[mirror_ubuntu-zesty-kernel.git] / drivers / input / touchscreen / pixcir_i2c_ts.c

/*
 * Driver for Pixcir I2C touchscreen controllers.
 *
 * Copyright (C) 2010-2011 Pixcir, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
/*#include <linux/of.h>*/
#include <linux/of_device.h>
#include <linux/platform_data/pixcir_i2c_ts.h>

#define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */

struct pixcir_i2c_ts_data {
	struct i2c_client *client;
	struct input_dev *input;
	struct gpio_desc *gpio_attb;
	struct gpio_desc *gpio_reset;
	const struct pixcir_i2c_chip_data *chip;
	int max_fingers;	/* Max fingers supported in this instance */
	bool running;
};

struct pixcir_touch {
	int x;
	int y;
	int id;
};

struct pixcir_report_data {
	int num_touches;
	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
};

static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
			    struct pixcir_report_data *report)
{
	u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
	u8 wrbuf[1] = { 0 };
	u8 *bufptr;
	u8 touch;
	int ret, i;
	int readsize;
	const struct pixcir_i2c_chip_data *chip = tsdata->chip;

	memset(report, 0, sizeof(struct pixcir_report_data));

	i = chip->has_hw_ids ? 1 : 0;
	readsize = 2 + tsdata->max_fingers * (4 + i);
	if (readsize > sizeof(rdbuf))
		readsize = sizeof(rdbuf);

	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	if (ret != sizeof(wrbuf)) {
		dev_err(&tsdata->client->dev,
			"%s: i2c_master_send failed(), ret=%d\n",
			__func__, ret);
		return;
	}

	ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
	if (ret != readsize) {
		dev_err(&tsdata->client->dev,
			"%s: i2c_master_recv failed(), ret=%d\n",
			__func__, ret);
		return;
	}

	touch = rdbuf[0] & 0x7;
	if (touch > tsdata->max_fingers)
		touch = tsdata->max_fingers;

	report->num_touches = touch;
	bufptr = &rdbuf[2];

	for (i = 0; i < touch; i++) {
		report->touches[i].x = (bufptr[1] << 8) | bufptr[0];
		report->touches[i].y = (bufptr[3] << 8) | bufptr[2];

		if (chip->has_hw_ids) {
			report->touches[i].id = bufptr[4];
			bufptr = bufptr + 5;
		} else {
			bufptr = bufptr + 4;
		}
	}
}

static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
			     struct pixcir_report_data *report)
{
	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	int slots[PIXCIR_MAX_SLOTS];
	struct pixcir_touch *touch;
	int n, i, slot;
	struct device *dev = &ts->client->dev;
	const struct pixcir_i2c_chip_data *chip = ts->chip;

	n = report->num_touches;
	if (n > PIXCIR_MAX_SLOTS)
		n = PIXCIR_MAX_SLOTS;

	if (!ts->chip->has_hw_ids) {
		for (i = 0; i < n; i++) {
			touch = &report->touches[i];
			pos[i].x = touch->x;
			pos[i].y = touch->y;
		}

		input_mt_assign_slots(ts->input, slots, pos, n, 0);
	}

	for (i = 0; i < n; i++) {
		touch = &report->touches[i];

		if (chip->has_hw_ids) {
			slot = input_mt_get_slot_by_key(ts->input, touch->id);
			if (slot < 0) {
				dev_dbg(dev, "no free slot for id 0x%x\n",
					touch->id);
				continue;
			}
		} else {
			slot = slots[i];
		}

		input_mt_slot(ts->input, slot);
		input_mt_report_slot_state(ts->input,
					   MT_TOOL_FINGER, true);

		input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
		input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);

		dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
			i, slot, touch->x, touch->y);
	}

	input_mt_sync_frame(ts->input);
	input_sync(ts->input);
}

static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
{
	struct pixcir_i2c_ts_data *tsdata = dev_id;
	struct pixcir_report_data report;

	while (tsdata->running) {
		/* parse packet */
		pixcir_ts_parse(tsdata, &report);

