[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpio / pca953x.c

/*
 *  pca953x.c - 4/8/16 bit I/O ports
 *
 *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
 *  Copyright (C) 2007 Marvell International Ltd.
 *
 *  Derived from drivers/i2c/chips/pca9539.c
 *
 *  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; version 2 of the License.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c/pca953x.h>

#include <asm/gpio.h>

#define PCA953X_INPUT          0
#define PCA953X_OUTPUT         1
#define PCA953X_INVERT         2
#define PCA953X_DIRECTION      3

static const struct i2c_device_id pca953x_id[] = {
	{ "pca9534", 8, },
	{ "pca9535", 16, },
	{ "pca9536", 4, },
	{ "pca9537", 4, },
	{ "pca9538", 8, },
	{ "pca9539", 16, },
	{ "pca9554", 8, },
	{ "pca9555", 16, },
	{ "pca9557", 8, },
	{ "max7310", 8, },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pca953x_id);

struct pca953x_chip {
	unsigned gpio_start;
	uint16_t reg_output;
	uint16_t reg_direction;

	struct i2c_client *client;
	struct gpio_chip gpio_chip;
};

/* NOTE:  we can't currently rely on fault codes to come from SMBus
 * calls, so we map all errors to EIO here and return zero otherwise.
 */
static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
{
	int ret;

	if (chip->gpio_chip.ngpio <= 8)
		ret = i2c_smbus_write_byte_data(chip->client, reg, val);
	else
		ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed writing register\n");
		return -EIO;
	}

	return 0;
}

static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
{
	int ret;

	if (chip->gpio_chip.ngpio <= 8)
		ret = i2c_smbus_read_byte_data(chip->client, reg);
	else
		ret = i2c_smbus_read_word_data(chip->client, reg << 1);

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed reading register\n");
		return -EIO;
	}

	*val = (uint16_t)ret;
	return 0;
}

static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip;
	uint16_t reg_val;
	int ret;

	chip = container_of(gc, struct pca953x_chip, gpio_chip);

	reg_val = chip->reg_direction | (1u << off);
	ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
	if (ret)
		return ret;

	chip->reg_direction = reg_val;
	return 0;
}

static int pca953x_gpio_direction_output(struct gpio_chip *gc,
		unsigned off, int val)
{
	struct pca953x_chip *chip;
	uint16_t reg_val;
	int ret;

	chip = container_of(gc, struct pca953x_chip, gpio_chip);

	/* set output level */
	if (val)
		reg_val = chip->reg_output | (1u << off);
	else
		reg_val = chip->reg_output & ~(1u << off);

	ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
	if (ret)
		return ret;

	chip->reg_output = reg_val;

	/* then direction */
	reg_val = chip->reg_direction & ~(1u << off);
	ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
	if (ret)
		return ret;

	chip->reg_direction = reg_val;
	return 0;
}

static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip;
	uint16_t reg_val;
	int ret;

	chip = container_of(gc, struct pca953x_chip, gpio_chip);

	ret = pca953x_read_reg(chip, PCA953X_INPUT, &reg_val);
	if (ret < 0) {
		/* NOTE:  diagnostic already emitted; that's all we should
		 * do unless gpio_*_value_cansleep() calls become different
		 * from their nonsleeping siblings (and report faults).
		 */
		return 0;
	}

	return (reg_val & (1u << off)) ? 1 : 0;
}

static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
{
	struct pca953x_chip *chip;
	uint16_t reg_val;
	int ret;

	chip = container_of(gc, struct pca953x_chip, gpio_chip);

	if (val)
		reg_val = chip->reg_output | (1u << off);
	else
		reg_val = chip->reg_output & ~(1u << off);

	ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
	if (ret)
		return;

	chip->reg_output = reg_val;
}

static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
{
	struct gpio_chip *gc;

	gc = &chip->gpio_chip;

	gc->direction_input  = pca953x_gpio_direction_input;
	gc->direction_output = pca953x_gpio_direction_output;
	gc->get = pca953x_gpio_get_value;
	gc->set = pca953x_gpio_set_value;
	gc->can_sleep = 1;

	gc->base = chip->gpio_start;
	gc->ngpio = gpios;
	gc->label = chip->client->name;
	gc->dev = &chip->client->dev;
	gc->owner = THIS_MODULE;
}

static int __devinit pca953x_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	struct pca953x_platform_data *pdata;
	struct pca953x_chip *chip;
	int ret;

	pdata = client->dev.platform_data;
	if (pdata == NULL)
		return -ENODEV;

	chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;

	chip->client = client;

	chip->gpio_start = pdata->gpio_base;

