[linux-2.6-block.git] / drivers / input / keyboard / mcs_touchkey.c

/*
 * Touchkey driver for MELFAS MCS5000/5080 controller
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: HeungJun Kim <riverful.kim@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c/mcs.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/pm.h>

/* MCS5000 Touchkey */
#define MCS5000_TOUCHKEY_STATUS		0x04
#define MCS5000_TOUCHKEY_STATUS_PRESS	7
#define MCS5000_TOUCHKEY_FW		0x0a
#define MCS5000_TOUCHKEY_BASE_VAL	0x61

/* MCS5080 Touchkey */
#define MCS5080_TOUCHKEY_STATUS		0x00
#define MCS5080_TOUCHKEY_STATUS_PRESS	3
#define MCS5080_TOUCHKEY_FW		0x01
#define MCS5080_TOUCHKEY_BASE_VAL	0x1

enum mcs_touchkey_type {
	MCS5000_TOUCHKEY,
	MCS5080_TOUCHKEY,
};

struct mcs_touchkey_chip {
	unsigned int status_reg;
	unsigned int pressbit;
	unsigned int press_invert;
	unsigned int baseval;
};

struct mcs_touchkey_data {
	void (*poweron)(bool);

	struct i2c_client *client;
	struct input_dev *input_dev;
	struct mcs_touchkey_chip chip;
	unsigned int key_code;
	unsigned int key_val;
	unsigned short keycodes[];
};

static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
{
	struct mcs_touchkey_data *data = dev_id;
	struct mcs_touchkey_chip *chip = &data->chip;
	struct i2c_client *client = data->client;
	struct input_dev *input = data->input_dev;
	unsigned int key_val;
	unsigned int pressed;
	int val;

	val = i2c_smbus_read_byte_data(client, chip->status_reg);
	if (val < 0) {
		dev_err(&client->dev, "i2c read error [%d]\n", val);
		goto out;
	}

	pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
	if (chip->press_invert)
		pressed ^= chip->press_invert;

	/* key_val is 0 when released, so we should use key_val of press. */
	if (pressed) {
		key_val = val & (0xff >> (8 - chip->pressbit));
		if (!key_val)
			goto out;
		key_val -= chip->baseval;
		data->key_code = data->keycodes[key_val];
		data->key_val = key_val;
	}

	input_event(input, EV_MSC, MSC_SCAN, data->key_val);
	input_report_key(input, data->key_code, pressed);
	input_sync(input);

	dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
		pressed ? "pressed" : "released");

 out:
	return IRQ_HANDLED;
}

static int __devinit mcs_touchkey_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	const struct mcs_platform_data *pdata;
	struct mcs_touchkey_data *data;
	struct input_dev *input_dev;
	unsigned int fw_reg;
	int fw_ver;
	int error;
	int i;

	pdata = client->dev.platform_data;
	if (!pdata) {
		dev_err(&client->dev, "no platform data defined\n");
		return -EINVAL;
	}

	data = kzalloc(sizeof(struct mcs_touchkey_data) +
			sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
			GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!data || !input_dev) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	data->client = client;
	data->input_dev = input_dev;

	if (id->driver_data == MCS5000_TOUCHKEY) {
		data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
		data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
		data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
		fw_reg = MCS5000_TOUCHKEY_FW;
	} else {
		data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
		data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
		data->chip.press_invert = 1;
		data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
		fw_reg = MCS5080_TOUCHKEY_FW;
	}

	fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
	if (fw_ver < 0) {
		error = fw_ver;
		dev_err(&client->dev, "i2c read error[%d]\n", error);
		goto err_free_mem;
	}
	dev_info(&client->dev, "Firmware version: %d\n", fw_ver);

	input_dev->name = "MELPAS MCS Touchkey";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;
	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	if (!pdata->no_autorepeat)
		input_dev->evbit[0] |= BIT_MASK(EV_REP);
	input_dev->keycode = data->keycodes;
	input_dev->keycodesize = sizeof(data->keycodes[0]);
	input_dev->keycodemax = pdata->key_maxval + 1;

	for (i = 0; i < pdata->keymap_size; i++) {
		unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
		unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);

		data->keycodes[val] = code;
		__set_bit(code, input_dev->keybit);
	}

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

	if (pdata->cfg_pin)
		pdata->cfg_pin();

	if (pdata->poweron) {
		data->poweron = pdata->poweron;
		data->poweron(true);
	}

	error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
			IRQF_TRIGGER_FALLING, client->dev.driver->name, data);
	if (error) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		goto err_free_mem;
	}

