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275b13a6 RM |
1 | /* |
2 | * GPIO driver for TPS68470 PMIC | |
3 | * | |
4 | * Copyright (C) 2017 Intel Corporation | |
5 | * | |
6 | * Authors: | |
7 | * Antti Laakso <antti.laakso@intel.com> | |
8 | * Tianshu Qiu <tian.shu.qiu@intel.com> | |
9 | * Jian Xu Zheng <jian.xu.zheng@intel.com> | |
10 | * Yuning Pu <yuning.pu@intel.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License as | |
14 | * published by the Free Software Foundation version 2. | |
15 | * | |
16 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
17 | * kind, whether express or implied; without even the implied warranty | |
18 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | */ | |
21 | ||
22 | #include <linux/gpio/driver.h> | |
23 | #include <linux/mfd/tps68470.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/regmap.h> | |
27 | ||
28 | #define TPS68470_N_LOGIC_OUTPUT 3 | |
29 | #define TPS68470_N_REGULAR_GPIO 7 | |
30 | #define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO) | |
31 | ||
32 | struct tps68470_gpio_data { | |
33 | struct regmap *tps68470_regmap; | |
34 | struct gpio_chip gc; | |
35 | }; | |
36 | ||
37 | static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset) | |
38 | { | |
39 | struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); | |
40 | struct regmap *regmap = tps68470_gpio->tps68470_regmap; | |
41 | unsigned int reg = TPS68470_REG_GPDO; | |
42 | int val, ret; | |
43 | ||
44 | if (offset >= TPS68470_N_REGULAR_GPIO) { | |
45 | offset -= TPS68470_N_REGULAR_GPIO; | |
46 | reg = TPS68470_REG_SGPO; | |
47 | } | |
48 | ||
49 | ret = regmap_read(regmap, reg, &val); | |
50 | if (ret) { | |
51 | dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", | |
52 | TPS68470_REG_SGPO); | |
53 | return ret; | |
54 | } | |
55 | return !!(val & BIT(offset)); | |
56 | } | |
57 | ||
58 | /* Return 0 if output, 1 if input */ | |
59 | static int tps68470_gpio_get_direction(struct gpio_chip *gc, | |
60 | unsigned int offset) | |
61 | { | |
62 | struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); | |
63 | struct regmap *regmap = tps68470_gpio->tps68470_regmap; | |
64 | int val, ret; | |
65 | ||
66 | /* rest are always outputs */ | |
67 | if (offset >= TPS68470_N_REGULAR_GPIO) | |
68 | return 0; | |
69 | ||
70 | ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val); | |
71 | if (ret) { | |
72 | dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", | |
73 | TPS68470_GPIO_CTL_REG_A(offset)); | |
74 | return ret; | |
75 | } | |
76 | ||
77 | val &= TPS68470_GPIO_MODE_MASK; | |
78 | return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1; | |
79 | } | |
80 | ||
81 | static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset, | |
82 | int value) | |
83 | { | |
84 | struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); | |
85 | struct regmap *regmap = tps68470_gpio->tps68470_regmap; | |
86 | unsigned int reg = TPS68470_REG_GPDO; | |
87 | ||
88 | if (offset >= TPS68470_N_REGULAR_GPIO) { | |
89 | reg = TPS68470_REG_SGPO; | |
90 | offset -= TPS68470_N_REGULAR_GPIO; | |
91 | } | |
92 | ||
93 | regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0); | |
94 | } | |
95 | ||
96 | static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset, | |
97 | int value) | |
98 | { | |
99 | struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); | |
100 | struct regmap *regmap = tps68470_gpio->tps68470_regmap; | |
101 | ||
102 | /* rest are always outputs */ | |
103 | if (offset >= TPS68470_N_REGULAR_GPIO) | |
104 | return 0; | |
105 | ||
106 | /* Set the initial value */ | |
107 | tps68470_gpio_set(gc, offset, value); | |
108 | ||
109 | return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), | |
110 | TPS68470_GPIO_MODE_MASK, | |
111 | TPS68470_GPIO_MODE_OUT_CMOS); | |
112 | } | |
113 | ||
114 | static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset) | |
115 | { | |
116 | struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); | |
117 | struct regmap *regmap = tps68470_gpio->tps68470_regmap; | |
118 | ||
119 | /* rest are always outputs */ | |
120 | if (offset >= TPS68470_N_REGULAR_GPIO) | |
121 | return -EINVAL; | |
122 | ||
123 | return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), | |
124 | TPS68470_GPIO_MODE_MASK, 0x00); | |
125 | } | |
126 | ||
127 | static const char *tps68470_names[TPS68470_N_GPIO] = { | |
128 | "gpio.0", "gpio.1", "gpio.2", "gpio.3", | |
129 | "gpio.4", "gpio.5", "gpio.6", | |
130 | "s_enable", "s_idle", "s_resetn", | |
131 | }; | |
132 | ||
133 | static int tps68470_gpio_probe(struct platform_device *pdev) | |
134 | { | |
135 | struct tps68470_gpio_data *tps68470_gpio; | |
136 | int ret; | |
137 | ||
138 | tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio), | |
139 | GFP_KERNEL); | |
140 | if (!tps68470_gpio) | |
141 | return -ENOMEM; | |
142 | ||
143 | tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent); | |
144 | tps68470_gpio->gc.label = "tps68470-gpio"; | |
145 | tps68470_gpio->gc.owner = THIS_MODULE; | |
146 | tps68470_gpio->gc.direction_input = tps68470_gpio_input; | |
147 | tps68470_gpio->gc.direction_output = tps68470_gpio_output; | |
148 | tps68470_gpio->gc.get = tps68470_gpio_get; | |
149 | tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction; | |
150 | tps68470_gpio->gc.set = tps68470_gpio_set; | |
151 | tps68470_gpio->gc.can_sleep = true; | |
152 | tps68470_gpio->gc.names = tps68470_names; | |
153 | tps68470_gpio->gc.ngpio = TPS68470_N_GPIO; | |
154 | tps68470_gpio->gc.base = -1; | |
155 | tps68470_gpio->gc.parent = &pdev->dev; | |
156 | ||
157 | ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, | |
158 | tps68470_gpio); | |
159 | if (ret < 0) { | |
160 | dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret); | |
161 | return ret; | |
162 | } | |
163 | ||
164 | platform_set_drvdata(pdev, tps68470_gpio); | |
165 | ||
166 | return ret; | |
167 | } | |
168 | ||
169 | static struct platform_driver tps68470_gpio_driver = { | |
170 | .driver = { | |
171 | .name = "tps68470-gpio", | |
172 | }, | |
173 | .probe = tps68470_gpio_probe, | |
174 | }; | |
175 | ||
176 | builtin_platform_driver(tps68470_gpio_driver) |