[mirror_ubuntu-focal-kernel.git] / drivers / input / touchscreen / cy8ctmg110_ts.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for cypress touch screen controller
 *
 * Copyright (c) 2009 Aava Mobile
 *
 * Some cleanups by Alan Cox <alan@linux.intel.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/input/cy8ctmg110_pdata.h>

#define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"

/* Touch coordinates */
#define CY8CTMG110_X_MIN		0
#define CY8CTMG110_Y_MIN		0
#define CY8CTMG110_X_MAX		759
#define CY8CTMG110_Y_MAX		465


/* cy8ctmg110 register definitions */
#define CY8CTMG110_TOUCH_WAKEUP_TIME	0
#define CY8CTMG110_TOUCH_SLEEP_TIME	2
#define CY8CTMG110_TOUCH_X1		3
#define CY8CTMG110_TOUCH_Y1		5
#define CY8CTMG110_TOUCH_X2		7
#define CY8CTMG110_TOUCH_Y2		9
#define CY8CTMG110_FINGERS		11
#define CY8CTMG110_GESTURE		12
#define CY8CTMG110_REG_MAX		13


/*
 * The touch driver structure.
 */
struct cy8ctmg110 {
	struct input_dev *input;
	char phys[32];
	struct i2c_client *client;
	int reset_pin;
	int irq_pin;
};

/*
 * cy8ctmg110_power is the routine that is called when touch hardware
 * will powered off or on.
 */
static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
{
	if (ts->reset_pin)
		gpio_direction_output(ts->reset_pin, 1 - poweron);
}

static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
		unsigned char len, unsigned char *value)
{
	struct i2c_client *client = tsc->client;
	int ret;
	unsigned char i2c_data[6];

	BUG_ON(len > 5);

	i2c_data[0] = reg;
	memcpy(i2c_data + 1, value, len);

	ret = i2c_master_send(client, i2c_data, len + 1);
	if (ret != len + 1) {
		dev_err(&client->dev, "i2c write data cmd failed\n");
		return ret < 0 ? ret : -EIO;
	}

	return 0;
}

static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
		unsigned char *data, unsigned char len, unsigned char cmd)
{
	struct i2c_client *client = tsc->client;
	int ret;
	struct i2c_msg msg[2] = {
		/* first write slave position to i2c devices */
		{
			.addr = client->addr,
			.len = 1,
			.buf = &cmd
		},
		/* Second read data from position */
		{
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = len,
			.buf = data
		}
	};

	ret = i2c_transfer(client->adapter, msg, 2);
	if (ret < 0)
		return ret;

	return 0;
}

static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
{
	struct input_dev *input = tsc->input;
	unsigned char reg_p[CY8CTMG110_REG_MAX];
	int x, y;

	memset(reg_p, 0, CY8CTMG110_REG_MAX);

	/* Reading coordinates */
	if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
		return -EIO;

	y = reg_p[2] << 8 | reg_p[3];
	x = reg_p[0] << 8 | reg_p[1];

	/* Number of touch */
	if (reg_p[8] == 0) {
		input_report_key(input, BTN_TOUCH, 0);
	} else  {
		input_report_key(input, BTN_TOUCH, 1);
		input_report_abs(input, ABS_X, x);
		input_report_abs(input, ABS_Y, y);
	}

	input_sync(input);

	return 0;
}

static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
{
	unsigned char reg_p[3];

	if (sleep) {
		reg_p[0] = 0x00;
		reg_p[1] = 0xff;
		reg_p[2] = 5;
	} else {
		reg_p[0] = 0x10;
		reg_p[1] = 0xff;
		reg_p[2] = 0;
	}

	return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
}

static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
{
	struct cy8ctmg110 *tsc = dev_id;

	cy8ctmg110_touch_pos(tsc);

	return IRQ_HANDLED;
}

static int cy8ctmg110_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev);
	struct cy8ctmg110 *ts;
	struct input_dev *input_dev;
	int err;

