[net-next-2.6.git] / drivers / input / keyboard / max7359_keypad.c

/*
 * max7359_keypad.c - MAX7359 Key Switch Controller Driver
 *
 * Copyright (C) 2009 Samsung Electronics
 * Kim Kyuwon <q1.kim@samsung.com>
 *
 * Based on pxa27x_keypad.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5456
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/input/matrix_keypad.h>

#define MAX7359_MAX_KEY_ROWS	8
#define MAX7359_MAX_KEY_COLS	8
#define MAX7359_MAX_KEY_NUM	(MAX7359_MAX_KEY_ROWS * MAX7359_MAX_KEY_COLS)
#define MAX7359_ROW_SHIFT	3

/*
 * MAX7359 registers
 */
#define MAX7359_REG_KEYFIFO	0x00
#define MAX7359_REG_CONFIG	0x01
#define MAX7359_REG_DEBOUNCE	0x02
#define MAX7359_REG_INTERRUPT	0x03
#define MAX7359_REG_PORTS	0x04
#define MAX7359_REG_KEYREP	0x05
#define MAX7359_REG_SLEEP	0x06

/*
 * Configuration register bits
 */
#define MAX7359_CFG_SLEEP	(1 << 7)
#define MAX7359_CFG_INTERRUPT	(1 << 5)
#define MAX7359_CFG_KEY_RELEASE	(1 << 3)
#define MAX7359_CFG_WAKEUP	(1 << 1)
#define MAX7359_CFG_TIMEOUT	(1 << 0)

/*
 * Autosleep register values (ms)
 */
#define MAX7359_AUTOSLEEP_8192	0x01
#define MAX7359_AUTOSLEEP_4096	0x02
#define MAX7359_AUTOSLEEP_2048	0x03
#define MAX7359_AUTOSLEEP_1024	0x04
#define MAX7359_AUTOSLEEP_512	0x05
#define MAX7359_AUTOSLEEP_256	0x06

struct max7359_keypad {
	/* matrix key code map */
	unsigned short keycodes[MAX7359_MAX_KEY_NUM];

	struct input_dev *input_dev;
	struct i2c_client *client;
};

static int max7359_write_reg(struct i2c_client *client, u8 reg, u8 val)
{
	int ret = i2c_smbus_write_byte_data(client, reg, val);

	if (ret < 0)
		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
			__func__, reg, val, ret);
	return ret;
}

static int max7359_read_reg(struct i2c_client *client, int reg)
{
	int ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0)
		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
			__func__, reg, ret);
	return ret;
}

static void max7359_build_keycode(struct max7359_keypad *keypad,
				const struct matrix_keymap_data *keymap_data)
{
	struct input_dev *input_dev = keypad->input_dev;
	int i;

	for (i = 0; i < keymap_data->keymap_size; i++) {
		unsigned int key = keymap_data->keymap[i];
		unsigned int row = KEY_ROW(key);
		unsigned int col = KEY_COL(key);
		unsigned int scancode = MATRIX_SCAN_CODE(row, col,
						MAX7359_ROW_SHIFT);
		unsigned short keycode = KEY_VAL(key);

		keypad->keycodes[scancode] = keycode;
		__set_bit(keycode, input_dev->keybit);
	}
	__clear_bit(KEY_RESERVED, input_dev->keybit);
}

/* runs in an IRQ thread -- can (and will!) sleep */
static irqreturn_t max7359_interrupt(int irq, void *dev_id)
{
	struct max7359_keypad *keypad = dev_id;
	struct input_dev *input_dev = keypad->input_dev;
	int val, row, col, release, code;

	val = max7359_read_reg(keypad->client, MAX7359_REG_KEYFIFO);
	row = val & 0x7;
	col = (val >> 3) & 0x7;
	release = val & 0x40;

	code = MATRIX_SCAN_CODE(row, col, MAX7359_ROW_SHIFT);

	dev_dbg(&keypad->client->dev,
		"key[%d:%d] %s\n", row, col, release ? "release" : "press");

	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	input_report_key(input_dev, keypad->keycodes[code], !release);
	input_sync(input_dev);

	return IRQ_HANDLED;
}

/*
 * Let MAX7359 fall into a deep sleep:
 * If no keys are pressed, enter sleep mode for 8192 ms. And if any
 * key is pressed, the MAX7359 returns to normal operating mode.
 */
static inline void max7359_fall_deepsleep(struct i2c_client *client)
{
	max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_8192);
}

