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

/*
 *  qt2160.c - Atmel AT42QT2160 Touch Sense Controller
 *
 *  Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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 program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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;
	struct work_struct work;
	char name[32];
	int id;
	enum led_brightness new_brightness;
};
#endif

struct qt2160_data {
	struct i2c_client *client;
	struct input_dev *input;
	struct delayed_work dwork;
	spinlock_t lock;        /* Protects canceling/rescheduling of dwork */
	unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
	u16 key_matrix;
#ifdef CONFIG_LEDS_CLASS
	struct qt2160_led leds[QT2160_NUM_LEDS_X];
	struct mutex led_lock;
#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 void qt2160_led_work(struct work_struct *work)
{
	struct qt2160_led *led = container_of(work, struct qt2160_led, work);
	struct qt2160_data *qt2160 = led->qt2160;
	struct i2c_client *client = qt2160->client;
	int value = led->new_brightness;
	u32 drive, pwmen;

	mutex_lock(&qt2160->led_lock);

	drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
	pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
	if (value != LED_OFF) {
		drive |= (1 << led->id);
		pwmen |= (1 << led->id);

	} else {
		drive &= ~(1 << led->id);
		pwmen &= ~(1 << 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);

	mutex_unlock(&qt2160->led_lock);
}

static void qt2160_led_set(struct led_classdev *cdev,
			   enum led_brightness value)
{
	struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev);

	led->new_brightness = value;
	schedule_work(&led->work);
}

#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;
	unsigned long flags;

	spin_lock_irqsave(&qt2160->lock, flags);

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

	spin_unlock_irqrestore(&qt2160->lock, flags);

	return IRQ_HANDLED;
}

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

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;

	mutex_init(&qt2160->led_lock);

	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 = qt2160_led_set;
		led->cdev.brightness = LED_OFF;
		led->id = i;
		led->qt2160 = qt2160;

		INIT_WORK(&led->work, qt2160_led_work);

		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);
		cancel_work_sync(&qt2160->leds[i].work);
	}
}

#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);
	spin_lock_init(&qt2160->lock);

