[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/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;
	const struct pixcir_ts_platform_data *pdata;
	bool running;
	int max_fingers;	/* Max fingers supported in this instance */
};

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->pdata->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 != sizeof(rdbuf)) {
		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->pdata->chip;

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

	if (!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 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;
			}
		}

		enable_irq_wake(client->irq);
	} 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)) {
		disable_irq_wake(client->irq);

		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 struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
{
	struct pixcir_ts_platform_data *pdata;
	struct device_node *np = dev->of_node;
	const struct of_device_id *match;

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

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

	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;

	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
		dev_err(dev, "Failed to get touchscreen-size-x property\n");
		return ERR_PTR(-EINVAL);
	}
	pdata->x_max -= 1;

	if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
		dev_err(dev, "Failed to get touchscreen-size-y property\n");
		return ERR_PTR(-EINVAL);
	}
	pdata->y_max -= 1;

	dev_dbg(dev, "%s: x %d, y %d\n", __func__,
		pdata->x_max + 1, pdata->y_max + 1);

	return pdata;
}
#else
static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
{
	return ERR_PTR(-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 device_node *np = dev->of_node;
	struct pixcir_i2c_ts_data *tsdata;
	struct input_dev *input;
	int error;

	if (np && !pdata) {
		pdata = pixcir_parse_dt(dev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	}

	if (!pdata) {
		dev_err(&client->dev, "platform data not defined\n");
		return -EINVAL;
	}

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

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

	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;
	tsdata->pdata = pdata;

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

	__set_bit(EV_KEY, input->evbit);
	__set_bit(EV_ABS, input->evbit);
	__set_bit(BTN_TOUCH, input->keybit);
	input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
	input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
	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);

	tsdata->max_fingers = tsdata->pdata->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;
	}

	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;
	}

	/* 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);
	device_init_wakeup(&client->dev, 1);

	return 0;
}

static int pixcir_i2c_ts_remove(struct i2c_client *client)
{
	device_init_wakeup(&client->dev, 0);

