[deliverable/linux.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;
	struct gpio_desc *gpio_enable;
	struct gpio_desc *gpio_wake;
	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;

	if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) {
		if (ts->gpio_wake)
			gpiod_set_value_cansleep(ts->gpio_wake, 1);
	}

	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;
	}

	if (mode == PIXCIR_POWER_HALT) {
		if (ts->gpio_wake)
			gpiod_set_value_cansleep(ts->gpio_wake, 0);
	}

	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;

	if (ts->gpio_enable) {
		gpiod_set_value_cansleep(ts->gpio_enable, 1);
		msleep(100);
	}

	/* 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);

	if (ts->gpio_enable)
		gpiod_set_value_cansleep(ts->gpio_enable, 0);

	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;
	}

	tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
						    GPIOD_OUT_HIGH);
	if (IS_ERR(tsdata->gpio_wake)) {
		error = PTR_ERR(tsdata->gpio_wake);
		if (error != -EPROBE_DEFER)
			dev_err(dev, "Failed to get wake gpio: %d\n", error);
		return error;
	}

	tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
						      GPIOD_OUT_HIGH);
	if (IS_ERR(tsdata->gpio_enable)) {
		error = PTR_ERR(tsdata->gpio_enable);
		if (error != -EPROBE_DEFER)
			dev_err(dev, "Failed to get enable gpio: %d\n", error);
		return error;
	}

	if (tsdata->gpio_enable)
		msleep(100);