	/* No pdata no way forward */
	if (pdata == NULL) {
		dev_err(&client->dev, "no pdata\n");
		return -ENODEV;
	}

	if (!i2c_check_functionality(client->adapter,
					I2C_FUNC_SMBUS_READ_WORD_DATA))
		return -EIO;

	ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ts || !input_dev) {
		err = -ENOMEM;
		goto err_free_mem;
	}

	ts->client = client;
	ts->input = input_dev;
	ts->reset_pin = pdata->reset_pin;
	ts->irq_pin = pdata->irq_pin;

	snprintf(ts->phys, sizeof(ts->phys),
		 "%s/input0", dev_name(&client->dev));

	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
	input_dev->phys = ts->phys;
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	input_set_abs_params(input_dev, ABS_X,
			CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
	input_set_abs_params(input_dev, ABS_Y,
			CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);

	if (ts->reset_pin) {
		err = gpio_request(ts->reset_pin, NULL);
		if (err) {
			dev_err(&client->dev,
				"Unable to request GPIO pin %d.\n",
				ts->reset_pin);
			goto err_free_mem;
		}
	}

	cy8ctmg110_power(ts, true);
	cy8ctmg110_set_sleepmode(ts, false);

	err = gpio_request(ts->irq_pin, "touch_irq_key");
	if (err < 0) {
		dev_err(&client->dev,
			"Failed to request GPIO %d, error %d\n",
			ts->irq_pin, err);
		goto err_shutoff_device;
	}

	err = gpio_direction_input(ts->irq_pin);
	if (err < 0) {
		dev_err(&client->dev,
			"Failed to configure input direction for GPIO %d, error %d\n",
			ts->irq_pin, err);
		goto err_free_irq_gpio;
	}

	client->irq = gpio_to_irq(ts->irq_pin);
	if (client->irq < 0) {
		err = client->irq;
		dev_err(&client->dev,
			"Unable to get irq number for GPIO %d, error %d\n",
			ts->irq_pin, err);
		goto err_free_irq_gpio;
	}

	err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
				   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
				   "touch_reset_key", ts);
	if (err < 0) {
		dev_err(&client->dev,
			"irq %d busy? error %d\n", client->irq, err);
		goto err_free_irq_gpio;
	}

	err = input_register_device(input_dev);
	if (err)
		goto err_free_irq;

	i2c_set_clientdata(client, ts);
	device_init_wakeup(&client->dev, 1);
	return 0;

err_free_irq:
	free_irq(client->irq, ts);
err_free_irq_gpio:
	gpio_free(ts->irq_pin);
err_shutoff_device:
	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);
	if (ts->reset_pin)
		gpio_free(ts->reset_pin);
err_free_mem:
	input_free_device(input_dev);
	kfree(ts);
	return err;
}

static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		enable_irq_wake(client->irq);
	else {
		cy8ctmg110_set_sleepmode(ts, true);
		cy8ctmg110_power(ts, false);
	}
	return 0;
}

static int __maybe_unused cy8ctmg110_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);
	else {
		cy8ctmg110_power(ts, true);
		cy8ctmg110_set_sleepmode(ts, false);
	}
	return 0;
}

static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);

static int cy8ctmg110_remove(struct i2c_client *client)
{
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);

	free_irq(client->irq, ts);
	input_unregister_device(ts->input);
	gpio_free(ts->irq_pin);
	if (ts->reset_pin)
		gpio_free(ts->reset_pin);
	kfree(ts);

	return 0;
}

static const struct i2c_device_id cy8ctmg110_idtable[] = {
	{ CY8CTMG110_DRIVER_NAME, 1 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);

static struct i2c_driver cy8ctmg110_driver = {
	.driver		= {
		.name	= CY8CTMG110_DRIVER_NAME,
		.pm	= &cy8ctmg110_pm,
	},
	.id_table	= cy8ctmg110_idtable,
	.probe		= cy8ctmg110_probe,
	.remove		= cy8ctmg110_remove,
};

module_i2c_driver(cy8ctmg110_driver);

MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
82c29810	1	// SPDX-License-Identifier: GPL-2.0-only
60347c19 SK	2	/*
	3	* Driver for cypress touch screen controller
	4	*
	5	* Copyright (c) 2009 Aava Mobile
	6	*
	7	* Some cleanups by Alan Cox <alan@linux.intel.com>
60347c19 SK	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/input.h>
	13	#include <linux/slab.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/io.h>
	16	#include <linux/i2c.h>
	17	#include <linux/gpio.h>
	18	#include <linux/input/cy8ctmg110_pdata.h>
	19
	20	#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
	21
	22	/* Touch coordinates */
	23	#define CY8CTMG110_X_MIN 0
	24	#define CY8CTMG110_Y_MIN 0
	25	#define CY8CTMG110_X_MAX 759
	26	#define CY8CTMG110_Y_MAX 465
	27
	28
	29	/* cy8ctmg110 register definitions */
	30	#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
	31	#define CY8CTMG110_TOUCH_SLEEP_TIME 2
	32	#define CY8CTMG110_TOUCH_X1 3
	33	#define CY8CTMG110_TOUCH_Y1 5
	34	#define CY8CTMG110_TOUCH_X2 7
	35	#define CY8CTMG110_TOUCH_Y2 9
	36	#define CY8CTMG110_FINGERS 11
	37	#define CY8CTMG110_GESTURE 12
	38	#define CY8CTMG110_REG_MAX 13
	39
	40
	41	/*
	42	* The touch driver structure.
	43	*/
	44	struct cy8ctmg110 {
	45	struct input_dev *input;
	46	char phys[32];
	47	struct i2c_client *client;
	48	int reset_pin;
	49	int irq_pin;
	50	};
	51
	52	/*
	53	* cy8ctmg110_power is the routine that is called when touch hardware
	54	* will powered off or on.
	55	*/
	56	static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
	57	{
	58	if (ts->reset_pin)
	59	gpio_direction_output(ts->reset_pin, 1 - poweron);
	60	}
	61
	62	static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
	63	unsigned char len, unsigned char *value)
	64	{
	65	struct i2c_client *client = tsc->client;
f1b50760	66	int ret;
60347c19 SK	67	unsigned char i2c_data[6];
	68
	69	BUG_ON(len > 5);
	70
	71	i2c_data[0] = reg;
	72	memcpy(i2c_data + 1, value, len);
	73
	74	ret = i2c_master_send(client, i2c_data, len + 1);
21184c4e	75	if (ret != len + 1) {
60347c19	76	dev_err(&client->dev, "i2c write data cmd failed\n");
21184c4e	77	return ret < 0 ? ret : -EIO;
60347c19 SK	78	}
	79
	80	return 0;
	81	}
	82
	83	static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
	84	unsigned char *data, unsigned char len, unsigned char cmd)
	85	{
	86	struct i2c_client *client = tsc->client;
f1b50760	87	int ret;
60347c19 SK	88	struct i2c_msg msg[2] = {
60347c19 SK	89	/* first write slave position to i2c devices */
9493d974 SD	90	{
	91	.addr = client->addr,
	92	.len = 1,
	93	.buf = &cmd
	94	},
60347c19	95	/* Second read data from position */
9493d974 SD	96	{
	97	.addr = client->addr,
	98	.flags = I2C_M_RD,
	99	.len = len,
	100	.buf = data
	101	}
60347c19 SK	102	};
	103
	104	ret = i2c_transfer(client->adapter, msg, 2);
	105	if (ret < 0)
	106	return ret;
	107
	108	return 0;
	109	}
	110
	111	static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
	112	{
	113	struct input_dev *input = tsc->input;
	114	unsigned char reg_p[CY8CTMG110_REG_MAX];
	115	int x, y;
	116
	117	memset(reg_p, 0, CY8CTMG110_REG_MAX);
	118
	119	/* Reading coordinates */
	120	if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
	121	return -EIO;
	122
