[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>
#ifdef CONFIG_OF_GPIO
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#endif

#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, },
	{ "pca6107", 8, },
	{ "tca6408", 8, },
	{ "tca6416", 16, },
	/* NYET:  { "tca6424", 24, }, */
	{ }
};
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 pca953x_platform_data *dyn_pdata;
	struct gpio_chip gpio_chip;
	char **names;
};

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 ret;
	}

	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 ret;
	}

	*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;
	gc->names = chip->names;
}

/*
 * Handlers for alternative sources of platform_data
 */
#ifdef CONFIG_OF_GPIO
/*
 * Translate OpenFirmware node properties into platform_data
 */
static struct pca953x_platform_data *
pca953x_get_alt_pdata(struct i2c_client *client)
{
	struct pca953x_platform_data *pdata;
	struct device_node *node;
	const uint16_t *val;

	node = dev_archdata_get_node(&client->dev.archdata);
	if (node == NULL)
		return NULL;

	pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
	if (pdata == NULL) {
		dev_err(&client->dev, "Unable to allocate platform_data\n");
		return NULL;
	}

	pdata->gpio_base = -1;
	val = of_get_property(node, "linux,gpio-base", NULL);
	if (val) {
		if (*val < 0)
			dev_warn(&client->dev,
				 "invalid gpio-base in device tree\n");
		else
			pdata->gpio_base = *val;
	}

	val = of_get_property(node, "polarity", NULL);
	if (val)
		pdata->invert = *val;

	return pdata;
}
#else
static struct pca953x_platform_data *
pca953x_get_alt_pdata(struct i2c_client *client)
{
	return NULL;
}
#endif

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;

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

	pdata = client->dev.platform_data;
	if (pdata == NULL) {
		pdata = pca953x_get_alt_pdata(client);
		/*
		 * Unlike normal platform_data, this is allocated
		 * dynamically and must be freed in the driver
		 */
		chip->dyn_pdata = pdata;
	}

	if (pdata == NULL) {
		dev_dbg(&client->dev, "no platform data\n");
		ret = -EINVAL;
		goto out_failed;
	}

	chip->client = client;

	chip->gpio_start = pdata->gpio_base;

	chip->names = pdata->names;

