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
50/* Return 0 if output, 1 if input */
51static 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
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 /* 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
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 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
161static struct platform_driver tps68470_gpio_driver = {
162 .driver = {
163 .name = "tps68470-gpio",
164 },
165 .probe = tps68470_gpio_probe,
166};
167
168builtin_platform_driver(tps68470_gpio_driver)
169