[linux.git] / drivers / gpio / gpio-tps65910.c

/*
 * TI TPS6591x GPIO driver
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <[email protected]>
 * Author: Jorge Eduardo Candelaria [email protected]>
 *
 *  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/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps65910.h>
#include <linux/of_device.h>

struct tps65910_gpio {
	struct gpio_chip gpio_chip;
	struct tps65910 *tps65910;
};

static inline struct tps65910_gpio *to_tps65910_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct tps65910_gpio, gpio_chip);
}

static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
	unsigned int val;

	tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val);

	if (val & GPIO_STS_MASK)
		return 1;

	return 0;
}

static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
			      int value)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;

	if (value)
		tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_SET_MASK);
	else
		tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_SET_MASK);
}

static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
				int value)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;

	/* Set the initial value */
	tps65910_gpio_set(gc, offset, value);

	return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_CFG_MASK);
}

static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;

	return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_CFG_MASK);
}

#ifdef CONFIG_OF
static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
		struct tps65910 *tps65910, int chip_ngpio)
{
	struct tps65910_board *tps65910_board = tps65910->of_plat_data;
	unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
	int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
	int ret;
	int idx;

	tps65910_board->gpio_base = -1;
	ret = of_property_read_u32_array(tps65910->dev->of_node,
			"ti,en-gpio-sleep", prop_array, ngpio);
	if (ret < 0) {
		dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
		return tps65910_board;
	}

	for (idx = 0; idx < ngpio; idx++)
		tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);

	return tps65910_board;
}
#else
static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
		struct tps65910 *tps65910, int chip_ngpio)
{
	return NULL;
}
#endif

static int tps65910_gpio_probe(struct platform_device *pdev)
{
	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
	struct tps65910_gpio *tps65910_gpio;
	int ret;
	int i;

	tps65910_gpio = devm_kzalloc(&pdev->dev,
				sizeof(*tps65910_gpio), GFP_KERNEL);
	if (!tps65910_gpio) {
		dev_err(&pdev->dev, "Could not allocate tps65910_gpio\n");
		return -ENOMEM;
	}

	tps65910_gpio->tps65910 = tps65910;

	tps65910_gpio->gpio_chip.owner = THIS_MODULE;
	tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;

	switch (tps65910_chip_id(tps65910)) {
	case TPS65910:
		tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
		break;
	case TPS65911:
		tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
		break;
	default:
		return -EINVAL;
	}
	tps65910_gpio->gpio_chip.can_sleep = 1;
	tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
	tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
	tps65910_gpio->gpio_chip.set	= tps65910_gpio_set;
	tps65910_gpio->gpio_chip.get	= tps65910_gpio_get;
	tps65910_gpio->gpio_chip.dev = &pdev->dev;
#ifdef CONFIG_OF_GPIO
	tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
#endif
	if (pdata && pdata->gpio_base)
		tps65910_gpio->gpio_chip.base = pdata->gpio_base;
	else
		tps65910_gpio->gpio_chip.base = -1;

	if (!pdata && tps65910->dev->of_node)
		pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
			tps65910_gpio->gpio_chip.ngpio);

	if (!pdata)
		goto skip_init;

	/* Configure sleep control for gpios if provided */
	for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
		if (!pdata->en_gpio_sleep[i])
			continue;

		ret = tps65910_reg_set_bits(tps65910,
			TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
		if (ret < 0)
			dev_warn(tps65910->dev,
				"GPIO Sleep setting failed with err %d\n", ret);
	}

skip_init:
	ret = gpiochip_add(&tps65910_gpio->gpio_chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, tps65910_gpio);

	return ret;
}

static int tps65910_gpio_remove(struct platform_device *pdev)
{
	struct tps65910_gpio *tps65910_gpio = platform_get_drvdata(pdev);

	return gpiochip_remove(&tps65910_gpio->gpio_chip);
}

static struct platform_driver tps65910_gpio_driver = {
	.driver.name    = "tps65910-gpio",
	.driver.owner   = THIS_MODULE,
	.probe		= tps65910_gpio_probe,
	.remove		= tps65910_gpio_remove,
};

static int __init tps65910_gpio_init(void)
{
	return platform_driver_register(&tps65910_gpio_driver);
}
subsys_initcall(tps65910_gpio_init);

static void __exit tps65910_gpio_exit(void)
{
	platform_driver_unregister(&tps65910_gpio_driver);
}
module_exit(tps65910_gpio_exit);