		/* report it */
		pixcir_ts_report(tsdata, &report);

		if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
			if (report.num_touches) {
				/*
				 * Last report with no finger up?
				 * Do it now then.
				 */
				input_mt_sync_frame(tsdata->input);
				input_sync(tsdata->input);
			}
			break;
		}

		msleep(20);
	}

	return IRQ_HANDLED;
}

static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
{
	if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
		gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
		ndelay(100);	/* datasheet section 1.2.3 says 80ns min. */
		gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
		/* wait for controller ready. 100ms guess. */
		msleep(100);
	}
}

static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
				 enum pixcir_power_mode mode)
{
	struct device *dev = &ts->client->dev;
	int ret;

	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	if (ret < 0) {
		dev_err(dev, "%s: can't read reg 0x%x : %d\n",
			__func__, PIXCIR_REG_POWER_MODE, ret);
		return ret;
	}

	ret &= ~PIXCIR_POWER_MODE_MASK;
	ret |= mode;

	/* Always AUTO_IDLE */
	ret |= PIXCIR_POWER_ALLOW_IDLE;

	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	if (ret < 0) {
		dev_err(dev, "%s: can't write reg 0x%x : %d\n",
			__func__, PIXCIR_REG_POWER_MODE, ret);
		return ret;
	}

	return 0;
}

/*
 * Set the interrupt mode for the device i.e. ATTB line behaviour
 *
 * @polarity : 1 for active high, 0 for active low.
 */
static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
			       enum pixcir_int_mode mode, bool polarity)
{
	struct device *dev = &ts->client->dev;
	int ret;

	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	if (ret < 0) {
		dev_err(dev, "%s: can't read reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	ret &= ~PIXCIR_INT_MODE_MASK;
	ret |= mode;

	if (polarity)
		ret |= PIXCIR_INT_POL_HIGH;
	else
		ret &= ~PIXCIR_INT_POL_HIGH;

	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	if (ret < 0) {
		dev_err(dev, "%s: can't write reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	return 0;
}

/*
 * Enable/disable interrupt generation
 */
static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
{
	struct device *dev = &ts->client->dev;
	int ret;

	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	if (ret < 0) {
		dev_err(dev, "%s: can't read reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	if (enable)
		ret |= PIXCIR_INT_ENABLE;
	else
		ret &= ~PIXCIR_INT_ENABLE;

	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	if (ret < 0) {
		dev_err(dev, "%s: can't write reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	return 0;
}

static int pixcir_start(struct pixcir_i2c_ts_data *ts)
{
	struct device *dev = &ts->client->dev;
	int error;

	/* LEVEL_TOUCH interrupt with active low polarity */
	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
	if (error) {
		dev_err(dev, "Failed to set interrupt mode: %d\n", error);
		return error;
	}

	ts->running = true;
	mb();	/* Update status before IRQ can fire */

	/* enable interrupt generation */
	error = pixcir_int_enable(ts, true);
	if (error) {
		dev_err(dev, "Failed to enable interrupt generation: %d\n",
			error);
		return error;
	}

	return 0;
}

static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
{
	int error;

	/* Disable interrupt generation */
	error = pixcir_int_enable(ts, false);
	if (error) {
		dev_err(&ts->client->dev,
			"Failed to disable interrupt generation: %d\n",
			error);
		return error;
	}

	/* Exit ISR if running, no more report parsing */
	ts->running = false;
	mb();	/* update status before we synchronize irq */

	/* Wait till running ISR is complete */
	synchronize_irq(ts->client->irq);

	return 0;
}

static int pixcir_input_open(struct input_dev *dev)
{
	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);

	return pixcir_start(ts);
}

static void pixcir_input_close(struct input_dev *dev)
{
	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);

	pixcir_stop(ts);
}

static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	struct input_dev *input = ts->input;
	int ret = 0;

	mutex_lock(&input->mutex);

	if (device_may_wakeup(&client->dev)) {
		if (!input->users) {
			ret = pixcir_start(ts);
			if (ret) {
				dev_err(dev, "Failed to start\n");
				goto unlock;
			}
		}
	} else if (input->users) {
		ret = pixcir_stop(ts);
	}

unlock:
	mutex_unlock(&input->mutex);

	return ret;
}

static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	struct input_dev *input = ts->input;
	int ret = 0;

	mutex_lock(&input->mutex);

	if (device_may_wakeup(&client->dev)) {

		if (!input->users) {
			ret = pixcir_stop(ts);
			if (ret) {
				dev_err(dev, "Failed to stop\n");
				goto unlock;
			}
		}
	} else if (input->users) {
		ret = pixcir_start(ts);
	}

unlock:
	mutex_unlock(&input->mutex);

	return ret;
}

static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
			 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);

