[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.
 */

#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_device.h>
#include <linux/platform_data/pixcir_i2c_ts.h>
#include <asm/unaligned.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;
	struct touchscreen_properties prop;
	int max_fingers;	/* Max fingers supported in this instance */
	bool running;
};

struct pixcir_report_data {
	int num_touches;
	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	int ids[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++) {
		touchscreen_set_mt_pos(&report->pos[i], &tsdata->prop,
				       get_unaligned_le16(bufptr),
				       get_unaligned_le16(bufptr + 2));
		if (chip->has_hw_ids) {
			report->ids[i] = 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)
{
	int slots[PIXCIR_MAX_SLOTS];
	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)
		input_mt_assign_slots(ts->input, slots, report->pos, n, 0);

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

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

		input_report_abs(ts->input, ABS_MT_POSITION_X,
				 report->pos[i].x);
		input_report_abs(ts->input, ABS_MT_POSITION_Y,
				 report->pos[i].y);

		dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
			i, slot, report->pos[i].x, report->pos[i].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)
{
	tsdata->chip = of_device_get_match_data(dev);
	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, &tsdata->prop);
		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.
36a281e2 JB	14	*/
	15
	16	#include <linux/delay.h>
	17	#include <linux/module.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/slab.h>
	20	#include <linux/i2c.h>
	21	#include <linux/input.h>
62e65b7e	22	#include <linux/input/mt.h>
d48259a0	23	#include <linux/input/touchscreen.h>
0dfc8d41	24	#include <linux/gpio.h>
cb4a5f06	25	#include <linux/gpio/consumer.h>
a4054596	26	#include <linux/of_device.h>
28a74c05	27	#include <linux/platform_data/pixcir_i2c_ts.h>
0bb11e96	28	#include <asm/unaligned.h>
36a281e2	29
36874c7e	30	#define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
62e65b7e	31
36a281e2 JB	32	struct pixcir_i2c_ts_data {
	33	struct i2c_client *client;
	34	struct input_dev *input;
cb4a5f06	35	struct gpio_desc *gpio_attb;
40929167	36	struct gpio_desc *gpio_reset;
bcf5b3de SV	37	struct gpio_desc *gpio_enable;
bcf5b3de SV	38	struct gpio_desc *gpio_wake;
d48259a0	39	const struct pixcir_i2c_chip_data *chip;
0bb11e96	40	struct touchscreen_properties prop;
36874c7e	41	int max_fingers; /* Max fingers supported in this instance */
d48259a0	42	bool running;
36a281e2 JB	43	};
36a281e2 JB	44
62e65b7e RQ	45	struct pixcir_report_data {
62e65b7e RQ	46	int num_touches;
0bb11e96 HG	47	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
0bb11e96 HG	48	int ids[PIXCIR_MAX_SLOTS];
62e65b7e RQ	49	};
	50
	51	static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
	52	struct pixcir_report_data *report)
36a281e2	53	{
36874c7e RQ	54	u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
36874c7e RQ	55	u8 wrbuf[1] = { 0 };
62e65b7e	56	u8 *bufptr;
36a281e2	57	u8 touch;
62e65b7e	58	int ret, i;
36874c7e	59	int readsize;
d48259a0	60	const struct pixcir_i2c_chip_data *chip = tsdata->chip;
62e65b7e RQ	61