	/* initialize cached registers from their original values.
	 * we can't share this chip with another i2c master.
	 */
	pca953x_setup_gpio(chip, id->driver_data);

	ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
	if (ret)
		goto out_failed;

	ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
	if (ret)
		goto out_failed;

	/* set platform specific polarity inversion */
	ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
	if (ret)
		goto out_failed;


	ret = gpiochip_add(&chip->gpio_chip);
	if (ret)
		goto out_failed;

	if (pdata->setup) {
		ret = pdata->setup(client, chip->gpio_chip.base,
				chip->gpio_chip.ngpio, pdata->context);
		if (ret < 0)
			dev_warn(&client->dev, "setup failed, %d\n", ret);
	}

	i2c_set_clientdata(client, chip);
	return 0;

out_failed:
	kfree(chip);
	return ret;
}

static int pca953x_remove(struct i2c_client *client)
{
	struct pca953x_platform_data *pdata = client->dev.platform_data;
	struct pca953x_chip *chip = i2c_get_clientdata(client);
	int ret = 0;

	if (pdata->teardown) {
		ret = pdata->teardown(client, chip->gpio_chip.base,
				chip->gpio_chip.ngpio, pdata->context);
		if (ret < 0) {
			dev_err(&client->dev, "%s failed, %d\n",
					"teardown", ret);
			return ret;
		}
	}

	ret = gpiochip_remove(&chip->gpio_chip);
	if (ret) {
		dev_err(&client->dev, "%s failed, %d\n",
				"gpiochip_remove()", ret);
		return ret;
	}

	kfree(chip);
	return 0;
}

static struct i2c_driver pca953x_driver = {
	.driver = {
		.name	= "pca953x",
	},
	.probe		= pca953x_probe,
	.remove		= pca953x_remove,
	.id_table	= pca953x_id,
};

static int __init pca953x_init(void)
{
	return i2c_add_driver(&pca953x_driver);
}
/* register after i2c postcore initcall and before
 * subsys initcalls that may rely on these GPIOs
 */
subsys_initcall(pca953x_init);

static void __exit pca953x_exit(void)
{
	i2c_del_driver(&pca953x_driver);
}
module_exit(pca953x_exit);

MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
MODULE_LICENSE("GPL");
Commit	Line	Data
9e60fdcf	1	/*
f5e8ff48	2	* pca953x.c - 4/8/16 bit I/O ports
9e60fdcf	3	*
	4	* Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
	5	* Copyright (C) 2007 Marvell International Ltd.
	6	*
	7	* Derived from drivers/i2c/chips/pca9539.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 as published by
	11	* the Free Software Foundation; version 2 of the License.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/i2c.h>
d1c057e3	17	#include <linux/i2c/pca953x.h>
9e60fdcf	18
	19	#include <asm/gpio.h>
	20
f5e8ff48 GL	21	#define PCA953X_INPUT 0
	22	#define PCA953X_OUTPUT 1
	23	#define PCA953X_INVERT 2
	24	#define PCA953X_DIRECTION 3
9e60fdcf	25
3760f736	26	static const struct i2c_device_id pca953x_id[] = {
f5e8ff48 GL	27	{ "pca9534", 8, },
	28	{ "pca9535", 16, },
	29	{ "pca9536", 4, },
	30	{ "pca9537", 4, },
	31	{ "pca9538", 8, },
	32	{ "pca9539", 16, },
69292b34	33	{ "pca9554", 8, },
f39e5781 WN	34	{ "pca9555", 16, },
f39e5781 WN	35	{ "pca9557", 8, },
7059d4b0	36	{ "max7310", 8, },
3760f736	37	{ }
f5e8ff48	38	};
3760f736	39	MODULE_DEVICE_TABLE(i2c, pca953x_id);
9e60fdcf	40
f3dc3630	41	struct pca953x_chip {
9e60fdcf	42	unsigned gpio_start;
	43	uint16_t reg_output;
	44	uint16_t reg_direction;
	45
	46	struct i2c_client *client;
	47	struct gpio_chip gpio_chip;
	48	};
	49
	50	/* NOTE: we can't currently rely on fault codes to come from SMBus
	51	* calls, so we map all errors to EIO here and return zero otherwise.
	52	*/
f3dc3630	53	static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
9e60fdcf	54	{
f5e8ff48 GL	55	int ret;
	56
	57	if (chip->gpio_chip.ngpio <= 8)
	58	ret = i2c_smbus_write_byte_data(chip->client, reg, val);
9e60fdcf	59	else
f5e8ff48 GL	60	ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
	61
	62	if (ret < 0) {
	63	dev_err(&chip->client->dev, "failed writing register\n");
	64	return -EIO;
	65	}
	66
	67	return 0;
9e60fdcf	68	}
9e60fdcf	69
f3dc3630	70	static int pca953x_read_reg(struct pca953x_chip chip, int reg, uint16_t val)
9e60fdcf	71	{
	72	int ret;
	73
f5e8ff48 GL	74	if (chip->gpio_chip.ngpio <= 8)
	75	ret = i2c_smbus_read_byte_data(chip->client, reg);
	76	else
	77	ret = i2c_smbus_read_word_data(chip->client, reg << 1);
	78
9e60fdcf	79	if (ret < 0) {
	80	dev_err(&chip->client->dev, "failed reading register\n");
	81	return -EIO;
	82	}
	83
	84	*val = (uint16_t)ret;
	85	return 0;
	86	}
	87
f3dc3630	88	static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
9e60fdcf	89	{
f3dc3630	90	struct pca953x_chip *chip;
9e60fdcf	91	uint16_t reg_val;
	92	int ret;
	93
f3dc3630	94	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	95
9e60fdcf	96	reg_val = chip->reg_direction \| (1u << off);
f3dc3630	97	ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
9e60fdcf	98	if (ret)
	99	return ret;
	100
	101	chip->reg_direction = reg_val;
	102	return 0;
	103	}
	104
f3dc3630	105	static int pca953x_gpio_direction_output(struct gpio_chip *gc,
9e60fdcf	106	unsigned off, int val)
9e60fdcf	107	{
f3dc3630	108	struct pca953x_chip *chip;
9e60fdcf	109	uint16_t reg_val;
	110	int ret;
	111
f3dc3630	112	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	113
	114	/* set output level */
	115	if (val)
	116	reg_val = chip->reg_output \| (1u << off);
	117	else
	118	reg_val = chip->reg_output & ~(1u << off);
	119
f3dc3630	120	ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
9e60fdcf	121	if (ret)
	122	return ret;
	123
	124	chip->reg_output = reg_val;
	125
	126	/* then direction */
	127	reg_val = chip->reg_direction & ~(1u << off);
f3dc3630	128	ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
9e60fdcf	129	if (ret)
	130	return ret;
	131
	132	chip->reg_direction = reg_val;
	133	return 0;
	134	}
	135
f3dc3630	136	static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
9e60fdcf	137	{
f3dc3630	138	struct pca953x_chip *chip;
9e60fdcf	139	uint16_t reg_val;
	140	int ret;
	141
f3dc3630	142	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	143
f3dc3630	144	ret = pca953x_read_reg(chip, PCA953X_INPUT, &reg_val);
9e60fdcf	145	if (ret < 0) {
	146	/* NOTE: diagnostic already emitted; that's all we should
	147	* do unless gpio_*_value_cansleep() calls become different
	148	* from their nonsleeping siblings (and report faults).
	149	*/
	150	return 0;
	151	}
	152
	153	return (reg_val & (1u << off)) ? 1 : 0;
	154	}
	155
f3dc3630	156	static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