	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
fde11323 RDP	1	/*
	2	* qt2160.c - Atmel AT42QT2160 Touch Sense Controller
	3	*
	4	* Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21	#include <linux/kernel.h>
0e47e3dc	22	#include <linux/leds.h>
fde11323 RDP	23	#include <linux/module.h>
	24	#include <linux/slab.h>
	25	#include <linux/jiffies.h>
	26	#include <linux/i2c.h>
	27	#include <linux/irq.h>
	28	#include <linux/interrupt.h>
	29	#include <linux/input.h>
	30
	31	#define QT2160_VALID_CHIPID 0x11
	32
	33	#define QT2160_CMD_CHIPID 0
	34	#define QT2160_CMD_CODEVER 1
	35	#define QT2160_CMD_GSTAT 2
	36	#define QT2160_CMD_KEYS3 3
	37	#define QT2160_CMD_KEYS4 4
	38	#define QT2160_CMD_SLIDE 5
	39	#define QT2160_CMD_GPIOS 6
	40	#define QT2160_CMD_SUBVER 7
	41	#define QT2160_CMD_CALIBRATE 10
0e47e3dc JM	42	#define QT2160_CMD_DRIVE_X 70
	43	#define QT2160_CMD_PWMEN_X 74
	44	#define QT2160_CMD_PWM_DUTY 76
	45
	46	#define QT2160_NUM_LEDS_X 8
fde11323 RDP	47
	48	#define QT2160_CYCLE_INTERVAL (2*HZ)
	49
	50	static unsigned char qt2160_key2code[] = {
	51	KEY_0, KEY_1, KEY_2, KEY_3,
	52	KEY_4, KEY_5, KEY_6, KEY_7,
	53	KEY_8, KEY_9, KEY_A, KEY_B,
	54	KEY_C, KEY_D, KEY_E, KEY_F,
	55	};
	56
0e47e3dc JM	57	#ifdef CONFIG_LEDS_CLASS
	58	struct qt2160_led {
	59	struct qt2160_data *qt2160;
	60	struct led_classdev cdev;
	61	struct work_struct work;
	62	char name[32];
	63	int id;
	64	enum led_brightness new_brightness;
	65	};
	66	#endif
	67
fde11323 RDP	68	struct qt2160_data {
	69	struct i2c_client *client;
	70	struct input_dev *input;
	71	struct delayed_work dwork;
	72	spinlock_t lock; /* Protects canceling/rescheduling of dwork */
	73	unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
	74	u16 key_matrix;
0e47e3dc JM	75	#ifdef CONFIG_LEDS_CLASS
	76	struct qt2160_led leds[QT2160_NUM_LEDS_X];
	77	struct mutex led_lock;
	78	#endif
fde11323 RDP	79	};
fde11323 RDP	80
0e47e3dc JM	81	static int qt2160_read(struct i2c_client *client, u8 reg);
	82	static int qt2160_write(struct i2c_client *client, u8 reg, u8 data);
	83
	84	#ifdef CONFIG_LEDS_CLASS
	85
	86	static void qt2160_led_work(struct work_struct *work)
	87	{
	88	struct qt2160_led *led = container_of(work, struct qt2160_led, work);
	89	struct qt2160_data *qt2160 = led->qt2160;
	90	struct i2c_client *client = qt2160->client;
	91	int value = led->new_brightness;
	92	u32 drive, pwmen;
	93
	94	mutex_lock(&qt2160->led_lock);
	95
	96	drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
	97	pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
	98	if (value != LED_OFF) {
	99	drive \|= (1 << led->id);
	100	pwmen \|= (1 << led->id);
	101
	102	} else {
	103	drive &= ~(1 << led->id);
	104	pwmen &= ~(1 << led->id);
	105	}
	106	qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
	107	qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);
	108
	109	/*
	110	* Changing this register will change the brightness
	111	* of every LED in the qt2160. It's a HW limitation.
	112	*/
	113	if (value != LED_OFF)
	114	qt2160_write(client, QT2160_CMD_PWM_DUTY, value);
	115
	116	mutex_unlock(&qt2160->led_lock);
	117	}
	118
	119	static void qt2160_led_set(struct led_classdev *cdev,
	120	enum led_brightness value)
	121	{
	122	struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev);
	123
	124	led->new_brightness = value;
	125	schedule_work(&led->work);
	126	}
	127
	128	#endif /* CONFIG_LEDS_CLASS */
	129
fde11323 RDP	130	static int qt2160_read_block(struct i2c_client *client,
