4deb147	28	#include <linux/property.h>
404a24c3	29	#include <linux/regmap.h>
b4be468c	30	#include <linux/slab.h>
1be7aa9b	31	#include <linux/gpio/driver.h>
b4be468c	32
fa6e3ca2	33	#include <linux/input/touchscreen.h>
d2d8442d	34	#include <linux/module.h>
4397c98a	35	#include "ad7879.h"
b4be468c MH	36
	37	#define AD7879_REG_ZEROS 0
	38	#define AD7879_REG_CTRL1 1
	39	#define AD7879_REG_CTRL2 2
	40	#define AD7879_REG_CTRL3 3
	41	#define AD7879_REG_AUX1HIGH 4
	42	#define AD7879_REG_AUX1LOW 5
	43	#define AD7879_REG_TEMP1HIGH 6
	44	#define AD7879_REG_TEMP1LOW 7
	45	#define AD7879_REG_XPLUS 8
	46	#define AD7879_REG_YPLUS 9
	47	#define AD7879_REG_Z1 10
	48	#define AD7879_REG_Z2 11
	49	#define AD7879_REG_AUXVBAT 12
	50	#define AD7879_REG_TEMP 13
	51	#define AD7879_REG_REVID 14
	52
	53	/* Control REG 1 */
	54	#define AD7879_TMR(x) ((x & 0xFF) << 0)
	55	#define AD7879_ACQ(x) ((x & 0x3) << 8)
	56	#define AD7879_MODE_NOC (0 << 10) /* Do not convert */
	57	#define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */
	58	#define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */
	59	#define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */
	60	#define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */
	61
	62	/* Control REG 2 */
	63	#define AD7879_FCD(x) ((x & 0x3) << 0)
	64	#define AD7879_RESET (1 << 4)
	65	#define AD7879_MFS(x) ((x & 0x3) << 5)
	66	#define AD7879_AVG(x) ((x & 0x3) << 7)
	67	#define AD7879_SER (1 << 9) /* non-differential */
	68	#define AD7879_DFR (0 << 9) /* differential */
	69	#define AD7879_GPIOPOL (1 << 10)
	70	#define AD7879_GPIODIR (1 << 11)
	71	#define AD7879_GPIO_DATA (1 << 12)
	72	#define AD7879_GPIO_EN (1 << 13)
	73	#define AD7879_PM(x) ((x & 0x3) << 14)
	74	#define AD7879_PM_SHUTDOWN (0)
	75	#define AD7879_PM_DYN (1)
	76	#define AD7879_PM_FULLON (2)
	77
	78	/* Control REG 3 */
	79	#define AD7879_TEMPMASK_BIT (1<<15)
	80	#define AD7879_AUXVBATMASK_BIT (1<<14)
	81	#define AD7879_INTMODE_BIT (1<<13)
	82	#define AD7879_GPIOALERTMASK_BIT (1<<12)
	83	#define AD7879_AUXLOW_BIT (1<<11)
	84	#define AD7879_AUXHIGH_BIT (1<<10)
	85	#define AD7879_TEMPLOW_BIT (1<<9)
	86	#define AD7879_TEMPHIGH_BIT (1<<8)
	87	#define AD7879_YPLUS_BIT (1<<7)
	88	#define AD7879_XPLUS_BIT (1<<6)
	89	#define AD7879_Z1_BIT (1<<5)
	90	#define AD7879_Z2_BIT (1<<4)
	91	#define AD7879_AUX_BIT (1<<3)
	92	#define AD7879_VBAT_BIT (1<<2)
	93	#define AD7879_TEMP_BIT (1<<1)
	94
	95	enum {
5f2940c4 SA	96	AD7879_SEQ_YPOS = 0,
5f2940c4 SA	97	AD7879_SEQ_XPOS = 1,
b4be468c MH	98	AD7879_SEQ_Z1 = 2,
	99	AD7879_SEQ_Z2 = 3,
	100	AD7879_NR_SENSE = 4,
	101	};
	102
	103	#define MAX_12BIT ((1<<12)-1)
	104	#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
	105
b4be468c	106	struct ad7879 {
404a24c3	107	struct regmap *regmap;
4397c98a	108	struct device *dev;
b4be468c	109	struct input_dev *input;
b4be468c	110	struct timer_list timer;
ec51b7f5 MH	111	#ifdef CONFIG_GPIOLIB
ec51b7f5 MH	112	struct gpio_chip gc;
14fbbc36	113	struct mutex mutex;
ec51b7f5	114	#endif
4397c98a	115	unsigned int irq;