62e65b7e RQ	62	memset(report, 0, sizeof(struct pixcir_report_data));
36a281e2	63
36874c7e RQ	64	i = chip->has_hw_ids ? 1 : 0;
	65	readsize = 2 + tsdata->max_fingers * (4 + i);
	66	if (readsize > sizeof(rdbuf))
	67	readsize = sizeof(rdbuf);
	68
36a281e2 JB	69	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	70	if (ret != sizeof(wrbuf)) {
	71	dev_err(&tsdata->client->dev,
	72	"%s: i2c_master_send failed(), ret=%d\n",
	73	__func__, ret);
	74	return;
	75	}
	76
36874c7e	77	ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
469d7d22	78	if (ret != readsize) {
36a281e2 JB	79	dev_err(&tsdata->client->dev,
	80	"%s: i2c_master_recv failed(), ret=%d\n",
	81	__func__, ret);
	82	return;
	83	}
	84
62e65b7e	85	touch = rdbuf[0] & 0x7;
36874c7e RQ	86	if (touch > tsdata->max_fingers)
36874c7e RQ	87	touch = tsdata->max_fingers;
62e65b7e RQ	88
	89	report->num_touches = touch;
	90	bufptr = &rdbuf[2];
	91
	92	for (i = 0; i < touch; i++) {
0bb11e96 HG	93	touchscreen_set_mt_pos(&report->pos[i], &tsdata->prop,
	94	get_unaligned_le16(bufptr),
	95	get_unaligned_le16(bufptr + 2));
36874c7e	96	if (chip->has_hw_ids) {
0bb11e96	97	report->ids[i] = bufptr[4];
36874c7e RQ	98	bufptr = bufptr + 5;
	99	} else {
	100	bufptr = bufptr + 4;
	101	}
36a281e2	102	}
62e65b7e RQ	103	}
	104
	105	static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
	106	struct pixcir_report_data *report)
	107	{
62e65b7e	108	int slots[PIXCIR_MAX_SLOTS];
62e65b7e RQ	109	int n, i, slot;
62e65b7e RQ	110	struct device *dev = &ts->client->dev;
d48259a0	111	const struct pixcir_i2c_chip_data *chip = ts->chip;
62e65b7e RQ	112
	113	n = report->num_touches;
	114	if (n > PIXCIR_MAX_SLOTS)
	115	n = PIXCIR_MAX_SLOTS;
36a281e2	116
0bb11e96 HG	117	if (!ts->chip->has_hw_ids)
0bb11e96 HG	118	input_mt_assign_slots(ts->input, slots, report->pos, n, 0);
62e65b7e RQ	119
62e65b7e RQ	120	for (i = 0; i < n; i++) {
36874c7e	121	if (chip->has_hw_ids) {
0bb11e96 HG	122	slot = input_mt_get_slot_by_key(ts->input,
0bb11e96 HG	123	report->ids[i]);
36874c7e RQ	124	if (slot < 0) {
36874c7e RQ	125	dev_dbg(dev, "no free slot for id 0x%x\n",
0bb11e96	126	report->ids[i]);
36874c7e RQ	127	continue;
	128	}
	129	} else {
	130	slot = slots[i];
	131	}
62e65b7e RQ	132
62e65b7e RQ	133	input_mt_slot(ts->input, slot);
0bb11e96	134	input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
62e65b7e	135
0bb11e96 HG	136	input_report_abs(ts->input, ABS_MT_POSITION_X,
	137	report->pos[i].x);
	138	input_report_abs(ts->input, ABS_MT_POSITION_Y,
	139	report->pos[i].y);
62e65b7e RQ	140
62e65b7e RQ	141	dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
0bb11e96	142	i, slot, report->pos[i].x, report->pos[i].y);
62e65b7e RQ	143	}
	144
	145	input_mt_sync_frame(ts->input);
	146	input_sync(ts->input);
36a281e2 JB	147	}
	148
	149	static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
	150	{
	151	struct pixcir_i2c_ts_data *tsdata = dev_id;
62e65b7e	152	struct pixcir_report_data report;
36a281e2	153
3b36fbb0	154	while (tsdata->running) {
62e65b7e RQ	155	/* parse packet */
	156	pixcir_ts_parse(tsdata, &report);
	157
	158	/* report it */
	159	pixcir_ts_report(tsdata, &report);
	160
127520ca	161	if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
62e65b7e RQ	162	if (report.num_touches) {
	163	/*
	164	* Last report with no finger up?
	165	* Do it now then.
