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e4b736f1 MB |
1 | /* |
2 | * wm831x-gpio.c -- gpiolib support for Wolfson WM831x 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/wm831x/core.h> | |
23 | #include <linux/mfd/wm831x/pdata.h> | |
24 | #include <linux/mfd/wm831x/gpio.h> | |
dc0fb25c | 25 | #include <linux/mfd/wm831x/irq.h> |
e4b736f1 | 26 | |
e4b736f1 MB |
27 | struct wm831x_gpio { |
28 | struct wm831x *wm831x; | |
29 | struct gpio_chip gpio_chip; | |
30 | }; | |
31 | ||
32 | static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip) | |
33 | { | |
34 | return container_of(chip, struct wm831x_gpio, gpio_chip); | |
35 | } | |
36 | ||
37 | static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) | |
38 | { | |
39 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
40 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
41 | ||
42 | return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset, | |
43 | WM831X_GPN_DIR | WM831X_GPN_TRI, | |
44 | WM831X_GPN_DIR); | |
45 | } | |
46 | ||
47 | static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset) | |
48 | { | |
49 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
50 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
51 | int ret; | |
52 | ||
53 | ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); | |
54 | if (ret < 0) | |
55 | return ret; | |
56 | ||
57 | if (ret & 1 << offset) | |
58 | return 1; | |
59 | else | |
60 | return 0; | |
61 | } | |
62 | ||
3383d23d | 63 | static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
e4b736f1 MB |
64 | { |
65 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
66 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
67 | ||
3383d23d MB |
68 | wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset, |
69 | value << offset); | |
e4b736f1 MB |
70 | } |
71 | ||
3383d23d MB |
72 | static int wm831x_gpio_direction_out(struct gpio_chip *chip, |
73 | unsigned offset, int value) | |
e4b736f1 MB |
74 | { |
75 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
76 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
3383d23d | 77 | int ret; |
e4b736f1 | 78 | |
3383d23d MB |
79 | ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset, |
80 | WM831X_GPN_DIR | WM831X_GPN_TRI, 0); | |
81 | if (ret < 0) | |
82 | return ret; | |
83 | ||
84 | /* Can only set GPIO state once it's in output mode */ | |
85 | wm831x_gpio_set(chip, offset, value); | |
86 | ||
87 | return 0; | |
e4b736f1 MB |
88 | } |
89 | ||
dc0fb25c MB |
90 | static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
91 | { | |
92 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
93 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
94 | ||
95 | if (!wm831x->irq_base) | |
96 | return -EINVAL; | |
97 | ||
98 | return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset; | |
99 | } | |
100 | ||
e4b736f1 MB |
101 | #ifdef CONFIG_DEBUG_FS |
102 | static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) | |
103 | { | |
104 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
105 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
106 | int i; | |
107 | ||
108 | for (i = 0; i < chip->ngpio; i++) { | |
109 | int gpio = i + chip->base; | |
110 | int reg; | |
111 | const char *label, *pull, *powerdomain; | |
112 | ||
113 | /* We report the GPIO even if it's not requested since | |
114 | * we're also reporting things like alternate | |
115 | * functions which apply even when the GPIO is not in | |
116 | * use as a GPIO. | |
117 | */ | |
118 | label = gpiochip_is_requested(chip, i); | |
119 | if (!label) | |
120 | label = "Unrequested"; | |
121 | ||
122 | seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); | |
123 | ||
124 | reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i); | |
125 | if (reg < 0) { | |
126 | dev_err(wm831x->dev, | |
127 | "GPIO control %d read failed: %d\n", | |
128 | gpio, reg); | |
129 | seq_printf(s, "\n"); | |
130 | continue; | |
131 | } | |
132 | ||
133 | switch (reg & WM831X_GPN_PULL_MASK) { | |
134 | case WM831X_GPIO_PULL_NONE: | |
135 | pull = "nopull"; | |
136 | break; | |
137 | case WM831X_GPIO_PULL_DOWN: | |
