[mirror_ubuntu-jammy-kernel.git] / drivers / input / keyboard / qt2160.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  qt2160.c - Atmel AT42QT2160 Touch Sense Controller
 *
 *  Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
 */

#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/input.h>

#define QT2160_VALID_CHIPID  0x11

#define QT2160_CMD_CHIPID     0
#define QT2160_CMD_CODEVER    1
#define QT2160_CMD_GSTAT      2
#define QT2160_CMD_KEYS3      3
#define QT2160_CMD_KEYS4      4
#define QT2160_CMD_SLIDE      5
#define QT2160_CMD_GPIOS      6
#define QT2160_CMD_SUBVER     7
#define QT2160_CMD_CALIBRATE  10
#define QT2160_CMD_DRIVE_X    70
#define QT2160_CMD_PWMEN_X    74
#define QT2160_CMD_PWM_DUTY   76

#define QT2160_NUM_LEDS_X	8

#define QT2160_CYCLE_INTERVAL	(2*HZ)

static unsigned char qt2160_key2code[] = {
	KEY_0, KEY_1, KEY_2, KEY_3,
	KEY_4, KEY_5, KEY_6, KEY_7,
	KEY_8, KEY_9, KEY_A, KEY_B,
	KEY_C, KEY_D, KEY_E, KEY_F,
};

#ifdef CONFIG_LEDS_CLASS
struct qt2160_led {
	struct qt2160_data *qt2160;
	struct led_classdev cdev;
	char name[32];
	int id;
	enum led_brightness brightness;
};
#endif

struct qt2160_data {
	struct i2c_client *client;
	struct input_dev *input;
	struct delayed_work dwork;
	unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
	u16 key_matrix;
#ifdef CONFIG_LEDS_CLASS
	struct qt2160_led leds[QT2160_NUM_LEDS_X];
#endif
};

static int qt2160_read(struct i2c_client *client, u8 reg);
static int qt2160_write(struct i2c_client *client, u8 reg, u8 data);

#ifdef CONFIG_LEDS_CLASS

static int qt2160_led_set(struct led_classdev *cdev,
			  enum led_brightness value)
{
	struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev);
	struct qt2160_data *qt2160 = led->qt2160;
	struct i2c_client *client = qt2160->client;
	u32 drive, pwmen;

	if (value != led->brightness) {
		drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
		pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
		if (value != LED_OFF) {
			drive |= BIT(led->id);
			pwmen |= BIT(led->id);

		} else {
			drive &= ~BIT(led->id);
			pwmen &= ~BIT(led->id);
		}
		qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
		qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);

		/*
		 * Changing this register will change the brightness
		 * of every LED in the qt2160. It's a HW limitation.
		 */
		if (value != LED_OFF)
			qt2160_write(client, QT2160_CMD_PWM_DUTY, value);

		led->brightness = value;
	}

	return 0;
}

#endif /* CONFIG_LEDS_CLASS */

static int qt2160_read_block(struct i2c_client *client,
			     u8 inireg, u8 *buffer, unsigned int count)
{
	int error, idx = 0;

	/*
	 * Can't use SMBus block data read. Check for I2C functionality to speed
	 * things up whenever possible. Otherwise we will be forced to read
	 * sequentially.
	 */
	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))	{

		error = i2c_smbus_write_byte(client, inireg + idx);
		if (error) {
			dev_err(&client->dev,
				"couldn't send request. Returned %d\n", error);
			return error;
		}

		error = i2c_master_recv(client, buffer, count);
		if (error != count) {
			dev_err(&client->dev,
				"couldn't read registers. Returned %d bytes\n", error);
			return error;
		}
	} else {

		while (count--) {
			int data;

			error = i2c_smbus_write_byte(client, inireg + idx);
			if (error) {
				dev_err(&client->dev,
					"couldn't send request. Returned %d\n", error);
				return error;
			}

			data = i2c_smbus_read_byte(client);
			if (data < 0) {
				dev_err(&client->dev,
					"couldn't read register. Returned %d\n", data);
				return data;
			}

			buffer[idx++] = data;
		}
	}

	return 0;
}

static int qt2160_get_key_matrix(struct qt2160_data *qt2160)
{
	struct i2c_client *client = qt2160->client;
	struct input_dev *input = qt2160->input;
	u8 regs[6];
	u16 old_matrix, new_matrix;
	int ret, i, mask;

	dev_dbg(&client->dev, "requesting keys...\n");

