Commit | Line | Data |
---|---|---|
38f6ce45 | 1 | /* |
c103de24 | 2 | * gpiolib support for Wolfson WM835x PMICs |
38f6ce45 MB |
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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
38f6ce45 MB |
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 | ||
26 | struct wm8350_gpio_data { | |
27 | struct wm8350 *wm8350; | |
28 | struct gpio_chip gpio_chip; | |
29 | }; | |
30 | ||
38f6ce45 MB |
31 | static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
32 | { | |
dfcdf721 | 33 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
34 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
35 | ||
36 | return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, | |
37 | 1 << offset); | |
38 | } | |
39 | ||
40 | static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) | |
41 | { | |
dfcdf721 | 42 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
43 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
44 | int ret; | |
45 | ||
46 | ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); | |
47 | if (ret < 0) | |
48 | return ret; | |
49 | ||
50 | if (ret & (1 << offset)) | |
51 | return 1; | |
52 | else | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
57 | { | |
dfcdf721 | 58 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
59 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
60 | ||
61 | if (value) | |
62 | wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); | |
63 | else | |
64 | wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); | |
65 | } | |
66 | ||
67 | static int wm8350_gpio_direction_out(struct gpio_chip *chip, | |
68 | unsigned offset, int value) | |
69 | { | |
dfcdf721 | 70 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
71 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
72 | int ret; | |
73 | ||
74 | ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, | |
75 | 1 << offset); | |
76 | if (ret < 0) | |
77 | return ret; | |
78 | ||
79 | /* Don't have an atomic direction/value setup */ | |
80 | wm8350_gpio_set(chip, offset, value); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | |
86 | { | |
dfcdf721 | 87 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
88 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
89 | ||
90 | if (!wm8350->irq_base) | |
91 | return -EINVAL; | |
92 | ||
93 | return wm8350->irq_base + WM8350_IRQ_GPIO(offset); | |
94 | } | |
95 | ||
96 | static struct gpio_chip template_chip = { | |
97 | .label = "wm8350", | |
98 | .owner = THIS_MODULE, | |
99 | .direction_input = wm8350_gpio_direction_in, | |
100 | .get = wm8350_gpio_get, | |
101 | .direction_output = wm8350_gpio_direction_out, | |
102 | .set = wm8350_gpio_set, | |
103 | .to_irq = wm8350_gpio_to_irq, | |
9fb1f39e | 104 | .can_sleep = true, |
38f6ce45 MB |
105 | }; |
106 | ||
3836309d | 107 | static int wm8350_gpio_probe(struct platform_device *pdev) |
38f6ce45 MB |
108 | { |
109 | struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 110 | struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); |
38f6ce45 MB |
111 | struct wm8350_gpio_data *wm8350_gpio; |
112 | int ret; | |
113 | ||
5b425438 AL |
114 | wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), |
115 | GFP_KERNEL); | |
38f6ce45 MB |
116 | if (wm8350_gpio == NULL) |
117 | return -ENOMEM; | |
118 | ||
119 | wm8350_gpio->wm8350 = wm8350; | |
120 | wm8350_gpio->gpio_chip = template_chip; | |
121 | wm8350_gpio->gpio_chip.ngpio = 13; | |
58383c78 | 122 | wm8350_gpio->gpio_chip.parent = &pdev->dev; |
38f6ce45 MB |
123 | if (pdata && pdata->gpio_base) |
124 | wm8350_gpio->gpio_chip.base = pdata->gpio_base; | |
125 | else | |
126 | wm8350_gpio->gpio_chip.base = -1; | |
127 | ||
dfcdf721 | 128 | ret = gpiochip_add_data(&wm8350_gpio->gpio_chip, wm8350_gpio); |
38f6ce45 | 129 | if (ret < 0) { |
5b425438 AL |
130 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); |
131 | return ret; | |
38f6ce45 MB |
132 | } |
133 | ||
134 | platform_set_drvdata(pdev, wm8350_gpio); | |
135 | ||
136 | return ret; | |
38f6ce45 MB |
137 | } |
138 | ||
206210ce | 139 | static int wm8350_gpio_remove(struct platform_device *pdev) |
38f6ce45 MB |
140 | { |
141 | struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev); | |
38f6ce45 | 142 | |
9f5132ae | 143 | gpiochip_remove(&wm8350_gpio->gpio_chip); |
144 | return 0; | |
38f6ce45 MB |
145 | } |
146 | ||
147 | static struct platform_driver wm8350_gpio_driver = { | |
148 | .driver.name = "wm8350-gpio", | |
149 | .driver.owner = THIS_MODULE, | |
150 | .probe = wm8350_gpio_probe, | |
8283c4ff | 151 | .remove = wm8350_gpio_remove, |
38f6ce45 MB |
152 | }; |
153 | ||
154 | static int __init wm8350_gpio_init(void) | |
155 | { | |
156 | return platform_driver_register(&wm8350_gpio_driver); | |
157 | } | |
158 | subsys_initcall(wm8350_gpio_init); | |
159 | ||
160 | static void __exit wm8350_gpio_exit(void) | |
161 | { | |
162 | platform_driver_unregister(&wm8350_gpio_driver); | |
163 | } | |
164 | module_exit(wm8350_gpio_exit); | |
165 | ||
166 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
167 | MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); | |
168 | MODULE_LICENSE("GPL"); | |
169 | MODULE_ALIAS("platform:wm8350-gpio"); |