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

// SPDX-License-Identifier: GPL-2.0+
/*
 * Touch Screen driver for Renesas MIGO-R Platform
 *
 * Copyright (c) 2008 Magnus Damm
 * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
 *  Kenati Technologies Pvt Ltd.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/i2c.h>
#include <linux/timer.h>

#define EVENT_PENDOWN 1
#define EVENT_REPEAT  2
#define EVENT_PENUP   3

struct migor_ts_priv {
	struct i2c_client *client;
	struct input_dev *input;
	int irq;
};

static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
					       0x01, 0x06, 0x07, };
static const u_int8_t migor_ts_dis_seq[17] = { };

static irqreturn_t migor_ts_isr(int irq, void *dev_id)
{
	struct migor_ts_priv *priv = dev_id;
	unsigned short xpos, ypos;
	unsigned char event;
	u_int8_t buf[16];

	/*
	 * The touch screen controller chip is hooked up to the CPU
	 * using I2C and a single interrupt line. The interrupt line
	 * is pulled low whenever someone taps the screen. To deassert
	 * the interrupt line we need to acknowledge the interrupt by
	 * communicating with the controller over the slow i2c bus.
	 *
	 * Since I2C bus controller may sleep we are using threaded
	 * IRQ here.
	 */

	memset(buf, 0, sizeof(buf));

	/* Set Index 0 */
	buf[0] = 0;
	if (i2c_master_send(priv->client, buf, 1) != 1) {
		dev_err(&priv->client->dev, "Unable to write i2c index\n");
		goto out;
	}

	/* Now do Page Read */
	if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
		dev_err(&priv->client->dev, "Unable to read i2c page\n");
		goto out;
	}

	ypos = ((buf[9] & 0x03) << 8 | buf[8]);
	xpos = ((buf[11] & 0x03) << 8 | buf[10]);
	event = buf[12];

	switch (event) {
	case EVENT_PENDOWN:
	case EVENT_REPEAT:
		input_report_key(priv->input, BTN_TOUCH, 1);
		input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/
		input_report_abs(priv->input, ABS_Y, xpos);
		input_sync(priv->input);
		break;

	case EVENT_PENUP:
		input_report_key(priv->input, BTN_TOUCH, 0);
		input_sync(priv->input);
		break;
	}

 out:
	return IRQ_HANDLED;
}

static int migor_ts_open(struct input_dev *dev)
{
	struct migor_ts_priv *priv = input_get_drvdata(dev);
	struct i2c_client *client = priv->client;
	int count;

	/* enable controller */
	count = i2c_master_send(client, migor_ts_ena_seq,
				sizeof(migor_ts_ena_seq));
	if (count != sizeof(migor_ts_ena_seq)) {
		dev_err(&client->dev, "Unable to enable touchscreen.\n");
		return -ENXIO;
	}

	return 0;
}

static void migor_ts_close(struct input_dev *dev)
{
	struct migor_ts_priv *priv = input_get_drvdata(dev);
	struct i2c_client *client = priv->client;

	disable_irq(priv->irq);

	/* disable controller */
	i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));

	enable_irq(priv->irq);
}

static int migor_ts_probe(struct i2c_client *client)
{
	struct migor_ts_priv *priv;
	struct input_dev *input;
	int error;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	input = input_allocate_device();
	if (!priv || !input) {
		dev_err(&client->dev, "failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	priv->client = client;
	priv->input = input;
	priv->irq = client->irq;

	input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

	__set_bit(BTN_TOUCH, input->keybit);

	input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
	input_set_abs_params(input, ABS_Y, 85, 935, 0, 0);

	input->name = client->name;
	input->id.bustype = BUS_I2C;
	input->dev.parent = &client->dev;

	input->open = migor_ts_open;
	input->close = migor_ts_close;

	input_set_drvdata(input, priv);

	error = request_threaded_irq(priv->irq, NULL, migor_ts_isr,
                                     IRQF_TRIGGER_LOW | IRQF_ONESHOT,
                                     client->name, priv);
	if (error) {
		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
		goto err_free_mem;
	}

	error = input_register_device(input);
	if (error)
		goto err_free_irq;

	i2c_set_clientdata(client, priv);
	device_init_wakeup(&client->dev, 1);

	return 0;

 err_free_irq:
	free_irq(priv->irq, priv);
 err_free_mem:
	input_free_device(input);
	kfree(priv);
	return error;
}

static void migor_ts_remove(struct i2c_client *client)
{
	struct migor_ts_priv *priv = i2c_get_clientdata(client);

	free_irq(priv->irq, priv);
	input_unregister_device(priv->input);
	kfree(priv);

	dev_set_drvdata(&client->dev, NULL);
}

static int migor_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct migor_ts_priv *priv = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		enable_irq_wake(priv->irq);

	return 0;
}

static int migor_ts_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct migor_ts_priv *priv = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		disable_irq_wake(priv->irq);

	return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);

static const struct i2c_device_id migor_ts_id[] = {
	{ "migor_ts" },
	{ }
};
MODULE_DEVICE_TABLE(i2c, migor_ts_id);

static struct i2c_driver migor_ts_driver = {
	.driver = {
		.name = "migor_ts",
		.pm = pm_sleep_ptr(&migor_ts_pm),
	},
	.probe = migor_ts_probe,
	.remove = migor_ts_remove,
	.id_table = migor_ts_id,
};

module_i2c_driver(migor_ts_driver);