14fbbc36 DT	116	bool disabled; /* P: input->mutex */
14fbbc36 DT	117	bool suspended; /* P: input->mutex */
6680884a	118	bool swap_xy;
b4be468c MH	119	u16 conversion_data[AD7879_NR_SENSE];
	120	char phys[32];
	121	u8 first_conversion_delay;
	122	u8 acquisition_time;
	123	u8 averaging;
	124	u8 pen_down_acc_interval;
	125	u8 median;
	126	u16 x_plate_ohms;
b4be468c MH	127	u16 cmd_crtl1;
	128	u16 cmd_crtl2;
	129	u16 cmd_crtl3;
b584efc9 MH	130	int x;
	131	int y;
	132	int Rt;
b4be468c MH	133	};
b4be468c MH	134
4397c98a MF	135	static int ad7879_read(struct ad7879 *ts, u8 reg)
4397c98a MF	136	{
404a24c3 DT	137	unsigned int val;
404a24c3 DT	138	int error;
4397c98a	139
404a24c3 DT	140	error = regmap_read(ts->regmap, reg, &val);
	141	if (error) {
	142	dev_err(ts->dev, "failed to read register %#02x: %d\n",
	143	reg, error);
	144	return error;
	145	}
	146
	147	return val;
4397c98a MF	148	}
	149
	150	static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
	151	{
404a24c3 DT	152	int error;
	153
	154	error = regmap_write(ts->regmap, reg, val);
	155	if (error) {
	156	dev_err(ts->dev,
	157	"failed to write %#04x to register %#02x: %d\n",
	158	val, reg, error);
	159	return error;
	160	}
	161
	162	return 0;
4397c98a	163	}
b4be468c	164
963ce8ae	165	static int ad7879_report(struct ad7879 *ts)
b4be468c MH	166	{
	167	struct input_dev *input_dev = ts->input;
	168	unsigned Rt;
	169	u16 x, y, z1, z2;
	170
	171	x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
	172	y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
	173	z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
	174	z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
	175
6680884a MH	176	if (ts->swap_xy)
	177	swap(x, y);
	178
b4be468c MH	179	/*
b4be468c MH	180	* The samples processed here are already preprocessed by the AD7879.
4397c98a MF	181	* The preprocessing function consists of a median and an averaging
	182	* filter. The combination of these two techniques provides a robust
	183	* solution, discarding the spurious noise in the signal and keeping
	184	* only the data of interest. The size of both filters is
4774f400 SA	185	* programmable. (dev.platform_data, see linux/platform_data/ad7879.h)
	186	* Other user-programmable conversion controls include variable
	187	* acquisition time, and first conversion delay. Up to 16 averages can
	188	* be taken per conversion.
b4be468c MH	189	*/
	190
	191	if (likely(x && z1)) {
	192	/* compute touch pressure resistance using equation #1 */
	193	Rt = (z2 - z1) * x * ts->x_plate_ohms;
	194	Rt /= z1;
	195	Rt = (Rt + 2047) >> 12;
	196
b584efc9 MH	197	/*
	198	* Sample found inconsistent, pressure is beyond
	199	* the maximum. Don't report it to user space.
	200	*/
fa6e3ca2	201	if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE))
b584efc9 MH	202	return -EINVAL;
	203
	204	/*
	205	* Note that we delay reporting events by one sample.
	206	* This is done to avoid reporting last sample of the
	207	* touch sequence, which may be incomplete if finger
	208	* leaves the surface before last reading is taken.
