[linux-2.6-block.git] / drivers / gpio / gpio-tps68470.c

// SPDX-License-Identifier: GPL-2.0
/*
 * GPIO driver for TPS68470 PMIC
 *
 * Copyright (C) 2017 Intel Corporation
 *
 * Authors:
 *	Antti Laakso <antti.laakso@intel.com>
 *	Tianshu Qiu <tian.shu.qiu@intel.com>
 *	Jian Xu Zheng <jian.xu.zheng@intel.com>
 *	Yuning Pu <yuning.pu@intel.com>
 */

#include <linux/gpio/driver.h>
#include <linux/mfd/tps68470.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#define TPS68470_N_LOGIC_OUTPUT	3
#define TPS68470_N_REGULAR_GPIO	7
#define TPS68470_N_GPIO	(TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)

struct tps68470_gpio_data {
	struct regmap *tps68470_regmap;
	struct gpio_chip gc;
};

static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
	unsigned int reg = TPS68470_REG_GPDO;
	int val, ret;

	if (offset >= TPS68470_N_REGULAR_GPIO) {
		offset -= TPS68470_N_REGULAR_GPIO;
		reg = TPS68470_REG_SGPO;
	}

	ret = regmap_read(regmap, reg, &val);
	if (ret) {
		dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
			TPS68470_REG_SGPO);
		return ret;
	}
	return !!(val & BIT(offset));
}

/* Return 0 if output, 1 if input */
static int tps68470_gpio_get_direction(struct gpio_chip *gc,
				       unsigned int offset)
{
	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
	int val, ret;

	/* rest are always outputs */
	if (offset >= TPS68470_N_REGULAR_GPIO)
		return 0;

	ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
	if (ret) {
		dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
			TPS68470_GPIO_CTL_REG_A(offset));
		return ret;
	}

	val &= TPS68470_GPIO_MODE_MASK;
	return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1;
}

static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
				int value)
{
	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
	unsigned int reg = TPS68470_REG_GPDO;

	if (offset >= TPS68470_N_REGULAR_GPIO) {
		reg = TPS68470_REG_SGPO;
		offset -= TPS68470_N_REGULAR_GPIO;
	}

	regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
}

static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
				int value)
{
	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
	struct regmap *regmap = tps68470_gpio->tps68470_regmap;

	/* rest are always outputs */
	if (offset >= TPS68470_N_REGULAR_GPIO)
		return 0;

	/* Set the initial value */
	tps68470_gpio_set(gc, offset, value);

	return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
				 TPS68470_GPIO_MODE_MASK,
				 TPS68470_GPIO_MODE_OUT_CMOS);
}

static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
{
	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
	struct regmap *regmap = tps68470_gpio->tps68470_regmap;

	/* rest are always outputs */
	if (offset >= TPS68470_N_REGULAR_GPIO)
		return -EINVAL;

	return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
				   TPS68470_GPIO_MODE_MASK, 0x00);
}

static const char *tps68470_names[TPS68470_N_GPIO] = {
	"gpio.0", "gpio.1", "gpio.2", "gpio.3",
	"gpio.4", "gpio.5", "gpio.6",
	"s_enable", "s_idle", "s_resetn",
};

static int tps68470_gpio_probe(struct platform_device *pdev)
{
	struct tps68470_gpio_data *tps68470_gpio;
	int ret;

	tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
				     GFP_KERNEL);
	if (!tps68470_gpio)
		return -ENOMEM;

	tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
	tps68470_gpio->gc.label = "tps68470-gpio";
	tps68470_gpio->gc.owner = THIS_MODULE;
	tps68470_gpio->gc.direction_input = tps68470_gpio_input;
	tps68470_gpio->gc.direction_output = tps68470_gpio_output;
	tps68470_gpio->gc.get = tps68470_gpio_get;
	tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
	tps68470_gpio->gc.set = tps68470_gpio_set;
	tps68470_gpio->gc.can_sleep = true;
	tps68470_gpio->gc.names = tps68470_names;
	tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
	tps68470_gpio->gc.base = -1;
	tps68470_gpio->gc.parent = &pdev->dev;

	ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
				     tps68470_gpio);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, tps68470_gpio);

	return ret;
}

static struct platform_driver tps68470_gpio_driver = {
	.driver = {
		   .name = "tps68470-gpio",
	},
	.probe = tps68470_gpio_probe,
};

builtin_platform_driver(tps68470_gpio_driver)
Commit	Line	Data
ca34b4f0	1	// SPDX-License-Identifier: GPL-2.0
275b13a6 RM	2	/*
	3	* GPIO driver for TPS68470 PMIC
	4	*
	5	* Copyright (C) 2017 Intel Corporation
	6	*
	7	* Authors:
	8	* Antti Laakso <antti.laakso@intel.com>
	9	* Tianshu Qiu <tian.shu.qiu@intel.com>
	10	* Jian Xu Zheng <jian.xu.zheng@intel.com>
	11	* Yuning Pu <yuning.pu@intel.com>
275b13a6 RM	12	*/
	13
	14	#include <linux/gpio/driver.h>
	15	#include <linux/mfd/tps68470.h>
	16	#include <linux/module.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/regmap.h>
	19
	20	#define TPS68470_N_LOGIC_OUTPUT 3
	21	#define TPS68470_N_REGULAR_GPIO 7
	22	#define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)
	23
	24	struct tps68470_gpio_data {
	25	struct regmap *tps68470_regmap;
	26	struct gpio_chip gc;
	27	};
	28
	29	static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
	30	{
	31	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
	32	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
	33	unsigned int reg = TPS68470_REG_GPDO;
	34	int val, ret;
	35
	36	if (offset >= TPS68470_N_REGULAR_GPIO) {
	37	offset -= TPS68470_N_REGULAR_GPIO;
	38	reg = TPS68470_REG_SGPO;
	39	}
	40
	41	ret = regmap_read(regmap, reg, &val);
	42	if (ret) {
	43	dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
	44	TPS68470_REG_SGPO);
	45	return ret;
	46	}
	47	return !!(val & BIT(offset));
	48	}
	49
	50	/* Return 0 if output, 1 if input */
	51	static int tps68470_gpio_get_direction(struct gpio_chip *gc,
	52	unsigned int offset)
	53	{
	54	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
	55	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
	56	int val, ret;
	57
	58	/* rest are always outputs */
	59	if (offset >= TPS68470_N_REGULAR_GPIO)
	60	return 0;
	61
	62	ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
	63	if (ret) {
	64	dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
	65	TPS68470_GPIO_CTL_REG_A(offset));
	66	return ret;
	67	}
	68
	69	val &= TPS68470_GPIO_MODE_MASK;
	70	return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1;
	71	}
	72
	73	static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
	74	int value)
	75	{
76	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
77	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
78	unsigned int reg = TPS68470_REG_GPDO;
79
80	if (offset >= TPS68470_N_REGULAR_GPIO) {
81	reg = TPS68470_REG_SGPO;
82	offset -= TPS68470_N_REGULAR_GPIO;
83	}
84
85	regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
86	}
87
88	static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
89	int value)
90	{
91	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
92	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
93
94	/* rest are always outputs */
95	if (offset >= TPS68470_N_REGULAR_GPIO)
96	return 0;
97
98	/* Set the initial value */
99	tps68470_gpio_set(gc, offset, value);
100
101	return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
102	TPS68470_GPIO_MODE_MASK,
103	TPS68470_GPIO_MODE_OUT_CMOS);
104	}
105
106	static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
107	{
108	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
109	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
110
111	/* rest are always outputs */
112	if (offset >= TPS68470_N_REGULAR_GPIO)
113	return -EINVAL;
114
115	return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
116	TPS68470_GPIO_MODE_MASK, 0x00);
117	}
118
119	static const char *tps68470_names[TPS68470_N_GPIO] = {
120	"gpio.0", "gpio.1", "gpio.2", "gpio.3",
121	"gpio.4", "gpio.5", "gpio.6",
122	"s_enable", "s_idle", "s_resetn",
123	};
124
125	static int tps68470_gpio_probe(struct platform_device *pdev)
126	{
127	struct tps68470_gpio_data *tps68470_gpio;
128	int ret;
129
130	tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
131	GFP_KERNEL);
132	if (!tps68470_gpio)
133	return -ENOMEM;
134
135	tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
136	tps68470_gpio->gc.label = "tps68470-gpio";
137	tps68470_gpio->gc.owner = THIS_MODULE;
138	tps68470_gpio->gc.direction_input = tps68470_gpio_input;
139	tps68470_gpio->gc.direction_output = tps68470_gpio_output;
140	tps68470_gpio->gc.get = tps68470_gpio_get;
141	tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
142	tps68470_gpio->gc.set = tps68470_gpio_set;
143	tps68470_gpio->gc.can_sleep = true;
144	tps68470_gpio->gc.names = tps68470_names;
145	tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
146	tps68470_gpio->gc.base = -1;
147	tps68470_gpio->gc.parent = &pdev->dev;
148
149	ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
150	tps68470_gpio);
151	if (ret < 0) {
152	dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
153	return ret;
154	}
155
156	platform_set_drvdata(pdev, tps68470_gpio);
157
158	return ret;
159	}
160
161	static struct platform_driver tps68470_gpio_driver = {
162	.driver = {
163	.name = "tps68470-gpio",
164	},
165	.probe = tps68470_gpio_probe,
166	};
167
168	builtin_platform_driver(tps68470_gpio_driver)