	131	u8 inireg, u8 *buffer, unsigned int count)
	132	{
	133	int error, idx = 0;
	134
	135	/*
	136	* Can't use SMBus block data read. Check for I2C functionality to speed
	137	* things up whenever possible. Otherwise we will be forced to read
	138	* sequentially.
	139	*/
	140	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	141
	142	error = i2c_smbus_write_byte(client, inireg + idx);
	143	if (error) {
	144	dev_err(&client->dev,
	145	"couldn't send request. Returned %d\n", error);
	146	return error;
	147	}
	148
	149	error = i2c_master_recv(client, buffer, count);
	150	if (error != count) {
	151	dev_err(&client->dev,
	152	"couldn't read registers. Returned %d bytes\n", error);
	153	return error;
	154	}
	155	} else {
	156
	157	while (count--) {
	158	int data;
	159
	160	error = i2c_smbus_write_byte(client, inireg + idx);
	161	if (error) {
	162	dev_err(&client->dev,
	163	"couldn't send request. Returned %d\n", error);
	164	return error;
	165	}
	166
	167	data = i2c_smbus_read_byte(client);
	168	if (data < 0) {
	169	dev_err(&client->dev,
	170	"couldn't read register. Returned %d\n", data);
	171	return data;
	172	}
	173
	174	buffer[idx++] = data;
	175	}
	176	}
	177
	178	return 0;
	179	}
	180
	181	static int qt2160_get_key_matrix(struct qt2160_data *qt2160)
	182	{
	183	struct i2c_client *client = qt2160->client;
	184	struct input_dev *input = qt2160->input;
	185	u8 regs[6];
	186	u16 old_matrix, new_matrix;
	187	int ret, i, mask;
	188
	189	dev_dbg(&client->dev, "requesting keys...\n");
	190
	191	/*
	192	* Read all registers from General Status Register
	193	* to GPIOs register
194	*/
195	ret = qt2160_read_block(client, QT2160_CMD_GSTAT, regs, 6);
196	if (ret) {
197	dev_err(&client->dev,
198	"could not perform chip read.\n");
199	return ret;
200	}
201
202	old_matrix = qt2160->key_matrix;
203	qt2160->key_matrix = new_matrix = (regs[2] << 8) \| regs[1];
204
205	mask = 0x01;
206	for (i = 0; i < 16; ++i, mask <<= 1) {
207	int keyval = new_matrix & mask;
208
209	if ((old_matrix & mask) != keyval) {
210	input_report_key(input, qt2160->keycodes[i], keyval);
211	dev_dbg(&client->dev, "key %d %s\n",
212	i, keyval ? "pressed" : "released");
213	}
214	}
215
216	input_sync(input);
217
218	return 0;
219	}
220
221	static irqreturn_t qt2160_irq(int irq, void *_qt2160)
222	{
223	struct qt2160_data *qt2160 = _qt2160;
224	unsigned long flags;
225
226	spin_lock_irqsave(&qt2160->lock, flags);
227
e7c2f967	228	mod_delayed_work(system_wq, &qt2160->dwork, 0);
fde11323 RDP	229
	230	spin_unlock_irqrestore(&qt2160->lock, flags);
	231
	232	return IRQ_HANDLED;
	233	}
	234
	235	static void qt2160_schedule_read(struct qt2160_data *qt2160)
	236	{
	237	spin_lock_irq(&qt2160->lock);
	238	schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
	239	spin_unlock_irq(&qt2160->lock);
	240	}
	241
	242	static void qt2160_worker(struct work_struct *work)
	243	{
	244	struct qt2160_data *qt2160 =
	245	container_of(work, struct qt2160_data, dwork.work);
	246
	247	dev_dbg(&qt2160->client->dev, "worker\n");
	248
	249	qt2160_get_key_matrix(qt2160);
	250
	251	/* Avoid device lock up by checking every so often */
	252	qt2160_schedule_read(qt2160);
	253	}
	254
5298cc4c	255	static int qt2160_read(struct i2c_client *client, u8 reg)
fde11323 RDP	256	{
	257	int ret;
	258
	259	ret = i2c_smbus_write_byte(client, reg);
	260	if (ret) {
	261	dev_err(&client->dev,
	262	"couldn't send request. Returned %d\n", ret);
	263	return ret;