	166	*/
	167	input_mt_sync_frame(tsdata->input);
	168	input_sync(tsdata->input);
	169	}
36a281e2	170	break;
62e65b7e	171	}
36a281e2 JB	172
	173	msleep(20);
	174	}
	175
	176	return IRQ_HANDLED;
	177	}
	178
40929167 RQ	179	static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
	180	{
	181	if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
	182	gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
	183	ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
	184	gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
	185	/* wait for controller ready. 100ms guess. */
	186	msleep(100);
	187	}
	188	}
	189
3b36fbb0 RQ	190	static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
	191	enum pixcir_power_mode mode)
	192	{
	193	struct device *dev = &ts->client->dev;
	194	int ret;
	195
bcf5b3de SV	196	if (mode == PIXCIR_POWER_ACTIVE \|\| mode == PIXCIR_POWER_IDLE) {
	197	if (ts->gpio_wake)
	198	gpiod_set_value_cansleep(ts->gpio_wake, 1);
	199	}
	200
3b36fbb0 RQ	201	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	202	if (ret < 0) {
	203	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	204	__func__, PIXCIR_REG_POWER_MODE, ret);
	205	return ret;
	206	}
	207
	208	ret &= ~PIXCIR_POWER_MODE_MASK;
	209	ret \|= mode;
	210
	211	/* Always AUTO_IDLE */
	212	ret \|= PIXCIR_POWER_ALLOW_IDLE;
	213
	214	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	215	if (ret < 0) {
	216	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	217	__func__, PIXCIR_REG_POWER_MODE, ret);
	218	return ret;
	219	}
	220
bcf5b3de SV	221	if (mode == PIXCIR_POWER_HALT) {
	222	if (ts->gpio_wake)
	223	gpiod_set_value_cansleep(ts->gpio_wake, 0);
	224	}
	225
3b36fbb0 RQ	226	return 0;
	227	}
	228
	229	/*
	230	* Set the interrupt mode for the device i.e. ATTB line behaviour
	231	*
	232	* @polarity : 1 for active high, 0 for active low.
	233	*/
	234	static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
	235	enum pixcir_int_mode mode, bool polarity)
	236	{
	237	struct device *dev = &ts->client->dev;
	238	int ret;
	239
	240	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	241	if (ret < 0) {
	242	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	243	__func__, PIXCIR_REG_INT_MODE, ret);
	244	return ret;
	245	}
	246
	247	ret &= ~PIXCIR_INT_MODE_MASK;
	248	ret \|= mode;
	249
	250	if (polarity)
	251	ret \|= PIXCIR_INT_POL_HIGH;
	252	else
	253	ret &= ~PIXCIR_INT_POL_HIGH;
	254
	255	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	256	if (ret < 0) {
	257	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	258	__func__, PIXCIR_REG_INT_MODE, ret);
	259	return ret;
	260	}
	261
	262	return 0;
	263	}
	264
	265	/*
	266	* Enable/disable interrupt generation
	267	*/
	268	static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
	269	{
	270	struct device *dev = &ts->client->dev;
	271	int ret;
	272
	273	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	274	if (ret < 0) {
	275	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	276	__func__, PIXCIR_REG_INT_MODE, ret);
	277	return ret;
	278	}
	279
	280	if (enable)
	281	ret \|= PIXCIR_INT_ENABLE;
	282	else
	283	ret &= ~PIXCIR_INT_ENABLE;
	284
	285	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	286	if (ret < 0) {
	287	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	288	__func__, PIXCIR_REG_INT_MODE, ret);
	289	return ret;
290	}
291
292	return 0;
293	}
294
295	static int pixcir_start(struct pixcir_i2c_ts_data *ts)
296	{
297	struct device *dev = &ts->client->dev;
298	int error;
299
bcf5b3de SV	300	if (ts->gpio_enable) {
	301	gpiod_set_value_cansleep(ts->gpio_enable, 1);
	302	msleep(100);
	303	}
	304
3b36fbb0 RQ	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
bcf5b3de SV	346	if (ts->gpio_enable)
	347	gpiod_set_value_cansleep(ts->gpio_enable, 0);
	348
3b36fbb0 RQ	349	return 0;
	350	}
	351
	352	static int pixcir_input_open(struct input_dev *dev)
	353	{
	354	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
	355
	356	return pixcir_start(ts);
	357	}
	358
	359	static void pixcir_input_close(struct input_dev *dev)
	360	{
	361	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
	362
	363	pixcir_stop(ts);