#ifdef CONFIG_OF
static const struct of_device_id pixcir_of_match[];

static int pixcir_parse_dt(struct device *dev,
			   struct pixcir_i2c_ts_data *tsdata)
{
	const struct of_device_id *match;

	match = of_match_device(of_match_ptr(pixcir_of_match), dev);
	if (!match)
		return -EINVAL;

	tsdata->chip = (const struct pixcir_i2c_chip_data *)match->data;
	if (!tsdata->chip)
		return -EINVAL;

	return 0;
}
#else
static int pixcir_parse_dt(struct device *dev,
			   struct pixcir_i2c_ts_data *tsdata)
{
	return -EINVAL;
}
#endif

static int pixcir_i2c_ts_probe(struct i2c_client *client,
			       const struct i2c_device_id *id)
{
	const struct pixcir_ts_platform_data *pdata =
			dev_get_platdata(&client->dev);
	struct device *dev = &client->dev;
	struct pixcir_i2c_ts_data *tsdata;
	struct input_dev *input;
	int error;

	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	if (!tsdata)
		return -ENOMEM;

	if (pdata) {
		tsdata->chip = &pdata->chip;
	} else if (dev->of_node) {
		error = pixcir_parse_dt(dev, tsdata);
		if (error)
			return error;
	} else {
		dev_err(&client->dev, "platform data not defined\n");
		return -EINVAL;
	}

	if (!tsdata->chip->max_fingers) {
		dev_err(dev, "Invalid max_fingers in chip data\n");
		return -EINVAL;
	}

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

	tsdata->client = client;
	tsdata->input = input;

	input->name = client->name;
	input->id.bustype = BUS_I2C;
	input->open = pixcir_input_open;
	input->close = pixcir_input_close;
	input->dev.parent = &client->dev;

	if (pdata) {
		input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
		input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	} else {
		input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
		input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
		touchscreen_parse_properties(input, true);
		if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
		    !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
			dev_err(dev, "Touchscreen size is not specified\n");
			return -EINVAL;
		}
	}

	tsdata->max_fingers = tsdata->chip->max_fingers;
	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
		tsdata->max_fingers = PIXCIR_MAX_SLOTS;
		dev_info(dev, "Limiting maximum fingers to %d\n",
			 tsdata->max_fingers);
	}

	error = input_mt_init_slots(input, tsdata->max_fingers,
				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
	if (error) {
		dev_err(dev, "Error initializing Multi-Touch slots\n");
		return error;
	}

	input_set_drvdata(input, tsdata);

	tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
	if (IS_ERR(tsdata->gpio_attb)) {
		error = PTR_ERR(tsdata->gpio_attb);
		dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
		return error;
	}

	tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
						     GPIOD_OUT_LOW);
	if (IS_ERR(tsdata->gpio_reset)) {
		error = PTR_ERR(tsdata->gpio_reset);
		dev_err(dev, "Failed to request RESET gpio: %d\n", error);
		return error;
	}

	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					  client->name, tsdata);
	if (error) {
		dev_err(dev, "failed to request irq %d\n", client->irq);
		return error;
	}

	pixcir_reset(tsdata);

	/* Always be in IDLE mode to save power, device supports auto wake */
	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	if (error) {
		dev_err(dev, "Failed to set IDLE mode\n");
		return error;
	}

	/* Stop device till opened */
	error = pixcir_stop(tsdata);
	if (error)
		return error;

	error = input_register_device(input);
	if (error)
		return error;

	i2c_set_clientdata(client, tsdata);

	return 0;
}

static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	{ "pixcir_ts", 0 },
	{ "pixcir_tangoc", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);

