Root/drivers/gpio/gpio-wm8350.c

1/*
2 * gpiolib support for Wolfson WM835x PMICs
3 *
4 * Copyright 2009 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/mfd/core.h>
20#include <linux/platform_device.h>
21#include <linux/seq_file.h>
22
23#include <linux/mfd/wm8350/core.h>
24#include <linux/mfd/wm8350/gpio.h>
25
26struct wm8350_gpio_data {
27    struct wm8350 *wm8350;
28    struct gpio_chip gpio_chip;
29};
30
31static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip)
32{
33    return container_of(chip, struct wm8350_gpio_data, gpio_chip);
34}
35
36static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
37{
38    struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
39    struct wm8350 *wm8350 = wm8350_gpio->wm8350;
40
41    return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
42                   1 << offset);
43}
44
45static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
46{
47    struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
48    struct wm8350 *wm8350 = wm8350_gpio->wm8350;
49    int ret;
50
51    ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
52    if (ret < 0)
53        return ret;
54
55    if (ret & (1 << offset))
56        return 1;
57    else
58        return 0;
59}
60
61static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
62{
63    struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
64    struct wm8350 *wm8350 = wm8350_gpio->wm8350;
65
66    if (value)
67        wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
68    else
69        wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
70}
71
72static int wm8350_gpio_direction_out(struct gpio_chip *chip,
73                     unsigned offset, int value)
74{
75    struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
76    struct wm8350 *wm8350 = wm8350_gpio->wm8350;
77    int ret;
78
79    ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
80                1 << offset);
81    if (ret < 0)
82        return ret;
83
84    /* Don't have an atomic direction/value setup */
85    wm8350_gpio_set(chip, offset, value);
86
87    return 0;
88}
89
90static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
91{
92    struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
93    struct wm8350 *wm8350 = wm8350_gpio->wm8350;
94
95    if (!wm8350->irq_base)
96        return -EINVAL;
97
98    return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
99}
100
101static struct gpio_chip template_chip = {
102    .label = "wm8350",
103    .owner = THIS_MODULE,
104    .direction_input = wm8350_gpio_direction_in,
105    .get = wm8350_gpio_get,
106    .direction_output = wm8350_gpio_direction_out,
107    .set = wm8350_gpio_set,
108    .to_irq = wm8350_gpio_to_irq,
109    .can_sleep = 1,
110};
111
112static int __devinit wm8350_gpio_probe(struct platform_device *pdev)
113{
114    struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
115    struct wm8350_platform_data *pdata = wm8350->dev->platform_data;
116    struct wm8350_gpio_data *wm8350_gpio;
117    int ret;
118
119    wm8350_gpio = kzalloc(sizeof(*wm8350_gpio), GFP_KERNEL);
120    if (wm8350_gpio == NULL)
121        return -ENOMEM;
122
123    wm8350_gpio->wm8350 = wm8350;
124    wm8350_gpio->gpio_chip = template_chip;
125    wm8350_gpio->gpio_chip.ngpio = 13;
126    wm8350_gpio->gpio_chip.dev = &pdev->dev;
127    if (pdata && pdata->gpio_base)
128        wm8350_gpio->gpio_chip.base = pdata->gpio_base;
129    else
130        wm8350_gpio->gpio_chip.base = -1;
131
132    ret = gpiochip_add(&wm8350_gpio->gpio_chip);
133    if (ret < 0) {
134        dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
135            ret);
136        goto err;
137    }
138
139    platform_set_drvdata(pdev, wm8350_gpio);
140
141    return ret;
142
143err:
144    kfree(wm8350_gpio);
145    return ret;
146}
147
148static int __devexit wm8350_gpio_remove(struct platform_device *pdev)
149{
150    struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
151    int ret;
152
153    ret = gpiochip_remove(&wm8350_gpio->gpio_chip);
154    if (ret == 0)
155        kfree(wm8350_gpio);
156
157    return ret;
158}
159
160static struct platform_driver wm8350_gpio_driver = {
161    .driver.name = "wm8350-gpio",
162    .driver.owner = THIS_MODULE,
163    .probe = wm8350_gpio_probe,
164    .remove = __devexit_p(wm8350_gpio_remove),
165};
166
167static int __init wm8350_gpio_init(void)
168{
169    return platform_driver_register(&wm8350_gpio_driver);
170}
171subsys_initcall(wm8350_gpio_init);
172
173static void __exit wm8350_gpio_exit(void)
174{
175    platform_driver_unregister(&wm8350_gpio_driver);
176}
177module_exit(wm8350_gpio_exit);
178
179MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
180MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
181MODULE_LICENSE("GPL");
182MODULE_ALIAS("platform:wm8350-gpio");
183

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