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1 | /* | |
2 | * 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/slab.h> | |
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/wm831x/core.h> | |
24 | #include <linux/mfd/wm831x/pdata.h> | |
25 | #include <linux/mfd/wm831x/gpio.h> | |
26 | #include <linux/mfd/wm831x/irq.h> | |
27 | ||
28 | struct wm831x_gpio { | |
29 | struct wm831x *wm831x; | |
30 | struct gpio_chip gpio_chip; | |
31 | }; | |
32 | ||
33 | static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip) | |
34 | { | |
35 | return container_of(chip, struct wm831x_gpio, gpio_chip); | |
36 | } | |
37 | ||
38 | static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) | |
39 | { | |
40 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
41 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
42 | int val = WM831X_GPN_DIR; | |
43 | ||
44 | if (wm831x->has_gpio_ena) | |
45 | val |= WM831X_GPN_TRI; | |
46 | ||
47 | return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset, | |
48 | WM831X_GPN_DIR | WM831X_GPN_TRI | | |
49 | WM831X_GPN_FN_MASK, val); | |
50 | } | |
51 | ||
52 | static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset) | |
53 | { | |
54 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
55 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
56 | int ret; | |
57 | ||
58 | ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL); | |
59 | if (ret < 0) | |
60 | return ret; | |
61 | ||
62 | if (ret & 1 << offset) | |
63 | return 1; | |
64 | else | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
69 | { | |
70 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
71 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
72 | ||
73 | wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset, | |
74 | value << offset); | |
75 | } | |
76 | ||
77 | static int wm831x_gpio_direction_out(struct gpio_chip *chip, | |
78 | unsigned offset, int value) | |
79 | { | |
80 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
81 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
82 | int val = 0; | |
83 | int ret; | |
84 | ||
85 | if (wm831x->has_gpio_ena) | |
86 | val |= WM831X_GPN_TRI; | |
87 | ||
88 | ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset, | |
89 | WM831X_GPN_DIR | WM831X_GPN_TRI | | |
90 | WM831X_GPN_FN_MASK, val); | |
91 | if (ret < 0) | |
92 | return ret; | |
93 | ||
94 | /* Can only set GPIO state once it's in output mode */ | |
95 | wm831x_gpio_set(chip, offset, value); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | |
101 | { | |
102 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
103 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
104 | ||
105 | return irq_create_mapping(wm831x->irq_domain, | |
106 | WM831X_IRQ_GPIO_1 + offset); | |
107 | } | |
108 | ||
109 | static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset, | |
110 | unsigned debounce) | |
111 | { | |
112 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
113 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
114 | int reg = WM831X_GPIO1_CONTROL + offset; | |
115 | int ret, fn; | |
116 | ||
117 | ret = wm831x_reg_read(wm831x, reg); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | ||
121 | switch (ret & WM831X_GPN_FN_MASK) { | |
122 | case 0: | |
123 | case 1: | |
124 | break; | |
125 | default: | |
126 | /* Not in GPIO mode */ | |
127 | return -EBUSY; | |
128 | } | |
129 | ||
130 | if (debounce >= 32 && debounce <= 64) | |
131 | fn = 0; | |
132 | else if (debounce >= 4000 && debounce <= 8000) | |
133 | fn = 1; | |
134 | else | |
135 | return -EINVAL; | |
136 | ||
137 | return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn); | |
138 | } | |
139 | ||
140 | #ifdef CONFIG_DEBUG_FS | |
141 | static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) | |
142 | { | |
143 | struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); | |
144 | struct wm831x *wm831x = wm831x_gpio->wm831x; | |
145 | int i, tristated; | |
146 | ||
147 | for (i = 0; i < chip->ngpio; i++) { | |
148 | int gpio = i + chip->base; | |
149 | int reg; | |
150 | const char *label, *pull, *powerdomain; | |
151 | ||
152 | /* We report the GPIO even if it's not requested since | |
153 | * we're also reporting things like alternate | |
154 | * functions which apply even when the GPIO is not in | |
155 | * use as a GPIO. | |
156 | */ | |
157 | label = gpiochip_is_requested(chip, i); | |
158 | if (!label) | |
159 | label = "Unrequested"; | |
160 | ||
161 | seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); | |