/*
 * Let MAX7359 take a catnap:
 * Autosleep just for 256 ms.
 */
static inline void max7359_take_catnap(struct i2c_client *client)
{
	max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_256);
}

static int max7359_open(struct input_dev *dev)
{
	struct max7359_keypad *keypad = input_get_drvdata(dev);

	max7359_take_catnap(keypad->client);

	return 0;
}

static void max7359_close(struct input_dev *dev)
{
	struct max7359_keypad *keypad = input_get_drvdata(dev);

	max7359_fall_deepsleep(keypad->client);
}

static void max7359_initialize(struct i2c_client *client)
{
	max7359_write_reg(client, MAX7359_REG_CONFIG,
		MAX7359_CFG_INTERRUPT | /* Irq clears after host read */
		MAX7359_CFG_KEY_RELEASE | /* Key release enable */
		MAX7359_CFG_WAKEUP); /* Key press wakeup enable */

	/* Full key-scan functionality */
	max7359_write_reg(client, MAX7359_REG_DEBOUNCE, 0x1F);

	/* nINT asserts every debounce cycles */
	max7359_write_reg(client, MAX7359_REG_INTERRUPT, 0x01);

	max7359_fall_deepsleep(client);
}

static int __devinit max7359_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	const struct matrix_keymap_data *keymap_data = client->dev.platform_data;
	struct max7359_keypad *keypad;
	struct input_dev *input_dev;
	int ret;
	int error;

	if (!client->irq) {
		dev_err(&client->dev, "The irq number should not be zero\n");
		return -EINVAL;
	}

	/* Detect MAX7359: The initial Keys FIFO value is '0x3F' */
	ret = max7359_read_reg(client, MAX7359_REG_KEYFIFO);
	if (ret < 0) {
		dev_err(&client->dev, "failed to detect device\n");
		return -ENODEV;
	}

	dev_dbg(&client->dev, "keys FIFO is 0x%02x\n", ret);

	keypad = kzalloc(sizeof(struct max7359_keypad), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!keypad || !input_dev) {
		dev_err(&client->dev, "failed to allocate memory\n");
		error = -ENOMEM;
		goto failed_free_mem;
	}

	keypad->client = client;
	keypad->input_dev = input_dev;

	input_dev->name = client->name;
	input_dev->id.bustype = BUS_I2C;
	input_dev->open = max7359_open;
	input_dev->close = max7359_close;
	input_dev->dev.parent = &client->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
	input_dev->keycodesize = sizeof(keypad->keycodes[0]);
	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
	input_dev->keycode = keypad->keycodes;

	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	input_set_drvdata(input_dev, keypad);

	max7359_build_keycode(keypad, keymap_data);

	error = request_threaded_irq(client->irq, NULL, max7359_interrupt,
				     IRQF_TRIGGER_LOW | IRQF_ONESHOT,
				     client->name, keypad);
	if (error) {
		dev_err(&client->dev, "failed to register interrupt\n");
		goto failed_free_mem;
	}

	/* Register the input device */
	error = input_register_device(input_dev);
	if (error) {
		dev_err(&client->dev, "failed to register input device\n");
		goto failed_free_irq;
	}

	/* Initialize MAX7359 */
	max7359_initialize(client);

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

	return 0;

failed_free_irq:
	free_irq(client->irq, keypad);
failed_free_mem:
	input_free_device(input_dev);
	kfree(keypad);
	return error;
}

static int __devexit max7359_remove(struct i2c_client *client)
{
	struct max7359_keypad *keypad = i2c_get_clientdata(client);

	free_irq(client->irq, keypad);
	input_unregister_device(keypad->input_dev);
	i2c_set_clientdata(client, NULL);
	kfree(keypad);

	return 0;
}

#ifdef CONFIG_PM
static int max7359_suspend(struct i2c_client *client, pm_message_t mesg)
{
	max7359_fall_deepsleep(client);

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

	return 0;
}

static int max7359_resume(struct i2c_client *client)
{
	if (device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);

