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gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / drivers / gpio / gpio-arizona.c
blob: ca002739616af3969431482de5a9df6a6e96a975 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame^]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>
18#include <linux/gpio.h>
19#include <linux/platform_device.h>
20#include <linux/seq_file.h>
21
22#include <linux/mfd/arizona/core.h>
23#include <linux/mfd/arizona/pdata.h>
24#include <linux/mfd/arizona/registers.h>
25
26struct arizona_gpio {
27 struct arizona *arizona;
28 struct gpio_chip gpio_chip;
29};
30
31static inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip)
32{
33 return container_of(chip, struct arizona_gpio, gpio_chip);
34}
35
36static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
37{
38 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
39 struct arizona *arizona = arizona_gpio->arizona;
40
41 return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
42 ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
43}
44
45static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
46{
47 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
48 struct arizona *arizona = arizona_gpio->arizona;
49 unsigned int val;
50 int ret;
51
52 ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
53 if (ret < 0)
54 return ret;
55
56 if (val & ARIZONA_GPN_LVL)
57 return 1;
58 else
59 return 0;
60}
61
62static int arizona_gpio_direction_out(struct gpio_chip *chip,
63 unsigned offset, int value)
64{
65 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
66 struct arizona *arizona = arizona_gpio->arizona;
67
68 if (value)
69 value = ARIZONA_GPN_LVL;
70
71 return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
72 ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
73}
74
75static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
76{
77 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
78 struct arizona *arizona = arizona_gpio->arizona;
79
80 if (value)
81 value = ARIZONA_GPN_LVL;
82
83 regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
84 ARIZONA_GPN_LVL, value);
85}
86
87static struct gpio_chip template_chip = {
88 .label = "arizona",
89 .owner = THIS_MODULE,
90 .direction_input = arizona_gpio_direction_in,
91 .get = arizona_gpio_get,
92 .direction_output = arizona_gpio_direction_out,
93 .set = arizona_gpio_set,
94 .can_sleep = true,
95};
96
97static int arizona_gpio_probe(struct platform_device *pdev)
98{
99 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
100 struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
101 struct arizona_gpio *arizona_gpio;
102 int ret;
103
104 arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
105 GFP_KERNEL);
106 if (!arizona_gpio)
107 return -ENOMEM;
108
109 arizona_gpio->arizona = arizona;
110 arizona_gpio->gpio_chip = template_chip;
111 arizona_gpio->gpio_chip.dev = &pdev->dev;
112#ifdef CONFIG_OF_GPIO
113 arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
114#endif
115
116 switch (arizona->type) {
117 case WM5102:
118 case WM5110:
119 case WM8280:
120 case WM8997:
121 case WM8998:
122 case WM1814:
123 arizona_gpio->gpio_chip.ngpio = 5;
124 break;
125 default:
126 dev_err(&pdev->dev, "Unknown chip variant %d\n",
127 arizona->type);
128 return -EINVAL;
129 }
130
131 if (pdata && pdata->gpio_base)
132 arizona_gpio->gpio_chip.base = pdata->gpio_base;
133 else
134 arizona_gpio->gpio_chip.base = -1;
135
136 ret = gpiochip_add(&arizona_gpio->gpio_chip);
137 if (ret < 0) {
138 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
139 ret);
140 goto err;
141 }
142
143 platform_set_drvdata(pdev, arizona_gpio);
144
145 return ret;
146
147err:
148 return ret;
149}
150
151static int arizona_gpio_remove(struct platform_device *pdev)
152{
153 struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
154
155 gpiochip_remove(&arizona_gpio->gpio_chip);
156 return 0;
157}
158
159static struct platform_driver arizona_gpio_driver = {
160 .driver.name = "arizona-gpio",
161 .probe = arizona_gpio_probe,
162 .remove = arizona_gpio_remove,
163};
164
165module_platform_driver(arizona_gpio_driver);
166
167MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
168MODULE_DESCRIPTION("GPIO interface for Arizona devices");
169MODULE_LICENSE("GPL");
170MODULE_ALIAS("platform:arizona-gpio");