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1 | /* |
2 | * wm835x-gpiolib.c -- 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/module.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/mfd/core.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/seq_file.h> | |
21 | ||
22 | #include <linux/mfd/wm8350/core.h> | |
23 | #include <linux/mfd/wm8350/gpio.h> | |
24 | ||
25 | struct wm8350_gpio_data { | |
26 | struct wm8350 *wm8350; | |
27 | struct gpio_chip gpio_chip; | |
28 | }; | |
29 | ||
30 | static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip) | |
31 | { | |
32 | return container_of(chip, struct wm8350_gpio_data, gpio_chip); | |
33 | } | |
34 | ||
35 | static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) | |
36 | { | |
37 | struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); | |
38 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; | |
39 | ||
40 | return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, | |
41 | 1 << offset); | |
42 | } | |
43 | ||
44 | static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) | |
45 | { | |
46 | struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); | |
47 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; | |
48 | int ret; | |
49 | ||
50 | ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); | |
51 | if (ret < 0) | |
52 | return ret; | |
53 | ||
54 | if (ret & (1 << offset)) | |
55 | return 1; | |
56 | else | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
61 | { | |
62 | struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); | |
63 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; | |
64 | ||
65 | if (value) | |
66 | wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); | |
67 | else | |
68 | wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); | |
69 | } | |
70 | ||
71 | static int wm8350_gpio_direction_out(struct gpio_chip *chip, | |
72 | unsigned offset, int value) | |
73 | { | |
74 | struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); | |
75 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; | |
76 | int ret; | |
77 | ||
78 | ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, | |
79 | 1 << offset); | |
80 | if (ret < 0) | |
81 | return ret; | |
82 | ||
83 | /* Don't have an atomic direction/value setup */ | |
84 | wm8350_gpio_set(chip, offset, value); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | |
90 | { | |
91 | struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); | |
92 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; | |
93 | ||
94 | if (!wm8350->irq_base) | |
95 | return -EINVAL; | |
96 | ||
97 | return wm8350->irq_base + WM8350_IRQ_GPIO(offset); | |
98 | } | |
99 | ||
100 | static struct gpio_chip template_chip = { | |
101 | .label = "wm8350", | |
102 | .owner = THIS_MODULE, | |
103 | .direction_input = wm8350_gpio_direction_in, | |
104 | .get = wm8350_gpio_get, | |
105 | .direction_output = wm8350_gpio_direction_out, | |
106 | .set = wm8350_gpio_set, | |
107 | .to_irq = wm8350_gpio_to_irq, | |
108 | .can_sleep = 1, | |
109 | }; | |
110 | ||
111 | static int __devinit wm8350_gpio_probe(struct platform_device *pdev) | |
112 | { | |
113 | struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); | |
114 | struct wm8350_platform_data *pdata = wm8350->dev->platform_data; | |
115 | struct wm8350_gpio_data *wm8350_gpio; | |
116 | int ret; | |
117 | ||
118 | wm8350_gpio = kzalloc(sizeof(*wm8350_gpio), GFP_KERNEL); | |
119 | if (wm8350_gpio == NULL) | |
120 | return -ENOMEM; | |
121 | ||
122 | wm8350_gpio->wm8350 = wm8350; | |
123 | wm8350_gpio->gpio_chip = template_chip; | |
124 | wm8350_gpio->gpio_chip.ngpio = 13; | |
125 | wm8350_gpio->gpio_chip.dev = &pdev->dev; | |
126 | if (pdata && pdata->gpio_base) | |
127 | wm8350_gpio->gpio_chip.base = pdata->gpio_base; | |
128 | else | |
129 | wm8350_gpio->gpio_chip.base = -1; | |
130 | ||
131 | ret = gpiochip_add(&wm8350_gpio->gpio_chip); | |
132 | if (ret < 0) { | |
133 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
134 | ret); | |
135 | goto err; | |
136 | } | |
137 | ||
138 | platform_set_drvdata(pdev, wm8350_gpio); | |
139 | ||
140 | return ret; | |
141 | ||
142 | err: | |
143 | kfree(wm8350_gpio); | |
144 | return ret; | |
145 | } | |
146 | ||
147 | static int __devexit wm8350_gpio_remove(struct platform_device *pdev) | |
148 | { | |
149 | struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev); | |
150 | int ret; | |
151 | ||
152 | ret = gpiochip_remove(&wm8350_gpio->gpio_chip); | |
153 | if (ret == 0) | |
154 | kfree(wm8350_gpio); | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static struct platform_driver wm8350_gpio_driver = { | |
160 | .driver.name = "wm8350-gpio", | |
161 | .driver.owner = THIS_MODULE, | |
162 | .probe = wm8350_gpio_probe, | |
163 | .remove = __devexit_p(wm8350_gpio_remove), | |
164 | }; | |
165 | ||
166 | static int __init wm8350_gpio_init(void) | |
167 | { | |
168 | return platform_driver_register(&wm8350_gpio_driver); | |
169 | } | |
170 | subsys_initcall(wm8350_gpio_init); | |
171 | ||
172 | static void __exit wm8350_gpio_exit(void) | |
173 | { | |
174 | platform_driver_unregister(&wm8350_gpio_driver); | |
175 | } | |
176 | module_exit(wm8350_gpio_exit); | |
177 | ||
178 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
179 | MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); | |
180 | MODULE_LICENSE("GPL"); | |
181 | MODULE_ALIAS("platform:wm8350-gpio"); |