	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;
bcf5b3de SV	41	struct gpio_desc *gpio_enable;
bcf5b3de SV	42	struct gpio_desc *gpio_wake;
d48259a0	43	const struct pixcir_i2c_chip_data *chip;
36874c7e	44	int max_fingers; /* Max fingers supported in this instance */
d48259a0	45	bool running;
36a281e2 JB	46	};
36a281e2 JB	47
62e65b7e RQ	48	struct pixcir_touch {
	49	int x;
	50	int y;
36874c7e	51	int id;
62e65b7e RQ	52	};
	53
	54	struct pixcir_report_data {
	55	int num_touches;
	56	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
	57	};
	58
	59	static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
	60	struct pixcir_report_data *report)
36a281e2	61	{
36874c7e RQ	62	u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
36874c7e RQ	63	u8 wrbuf[1] = { 0 };
62e65b7e	64	u8 *bufptr;
36a281e2	65	u8 touch;
62e65b7e	66	int ret, i;
36874c7e	67	int readsize;
d48259a0	68	const struct pixcir_i2c_chip_data *chip = tsdata->chip;
62e65b7e RQ	69
62e65b7e RQ	70	memset(report, 0, sizeof(struct pixcir_report_data));
36a281e2	71
36874c7e RQ	72	i = chip->has_hw_ids ? 1 : 0;
	73	readsize = 2 + tsdata->max_fingers * (4 + i);
	74	if (readsize > sizeof(rdbuf))
	75	readsize = sizeof(rdbuf);
	76
36a281e2 JB	77	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	78	if (ret != sizeof(wrbuf)) {
	79	dev_err(&tsdata->client->dev,
	80	"%s: i2c_master_send failed(), ret=%d\n",
	81	__func__, ret);
	82	return;
	83	}
	84
36874c7e	85	ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
469d7d22	86	if (ret != readsize) {
36a281e2 JB	87	dev_err(&tsdata->client->dev,
	88	"%s: i2c_master_recv failed(), ret=%d\n",
	89	__func__, ret);
	90	return;
	91	}
	92
62e65b7e	93	touch = rdbuf[0] & 0x7;
36874c7e RQ	94	if (touch > tsdata->max_fingers)
36874c7e RQ	95	touch = tsdata->max_fingers;
62e65b7e RQ	96
	97	report->num_touches = touch;
	98	bufptr = &rdbuf[2];
	99
	100	for (i = 0; i < touch; i++) {
	101	report->touches[i].x = (bufptr[1] << 8) \| bufptr[0];
	102	report->touches[i].y = (bufptr[3] << 8) \| bufptr[2];
	103
36874c7e RQ	104	if (chip->has_hw_ids) {
	105	report->touches[i].id = bufptr[4];
	106	bufptr = bufptr + 5;
	107	} else {
	108	bufptr = bufptr + 4;
	109	}
36a281e2	110	}
62e65b7e RQ	111	}
	112
	113	static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
	114	struct pixcir_report_data *report)
	115	{
	116	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	117	int slots[PIXCIR_MAX_SLOTS];
	118	struct pixcir_touch *touch;
	119	int n, i, slot;
	120	struct device *dev = &ts->client->dev;
d48259a0	121	const struct pixcir_i2c_chip_data *chip = ts->chip;
62e65b7e RQ	122
	123	n = report->num_touches;
	124	if (n > PIXCIR_MAX_SLOTS)
	125	n = PIXCIR_MAX_SLOTS;
36a281e2	126
d48259a0	127	if (!ts->chip->has_hw_ids) {
36874c7e RQ	128	for (i = 0; i < n; i++) {
	129	touch = &report->touches[i];
	130	pos[i].x = touch->x;
	131	pos[i].y = touch->y;
	132	}
62e65b7e	133
448c7f38	134	input_mt_assign_slots(ts->input, slots, pos, n, 0);
36874c7e	135	}
62e65b7e RQ	136
	137	for (i = 0; i < n; i++) {
	138	touch = &report->touches[i];
36874c7e RQ	139
	140	if (chip->has_hw_ids) {
	141	slot = input_mt_get_slot_by_key(ts->input, touch->id);
	142	if (slot < 0) {
	143	dev_dbg(dev, "no free slot for id 0x%x\n",
	144	touch->id);
	145	continue;
	146	}
	147	} else {
	148	slot = slots[i];
	149	}
62e65b7e RQ	150
	151	input_mt_slot(ts->input, slot);
	152	input_mt_report_slot_state(ts->input,
	153	MT_TOOL_FINGER, true);
	154
	155	input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
	156	input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
	157
	158	dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
	159	i, slot, touch->x, touch->y);
	160	}
	161
	162	input_mt_sync_frame(ts->input);
	163	input_sync(ts->input);
36a281e2 JB	164	}
	165
	166	static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
	167	{
	168	struct pixcir_i2c_ts_data *tsdata = dev_id;
62e65b7e	169	struct pixcir_report_data report;
36a281e2	170
3b36fbb0	171	while (tsdata->running) {
62e65b7e RQ	172	/* parse packet */
	173	pixcir_ts_parse(tsdata, &report);
	174
	175	/* report it */
	176	pixcir_ts_report(tsdata, &report);
	177
127520ca	178	if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
62e65b7e RQ	179	if (report.num_touches) {
	180	/*
	181	* Last report with no finger up?
	182	* Do it now then.
	183	*/
	184	input_mt_sync_frame(tsdata->input);
	185	input_sync(tsdata->input);
	186	}
36a281e2	187	break;
62e65b7e	188	}
36a281e2 JB	189
	190	msleep(20);
	191	}