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

	i2c_set_clientdata(client, data);
	return 0;

err_free_irq:
	free_irq(client->irq, data);
err_free_mem:
	input_free_device(input_dev);
	kfree(data);
	return error;
}

static int __devexit mcs_touchkey_remove(struct i2c_client *client)
{
	struct mcs_touchkey_data *data = i2c_get_clientdata(client);

	free_irq(client->irq, data);
	if (data->poweron)
		data->poweron(false);
	input_unregister_device(data->input_dev);
	kfree(data);

	return 0;
}

static void mcs_touchkey_shutdown(struct i2c_client *client)
{
	struct mcs_touchkey_data *data = i2c_get_clientdata(client);

	if (data->poweron)
		data->poweron(false);
}

#ifdef CONFIG_PM_SLEEP
static int mcs_touchkey_suspend(struct device *dev)
{
	struct mcs_touchkey_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	/* Disable the work */
	disable_irq(client->irq);

	/* Finally turn off the power */
	if (data->poweron)
		data->poweron(false);

	return 0;
}

static int mcs_touchkey_resume(struct device *dev)
{
	struct mcs_touchkey_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	/* Enable the device first */
	if (data->poweron)
		data->poweron(true);

	/* Enable irq again */
	enable_irq(client->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
			 mcs_touchkey_suspend, mcs_touchkey_resume);

static const struct i2c_device_id mcs_touchkey_id[] = {
	{ "mcs5000_touchkey", MCS5000_TOUCHKEY },
	{ "mcs5080_touchkey", MCS5080_TOUCHKEY },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);

static struct i2c_driver mcs_touchkey_driver = {
	.driver = {
		.name	= "mcs_touchkey",
		.owner	= THIS_MODULE,
		.pm	= &mcs_touchkey_pm_ops,
	},
	.probe		= mcs_touchkey_probe,
	.remove		= __devexit_p(mcs_touchkey_remove),
	.shutdown       = mcs_touchkey_shutdown,
	.id_table	= mcs_touchkey_id,
};

module_i2c_driver(mcs_touchkey_driver);

