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Mark Brown38f6ce42010-01-07 16:10:08 +00001/*
Grant Likelyc103de22011-06-04 18:38:28 -06002 * gpiolib support for Wolfson WM835x PMICs
Mark Brown38f6ce42010-01-07 16:10:08 +00003 *
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Mark Brown38f6ce42010-01-07 16:10:08 +000017#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
Bill Pemberton38363092012-11-19 13:22:34 -0500112static int wm8350_gpio_probe(struct platform_device *pdev)
Mark Brown38f6ce42010-01-07 16:10:08 +0000113{
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
Axel Lin5b425432012-09-02 11:58:59 +0800119 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
120 GFP_KERNEL);
Mark Brown38f6ce42010-01-07 16:10:08 +0000121 if (wm8350_gpio == NULL)
122 return -ENOMEM;
123
124 wm8350_gpio->wm8350 = wm8350;
125 wm8350_gpio->gpio_chip = template_chip;
126 wm8350_gpio->gpio_chip.ngpio = 13;
127 wm8350_gpio->gpio_chip.dev = &pdev->dev;
128 if (pdata && pdata->gpio_base)
129 wm8350_gpio->gpio_chip.base = pdata->gpio_base;
130 else
131 wm8350_gpio->gpio_chip.base = -1;
132
133 ret = gpiochip_add(&wm8350_gpio->gpio_chip);
134 if (ret < 0) {
Axel Lin5b425432012-09-02 11:58:59 +0800135 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
136 return ret;
Mark Brown38f6ce42010-01-07 16:10:08 +0000137 }
138
139 platform_set_drvdata(pdev, wm8350_gpio);
140
141 return ret;
Mark Brown38f6ce42010-01-07 16:10:08 +0000142}
143
Bill Pemberton206210c2012-11-19 13:25:50 -0500144static int wm8350_gpio_remove(struct platform_device *pdev)
Mark Brown38f6ce42010-01-07 16:10:08 +0000145{
146 struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
Mark Brown38f6ce42010-01-07 16:10:08 +0000147
Axel Lin5b425432012-09-02 11:58:59 +0800148 return gpiochip_remove(&wm8350_gpio->gpio_chip);
Mark Brown38f6ce42010-01-07 16:10:08 +0000149}
150
151static struct platform_driver wm8350_gpio_driver = {
152 .driver.name = "wm8350-gpio",
153 .driver.owner = THIS_MODULE,
154 .probe = wm8350_gpio_probe,
Bill Pemberton8283c4f2012-11-19 13:20:08 -0500155 .remove = wm8350_gpio_remove,
Mark Brown38f6ce42010-01-07 16:10:08 +0000156};
157
158static int __init wm8350_gpio_init(void)
159{
160 return platform_driver_register(&wm8350_gpio_driver);
161}
162subsys_initcall(wm8350_gpio_init);
163
164static void __exit wm8350_gpio_exit(void)
165{
166 platform_driver_unregister(&wm8350_gpio_driver);
167}
168module_exit(wm8350_gpio_exit);
169
170MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
171MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
172MODULE_LICENSE("GPL");
173MODULE_ALIAS("platform:wm8350-gpio");