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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2015 Verifone Int.
 *
 * Author: Nicolas Saenz Julienne <[email protected]>
 *
 * 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;

	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;

	return devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
				      tps65218_gpio);
}

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 = 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");
Commit	Line	Data
fe963fd8	1	// SPDX-License-Identifier: GPL-2.0-or-later
c366c76a NSJ	2	/*
	3	* Copyright 2015 Verifone Int.
	4	*
	5	* Author: Nicolas Saenz Julienne <[email protected]>
	6	*
c366c76a NSJ	7	* This driver is based on the gpio-tps65912 implementation.
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/errno.h>
	13	#include <linux/gpio/driver.h>
	14	#include <linux/platform_device.h>
0aced355	15	#include <linux/regmap.h>
c366c76a	16	#include <linux/mfd/tps65218.h>
c366c76a NSJ	17
	18	struct tps65218_gpio {
	19	struct tps65218 *tps65218;
	20	struct gpio_chip gpio_chip;
	21	};
	22
	23	static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
	24	{
	25	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	26	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	27	unsigned int val;
	28	int ret;
	29
0aced355	30	ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val);
c366c76a NSJ	31	if (ret)
	32	return ret;
	33
	34	return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
	35	}
	36
	37	static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
	38	int value)
	39	{
	40	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	41	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	42
	43	if (value)
	44	tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
	45	TPS65218_ENABLE2_GPIO1 << offset,
	46	TPS65218_ENABLE2_GPIO1 << offset,
	47	TPS65218_PROTECT_L1);
	48	else
	49	tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
	50	TPS65218_ENABLE2_GPIO1 << offset,
	51	TPS65218_PROTECT_L1);
	52	}
	53
	54	static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
	55	int value)
	56	{
	57	/* Only drives GPOs */
818cc6a5	58	tps65218_gpio_set(gc, offset, value);
c366c76a NSJ	59	return 0;
	60	}
	61
	62	static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
	63	{
	64	return -EPERM;
	65	}
	66
	67	static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
	68	{
	69	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	70	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
c366c76a NSJ	71	int ret;
c366c76a NSJ	72
143b65d6	73	if (gpiochip_line_is_open_source(gc, offset)) {
c366c76a NSJ	74	dev_err(gc->parent, "can't work as open source\n");
	75	return -EINVAL;
	76	}
	77
	78	switch (offset) {
	79	case 0:
143b65d6	80	if (!gpiochip_line_is_open_drain(gc, offset)) {
c366c76a NSJ	81	dev_err(gc->parent, "GPO1 works only as open drain\n");
	82	return -EINVAL;
	83	}
	84
	85	/* Disable sequencer for GPO1 */
	86	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
	87	TPS65218_SEQ7_GPO1_SEQ_MASK,
	88	TPS65218_PROTECT_L1);
	89	if (ret)
	90	return ret;
	91
	92	/* Setup GPO1 */
	93	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
	94	TPS65218_CONFIG1_IO1_SEL,
	95	TPS65218_PROTECT_L1);
	96	if (ret)
	97	return ret;
	98
	99	break;
	100	case 1:
c366c76a NSJ	101	/* Setup GPO2 */
	102	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
	103	TPS65218_CONFIG1_IO1_SEL,
	104	TPS65218_PROTECT_L1);
	105	if (ret)
	106	return ret;
	107
	108	break;
	109
	110	case 2:
143b65d6	111	if (!gpiochip_line_is_open_drain(gc, offset)) {
c366c76a NSJ	112	dev_err(gc->parent, "GPO3 works only as open drain\n");
