Commit | Line | Data |
---|---|---|
2955c309 | 1 | /* |
c103de24 | 2 | * gpiolib support for Wolfson WM8994 |
2955c309 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> |
2955c309 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/wm8994/core.h> | |
24 | #include <linux/mfd/wm8994/pdata.h> | |
25 | #include <linux/mfd/wm8994/gpio.h> | |
26 | #include <linux/mfd/wm8994/registers.h> | |
27 | ||
28 | struct wm8994_gpio { | |
29 | struct wm8994 *wm8994; | |
30 | struct gpio_chip gpio_chip; | |
31 | }; | |
32 | ||
33 | static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip) | |
34 | { | |
35 | return container_of(chip, struct wm8994_gpio, gpio_chip); | |
36 | } | |
37 | ||
4b666729 MB |
38 | static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) |
39 | { | |
40 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
41 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
42 | ||
43 | switch (wm8994->type) { | |
44 | case WM8958: | |
45 | switch (offset) { | |
46 | case 1: | |
47 | case 2: | |
48 | case 3: | |
49 | case 4: | |
50 | case 6: | |
51 | return -EINVAL; | |
52 | } | |
53 | break; | |
54 | default: | |
55 | break; | |
56 | } | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
2955c309 MB |
61 | static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
62 | { | |
63 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
64 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
65 | ||
66 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, | |
67 | WM8994_GPN_DIR, WM8994_GPN_DIR); | |
68 | } | |
69 | ||
70 | static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) | |
71 | { | |
72 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
73 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
74 | int ret; | |
75 | ||
76 | ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); | |
77 | if (ret < 0) | |
78 | return ret; | |
79 | ||
80 | if (ret & WM8994_GPN_LVL) | |
81 | return 1; | |
82 | else | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static int wm8994_gpio_direction_out(struct gpio_chip *chip, | |
87 | unsigned offset, int value) | |
88 | { | |
89 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
90 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
91 | ||
92 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, | |
93 | WM8994_GPN_DIR, 0); | |
94 | } | |
95 | ||
96 | static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
97 | { | |
98 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
99 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
100 | ||
101 | if (value) | |
102 | value = WM8994_GPN_LVL; | |
103 | ||
104 | wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); | |
105 | } | |
106 | ||
ddf438cf MB |
107 | static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
108 | { | |
109 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
110 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
111 | ||
112 | if (!wm8994->irq_base) | |
113 | return -EINVAL; | |
114 | ||
115 | return wm8994->irq_base + offset; | |
116 | } | |
117 | ||
118 | ||
2955c309 | 119 | #ifdef CONFIG_DEBUG_FS |
d0ad5e89 MB |
120 | static const char *wm8994_gpio_fn(u16 fn) |
121 | { | |
122 | switch (fn) { | |
123 | case WM8994_GP_FN_PIN_SPECIFIC: | |
124 | return "pin-specific"; | |
125 | case WM8994_GP_FN_GPIO: | |
126 | return "GPIO"; | |
127 | case WM8994_GP_FN_SDOUT: | |
128 | return "SDOUT"; | |
129 | case WM8994_GP_FN_IRQ: | |
130 | return "IRQ"; | |
131 | case WM8994_GP_FN_TEMPERATURE: | |
132 | return "Temperature"; | |
133 | case WM8994_GP_FN_MICBIAS1_DET: | |
134 | return "MICBIAS1 detect"; | |
135 | case WM8994_GP_FN_MICBIAS1_SHORT: | |
136 | return "MICBIAS1 short"; | |
137 | case WM8994_GP_FN_MICBIAS2_DET: | |
138 | return "MICBIAS2 detect"; | |
139 | case WM8994_GP_FN_MICBIAS2_SHORT: | |
140 | return "MICBIAS2 short"; | |
141 | case WM8994_GP_FN_FLL1_LOCK: | |
142 | return "FLL1 lock"; | |
143 | case WM8994_GP_FN_FLL2_LOCK: | |
144 | return "FLL2 lock"; | |
145 | case WM8994_GP_FN_SRC1_LOCK: | |
146 | return "SRC1 lock"; | |
147 | case WM8994_GP_FN_SRC2_LOCK: | |
148 | return "SRC2 lock"; | |
149 | case WM8994_GP_FN_DRC1_ACT: | |
150 | return "DRC1 activity"; | |
151 | case WM8994_GP_FN_DRC2_ACT: | |
152 | return "DRC2 activity"; | |
153 | case WM8994_GP_FN_DRC3_ACT: | |
154 | return "DRC3 activity"; | |
155 | case WM8994_GP_FN_WSEQ_STATUS: | |
156 | return "Write sequencer"; | |
157 | case WM8994_GP_FN_FIFO_ERROR: | |
158 | return "FIFO error"; | |
159 | case WM8994_GP_FN_OPCLK: | |
160 | return "OPCLK"; | |
161 | case WM8994_GP_FN_THW: | |
162 | return "Thermal warning"; | |
163 | case WM8994_GP_FN_DCS_DONE: | |
164 | return "DC servo"; | |
165 | case WM8994_GP_FN_FLL1_OUT: | |
166 | return "FLL1 output"; | |
167 | case WM8994_GP_FN_FLL2_OUT: | |
168 | return "FLL1 output"; | |