#ifdef CONFIG_OF
static const struct pixcir_i2c_chip_data pixcir_ts_data = {
	.max_fingers = 2,
	/* no hw id support */
};

static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
	.max_fingers = 5,
	.has_hw_ids = true,
};

static const struct of_device_id pixcir_of_match[] = {
	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
	{ }
};
MODULE_DEVICE_TABLE(of, pixcir_of_match);
#endif

static struct i2c_driver pixcir_i2c_ts_driver = {
	.driver = {
		.name	= "pixcir_ts",
		.pm	= &pixcir_dev_pm_ops,
		.of_match_table = of_match_ptr(pixcir_of_match),
	},
	.probe		= pixcir_i2c_ts_probe,
	.id_table	= pixcir_i2c_ts_id,
};

module_i2c_driver(pixcir_i2c_ts_driver);

MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
36a281e2 JB	1	/*
	2	* Driver for Pixcir I2C touchscreen controllers.
	3	*
	4	* Copyright (C) 2010-2011 Pixcir, Inc.
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public
	16	* License along with this library; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include <linux/delay.h>
	21	#include <linux/module.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/slab.h>
	24	#include <linux/i2c.h>
	25	#include <linux/input.h>
62e65b7e	26	#include <linux/input/mt.h>
d48259a0	27	#include <linux/input/touchscreen.h>
0dfc8d41	28	#include <linux/gpio.h>
cb4a5f06	29	#include <linux/gpio/consumer.h>
d48259a0	30	/#include <linux/of.h>/
a4054596	31	#include <linux/of_device.h>
28a74c05	32	#include <linux/platform_data/pixcir_i2c_ts.h>
36a281e2	33
36874c7e	34	#define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
62e65b7e	35
36a281e2 JB	36	struct pixcir_i2c_ts_data {
	37	struct i2c_client *client;
	38	struct input_dev *input;
cb4a5f06	39	struct gpio_desc *gpio_attb;
40929167	40	struct gpio_desc *gpio_reset;
d48259a0	41	const struct pixcir_i2c_chip_data *chip;
36874c7e	42	int max_fingers; /* Max fingers supported in this instance */
d48259a0	43	bool running;
36a281e2 JB	44	};
36a281e2 JB	45
62e65b7e RQ	46	struct pixcir_touch {
	47	int x;
	48	int y;
36874c7e	49	int id;
62e65b7e RQ	50	};
	51
	52	struct pixcir_report_data {
	53	int num_touches;
	54	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
	55	};
	56
	57	static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
	58	struct pixcir_report_data *report)
36a281e2	59	{
36874c7e RQ	60	u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
36874c7e RQ	61	u8 wrbuf[1] = { 0 };
62e65b7e	62	u8 *bufptr;
36a281e2	63	u8 touch;
62e65b7e	64	int ret, i;
36874c7e	65	int readsize;
d48259a0	66	const struct pixcir_i2c_chip_data *chip = tsdata->chip;
62e65b7e RQ	67
62e65b7e RQ	68	memset(report, 0, sizeof(struct pixcir_report_data));
36a281e2	69
36874c7e RQ	70	i = chip->has_hw_ids ? 1 : 0;
	71	readsize = 2 + tsdata->max_fingers * (4 + i);
	72	if (readsize > sizeof(rdbuf))
	73	readsize = sizeof(rdbuf);
	74
36a281e2 JB	75	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	76	if (ret != sizeof(wrbuf)) {
	77	dev_err(&tsdata->client->dev,
	78	"%s: i2c_master_send failed(), ret=%d\n",
	79	__func__, ret);
	80	return;
	81	}
	82
36874c7e	83	ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
469d7d22	84	if (ret != readsize) {
36a281e2 JB	85	dev_err(&tsdata->client->dev,
	86	"%s: i2c_master_recv failed(), ret=%d\n",
	87	__func__, ret);
	88	return;
	89	}
	90
62e65b7e	91	touch = rdbuf[0] & 0x7;
36874c7e RQ	92	if (touch > tsdata->max_fingers)
36874c7e RQ	93	touch = tsdata->max_fingers;
62e65b7e RQ	94
	95	report->num_touches = touch;
	96	bufptr = &rdbuf[2];
	97
	98	for (i = 0; i < touch; i++) {
	99	report->touches[i].x = (bufptr[1] << 8) \| bufptr[0];
	100	report->touches[i].y = (bufptr[3] << 8) \| bufptr[2];
	101