	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 = {
		.owner	= THIS_MODULE,
		.name	= "pixcir_ts",
		.pm	= &pixcir_dev_pm_ops,
		.of_match_table = of_match_ptr(pixcir_of_match),
	},
	.probe		= pixcir_i2c_ts_probe,
	.remove		= pixcir_i2c_ts_remove,
	.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>
0dfc8d41	27	#include <linux/gpio.h>
cb4a5f06	28	#include <linux/gpio/consumer.h>
a4054596	29	#include <linux/of.h>
a4054596	30	#include <linux/of_device.h>
28a74c05	31	#include <linux/platform_data/pixcir_i2c_ts.h>
36a281e2	32
36874c7e	33	#define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
62e65b7e	34
36a281e2 JB	35	struct pixcir_i2c_ts_data {
	36	struct i2c_client *client;
	37	struct input_dev *input;
cb4a5f06	38	struct gpio_desc *gpio_attb;
36874c7e	39	const struct pixcir_ts_platform_data *pdata;
3b36fbb0	40	bool running;
36874c7e	41	int max_fingers; /* Max fingers supported in this instance */
36a281e2 JB	42	};
36a281e2 JB	43
62e65b7e RQ	44	struct pixcir_touch {
	45	int x;
	46	int y;
36874c7e	47	int id;
62e65b7e RQ	48	};
	49
	50	struct pixcir_report_data {
	51	int num_touches;
	52	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
	53	};
	54
	55	static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
	56	struct pixcir_report_data *report)
36a281e2	57	{
36874c7e RQ	58	u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
36874c7e RQ	59	u8 wrbuf[1] = { 0 };
62e65b7e	60	u8 *bufptr;
36a281e2	61	u8 touch;
62e65b7e	62	int ret, i;
36874c7e RQ	63	int readsize;
36874c7e RQ	64	const struct pixcir_i2c_chip_data *chip = &tsdata->pdata->chip;
62e65b7e RQ	65
62e65b7e RQ	66	memset(report, 0, sizeof(struct pixcir_report_data));
36a281e2	67
36874c7e RQ	68	i = chip->has_hw_ids ? 1 : 0;
	69	readsize = 2 + tsdata->max_fingers * (4 + i);
	70	if (readsize > sizeof(rdbuf))
	71	readsize = sizeof(rdbuf);
	72
36a281e2 JB	73	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	74	if (ret != sizeof(wrbuf)) {
	75	dev_err(&tsdata->client->dev,
	76	"%s: i2c_master_send failed(), ret=%d\n",
	77	__func__, ret);
	78	return;
	79	}
	80
36874c7e	81	ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
36a281e2 JB	82	if (ret != sizeof(rdbuf)) {
	83	dev_err(&tsdata->client->dev,
	84	"%s: i2c_master_recv failed(), ret=%d\n",
	85	__func__, ret);
	86	return;
	87	}
	88
62e65b7e	89	touch = rdbuf[0] & 0x7;
36874c7e RQ	90	if (touch > tsdata->max_fingers)
36874c7e RQ	91	touch = tsdata->max_fingers;
62e65b7e RQ	92
	93	report->num_touches = touch;
	94	bufptr = &rdbuf[2];
	95
	96	for (i = 0; i < touch; i++) {
	97	report->touches[i].x = (bufptr[1] << 8) \| bufptr[0];
	98	report->touches[i].y = (bufptr[3] << 8) \| bufptr[2];
	99
36874c7e RQ	100	if (chip->has_hw_ids) {
	101	report->touches[i].id = bufptr[4];
	102	bufptr = bufptr + 5;
	103	} else {
	104	bufptr = bufptr + 4;
	105	}
36a281e2	106	}
62e65b7e RQ	107	}
	108
	109	static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
	110	struct pixcir_report_data *report)
	111	{
	112	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	113	int slots[PIXCIR_MAX_SLOTS];
	114	struct pixcir_touch *touch;
	115	int n, i, slot;
	116	struct device *dev = &ts->client->dev;
36874c7e	117	const struct pixcir_i2c_chip_data *chip = &ts->pdata->chip;
62e65b7e RQ	118
	119	n = report->num_touches;
	120	if (n > PIXCIR_MAX_SLOTS)
	121	n = PIXCIR_MAX_SLOTS;
36a281e2	122
36874c7e RQ	123	if (!chip->has_hw_ids) {
	124	for (i = 0; i < n; i++) {
	125	touch = &report->touches[i];
	126	pos[i].x = touch->x;
	127	pos[i].y = touch->y;
	128	}
62e65b7e	129
448c7f38	130	input_mt_assign_slots(ts->input, slots, pos, n, 0);
36874c7e	131	}
62e65b7e RQ	132
	133	for (i = 0; i < n; i++) {
	134	touch = &report->touches[i];
36874c7e RQ	135
	136	if (chip->has_hw_ids) {
	137	slot = input_mt_get_slot_by_key(ts->input, touch->id);
	138	if (slot < 0) {
	139	dev_dbg(dev, "no free slot for id 0x%x\n",
	140	touch->id);
	141	continue;
	142	}
	143	} else {
	144	slot = slots[i];
	145	}
62e65b7e RQ	146
	147	input_mt_slot(ts->input, slot);
	148	input_mt_report_slot_state(ts->input,
	149	MT_TOOL_FINGER, true);
	150
	151	input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
	152	input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
	153
	154	dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
	155	i, slot, touch->x, touch->y);
	156	}
	157