	/* 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->dyn_pdata);
	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->dyn_pdata);
	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>
1965d303 NC	18	#ifdef CONFIG_OF_GPIO
	19	#include <linux/of_platform.h>
	20	#include <linux/of_gpio.h>
	21	#endif
9e60fdcf	22
	23	#include <asm/gpio.h>
	24
f5e8ff48 GL	25	#define PCA953X_INPUT 0
	26	#define PCA953X_OUTPUT 1
	27	#define PCA953X_INVERT 2
	28	#define PCA953X_DIRECTION 3
9e60fdcf	29
3760f736	30	static const struct i2c_device_id pca953x_id[] = {
f5e8ff48 GL	31	{ "pca9534", 8, },
	32	{ "pca9535", 16, },
	33	{ "pca9536", 4, },
	34	{ "pca9537", 4, },
	35	{ "pca9538", 8, },
	36	{ "pca9539", 16, },
69292b34	37	{ "pca9554", 8, },
f39e5781 WN	38	{ "pca9555", 16, },
f39e5781 WN	39	{ "pca9557", 8, },
ab5dc372	40
7059d4b0	41	{ "max7310", 8, },
ab5dc372 DB	42	{ "pca6107", 8, },
	43	{ "tca6408", 8, },
	44	{ "tca6416", 16, },
	45	/* NYET: { "tca6424", 24, }, */
3760f736	46	{ }
f5e8ff48	47	};
3760f736	48	MODULE_DEVICE_TABLE(i2c, pca953x_id);
9e60fdcf	49
f3dc3630	50	struct pca953x_chip {
9e60fdcf	51	unsigned gpio_start;
	52	uint16_t reg_output;
	53	uint16_t reg_direction;
	54
	55	struct i2c_client *client;
1965d303	56	struct pca953x_platform_data *dyn_pdata;
9e60fdcf	57	struct gpio_chip gpio_chip;
77906a54	58	char **names;
9e60fdcf	59	};
9e60fdcf	60
f3dc3630	61	static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
9e60fdcf	62	{
f5e8ff48 GL	63	int ret;
	64
	65	if (chip->gpio_chip.ngpio <= 8)
	66	ret = i2c_smbus_write_byte_data(chip->client, reg, val);
9e60fdcf	67	else
f5e8ff48 GL	68	ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
	69
	70	if (ret < 0) {
	71	dev_err(&chip->client->dev, "failed writing register\n");
ab5dc372	72	return ret;
f5e8ff48 GL	73	}
	74
	75	return 0;
9e60fdcf	76	}
9e60fdcf	77
f3dc3630	78	static int pca953x_read_reg(struct pca953x_chip chip, int reg, uint16_t val)
9e60fdcf	79	{
	80	int ret;
	81
f5e8ff48 GL	82	if (chip->gpio_chip.ngpio <= 8)
	83	ret = i2c_smbus_read_byte_data(chip->client, reg);
	84	else
	85	ret = i2c_smbus_read_word_data(chip->client, reg << 1);
	86
9e60fdcf	87	if (ret < 0) {
9e60fdcf	88	dev_err(&chip->client->dev, "failed reading register\n");
ab5dc372	89	return ret;
9e60fdcf	90	}
	91
	92	*val = (uint16_t)ret;
	93	return 0;
	94	}
	95
f3dc3630	96	static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
9e60fdcf	97	{
f3dc3630	98	struct pca953x_chip *chip;
9e60fdcf	99	uint16_t reg_val;
	100	int ret;
	101
f3dc3630	102	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	103
9e60fdcf	104	reg_val = chip->reg_direction \| (1u << off);
f3dc3630	105	ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
9e60fdcf	106	if (ret)
	107	return ret;
	108
	109	chip->reg_direction = reg_val;
	110	return 0;
	111	}
	112
f3dc3630	113	static int pca953x_gpio_direction_output(struct gpio_chip *gc,
9e60fdcf	114	unsigned off, int val)
9e60fdcf	115	{
f3dc3630	116	struct pca953x_chip *chip;
9e60fdcf	117	uint16_t reg_val;
	118	int ret;
	119
f3dc3630	120	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	121
	122	/* set output level */
	123	if (val)
	124	reg_val = chip->reg_output \| (1u << off);
	125	else
	126	reg_val = chip->reg_output & ~(1u << off);
	127
f3dc3630	128	ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
9e60fdcf	129	if (ret)
	130	return ret;
	131
	132	chip->reg_output = reg_val;
	133
	134	/* then direction */
	135	reg_val = chip->reg_direction & ~(1u << off);
f3dc3630	136	ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