9e60fdcf	157	{
f3dc3630	158	struct pca953x_chip *chip;
9e60fdcf	159	uint16_t reg_val;
	160	int ret;
	161
f3dc3630	162	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	163
	164	if (val)
	165	reg_val = chip->reg_output \| (1u << off);
	166	else
	167	reg_val = chip->reg_output & ~(1u << off);
	168
f3dc3630	169	ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
9e60fdcf	170	if (ret)
	171	return;
	172
	173	chip->reg_output = reg_val;
	174	}
	175
f5e8ff48	176	static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
9e60fdcf	177	{
	178	struct gpio_chip *gc;
	179
	180	gc = &chip->gpio_chip;
	181
f3dc3630 GL	182	gc->direction_input = pca953x_gpio_direction_input;
	183	gc->direction_output = pca953x_gpio_direction_output;
	184	gc->get = pca953x_gpio_get_value;
	185	gc->set = pca953x_gpio_set_value;
84207805	186	gc->can_sleep = 1;
9e60fdcf	187
9e60fdcf	188	gc->base = chip->gpio_start;
f5e8ff48 GL	189	gc->ngpio = gpios;
f5e8ff48 GL	190	gc->label = chip->client->name;
d8f388d8	191	gc->dev = &chip->client->dev;
d72cbed0	192	gc->owner = THIS_MODULE;
9e60fdcf	193	}
9e60fdcf	194
d2653e92	195	static int __devinit pca953x_probe(struct i2c_client *client,
3760f736	196	const struct i2c_device_id *id)
9e60fdcf	197	{
f3dc3630 GL	198	struct pca953x_platform_data *pdata;
f3dc3630 GL	199	struct pca953x_chip *chip;
f39e5781	200	int ret;
9e60fdcf	201
	202	pdata = client->dev.platform_data;
	203	if (pdata == NULL)
	204	return -ENODEV;
	205
f3dc3630	206	chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
9e60fdcf	207	if (chip == NULL)
	208	return -ENOMEM;
	209
	210	chip->client = client;
	211
	212	chip->gpio_start = pdata->gpio_base;
	213
	214	/* initialize cached registers from their original values.
	215	* we can't share this chip with another i2c master.
	216	*/
f5e8ff48 GL	217	pca953x_setup_gpio(chip, id->driver_data);
f5e8ff48 GL	218
f3dc3630	219	ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
9e60fdcf	220	if (ret)
	221	goto out_failed;
	222
f3dc3630	223	ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
9e60fdcf	224	if (ret)
	225	goto out_failed;
	226
	227	/* set platform specific polarity inversion */
f3dc3630	228	ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
9e60fdcf	229	if (ret)
	230	goto out_failed;
	231
f5e8ff48 GL	232
f5e8ff48 GL	233	ret = gpiochip_add(&chip->gpio_chip);
9e60fdcf	234	if (ret)
	235	goto out_failed;
	236
	237	if (pdata->setup) {
	238	ret = pdata->setup(client, chip->gpio_chip.base,
	239	chip->gpio_chip.ngpio, pdata->context);
	240	if (ret < 0)
	241	dev_warn(&client->dev, "setup failed, %d\n", ret);
	242	}
	243
	244	i2c_set_clientdata(client, chip);
	245	return 0;
	246
	247	out_failed:
	248	kfree(chip);
	249	return ret;
	250	}
	251
f3dc3630	252	static int pca953x_remove(struct i2c_client *client)
9e60fdcf	253	{
f3dc3630 GL	254	struct pca953x_platform_data *pdata = client->dev.platform_data;
f3dc3630 GL	255	struct pca953x_chip *chip = i2c_get_clientdata(client);
9e60fdcf	256	int ret = 0;
	257
	258	if (pdata->teardown) {
	259	ret = pdata->teardown(client, chip->gpio_chip.base,
	260	chip->gpio_chip.ngpio, pdata->context);
	261	if (ret < 0) {
	262	dev_err(&client->dev, "%s failed, %d\n",
	263	"teardown", ret);
	264	return ret;
	265	}
	266	}
	267
	268	ret = gpiochip_remove(&chip->gpio_chip);
	269	if (ret) {
	270	dev_err(&client->dev, "%s failed, %d\n",
	271	"gpiochip_remove()", ret);
	272	return ret;
	273	}
	274
	275	kfree(chip);
	276	return 0;
	277	}
	278
f3dc3630	279	static struct i2c_driver pca953x_driver = {
9e60fdcf	280	.driver = {
f3dc3630	281	.name = "pca953x",
9e60fdcf	282	},
f3dc3630 GL	283	.probe = pca953x_probe,
f3dc3630 GL	284	.remove = pca953x_remove,
3760f736	285	.id_table = pca953x_id,
9e60fdcf	286	};
9e60fdcf	287
f3dc3630	288	static int __init pca953x_init(void)
9e60fdcf	289	{
f3dc3630	290	return i2c_add_driver(&pca953x_driver);
9e60fdcf	291	}
2f8d1197 DB	292	/* register after i2c postcore initcall and before
	293	* subsys initcalls that may rely on these GPIOs
	294	*/
	295	subsys_initcall(pca953x_init);
9e60fdcf	296
f3dc3630	297	static void __exit pca953x_exit(void)
9e60fdcf	298	{
f3dc3630	299	i2c_del_driver(&pca953x_driver);
9e60fdcf	300	}
f3dc3630	301	module_exit(pca953x_exit);
9e60fdcf	302
9e60fdcf	303	MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
f3dc3630	304	MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
9e60fdcf	305	MODULE_LICENSE("GPL");