[linux.git] / drivers / gpio / gpio-tps65218.c

/*
 * Copyright 2015 Verifone Int.
 *
 * Author: Nicolas Saenz Julienne <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify i t
 * under  the terms of the GNU General  Public License as published by th e
 * Free Software Foundation;  either version 2 of the License, or (at you r
 * option) any later version.
 *
 * This driver is based on the gpio-tps65912 implementation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/tps65218.h>

struct tps65218_gpio {
	struct tps65218 *tps65218;
	struct gpio_chip gpio_chip;
};

static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	unsigned int val;
	int ret;

	ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val);
	if (ret)
		return ret;

	return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
}

static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
			      int value)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;

	if (value)
		tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
				  TPS65218_ENABLE2_GPIO1 << offset,
				  TPS65218_ENABLE2_GPIO1 << offset,
				  TPS65218_PROTECT_L1);
	else
		tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
				    TPS65218_ENABLE2_GPIO1 << offset,
				    TPS65218_PROTECT_L1);
}

static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
				int value)
{
	/* Only drives GPOs */
	tps65218_gpio_set(gc, offset, value);
	return 0;
}

static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
{
	return -EPERM;
}

static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	int ret;

	if (gpiochip_line_is_open_source(gc, offset)) {
		dev_err(gc->parent, "can't work as open source\n");
		return -EINVAL;
	}

	switch (offset) {
	case 0:
		if (!gpiochip_line_is_open_drain(gc, offset)) {
			dev_err(gc->parent, "GPO1 works only as open drain\n");
			return -EINVAL;
		}

		/* Disable sequencer for GPO1 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
					  TPS65218_SEQ7_GPO1_SEQ_MASK,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		/* Setup GPO1 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
					  TPS65218_CONFIG1_IO1_SEL,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		break;
	case 1:
		/* Setup GPO2 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
					  TPS65218_CONFIG1_IO1_SEL,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		break;

	case 2:
		if (!gpiochip_line_is_open_drain(gc, offset)) {
			dev_err(gc->parent, "GPO3 works only as open drain\n");
			return -EINVAL;
		}

		/* Disable sequencer for GPO3 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
					  TPS65218_SEQ7_GPO3_SEQ_MASK,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		/* Setup GPO3 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
					  TPS65218_CONFIG2_DC12_RST,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset,
				    unsigned long config)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	enum pin_config_param param = pinconf_to_config_param(config);

	switch (offset) {
	case 0:
	case 2:
		/* GPO1 is hardwired to be open drain */
		if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
			return 0;
		return -ENOTSUPP;
	case 1:
		/* GPO2 is push-pull by default, can be set as open drain. */
		if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
			return tps65218_clear_bits(tps65218,
						   TPS65218_REG_CONFIG1,
						   TPS65218_CONFIG1_GPO2_BUF,
						   TPS65218_PROTECT_L1);
		if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
			return tps65218_set_bits(tps65218,
						 TPS65218_REG_CONFIG1,
						 TPS65218_CONFIG1_GPO2_BUF,
						 TPS65218_CONFIG1_GPO2_BUF,
						 TPS65218_PROTECT_L1);
		return -ENOTSUPP;
	default:
		break;
	}
	return -ENOTSUPP;
}

static const struct gpio_chip template_chip = {
	.label			= "gpio-tps65218",
	.owner			= THIS_MODULE,
	.request		= tps65218_gpio_request,
	.direction_output	= tps65218_gpio_output,
	.direction_input	= tps65218_gpio_input,
	.get			= tps65218_gpio_get,
	.set			= tps65218_gpio_set,
	.set_config		= tps65218_gpio_set_config,
	.can_sleep		= true,
	.ngpio			= 3,
	.base			= -1,
};

static int tps65218_gpio_probe(struct platform_device *pdev)
{
	struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
	struct tps65218_gpio *tps65218_gpio;
	int ret;

	tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
				     GFP_KERNEL);
	if (!tps65218_gpio)
		return -ENOMEM;

	tps65218_gpio->tps65218 = tps65218;
	tps65218_gpio->gpio_chip = template_chip;
	tps65218_gpio->gpio_chip.parent = &pdev->dev;
#ifdef CONFIG_OF_GPIO
	tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
#endif

	ret = devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
				     tps65218_gpio);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, tps65218_gpio);

	return ret;
}

static const struct of_device_id tps65218_dt_match[] = {
	{ .compatible = "ti,tps65218-gpio" },
	{  }
};
MODULE_DEVICE_TABLE(of, tps65218_dt_match);

static const struct platform_device_id tps65218_gpio_id_table[] = {
	{ "tps65218-gpio", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);

static struct platform_driver tps65218_gpio_driver = {
	.driver = {
		.name = "tps65218-gpio",
		.of_match_table = of_match_ptr(tps65218_dt_match)
	},
	.probe = tps65218_gpio_probe,
	.id_table = tps65218_gpio_id_table,
};

module_platform_driver(tps65218_gpio_driver);

