[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/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 = tps65218_reg_read(tps65218, 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_single_ended(struct gpio_chip *gc,
					  unsigned offset,
					  enum single_ended_mode mode)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;

	switch (offset) {
	case 0:
	case 2:
		/* GPO1 is hardwired to be open drain */
		if (mode == LINE_MODE_OPEN_DRAIN)
			return 0;
		return -ENOTSUPP;
	case 1:
		/* GPO2 is push-pull by default, can be set as open drain. */
		if (mode == LINE_MODE_OPEN_DRAIN)
			return tps65218_clear_bits(tps65218,
						   TPS65218_REG_CONFIG1,
						   TPS65218_CONFIG1_GPO2_BUF,
						   TPS65218_PROTECT_L1);
		if (mode == LINE_MODE_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 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_single_ended	= tps65218_gpio_set_single_ended,
	.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 = gpiochip_add_data(&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 int tps65218_gpio_remove(struct platform_device *pdev)
{
	struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);

	gpiochip_remove(&tps65218_gpio->gpio_chip);

	return 0;
}

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

static struct platform_driver tps65218_gpio_driver = {
	.driver = {
		.name = "tps65218-gpio",
		.of_match_table = of_match_ptr(tps65218_dt_match)
	},
	.probe = tps65218_gpio_probe,
	.remove = tps65218_gpio_remove,
};