	192
	193	return IRQ_HANDLED;
	194	}
	195
40929167 RQ	196	static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
	197	{
	198	if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
	199	gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
	200	ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
	201	gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
	202	/* wait for controller ready. 100ms guess. */
	203	msleep(100);
	204	}
	205	}
	206
3b36fbb0 RQ	207	static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
	208	enum pixcir_power_mode mode)
	209	{
	210	struct device *dev = &ts->client->dev;
	211	int ret;
	212
bcf5b3de SV	213	if (mode == PIXCIR_POWER_ACTIVE \|\| mode == PIXCIR_POWER_IDLE) {
	214	if (ts->gpio_wake)
	215	gpiod_set_value_cansleep(ts->gpio_wake, 1);
	216	}
	217
3b36fbb0 RQ	218	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	219	if (ret < 0) {
	220	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	221	__func__, PIXCIR_REG_POWER_MODE, ret);
	222	return ret;
	223	}
	224
	225	ret &= ~PIXCIR_POWER_MODE_MASK;
	226	ret \|= mode;
	227
	228	/* Always AUTO_IDLE */
	229	ret \|= PIXCIR_POWER_ALLOW_IDLE;
	230
	231	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	232	if (ret < 0) {
	233	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	234	__func__, PIXCIR_REG_POWER_MODE, ret);
	235	return ret;
	236	}
	237
bcf5b3de SV	238	if (mode == PIXCIR_POWER_HALT) {
	239	if (ts->gpio_wake)
	240	gpiod_set_value_cansleep(ts->gpio_wake, 0);
	241	}
	242
3b36fbb0 RQ	243	return 0;
	244	}
	245
	246	/*
	247	* Set the interrupt mode for the device i.e. ATTB line behaviour
	248	*
	249	* @polarity : 1 for active high, 0 for active low.
	250	*/
	251	static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
	252	enum pixcir_int_mode mode, bool polarity)
	253	{
	254	struct device *dev = &ts->client->dev;
	255	int ret;
	256
	257	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	258	if (ret < 0) {
	259	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	260	__func__, PIXCIR_REG_INT_MODE, ret);
	261	return ret;
	262	}
	263
	264	ret &= ~PIXCIR_INT_MODE_MASK;
	265	ret \|= mode;
	266
	267	if (polarity)
	268	ret \|= PIXCIR_INT_POL_HIGH;
	269	else
	270	ret &= ~PIXCIR_INT_POL_HIGH;
	271
	272	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	273	if (ret < 0) {
	274	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	275	__func__, PIXCIR_REG_INT_MODE, ret);
	276	return ret;
	277	}
	278
	279	return 0;
	280	}
	281
	282	/*
	283	* Enable/disable interrupt generation
	284	*/
	285	static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
	286	{
	287	struct device *dev = &ts->client->dev;
	288	int ret;
	289
	290	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	291	if (ret < 0) {
	292	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	293	__func__, PIXCIR_REG_INT_MODE, ret);
	294	return ret;
	295	}
	296
	297	if (enable)
	298	ret \|= PIXCIR_INT_ENABLE;
	299	else
	300	ret &= ~PIXCIR_INT_ENABLE;
	301
	302	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	303	if (ret < 0) {
	304	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	305	__func__, PIXCIR_REG_INT_MODE, ret);
	306	return ret;
307	}
308
309	return 0;
310	}
311
312	static int pixcir_start(struct pixcir_i2c_ts_data *ts)
313	{
314	struct device *dev = &ts->client->dev;
315	int error;
316
bcf5b3de SV	317	if (ts->gpio_enable) {
	318	gpiod_set_value_cansleep(ts->gpio_enable, 1);
	319	msleep(100);
	320	}
	321
3b36fbb0 RQ	322	/* LEVEL_TOUCH interrupt with active low polarity */
	323	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
	324	if (error) {
	325	dev_err(dev, "Failed to set interrupt mode: %d\n", error);
	326	return error;
	327	}
	328
	329	ts->running = true;
	330	mb(); /* Update status before IRQ can fire */
	331
	332	/* enable interrupt generation */
	333	error = pixcir_int_enable(ts, true);
	334	if (error) {
	335	dev_err(dev, "Failed to enable interrupt generation: %d\n",
	336	error);
	337	return error;
	338	}
	339
	340	return 0;
	341	}
	342
	343	static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
	344	{
	345	int error;
	346
	347	/* Disable interrupt generation */
	348	error = pixcir_int_enable(ts, false);
	349	if (error) {
	350	dev_err(&ts->client->dev,
	351	"Failed to disable interrupt generation: %d\n",
	352	error);
	353	return error;
	354	}
	355
	356	/* Exit ISR if running, no more report parsing */
	357	ts->running = false;
	358	mb(); /* update status before we synchronize irq */
	359