9e60fdcf	137	if (ret)
	138	return ret;
	139
	140	chip->reg_direction = reg_val;
	141	return 0;
	142	}
	143
f3dc3630	144	static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
9e60fdcf	145	{
f3dc3630	146	struct pca953x_chip *chip;
9e60fdcf	147	uint16_t reg_val;
	148	int ret;
	149
f3dc3630	150	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	151
f3dc3630	152	ret = pca953x_read_reg(chip, PCA953X_INPUT, &reg_val);
9e60fdcf	153	if (ret < 0) {
	154	/* NOTE: diagnostic already emitted; that's all we should
	155	* do unless gpio_*_value_cansleep() calls become different
	156	* from their nonsleeping siblings (and report faults).
	157	*/
	158	return 0;
	159	}
	160
	161	return (reg_val & (1u << off)) ? 1 : 0;
	162	}
	163
f3dc3630	164	static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
9e60fdcf	165	{
f3dc3630	166	struct pca953x_chip *chip;
9e60fdcf	167	uint16_t reg_val;
	168	int ret;
	169
f3dc3630	170	chip = container_of(gc, struct pca953x_chip, gpio_chip);
9e60fdcf	171
	172	if (val)
	173	reg_val = chip->reg_output \| (1u << off);
	174	else
	175	reg_val = chip->reg_output & ~(1u << off);
	176
f3dc3630	177	ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
9e60fdcf	178	if (ret)
	179	return;
	180
	181	chip->reg_output = reg_val;
	182	}
	183
f5e8ff48	184	static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
9e60fdcf	185	{
	186	struct gpio_chip *gc;
	187
	188	gc = &chip->gpio_chip;
	189
f3dc3630 GL	190	gc->direction_input = pca953x_gpio_direction_input;
	191	gc->direction_output = pca953x_gpio_direction_output;
	192	gc->get = pca953x_gpio_get_value;
	193	gc->set = pca953x_gpio_set_value;
84207805	194	gc->can_sleep = 1;
9e60fdcf	195
9e60fdcf	196	gc->base = chip->gpio_start;
f5e8ff48 GL	197	gc->ngpio = gpios;
f5e8ff48 GL	198	gc->label = chip->client->name;
d8f388d8	199	gc->dev = &chip->client->dev;
d72cbed0	200	gc->owner = THIS_MODULE;
77906a54	201	gc->names = chip->names;
9e60fdcf	202	}
9e60fdcf	203
1965d303 NC	204	/*
	205	* Handlers for alternative sources of platform_data
	206	*/
	207	#ifdef CONFIG_OF_GPIO
	208	/*
	209	* Translate OpenFirmware node properties into platform_data
	210	*/
	211	static struct pca953x_platform_data *
	212	pca953x_get_alt_pdata(struct i2c_client *client)
	213	{
	214	struct pca953x_platform_data *pdata;
	215	struct device_node *node;
	216	const uint16_t *val;
	217
	218	node = dev_archdata_get_node(&client->dev.archdata);
	219	if (node == NULL)
	220	return NULL;
	221
	222	pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
	223	if (pdata == NULL) {
	224	dev_err(&client->dev, "Unable to allocate platform_data\n");
	225	return NULL;
	226	}
	227
	228	pdata->gpio_base = -1;
	229	val = of_get_property(node, "linux,gpio-base", NULL);
	230	if (val) {
	231	if (*val < 0)
	232	dev_warn(&client->dev,
	233	"invalid gpio-base in device tree\n");
	234	else
	235	pdata->gpio_base = *val;
	236	}
	237
	238	val = of_get_property(node, "polarity", NULL);
	239	if (val)
	240	pdata->invert = *val;
	241
	242	return pdata;
	243	}
	244	#else
	245	static struct pca953x_platform_data *
	246	pca953x_get_alt_pdata(struct i2c_client *client)
	247	{
	248	return NULL;
	249	}
	250	#endif
	251
d2653e92	252	static int __devinit pca953x_probe(struct i2c_client *client,
3760f736	253	const struct i2c_device_id *id)
9e60fdcf	254	{
f3dc3630 GL	255	struct pca953x_platform_data *pdata;
f3dc3630 GL	256	struct pca953x_chip *chip;
f39e5781	257	int ret;
9e60fdcf	258
1965d303 NC	259	chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