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>
	19	#include <linux/mfd/tps65218.h>
c366c76a NSJ	20
	21	struct tps65218_gpio {
	22	struct tps65218 *tps65218;
	23	struct gpio_chip gpio_chip;
	24	};
	25
	26	static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
	27	{
	28	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	29	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	30	unsigned int val;
	31	int ret;
	32
	33	ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
	34	if (ret)
	35	return ret;
	36
	37	return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
	38	}
	39
	40	static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
	41	int value)
	42	{
	43	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	44	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	45
	46	if (value)
	47	tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
	48	TPS65218_ENABLE2_GPIO1 << offset,
	49	TPS65218_ENABLE2_GPIO1 << offset,
	50	TPS65218_PROTECT_L1);
	51	else
	52	tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
	53	TPS65218_ENABLE2_GPIO1 << offset,
	54	TPS65218_PROTECT_L1);
	55	}
	56
	57	static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
	58	int value)
	59	{
	60	/* Only drives GPOs */
818cc6a5	61	tps65218_gpio_set(gc, offset, value);
c366c76a NSJ	62	return 0;
	63	}
	64
	65	static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
	66	{
	67	return -EPERM;
	68	}
	69
	70	static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
	71	{
	72	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	73	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
c366c76a NSJ	74	int ret;
c366c76a NSJ	75
143b65d6	76	if (gpiochip_line_is_open_source(gc, offset)) {
c366c76a NSJ	77	dev_err(gc->parent, "can't work as open source\n");
	78	return -EINVAL;
	79	}
	80
	81	switch (offset) {
	82	case 0:
143b65d6	83	if (!gpiochip_line_is_open_drain(gc, offset)) {
c366c76a NSJ	84	dev_err(gc->parent, "GPO1 works only as open drain\n");
	85	return -EINVAL;
	86	}
	87
	88	/* Disable sequencer for GPO1 */
	89	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
	90	TPS65218_SEQ7_GPO1_SEQ_MASK,
	91	TPS65218_PROTECT_L1);
	92	if (ret)
	93	return ret;
	94
	95	/* Setup GPO1 */
	96	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
	97	TPS65218_CONFIG1_IO1_SEL,
	98	TPS65218_PROTECT_L1);
	99	if (ret)
	100	return ret;
	101
	102	break;
	103	case 1:
c366c76a NSJ	104	/* Setup GPO2 */
	105	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
	106	TPS65218_CONFIG1_IO1_SEL,
	107	TPS65218_PROTECT_L1);
	108	if (ret)
	109	return ret;
	110
	111	break;
	112
	113	case 2:
143b65d6	114	if (!gpiochip_line_is_open_drain(gc, offset)) {
c366c76a NSJ	115	dev_err(gc->parent, "GPO3 works only as open drain\n");
	116	return -EINVAL;
	117	}
	118
	119	/* Disable sequencer for GPO3 */
	120	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
	121	TPS65218_SEQ7_GPO3_SEQ_MASK,
	122	TPS65218_PROTECT_L1);
	123	if (ret)
	124	return ret;
	125
	126	/* Setup GPO3 */
	127	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
	128	TPS65218_CONFIG2_DC12_RST,
	129	TPS65218_PROTECT_L1);
	130	if (ret)
	131	return ret;
	132
	133	break;
	134	default:
	135	return -EINVAL;
	136	}
	137
	138	return 0;
	139	}
	140
f30e49f1 LW	141	static int tps65218_gpio_set_single_ended(struct gpio_chip *gc,
	142	unsigned offset,
	143	enum single_ended_mode mode)
	144	{
	145	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	146	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	147
	148	switch (offset) {
	149	case 0:
	150	case 2:
	151	/* GPO1 is hardwired to be open drain */
	152	if (mode == LINE_MODE_OPEN_DRAIN)
	153	return 0;
	154	return -ENOTSUPP;
	155	case 1:
	156	/* GPO2 is push-pull by default, can be set as open drain. */
	157	if (mode == LINE_MODE_OPEN_DRAIN)
	158	return tps65218_clear_bits(tps65218,
	159	TPS65218_REG_CONFIG1,
	160	TPS65218_CONFIG1_GPO2_BUF,
	161	TPS65218_PROTECT_L1);
	162	if (mode == LINE_MODE_PUSH_PULL)
	163	return tps65218_set_bits(tps65218,
	164	TPS65218_REG_CONFIG1,
	165	TPS65218_CONFIG1_GPO2_BUF,
	166	TPS65218_CONFIG1_GPO2_BUF,
	167	TPS65218_PROTECT_L1);
	168	return -ENOTSUPP;
	169	default:
	170	break;
	171	}
	172	return -ENOTSUPP;
	173	}
	174
c366c76a NSJ	175	static struct gpio_chip template_chip = {
	176	.label = "gpio-tps65218",
	177	.owner = THIS_MODULE,
	178	.request = tps65218_gpio_request,
	179	.direction_output = tps65218_gpio_output,
	180	.direction_input = tps65218_gpio_input,
	181	.get = tps65218_gpio_get,
	182	.set = tps65218_gpio_set,
f30e49f1	183	.set_single_ended = tps65218_gpio_set_single_ended,
c366c76a NSJ	184	.can_sleep = true,
	185	.ngpio = 3,
	186	.base = -1,
	187	};
	188
	189	static int tps65218_gpio_probe(struct platform_device *pdev)
	190	{
	191	struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
	192	struct tps65218_gpio *tps65218_gpio;
	193	int ret;
	194
	195	tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
	196	GFP_KERNEL);
	197	if (!tps65218_gpio)
	198	return -ENOMEM;
	199
	200	tps65218_gpio->tps65218 = tps65218;
	201	tps65218_gpio->gpio_chip = template_chip;
	202	tps65218_gpio->gpio_chip.parent = &pdev->dev;
	203	#ifdef CONFIG_OF_GPIO
	204	tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
	205	#endif
	206
	207	ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
	208	if (ret < 0) {
	209	dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
	210	return ret;
	211	}
	212
	213	platform_set_drvdata(pdev, tps65218_gpio);
	214
	215	return ret;
	216	}
	217
	218	static int tps65218_gpio_remove(struct platform_device *pdev)
	219	{
	220	struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
	221
	222	gpiochip_remove(&tps65218_gpio->gpio_chip);
	223
	224	return 0;
	225	}
	226
	227	static const struct of_device_id tps65218_dt_match[] = {
	228	{ .compatible = "ti,tps65218-gpio" },
	229	{ }
	230	};
	231	MODULE_DEVICE_TABLE(of, tps65218_dt_match);
	232
	233	static struct platform_driver tps65218_gpio_driver = {
	234	.driver = {
	235	.name = "tps65218-gpio",
	236	.of_match_table = of_match_ptr(tps65218_dt_match)
	237	},
	238	.probe = tps65218_gpio_probe,
	239	.remove = tps65218_gpio_remove,
	240	};
	241
	242	module_platform_driver(tps65218_gpio_driver);
	243
	244	MODULE_AUTHOR("Nicolas Saenz Julienne <[email protected]>");
	245	MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
	246	MODULE_LICENSE("GPL v2");
	247	MODULE_ALIAS("platform:tps65218-gpio");