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1 | /* |
2 | * wm8994-gpio.c -- gpiolib support for Wolfson WM8994 | |
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/wm8994/core.h> | |
23 | #include <linux/mfd/wm8994/pdata.h> | |
24 | #include <linux/mfd/wm8994/gpio.h> | |
25 | #include <linux/mfd/wm8994/registers.h> | |
26 | ||
27 | struct wm8994_gpio { | |
28 | struct wm8994 *wm8994; | |
29 | struct gpio_chip gpio_chip; | |
30 | }; | |
31 | ||
32 | static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip) | |
33 | { | |
34 | return container_of(chip, struct wm8994_gpio, gpio_chip); | |
35 | } | |
36 | ||
37 | static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) | |
38 | { | |
39 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
40 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
41 | ||
42 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, | |
43 | WM8994_GPN_DIR, WM8994_GPN_DIR); | |
44 | } | |
45 | ||
46 | static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) | |
47 | { | |
48 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
49 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
50 | int ret; | |
51 | ||
52 | ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); | |
53 | if (ret < 0) | |
54 | return ret; | |
55 | ||
56 | if (ret & WM8994_GPN_LVL) | |
57 | return 1; | |
58 | else | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static int wm8994_gpio_direction_out(struct gpio_chip *chip, | |
63 | unsigned offset, int value) | |
64 | { | |
65 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
66 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
67 | ||
68 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, | |
69 | WM8994_GPN_DIR, 0); | |
70 | } | |
71 | ||
72 | static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
73 | { | |
74 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
75 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
76 | ||
77 | if (value) | |
78 | value = WM8994_GPN_LVL; | |
79 | ||
80 | wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); | |
81 | } | |
82 | ||
83 | #ifdef CONFIG_DEBUG_FS | |
84 | static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) | |
85 | { | |
86 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
87 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
88 | int i; | |
89 | ||
90 | for (i = 0; i < chip->ngpio; i++) { | |
91 | int gpio = i + chip->base; | |
92 | int reg; | |
93 | const char *label; | |
94 | ||
95 | /* We report the GPIO even if it's not requested since | |
96 | * we're also reporting things like alternate | |
97 | * functions which apply even when the GPIO is not in | |
98 | * use as a GPIO. | |
99 | */ | |
100 | label = gpiochip_is_requested(chip, i); | |
101 | if (!label) | |
102 | label = "Unrequested"; | |
103 | ||
104 | seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); | |
105 | ||
106 | reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); | |
107 | if (reg < 0) { | |
108 | dev_err(wm8994->dev, | |
109 | "GPIO control %d read failed: %d\n", | |
110 | gpio, reg); | |
111 | seq_printf(s, "\n"); | |
112 | continue; | |
113 | } | |
114 | ||
115 | /* No decode yet; note that GPIO2 is special */ | |
116 | seq_printf(s, "(%x)\n", reg); | |
117 | } | |
118 | } | |
119 | #else | |
120 | #define wm8994_gpio_dbg_show NULL | |
121 | #endif | |
122 | ||
123 | static struct gpio_chip template_chip = { | |
124 | .label = "wm8994", | |
125 | .owner = THIS_MODULE, | |
126 | .direction_input = wm8994_gpio_direction_in, | |
127 | .get = wm8994_gpio_get, | |
128 | .direction_output = wm8994_gpio_direction_out, | |
129 | .set = wm8994_gpio_set, | |
130 | .dbg_show = wm8994_gpio_dbg_show, | |
131 | .can_sleep = 1, | |
132 | }; | |
133 | ||
134 | static int __devinit wm8994_gpio_probe(struct platform_device *pdev) | |
135 | { | |
136 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); | |
137 | struct wm8994_pdata *pdata = wm8994->dev->platform_data; | |
138 | struct wm8994_gpio *wm8994_gpio; | |
139 | int ret; | |
140 | ||
141 | wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL); | |
142 | if (wm8994_gpio == NULL) | |
143 | return -ENOMEM; | |
144 | ||
145 | wm8994_gpio->wm8994 = wm8994; | |
146 | wm8994_gpio->gpio_chip = template_chip; | |
147 | wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; | |
148 | wm8994_gpio->gpio_chip.dev = &pdev->dev; | |
149 | if (pdata && pdata->gpio_base) | |
150 | wm8994_gpio->gpio_chip.base = pdata->gpio_base; | |
151 | else | |
152 | wm8994_gpio->gpio_chip.base = -1; | |
153 | ||
154 | ret = gpiochip_add(&wm8994_gpio->gpio_chip); | |
155 | if (ret < 0) { | |
156 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
157 | ret); | |
158 | goto err; | |
159 | } | |
160 | ||
161 | platform_set_drvdata(pdev, wm8994_gpio); | |
162 | ||
163 | return ret; | |
164 | ||
165 | err: | |
166 | kfree(wm8994_gpio); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | static int __devexit wm8994_gpio_remove(struct platform_device *pdev) | |
171 | { | |
172 | struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev); | |
173 | int ret; | |
174 | ||
175 | ret = gpiochip_remove(&wm8994_gpio->gpio_chip); | |
176 | if (ret == 0) | |
177 | kfree(wm8994_gpio); | |
178 | ||
179 | return ret; | |
180 | } | |
181 | ||
182 | static struct platform_driver wm8994_gpio_driver = { | |
183 | .driver.name = "wm8994-gpio", | |
184 | .driver.owner = THIS_MODULE, | |
185 | .probe = wm8994_gpio_probe, | |
186 | .remove = __devexit_p(wm8994_gpio_remove), | |
187 | }; | |
188 | ||
189 | static int __init wm8994_gpio_init(void) | |
190 | { | |
191 | return platform_driver_register(&wm8994_gpio_driver); | |
192 | } | |
193 | subsys_initcall(wm8994_gpio_init); | |
194 | ||
195 | static void __exit wm8994_gpio_exit(void) | |
196 | { | |
197 | platform_driver_unregister(&wm8994_gpio_driver); | |
198 | } | |
199 | module_exit(wm8994_gpio_exit); | |
200 | ||
201 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
202 | MODULE_DESCRIPTION("GPIO interface for WM8994"); | |
203 | MODULE_LICENSE("GPL"); | |
204 | MODULE_ALIAS("platform:wm8994-gpio"); |