	209	*/
	210	if (timer_pending(&ts->timer)) {
	211	/* Touch continues */
963ce8ae	212	input_report_key(input_dev, BTN_TOUCH, 1);
b584efc9 MH	213	input_report_abs(input_dev, ABS_X, ts->x);
	214	input_report_abs(input_dev, ABS_Y, ts->y);
	215	input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
	216	input_sync(input_dev);
	217	}
	218
	219	ts->x = x;
	220	ts->y = y;
	221	ts->Rt = Rt;
963ce8ae	222
963ce8ae	223	return 0;
b4be468c	224	}
963ce8ae MH	225
963ce8ae MH	226	return -EINVAL;
b4be468c MH	227	}
b4be468c MH	228
b4be468c MH	229	static void ad7879_ts_event_release(struct ad7879 *ts)
	230	{
	231	struct input_dev *input_dev = ts->input;
	232
	233	input_report_abs(input_dev, ABS_PRESSURE, 0);
963ce8ae	234	input_report_key(input_dev, BTN_TOUCH, 0);
b4be468c MH	235	input_sync(input_dev);
	236	}
	237
ee03e3f0	238	static void ad7879_timer(struct timer_list *t)
b4be468c	239	{
ee03e3f0	240	struct ad7879 *ts = from_timer(ts, t, timer);
b4be468c MH	241
	242	ad7879_ts_event_release(ts);
	243	}
	244
	245	static irqreturn_t ad7879_irq(int irq, void *handle)
	246	{
	247	struct ad7879 *ts = handle;
e85bb0be	248	int error;
b4be468c	249
e85bb0be AP	250	error = regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
	251	ts->conversion_data, AD7879_NR_SENSE);
	252	if (error)
	253	dev_err_ratelimited(ts->dev, "failed to read %#02x: %d\n",
	254	AD7879_REG_XPLUS, error);
	255	else if (!ad7879_report(ts))
963ce8ae	256	mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
b4be468c MH	257
	258	return IRQ_HANDLED;
	259	}
	260
14fbbc36	261	static void __ad7879_enable(struct ad7879 *ts)
b4be468c	262	{
4397c98a MF	263	ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
	264	ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
	265	ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
14fbbc36 DT	266
14fbbc36 DT	267	enable_irq(ts->irq);
b4be468c MH	268	}
b4be468c MH	269
14fbbc36	270	static void __ad7879_disable(struct ad7879 *ts)
b4be468c	271	{
4fecc208 MH	272	u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) \|
4fecc208 MH	273	AD7879_PM(AD7879_PM_SHUTDOWN);
14fbbc36	274	disable_irq(ts->irq);
b4be468c	275
14fbbc36 DT	276	if (del_timer_sync(&ts->timer))
14fbbc36 DT	277	ad7879_ts_event_release(ts);
b4be468c	278
4fecc208	279	ad7879_write(ts, AD7879_REG_CTRL2, reg);
14fbbc36	280	}
b4be468c	281
b4be468c	282
14fbbc36 DT	283	static int ad7879_open(struct input_dev *input)
	284	{
	285	struct ad7879 *ts = input_get_drvdata(input);
b4be468c	286
14fbbc36 DT	287	/* protected by input->mutex */
	288	if (!ts->disabled && !ts->suspended)
	289	__ad7879_enable(ts);
	290
	291	return 0;
b4be468c MH	292	}
b4be468c MH	293
249d1bb2	294	static void ad7879_close(struct input_dev *input)
b4be468c	295	{
14fbbc36 DT	296	struct ad7879 *ts = input_get_drvdata(input);
	297
	298	/* protected by input->mutex */
	299	if (!ts->disabled && !ts->suspended)
	300	__ad7879_disable(ts);
	301	}
	302
02b6a58b	303	static int __maybe_unused ad7879_suspend(struct device *dev)
14fbbc36	304	{
8672bd93 DT	305	struct ad7879 *ts = dev_get_drvdata(dev);
8672bd93 DT	306
14fbbc36 DT	307	mutex_lock(&ts->input->mutex);
14fbbc36 DT	308
d69f0a43	309	if (!ts->suspended && !ts->disabled && input_device_enabled(ts->input))
14fbbc36 DT	310	__ad7879_disable(ts);
	311
	312	ts->suspended = true;
	313
	314	mutex_unlock(&ts->input->mutex);
8672bd93 DT	315
8672bd93 DT	316	return 0;
14fbbc36	317	}