36874c7e RQ	102	if (chip->has_hw_ids) {
	103	report->touches[i].id = bufptr[4];
	104	bufptr = bufptr + 5;
	105	} else {
	106	bufptr = bufptr + 4;
	107	}
36a281e2	108	}
62e65b7e RQ	109	}
	110
	111	static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
	112	struct pixcir_report_data *report)
	113	{
	114	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	115	int slots[PIXCIR_MAX_SLOTS];
	116	struct pixcir_touch *touch;
	117	int n, i, slot;
	118	struct device *dev = &ts->client->dev;
d48259a0	119	const struct pixcir_i2c_chip_data *chip = ts->chip;
62e65b7e RQ	120
	121	n = report->num_touches;
	122	if (n > PIXCIR_MAX_SLOTS)
	123	n = PIXCIR_MAX_SLOTS;
36a281e2	124
d48259a0	125	if (!ts->chip->has_hw_ids) {
36874c7e RQ	126	for (i = 0; i < n; i++) {
	127	touch = &report->touches[i];
	128	pos[i].x = touch->x;
	129	pos[i].y = touch->y;
	130	}
62e65b7e	131
448c7f38	132	input_mt_assign_slots(ts->input, slots, pos, n, 0);
36874c7e	133	}
62e65b7e RQ	134
	135	for (i = 0; i < n; i++) {
	136	touch = &report->touches[i];
36874c7e RQ	137
	138	if (chip->has_hw_ids) {
	139	slot = input_mt_get_slot_by_key(ts->input, touch->id);
	140	if (slot < 0) {
	141	dev_dbg(dev, "no free slot for id 0x%x\n",
	142	touch->id);
	143	continue;
	144	}
	145	} else {
	146	slot = slots[i];
	147	}
62e65b7e RQ	148
	149	input_mt_slot(ts->input, slot);
	150	input_mt_report_slot_state(ts->input,
	151	MT_TOOL_FINGER, true);
	152
	153	input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
	154	input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
	155
	156	dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
	157	i, slot, touch->x, touch->y);
	158	}
	159
	160	input_mt_sync_frame(ts->input);
	161	input_sync(ts->input);
36a281e2 JB	162	}
	163
	164	static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
	165	{
	166	struct pixcir_i2c_ts_data *tsdata = dev_id;
62e65b7e	167	struct pixcir_report_data report;
36a281e2	168
3b36fbb0	169	while (tsdata->running) {
62e65b7e RQ	170	/* parse packet */
	171	pixcir_ts_parse(tsdata, &report);
	172
	173	/* report it */
	174	pixcir_ts_report(tsdata, &report);
	175
127520ca	176	if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
62e65b7e RQ	177	if (report.num_touches) {
	178	/*
	179	* Last report with no finger up?
	180	* Do it now then.
	181	*/
	182	input_mt_sync_frame(tsdata->input);
	183	input_sync(tsdata->input);
	184	}
36a281e2	185	break;
62e65b7e	186	}
36a281e2 JB	187
	188	msleep(20);
	189	}
	190
	191	return IRQ_HANDLED;
	192	}
	193
40929167 RQ	194	static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
	195	{
	196	if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
	197	gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
	198	ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
	199	gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
	200	/* wait for controller ready. 100ms guess. */
	201	msleep(100);
	202	}
	203	}
	204
3b36fbb0 RQ	205	static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
	206	enum pixcir_power_mode mode)
	207	{
	208	struct device *dev = &ts->client->dev;
	209	int ret;
	210
	211	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	212	if (ret < 0) {
	213	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	214	__func__, PIXCIR_REG_POWER_MODE, ret);
	215	return ret;
	216	}
	217
	218	ret &= ~PIXCIR_POWER_MODE_MASK;
	219	ret \|= mode;
	220
	221	/* Always AUTO_IDLE */
	222	ret \|= PIXCIR_POWER_ALLOW_IDLE;
	223
	224	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	225	if (ret < 0) {
	226	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	227	__func__, PIXCIR_REG_POWER_MODE, ret);
	228	return ret;
	229	}
	230
	231	return 0;
	232	}