	/* Restore the default setting */
	max7359_take_catnap(client);

	return 0;
}
#else
#define max7359_suspend	NULL
#define max7359_resume	NULL
#endif

static const struct i2c_device_id max7359_ids[] = {
	{ "max7359", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max7359_ids);

static struct i2c_driver max7359_i2c_driver = {
	.driver = {
		.name = "max7359",
	},
	.probe		= max7359_probe,
	.remove		= __devexit_p(max7359_remove),
	.suspend	= max7359_suspend,
	.resume		= max7359_resume,
	.id_table	= max7359_ids,
};

static int __init max7359_init(void)
{
	return i2c_add_driver(&max7359_i2c_driver);
}
module_init(max7359_init);

static void __exit max7359_exit(void)
{
	i2c_del_driver(&max7359_i2c_driver);
}
module_exit(max7359_exit);

MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
MODULE_DESCRIPTION("MAX7359 Key Switch Controller Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
0baf81ba KK	1	/*
	2	* max7359_keypad.c - MAX7359 Key Switch Controller Driver
	3	*
	4	* Copyright (C) 2009 Samsung Electronics
	5	* Kim Kyuwon <q1.kim@samsung.com>
	6	*
	7	* Based on pxa27x_keypad.c
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5456
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/i2c.h>
5a0e3ad6	18	#include <linux/slab.h>
0baf81ba KK	19	#include <linux/interrupt.h>
	20	#include <linux/input.h>
	21	#include <linux/input/matrix_keypad.h>
	22
	23	#define MAX7359_MAX_KEY_ROWS 8
	24	#define MAX7359_MAX_KEY_COLS 8
	25	#define MAX7359_MAX_KEY_NUM (MAX7359_MAX_KEY_ROWS * MAX7359_MAX_KEY_COLS)
	26	#define MAX7359_ROW_SHIFT 3
	27
	28	/*
	29	* MAX7359 registers
	30	*/
	31	#define MAX7359_REG_KEYFIFO 0x00
	32	#define MAX7359_REG_CONFIG 0x01
	33	#define MAX7359_REG_DEBOUNCE 0x02
	34	#define MAX7359_REG_INTERRUPT 0x03
	35	#define MAX7359_REG_PORTS 0x04
	36	#define MAX7359_REG_KEYREP 0x05
	37	#define MAX7359_REG_SLEEP 0x06
	38
	39	/*
	40	* Configuration register bits
	41	*/
	42	#define MAX7359_CFG_SLEEP (1 << 7)
	43	#define MAX7359_CFG_INTERRUPT (1 << 5)
	44	#define MAX7359_CFG_KEY_RELEASE (1 << 3)
	45	#define MAX7359_CFG_WAKEUP (1 << 1)
	46	#define MAX7359_CFG_TIMEOUT (1 << 0)
	47
	48	/*
	49	* Autosleep register values (ms)
	50	*/
	51	#define MAX7359_AUTOSLEEP_8192 0x01
	52	#define MAX7359_AUTOSLEEP_4096 0x02
	53	#define MAX7359_AUTOSLEEP_2048 0x03
	54	#define MAX7359_AUTOSLEEP_1024 0x04
	55	#define MAX7359_AUTOSLEEP_512 0x05
	56	#define MAX7359_AUTOSLEEP_256 0x06
	57
	58	struct max7359_keypad {
	59	/* matrix key code map */
	60	unsigned short keycodes[MAX7359_MAX_KEY_NUM];
	61
0baf81ba KK	62	struct input_dev *input_dev;
0baf81ba KK	63	struct i2c_client *client;
0baf81ba KK	64	};
	65
	66	static int max7359_write_reg(struct i2c_client *client, u8 reg, u8 val)
	67	{
	68	int ret = i2c_smbus_write_byte_data(client, reg, val);
	69
	70	if (ret < 0)
	71	dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
	72	__func__, reg, val, ret);
	73	return ret;
	74	}
	75
	76	static int max7359_read_reg(struct i2c_client *client, int reg)
	77	{
	78	int ret = i2c_smbus_read_byte_data(client, reg);
	79
	80	if (ret < 0)
	81	dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
	82	__func__, reg, ret);
	83	return ret;
	84	}
	85
	86	static void max7359_build_keycode(struct max7359_keypad *keypad,
	87	const struct matrix_keymap_data *keymap_data)
	88	{
	89	struct input_dev *input_dev = keypad->input_dev;
	90	int i;
	91
	92	for (i = 0; i < keymap_data->keymap_size; i++) {
	93	unsigned int key = keymap_data->keymap[i];
	94	unsigned int row = KEY_ROW(key);
	95	unsigned int col = KEY_COL(key);