14fbbc36	318
02b6a58b	319	static int __maybe_unused ad7879_resume(struct device *dev)
14fbbc36	320	{
8672bd93 DT	321	struct ad7879 *ts = dev_get_drvdata(dev);
8672bd93 DT	322
14fbbc36	323	mutex_lock(&ts->input->mutex);
b4be468c	324
d69f0a43	325	if (ts->suspended && !ts->disabled && input_device_enabled(ts->input))
14fbbc36 DT	326	__ad7879_enable(ts);
	327
	328	ts->suspended = false;
	329
	330	mutex_unlock(&ts->input->mutex);
8672bd93 DT	331
8672bd93 DT	332	return 0;
14fbbc36	333	}
8672bd93 DT	334
	335	SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume);
	336	EXPORT_SYMBOL(ad7879_pm_ops);
14fbbc36 DT	337
	338	static void ad7879_toggle(struct ad7879 *ts, bool disable)
	339	{
	340	mutex_lock(&ts->input->mutex);
	341
d69f0a43	342	if (!ts->suspended && input_device_enabled(ts->input)) {
14fbbc36 DT	343
	344	if (disable) {
	345	if (ts->disabled)
	346	__ad7879_enable(ts);
	347	} else {
	348	if (!ts->disabled)
	349	__ad7879_disable(ts);
	350	}
b4be468c MH	351	}
b4be468c MH	352
14fbbc36 DT	353	ts->disabled = disable;
	354
	355	mutex_unlock(&ts->input->mutex);
b4be468c MH	356	}
	357
	358	static ssize_t ad7879_disable_show(struct device *dev,
	359	struct device_attribute attr, char buf)
	360	{
	361	struct ad7879 *ts = dev_get_drvdata(dev);
	362
	363	return sprintf(buf, "%u\n", ts->disabled);
	364	}
	365
	366	static ssize_t ad7879_disable_store(struct device *dev,
	367	struct device_attribute *attr,
	368	const char *buf, size_t count)
	369	{
	370	struct ad7879 *ts = dev_get_drvdata(dev);
76496e7a	371	unsigned int val;
b4be468c MH	372	int error;
b4be468c MH	373
76496e7a	374	error = kstrtouint(buf, 10, &val);
b4be468c MH	375	if (error)
	376	return error;
	377
14fbbc36	378	ad7879_toggle(ts, val);
b4be468c MH	379
	380	return count;
	381	}
	382
	383	static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
	384
ec51b7f5 MH	385	static struct attribute *ad7879_attributes[] = {
	386	&dev_attr_disable.attr,
	387	NULL
	388	};
	389
	390	static const struct attribute_group ad7879_attr_group = {
	391	.attrs = ad7879_attributes,
	392	};
	393
a32fa435 DT	394	const struct attribute_group *ad7879_groups[] = {
	395	&ad7879_attr_group,
	396	NULL
	397	};
	398	EXPORT_SYMBOL_GPL(ad7879_groups);
	399
ec51b7f5 MH	400	#ifdef CONFIG_GPIOLIB
	401	static int ad7879_gpio_direction_input(struct gpio_chip *chip,
	402	unsigned gpio)
b4be468c	403	{
d9478044	404	struct ad7879 *ts = gpiochip_get_data(chip);
ec51b7f5	405	int err;
b4be468c	406
ec51b7f5 MH	407	mutex_lock(&ts->mutex);
ec51b7f5 MH	408	ts->cmd_crtl2 \|= AD7879_GPIO_EN \| AD7879_GPIODIR \| AD7879_GPIOPOL;
4397c98a	409	err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
ec51b7f5 MH	410	mutex_unlock(&ts->mutex);
	411
	412	return err;
b4be468c MH	413	}
b4be468c MH	414
ec51b7f5 MH	415	static int ad7879_gpio_direction_output(struct gpio_chip *chip,
ec51b7f5 MH	416	unsigned gpio, int level)
b4be468c	417	{
d9478044	418	struct ad7879 *ts = gpiochip_get_data(chip);
ec51b7f5	419	int err;
b4be468c	420
ec51b7f5 MH	421	mutex_lock(&ts->mutex);
	422	ts->cmd_crtl2 &= ~AD7879_GPIODIR;
	423	ts->cmd_crtl2 \|= AD7879_GPIO_EN \| AD7879_GPIOPOL;
	424	if (level)
	425	ts->cmd_crtl2 \|= AD7879_GPIO_DATA;
	426	else
	427	ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
	428
4397c98a	429	err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
ec51b7f5 MH	430	mutex_unlock(&ts->mutex);
	431
	432	return err;