	/*
	 * Read all registers from General Status Register
	 * to GPIOs register
	 */
	ret = qt2160_read_block(client, QT2160_CMD_GSTAT, regs, 6);
	if (ret) {
		dev_err(&client->dev,
			"could not perform chip read.\n");
		return ret;
	}

	old_matrix = qt2160->key_matrix;
	qt2160->key_matrix = new_matrix = (regs[2] << 8) | regs[1];

	mask = 0x01;
	for (i = 0; i < 16; ++i, mask <<= 1) {
		int keyval = new_matrix & mask;

		if ((old_matrix & mask) != keyval) {
			input_report_key(input, qt2160->keycodes[i], keyval);
			dev_dbg(&client->dev, "key %d %s\n",
				i, keyval ? "pressed" : "released");
		}
	}

	input_sync(input);

	return 0;
}

static irqreturn_t qt2160_irq(int irq, void *_qt2160)
{
	struct qt2160_data *qt2160 = _qt2160;

	mod_delayed_work(system_wq, &qt2160->dwork, 0);

	return IRQ_HANDLED;
}

static void qt2160_schedule_read(struct qt2160_data *qt2160)
{
	schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
}

static void qt2160_worker(struct work_struct *work)
{
	struct qt2160_data *qt2160 =
		container_of(work, struct qt2160_data, dwork.work);

	dev_dbg(&qt2160->client->dev, "worker\n");

	qt2160_get_key_matrix(qt2160);

	/* Avoid device lock up by checking every so often */
	qt2160_schedule_read(qt2160);
}

static int qt2160_read(struct i2c_client *client, u8 reg)
{
	int ret;

	ret = i2c_smbus_write_byte(client, reg);
	if (ret) {
		dev_err(&client->dev,
			"couldn't send request. Returned %d\n", ret);
		return ret;
	}

	ret = i2c_smbus_read_byte(client);
	if (ret < 0) {
		dev_err(&client->dev,
			"couldn't read register. Returned %d\n", ret);
		return ret;
	}

	return ret;
}

static int qt2160_write(struct i2c_client *client, u8 reg, u8 data)
{
	int ret;

	ret = i2c_smbus_write_byte_data(client, reg, data);
	if (ret < 0)
		dev_err(&client->dev,
			"couldn't write data. Returned %d\n", ret);

	return ret;
}

#ifdef CONFIG_LEDS_CLASS

static int qt2160_register_leds(struct qt2160_data *qt2160)
{
	struct i2c_client *client = qt2160->client;
	int ret;
	int i;

	for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
		struct qt2160_led *led = &qt2160->leds[i];

		snprintf(led->name, sizeof(led->name), "qt2160:x%d", i);
		led->cdev.name = led->name;
		led->cdev.brightness_set_blocking = qt2160_led_set;
		led->cdev.brightness = LED_OFF;
		led->id = i;
		led->qt2160 = qt2160;

		ret = led_classdev_register(&client->dev, &led->cdev);
		if (ret < 0)
			return ret;
	}

	/* Tur off LEDs */
	qt2160_write(client, QT2160_CMD_DRIVE_X, 0);
	qt2160_write(client, QT2160_CMD_PWMEN_X, 0);
	qt2160_write(client, QT2160_CMD_PWM_DUTY, 0);

	return 0;
}

static void qt2160_unregister_leds(struct qt2160_data *qt2160)
{
	int i;

	for (i = 0; i < QT2160_NUM_LEDS_X; i++)
		led_classdev_unregister(&qt2160->leds[i].cdev);
}

#else

static inline int qt2160_register_leds(struct qt2160_data *qt2160)
{
	return 0;
}

static inline void qt2160_unregister_leds(struct qt2160_data *qt2160)
{
}

#endif

static bool qt2160_identify(struct i2c_client *client)
{
	int id, ver, rev;

	/* Read Chid ID to check if chip is valid */
	id = qt2160_read(client, QT2160_CMD_CHIPID);
	if (id != QT2160_VALID_CHIPID) {
		dev_err(&client->dev, "ID %d not supported\n", id);
		return false;
	}

