1// SPDX-License-Identifier: GPL-2.0
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>
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
24struct tps68470_gpio_data {
25	struct regmap *tps68470_regmap;
26	struct gpio_chip gc;
27};
28
29static 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
50static int tps68470_gpio_get_direction(struct gpio_chip *gc,
51				       unsigned int offset)
52{
53	struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
54	struct regmap *regmap = tps68470_gpio->tps68470_regmap;
55	int val, ret;
56
57	/* rest are always outputs */
58	if (offset >= TPS68470_N_REGULAR_GPIO)
59		return GPIO_LINE_DIRECTION_OUT;
60
61	ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
62	if (ret) {
63		dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
64			TPS68470_GPIO_CTL_REG_A(offset));
65		return ret;
66	}
67
68	val &= TPS68470_GPIO_MODE_MASK;
69	return val >= TPS68470_GPIO_MODE_OUT_CMOS ? GPIO_LINE_DIRECTION_OUT :
70						    GPIO_LINE_DIRECTION_IN;
71}
72
73static 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
88static 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	/* Set the initial value */
95	tps68470_gpio_set(gc, offset, value);
96
97	/* rest are always outputs */
98	if (offset >= TPS68470_N_REGULAR_GPIO)
99		return 0;
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
106static 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
119static 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
125static int tps68470_gpio_probe(struct platform_device *pdev)
126{
127	struct tps68470_gpio_data *tps68470_gpio;
128
129	tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
130				     GFP_KERNEL);
131	if (!tps68470_gpio)
132		return -ENOMEM;
133
134	tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
135	tps68470_gpio->gc.label = "tps68470-gpio";
136	tps68470_gpio->gc.owner = THIS_MODULE;
137	tps68470_gpio->gc.direction_input = tps68470_gpio_input;
138	tps68470_gpio->gc.direction_output = tps68470_gpio_output;
139	tps68470_gpio->gc.get = tps68470_gpio_get;
140	tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
141	tps68470_gpio->gc.set = tps68470_gpio_set;
142	tps68470_gpio->gc.can_sleep = true;
143	tps68470_gpio->gc.names = tps68470_names;
144	tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
145	tps68470_gpio->gc.base = -1;
146	tps68470_gpio->gc.parent = &pdev->dev;
147
148	return devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio);
149}
150
151static struct platform_driver tps68470_gpio_driver = {
152	.driver = {
153		   .name = "tps68470-gpio",
154	},
155	.probe = tps68470_gpio_probe,
156};
157module_platform_driver(tps68470_gpio_driver);
158
159MODULE_ALIAS("platform:tps68470-gpio");
160MODULE_DESCRIPTION("GPIO driver for TPS68470 PMIC");
161MODULE_LICENSE("GPL v2");
162