	433	}
	434
	435	static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
	436	{
d9478044	437	struct ad7879 *ts = gpiochip_get_data(chip);
ec51b7f5	438	u16 val;
b4be468c MH	439
b4be468c MH	440	mutex_lock(&ts->mutex);
4397c98a	441	val = ad7879_read(ts, AD7879_REG_CTRL2);
b4be468c MH	442	mutex_unlock(&ts->mutex);
b4be468c MH	443
ec51b7f5	444	return !!(val & AD7879_GPIO_DATA);
b4be468c MH	445	}
b4be468c MH	446
ec51b7f5 MH	447	static void ad7879_gpio_set_value(struct gpio_chip *chip,
	448	unsigned gpio, int value)
	449	{
d9478044	450	struct ad7879 *ts = gpiochip_get_data(chip);
b4be468c	451
ec51b7f5 MH	452	mutex_lock(&ts->mutex);
	453	if (value)
	454	ts->cmd_crtl2 \|= AD7879_GPIO_DATA;
	455	else
	456	ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
b4be468c	457
4397c98a	458	ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
ec51b7f5 MH	459	mutex_unlock(&ts->mutex);
	460	}
	461
1be7aa9b	462	static int ad7879_gpio_add(struct ad7879 *ts)
ec51b7f5	463	{
ec51b7f5 MH	464	int ret = 0;
ec51b7f5 MH	465
14fbbc36 DT	466	mutex_init(&ts->mutex);
14fbbc36 DT	467
1be7aa9b LW	468	/* Do not create a chip unless flagged for it */
	469	if (!device_property_read_bool(ts->dev, "gpio-controller"))
	470	return 0;
	471
	472	ts->gc.direction_input = ad7879_gpio_direction_input;
	473	ts->gc.direction_output = ad7879_gpio_direction_output;
	474	ts->gc.get = ad7879_gpio_get_value;
	475	ts->gc.set = ad7879_gpio_set_value;
	476	ts->gc.can_sleep = 1;
	477	ts->gc.base = -1;
	478	ts->gc.ngpio = 1;
	479	ts->gc.label = "AD7879-GPIO";
	480	ts->gc.owner = THIS_MODULE;
	481	ts->gc.parent = ts->dev;
	482
	483	ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
	484	if (ret)
	485	dev_err(ts->dev, "failed to register gpio %d\n",
	486	ts->gc.base);
ec51b7f5 MH	487
	488	return ret;
	489	}
ec51b7f5	490	#else
1be7aa9b	491	static int ad7879_gpio_add(struct ad7879 *ts)
ec51b7f5 MH	492	{
	493	return 0;
	494	}
ec51b7f5	495	#endif
b4be468c	496
fa6e3ca2 SA	497	static int ad7879_parse_dt(struct device dev, struct ad7879 ts)
	498	{
	499	int err;
	500	u32 tmp;
	501
	502	err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp);
	503	if (err) {
	504	dev_err(dev, "failed to get resistance-plate-x property\n");
	505	return err;
	506	}
	507	ts->x_plate_ohms = (u16)tmp;
	508
	509	device_property_read_u8(dev, "adi,first-conversion-delay",
	510	&ts->first_conversion_delay);
	511	device_property_read_u8(dev, "adi,acquisition-time",
	512	&ts->acquisition_time);
	513	device_property_read_u8(dev, "adi,median-filter-size", &ts->median);
	514	device_property_read_u8(dev, "adi,averaging", &ts->averaging);
	515	device_property_read_u8(dev, "adi,conversion-interval",
	516	&ts->pen_down_acc_interval);
	517
	518	ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y");
	519
	520	return 0;
	521	}
	522
4e34025b DT	523	int ad7879_probe(struct device dev, struct regmap regmap,
4e34025b DT	524	int irq, u16 bustype, u8 devid)
b4be468c	525	{
4397c98a	526	struct ad7879 *ts;
b4be468c	527	struct input_dev *input_dev;
b4be468c MH	528	int err;
	529	u16 revid;
	530
404a24c3	531	if (irq <= 0) {
fa6e3ca2	532	dev_err(dev, "No IRQ specified\n");
4e34025b	533	return -EINVAL;
b4be468c MH	534	}
b4be468c MH	535
fa6e3ca2 SA	536	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
fa6e3ca2 SA	537	if (!ts)
4e34025b	538	return -ENOMEM;
fa6e3ca2	539
1be7aa9b LW	540	err = ad7879_parse_dt(dev, ts);
