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Mark Brown31ba56f2012-06-23 13:29:25 +01001/*
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 = 1,
95};
96
Bill Pemberton38363092012-11-19 13:22:34 -050097static int arizona_gpio_probe(struct platform_device *pdev)
Mark Brown31ba56f2012-06-23 13:29:25 +010098{
99 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
100 struct arizona_pdata *pdata = arizona->dev->platform_data;
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 == NULL)
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
113 switch (arizona->type) {
114 case WM5102:
115 case WM5110:
116 arizona_gpio->gpio_chip.ngpio = 5;
117 break;
118 default:
119 dev_err(&pdev->dev, "Unknown chip variant %d\n",
120 arizona->type);
121 return -EINVAL;
122 }
123
124 if (pdata && pdata->gpio_base)
125 arizona_gpio->gpio_chip.base = pdata->gpio_base;
126 else
127 arizona_gpio->gpio_chip.base = -1;
128
129 ret = gpiochip_add(&arizona_gpio->gpio_chip);
130 if (ret < 0) {
131 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
132 ret);
133 goto err;
134 }
135
136 platform_set_drvdata(pdev, arizona_gpio);
137
138 return ret;
139
140err:
141 return ret;
142}
143
Bill Pemberton206210c2012-11-19 13:25:50 -0500144static int arizona_gpio_remove(struct platform_device *pdev)
Mark Brown31ba56f2012-06-23 13:29:25 +0100145{
146 struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
147
148 return gpiochip_remove(&arizona_gpio->gpio_chip);
149}
150
151static struct platform_driver arizona_gpio_driver = {
152 .driver.name = "arizona-gpio",
153 .driver.owner = THIS_MODULE,
154 .probe = arizona_gpio_probe,
Bill Pemberton8283c4f2012-11-19 13:20:08 -0500155 .remove = arizona_gpio_remove,
Mark Brown31ba56f2012-06-23 13:29:25 +0100156};
157
158module_platform_driver(arizona_gpio_driver);
159
160MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
161MODULE_DESCRIPTION("GPIO interface for Arizona devices");
162MODULE_LICENSE("GPL");
163MODULE_ALIAS("platform:arizona-gpio");