	264	}
	265
	266	ret = i2c_smbus_read_byte(client);
	267	if (ret < 0) {
	268	dev_err(&client->dev,
	269	"couldn't read register. Returned %d\n", ret);
	270	return ret;
	271	}
	272
	273	return ret;
	274	}
	275
5298cc4c	276	static int qt2160_write(struct i2c_client *client, u8 reg, u8 data)
fde11323	277	{
a6e8c0a2	278	int ret;
fde11323	279
a6e8c0a2 JM	280	ret = i2c_smbus_write_byte_data(client, reg, data);
a6e8c0a2 JM	281	if (ret < 0)
fde11323	282	dev_err(&client->dev,
a6e8c0a2	283	"couldn't write data. Returned %d\n", ret);
fde11323	284
a6e8c0a2	285	return ret;
fde11323 RDP	286	}
fde11323 RDP	287
0e47e3dc JM	288	#ifdef CONFIG_LEDS_CLASS
	289
	290	static int qt2160_register_leds(struct qt2160_data *qt2160)
	291	{
	292	struct i2c_client *client = qt2160->client;
	293	int ret;
	294	int i;
	295
	296	mutex_init(&qt2160->led_lock);
	297
	298	for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
	299	struct qt2160_led *led = &qt2160->leds[i];
	300
	301	snprintf(led->name, sizeof(led->name), "qt2160:x%d", i);
	302	led->cdev.name = led->name;
	303	led->cdev.brightness_set = qt2160_led_set;
	304	led->cdev.brightness = LED_OFF;
	305	led->id = i;
	306	led->qt2160 = qt2160;
	307
	308	INIT_WORK(&led->work, qt2160_led_work);
	309
	310	ret = led_classdev_register(&client->dev, &led->cdev);
	311	if (ret < 0)
	312	return ret;
	313	}
	314
	315	/* Tur off LEDs */
	316	qt2160_write(client, QT2160_CMD_DRIVE_X, 0);
	317	qt2160_write(client, QT2160_CMD_PWMEN_X, 0);
	318	qt2160_write(client, QT2160_CMD_PWM_DUTY, 0);
	319
	320	return 0;
	321	}
	322
	323	static void qt2160_unregister_leds(struct qt2160_data *qt2160)
	324	{
	325	int i;
	326
	327	for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
	328	led_classdev_unregister(&qt2160->leds[i].cdev);
	329	cancel_work_sync(&qt2160->leds[i].work);
	330	}
	331	}
	332
	333	#else
	334
	335	static inline int qt2160_register_leds(struct qt2160_data *qt2160)
	336	{
	337	return 0;
	338	}
	339
	340	static inline void qt2160_unregister_leds(struct qt2160_data *qt2160)
	341	{
	342	}
	343
	344	#endif
fde11323	345
5298cc4c	346	static bool qt2160_identify(struct i2c_client *client)
fde11323 RDP	347	{
	348	int id, ver, rev;
	349
	350	/* Read Chid ID to check if chip is valid */
	351	id = qt2160_read(client, QT2160_CMD_CHIPID);
	352	if (id != QT2160_VALID_CHIPID) {
	353	dev_err(&client->dev, "ID %d not supported\n", id);
	354	return false;
	355	}
	356
	357	/* Read chip firmware version */
	358	ver = qt2160_read(client, QT2160_CMD_CODEVER);
	359	if (ver < 0) {
	360	dev_err(&client->dev, "could not get firmware version\n");
	361	return false;
	362	}
	363
	364	/* Read chip firmware revision */
	365	rev = qt2160_read(client, QT2160_CMD_SUBVER);
	366	if (rev < 0) {
	367	dev_err(&client->dev, "could not get firmware revision\n");
	368	return false;
	369	}
	370
	371	dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
	372	ver >> 4, ver & 0xf, rev);
	373
	374	return true;
	375	}
	376
5298cc4c	377	static int qt2160_probe(struct i2c_client *client,
0e47e3dc	378	const struct i2c_device_id *id)
fde11323 RDP	379	{
	380	struct qt2160_data *qt2160;
	381	struct input_dev *input;
	382	int i;
	383	int error;
	384
	385	/* Check functionality */
	386	error = i2c_check_functionality(client->adapter,
	387	I2C_FUNC_SMBUS_BYTE);
	388	if (!error) {
	389	dev_err(&client->dev, "%s adapter not supported\n",
	390	dev_driver_string(&client->adapter->dev));
	391	return -ENODEV;
	392	}
	393