162 | ||
163 | reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i); | |
164 | if (reg < 0) { | |
165 | dev_err(wm831x->dev, | |
166 | "GPIO control %d read failed: %d\n", | |
167 | gpio, reg); | |
168 | seq_printf(s, "\n"); | |
169 | continue; | |
170 | } | |
171 | ||
172 | switch (reg & WM831X_GPN_PULL_MASK) { | |
173 | case WM831X_GPIO_PULL_NONE: | |
174 | pull = "nopull"; | |
175 | break; | |
176 | case WM831X_GPIO_PULL_DOWN: | |
177 | pull = "pulldown"; | |
178 | break; | |
179 | case WM831X_GPIO_PULL_UP: | |
180 | pull = "pullup"; | |
181 | break; | |
182 | default: | |
183 | pull = "INVALID PULL"; | |
184 | break; | |
185 | } | |
186 | ||
187 | switch (i + 1) { | |
188 | case 1 ... 3: | |
189 | case 7 ... 9: | |
190 | if (reg & WM831X_GPN_PWR_DOM) | |
191 | powerdomain = "VPMIC"; | |
192 | else | |
193 | powerdomain = "DBVDD"; | |
194 | break; | |
195 | ||
196 | case 4 ... 6: | |
197 | case 10 ... 12: | |
198 | if (reg & WM831X_GPN_PWR_DOM) | |
199 | powerdomain = "SYSVDD"; | |
200 | else | |
201 | powerdomain = "DBVDD"; | |
202 | break; | |
203 | ||
204 | case 13 ... 16: | |
205 | powerdomain = "TPVDD"; | |
206 | break; | |
207 | ||
208 | default: | |
209 | BUG(); | |
210 | break; | |
211 | } | |
212 | ||
213 | tristated = reg & WM831X_GPN_TRI; | |
214 | if (wm831x->has_gpio_ena) | |
215 | tristated = !tristated; | |
216 | ||
217 | seq_printf(s, " %s %s %s %s%s\n" | |
218 | " %s%s (0x%4x)\n", | |
219 | reg & WM831X_GPN_DIR ? "in" : "out", | |
220 | wm831x_gpio_get(chip, i) ? "high" : "low", | |
221 | pull, | |
222 | powerdomain, | |
223 | reg & WM831X_GPN_POL ? "" : " inverted", | |
224 | reg & WM831X_GPN_OD ? "open-drain" : "CMOS", | |
225 | tristated ? " tristated" : "", | |
226 | reg); | |
227 | } | |
228 | } | |
229 | #else | |
230 | #define wm831x_gpio_dbg_show NULL | |
231 | #endif | |
232 | ||
233 | static struct gpio_chip template_chip = { | |
234 | .label = "wm831x", | |
235 | .owner = THIS_MODULE, | |
236 | .direction_input = wm831x_gpio_direction_in, | |
237 | .get = wm831x_gpio_get, | |
238 | .direction_output = wm831x_gpio_direction_out, | |
239 | .set = wm831x_gpio_set, | |
240 | .to_irq = wm831x_gpio_to_irq, | |
241 | .set_debounce = wm831x_gpio_set_debounce, | |
242 | .dbg_show = wm831x_gpio_dbg_show, | |
243 | .can_sleep = 1, | |
244 | }; | |
245 | ||
246 | static int __devinit wm831x_gpio_probe(struct platform_device *pdev) | |
247 | { | |
248 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
249 | struct wm831x_pdata *pdata = wm831x->dev->platform_data; | |
250 | struct wm831x_gpio *wm831x_gpio; | |
251 | int ret; | |
252 | ||
253 | wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio), | |
254 | GFP_KERNEL); | |
255 | if (wm831x_gpio == NULL) | |
256 | return -ENOMEM; | |
257 | ||
258 | wm831x_gpio->wm831x = wm831x; | |
259 | wm831x_gpio->gpio_chip = template_chip; | |
260 | wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio; | |
261 | wm831x_gpio->gpio_chip.dev = &pdev->dev; | |
262 | if (pdata && pdata->gpio_base) | |
263 | wm831x_gpio->gpio_chip.base = pdata->gpio_base; | |
264 | else | |
265 | wm831x_gpio->gpio_chip.base = -1; | |
266 | ||
267 | ret = gpiochip_add(&wm831x_gpio->gpio_chip); | |
268 | if (ret < 0) { | |
269 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
270 | return ret; | |
271 | } | |
272 | ||
273 | platform_set_drvdata(pdev, wm831x_gpio); | |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | static int __devexit wm831x_gpio_remove(struct platform_device *pdev) | |
279 | { | |
280 | struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev); | |
281 | ||
282 | return gpiochip_remove(&wm831x_gpio->gpio_chip); | |
283 | } | |
284 | ||
285 | static struct platform_driver wm831x_gpio_driver = { | |
286 | .driver.name = "wm831x-gpio", | |
287 | .driver.owner = THIS_MODULE, | |
288 | .probe = wm831x_gpio_probe, | |
289 | .remove = __devexit_p(wm831x_gpio_remove), | |
290 | }; | |
291 | ||
292 | static int __init wm831x_gpio_init(void) | |
293 | { | |
294 | return platform_driver_register(&wm831x_gpio_driver); | |
295 | } | |
296 | subsys_initcall(wm831x_gpio_init); | |
297 | ||
298 | static void __exit wm831x_gpio_exit(void) | |
299 | { | |
300 | platform_driver_unregister(&wm831x_gpio_driver); | |
301 | } | |
302 | module_exit(wm831x_gpio_exit); | |
303 | ||
304 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
305 | MODULE_DESCRIPTION("GPIO interface for WM831x PMICs"); | |
306 | MODULE_LICENSE("GPL"); | |
307 | MODULE_ALIAS("platform:wm831x-gpio"); |