MODULE_AUTHOR("Nicolas Saenz Julienne <[email protected]>");
MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65218-gpio");
Commit	Line	Data
c366c76a NSJ	1	/*
	2	* Copyright 2015 Verifone Int.
	3	*
	4	* Author: Nicolas Saenz Julienne <[email protected]>
	5	*
	6	* This program is free software; you can redistribute it and/or modify i t
	7	* under the terms of the GNU General Public License as published by th e
	8	* Free Software Foundation; either version 2 of the License, or (at you r
	9	* option) any later version.
	10	*
	11	* This driver is based on the gpio-tps65912 implementation.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/errno.h>
	17	#include <linux/gpio/driver.h>
	18	#include <linux/platform_device.h>
0aced355	19	#include <linux/regmap.h>
c366c76a	20	#include <linux/mfd/tps65218.h>
c366c76a NSJ	21
	22	struct tps65218_gpio {
	23	struct tps65218 *tps65218;
	24	struct gpio_chip gpio_chip;
	25	};
	26
	27	static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
	28	{
	29	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	30	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	31	unsigned int val;
	32	int ret;
	33
0aced355	34	ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val);
c366c76a NSJ	35	if (ret)
	36	return ret;
	37
	38	return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
	39	}
	40
	41	static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
	42	int value)
	43	{
	44	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	45	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	46
	47	if (value)
	48	tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
	49	TPS65218_ENABLE2_GPIO1 << offset,
	50	TPS65218_ENABLE2_GPIO1 << offset,
	51	TPS65218_PROTECT_L1);
	52	else
	53	tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
	54	TPS65218_ENABLE2_GPIO1 << offset,
	55	TPS65218_PROTECT_L1);
	56	}
	57
	58	static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
	59	int value)
	60	{
	61	/* Only drives GPOs */
818cc6a5	62	tps65218_gpio_set(gc, offset, value);
c366c76a NSJ	63	return 0;
	64	}
	65
	66	static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
	67	{
	68	return -EPERM;
	69	}
	70
	71	static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
	72	{
	73	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	74	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
c366c76a NSJ	75	int ret;
c366c76a NSJ	76
143b65d6	77	if (gpiochip_line_is_open_source(gc, offset)) {
c366c76a NSJ	78	dev_err(gc->parent, "can't work as open source\n");
	79	return -EINVAL;
	80	}
	81
	82	switch (offset) {
	83	case 0:
143b65d6	84	if (!gpiochip_line_is_open_drain(gc, offset)) {
c366c76a NSJ	85	dev_err(gc->parent, "GPO1 works only as open drain\n");
	86	return -EINVAL;
	87	}
	88
	89	/* Disable sequencer for GPO1 */
	90	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
	91	TPS65218_SEQ7_GPO1_SEQ_MASK,
	92	TPS65218_PROTECT_L1);
	93	if (ret)
	94	return ret;
	95
	96	/* Setup GPO1 */
	97	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
	98	TPS65218_CONFIG1_IO1_SEL,
	99	TPS65218_PROTECT_L1);
	100	if (ret)
	101	return ret;
	102
	103	break;
	104	case 1:
c366c76a NSJ	105	/* Setup GPO2 */
	106	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
	107	TPS65218_CONFIG1_IO1_SEL,
	108	TPS65218_PROTECT_L1);
	109	if (ret)
	110	return ret;
	111
	112	break;
	113
	114	case 2:
143b65d6	115	if (!gpiochip_line_is_open_drain(gc, offset)) {
c366c76a NSJ	116	dev_err(gc->parent, "GPO3 works only as open drain\n");
	117	return -EINVAL;
	118	}
	119
	120	/* Disable sequencer for GPO3 */
	121	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
	122	TPS65218_SEQ7_GPO3_SEQ_MASK,
	123	TPS65218_PROTECT_L1);
	124	if (ret)
	125	return ret;
	126