	123	y = reg_p[2] << 8 \| reg_p[3];
	124	x = reg_p[0] << 8 \| reg_p[1];
	125
	126	/* Number of touch */
	127	if (reg_p[8] == 0) {
	128	input_report_key(input, BTN_TOUCH, 0);
	129	} else {
	130	input_report_key(input, BTN_TOUCH, 1);
	131	input_report_abs(input, ABS_X, x);
	132	input_report_abs(input, ABS_Y, y);
	133	}
	134
	135	input_sync(input);
	136
	137	return 0;
	138	}
	139
	140	static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
	141	{
	142	unsigned char reg_p[3];
	143
	144	if (sleep) {
	145	reg_p[0] = 0x00;
	146	reg_p[1] = 0xff;
	147	reg_p[2] = 5;
	148	} else {
	149	reg_p[0] = 0x10;
	150	reg_p[1] = 0xff;
	151	reg_p[2] = 0;
	152	}
	153
	154	return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
	155	}
	156
	157	static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
	158	{
	159	struct cy8ctmg110 *tsc = dev_id;
	160
	161	cy8ctmg110_touch_pos(tsc);
	162
	163	return IRQ_HANDLED;
	164	}
	165
5298cc4c	166	static int cy8ctmg110_probe(struct i2c_client *client,
60347c19 SK	167	const struct i2c_device_id *id)
60347c19 SK	168	{
c838cb3d	169	const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev);
60347c19 SK	170	struct cy8ctmg110 *ts;
	171	struct input_dev *input_dev;
	172	int err;
	173
	174	/* No pdata no way forward */
	175	if (pdata == NULL) {
	176	dev_err(&client->dev, "no pdata\n");
	177	return -ENODEV;
	178	}
	179
	180	if (!i2c_check_functionality(client->adapter,
	181	I2C_FUNC_SMBUS_READ_WORD_DATA))
	182	return -EIO;
	183
	184	ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
	185	input_dev = input_allocate_device();
	186	if (!ts \|\| !input_dev) {
	187	err = -ENOMEM;
	188	goto err_free_mem;
	189	}
	190
	191	ts->client = client;
	192	ts->input = input_dev;
2c204109 AL	193	ts->reset_pin = pdata->reset_pin;
2c204109 AL	194	ts->irq_pin = pdata->irq_pin;
60347c19 SK	195
	196	snprintf(ts->phys, sizeof(ts->phys),
	197	"%s/input0", dev_name(&client->dev));
	198
	199	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
	200	input_dev->phys = ts->phys;
	201	input_dev->id.bustype = BUS_I2C;
	202	input_dev->dev.parent = &client->dev;
	203
	204	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	205	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	206
	207	input_set_abs_params(input_dev, ABS_X,
a4e6aad6	208	CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
60347c19	209	input_set_abs_params(input_dev, ABS_Y,
a4e6aad6	210	CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
60347c19 SK	211
	212	if (ts->reset_pin) {
	213	err = gpio_request(ts->reset_pin, NULL);
	214	if (err) {
	215	dev_err(&client->dev,
	216	"Unable to request GPIO pin %d.\n",
	217	ts->reset_pin);
	218	goto err_free_mem;
	219	}
	220	}
	221
	222	cy8ctmg110_power(ts, true);
	223	cy8ctmg110_set_sleepmode(ts, false);
	224
	225	err = gpio_request(ts->irq_pin, "touch_irq_key");
	226	if (err < 0) {
	227	dev_err(&client->dev,
	228	"Failed to request GPIO %d, error %d\n",
	229	ts->irq_pin, err);
	230	goto err_shutoff_device;
	231	}
	232
	233	err = gpio_direction_input(ts->irq_pin);
	234	if (err < 0) {
	235	dev_err(&client->dev,
	236	"Failed to configure input direction for GPIO %d, error %d\n",
	237	ts->irq_pin, err);
	238	goto err_free_irq_gpio;
	239	}
	240