	/* Read chip firmware version */
	ver = qt2160_read(client, QT2160_CMD_CODEVER);
	if (ver < 0) {
		dev_err(&client->dev, "could not get firmware version\n");
		return false;
	}

	/* Read chip firmware revision */
	rev = qt2160_read(client, QT2160_CMD_SUBVER);
	if (rev < 0) {
		dev_err(&client->dev, "could not get firmware revision\n");
		return false;
	}

	dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
			ver >> 4, ver & 0xf, rev);

	return true;
}

static int qt2160_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct qt2160_data *qt2160;
	struct input_dev *input;
	int i;
	int error;

	/* Check functionality */
	error = i2c_check_functionality(client->adapter,
			I2C_FUNC_SMBUS_BYTE);
	if (!error) {
		dev_err(&client->dev, "%s adapter not supported\n",
				dev_driver_string(&client->adapter->dev));
		return -ENODEV;
	}

	if (!qt2160_identify(client))
		return -ENODEV;

	/* Chip is valid and active. Allocate structure */
	qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
	input = input_allocate_device();
	if (!qt2160 || !input) {
		dev_err(&client->dev, "insufficient memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	qt2160->client = client;
	qt2160->input = input;
	INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);

	input->name = "AT42QT2160 Touch Sense Keyboard";
	input->id.bustype = BUS_I2C;

	input->keycode = qt2160->keycodes;
	input->keycodesize = sizeof(qt2160->keycodes[0]);
	input->keycodemax = ARRAY_SIZE(qt2160_key2code);

	__set_bit(EV_KEY, input->evbit);
	__clear_bit(EV_REP, input->evbit);
	for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) {
		qt2160->keycodes[i] = qt2160_key2code[i];
		__set_bit(qt2160_key2code[i], input->keybit);
	}
	__clear_bit(KEY_RESERVED, input->keybit);

	/* Calibrate device */
	error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
	if (error) {
		dev_err(&client->dev, "failed to calibrate device\n");
		goto err_free_mem;
	}

	if (client->irq) {
		error = request_irq(client->irq, qt2160_irq,
				    IRQF_TRIGGER_FALLING, "qt2160", qt2160);
		if (error) {
			dev_err(&client->dev,
				"failed to allocate irq %d\n", client->irq);
			goto err_free_mem;
		}
	}

	error = qt2160_register_leds(qt2160);
	if (error) {
		dev_err(&client->dev, "Failed to register leds\n");
		goto err_free_irq;
	}

	error = input_register_device(qt2160->input);
	if (error) {
		dev_err(&client->dev,
			"Failed to register input device\n");
		goto err_unregister_leds;
	}

	i2c_set_clientdata(client, qt2160);
	qt2160_schedule_read(qt2160);

	return 0;

err_unregister_leds:
	qt2160_unregister_leds(qt2160);
err_free_irq:
	if (client->irq)
		free_irq(client->irq, qt2160);
err_free_mem:
	input_free_device(input);
	kfree(qt2160);
	return error;
}

static int qt2160_remove(struct i2c_client *client)
{
	struct qt2160_data *qt2160 = i2c_get_clientdata(client);

	qt2160_unregister_leds(qt2160);

	/* Release IRQ so no queue will be scheduled */
	if (client->irq)
		free_irq(client->irq, qt2160);

	cancel_delayed_work_sync(&qt2160->dwork);

	input_unregister_device(qt2160->input);
	kfree(qt2160);

	return 0;
}

static const struct i2c_device_id qt2160_idtable[] = {
	{ "qt2160", 0, },
	{ }
};

MODULE_DEVICE_TABLE(i2c, qt2160_idtable);

static struct i2c_driver qt2160_driver = {
	.driver = {
		.name	= "qt2160",
	},

	.id_table	= qt2160_idtable,
	.probe		= qt2160_probe,
	.remove		= qt2160_remove,
};

module_i2c_driver(qt2160_driver);

MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@gmail.com>");
MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
fde11323 RDP	2	/*
	3	* qt2160.c - Atmel AT42QT2160 Touch Sense Controller
	4	*
	5	* Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
fde11323 RDP	6	*/
	7
	8	#include <linux/kernel.h>
0e47e3dc	9	#include <linux/leds.h>
fde11323 RDP	10	#include <linux/module.h>
	11	#include <linux/slab.h>
	12	#include <linux/jiffies.h>
	13	#include <linux/i2c.h>
	14	#include <linux/irq.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/input.h>
	17
	18	#define QT2160_VALID_CHIPID 0x11
	19
	20	#define QT2160_CMD_CHIPID 0
	21	#define QT2160_CMD_CODEVER 1
	22	#define QT2160_CMD_GSTAT 2
	23	#define QT2160_CMD_KEYS3 3
	24	#define QT2160_CMD_KEYS4 4
	25	#define QT2160_CMD_SLIDE 5
	26	#define QT2160_CMD_GPIOS 6
	27	#define QT2160_CMD_SUBVER 7
	28	#define QT2160_CMD_CALIBRATE 10
0e47e3dc JM	29	#define QT2160_CMD_DRIVE_X 70
	30	#define QT2160_CMD_PWMEN_X 74
	31	#define QT2160_CMD_PWM_DUTY 76
	32
	33	#define QT2160_NUM_LEDS_X 8
fde11323 RDP	34
	35	#define QT2160_CYCLE_INTERVAL (2*HZ)
	36
	37	static unsigned char qt2160_key2code[] = {
	38	KEY_0, KEY_1, KEY_2, KEY_3,
	39	KEY_4, KEY_5, KEY_6, KEY_7,
	40	KEY_8, KEY_9, KEY_A, KEY_B,
	41	KEY_C, KEY_D, KEY_E, KEY_F,
	42	};
	43
0e47e3dc JM	44	#ifdef CONFIG_LEDS_CLASS
	45	struct qt2160_led {
	46	struct qt2160_data *qt2160;
	47	struct led_classdev cdev;
0e47e3dc JM	48	char name[32];
0e47e3dc JM	49	int id;
83cd2030	50	enum led_brightness brightness;
0e47e3dc JM	51	};
	52	#endif
	53
fde11323 RDP	54	struct qt2160_data {
	55	struct i2c_client *client;
	56	struct input_dev *input;
	57	struct delayed_work dwork;
fde11323 RDP	58	unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
fde11323 RDP	59	u16 key_matrix;
0e47e3dc JM	60	#ifdef CONFIG_LEDS_CLASS
0e47e3dc JM	61	struct qt2160_led leds[QT2160_NUM_LEDS_X];
0e47e3dc	62	#endif
fde11323 RDP	63	};
fde11323 RDP	64
0e47e3dc JM	65	static int qt2160_read(struct i2c_client *client, u8 reg);
	66	static int qt2160_write(struct i2c_client *client, u8 reg, u8 data);
	67
	68	#ifdef CONFIG_LEDS_CLASS
	69
83cd2030 DT	70	static int qt2160_led_set(struct led_classdev *cdev,
83cd2030 DT	71	enum led_brightness value)
0e47e3dc	72	{
83cd2030	73	struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev);
0e47e3dc JM	74	struct qt2160_data *qt2160 = led->qt2160;
0e47e3dc JM	75	struct i2c_client *client = qt2160->client;
0e47e3dc JM	76	u32 drive, pwmen;
0e47e3dc JM	77
83cd2030 DT	78	if (value != led->brightness) {
	79	drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
	80	pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
	81	if (value != LED_OFF) {
	82	drive \|= BIT(led->id);
	83	pwmen \|= BIT(led->id);
0e47e3dc	84
83cd2030 DT	85	} else {
	86	drive &= ~BIT(led->id);
	87	pwmen &= ~BIT(led->id);
	88	}
	89	qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
	90	qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);
0e47e3dc	91
83cd2030 DT	92	/*
	93	* Changing this register will change the brightness
	94	* of every LED in the qt2160. It's a HW limitation.
	95	*/
	96	if (value != LED_OFF)
	97	qt2160_write(client, QT2160_CMD_PWM_DUTY, value);
0e47e3dc	98
83cd2030 DT	99	led->brightness = value;
83cd2030 DT	100	}
0e47e3dc	101
83cd2030	102	return 0;
0e47e3dc JM	103	}
	104
	105	#endif /* CONFIG_LEDS_CLASS */
	106