138 | pull = "pulldown"; | |
139 | break; | |
140 | case WM831X_GPIO_PULL_UP: | |
141 | pull = "pullup"; | |
142 | default: | |
143 | pull = "INVALID PULL"; | |
144 | break; | |
145 | } | |
146 | ||
147 | switch (i + 1) { | |
148 | case 1 ... 3: | |
149 | case 7 ... 9: | |
150 | if (reg & WM831X_GPN_PWR_DOM) | |
151 | powerdomain = "VPMIC"; | |
152 | else | |
153 | powerdomain = "DBVDD"; | |
154 | break; | |
155 | ||
156 | case 4 ... 6: | |
157 | case 10 ... 12: | |
158 | if (reg & WM831X_GPN_PWR_DOM) | |
159 | powerdomain = "SYSVDD"; | |
160 | else | |
161 | powerdomain = "DBVDD"; | |
162 | break; | |
163 | ||
164 | case 13 ... 16: | |
165 | powerdomain = "TPVDD"; | |
166 | break; | |
167 | ||
168 | default: | |
169 | BUG(); | |
170 | break; | |
171 | } | |
172 | ||
173 | seq_printf(s, " %s %s %s %s%s\n" | |
174 | " %s%s (0x%4x)\n", | |
175 | reg & WM831X_GPN_DIR ? "in" : "out", | |
176 | wm831x_gpio_get(chip, i) ? "high" : "low", | |
177 | pull, | |
178 | powerdomain, | |
179 | reg & WM831X_GPN_POL ? " inverted" : "", | |
180 | reg & WM831X_GPN_OD ? "open-drain" : "CMOS", | |
181 | reg & WM831X_GPN_TRI ? " tristated" : "", | |
182 | reg); | |
183 | } | |
184 | } | |
185 | #else | |
186 | #define wm831x_gpio_dbg_show NULL | |
187 | #endif | |
188 | ||
189 | static struct gpio_chip template_chip = { | |
190 | .label = "wm831x", | |
191 | .owner = THIS_MODULE, | |
192 | .direction_input = wm831x_gpio_direction_in, | |
193 | .get = wm831x_gpio_get, | |
194 | .direction_output = wm831x_gpio_direction_out, | |
195 | .set = wm831x_gpio_set, | |
dc0fb25c | 196 | .to_irq = wm831x_gpio_to_irq, |
e4b736f1 MB |
197 | .dbg_show = wm831x_gpio_dbg_show, |
198 | .can_sleep = 1, | |
199 | }; | |
200 | ||
201 | static int __devinit wm831x_gpio_probe(struct platform_device *pdev) | |
202 | { | |
203 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
204 | struct wm831x_pdata *pdata = wm831x->dev->platform_data; | |
205 | struct wm831x_gpio *wm831x_gpio; | |
206 | int ret; | |
207 | ||
208 | wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL); | |
209 | if (wm831x_gpio == NULL) | |
210 | return -ENOMEM; | |
211 | ||
212 | wm831x_gpio->wm831x = wm831x; | |
213 | wm831x_gpio->gpio_chip = template_chip; | |
6f2ecaae | 214 | wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio; |
e4b736f1 MB |
215 | wm831x_gpio->gpio_chip.dev = &pdev->dev; |
216 | if (pdata && pdata->gpio_base) | |
217 | wm831x_gpio->gpio_chip.base = pdata->gpio_base; | |
218 | else | |
219 | wm831x_gpio->gpio_chip.base = -1; | |
220 | ||
221 | ret = gpiochip_add(&wm831x_gpio->gpio_chip); | |
222 | if (ret < 0) { | |
223 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
224 | ret); | |
225 | goto err; | |
226 | } | |
227 | ||
228 | platform_set_drvdata(pdev, wm831x_gpio); | |
229 | ||
230 | return ret; | |
231 | ||
232 | err: | |
233 | kfree(wm831x_gpio); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | static int __devexit wm831x_gpio_remove(struct platform_device *pdev) | |
238 | { | |
239 | struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev); | |
240 | int ret; | |
241 | ||
242 | ret = gpiochip_remove(&wm831x_gpio->gpio_chip); | |
243 | if (ret == 0) | |
244 | kfree(wm831x_gpio); | |
245 | ||
246 | return ret; | |
247 | } | |
248 | ||
249 | static struct platform_driver wm831x_gpio_driver = { | |
250 | .driver.name = "wm831x-gpio", | |
251 | .driver.owner = THIS_MODULE, | |
252 | .probe = wm831x_gpio_probe, | |
253 | .remove = __devexit_p(wm831x_gpio_remove), | |
254 | }; | |
255 | ||
256 | static int __init wm831x_gpio_init(void) | |
257 | { | |
258 | return platform_driver_register(&wm831x_gpio_driver); | |
259 | } | |
260 | subsys_initcall(wm831x_gpio_init); | |
261 | ||
262 | static void __exit wm831x_gpio_exit(void) | |
263 | { | |
264 | platform_driver_unregister(&wm831x_gpio_driver); | |
265 | } | |
266 | module_exit(wm831x_gpio_exit); | |
267 | ||
268 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
269 | MODULE_DESCRIPTION("GPIO interface for WM831x PMICs"); | |
270 | MODULE_LICENSE("GPL"); | |
271 | MODULE_ALIAS("platform:wm831x-gpio"); |