	233
	234	/*
	235	* Set the interrupt mode for the device i.e. ATTB line behaviour
	236	*
	237	* @polarity : 1 for active high, 0 for active low.
	238	*/
	239	static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
	240	enum pixcir_int_mode mode, bool polarity)
	241	{
	242	struct device *dev = &ts->client->dev;
	243	int ret;
	244
	245	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	246	if (ret < 0) {
	247	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	248	__func__, PIXCIR_REG_INT_MODE, ret);
	249	return ret;
	250	}
	251
	252	ret &= ~PIXCIR_INT_MODE_MASK;
	253	ret \|= mode;
	254
	255	if (polarity)
	256	ret \|= PIXCIR_INT_POL_HIGH;
	257	else
	258	ret &= ~PIXCIR_INT_POL_HIGH;
	259
	260	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	261	if (ret < 0) {
	262	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	263	__func__, PIXCIR_REG_INT_MODE, ret);
	264	return ret;
	265	}
	266
	267	return 0;
	268	}
269
270	/*
271	* Enable/disable interrupt generation
272	*/
273	static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
274	{
275	struct device *dev = &ts->client->dev;
276	int ret;
277
278	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
279	if (ret < 0) {
280	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
281	__func__, PIXCIR_REG_INT_MODE, ret);
282	return ret;
283	}
284
285	if (enable)
286	ret \|= PIXCIR_INT_ENABLE;
287	else
288	ret &= ~PIXCIR_INT_ENABLE;
289
290	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
291	if (ret < 0) {
292	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
293	__func__, PIXCIR_REG_INT_MODE, ret);
294	return ret;
295	}
296
297	return 0;
298	}
299
300	static int pixcir_start(struct pixcir_i2c_ts_data *ts)
301	{
302	struct device *dev = &ts->client->dev;
303	int error;
304
305	/* LEVEL_TOUCH interrupt with active low polarity */
306	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
307	if (error) {
308	dev_err(dev, "Failed to set interrupt mode: %d\n", error);
309	return error;
310	}
311
312	ts->running = true;
313	mb(); /* Update status before IRQ can fire */
314
315	/* enable interrupt generation */
316	error = pixcir_int_enable(ts, true);
317	if (error) {
318	dev_err(dev, "Failed to enable interrupt generation: %d\n",
319	error);
320	return error;
321	}
322
323	return 0;
324	}
325
326	static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
327	{
328	int error;
329
330	/* Disable interrupt generation */
331	error = pixcir_int_enable(ts, false);
332	if (error) {
333	dev_err(&ts->client->dev,
334	"Failed to disable interrupt generation: %d\n",
335	error);
336	return error;
337	}
338
339	/* Exit ISR if running, no more report parsing */
340	ts->running = false;
341	mb(); /* update status before we synchronize irq */
342
343	/* Wait till running ISR is complete */
344	synchronize_irq(ts->client->irq);
345
346	return 0;
347	}
348
349	static int pixcir_input_open(struct input_dev *dev)
350	{
351	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
352
353	return pixcir_start(ts);
354	}
355
356	static void pixcir_input_close(struct input_dev *dev)
357	{
358	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
359
360	pixcir_stop(ts);
361	}
362
02b6a58b	363	static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
36a281e2 JB	364	{
36a281e2 JB	365	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	366	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	367	struct input_dev *input = ts->input;
	368	int ret = 0;
	369
	370	mutex_lock(&input->mutex);
	371
	372	if (device_may_wakeup(&client->dev)) {
	373	if (!input->users) {
	374	ret = pixcir_start(ts);
	375	if (ret) {
	376	dev_err(dev, "Failed to start\n");
