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 | |
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(map: regmap, reg, val: &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 | static 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(map: regmap, TPS68470_GPIO_CTL_REG_A(offset), val: &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 | |
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(map: regmap, reg, BIT(offset), val: 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 | /* 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(map: 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(map: regmap, TPS68470_GPIO_CTL_REG_A(offset), |
116 | TPS68470_GPIO_MODE_MASK, val: 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 | |
129 | tps68470_gpio = devm_kzalloc(dev: &pdev->dev, size: sizeof(*tps68470_gpio), |
130 | GFP_KERNEL); |
131 | if (!tps68470_gpio) |
132 | return -ENOMEM; |
133 | |
134 | tps68470_gpio->tps68470_regmap = dev_get_drvdata(dev: 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 | |
151 | static struct platform_driver tps68470_gpio_driver = { |
152 | .driver = { |
153 | .name = "tps68470-gpio" , |
154 | }, |
155 | .probe = tps68470_gpio_probe, |
156 | }; |
157 | module_platform_driver(tps68470_gpio_driver); |
158 | |
159 | MODULE_ALIAS("platform:tps68470-gpio" ); |
160 | MODULE_DESCRIPTION("GPIO driver for TPS68470 PMIC" ); |
161 | MODULE_LICENSE("GPL v2" ); |
162 | |