	364	}
	365
02b6a58b	366	static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
36a281e2 JB	367	{
36a281e2 JB	368	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	369	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	370	struct input_dev *input = ts->input;
	371	int ret = 0;
	372
	373	mutex_lock(&input->mutex);
	374
	375	if (device_may_wakeup(&client->dev)) {
	376	if (!input->users) {
	377	ret = pixcir_start(ts);
	378	if (ret) {
	379	dev_err(dev, "Failed to start\n");
	380	goto unlock;
	381	}
	382	}
7cdcb8d1 RQ	383	} else if (input->users) {
	384	ret = pixcir_stop(ts);
	385	}
36a281e2	386
7cdcb8d1 RQ	387	unlock:
	388	mutex_unlock(&input->mutex);
	389
	390	return ret;
36a281e2 JB	391	}
36a281e2 JB	392
02b6a58b	393	static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
36a281e2 JB	394	{
36a281e2 JB	395	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	396	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	397	struct input_dev *input = ts->input;
	398	int ret = 0;
	399
	400	mutex_lock(&input->mutex);
36a281e2	401
7cdcb8d1	402	if (device_may_wakeup(&client->dev)) {
7cdcb8d1 RQ	403	if (!input->users) {
	404	ret = pixcir_stop(ts);
	405	if (ret) {
	406	dev_err(dev, "Failed to stop\n");
	407	goto unlock;
	408	}
	409	}
	410	} else if (input->users) {
	411	ret = pixcir_start(ts);
	412	}
	413
	414	unlock:
	415	mutex_unlock(&input->mutex);
	416
	417	return ret;
36a281e2	418	}
36a281e2 JB	419
	420	static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
	421	pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
	422
a4054596 RQ	423	#ifdef CONFIG_OF
	424	static const struct of_device_id pixcir_of_match[];
	425
d48259a0 DT	426	static int pixcir_parse_dt(struct device *dev,
d48259a0 DT	427	struct pixcir_i2c_ts_data *tsdata)
a4054596	428	{
8ffef3cc	429	tsdata->chip = of_device_get_match_data(dev);
d48259a0 DT	430	if (!tsdata->chip)
d48259a0 DT	431	return -EINVAL;
a4054596	432
d48259a0	433	return 0;
a4054596 RQ	434	}
a4054596 RQ	435	#else
d48259a0 DT	436	static int pixcir_parse_dt(struct device *dev,
d48259a0 DT	437	struct pixcir_i2c_ts_data *tsdata)
a4054596	438	{
d48259a0	439	return -EINVAL;
a4054596 RQ	440	}
	441	#endif
	442
5298cc4c	443	static int pixcir_i2c_ts_probe(struct i2c_client *client,
d48259a0	444	const struct i2c_device_id *id)
36a281e2	445	{
c838cb3d JH	446	const struct pixcir_ts_platform_data *pdata =
c838cb3d JH	447	dev_get_platdata(&client->dev);
e9d4718d	448	struct device *dev = &client->dev;
36a281e2 JB	449	struct pixcir_i2c_ts_data *tsdata;
	450	struct input_dev *input;
	451	int error;
	452
d48259a0 DT	453	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	454	if (!tsdata)
	455	return -ENOMEM;
a4054596	456
d48259a0 DT	457	if (pdata) {
	458	tsdata->chip = &pdata->chip;
	459	} else if (dev->of_node) {
	460	error = pixcir_parse_dt(dev, tsdata);
	461	if (error)
	462	return error;
	463	} else {
36a281e2 JB	464	dev_err(&client->dev, "platform data not defined\n");
	465	return -EINVAL;
	466	}
	467
d48259a0 DT	468	if (!tsdata->chip->max_fingers) {
d48259a0 DT	469	dev_err(dev, "Invalid max_fingers in chip data\n");
36874c7e RQ	470	return -EINVAL;
	471	}
	472
e9d4718d RQ	473	input = devm_input_allocate_device(dev);
	474	if (!input) {
	475	dev_err(dev, "Failed to allocate input device\n");
	476	return -ENOMEM;
36a281e2 JB	477	}
	478
	479	tsdata->client = client;
	480	tsdata->input = input;
36a281e2 JB	481
	482	input->name = client->name;
	483	input->id.bustype = BUS_I2C;
3b36fbb0 RQ	484	input->open = pixcir_input_open;
3b36fbb0 RQ	485	input->close = pixcir_input_close;
36a281e2 JB	486	input->dev.parent = &client->dev;
36a281e2 JB	487
d48259a0 DT	488	if (pdata) {
	489	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	490	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	491	} else {
	492	input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
	493	input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
0bb11e96	494	touchscreen_parse_properties(input, true, &tsdata->prop);
d48259a0 DT	495	if (!input_abs_get_max(input, ABS_MT_POSITION_X) \|\|
	496	!input_abs_get_max(input, ABS_MT_POSITION_Y)) {