	394	if (!qt2160_identify(client))
	395	return -ENODEV;
	396
	397	/* Chip is valid and active. Allocate structure */
	398	qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
	399	input = input_allocate_device();
	400	if (!qt2160 \|\| !input) {
	401	dev_err(&client->dev, "insufficient memory\n");
	402	error = -ENOMEM;
	403	goto err_free_mem;
	404	}
	405
	406	qt2160->client = client;
	407	qt2160->input = input;
	408	INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);
	409	spin_lock_init(&qt2160->lock);
	410
	411	input->name = "AT42QT2160 Touch Sense Keyboard";
	412	input->id.bustype = BUS_I2C;
	413
	414	input->keycode = qt2160->keycodes;
	415	input->keycodesize = sizeof(qt2160->keycodes[0]);
	416	input->keycodemax = ARRAY_SIZE(qt2160_key2code);
	417
	418	__set_bit(EV_KEY, input->evbit);
	419	__clear_bit(EV_REP, input->evbit);
	420	for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) {
	421	qt2160->keycodes[i] = qt2160_key2code[i];
	422	__set_bit(qt2160_key2code[i], input->keybit);
	423	}
	424	__clear_bit(KEY_RESERVED, input->keybit);
	425
	426	/* Calibrate device */
	427	error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
	428	if (error) {
	429	dev_err(&client->dev, "failed to calibrate device\n");
	430	goto err_free_mem;
	431	}
	432
	433	if (client->irq) {
	434	error = request_irq(client->irq, qt2160_irq,
	435	IRQF_TRIGGER_FALLING, "qt2160", qt2160);
	436	if (error) {
	437	dev_err(&client->dev,
	438	"failed to allocate irq %d\n", client->irq);
	439	goto err_free_mem;
	440	}
	441	}
	442
0e47e3dc JM	443	error = qt2160_register_leds(qt2160);
	444	if (error) {
	445	dev_err(&client->dev, "Failed to register leds\n");
	446	goto err_free_irq;
	447	}
	448
fde11323 RDP	449	error = input_register_device(qt2160->input);
	450	if (error) {
	451	dev_err(&client->dev,
	452	"Failed to register input device\n");
0e47e3dc	453	goto err_unregister_leds;
fde11323 RDP	454	}
	455
	456	i2c_set_clientdata(client, qt2160);
	457	qt2160_schedule_read(qt2160);
	458
	459	return 0;
	460
0e47e3dc JM	461	err_unregister_leds:
0e47e3dc JM	462	qt2160_unregister_leds(qt2160);
fde11323 RDP	463	err_free_irq:
	464	if (client->irq)
	465	free_irq(client->irq, qt2160);
	466	err_free_mem:
	467	input_free_device(input);
	468	kfree(qt2160);
	469	return error;
	470	}
	471
e2619cf7	472	static int qt2160_remove(struct i2c_client *client)
fde11323 RDP	473	{
	474	struct qt2160_data *qt2160 = i2c_get_clientdata(client);
	475
0e47e3dc JM	476	qt2160_unregister_leds(qt2160);
0e47e3dc JM	477
fde11323 RDP	478	/* Release IRQ so no queue will be scheduled */
	479	if (client->irq)
	480	free_irq(client->irq, qt2160);
	481
	482	cancel_delayed_work_sync(&qt2160->dwork);
	483
	484	input_unregister_device(qt2160->input);
	485	kfree(qt2160);
	486
fde11323 RDP	487	return 0;
	488	}
	489
ce7b39a1	490	static const struct i2c_device_id qt2160_idtable[] = {
fde11323 RDP	491	{ "qt2160", 0, },
	492	{ }
	493	};
	494
	495	MODULE_DEVICE_TABLE(i2c, qt2160_idtable);
	496
	497	static struct i2c_driver qt2160_driver = {
	498	.driver = {
	499	.name = "qt2160",
fde11323 RDP	500	},
	501
	502	.id_table = qt2160_idtable,
	503	.probe = qt2160_probe,
1cb0aa88	504	.remove = qt2160_remove,
fde11323 RDP	505	};
fde11323 RDP	506
1b92c1cf	507	module_i2c_driver(qt2160_driver);
fde11323 RDP	508
	509	MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@gmail.com>");
	510	MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
	511	MODULE_LICENSE("GPL");