/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
MODULE_LICENSE("GPL");
Commit	Line	Data
312e8e8a	1	/*
adf779c1	2	* Touchkey driver for MELFAS MCS5000/5080 controller
312e8e8a JS	3	*
	4	* Copyright (C) 2010 Samsung Electronics Co.Ltd
	5	* Author: HeungJun Kim <riverful.kim@samsung.com>
	6	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/i2c.h>
	17	#include <linux/i2c/mcs.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/input.h>
	20	#include <linux/irq.h>
	21	#include <linux/slab.h>
adf779c1	22	#include <linux/pm.h>
312e8e8a JS	23
	24	/* MCS5000 Touchkey */
	25	#define MCS5000_TOUCHKEY_STATUS 0x04
	26	#define MCS5000_TOUCHKEY_STATUS_PRESS 7
	27	#define MCS5000_TOUCHKEY_FW 0x0a
	28	#define MCS5000_TOUCHKEY_BASE_VAL 0x61
	29
	30	/* MCS5080 Touchkey */
	31	#define MCS5080_TOUCHKEY_STATUS 0x00
	32	#define MCS5080_TOUCHKEY_STATUS_PRESS 3
	33	#define MCS5080_TOUCHKEY_FW 0x01
	34	#define MCS5080_TOUCHKEY_BASE_VAL 0x1
	35
	36	enum mcs_touchkey_type {
	37	MCS5000_TOUCHKEY,
	38	MCS5080_TOUCHKEY,
	39	};
	40
	41	struct mcs_touchkey_chip {
	42	unsigned int status_reg;
	43	unsigned int pressbit;
	44	unsigned int press_invert;
	45	unsigned int baseval;
	46	};
	47
	48	struct mcs_touchkey_data {
adf779c1 HK	49	void (*poweron)(bool);
adf779c1 HK	50
312e8e8a JS	51	struct i2c_client *client;
	52	struct input_dev *input_dev;
	53	struct mcs_touchkey_chip chip;
	54	unsigned int key_code;
	55	unsigned int key_val;
	56	unsigned short keycodes[];
	57	};
	58
	59	static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
	60	{
	61	struct mcs_touchkey_data *data = dev_id;
	62	struct mcs_touchkey_chip *chip = &data->chip;
	63	struct i2c_client *client = data->client;
	64	struct input_dev *input = data->input_dev;
	65	unsigned int key_val;
	66	unsigned int pressed;
	67	int val;
	68
	69	val = i2c_smbus_read_byte_data(client, chip->status_reg);
	70	if (val < 0) {
	71	dev_err(&client->dev, "i2c read error [%d]\n", val);
	72	goto out;
	73	}
	74
	75	pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
	76	if (chip->press_invert)
	77	pressed ^= chip->press_invert;
	78
	79	/* key_val is 0 when released, so we should use key_val of press. */
	80	if (pressed) {
	81	key_val = val & (0xff >> (8 - chip->pressbit));
	82	if (!key_val)
	83	goto out;
	84	key_val -= chip->baseval;
	85	data->key_code = data->keycodes[key_val];
	86	data->key_val = key_val;
	87	}
	88
	89	input_event(input, EV_MSC, MSC_SCAN, data->key_val);
	90	input_report_key(input, data->key_code, pressed);
	91	input_sync(input);
	92
	93	dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
	94	pressed ? "pressed" : "released");
	95
	96	out:
	97	return IRQ_HANDLED;
	98	}
	99
	100	static int __devinit mcs_touchkey_probe(struct i2c_client *client,
	101	const struct i2c_device_id *id)
	102	{
	103	const struct mcs_platform_data *pdata;
	104	struct mcs_touchkey_data *data;
	105	struct input_dev *input_dev;
	106	unsigned int fw_reg;
	107	int fw_ver;
	108	int error;
	109	int i;
	110
	111	pdata = client->dev.platform_data;
	112	if (!pdata) {
	113	dev_err(&client->dev, "no platform data defined\n");
	114	return -EINVAL;
115	}
116
117	data = kzalloc(sizeof(struct mcs_touchkey_data) +
118	sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
119	GFP_KERNEL);
120	input_dev = input_allocate_device();
121	if (!data \|\| !input_dev) {
122	dev_err(&client->dev, "Failed to allocate memory\n");
123	error = -ENOMEM;
124	goto err_free_mem;
125	}
126
127	data->client = client;
128	data->input_dev = input_dev;
129
130	if (id->driver_data == MCS5000_TOUCHKEY) {
131	data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
132	data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
133	data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
134	fw_reg = MCS5000_TOUCHKEY_FW;
135	} else {
136	data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
137	data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
138	data->chip.press_invert = 1;
139	data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
140	fw_reg = MCS5080_TOUCHKEY_FW;
141	}
142
143	fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
