Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
31ba56f2 MB |
2 | /* |
3 | * gpiolib support for Wolfson Arizona class devices | |
4 | * | |
5 | * Copyright 2012 Wolfson Microelectronics PLC. | |
6 | * | |
7 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
31ba56f2 MB |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/module.h> | |
2e21ec4c | 13 | #include <linux/gpio/driver.h> |
31ba56f2 | 14 | #include <linux/platform_device.h> |
11598d17 | 15 | #include <linux/pm_runtime.h> |
31ba56f2 MB |
16 | #include <linux/seq_file.h> |
17 | ||
18 | #include <linux/mfd/arizona/core.h> | |
19 | #include <linux/mfd/arizona/pdata.h> | |
20 | #include <linux/mfd/arizona/registers.h> | |
21 | ||
22 | struct arizona_gpio { | |
23 | struct arizona *arizona; | |
24 | struct gpio_chip gpio_chip; | |
25 | }; | |
26 | ||
31ba56f2 MB |
27 | static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
28 | { | |
18992d4e | 29 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 30 | struct arizona *arizona = arizona_gpio->arizona; |
27a49ed1 CK |
31 | bool persistent = gpiochip_line_is_persistent(chip, offset); |
32 | bool change; | |
33 | int ret; | |
31ba56f2 | 34 | |
27a49ed1 CK |
35 | ret = regmap_update_bits_check(arizona->regmap, |
36 | ARIZONA_GPIO1_CTRL + offset, | |
37 | ARIZONA_GPN_DIR, ARIZONA_GPN_DIR, | |
38 | &change); | |
39 | if (ret < 0) | |
40 | return ret; | |
41 | ||
42 | if (change && persistent) { | |
43 | pm_runtime_mark_last_busy(chip->parent); | |
44 | pm_runtime_put_autosuspend(chip->parent); | |
45 | } | |
46 | ||
47 | return 0; | |
31ba56f2 MB |
48 | } |
49 | ||
50 | static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset) | |
51 | { | |
18992d4e | 52 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 53 | struct arizona *arizona = arizona_gpio->arizona; |
11598d17 | 54 | unsigned int reg, val; |
31ba56f2 MB |
55 | int ret; |
56 | ||
11598d17 CK |
57 | reg = ARIZONA_GPIO1_CTRL + offset; |
58 | ret = regmap_read(arizona->regmap, reg, &val); | |
31ba56f2 MB |
59 | if (ret < 0) |
60 | return ret; | |
61 | ||
11598d17 | 62 | /* Resume to read actual registers for input pins */ |
64c6a711 | 63 | if (val & ARIZONA_GPN_DIR) { |
11598d17 CK |
64 | ret = pm_runtime_get_sync(chip->parent); |
65 | if (ret < 0) { | |
66 | dev_err(chip->parent, "Failed to resume: %d\n", ret); | |
67 | return ret; | |
68 | } | |
69 | ||
70 | /* Register is cached, drop it to ensure a physical read */ | |
71 | ret = regcache_drop_region(arizona->regmap, reg, reg); | |
72 | if (ret < 0) { | |
73 | dev_err(chip->parent, "Failed to drop cache: %d\n", | |
74 | ret); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | ret = regmap_read(arizona->regmap, reg, &val); | |
79 | if (ret < 0) | |
80 | return ret; | |
81 | ||
82 | pm_runtime_mark_last_busy(chip->parent); | |
83 | pm_runtime_put_autosuspend(chip->parent); | |
84 | } | |
85 | ||
31ba56f2 MB |
86 | if (val & ARIZONA_GPN_LVL) |
87 | return 1; | |
88 | else | |
89 | return 0; | |
90 | } | |
91 | ||
92 | static int arizona_gpio_direction_out(struct gpio_chip *chip, | |
93 | unsigned offset, int value) | |
94 | { | |
18992d4e | 95 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 96 | struct arizona *arizona = arizona_gpio->arizona; |
27a49ed1 CK |
97 | bool persistent = gpiochip_line_is_persistent(chip, offset); |
98 | unsigned int val; | |
99 | int ret; | |
100 | ||
101 | ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | ||
105 | if ((val & ARIZONA_GPN_DIR) && persistent) { | |
106 | ret = pm_runtime_get_sync(chip->parent); | |
107 | if (ret < 0) { | |
