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31ba56f2 MB |
1 | /* |
2 | * gpiolib support for Wolfson Arizona class devices | |
3 | * | |
4 | * Copyright 2012 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/module.h> | |
2e21ec4c | 18 | #include <linux/gpio/driver.h> |
31ba56f2 | 19 | #include <linux/platform_device.h> |
11598d17 | 20 | #include <linux/pm_runtime.h> |
31ba56f2 MB |
21 | #include <linux/seq_file.h> |
22 | ||
23 | #include <linux/mfd/arizona/core.h> | |
24 | #include <linux/mfd/arizona/pdata.h> | |
25 | #include <linux/mfd/arizona/registers.h> | |
26 | ||
27 | struct arizona_gpio { | |
28 | struct arizona *arizona; | |
29 | struct gpio_chip gpio_chip; | |
30 | }; | |
31 | ||
31ba56f2 MB |
32 | static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
33 | { | |
18992d4e | 34 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 35 | struct arizona *arizona = arizona_gpio->arizona; |
27a49ed1 CK |
36 | bool persistent = gpiochip_line_is_persistent(chip, offset); |
37 | bool change; | |
38 | int ret; | |
31ba56f2 | 39 | |
27a49ed1 CK |
40 | ret = regmap_update_bits_check(arizona->regmap, |
41 | ARIZONA_GPIO1_CTRL + offset, | |
42 | ARIZONA_GPN_DIR, ARIZONA_GPN_DIR, | |
43 | &change); | |
44 | if (ret < 0) | |
45 | return ret; | |
46 | ||
47 | if (change && persistent) { | |
48 | pm_runtime_mark_last_busy(chip->parent); | |
49 | pm_runtime_put_autosuspend(chip->parent); | |
50 | } | |
51 | ||
52 | return 0; | |
31ba56f2 MB |
53 | } |
54 | ||
55 | static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset) | |
56 | { | |
18992d4e | 57 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 58 | struct arizona *arizona = arizona_gpio->arizona; |
11598d17 | 59 | unsigned int reg, val; |
31ba56f2 MB |
60 | int ret; |
61 | ||
11598d17 CK |
62 | reg = ARIZONA_GPIO1_CTRL + offset; |
63 | ret = regmap_read(arizona->regmap, reg, &val); | |
31ba56f2 MB |
64 | if (ret < 0) |
65 | return ret; | |
66 | ||
11598d17 | 67 | /* Resume to read actual registers for input pins */ |
64c6a711 | 68 | if (val & ARIZONA_GPN_DIR) { |
11598d17 CK |
69 | ret = pm_runtime_get_sync(chip->parent); |
70 | if (ret < 0) { | |
71 | dev_err(chip->parent, "Failed to resume: %d\n", ret); | |
72 | return ret; | |
73 | } | |
74 | ||
75 | /* Register is cached, drop it to ensure a physical read */ | |
76 | ret = regcache_drop_region(arizona->regmap, reg, reg); | |
77 | if (ret < 0) { | |
78 | dev_err(chip->parent, "Failed to drop cache: %d\n", | |
79 | ret); | |
80 | return ret; | |
81 | } | |
82 | ||
83 | ret = regmap_read(arizona->regmap, reg, &val); | |
84 | if (ret < 0) | |
85 | return ret; | |
86 | ||
87 | pm_runtime_mark_last_busy(chip->parent); | |
88 | pm_runtime_put_autosuspend(chip->parent); | |
89 | } | |
90 | ||
31ba56f2 MB |
91 | if (val & ARIZONA_GPN_LVL) |
92 | return 1; | |
93 | else | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static int arizona_gpio_direction_out(struct gpio_chip *chip, | |
98 | unsigned offset, int value) | |
99 | { | |
18992d4e | 100 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 101 | struct arizona *arizona = arizona_gpio->arizona; |
27a49ed1 CK |
102 | bool persistent = gpiochip_line_is_persistent(chip, offset); |
103 | unsigned int val; | |
104 | int ret; | |
105 | ||
106 | ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val); | |
107 | if (ret < 0) | |
108 | return ret; | |
109 | ||
110 | if ((val & ARIZONA_GPN_DIR) && persistent) { | |
111 | ret = pm_runtime_get_sync(chip->parent); | |
112 | if (ret < 0) { | |