MODULE_AUTHOR("Graeme Gregory <[email protected]>");
MODULE_AUTHOR("Jorge Eduardo Candelaria [email protected]>");
MODULE_DESCRIPTION("GPIO interface for TPS65910/TPS6511 PMICs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65910-gpio");
Commit	Line	Data
2537df72	1	/*
c103de24	2	* TI TPS6591x GPIO driver
2537df72 GG	3	*
	4	* Copyright 2010 Texas Instruments Inc.
	5	*
	6	* Author: Graeme Gregory <[email protected]>
	7	* Author: Jorge Eduardo Candelaria [email protected]>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/errno.h>
	19	#include <linux/gpio.h>
	20	#include <linux/i2c.h>
10bbc48d	21	#include <linux/platform_device.h>
2537df72	22	#include <linux/mfd/tps65910.h>
6fe02e9f	23	#include <linux/of_device.h>
2537df72	24
10bbc48d LD	25	struct tps65910_gpio {
	26	struct gpio_chip gpio_chip;
	27	struct tps65910 *tps65910;
	28	};
	29
	30	static inline struct tps65910_gpio to_tps65910_gpio(struct gpio_chip chip)
	31	{
	32	return container_of(chip, struct tps65910_gpio, gpio_chip);
	33	}
	34
2537df72 GG	35	static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
2537df72 GG	36	{
10bbc48d LD	37	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
10bbc48d LD	38	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
3f7e8275	39	unsigned int val;
2537df72	40
3f7e8275	41	tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val);
2537df72	42
11ad14f8	43	if (val & GPIO_STS_MASK)
2537df72 GG	44	return 1;
	45
	46	return 0;
	47	}
	48
	49	static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
	50	int value)
	51	{
10bbc48d LD	52	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
10bbc48d LD	53	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
2537df72 GG	54
2537df72 GG	55	if (value)
3f7e8275	56	tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
11ad14f8	57	GPIO_SET_MASK);
2537df72	58	else
3f7e8275	59	tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
11ad14f8	60	GPIO_SET_MASK);
2537df72 GG	61	}
	62
	63	static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
	64	int value)
	65	{
10bbc48d LD	66	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
10bbc48d LD	67	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
2537df72 GG	68
2537df72 GG	69	/* Set the initial value */
94bd2442	70	tps65910_gpio_set(gc, offset, value);
2537df72	71
3f7e8275	72	return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
11ad14f8	73	GPIO_CFG_MASK);
2537df72 GG	74	}
	75
	76	static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
	77	{
10bbc48d LD	78	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
10bbc48d LD	79	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
2537df72	80
3f7e8275	81	return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
11ad14f8	82	GPIO_CFG_MASK);
2537df72 GG	83	}
2537df72 GG	84
6fe02e9f LD	85	#ifdef CONFIG_OF
	86	static struct tps65910_board tps65910_parse_dt_for_gpio(struct device dev,
	87	struct tps65910 *tps65910, int chip_ngpio)
	88	{
	89	struct tps65910_board *tps65910_board = tps65910->of_plat_data;
	90	unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
	91	int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
	92	int ret;
	93	int idx;
	94
	95	tps65910_board->gpio_base = -1;
	96	ret = of_property_read_u32_array(tps65910->dev->of_node,
	97	"ti,en-gpio-sleep", prop_array, ngpio);
	98	if (ret < 0) {
	99	dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
	100	return tps65910_board;
	101	}
	102
	103	for (idx = 0; idx < ngpio; idx++)
	104	tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
	105
	106	return tps65910_board;
	107	}
	108	#else
	109	static struct tps65910_board tps65910_parse_dt_for_gpio(struct device dev,
	110	struct tps65910 *tps65910, int chip_ngpio)
	111	{
	112	return NULL;
	113	}