169 | default: | |
170 | return "Unknown"; | |
171 | } | |
172 | } | |
173 | ||
2955c309 MB |
174 | static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
175 | { | |
176 | struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip); | |
177 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
178 | int i; | |
179 | ||
180 | for (i = 0; i < chip->ngpio; i++) { | |
181 | int gpio = i + chip->base; | |
182 | int reg; | |
183 | const char *label; | |
184 | ||
185 | /* We report the GPIO even if it's not requested since | |
186 | * we're also reporting things like alternate | |
187 | * functions which apply even when the GPIO is not in | |
188 | * use as a GPIO. | |
189 | */ | |
190 | label = gpiochip_is_requested(chip, i); | |
191 | if (!label) | |
192 | label = "Unrequested"; | |
193 | ||
194 | seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); | |
195 | ||
196 | reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); | |
197 | if (reg < 0) { | |
198 | dev_err(wm8994->dev, | |
199 | "GPIO control %d read failed: %d\n", | |
200 | gpio, reg); | |
201 | seq_printf(s, "\n"); | |
202 | continue; | |
203 | } | |
204 | ||
d0ad5e89 MB |
205 | if (reg & WM8994_GPN_DIR) |
206 | seq_printf(s, "in "); | |
207 | else | |
208 | seq_printf(s, "out "); | |
209 | ||
210 | if (reg & WM8994_GPN_PU) | |
211 | seq_printf(s, "pull up "); | |
212 | ||
213 | if (reg & WM8994_GPN_PD) | |
214 | seq_printf(s, "pull down "); | |
215 | ||
216 | if (reg & WM8994_GPN_POL) | |
217 | seq_printf(s, "inverted "); | |
218 | else | |
219 | seq_printf(s, "noninverted "); | |
220 | ||
221 | if (reg & WM8994_GPN_OP_CFG) | |
222 | seq_printf(s, "open drain "); | |
223 | else | |
224 | seq_printf(s, "CMOS "); | |
225 | ||
226 | seq_printf(s, "%s (%x)\n", | |
227 | wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); | |
2955c309 MB |
228 | } |
229 | } | |
230 | #else | |
231 | #define wm8994_gpio_dbg_show NULL | |
232 | #endif | |
233 | ||
234 | static struct gpio_chip template_chip = { | |
235 | .label = "wm8994", | |
236 | .owner = THIS_MODULE, | |
4b666729 | 237 | .request = wm8994_gpio_request, |
2955c309 MB |
238 | .direction_input = wm8994_gpio_direction_in, |
239 | .get = wm8994_gpio_get, | |
240 | .direction_output = wm8994_gpio_direction_out, | |
241 | .set = wm8994_gpio_set, | |
deb26e92 | 242 | .to_irq = wm8994_gpio_to_irq, |
2955c309 MB |
243 | .dbg_show = wm8994_gpio_dbg_show, |
244 | .can_sleep = 1, | |
245 | }; | |
246 | ||
247 | static int __devinit wm8994_gpio_probe(struct platform_device *pdev) | |
248 | { | |
249 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); | |
250 | struct wm8994_pdata *pdata = wm8994->dev->platform_data; | |
251 | struct wm8994_gpio *wm8994_gpio; | |
252 | int ret; | |
253 | ||
254 | wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL); | |
255 | if (wm8994_gpio == NULL) | |
256 | return -ENOMEM; | |
257 | ||
258 | wm8994_gpio->wm8994 = wm8994; | |
259 | wm8994_gpio->gpio_chip = template_chip; | |
260 | wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; | |
261 | wm8994_gpio->gpio_chip.dev = &pdev->dev; | |
262 | if (pdata && pdata->gpio_base) | |
263 | wm8994_gpio->gpio_chip.base = pdata->gpio_base; | |
264 | else | |
265 | wm8994_gpio->gpio_chip.base = -1; | |
266 | ||
267 | ret = gpiochip_add(&wm8994_gpio->gpio_chip); | |
268 | if (ret < 0) { | |
269 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
270 | ret); | |
271 | goto err; | |
272 | } | |
273 | ||
274 | platform_set_drvdata(pdev, wm8994_gpio); | |
275 | ||
276 | return ret; | |
277 | ||
278 | err: | |
279 | kfree(wm8994_gpio); | |
280 | return ret; | |
281 | } | |
282 | ||
283 | static int __devexit wm8994_gpio_remove(struct platform_device *pdev) | |
284 | { | |
285 | struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev); | |
286 | int ret; | |
287 | ||
288 | ret = gpiochip_remove(&wm8994_gpio->gpio_chip); | |
289 | if (ret == 0) | |
290 | kfree(wm8994_gpio); | |
291 | ||
292 | return ret; | |
293 | } | |
294 | ||
295 | static struct platform_driver wm8994_gpio_driver = { | |
296 | .driver.name = "wm8994-gpio", | |
297 | .driver.owner = THIS_MODULE, | |
298 | .probe = wm8994_gpio_probe, | |
299 | .remove = __devexit_p(wm8994_gpio_remove), | |
300 | }; | |
301 | ||
302 | static int __init wm8994_gpio_init(void) | |
303 | { | |
304 | return platform_driver_register(&wm8994_gpio_driver); | |
305 | } | |
306 | subsys_initcall(wm8994_gpio_init); | |
307 | ||
308 | static void __exit wm8994_gpio_exit(void) | |
309 | { | |
310 | platform_driver_unregister(&wm8994_gpio_driver); | |
311 | } | |
312 | module_exit(wm8994_gpio_exit); | |
313 | ||
314 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
315 | MODULE_DESCRIPTION("GPIO interface for WM8994"); | |
316 | MODULE_LICENSE("GPL"); | |
317 | MODULE_ALIAS("platform:wm8994-gpio"); |