MODULE_DESCRIPTION("MigoR Touchscreen driver");
MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
MODULE_LICENSE("GPL");
Commit	Line	Data
dda2af74	1	// SPDX-License-Identifier: GPL-2.0+
885c316d MD	2	/*
	3	* Touch Screen driver for Renesas MIGO-R Platform
	4	*
	5	* Copyright (c) 2008 Magnus Damm
	6	* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
	7	* Kenati Technologies Pvt Ltd.
885c316d MD	8	*/
	9	#include <linux/module.h>
	10	#include <linux/kernel.h>
	11	#include <linux/input.h>
	12	#include <linux/interrupt.h>
d72e64ec	13	#include <linux/pm.h>
5a0e3ad6	14	#include <linux/slab.h>
885c316d MD	15	#include <asm/io.h>
	16	#include <linux/i2c.h>
	17	#include <linux/timer.h>
	18
	19	#define EVENT_PENDOWN 1
	20	#define EVENT_REPEAT 2
	21	#define EVENT_PENUP 3
	22
	23	struct migor_ts_priv {
	24	struct i2c_client *client;
	25	struct input_dev *input;
885c316d MD	26	int irq;
	27	};
	28
	29	static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
	30	0x01, 0x06, 0x07, };
	31	static const u_int8_t migor_ts_dis_seq[17] = { };
	32
468792eb	33	static irqreturn_t migor_ts_isr(int irq, void *dev_id)
885c316d	34	{
468792eb	35	struct migor_ts_priv *priv = dev_id;
885c316d MD	36	unsigned short xpos, ypos;
	37	unsigned char event;
	38	u_int8_t buf[16];
	39
468792eb DT	40	/*
	41	* The touch screen controller chip is hooked up to the CPU
	42	* using I2C and a single interrupt line. The interrupt line
	43	* is pulled low whenever someone taps the screen. To deassert
	44	* the interrupt line we need to acknowledge the interrupt by
	45	* communicating with the controller over the slow i2c bus.
	46	*
	47	* Since I2C bus controller may sleep we are using threaded
	48	* IRQ here.
	49	*/
	50
885c316d MD	51	memset(buf, 0, sizeof(buf));
	52
	53	/* Set Index 0 */
	54	buf[0] = 0;
	55	if (i2c_master_send(priv->client, buf, 1) != 1) {
	56	dev_err(&priv->client->dev, "Unable to write i2c index\n");
	57	goto out;
	58	}
	59
	60	/* Now do Page Read */
	61	if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
	62	dev_err(&priv->client->dev, "Unable to read i2c page\n");
	63	goto out;
	64	}
	65
	66	ypos = ((buf[9] & 0x03) << 8 \| buf[8]);
	67	xpos = ((buf[11] & 0x03) << 8 \| buf[10]);
	68	event = buf[12];
	69
468792eb DT	70	switch (event) {
	71	case EVENT_PENDOWN:
	72	case EVENT_REPEAT:
885c316d MD	73	input_report_key(priv->input, BTN_TOUCH, 1);
	74	input_report_abs(priv->input, ABS_X, ypos); /X-Y swap/
	75	input_report_abs(priv->input, ABS_Y, xpos);
	76	input_sync(priv->input);
468792eb DT	77	break;
	78
	79	case EVENT_PENUP:
885c316d MD	80	input_report_key(priv->input, BTN_TOUCH, 0);
885c316d MD	81	input_sync(priv->input);
468792eb	82	break;
885c316d	83	}
885c316d	84
468792eb	85	out:
885c316d MD	86	return IRQ_HANDLED;
	87	}
	88
885c316d MD	89	static int migor_ts_open(struct input_dev *dev)
	90	{
	91	struct migor_ts_priv *priv = input_get_drvdata(dev);
	92	struct i2c_client *client = priv->client;
	93	int count;
	94
	95	/* enable controller */
	96	count = i2c_master_send(client, migor_ts_ena_seq,
	97	sizeof(migor_ts_ena_seq));
	98	if (count != sizeof(migor_ts_ena_seq)) {
	99	dev_err(&client->dev, "Unable to enable touchscreen.\n");
	100	return -ENXIO;
	101	}
	102
	103	return 0;
	104	}
	105
	106	static void migor_ts_close(struct input_dev *dev)
	107	{
	108	struct migor_ts_priv *priv = input_get_drvdata(dev);
	109	struct i2c_client *client = priv->client;
	110
	111	disable_irq(priv->irq);
	112
885c316d MD	113	/* disable controller */
	114	i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));
	115
	116	enable_irq(priv->irq);
	117	}
	118
ff3de863	119	static int migor_ts_probe(struct i2c_client *client)
