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 | ||
c59ce983 | 10 | #include <linux/gpio/driver.h> |
31ba56f2 | 11 | #include <linux/kernel.h> |
31ba56f2 | 12 | #include <linux/module.h> |
31ba56f2 | 13 | #include <linux/platform_device.h> |
11598d17 | 14 | #include <linux/pm_runtime.h> |
c59ce983 | 15 | #include <linux/slab.h> |
31ba56f2 MB |
16 | |
17 | #include <linux/mfd/arizona/core.h> | |
18 | #include <linux/mfd/arizona/pdata.h> | |
19 | #include <linux/mfd/arizona/registers.h> | |
20 | ||
21 | struct arizona_gpio { | |
22 | struct arizona *arizona; | |
23 | struct gpio_chip gpio_chip; | |
24 | }; | |
25 | ||
31ba56f2 MB |
26 | static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
27 | { | |
18992d4e | 28 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 29 | struct arizona *arizona = arizona_gpio->arizona; |
27a49ed1 CK |
30 | bool persistent = gpiochip_line_is_persistent(chip, offset); |
31 | bool change; | |
32 | int ret; | |
31ba56f2 | 33 | |
27a49ed1 CK |
34 | ret = regmap_update_bits_check(arizona->regmap, |
35 | ARIZONA_GPIO1_CTRL + offset, | |
36 | ARIZONA_GPN_DIR, ARIZONA_GPN_DIR, | |
37 | &change); | |
38 | if (ret < 0) | |
39 | return ret; | |
40 | ||
41 | if (change && persistent) { | |
42 | pm_runtime_mark_last_busy(chip->parent); | |
43 | pm_runtime_put_autosuspend(chip->parent); | |
44 | } | |
45 | ||
46 | return 0; | |
31ba56f2 MB |
47 | } |
48 | ||
49 | static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset) | |
50 | { | |
18992d4e | 51 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 52 | struct arizona *arizona = arizona_gpio->arizona; |
11598d17 | 53 | unsigned int reg, val; |
31ba56f2 MB |
54 | int ret; |
55 | ||
11598d17 CK |
56 | reg = ARIZONA_GPIO1_CTRL + offset; |
57 | ret = regmap_read(arizona->regmap, reg, &val); | |
31ba56f2 MB |
58 | if (ret < 0) |
59 | return ret; | |
60 | ||
11598d17 | 61 | /* Resume to read actual registers for input pins */ |
64c6a711 | 62 | if (val & ARIZONA_GPN_DIR) { |
11598d17 CK |
63 | ret = pm_runtime_get_sync(chip->parent); |
64 | if (ret < 0) { | |
65 | dev_err(chip->parent, "Failed to resume: %d\n", ret); | |
861254d8 | 66 | pm_runtime_put_autosuspend(chip->parent); |
11598d17 CK |
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); | |
861254d8 | 75 | pm_runtime_put_autosuspend(chip->parent); |
11598d17 CK |
76 | return ret; |
77 | } | |
78 | ||
79 | ret = regmap_read(arizona->regmap, reg, &val); | |
861254d8 NE |
80 | if (ret < 0) { |
81 | pm_runtime_put_autosuspend(chip->parent); | |
11598d17 | 82 | return ret; |
861254d8 | 83 | } |
11598d17 CK |
84 | |
85 | pm_runtime_mark_last_busy(chip->parent); | |
86 | pm_runtime_put_autosuspend(chip->parent); | |
87 | } | |
88 | ||
31ba56f2 MB |
89 | if (val & ARIZONA_GPN_LVL) |
90 | return 1; | |
91 | else | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static int arizona_gpio_direction_out(struct gpio_chip *chip, | |
96 | unsigned offset, int value) | |
97 | { | |
18992d4e | 98 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 | 99 | struct arizona *arizona = arizona_gpio->arizona; |
27a49ed1 CK |
100 | bool persistent = gpiochip_line_is_persistent(chip, offset); |
101 | unsigned int val; | |
102 | int ret; | |
103 | ||
104 | ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val); | |
105 | if (ret < 0) | |
106 | return ret; | |
107 | ||
108 | if ((val & ARIZONA_GPN_DIR) && persistent) { | |
109 | ret = pm_runtime_get_sync(chip->parent); | |
110 | if (ret < 0) { | |
111 | dev_err(chip->parent, "Failed to resume: %d\n", ret); | |
e6f390a8 | 112 | pm_runtime_put(chip->parent); |