	541	if (err)
	542	return err;
b4be468c	543
fa6e3ca2 SA	544	input_dev = devm_input_allocate_device(dev);
	545	if (!input_dev) {
	546	dev_err(dev, "Failed to allocate input device\n");
4e34025b	547	return -ENOMEM;
4397c98a	548	}
b4be468c	549
4397c98a	550	ts->dev = dev;
b4be468c	551	ts->input = input_dev;
14fbbc36	552	ts->irq = irq;
404a24c3	553	ts->regmap = regmap;
5f2940c4	554
ee03e3f0	555	timer_setup(&ts->timer, ad7879_timer, 0);
4397c98a	556	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
b4be468c MH	557
	558	input_dev->name = "AD7879 Touchscreen";
	559	input_dev->phys = ts->phys;
4397c98a	560	input_dev->dev.parent = dev;
404a24c3	561	input_dev->id.bustype = bustype;
b4be468c	562
14fbbc36 DT	563	input_dev->open = ad7879_open;
	564	input_dev->close = ad7879_close;
	565
	566	input_set_drvdata(input_dev, ts);
	567
4f959635	568	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
963ce8ae	569
1be7aa9b LW	570	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
	571	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
	572	input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
	573	touchscreen_parse_properties(input_dev, false, NULL);
	574	if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
	575	dev_err(dev, "Touchscreen pressure is not specified\n");
	576	return -EINVAL;
fa6e3ca2	577	}
b4be468c	578
4397c98a	579	err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
b4be468c	580	if (err < 0) {
4397c98a	581	dev_err(dev, "Failed to write %s\n", input_dev->name);
4e34025b	582	return err;
b4be468c MH	583	}
b4be468c MH	584
4397c98a MF	585	revid = ad7879_read(ts, AD7879_REG_REVID);
	586	input_dev->id.product = (revid & 0xff);
	587	input_dev->id.version = revid >> 8;
	588	if (input_dev->id.product != devid) {
	589	dev_err(dev, "Failed to probe %s (%x vs %x)\n",
	590	input_dev->name, devid, revid);
4e34025b	591	return -ENODEV;
b4be468c MH	592	}
b4be468c MH	593
ec51b7f5 MH	594	ts->cmd_crtl3 = AD7879_YPLUS_BIT \|
	595	AD7879_XPLUS_BIT \|
	596	AD7879_Z2_BIT \|
	597	AD7879_Z1_BIT \|
	598	AD7879_TEMPMASK_BIT \|
	599	AD7879_AUXVBATMASK_BIT \|
	600	AD7879_GPIOALERTMASK_BIT;
	601
	602	ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) \| AD7879_DFR \|
	603	AD7879_AVG(ts->averaging) \|
	604	AD7879_MFS(ts->median) \|
	605	AD7879_FCD(ts->first_conversion_delay);
	606
	607	ts->cmd_crtl1 = AD7879_MODE_INT \| AD7879_MODE_SEQ1 \|
	608	AD7879_ACQ(ts->acquisition_time) \|
	609	AD7879_TMR(ts->pen_down_acc_interval);
	610
fa6e3ca2 SA	611	err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq,
	612	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	613	dev_name(dev), ts);
b4be468c	614	if (err) {
fa6e3ca2	615	dev_err(dev, "Failed to request IRQ: %d\n", err);
4e34025b	616	return err;
b4be468c MH	617	}
b4be468c MH	618
14fbbc36 DT	619	__ad7879_disable(ts);
14fbbc36 DT	620
1be7aa9b	621	err = ad7879_gpio_add(ts);
ec51b7f5	622	if (err)
4e34025b	623	return err;
ec51b7f5	624
069b2e2c DT	625	err = input_register_device(input_dev);
069b2e2c DT	626	if (err)
4e34025b	627	return err;
b4be468c	628
af160c54 DT	629	dev_set_drvdata(dev, ts);
af160c54 DT	630
069b2e2c	631	return 0;
b4be468c	632	}
4397c98a	633	EXPORT_SYMBOL(ad7879_probe);
b4be468c	634
2581e5d1	635	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
b4be468c MH	636	MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
b4be468c MH	637	MODULE_LICENSE("GPL");