	96	unsigned int scancode = MATRIX_SCAN_CODE(row, col,
	97	MAX7359_ROW_SHIFT);
	98	unsigned short keycode = KEY_VAL(key);
	99
	100	keypad->keycodes[scancode] = keycode;
	101	__set_bit(keycode, input_dev->keybit);
	102	}
	103	__clear_bit(KEY_RESERVED, input_dev->keybit);
	104	}
	105
44ca397b DT	106	/* runs in an IRQ thread -- can (and will!) sleep */
44ca397b DT	107	static irqreturn_t max7359_interrupt(int irq, void *dev_id)
0baf81ba	108	{
44ca397b	109	struct max7359_keypad *keypad = dev_id;
0baf81ba KK	110	struct input_dev *input_dev = keypad->input_dev;
	111	int val, row, col, release, code;
	112
	113	val = max7359_read_reg(keypad->client, MAX7359_REG_KEYFIFO);
	114	row = val & 0x7;
	115	col = (val >> 3) & 0x7;
	116	release = val & 0x40;
	117
	118	code = MATRIX_SCAN_CODE(row, col, MAX7359_ROW_SHIFT);
	119
44ca397b DT	120	dev_dbg(&keypad->client->dev,
	121	"key[%d:%d] %s\n", row, col, release ? "release" : "press");
	122
0baf81ba KK	123	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	124	input_report_key(input_dev, keypad->keycodes[code], !release);
	125	input_sync(input_dev);
	126
0baf81ba KK	127	return IRQ_HANDLED;
	128	}
	129
	130	/*
	131	* Let MAX7359 fall into a deep sleep:
	132	* If no keys are pressed, enter sleep mode for 8192 ms. And if any
	133	* key is pressed, the MAX7359 returns to normal operating mode.
	134	*/
	135	static inline void max7359_fall_deepsleep(struct i2c_client *client)
	136	{
	137	max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_8192);
	138	}
	139
	140	/*
	141	* Let MAX7359 take a catnap:
	142	* Autosleep just for 256 ms.
	143	*/
	144	static inline void max7359_take_catnap(struct i2c_client *client)
	145	{
	146	max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_256);
	147	}
	148
	149	static int max7359_open(struct input_dev *dev)
	150	{
	151	struct max7359_keypad *keypad = input_get_drvdata(dev);
	152
	153	max7359_take_catnap(keypad->client);
	154
	155	return 0;
	156	}
	157
	158	static void max7359_close(struct input_dev *dev)
	159	{
	160	struct max7359_keypad *keypad = input_get_drvdata(dev);
	161
	162	max7359_fall_deepsleep(keypad->client);
	163	}
	164
	165	static void max7359_initialize(struct i2c_client *client)
	166	{
	167	max7359_write_reg(client, MAX7359_REG_CONFIG,
	168	MAX7359_CFG_INTERRUPT \| /* Irq clears after host read */
	169	MAX7359_CFG_KEY_RELEASE \| /* Key release enable */
	170	MAX7359_CFG_WAKEUP); /* Key press wakeup enable */
	171
	172	/* Full key-scan functionality */
	173	max7359_write_reg(client, MAX7359_REG_DEBOUNCE, 0x1F);
	174
	175	/* nINT asserts every debounce cycles */
	176	max7359_write_reg(client, MAX7359_REG_INTERRUPT, 0x01);
	177
	178	max7359_fall_deepsleep(client);
	179	}
	180
	181	static int __devinit max7359_probe(struct i2c_client *client,
	182	const struct i2c_device_id *id)
	183	{
	184	const struct matrix_keymap_data *keymap_data = client->dev.platform_data;
	185	struct max7359_keypad *keypad;
	186	struct input_dev *input_dev;
	187	int ret;
	188	int error;
	189
	190	if (!client->irq) {
191	dev_err(&client->dev, "The irq number should not be zero\n");
192	return -EINVAL;
193	}
194
195	/* Detect MAX7359: The initial Keys FIFO value is '0x3F' */
196	ret = max7359_read_reg(client, MAX7359_REG_KEYFIFO);
197	if (ret < 0) {
198	dev_err(&client->dev, "failed to detect device\n");
199	return -ENODEV;
200	}
201
202	dev_dbg(&client->dev, "keys FIFO is 0x%02x\n", ret);
203
204	keypad = kzalloc(sizeof(struct max7359_keypad), GFP_KERNEL);
205	input_dev = input_allocate_device();
206	if (!keypad \|\| !input_dev) {