27a49ed1 CK |
113 | return ret; |
114 | } | |
115 | } | |
31ba56f2 MB |
116 | |
117 | if (value) | |
118 | value = ARIZONA_GPN_LVL; | |
119 | ||
120 | return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, | |
121 | ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value); | |
122 | } | |
123 | ||
124 | static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
125 | { | |
18992d4e | 126 | struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip); |
31ba56f2 MB |
127 | struct arizona *arizona = arizona_gpio->arizona; |
128 | ||
129 | if (value) | |
130 | value = ARIZONA_GPN_LVL; | |
131 | ||
132 | regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, | |
133 | ARIZONA_GPN_LVL, value); | |
134 | } | |
135 | ||
e35b5ab0 | 136 | static const struct gpio_chip template_chip = { |
31ba56f2 MB |
137 | .label = "arizona", |
138 | .owner = THIS_MODULE, | |
139 | .direction_input = arizona_gpio_direction_in, | |
140 | .get = arizona_gpio_get, | |
141 | .direction_output = arizona_gpio_direction_out, | |
142 | .set = arizona_gpio_set, | |
9fb1f39e | 143 | .can_sleep = true, |
31ba56f2 MB |
144 | }; |
145 | ||
3836309d | 146 | static int arizona_gpio_probe(struct platform_device *pdev) |
31ba56f2 MB |
147 | { |
148 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); | |
72ce665f | 149 | struct arizona_pdata *pdata = &arizona->pdata; |
31ba56f2 MB |
150 | struct arizona_gpio *arizona_gpio; |
151 | int ret; | |
152 | ||
6dbe6c07 AS |
153 | device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent)); |
154 | ||
31ba56f2 MB |
155 | arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio), |
156 | GFP_KERNEL); | |
afeb7b45 | 157 | if (!arizona_gpio) |
31ba56f2 MB |
158 | return -ENOMEM; |
159 | ||
160 | arizona_gpio->arizona = arizona; | |
161 | arizona_gpio->gpio_chip = template_chip; | |
58383c78 | 162 | arizona_gpio->gpio_chip.parent = &pdev->dev; |
31ba56f2 MB |
163 | |
164 | switch (arizona->type) { | |
165 | case WM5102: | |
166 | case WM5110: | |
449c175e | 167 | case WM8280: |
d9cadcc9 | 168 | case WM8997: |
633a5065 RF |
169 | case WM8998: |
170 | case WM1814: | |
31ba56f2 MB |
171 | arizona_gpio->gpio_chip.ngpio = 5; |
172 | break; | |
7d07d15a RF |
173 | case WM1831: |
174 | case CS47L24: | |
175 | arizona_gpio->gpio_chip.ngpio = 2; | |
176 | break; | |
31ba56f2 MB |
177 | default: |
178 | dev_err(&pdev->dev, "Unknown chip variant %d\n", | |
179 | arizona->type); | |
180 | return -EINVAL; | |
181 | } | |
182 | ||
72ce665f | 183 | if (pdata->gpio_base) |
31ba56f2 MB |
184 | arizona_gpio->gpio_chip.base = pdata->gpio_base; |
185 | else | |
186 | arizona_gpio->gpio_chip.base = -1; | |
187 | ||
27a49ed1 CK |
188 | pm_runtime_enable(&pdev->dev); |
189 | ||
db303a90 LD |
190 | ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip, |
191 | arizona_gpio); | |
31ba56f2 | 192 | if (ret < 0) { |
0ac22098 | 193 | pm_runtime_disable(&pdev->dev); |
31ba56f2 MB |
194 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", |
195 | ret); | |
975acebb | 196 | return ret; |
31ba56f2 MB |
197 | } |
198 | ||
975acebb | 199 | return 0; |
31ba56f2 MB |
200 | } |
201 | ||
31ba56f2 MB |
202 | static struct platform_driver arizona_gpio_driver = { |
203 | .driver.name = "arizona-gpio", | |
31ba56f2 | 204 | .probe = arizona_gpio_probe, |
31ba56f2 MB |
205 | }; |
206 | ||
207 | module_platform_driver(arizona_gpio_driver); | |
208 | ||
209 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
210 | MODULE_DESCRIPTION("GPIO interface for Arizona devices"); | |
211 | MODULE_LICENSE("GPL"); | |
212 | MODULE_ALIAS("platform:arizona-gpio"); |