	158	input_mt_sync_frame(ts->input);
	159	input_sync(ts->input);
36a281e2 JB	160	}
	161
	162	static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
	163	{
	164	struct pixcir_i2c_ts_data *tsdata = dev_id;
62e65b7e	165	struct pixcir_report_data report;
36a281e2	166
3b36fbb0	167	while (tsdata->running) {
62e65b7e RQ	168	/* parse packet */
	169	pixcir_ts_parse(tsdata, &report);
	170
	171	/* report it */
	172	pixcir_ts_report(tsdata, &report);
	173
127520ca	174	if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
62e65b7e RQ	175	if (report.num_touches) {
	176	/*
	177	* Last report with no finger up?
	178	* Do it now then.
	179	*/
	180	input_mt_sync_frame(tsdata->input);
	181	input_sync(tsdata->input);
	182	}
36a281e2	183	break;
62e65b7e	184	}
36a281e2 JB	185
	186	msleep(20);
	187	}
	188
	189	return IRQ_HANDLED;
	190	}
	191
3b36fbb0 RQ	192	static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
	193	enum pixcir_power_mode mode)
	194	{
	195	struct device *dev = &ts->client->dev;
	196	int ret;
	197
	198	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	199	if (ret < 0) {
	200	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	201	__func__, PIXCIR_REG_POWER_MODE, ret);
	202	return ret;
	203	}
	204
	205	ret &= ~PIXCIR_POWER_MODE_MASK;
	206	ret \|= mode;
	207
	208	/* Always AUTO_IDLE */
	209	ret \|= PIXCIR_POWER_ALLOW_IDLE;
	210
	211	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	212	if (ret < 0) {
	213	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	214	__func__, PIXCIR_REG_POWER_MODE, ret);
	215	return ret;
	216	}
	217
	218	return 0;
	219	}
	220
	221	/*
	222	* Set the interrupt mode for the device i.e. ATTB line behaviour
	223	*
	224	* @polarity : 1 for active high, 0 for active low.
	225	*/
	226	static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
	227	enum pixcir_int_mode mode, bool polarity)
	228	{
	229	struct device *dev = &ts->client->dev;
	230	int ret;
	231
	232	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	233	if (ret < 0) {
	234	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	235	__func__, PIXCIR_REG_INT_MODE, ret);
	236	return ret;
	237	}
	238
	239	ret &= ~PIXCIR_INT_MODE_MASK;
	240	ret \|= mode;
	241
	242	if (polarity)
	243	ret \|= PIXCIR_INT_POL_HIGH;
	244	else
	245	ret &= ~PIXCIR_INT_POL_HIGH;
	246
	247	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	248	if (ret < 0) {
	249	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	250	__func__, PIXCIR_REG_INT_MODE, ret);
	251	return ret;
	252	}
	253
	254	return 0;
	255	}
256
257	/*
258	* Enable/disable interrupt generation
259	*/
260	static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
261	{
262	struct device *dev = &ts->client->dev;
263	int ret;
264
265	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
266	if (ret < 0) {
267	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
268	__func__, PIXCIR_REG_INT_MODE, ret);
269	return ret;
270	}
271
272	if (enable)
273	ret \|= PIXCIR_INT_ENABLE;
274	else
275	ret &= ~PIXCIR_INT_ENABLE;
276
277	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
278	if (ret < 0) {
279	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
280	__func__, PIXCIR_REG_INT_MODE, ret);
281	return ret;
282	}
283
284	return 0;
285	}
286
287	static int pixcir_start(struct pixcir_i2c_ts_data *ts)
288	{
289	struct device *dev = &ts->client->dev;
290	int error;
291
292	/* LEVEL_TOUCH interrupt with active low polarity */
293	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
294	if (error) {
295	dev_err(dev, "Failed to set interrupt mode: %d\n", error);
296	return error;
297	}
298
299	ts->running = true;
300	mb(); /* Update status before IRQ can fire */
301
302	/* enable interrupt generation */
303	error = pixcir_int_enable(ts, true);
304	if (error) {
305	dev_err(dev, "Failed to enable interrupt generation: %d\n",
306	error);
307	return error;
308	}
309
310	return 0;
311	}
312
313	static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
314	{
315	int error;
316
317	/* Disable interrupt generation */
318	error = pixcir_int_enable(ts, false);
319	if (error) {
320	dev_err(&ts->client->dev,
321	"Failed to disable interrupt generation: %d\n",
322	error);
323	return error;
324	}
325
326	/* Exit ISR if running, no more report parsing */
327	ts->running = false;
328	mb(); /* update status before we synchronize irq */