	260	if (chip == NULL)
	261	return -ENOMEM;
	262
9e60fdcf	263	pdata = client->dev.platform_data;
a342d215	264	if (pdata == NULL) {
1965d303 NC	265	pdata = pca953x_get_alt_pdata(client);
	266	/*
	267	* Unlike normal platform_data, this is allocated
	268	* dynamically and must be freed in the driver
	269	*/
	270	chip->dyn_pdata = pdata;
a342d215	271	}
9e60fdcf	272
1965d303 NC	273	if (pdata == NULL) {
	274	dev_dbg(&client->dev, "no platform data\n");
	275	ret = -EINVAL;
	276	goto out_failed;
	277	}
9e60fdcf	278
	279	chip->client = client;
	280
	281	chip->gpio_start = pdata->gpio_base;
	282
77906a54 DS	283	chip->names = pdata->names;
77906a54 DS	284
9e60fdcf	285	/* initialize cached registers from their original values.
	286	* we can't share this chip with another i2c master.
	287	*/
f5e8ff48 GL	288	pca953x_setup_gpio(chip, id->driver_data);
f5e8ff48 GL	289
f3dc3630	290	ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
9e60fdcf	291	if (ret)
	292	goto out_failed;
	293
f3dc3630	294	ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
9e60fdcf	295	if (ret)
	296	goto out_failed;
	297
	298	/* set platform specific polarity inversion */
f3dc3630	299	ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
9e60fdcf	300	if (ret)
	301	goto out_failed;
	302
f5e8ff48 GL	303
f5e8ff48 GL	304	ret = gpiochip_add(&chip->gpio_chip);
9e60fdcf	305	if (ret)
	306	goto out_failed;
	307
	308	if (pdata->setup) {
	309	ret = pdata->setup(client, chip->gpio_chip.base,
	310	chip->gpio_chip.ngpio, pdata->context);
	311	if (ret < 0)
	312	dev_warn(&client->dev, "setup failed, %d\n", ret);
	313	}
	314
	315	i2c_set_clientdata(client, chip);
	316	return 0;
	317
	318	out_failed:
1965d303	319	kfree(chip->dyn_pdata);
9e60fdcf	320	kfree(chip);
	321	return ret;
	322	}
	323
f3dc3630	324	static int pca953x_remove(struct i2c_client *client)
9e60fdcf	325	{
f3dc3630 GL	326	struct pca953x_platform_data *pdata = client->dev.platform_data;
f3dc3630 GL	327	struct pca953x_chip *chip = i2c_get_clientdata(client);
9e60fdcf	328	int ret = 0;
	329
	330	if (pdata->teardown) {
	331	ret = pdata->teardown(client, chip->gpio_chip.base,
	332	chip->gpio_chip.ngpio, pdata->context);
	333	if (ret < 0) {
	334	dev_err(&client->dev, "%s failed, %d\n",
	335	"teardown", ret);
	336	return ret;
	337	}
	338	}
	339
	340	ret = gpiochip_remove(&chip->gpio_chip);
	341	if (ret) {
	342	dev_err(&client->dev, "%s failed, %d\n",
	343	"gpiochip_remove()", ret);
	344	return ret;
	345	}
	346
1965d303	347	kfree(chip->dyn_pdata);
9e60fdcf	348	kfree(chip);
	349	return 0;
	350	}
	351
f3dc3630	352	static struct i2c_driver pca953x_driver = {
9e60fdcf	353	.driver = {
f3dc3630	354	.name = "pca953x",
9e60fdcf	355	},
f3dc3630 GL	356	.probe = pca953x_probe,
f3dc3630 GL	357	.remove = pca953x_remove,
3760f736	358	.id_table = pca953x_id,
9e60fdcf	359	};
9e60fdcf	360
f3dc3630	361	static int __init pca953x_init(void)
9e60fdcf	362	{
f3dc3630	363	return i2c_add_driver(&pca953x_driver);
9e60fdcf	364	}
2f8d1197 DB	365	/* register after i2c postcore initcall and before
	366	* subsys initcalls that may rely on these GPIOs
	367	*/
	368	subsys_initcall(pca953x_init);
9e60fdcf	369
f3dc3630	370	static void __exit pca953x_exit(void)
9e60fdcf	371	{
f3dc3630	372	i2c_del_driver(&pca953x_driver);
9e60fdcf	373	}
f3dc3630	374	module_exit(pca953x_exit);
9e60fdcf	375
9e60fdcf	376	MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
f3dc3630	377	MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
9e60fdcf	378	MODULE_LICENSE("GPL");