108 | dev_err(chip->parent, "Failed to resume: %d\n", ret); | |
109 | return ret; | |
110 | } | |
111 | } | |
31ba56f2 MB |
112 | |
113 | if (value) | |
114 | value = ARIZONA_GPN_LVL; | |
115 | ||
116 | return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, | |
117 | ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value); | |
118 | } | |
119 | ||
120 | static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
121 | { | |
18992d4e | 122 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 MB |
123 | struct arizona *arizona = arizona_gpio->arizona; |
124 | ||
125 | if (value) | |
126 | value = ARIZONA_GPN_LVL; | |
127 | ||
128 | regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, | |
129 | ARIZONA_GPN_LVL, value); | |
130 | } | |
131 | ||
e35b5ab0 | 132 | static const struct gpio_chip template_chip = { |
31ba56f2 MB |
133 | .label = "arizona", |
134 | .owner = THIS_MODULE, | |
135 | .direction_input = arizona_gpio_direction_in, | |
136 | .get = arizona_gpio_get, | |
137 | .direction_output = arizona_gpio_direction_out, | |
138 | .set = arizona_gpio_set, | |
9fb1f39e | 139 | .can_sleep = true, |
31ba56f2 MB |
140 | }; |
141 | ||
3836309d | 142 | static int arizona_gpio_probe(struct platform_device *pdev) |
31ba56f2 MB |
143 | { |
144 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); | |
72ce665f | 145 | struct arizona_pdata *pdata = &arizona->pdata; |
31ba56f2 MB |
146 | struct arizona_gpio *arizona_gpio; |
147 | int ret; | |
148 | ||
149 | arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio), | |
150 | GFP_KERNEL); | |
afeb7b45 | 151 | if (!arizona_gpio) |
31ba56f2 MB |
152 | return -ENOMEM; |
153 | ||
154 | arizona_gpio->arizona = arizona; | |
155 | arizona_gpio->gpio_chip = template_chip; | |
58383c78 | 156 | arizona_gpio->gpio_chip.parent = &pdev->dev; |
4bbd6f2e CK |
157 | #ifdef CONFIG_OF_GPIO |
158 | arizona_gpio->gpio_chip.of_node = arizona->dev->of_node; | |
159 | #endif | |
31ba56f2 MB |
160 | |
161 | switch (arizona->type) { | |
162 | case WM5102: | |
163 | case WM5110: | |
449c175e | 164 | case WM8280: |
d9cadcc9 | 165 | case WM8997: |
633a5065 RF |
166 | case WM8998: |
167 | case WM1814: | |
31ba56f2 MB |
168 | arizona_gpio->gpio_chip.ngpio = 5; |
169 | break; | |
7d07d15a RF |
170 | case WM1831: |
171 | case CS47L24: | |
172 | arizona_gpio->gpio_chip.ngpio = 2; | |
173 | break; | |
31ba56f2 MB |
174 | default: |
175 | dev_err(&pdev->dev, "Unknown chip variant %d\n", | |
176 | arizona->type); | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
72ce665f | 180 | if (pdata->gpio_base) |
31ba56f2 MB |
181 | arizona_gpio->gpio_chip.base = pdata->gpio_base; |
182 | else | |
183 | arizona_gpio->gpio_chip.base = -1; | |
184 | ||
27a49ed1 CK |
185 | pm_runtime_enable(&pdev->dev); |
186 | ||
db303a90 LD |
187 | ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip, |
188 | arizona_gpio); | |
31ba56f2 MB |
189 | if (ret < 0) { |
190 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
191 | ret); | |
975acebb | 192 | return ret; |
31ba56f2 MB |
193 | } |
194 | ||
975acebb | 195 | return 0; |
31ba56f2 MB |
196 | } |
197 | ||
31ba56f2 MB |
198 | static struct platform_driver arizona_gpio_driver = { |
199 | .driver.name = "arizona-gpio", | |
31ba56f2 | 200 | .probe = arizona_gpio_probe, |
31ba56f2 MB |
201 | }; |
202 | ||
203 | module_platform_driver(arizona_gpio_driver); | |
204 | ||
205 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
206 | MODULE_DESCRIPTION("GPIO interface for Arizona devices"); | |
207 | MODULE_LICENSE("GPL"); | |
208 | MODULE_ALIAS("platform:arizona-gpio"); |