885c316d MD	120	{
	121	struct migor_ts_priv *priv;
	122	struct input_dev *input;
	123	int error;
	124
	125	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
885c316d	126	input = input_allocate_device();
ff4d0492 DT	127	if (!priv \|\| !input) {
ff4d0492 DT	128	dev_err(&client->dev, "failed to allocate memory\n");
885c316d	129	error = -ENOMEM;
ff4d0492	130	goto err_free_mem;
885c316d MD	131	}
885c316d MD	132
ff4d0492 DT	133	priv->client = client;
	134	priv->input = input;
	135	priv->irq = client->irq;
	136
885c316d	137	input->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
ff4d0492 DT	138
ff4d0492 DT	139	__set_bit(BTN_TOUCH, input->keybit);
885c316d MD	140
	141	input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
	142	input_set_abs_params(input, ABS_Y, 85, 935, 0, 0);
	143
b6ce9ad0	144	input->name = client->name;
885c316d MD	145	input->id.bustype = BUS_I2C;
	146	input->dev.parent = &client->dev;
	147
	148	input->open = migor_ts_open;
	149	input->close = migor_ts_close;
	150
	151	input_set_drvdata(input, priv);
	152
468792eb DT	153	error = request_threaded_irq(priv->irq, NULL, migor_ts_isr,
	154	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	155	client->name, priv);
885c316d MD	156	if (error) {
885c316d MD	157	dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
ff4d0492	158	goto err_free_mem;
885c316d MD	159	}
885c316d MD	160
ff4d0492 DT	161	error = input_register_device(input);
	162	if (error)
	163	goto err_free_irq;
	164
ec208612	165	i2c_set_clientdata(client, priv);
0935ade0	166	device_init_wakeup(&client->dev, 1);
ff4d0492	167
885c316d MD	168	return 0;
885c316d MD	169
ff4d0492 DT	170	err_free_irq:
	171	free_irq(priv->irq, priv);
	172	err_free_mem:
885c316d MD	173	input_free_device(input);
885c316d MD	174	kfree(priv);
885c316d MD	175	return error;
	176	}
	177
ed5c2f5f	178	static void migor_ts_remove(struct i2c_client *client)
885c316d	179	{
ec208612	180	struct migor_ts_priv *priv = i2c_get_clientdata(client);
885c316d MD	181
	182	free_irq(priv->irq, priv);
	183	input_unregister_device(priv->input);
	184	kfree(priv);
	185
	186	dev_set_drvdata(&client->dev, NULL);
885c316d MD	187	}
885c316d MD	188
3a841b3e	189	static int migor_ts_suspend(struct device *dev)
0935ade0	190	{
d72e64ec	191	struct i2c_client *client = to_i2c_client(dev);
ec208612	192	struct migor_ts_priv *priv = i2c_get_clientdata(client);
0935ade0 MD	193
	194	if (device_may_wakeup(&client->dev))
	195	enable_irq_wake(priv->irq);
	196
	197	return 0;
	198	}
	199
3a841b3e	200	static int migor_ts_resume(struct device *dev)
0935ade0	201	{
d72e64ec	202	struct i2c_client *client = to_i2c_client(dev);
ec208612	203	struct migor_ts_priv *priv = i2c_get_clientdata(client);
0935ade0 MD	204
	205	if (device_may_wakeup(&client->dev))
	206	disable_irq_wake(priv->irq);
	207
	208	return 0;
	209	}
	210
3a841b3e	211	static DEFINE_SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);
d72e64ec	212
b6ce9ad0	213	static const struct i2c_device_id migor_ts_id[] = {
5852f2af	214	{ "migor_ts" },
b6ce9ad0 MD	215	{ }
b6ce9ad0 MD	216	};
8f4decc3	217	MODULE_DEVICE_TABLE(i2c, migor_ts_id);
b6ce9ad0	218
885c316d MD	219	static struct i2c_driver migor_ts_driver = {
	220	.driver = {
	221	.name = "migor_ts",
3a841b3e	222	.pm = pm_sleep_ptr(&migor_ts_pm),
885c316d	223	},
d8bde56d	224	.probe = migor_ts_probe,
885c316d	225	.remove = migor_ts_remove,
b6ce9ad0	226	.id_table = migor_ts_id,
885c316d MD	227	};
885c316d MD	228
1b92c1cf	229	module_i2c_driver(migor_ts_driver);
885c316d MD	230
	231	MODULE_DESCRIPTION("MigoR Touchscreen driver");
	232	MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
	233	MODULE_LICENSE("GPL");