	377	goto unlock;
	378	}
	379	}
7cdcb8d1 RQ	380	} else if (input->users) {
	381	ret = pixcir_stop(ts);
	382	}
36a281e2	383
7cdcb8d1 RQ	384	unlock:
	385	mutex_unlock(&input->mutex);
	386
	387	return ret;
36a281e2 JB	388	}
36a281e2 JB	389
02b6a58b	390	static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
36a281e2 JB	391	{
36a281e2 JB	392	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	393	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	394	struct input_dev *input = ts->input;
	395	int ret = 0;
	396
	397	mutex_lock(&input->mutex);
36a281e2	398
7cdcb8d1	399	if (device_may_wakeup(&client->dev)) {
36a281e2	400
7cdcb8d1 RQ	401	if (!input->users) {
	402	ret = pixcir_stop(ts);
	403	if (ret) {
	404	dev_err(dev, "Failed to stop\n");
	405	goto unlock;
	406	}
	407	}
	408	} else if (input->users) {
	409	ret = pixcir_start(ts);
	410	}
	411
	412	unlock:
	413	mutex_unlock(&input->mutex);
	414
	415	return ret;
36a281e2	416	}
36a281e2 JB	417
	418	static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
	419	pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
	420
a4054596 RQ	421	#ifdef CONFIG_OF
	422	static const struct of_device_id pixcir_of_match[];
	423
d48259a0 DT	424	static int pixcir_parse_dt(struct device *dev,
d48259a0 DT	425	struct pixcir_i2c_ts_data *tsdata)
a4054596	426	{
a4054596 RQ	427	const struct of_device_id *match;
	428
	429	match = of_match_device(of_match_ptr(pixcir_of_match), dev);
	430	if (!match)
d48259a0	431	return -EINVAL;
a4054596	432
d48259a0 DT	433	tsdata->chip = (const struct pixcir_i2c_chip_data *)match->data;
	434	if (!tsdata->chip)
	435	return -EINVAL;
a4054596	436
d48259a0	437	return 0;
a4054596 RQ	438	}
a4054596 RQ	439	#else
d48259a0 DT	440	static int pixcir_parse_dt(struct device *dev,
d48259a0 DT	441	struct pixcir_i2c_ts_data *tsdata)
a4054596	442	{
d48259a0	443	return -EINVAL;
a4054596 RQ	444	}
	445	#endif
	446
5298cc4c	447	static int pixcir_i2c_ts_probe(struct i2c_client *client,
d48259a0	448	const struct i2c_device_id *id)
36a281e2	449	{
c838cb3d JH	450	const struct pixcir_ts_platform_data *pdata =
c838cb3d JH	451	dev_get_platdata(&client->dev);
e9d4718d	452	struct device *dev = &client->dev;
36a281e2 JB	453	struct pixcir_i2c_ts_data *tsdata;
	454	struct input_dev *input;
	455	int error;
	456
d48259a0 DT	457	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	458	if (!tsdata)
	459	return -ENOMEM;
a4054596	460
d48259a0 DT	461	if (pdata) {
	462	tsdata->chip = &pdata->chip;
	463	} else if (dev->of_node) {
	464	error = pixcir_parse_dt(dev, tsdata);
	465	if (error)
	466	return error;
	467	} else {
36a281e2 JB	468	dev_err(&client->dev, "platform data not defined\n");
	469	return -EINVAL;
	470	}
	471
d48259a0 DT	472	if (!tsdata->chip->max_fingers) {
d48259a0 DT	473	dev_err(dev, "Invalid max_fingers in chip data\n");
36874c7e RQ	474	return -EINVAL;
	475	}
	476
e9d4718d RQ	477	input = devm_input_allocate_device(dev);
	478	if (!input) {
	479	dev_err(dev, "Failed to allocate input device\n");
	480	return -ENOMEM;
36a281e2 JB	481	}
	482
	483	tsdata->client = client;
	484	tsdata->input = input;
36a281e2 JB	485
	486	input->name = client->name;
	487	input->id.bustype = BUS_I2C;
3b36fbb0 RQ	488	input->open = pixcir_input_open;
3b36fbb0 RQ	489	input->close = pixcir_input_close;
36a281e2 JB	490	input->dev.parent = &client->dev;
36a281e2 JB	491
d48259a0 DT	492	if (pdata) {
	493	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	494	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	495	} else {
	496	input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
	497	input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