	127	/* Setup GPO3 */
	128	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
	129	TPS65218_CONFIG2_DC12_RST,
	130	TPS65218_PROTECT_L1);
	131	if (ret)
	132	return ret;
	133
	134	break;
	135	default:
	136	return -EINVAL;
	137	}
	138
	139	return 0;
	140	}
	141
2956b5d9 MW	142	static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset,
2956b5d9 MW	143	unsigned long config)
f30e49f1 LW	144	{
	145	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	146	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
2956b5d9	147	enum pin_config_param param = pinconf_to_config_param(config);
f30e49f1 LW	148
	149	switch (offset) {
	150	case 0:
	151	case 2:
	152	/* GPO1 is hardwired to be open drain */
2956b5d9	153	if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
f30e49f1 LW	154	return 0;
	155	return -ENOTSUPP;
	156	case 1:
	157	/* GPO2 is push-pull by default, can be set as open drain. */
2956b5d9	158	if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
f30e49f1 LW	159	return tps65218_clear_bits(tps65218,
	160	TPS65218_REG_CONFIG1,
	161	TPS65218_CONFIG1_GPO2_BUF,
	162	TPS65218_PROTECT_L1);
2956b5d9	163	if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
f30e49f1 LW	164	return tps65218_set_bits(tps65218,
	165	TPS65218_REG_CONFIG1,
	166	TPS65218_CONFIG1_GPO2_BUF,
	167	TPS65218_CONFIG1_GPO2_BUF,
	168	TPS65218_PROTECT_L1);
	169	return -ENOTSUPP;
	170	default:
	171	break;
	172	}
	173	return -ENOTSUPP;
	174	}
	175
e35b5ab0	176	static const struct gpio_chip template_chip = {
c366c76a NSJ	177	.label = "gpio-tps65218",
	178	.owner = THIS_MODULE,
	179	.request = tps65218_gpio_request,
	180	.direction_output = tps65218_gpio_output,
	181	.direction_input = tps65218_gpio_input,
	182	.get = tps65218_gpio_get,
	183	.set = tps65218_gpio_set,
2956b5d9	184	.set_config = tps65218_gpio_set_config,
c366c76a NSJ	185	.can_sleep = true,
	186	.ngpio = 3,
	187	.base = -1,
	188	};
	189
	190	static int tps65218_gpio_probe(struct platform_device *pdev)
	191	{
	192	struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
	193	struct tps65218_gpio *tps65218_gpio;
	194	int ret;
	195
	196	tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
	197	GFP_KERNEL);
	198	if (!tps65218_gpio)
	199	return -ENOMEM;
	200
	201	tps65218_gpio->tps65218 = tps65218;
	202	tps65218_gpio->gpio_chip = template_chip;
	203	tps65218_gpio->gpio_chip.parent = &pdev->dev;
	204	#ifdef CONFIG_OF_GPIO
	205	tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
	206	#endif
	207
8df759c9 WY	208	ret = devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
8df759c9 WY	209	tps65218_gpio);
c366c76a NSJ	210	if (ret < 0) {
	211	dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
	212	return ret;
	213	}
	214
	215	platform_set_drvdata(pdev, tps65218_gpio);
	216
	217	return ret;
	218	}
	219
c366c76a NSJ	220	static const struct of_device_id tps65218_dt_match[] = {
	221	{ .compatible = "ti,tps65218-gpio" },
	222	{ }
	223	};
	224	MODULE_DEVICE_TABLE(of, tps65218_dt_match);
	225
a944a892 K	226	static const struct platform_device_id tps65218_gpio_id_table[] = {
	227	{ "tps65218-gpio", },
	228	{ /* sentinel */ }
	229	};
	230	MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);
	231
c366c76a NSJ	232	static struct platform_driver tps65218_gpio_driver = {
	233	.driver = {
	234	.name = "tps65218-gpio",
	235	.of_match_table = of_match_ptr(tps65218_dt_match)
	236	},
	237	.probe = tps65218_gpio_probe,
a944a892	238	.id_table = tps65218_gpio_id_table,
c366c76a NSJ	239	};
	240
	241	module_platform_driver(tps65218_gpio_driver);
	242
	243	MODULE_AUTHOR("Nicolas Saenz Julienne <[email protected]>");
	244	MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
	245	MODULE_LICENSE("GPL v2");
	246	MODULE_ALIAS("platform:tps65218-gpio");