Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 int 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 return regmap_update_bits(regmap, reg, BIT(offset),
86 value ? BIT(offset) : 0);
87}
88
89static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
90 int value)
91{
92 struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
93 struct regmap *regmap = tps68470_gpio->tps68470_regmap;
94 int ret;
95
96 /* Set the initial value */
97 ret = tps68470_gpio_set(gc, offset, value);
98 if (ret)
99 return ret;
100
101 /* rest are always outputs */
102 if (offset >= TPS68470_N_REGULAR_GPIO)
103 return 0;
104
105 return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
106 TPS68470_GPIO_MODE_MASK,
107 TPS68470_GPIO_MODE_OUT_CMOS);
108}
109
110static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
111{
112 struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
113 struct regmap *regmap = tps68470_gpio->tps68470_regmap;
114
115 /* rest are always outputs */
116 if (offset >= TPS68470_N_REGULAR_GPIO)
117 return -EINVAL;
118
119 return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
120 TPS68470_GPIO_MODE_MASK, 0x00);
121}
122
123static int tps68470_enable_i2c_daisy_chain(struct gpio_chip *gc)
124{
125 int ret;
126
127 ret = tps68470_gpio_input(gc, 1);
128 if (ret)
129 return ret;
130
131 return tps68470_gpio_input(gc, 2);
132}
133
134static const char *tps68470_names[TPS68470_N_GPIO] = {
135 "gpio.0", "gpio.1", "gpio.2", "gpio.3",
136 "gpio.4", "gpio.5", "gpio.6",
137 "s_enable", "s_idle", "s_resetn",
138};
139
140static int tps68470_gpio_probe(struct platform_device *pdev)
141{
142 struct tps68470_gpio_data *tps68470_gpio;
143 int ret;
144
145 tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
146 GFP_KERNEL);
147 if (!tps68470_gpio)
148 return -ENOMEM;
149
150 tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
151 tps68470_gpio->gc.label = "tps68470-gpio";
152 tps68470_gpio->gc.owner = THIS_MODULE;
153 tps68470_gpio->gc.direction_input = tps68470_gpio_input;
154 tps68470_gpio->gc.direction_output = tps68470_gpio_output;
155 tps68470_gpio->gc.get = tps68470_gpio_get;
156 tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
157 tps68470_gpio->gc.set = tps68470_gpio_set;
158 tps68470_gpio->gc.can_sleep = true;
159 tps68470_gpio->gc.names = tps68470_names;
160 tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
161 tps68470_gpio->gc.base = -1;
162 tps68470_gpio->gc.parent = &pdev->dev;
163
164 ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio);
165 if (ret)
166 return ret;
167
168 if (device_property_present(&pdev->dev, "daisy-chain-enable"))
169 ret = tps68470_enable_i2c_daisy_chain(&tps68470_gpio->gc);
170
171 return ret;
172}
173
174static struct platform_driver tps68470_gpio_driver = {
175 .driver = {
176 .name = "tps68470-gpio",
177 },
178 .probe = tps68470_gpio_probe,
179};
180module_platform_driver(tps68470_gpio_driver);
181
182MODULE_ALIAS("platform:tps68470-gpio");
183MODULE_DESCRIPTION("GPIO driver for TPS68470 PMIC");
184MODULE_LICENSE("GPL v2");