329
330	/* Wait till running ISR is complete */
331	synchronize_irq(ts->client->irq);
332
333	return 0;
334	}
335
336	static int pixcir_input_open(struct input_dev *dev)
337	{
338	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
339
340	return pixcir_start(ts);
341	}
342
343	static void pixcir_input_close(struct input_dev *dev)
344	{
345	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
346
347	pixcir_stop(ts);
348	}
349
02b6a58b	350	static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
36a281e2 JB	351	{
36a281e2 JB	352	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	353	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	354	struct input_dev *input = ts->input;
	355	int ret = 0;
	356
	357	mutex_lock(&input->mutex);
	358
	359	if (device_may_wakeup(&client->dev)) {
	360	if (!input->users) {
	361	ret = pixcir_start(ts);
	362	if (ret) {
	363	dev_err(dev, "Failed to start\n");
	364	goto unlock;
	365	}
	366	}
36a281e2	367
36a281e2	368	enable_irq_wake(client->irq);
7cdcb8d1 RQ	369	} else if (input->users) {
	370	ret = pixcir_stop(ts);
	371	}
36a281e2	372
7cdcb8d1 RQ	373	unlock:
	374	mutex_unlock(&input->mutex);
	375
	376	return ret;
36a281e2 JB	377	}
36a281e2 JB	378
02b6a58b	379	static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
36a281e2 JB	380	{
36a281e2 JB	381	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	382	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	383	struct input_dev *input = ts->input;
	384	int ret = 0;
	385
	386	mutex_lock(&input->mutex);
36a281e2	387
7cdcb8d1	388	if (device_may_wakeup(&client->dev)) {
36a281e2 JB	389	disable_irq_wake(client->irq);
36a281e2 JB	390
7cdcb8d1 RQ	391	if (!input->users) {
	392	ret = pixcir_stop(ts);
	393	if (ret) {
	394	dev_err(dev, "Failed to stop\n");
	395	goto unlock;
	396	}
	397	}
	398	} else if (input->users) {
	399	ret = pixcir_start(ts);
	400	}
	401
	402	unlock:
	403	mutex_unlock(&input->mutex);
	404
	405	return ret;
36a281e2	406	}
36a281e2 JB	407
	408	static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
	409	pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
	410
a4054596 RQ	411	#ifdef CONFIG_OF
	412	static const struct of_device_id pixcir_of_match[];
	413
	414	static struct pixcir_ts_platform_data pixcir_parse_dt(struct device dev)
	415	{
	416	struct pixcir_ts_platform_data *pdata;
	417	struct device_node *np = dev->of_node;
	418	const struct of_device_id *match;
	419
	420	match = of_match_device(of_match_ptr(pixcir_of_match), dev);
	421	if (!match)
	422	return ERR_PTR(-EINVAL);
	423
	424	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	425	if (!pdata)
	426	return ERR_PTR(-ENOMEM);
	427
	428	pdata->chip = (const struct pixcir_i2c_chip_data )match->data;
	429
a4054596 RQ	430	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
	431	dev_err(dev, "Failed to get touchscreen-size-x property\n");
	432	return ERR_PTR(-EINVAL);
	433	}
	434	pdata->x_max -= 1;
	435
	436	if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
	437	dev_err(dev, "Failed to get touchscreen-size-y property\n");
	438	return ERR_PTR(-EINVAL);
	439	}
	440	pdata->y_max -= 1;
	441
cb4a5f06 DT	442	dev_dbg(dev, "%s: x %d, y %d\n", __func__,
cb4a5f06 DT	443	pdata->x_max + 1, pdata->y_max + 1);
a4054596 RQ	444
	445	return pdata;
	446	}
	447	#else
	448	static struct pixcir_ts_platform_data pixcir_parse_dt(struct device dev)
	449	{
	450	return ERR_PTR(-EINVAL);
	451	}
	452	#endif
	453
5298cc4c	454	static int pixcir_i2c_ts_probe(struct i2c_client *client,
36a281e2 JB	455	const struct i2c_device_id *id)
36a281e2 JB	456	{
c838cb3d JH	457	const struct pixcir_ts_platform_data *pdata =
c838cb3d JH	458	dev_get_platdata(&client->dev);
e9d4718d	459	struct device *dev = &client->dev;
a4054596	460	struct device_node *np = dev->of_node;
36a281e2 JB	461	struct pixcir_i2c_ts_data *tsdata;
	462	struct input_dev *input;
	463	int error;
	464
a4054596 RQ	465	if (np && !pdata) {
	466	pdata = pixcir_parse_dt(dev);
	467	if (IS_ERR(pdata))
	468	return PTR_ERR(pdata);
	469	}
	470
36a281e2 JB	471	if (!pdata) {
	472	dev_err(&client->dev, "platform data not defined\n");
	473	return -EINVAL;
	474	}
	475
36874c7e RQ	476	if (!pdata->chip.max_fingers) {
	477	dev_err(dev, "Invalid max_fingers in pdata\n");
	478	return -EINVAL;
	479	}
	480