113 | dev_err(chip->parent, "Failed to resume: %d\n", ret); | |
114 | return ret; | |
115 | } | |
116 | } | |
31ba56f2 MB |
117 | |
118 | if (value) | |
119 | value = ARIZONA_GPN_LVL; | |
120 | ||
121 | return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, | |
122 | ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value); | |
123 | } | |
124 | ||
125 | static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
126 | { | |
18992d4e | 127 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 MB |
128 | struct arizona *arizona = arizona_gpio->arizona; |
129 | ||
130 | if (value) | |
131 | value = ARIZONA_GPN_LVL; | |
132 | ||
133 | regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, | |
134 | ARIZONA_GPN_LVL, value); | |
135 | } | |
136 | ||
e35b5ab0 | 137 | static const struct gpio_chip template_chip = { |
31ba56f2 MB |
138 | .label = "arizona", |
139 | .owner = THIS_MODULE, | |
140 | .direction_input = arizona_gpio_direction_in, | |
141 | .get = arizona_gpio_get, | |
142 | .direction_output = arizona_gpio_direction_out, | |
143 | .set = arizona_gpio_set, | |
9fb1f39e | 144 | .can_sleep = true, |
31ba56f2 MB |
145 | }; |
146 | ||
3836309d | 147 | static int arizona_gpio_probe(struct platform_device *pdev) |
31ba56f2 MB |
148 | { |
149 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 150 | struct arizona_pdata *pdata = dev_get_platdata(arizona->dev); |
31ba56f2 MB |
151 | struct arizona_gpio *arizona_gpio; |
152 | int ret; | |
153 | ||
154 | arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio), | |
155 | GFP_KERNEL); | |
afeb7b45 | 156 | if (!arizona_gpio) |
31ba56f2 MB |
157 | return -ENOMEM; |
158 | ||
159 | arizona_gpio->arizona = arizona; | |
160 | arizona_gpio->gpio_chip = template_chip; | |
58383c78 | 161 | arizona_gpio->gpio_chip.parent = &pdev->dev; |
4bbd6f2e CK |
162 | #ifdef CONFIG_OF_GPIO |
163 | arizona_gpio->gpio_chip.of_node = arizona->dev->of_node; | |
164 | #endif | |
31ba56f2 MB |
165 | |
166 | switch (arizona->type) { | |
167 | case WM5102: | |
168 | case WM5110: | |
449c175e | 169 | case WM8280: |
d9cadcc9 | 170 | case WM8997: |
633a5065 RF |
171 | case WM8998: |
172 | case WM1814: | |
31ba56f2 MB |
173 | arizona_gpio->gpio_chip.ngpio = 5; |
174 | break; | |
7d07d15a RF |
175 | case WM1831: |
176 | case CS47L24: | |
177 | arizona_gpio->gpio_chip.ngpio = 2; | |
178 | break; | |
31ba56f2 MB |
179 | default: |
180 | dev_err(&pdev->dev, "Unknown chip variant %d\n", | |
181 | arizona->type); | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | if (pdata && pdata->gpio_base) | |
186 | arizona_gpio->gpio_chip.base = pdata->gpio_base; | |
187 | else | |
188 | arizona_gpio->gpio_chip.base = -1; | |
189 | ||
27a49ed1 CK |
190 | pm_runtime_enable(&pdev->dev); |
191 | ||
db303a90 LD |
192 | ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip, |
193 | arizona_gpio); | |
31ba56f2 MB |
194 | if (ret < 0) { |
195 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
196 | ret); | |
975acebb | 197 | return ret; |
31ba56f2 MB |
198 | } |
199 | ||
975acebb | 200 | return 0; |
31ba56f2 MB |
201 | } |
202 | ||
31ba56f2 MB |
203 | static struct platform_driver arizona_gpio_driver = { |
204 | .driver.name = "arizona-gpio", | |
31ba56f2 | 205 | .probe = arizona_gpio_probe, |
31ba56f2 MB |
206 | }; |
207 | ||
208 | module_platform_driver(arizona_gpio_driver); | |
209 | ||
210 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
211 | MODULE_DESCRIPTION("GPIO interface for Arizona devices"); | |
212 | MODULE_LICENSE("GPL"); | |
213 | MODULE_ALIAS("platform:arizona-gpio"); |