	113	return -EINVAL;
	114	}
	115
	116	/* Disable sequencer for GPO3 */
	117	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
	118	TPS65218_SEQ7_GPO3_SEQ_MASK,
	119	TPS65218_PROTECT_L1);
	120	if (ret)
	121	return ret;
	122
	123	/* Setup GPO3 */
	124	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
	125	TPS65218_CONFIG2_DC12_RST,
	126	TPS65218_PROTECT_L1);
	127	if (ret)
	128	return ret;
	129
	130	break;
	131	default:
	132	return -EINVAL;
	133	}
	134
	135	return 0;
	136	}
	137
2956b5d9 MW	138	static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset,
2956b5d9 MW	139	unsigned long config)
f30e49f1 LW	140	{
	141	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	142	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
2956b5d9	143	enum pin_config_param param = pinconf_to_config_param(config);
f30e49f1 LW	144
	145	switch (offset) {
	146	case 0:
	147	case 2:
	148	/* GPO1 is hardwired to be open drain */
2956b5d9	149	if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
f30e49f1 LW	150	return 0;
	151	return -ENOTSUPP;
	152	case 1:
	153	/* GPO2 is push-pull by default, can be set as open drain. */
2956b5d9	154	if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
f30e49f1 LW	155	return tps65218_clear_bits(tps65218,
	156	TPS65218_REG_CONFIG1,
	157	TPS65218_CONFIG1_GPO2_BUF,
	158	TPS65218_PROTECT_L1);
2956b5d9	159	if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
f30e49f1 LW	160	return tps65218_set_bits(tps65218,
	161	TPS65218_REG_CONFIG1,
	162	TPS65218_CONFIG1_GPO2_BUF,
	163	TPS65218_CONFIG1_GPO2_BUF,
	164	TPS65218_PROTECT_L1);
	165	return -ENOTSUPP;
	166	default:
	167	break;
	168	}
	169	return -ENOTSUPP;
	170	}
	171
e35b5ab0	172	static const struct gpio_chip template_chip = {
c366c76a NSJ	173	.label = "gpio-tps65218",
	174	.owner = THIS_MODULE,
	175	.request = tps65218_gpio_request,
	176	.direction_output = tps65218_gpio_output,
	177	.direction_input = tps65218_gpio_input,
	178	.get = tps65218_gpio_get,
	179	.set = tps65218_gpio_set,
2956b5d9	180	.set_config = tps65218_gpio_set_config,
c366c76a NSJ	181	.can_sleep = true,
	182	.ngpio = 3,
	183	.base = -1,
	184	};
	185
	186	static int tps65218_gpio_probe(struct platform_device *pdev)
	187	{
	188	struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
	189	struct tps65218_gpio *tps65218_gpio;
c366c76a NSJ	190
	191	tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
	192	GFP_KERNEL);
	193	if (!tps65218_gpio)
	194	return -ENOMEM;
	195
	196	tps65218_gpio->tps65218 = tps65218;
	197	tps65218_gpio->gpio_chip = template_chip;
	198	tps65218_gpio->gpio_chip.parent = &pdev->dev;
c366c76a	199
0cef30b8 AA	200	return devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
0cef30b8 AA	201	tps65218_gpio);
c366c76a NSJ	202	}
c366c76a NSJ	203
c366c76a NSJ	204	static const struct of_device_id tps65218_dt_match[] = {
	205	{ .compatible = "ti,tps65218-gpio" },
	206	{ }
	207	};
	208	MODULE_DEVICE_TABLE(of, tps65218_dt_match);
	209
a944a892 K	210	static const struct platform_device_id tps65218_gpio_id_table[] = {
	211	{ "tps65218-gpio", },
	212	{ /* sentinel */ }
	213	};
	214	MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);
	215
c366c76a NSJ	216	static struct platform_driver tps65218_gpio_driver = {
	217	.driver = {
	218	.name = "tps65218-gpio",
c4dc167c	219	.of_match_table = tps65218_dt_match,
c366c76a NSJ	220	},
c366c76a NSJ	221	.probe = tps65218_gpio_probe,
a944a892	222	.id_table = tps65218_gpio_id_table,
c366c76a NSJ	223	};
	224
	225	module_platform_driver(tps65218_gpio_driver);
	226
	227	MODULE_AUTHOR("Nicolas Saenz Julienne <[email protected]>");
	228	MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
	229	MODULE_LICENSE("GPL v2");