	497	dev_err(dev, "Touchscreen size is not specified\n");
	498	return -EINVAL;
	499	}
	500	}
36a281e2	501
d48259a0	502	tsdata->max_fingers = tsdata->chip->max_fingers;
36874c7e RQ	503	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
	504	tsdata->max_fingers = PIXCIR_MAX_SLOTS;
	505	dev_info(dev, "Limiting maximum fingers to %d\n",
	506	tsdata->max_fingers);
	507	}
	508
	509	error = input_mt_init_slots(input, tsdata->max_fingers,
62e65b7e RQ	510	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
	511	if (error) {
	512	dev_err(dev, "Error initializing Multi-Touch slots\n");
	513	return error;
	514	}
	515
36a281e2 JB	516	input_set_drvdata(input, tsdata);
36a281e2 JB	517
cb4a5f06 DT	518	tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
	519	if (IS_ERR(tsdata->gpio_attb)) {
	520	error = PTR_ERR(tsdata->gpio_attb);
	521	dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
0dfc8d41 RQ	522	return error;
	523	}
	524
40929167 RQ	525	tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
	526	GPIOD_OUT_LOW);
	527	if (IS_ERR(tsdata->gpio_reset)) {
	528	error = PTR_ERR(tsdata->gpio_reset);
	529	dev_err(dev, "Failed to request RESET gpio: %d\n", error);
	530	return error;
	531	}
	532
bcf5b3de SV	533	tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
	534	GPIOD_OUT_HIGH);
	535	if (IS_ERR(tsdata->gpio_wake)) {
	536	error = PTR_ERR(tsdata->gpio_wake);
	537	if (error != -EPROBE_DEFER)
	538	dev_err(dev, "Failed to get wake gpio: %d\n", error);
	539	return error;
	540	}
	541
	542	tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
	543	GPIOD_OUT_HIGH);
	544	if (IS_ERR(tsdata->gpio_enable)) {
	545	error = PTR_ERR(tsdata->gpio_enable);
	546	if (error != -EPROBE_DEFER)
	547	dev_err(dev, "Failed to get enable gpio: %d\n", error);
	548	return error;
	549	}
	550
	551	if (tsdata->gpio_enable)
	552	msleep(100);
	553
e9d4718d RQ	554	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
	555	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	556	client->name, tsdata);
36a281e2	557	if (error) {
e9d4718d RQ	558	dev_err(dev, "failed to request irq %d\n", client->irq);
e9d4718d RQ	559	return error;
36a281e2 JB	560	}
36a281e2 JB	561
40929167 RQ	562	pixcir_reset(tsdata);
40929167 RQ	563
3b36fbb0 RQ	564	/* Always be in IDLE mode to save power, device supports auto wake */
	565	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	566	if (error) {
	567	dev_err(dev, "Failed to set IDLE mode\n");
	568	return error;
	569	}
	570
	571	/* Stop device till opened */
	572	error = pixcir_stop(tsdata);
	573	if (error)
	574	return error;
	575
36a281e2 JB	576	error = input_register_device(input);
36a281e2 JB	577	if (error)
e9d4718d	578	return error;
36a281e2	579
7cdcb8d1	580	i2c_set_clientdata(client, tsdata);
36a281e2	581
36a281e2 JB	582	return 0;
	583	}
	584
	585	static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	586	{ "pixcir_ts", 0 },
a4054596	587	{ "pixcir_tangoc", 0 },
36a281e2 JB	588	{ }
	589	};
	590	MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
	591
a4054596 RQ	592	#ifdef CONFIG_OF
	593	static const struct pixcir_i2c_chip_data pixcir_ts_data = {
	594	.max_fingers = 2,
	595	/* no hw id support */
	596	};
	597
	598	static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
	599	.max_fingers = 5,
	600	.has_hw_ids = true,
	601	};
	602
	603	static const struct of_device_id pixcir_of_match[] = {
	604	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
	605	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
	606	{ }
	607	};
	608	MODULE_DEVICE_TABLE(of, pixcir_of_match);
	609	#endif
	610
36a281e2 JB	611	static struct i2c_driver pixcir_i2c_ts_driver = {
36a281e2 JB	612	.driver = {
36a281e2 JB	613	.name = "pixcir_ts",
36a281e2 JB	614	.pm = &pixcir_dev_pm_ops,
a4054596	615	.of_match_table = of_match_ptr(pixcir_of_match),
36a281e2 JB	616	},
36a281e2 JB	617	.probe = pixcir_i2c_ts_probe,
36a281e2 JB	618	.id_table = pixcir_i2c_ts_id,
	619	};
	620
4a533835	621	module_i2c_driver(pixcir_i2c_ts_driver);
36a281e2 JB	622
	623	MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
	624	MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
	625	MODULE_LICENSE("GPL");