e9d4718d RQ	481	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	482	if (!tsdata)
	483	return -ENOMEM;
	484
	485	input = devm_input_allocate_device(dev);
	486	if (!input) {
	487	dev_err(dev, "Failed to allocate input device\n");
	488	return -ENOMEM;
36a281e2 JB	489	}
	490
	491	tsdata->client = client;
	492	tsdata->input = input;
36874c7e	493	tsdata->pdata = pdata;
36a281e2 JB	494
	495	input->name = client->name;
	496	input->id.bustype = BUS_I2C;
3b36fbb0 RQ	497	input->open = pixcir_input_open;
3b36fbb0 RQ	498	input->close = pixcir_input_close;
36a281e2 JB	499	input->dev.parent = &client->dev;
	500
	501	__set_bit(EV_KEY, input->evbit);
	502	__set_bit(EV_ABS, input->evbit);
	503	__set_bit(BTN_TOUCH, input->keybit);
	504	input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
	505	input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
	506	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	507	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	508
36874c7e RQ	509	tsdata->max_fingers = tsdata->pdata->chip.max_fingers;
	510	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
	511	tsdata->max_fingers = PIXCIR_MAX_SLOTS;
	512	dev_info(dev, "Limiting maximum fingers to %d\n",
	513	tsdata->max_fingers);
	514	}
	515
	516	error = input_mt_init_slots(input, tsdata->max_fingers,
62e65b7e RQ	517	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
	518	if (error) {
	519	dev_err(dev, "Error initializing Multi-Touch slots\n");
	520	return error;
	521	}
	522
36a281e2 JB	523	input_set_drvdata(input, tsdata);
36a281e2 JB	524
cb4a5f06 DT	525	tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
	526	if (IS_ERR(tsdata->gpio_attb)) {
	527	error = PTR_ERR(tsdata->gpio_attb);
	528	dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
0dfc8d41 RQ	529	return error;
	530	}
	531
e9d4718d RQ	532	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
	533	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	534	client->name, tsdata);
36a281e2	535	if (error) {
e9d4718d RQ	536	dev_err(dev, "failed to request irq %d\n", client->irq);
e9d4718d RQ	537	return error;
36a281e2 JB	538	}
36a281e2 JB	539
3b36fbb0 RQ	540	/* Always be in IDLE mode to save power, device supports auto wake */
	541	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	542	if (error) {
	543	dev_err(dev, "Failed to set IDLE mode\n");
	544	return error;
	545	}
	546
	547	/* Stop device till opened */
	548	error = pixcir_stop(tsdata);
	549	if (error)
	550	return error;
	551
36a281e2 JB	552	error = input_register_device(input);
36a281e2 JB	553	if (error)
e9d4718d	554	return error;
36a281e2	555
7cdcb8d1	556	i2c_set_clientdata(client, tsdata);
36a281e2 JB	557	device_init_wakeup(&client->dev, 1);
	558
	559	return 0;
36a281e2 JB	560	}
36a281e2 JB	561
e2619cf7	562	static int pixcir_i2c_ts_remove(struct i2c_client *client)
36a281e2	563	{
36a281e2 JB	564	device_init_wakeup(&client->dev, 0);
36a281e2 JB	565
36a281e2 JB	566	return 0;
	567	}
	568
	569	static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	570	{ "pixcir_ts", 0 },
a4054596	571	{ "pixcir_tangoc", 0 },
36a281e2 JB	572	{ }
	573	};
	574	MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
	575
a4054596 RQ	576	#ifdef CONFIG_OF
	577	static const struct pixcir_i2c_chip_data pixcir_ts_data = {
	578	.max_fingers = 2,
	579	/* no hw id support */
	580	};
	581
	582	static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
	583	.max_fingers = 5,
	584	.has_hw_ids = true,
	585	};
	586
	587	static const struct of_device_id pixcir_of_match[] = {
	588	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
	589	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
	590	{ }
	591	};
	592	MODULE_DEVICE_TABLE(of, pixcir_of_match);
	593	#endif
	594
36a281e2 JB	595	static struct i2c_driver pixcir_i2c_ts_driver = {
	596	.driver = {
	597	.owner = THIS_MODULE,
	598	.name = "pixcir_ts",
	599	.pm = &pixcir_dev_pm_ops,
a4054596	600	.of_match_table = of_match_ptr(pixcir_of_match),
36a281e2 JB	601	},
36a281e2 JB	602	.probe = pixcir_i2c_ts_probe,
1cb0aa88	603	.remove = pixcir_i2c_ts_remove,
36a281e2 JB	604	.id_table = pixcir_i2c_ts_id,
	605	};
	606
4a533835	607	module_i2c_driver(pixcir_i2c_ts_driver);
36a281e2 JB	608
	609	MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
	610	MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
	611	MODULE_LICENSE("GPL");