	241	client->irq = gpio_to_irq(ts->irq_pin);
	242	if (client->irq < 0) {
	243	err = client->irq;
	244	dev_err(&client->dev,
	245	"Unable to get irq number for GPIO %d, error %d\n",
	246	ts->irq_pin, err);
	247	goto err_free_irq_gpio;
	248	}
	249
	250	err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
9b7e31bb LPC	251	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
9b7e31bb LPC	252	"touch_reset_key", ts);
60347c19 SK	253	if (err < 0) {
	254	dev_err(&client->dev,
	255	"irq %d busy? error %d\n", client->irq, err);
	256	goto err_free_irq_gpio;
	257	}
	258
	259	err = input_register_device(input_dev);
	260	if (err)
	261	goto err_free_irq;
	262
	263	i2c_set_clientdata(client, ts);
	264	device_init_wakeup(&client->dev, 1);
	265	return 0;
	266
	267	err_free_irq:
	268	free_irq(client->irq, ts);
	269	err_free_irq_gpio:
	270	gpio_free(ts->irq_pin);
	271	err_shutoff_device:
	272	cy8ctmg110_set_sleepmode(ts, true);
	273	cy8ctmg110_power(ts, false);
	274	if (ts->reset_pin)
	275	gpio_free(ts->reset_pin);
	276	err_free_mem:
	277	input_free_device(input_dev);
	278	kfree(ts);
	279	return err;
	280	}
	281
02b6a58b	282	static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
60347c19	283	{
93f38e91	284	struct i2c_client *client = to_i2c_client(dev);
60347c19 SK	285	struct cy8ctmg110 *ts = i2c_get_clientdata(client);
	286
	287	if (device_may_wakeup(&client->dev))
	288	enable_irq_wake(client->irq);
	289	else {
	290	cy8ctmg110_set_sleepmode(ts, true);
	291	cy8ctmg110_power(ts, false);
	292	}
	293	return 0;
	294	}
	295
02b6a58b	296	static int __maybe_unused cy8ctmg110_resume(struct device *dev)
60347c19	297	{
93f38e91	298	struct i2c_client *client = to_i2c_client(dev);
60347c19 SK	299	struct cy8ctmg110 *ts = i2c_get_clientdata(client);
	300
	301	if (device_may_wakeup(&client->dev))
	302	disable_irq_wake(client->irq);
	303	else {
	304	cy8ctmg110_power(ts, true);
	305	cy8ctmg110_set_sleepmode(ts, false);
	306	}
	307	return 0;
	308	}
93f38e91 MB	309
93f38e91 MB	310	static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
60347c19	311
e2619cf7	312	static int cy8ctmg110_remove(struct i2c_client *client)
60347c19 SK	313	{
	314	struct cy8ctmg110 *ts = i2c_get_clientdata(client);
	315
	316	cy8ctmg110_set_sleepmode(ts, true);
	317	cy8ctmg110_power(ts, false);
	318
	319	free_irq(client->irq, ts);
	320	input_unregister_device(ts->input);
	321	gpio_free(ts->irq_pin);
	322	if (ts->reset_pin)
	323	gpio_free(ts->reset_pin);
	324	kfree(ts);
	325
	326	return 0;
	327	}
	328
d448303a	329	static const struct i2c_device_id cy8ctmg110_idtable[] = {
60347c19 SK	330	{ CY8CTMG110_DRIVER_NAME, 1 },
	331	{ }
	332	};
	333
	334	MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
	335
	336	static struct i2c_driver cy8ctmg110_driver = {
	337	.driver = {
60347c19	338	.name = CY8CTMG110_DRIVER_NAME,
93f38e91	339	.pm = &cy8ctmg110_pm,
60347c19 SK	340	},
	341	.id_table = cy8ctmg110_idtable,
	342	.probe = cy8ctmg110_probe,
1cb0aa88	343	.remove = cy8ctmg110_remove,
60347c19 SK	344	};
60347c19 SK	345
1b92c1cf	346	module_i2c_driver(cy8ctmg110_driver);
60347c19 SK	347
	348	MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
	349	MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
	350	MODULE_LICENSE("GPL v2");