	360	/* Wait till running ISR is complete */
	361	synchronize_irq(ts->client->irq);
	362
bcf5b3de SV	363	if (ts->gpio_enable)
	364	gpiod_set_value_cansleep(ts->gpio_enable, 0);
	365
3b36fbb0 RQ	366	return 0;
	367	}
	368
	369	static int pixcir_input_open(struct input_dev *dev)
	370	{
	371	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
	372
	373	return pixcir_start(ts);
	374	}
	375
	376	static void pixcir_input_close(struct input_dev *dev)
	377	{
	378	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
	379
	380	pixcir_stop(ts);
	381	}
	382
02b6a58b	383	static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
36a281e2 JB	384	{
36a281e2 JB	385	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	386	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	387	struct input_dev *input = ts->input;
	388	int ret = 0;
	389
	390	mutex_lock(&input->mutex);
	391
	392	if (device_may_wakeup(&client->dev)) {
	393	if (!input->users) {
	394	ret = pixcir_start(ts);
	395	if (ret) {
	396	dev_err(dev, "Failed to start\n");
	397	goto unlock;
	398	}
	399	}
7cdcb8d1 RQ	400	} else if (input->users) {
	401	ret = pixcir_stop(ts);
	402	}
36a281e2	403
7cdcb8d1 RQ	404	unlock:
	405	mutex_unlock(&input->mutex);
	406
	407	return ret;
36a281e2 JB	408	}
36a281e2 JB	409
02b6a58b	410	static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
36a281e2 JB	411	{
36a281e2 JB	412	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	413	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	414	struct input_dev *input = ts->input;
	415	int ret = 0;
	416
	417	mutex_lock(&input->mutex);
36a281e2	418
7cdcb8d1	419	if (device_may_wakeup(&client->dev)) {
36a281e2	420
7cdcb8d1 RQ	421	if (!input->users) {
	422	ret = pixcir_stop(ts);
	423	if (ret) {
	424	dev_err(dev, "Failed to stop\n");
	425	goto unlock;
	426	}
	427	}
	428	} else if (input->users) {
	429	ret = pixcir_start(ts);
	430	}
	431
	432	unlock:
	433	mutex_unlock(&input->mutex);
	434
	435	return ret;
36a281e2	436	}
36a281e2 JB	437
	438	static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
	439	pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
	440
a4054596 RQ	441	#ifdef CONFIG_OF
	442	static const struct of_device_id pixcir_of_match[];
	443
d48259a0 DT	444	static int pixcir_parse_dt(struct device *dev,
d48259a0 DT	445	struct pixcir_i2c_ts_data *tsdata)
a4054596	446	{
a4054596 RQ	447	const struct of_device_id *match;
	448
	449	match = of_match_device(of_match_ptr(pixcir_of_match), dev);
	450	if (!match)
d48259a0	451	return -EINVAL;
a4054596	452
d48259a0 DT	453	tsdata->chip = (const struct pixcir_i2c_chip_data *)match->data;
	454	if (!tsdata->chip)
	455	return -EINVAL;
a4054596	456
d48259a0	457	return 0;
a4054596 RQ	458	}
a4054596 RQ	459	#else
d48259a0 DT	460	static int pixcir_parse_dt(struct device *dev,
d48259a0 DT	461	struct pixcir_i2c_ts_data *tsdata)
a4054596	462	{
d48259a0	463	return -EINVAL;
a4054596 RQ	464	}
	465	#endif
	466
5298cc4c	467	static int pixcir_i2c_ts_probe(struct i2c_client *client,
d48259a0	468	const struct i2c_device_id *id)
36a281e2	469	{
c838cb3d JH	470	const struct pixcir_ts_platform_data *pdata =
c838cb3d JH	471	dev_get_platdata(&client->dev);
e9d4718d	472	struct device *dev = &client->dev;
36a281e2 JB	473	struct pixcir_i2c_ts_data *tsdata;
	474	struct input_dev *input;
	475	int error;
	476
d48259a0 DT	477	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	478	if (!tsdata)
	479	return -ENOMEM;
a4054596	480
d48259a0 DT	481	if (pdata) {
	482	tsdata->chip = &pdata->chip;
	483	} else if (dev->of_node) {
	484	error = pixcir_parse_dt(dev, tsdata);
	485	if (error)
	486	return error;
	487	} else {
36a281e2 JB	488	dev_err(&client->dev, "platform data not defined\n");
	489	return -EINVAL;
	490	}
	491
d48259a0 DT	492	if (!tsdata->chip->max_fingers) {
d48259a0 DT	493	dev_err(dev, "Invalid max_fingers in chip data\n");
36874c7e RQ	494	return -EINVAL;
	495	}
	496
e9d4718d RQ	497	input = devm_input_allocate_device(dev);
	498	if (!input) {
	499	dev_err(dev, "Failed to allocate input device\n");
	500	return -ENOMEM;
36a281e2 JB	501	}
	502
	503	tsdata->client = client;
	504	tsdata->input = input;
36a281e2 JB	505
	506	input->name = client->name;
	507	input->id.bustype = BUS_I2C;
3b36fbb0 RQ	508	input->open = pixcir_input_open;
3b36fbb0 RQ	509	input->close = pixcir_input_close;
36a281e2 JB	510	input->dev.parent = &client->dev;
36a281e2 JB	511
d48259a0 DT	512	if (pdata) {
	513	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	514	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	515	} else {