	498	touchscreen_parse_properties(input, true);
	499	if (!input_abs_get_max(input, ABS_MT_POSITION_X) \|\|
	500	!input_abs_get_max(input, ABS_MT_POSITION_Y)) {
	501	dev_err(dev, "Touchscreen size is not specified\n");
	502	return -EINVAL;
	503	}
	504	}
36a281e2	505
d48259a0	506	tsdata->max_fingers = tsdata->chip->max_fingers;
36874c7e RQ	507	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
	508	tsdata->max_fingers = PIXCIR_MAX_SLOTS;
	509	dev_info(dev, "Limiting maximum fingers to %d\n",
	510	tsdata->max_fingers);
	511	}
	512
	513	error = input_mt_init_slots(input, tsdata->max_fingers,
62e65b7e RQ	514	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
	515	if (error) {
	516	dev_err(dev, "Error initializing Multi-Touch slots\n");
	517	return error;
	518	}
	519
36a281e2 JB	520	input_set_drvdata(input, tsdata);
36a281e2 JB	521
cb4a5f06 DT	522	tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
	523	if (IS_ERR(tsdata->gpio_attb)) {
	524	error = PTR_ERR(tsdata->gpio_attb);
	525	dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
0dfc8d41 RQ	526	return error;
	527	}
	528
40929167 RQ	529	tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
	530	GPIOD_OUT_LOW);
	531	if (IS_ERR(tsdata->gpio_reset)) {
	532	error = PTR_ERR(tsdata->gpio_reset);
	533	dev_err(dev, "Failed to request RESET gpio: %d\n", error);
	534	return error;
	535	}
	536
e9d4718d RQ	537	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
	538	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	539	client->name, tsdata);
36a281e2	540	if (error) {
e9d4718d RQ	541	dev_err(dev, "failed to request irq %d\n", client->irq);
e9d4718d RQ	542	return error;
36a281e2 JB	543	}
36a281e2 JB	544
40929167 RQ	545	pixcir_reset(tsdata);
40929167 RQ	546
3b36fbb0 RQ	547	/* Always be in IDLE mode to save power, device supports auto wake */
	548	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	549	if (error) {
	550	dev_err(dev, "Failed to set IDLE mode\n");
	551	return error;
	552	}
	553
	554	/* Stop device till opened */
	555	error = pixcir_stop(tsdata);
	556	if (error)
	557	return error;
	558
36a281e2 JB	559	error = input_register_device(input);
36a281e2 JB	560	if (error)
e9d4718d	561	return error;
36a281e2	562
7cdcb8d1	563	i2c_set_clientdata(client, tsdata);
36a281e2	564
36a281e2 JB	565	return 0;
	566	}
	567
	568	static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	569	{ "pixcir_ts", 0 },
a4054596	570	{ "pixcir_tangoc", 0 },
36a281e2 JB	571	{ }
	572	};
	573	MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
	574
a4054596 RQ	575	#ifdef CONFIG_OF
	576	static const struct pixcir_i2c_chip_data pixcir_ts_data = {
	577	.max_fingers = 2,
	578	/* no hw id support */
	579	};
	580
	581	static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
	582	.max_fingers = 5,
	583	.has_hw_ids = true,
	584	};
	585
	586	static const struct of_device_id pixcir_of_match[] = {
	587	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
	588	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
	589	{ }
	590	};
	591	MODULE_DEVICE_TABLE(of, pixcir_of_match);
	592	#endif
	593
36a281e2 JB	594	static struct i2c_driver pixcir_i2c_ts_driver = {
36a281e2 JB	595	.driver = {
36a281e2 JB	596	.name = "pixcir_ts",
36a281e2 JB	597	.pm = &pixcir_dev_pm_ops,
a4054596	598	.of_match_table = of_match_ptr(pixcir_of_match),
36a281e2 JB	599	},
36a281e2 JB	600	.probe = pixcir_i2c_ts_probe,
36a281e2 JB	601	.id_table = pixcir_i2c_ts_id,
	602	};
	603
4a533835	604	module_i2c_driver(pixcir_i2c_ts_driver);
36a281e2 JB	605
	606	MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
	607	MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
	608	MODULE_LICENSE("GPL");