fde11323 RDP	107	static int qt2160_read_block(struct i2c_client *client,
	108	u8 inireg, u8 *buffer, unsigned int count)
	109	{
	110	int error, idx = 0;
	111
	112	/*
	113	* Can't use SMBus block data read. Check for I2C functionality to speed
	114	* things up whenever possible. Otherwise we will be forced to read
	115	* sequentially.
	116	*/
	117	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	118
	119	error = i2c_smbus_write_byte(client, inireg + idx);
	120	if (error) {
	121	dev_err(&client->dev,
	122	"couldn't send request. Returned %d\n", error);
	123	return error;
	124	}
	125
	126	error = i2c_master_recv(client, buffer, count);
	127	if (error != count) {
	128	dev_err(&client->dev,
	129	"couldn't read registers. Returned %d bytes\n", error);
	130	return error;
	131	}
	132	} else {
	133
	134	while (count--) {
	135	int data;
	136
	137	error = i2c_smbus_write_byte(client, inireg + idx);
	138	if (error) {
	139	dev_err(&client->dev,
	140	"couldn't send request. Returned %d\n", error);
	141	return error;
	142	}
	143
	144	data = i2c_smbus_read_byte(client);
	145	if (data < 0) {
	146	dev_err(&client->dev,
	147	"couldn't read register. Returned %d\n", data);
	148	return data;
	149	}
	150
	151	buffer[idx++] = data;
	152	}
	153	}
	154
	155	return 0;
	156	}
	157
	158	static int qt2160_get_key_matrix(struct qt2160_data *qt2160)
	159	{
	160	struct i2c_client *client = qt2160->client;
	161	struct input_dev *input = qt2160->input;
	162	u8 regs[6];
	163	u16 old_matrix, new_matrix;
	164	int ret, i, mask;
	165
	166	dev_dbg(&client->dev, "requesting keys...\n");
	167
	168	/*
	169	* Read all registers from General Status Register
	170	* to GPIOs register
171	*/
172	ret = qt2160_read_block(client, QT2160_CMD_GSTAT, regs, 6);
173	if (ret) {
174	dev_err(&client->dev,
175	"could not perform chip read.\n");
176	return ret;
177	}
178
179	old_matrix = qt2160->key_matrix;
180	qt2160->key_matrix = new_matrix = (regs[2] << 8) \| regs[1];
181
182	mask = 0x01;
183	for (i = 0; i < 16; ++i, mask <<= 1) {
184	int keyval = new_matrix & mask;
185
186	if ((old_matrix & mask) != keyval) {
187	input_report_key(input, qt2160->keycodes[i], keyval);
188	dev_dbg(&client->dev, "key %d %s\n",
189	i, keyval ? "pressed" : "released");
190	}
191	}
192
193	input_sync(input);
194
195	return 0;
196	}
197
198	static irqreturn_t qt2160_irq(int irq, void *_qt2160)
199	{
200	struct qt2160_data *qt2160 = _qt2160;
fde11323	201
e7c2f967	202	mod_delayed_work(system_wq, &qt2160->dwork, 0);
fde11323	203
fde11323 RDP	204	return IRQ_HANDLED;
	205	}
	206
	207	static void qt2160_schedule_read(struct qt2160_data *qt2160)
	208	{
fde11323	209	schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
fde11323 RDP	210	}
	211
	212	static void qt2160_worker(struct work_struct *work)
	213	{
	214	struct qt2160_data *qt2160 =
	215	container_of(work, struct qt2160_data, dwork.work);
	216
	217	dev_dbg(&qt2160->client->dev, "worker\n");
	218
	219	qt2160_get_key_matrix(qt2160);
	220
	221	/* Avoid device lock up by checking every so often */
	222	qt2160_schedule_read(qt2160);
	223	}
	224
5298cc4c	225	static int qt2160_read(struct i2c_client *client, u8 reg)
fde11323 RDP	226	{
	227	int ret;
	228
	229	ret = i2c_smbus_write_byte(client, reg);
	230	if (ret) {
	231	dev_err(&client->dev,
	232	"couldn't send request. Returned %d\n", ret);
	233	return ret;
	234	}
	235
	236	ret = i2c_smbus_read_byte(client);