	516	input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
	517	input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
	518	touchscreen_parse_properties(input, true);
	519	if (!input_abs_get_max(input, ABS_MT_POSITION_X) \|\|
	520	!input_abs_get_max(input, ABS_MT_POSITION_Y)) {
	521	dev_err(dev, "Touchscreen size is not specified\n");
	522	return -EINVAL;
	523	}
	524	}
36a281e2	525
d48259a0	526	tsdata->max_fingers = tsdata->chip->max_fingers;
36874c7e RQ	527	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
	528	tsdata->max_fingers = PIXCIR_MAX_SLOTS;
	529	dev_info(dev, "Limiting maximum fingers to %d\n",
	530	tsdata->max_fingers);
	531	}
	532
	533	error = input_mt_init_slots(input, tsdata->max_fingers,
62e65b7e RQ	534	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
	535	if (error) {
	536	dev_err(dev, "Error initializing Multi-Touch slots\n");
	537	return error;
	538	}
	539
36a281e2 JB	540	input_set_drvdata(input, tsdata);
36a281e2 JB	541
cb4a5f06 DT	542	tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
	543	if (IS_ERR(tsdata->gpio_attb)) {
	544	error = PTR_ERR(tsdata->gpio_attb);
	545	dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
0dfc8d41 RQ	546	return error;
	547	}
	548
40929167 RQ	549	tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
	550	GPIOD_OUT_LOW);
	551	if (IS_ERR(tsdata->gpio_reset)) {
	552	error = PTR_ERR(tsdata->gpio_reset);
	553	dev_err(dev, "Failed to request RESET gpio: %d\n", error);
	554	return error;
	555	}
	556
bcf5b3de SV	557	tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
	558	GPIOD_OUT_HIGH);
	559	if (IS_ERR(tsdata->gpio_wake)) {
	560	error = PTR_ERR(tsdata->gpio_wake);
	561	if (error != -EPROBE_DEFER)
	562	dev_err(dev, "Failed to get wake gpio: %d\n", error);
	563	return error;
	564	}
	565
	566	tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
	567	GPIOD_OUT_HIGH);
	568	if (IS_ERR(tsdata->gpio_enable)) {
	569	error = PTR_ERR(tsdata->gpio_enable);
	570	if (error != -EPROBE_DEFER)
	571	dev_err(dev, "Failed to get enable gpio: %d\n", error);
	572	return error;
	573	}
	574
	575	if (tsdata->gpio_enable)
	576	msleep(100);
	577
e9d4718d RQ	578	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
	579	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	580	client->name, tsdata);
36a281e2	581	if (error) {
e9d4718d RQ	582	dev_err(dev, "failed to request irq %d\n", client->irq);
e9d4718d RQ	583	return error;
36a281e2 JB	584	}
36a281e2 JB	585
40929167 RQ	586	pixcir_reset(tsdata);
40929167 RQ	587
3b36fbb0 RQ	588	/* Always be in IDLE mode to save power, device supports auto wake */
	589	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	590	if (error) {
	591	dev_err(dev, "Failed to set IDLE mode\n");
	592	return error;
	593	}
	594
	595	/* Stop device till opened */
	596	error = pixcir_stop(tsdata);
	597	if (error)
	598	return error;
	599
36a281e2 JB	600	error = input_register_device(input);
36a281e2 JB	601	if (error)
e9d4718d	602	return error;
36a281e2	603
7cdcb8d1	604	i2c_set_clientdata(client, tsdata);
36a281e2	605
36a281e2 JB	606	return 0;
	607	}
	608
	609	static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	610	{ "pixcir_ts", 0 },
a4054596	611	{ "pixcir_tangoc", 0 },
36a281e2 JB	612	{ }
	613	};
	614	MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
	615
a4054596 RQ	616	#ifdef CONFIG_OF
	617	static const struct pixcir_i2c_chip_data pixcir_ts_data = {
	618	.max_fingers = 2,
	619	/* no hw id support */
	620	};
	621
	622	static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
	623	.max_fingers = 5,
	624	.has_hw_ids = true,
	625	};
	626
	627	static const struct of_device_id pixcir_of_match[] = {
	628	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
	629	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
	630	{ }
	631	};
	632	MODULE_DEVICE_TABLE(of, pixcir_of_match);
	633	#endif
	634
36a281e2 JB	635	static struct i2c_driver pixcir_i2c_ts_driver = {
36a281e2 JB	636	.driver = {
36a281e2 JB	637	.name = "pixcir_ts",
36a281e2 JB	638	.pm = &pixcir_dev_pm_ops,
a4054596	639	.of_match_table = of_match_ptr(pixcir_of_match),
36a281e2 JB	640	},
36a281e2 JB	641	.probe = pixcir_i2c_ts_probe,
36a281e2 JB	642	.id_table = pixcir_i2c_ts_id,
	643	};
	644
4a533835	645	module_i2c_driver(pixcir_i2c_ts_driver);
36a281e2 JB	646
	647	MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
	648	MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
	649	MODULE_LICENSE("GPL");