	114	#endif
	115
3836309d	116	static int tps65910_gpio_probe(struct platform_device *pdev)
2537df72	117	{
10bbc48d LD	118	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
	119	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
	120	struct tps65910_gpio *tps65910_gpio;
2537df72	121	int ret;
10bbc48d LD	122	int i;
	123
	124	tps65910_gpio = devm_kzalloc(&pdev->dev,
	125	sizeof(*tps65910_gpio), GFP_KERNEL);
	126	if (!tps65910_gpio) {
	127	dev_err(&pdev->dev, "Could not allocate tps65910_gpio\n");
	128	return -ENOMEM;
	129	}
2537df72	130
10bbc48d	131	tps65910_gpio->tps65910 = tps65910;
2537df72	132
10bbc48d LD	133	tps65910_gpio->gpio_chip.owner = THIS_MODULE;
10bbc48d LD	134	tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
11ad14f8	135
195c65e8	136	switch (tps65910_chip_id(tps65910)) {
11ad14f8	137	case TPS65910:
10bbc48d	138	tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
58956ba2	139	break;
11ad14f8	140	case TPS65911:
10bbc48d	141	tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
58956ba2	142	break;
11ad14f8	143	default:
10bbc48d	144	return -EINVAL;
11ad14f8	145	}
10bbc48d LD	146	tps65910_gpio->gpio_chip.can_sleep = 1;
	147	tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
	148	tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
	149	tps65910_gpio->gpio_chip.set = tps65910_gpio_set;
	150	tps65910_gpio->gpio_chip.get = tps65910_gpio_get;
	151	tps65910_gpio->gpio_chip.dev = &pdev->dev;
bb39b655	152	#ifdef CONFIG_OF_GPIO
626f9914	153	tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
bb39b655	154	#endif
10bbc48d LD	155	if (pdata && pdata->gpio_base)
	156	tps65910_gpio->gpio_chip.base = pdata->gpio_base;
	157	else
	158	tps65910_gpio->gpio_chip.base = -1;
	159
6fe02e9f LD	160	if (!pdata && tps65910->dev->of_node)
	161	pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
	162	tps65910_gpio->gpio_chip.ngpio);
	163
10bbc48d LD	164	if (!pdata)
	165	goto skip_init;
	166
	167	/* Configure sleep control for gpios if provided */
	168	for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
	169	if (!pdata->en_gpio_sleep[i])
	170	continue;
	171
	172	ret = tps65910_reg_set_bits(tps65910,
	173	TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
	174	if (ret < 0)
	175	dev_warn(tps65910->dev,
	176	"GPIO Sleep setting failed with err %d\n", ret);
	177	}
	178
	179	skip_init:
	180	ret = gpiochip_add(&tps65910_gpio->gpio_chip);
	181	if (ret < 0) {
	182	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	183	return ret;
9467d298 LD	184	}
9467d298 LD	185
10bbc48d	186	platform_set_drvdata(pdev, tps65910_gpio);
2537df72	187
10bbc48d	188	return ret;
2537df72	189	}
10bbc48d	190
206210ce	191	static int tps65910_gpio_remove(struct platform_device *pdev)
10bbc48d LD	192	{
	193	struct tps65910_gpio *tps65910_gpio = platform_get_drvdata(pdev);
	194
	195	return gpiochip_remove(&tps65910_gpio->gpio_chip);
	196	}
	197
	198	static struct platform_driver tps65910_gpio_driver = {
	199	.driver.name = "tps65910-gpio",
	200	.driver.owner = THIS_MODULE,
	201	.probe = tps65910_gpio_probe,
8283c4ff	202	.remove = tps65910_gpio_remove,
10bbc48d LD	203	};
	204
	205	static int __init tps65910_gpio_init(void)
	206	{
	207	return platform_driver_register(&tps65910_gpio_driver);
	208	}
	209	subsys_initcall(tps65910_gpio_init);
	210
	211	static void __exit tps65910_gpio_exit(void)
	212	{
	213	platform_driver_unregister(&tps65910_gpio_driver);
	214	}
	215	module_exit(tps65910_gpio_exit);
	216
	217	MODULE_AUTHOR("Graeme Gregory <[email protected]>");
	218	MODULE_AUTHOR("Jorge Eduardo Candelaria [email protected]>");
	219	MODULE_DESCRIPTION("GPIO interface for TPS65910/TPS6511 PMICs");
	220	MODULE_LICENSE("GPL v2");
	221	MODULE_ALIAS("platform:tps65910-gpio");