207	dev_err(&client->dev, "failed to allocate memory\n");
208	error = -ENOMEM;
209	goto failed_free_mem;
210	}
211
212	keypad->client = client;
213	keypad->input_dev = input_dev;
0baf81ba KK	214
	215	input_dev->name = client->name;
	216	input_dev->id.bustype = BUS_I2C;
	217	input_dev->open = max7359_open;
	218	input_dev->close = max7359_close;
	219	input_dev->dev.parent = &client->dev;
	220
	221	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_REP);
	222	input_dev->keycodesize = sizeof(keypad->keycodes[0]);
	223	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
	224	input_dev->keycode = keypad->keycodes;
	225
	226	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	227	input_set_drvdata(input_dev, keypad);
	228
	229	max7359_build_keycode(keypad, keymap_data);
	230
44ca397b DT	231	error = request_threaded_irq(client->irq, NULL, max7359_interrupt,
	232	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	233	client->name, keypad);
0baf81ba KK	234	if (error) {
	235	dev_err(&client->dev, "failed to register interrupt\n");
	236	goto failed_free_mem;
	237	}
	238
	239	/* Register the input device */
	240	error = input_register_device(input_dev);
	241	if (error) {
	242	dev_err(&client->dev, "failed to register input device\n");
	243	goto failed_free_irq;
	244	}
	245
	246	/* Initialize MAX7359 */
	247	max7359_initialize(client);
	248
	249	i2c_set_clientdata(client, keypad);
	250	device_init_wakeup(&client->dev, 1);
	251
	252	return 0;
	253
	254	failed_free_irq:
44ca397b	255	free_irq(client->irq, keypad);
0baf81ba KK	256	failed_free_mem:
	257	input_free_device(input_dev);
	258	kfree(keypad);
	259	return error;
	260	}
	261
	262	static int __devexit max7359_remove(struct i2c_client *client)
	263	{
	264	struct max7359_keypad *keypad = i2c_get_clientdata(client);
	265
44ca397b	266	free_irq(client->irq, keypad);
0baf81ba	267	input_unregister_device(keypad->input_dev);
0baf81ba KK	268	i2c_set_clientdata(client, NULL);
	269	kfree(keypad);
	270
	271	return 0;
	272	}
	273
	274	#ifdef CONFIG_PM
	275	static int max7359_suspend(struct i2c_client *client, pm_message_t mesg)
	276	{
0baf81ba KK	277	max7359_fall_deepsleep(client);
	278
	279	if (device_may_wakeup(&client->dev))
44ca397b	280	enable_irq_wake(client->irq);
0baf81ba KK	281
	282	return 0;
	283	}
	284
	285	static int max7359_resume(struct i2c_client *client)
	286	{
0baf81ba	287	if (device_may_wakeup(&client->dev))
44ca397b	288	disable_irq_wake(client->irq);
0baf81ba KK	289
	290	/* Restore the default setting */
	291	max7359_take_catnap(client);
	292
	293	return 0;
	294	}
	295	#else
	296	#define max7359_suspend NULL
	297	#define max7359_resume NULL
	298	#endif
	299
	300	static const struct i2c_device_id max7359_ids[] = {
	301	{ "max7359", 0 },
	302	{ }
	303	};
	304	MODULE_DEVICE_TABLE(i2c, max7359_ids);
	305
	306	static struct i2c_driver max7359_i2c_driver = {
	307	.driver = {
	308	.name = "max7359",
	309	},
	310	.probe = max7359_probe,
	311	.remove = __devexit_p(max7359_remove),
	312	.suspend = max7359_suspend,
	313	.resume = max7359_resume,
	314	.id_table = max7359_ids,
	315	};
	316
	317	static int __init max7359_init(void)
	318	{
	319	return i2c_add_driver(&max7359_i2c_driver);
	320	}
	321	module_init(max7359_init);
	322
	323	static void __exit max7359_exit(void)
	324	{
	325	i2c_del_driver(&max7359_i2c_driver);
	326	}
	327	module_exit(max7359_exit);
	328
	329	MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
	330	MODULE_DESCRIPTION("MAX7359 Key Switch Controller Driver");
	331	MODULE_LICENSE("GPL v2");