	237	if (ret < 0) {
	238	dev_err(&client->dev,
	239	"couldn't read register. Returned %d\n", ret);
	240	return ret;
	241	}
	242
	243	return ret;
	244	}
	245
5298cc4c	246	static int qt2160_write(struct i2c_client *client, u8 reg, u8 data)
fde11323	247	{
a6e8c0a2	248	int ret;
fde11323	249
a6e8c0a2 JM	250	ret = i2c_smbus_write_byte_data(client, reg, data);
a6e8c0a2 JM	251	if (ret < 0)
fde11323	252	dev_err(&client->dev,
a6e8c0a2	253	"couldn't write data. Returned %d\n", ret);
fde11323	254
a6e8c0a2	255	return ret;
fde11323 RDP	256	}
fde11323 RDP	257
0e47e3dc JM	258	#ifdef CONFIG_LEDS_CLASS
	259
	260	static int qt2160_register_leds(struct qt2160_data *qt2160)
	261	{
	262	struct i2c_client *client = qt2160->client;
	263	int ret;
	264	int i;
	265
0e47e3dc JM	266	for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
	267	struct qt2160_led *led = &qt2160->leds[i];
	268
	269	snprintf(led->name, sizeof(led->name), "qt2160:x%d", i);
	270	led->cdev.name = led->name;
83cd2030	271	led->cdev.brightness_set_blocking = qt2160_led_set;
0e47e3dc JM	272	led->cdev.brightness = LED_OFF;
	273	led->id = i;
	274	led->qt2160 = qt2160;
	275
0e47e3dc JM	276	ret = led_classdev_register(&client->dev, &led->cdev);
	277	if (ret < 0)
	278	return ret;
	279	}
	280
	281	/* Tur off LEDs */
	282	qt2160_write(client, QT2160_CMD_DRIVE_X, 0);
	283	qt2160_write(client, QT2160_CMD_PWMEN_X, 0);
	284	qt2160_write(client, QT2160_CMD_PWM_DUTY, 0);
	285
	286	return 0;
	287	}
	288
	289	static void qt2160_unregister_leds(struct qt2160_data *qt2160)
	290	{
	291	int i;
	292
83cd2030	293	for (i = 0; i < QT2160_NUM_LEDS_X; i++)
0e47e3dc	294	led_classdev_unregister(&qt2160->leds[i].cdev);
0e47e3dc JM	295	}
	296
	297	#else
	298
	299	static inline int qt2160_register_leds(struct qt2160_data *qt2160)
	300	{
	301	return 0;
	302	}
	303
	304	static inline void qt2160_unregister_leds(struct qt2160_data *qt2160)
	305	{
	306	}
	307
	308	#endif
fde11323	309
5298cc4c	310	static bool qt2160_identify(struct i2c_client *client)
fde11323 RDP	311	{
	312	int id, ver, rev;
	313
	314	/* Read Chid ID to check if chip is valid */
	315	id = qt2160_read(client, QT2160_CMD_CHIPID);
	316	if (id != QT2160_VALID_CHIPID) {
	317	dev_err(&client->dev, "ID %d not supported\n", id);
	318	return false;
	319	}
	320
	321	/* Read chip firmware version */
	322	ver = qt2160_read(client, QT2160_CMD_CODEVER);
	323	if (ver < 0) {
	324	dev_err(&client->dev, "could not get firmware version\n");
	325	return false;
	326	}
	327
	328	/* Read chip firmware revision */
	329	rev = qt2160_read(client, QT2160_CMD_SUBVER);
	330	if (rev < 0) {
	331	dev_err(&client->dev, "could not get firmware revision\n");
	332	return false;
	333	}
	334
	335	dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
	336	ver >> 4, ver & 0xf, rev);
	337
	338	return true;
	339	}
	340
5298cc4c	341	static int qt2160_probe(struct i2c_client *client,
0e47e3dc	342	const struct i2c_device_id *id)
fde11323 RDP	343	{
	344	struct qt2160_data *qt2160;
	345	struct input_dev *input;
	346	int i;
	347	int error;
	348
	349	/* Check functionality */
	350	error = i2c_check_functionality(client->adapter,
	351	I2C_FUNC_SMBUS_BYTE);
	352	if (!error) {
	353	dev_err(&client->dev, "%s adapter not supported\n",
	354	dev_driver_string(&client->adapter->dev));
	355	return -ENODEV;
	356	}
	357
	358	if (!qt2160_identify(client))
	359	return -ENODEV;