144	if (fw_ver < 0) {
145	error = fw_ver;
146	dev_err(&client->dev, "i2c read error[%d]\n", error);
147	goto err_free_mem;
148	}
149	dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
150
151	input_dev->name = "MELPAS MCS Touchkey";
152	input_dev->id.bustype = BUS_I2C;
153	input_dev->dev.parent = &client->dev;
154	input_dev->evbit[0] = BIT_MASK(EV_KEY);
155	if (!pdata->no_autorepeat)
156	input_dev->evbit[0] \|= BIT_MASK(EV_REP);
157	input_dev->keycode = data->keycodes;
158	input_dev->keycodesize = sizeof(data->keycodes[0]);
159	input_dev->keycodemax = pdata->key_maxval + 1;
160
161	for (i = 0; i < pdata->keymap_size; i++) {
162	unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
163	unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
164
165	data->keycodes[val] = code;
166	__set_bit(code, input_dev->keybit);
167	}
168
169	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
170	input_set_drvdata(input_dev, data);
171
172	if (pdata->cfg_pin)
173	pdata->cfg_pin();
174
adf779c1 HK	175	if (pdata->poweron) {
	176	data->poweron = pdata->poweron;
	177	data->poweron(true);
	178	}
	179
312e8e8a JS	180	error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
	181	IRQF_TRIGGER_FALLING, client->dev.driver->name, data);
	182	if (error) {
	183	dev_err(&client->dev, "Failed to register interrupt\n");
	184	goto err_free_mem;
	185	}
	186
	187	error = input_register_device(input_dev);
	188	if (error)
	189	goto err_free_irq;
	190
	191	i2c_set_clientdata(client, data);
	192	return 0;
	193
	194	err_free_irq:
	195	free_irq(client->irq, data);
	196	err_free_mem:
	197	input_free_device(input_dev);
	198	kfree(data);
	199	return error;
	200	}
	201
	202	static int __devexit mcs_touchkey_remove(struct i2c_client *client)
	203	{
	204	struct mcs_touchkey_data *data = i2c_get_clientdata(client);
	205
	206	free_irq(client->irq, data);
adf779c1 HK	207	if (data->poweron)
adf779c1 HK	208	data->poweron(false);
312e8e8a JS	209	input_unregister_device(data->input_dev);
	210	kfree(data);
	211
	212	return 0;
	213	}
	214
5f62615e HK	215	static void mcs_touchkey_shutdown(struct i2c_client *client)
	216	{
	217	struct mcs_touchkey_data *data = i2c_get_clientdata(client);
	218
	219	if (data->poweron)
	220	data->poweron(false);
	221	}
	222
adf779c1 HK	223	#ifdef CONFIG_PM_SLEEP
	224	static int mcs_touchkey_suspend(struct device *dev)
	225	{
	226	struct mcs_touchkey_data *data = dev_get_drvdata(dev);
	227	struct i2c_client *client = data->client;
	228
	229	/* Disable the work */
	230	disable_irq(client->irq);
	231
	232	/* Finally turn off the power */
	233	if (data->poweron)
	234	data->poweron(false);
	235
	236	return 0;
	237	}
	238
	239	static int mcs_touchkey_resume(struct device *dev)
	240	{
	241	struct mcs_touchkey_data *data = dev_get_drvdata(dev);
	242	struct i2c_client *client = data->client;
	243
	244	/* Enable the device first */
	245	if (data->poweron)
	246	data->poweron(true);
	247
	248	/* Enable irq again */
	249	enable_irq(client->irq);
	250
	251	return 0;
	252	}
	253	#endif
	254
	255	static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
	256	mcs_touchkey_suspend, mcs_touchkey_resume);
	257
312e8e8a JS	258	static const struct i2c_device_id mcs_touchkey_id[] = {
	259	{ "mcs5000_touchkey", MCS5000_TOUCHKEY },
	260	{ "mcs5080_touchkey", MCS5080_TOUCHKEY },
	261	{ }
	262	};
	263	MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
	264
	265	static struct i2c_driver mcs_touchkey_driver = {
	266	.driver = {
	267	.name = "mcs_touchkey",
	268	.owner = THIS_MODULE,
adf779c1	269	.pm = &mcs_touchkey_pm_ops,
312e8e8a JS	270	},
	271	.probe = mcs_touchkey_probe,
	272	.remove = __devexit_p(mcs_touchkey_remove),
5f62615e	273	.shutdown = mcs_touchkey_shutdown,
312e8e8a JS	274	.id_table = mcs_touchkey_id,
	275	};
	276
1b92c1cf	277	module_i2c_driver(mcs_touchkey_driver);
312e8e8a JS	278
	279	/* Module information */
	280	MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
	281	MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
	282	MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
	283	MODULE_LICENSE("GPL");