	360
	361	/* Chip is valid and active. Allocate structure */
	362	qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
	363	input = input_allocate_device();
	364	if (!qt2160 \|\| !input) {
	365	dev_err(&client->dev, "insufficient memory\n");
	366	error = -ENOMEM;
	367	goto err_free_mem;
	368	}
	369
	370	qt2160->client = client;
	371	qt2160->input = input;
	372	INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);
fde11323 RDP	373
	374	input->name = "AT42QT2160 Touch Sense Keyboard";
	375	input->id.bustype = BUS_I2C;
	376
	377	input->keycode = qt2160->keycodes;
	378	input->keycodesize = sizeof(qt2160->keycodes[0]);
	379	input->keycodemax = ARRAY_SIZE(qt2160_key2code);
	380
	381	__set_bit(EV_KEY, input->evbit);
	382	__clear_bit(EV_REP, input->evbit);
	383	for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) {
	384	qt2160->keycodes[i] = qt2160_key2code[i];
	385	__set_bit(qt2160_key2code[i], input->keybit);
	386	}
	387	__clear_bit(KEY_RESERVED, input->keybit);
	388
	389	/* Calibrate device */
	390	error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
	391	if (error) {
	392	dev_err(&client->dev, "failed to calibrate device\n");
	393	goto err_free_mem;
	394	}
	395
	396	if (client->irq) {
	397	error = request_irq(client->irq, qt2160_irq,
	398	IRQF_TRIGGER_FALLING, "qt2160", qt2160);
	399	if (error) {
	400	dev_err(&client->dev,
	401	"failed to allocate irq %d\n", client->irq);
	402	goto err_free_mem;
	403	}
	404	}
	405
0e47e3dc JM	406	error = qt2160_register_leds(qt2160);
	407	if (error) {
	408	dev_err(&client->dev, "Failed to register leds\n");
	409	goto err_free_irq;
	410	}
	411
fde11323 RDP	412	error = input_register_device(qt2160->input);
	413	if (error) {
	414	dev_err(&client->dev,
	415	"Failed to register input device\n");
0e47e3dc	416	goto err_unregister_leds;
fde11323 RDP	417	}
	418
	419	i2c_set_clientdata(client, qt2160);
	420	qt2160_schedule_read(qt2160);
	421
	422	return 0;
	423
0e47e3dc JM	424	err_unregister_leds:
0e47e3dc JM	425	qt2160_unregister_leds(qt2160);
fde11323 RDP	426	err_free_irq:
	427	if (client->irq)
	428	free_irq(client->irq, qt2160);
	429	err_free_mem:
	430	input_free_device(input);
	431	kfree(qt2160);
	432	return error;
	433	}
	434
e2619cf7	435	static int qt2160_remove(struct i2c_client *client)
fde11323 RDP	436	{
	437	struct qt2160_data *qt2160 = i2c_get_clientdata(client);
	438
0e47e3dc JM	439	qt2160_unregister_leds(qt2160);
0e47e3dc JM	440
fde11323 RDP	441	/* Release IRQ so no queue will be scheduled */
	442	if (client->irq)
	443	free_irq(client->irq, qt2160);
	444
	445	cancel_delayed_work_sync(&qt2160->dwork);
	446
	447	input_unregister_device(qt2160->input);
	448	kfree(qt2160);
	449
fde11323 RDP	450	return 0;
	451	}
	452
ce7b39a1	453	static const struct i2c_device_id qt2160_idtable[] = {
fde11323 RDP	454	{ "qt2160", 0, },
	455	{ }
	456	};
	457
	458	MODULE_DEVICE_TABLE(i2c, qt2160_idtable);
	459
	460	static struct i2c_driver qt2160_driver = {
	461	.driver = {
	462	.name = "qt2160",
fde11323 RDP	463	},
	464
	465	.id_table = qt2160_idtable,
	466	.probe = qt2160_probe,
1cb0aa88	467	.remove = qt2160_remove,
fde11323 RDP	468	};
fde11323 RDP	469
1b92c1cf	470	module_i2c_driver(qt2160_driver);
fde11323 RDP	471
	472	MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@gmail.com>");
	473	MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
	474	MODULE_LICENSE("GPL");