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> | |
224a1f90 | 22 | #include <linux/regmap.h> |
2955c309 MB |
23 | |
24 | #include <linux/mfd/wm8994/core.h> | |
25 | #include <linux/mfd/wm8994/pdata.h> | |
26 | #include <linux/mfd/wm8994/gpio.h> | |
27 | #include <linux/mfd/wm8994/registers.h> | |
28 | ||
29 | struct wm8994_gpio { | |
30 | struct wm8994 *wm8994; | |
31 | struct gpio_chip gpio_chip; | |
32 | }; | |
33 | ||
4b666729 MB |
34 | static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) |
35 | { | |
765aa587 | 36 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
4b666729 MB |
37 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
38 | ||
39 | switch (wm8994->type) { | |
40 | case WM8958: | |
41 | switch (offset) { | |
42 | case 1: | |
43 | case 2: | |
44 | case 3: | |
45 | case 4: | |
46 | case 6: | |
47 | return -EINVAL; | |
48 | } | |
49 | break; | |
50 | default: | |
51 | break; | |
52 | } | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
2955c309 MB |
57 | static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
58 | { | |
765aa587 | 59 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
60 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
61 | ||
62 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, | |
63 | WM8994_GPN_DIR, WM8994_GPN_DIR); | |
64 | } | |
65 | ||
66 | static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) | |
67 | { | |
765aa587 | 68 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
69 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
70 | int ret; | |
71 | ||
72 | ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); | |
73 | if (ret < 0) | |
74 | return ret; | |
75 | ||
76 | if (ret & WM8994_GPN_LVL) | |
77 | return 1; | |
78 | else | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static int wm8994_gpio_direction_out(struct gpio_chip *chip, | |
83 | unsigned offset, int value) | |
84 | { | |
765aa587 | 85 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
86 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
87 | ||
8cd578b6 MB |
88 | if (value) |
89 | value = WM8994_GPN_LVL; | |
90 | ||
2955c309 | 91 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
8cd578b6 | 92 | WM8994_GPN_DIR | WM8994_GPN_LVL, value); |
2955c309 MB |
93 | } |
94 | ||
95 | static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
96 | { | |
765aa587 | 97 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
98 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
99 | ||
100 | if (value) | |
101 | value = WM8994_GPN_LVL; | |
102 | ||
103 | wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); | |
104 | } | |
105 | ||
ddf438cf MB |
106 | static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
107 | { | |
765aa587 | 108 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
ddf438cf MB |
109 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
110 | ||
224a1f90 | 111 | return regmap_irq_get_virq(wm8994->irq_data, offset); |
ddf438cf MB |
112 | } |
113 | ||
114 | ||
2955c309 | 115 | #ifdef CONFIG_DEBUG_FS |
d0ad5e89 MB |
116 | static const char *wm8994_gpio_fn(u16 fn) |
117 | { | |
118 | switch (fn) { | |
119 | case WM8994_GP_FN_PIN_SPECIFIC: | |
120 | return "pin-specific"; | |
121 | case WM8994_GP_FN_GPIO: | |
122 | return "GPIO"; | |
123 | case WM8994_GP_FN_SDOUT: | |
124 | return "SDOUT"; | |
125 | case WM8994_GP_FN_IRQ: | |
126 | return "IRQ"; | |
127 | case WM8994_GP_FN_TEMPERATURE: | |
128 | return "Temperature"; | |
129 | case WM8994_GP_FN_MICBIAS1_DET: | |
130 | return "MICBIAS1 detect"; | |
131 | case WM8994_GP_FN_MICBIAS1_SHORT: | |
132 | return "MICBIAS1 short"; | |
133 | case WM8994_GP_FN_MICBIAS2_DET: | |
134 | return "MICBIAS2 detect"; | |
135 | case WM8994_GP_FN_MICBIAS2_SHORT: | |
136 | return "MICBIAS2 short"; | |
137 | case WM8994_GP_FN_FLL1_LOCK: | |
138 | return "FLL1 lock"; | |
139 | case WM8994_GP_FN_FLL2_LOCK: | |
140 | return "FLL2 lock"; | |
141 | case WM8994_GP_FN_SRC1_LOCK: | |
142 | return "SRC1 lock"; | |
143 | case WM8994_GP_FN_SRC2_LOCK: | |
144 | return "SRC2 lock"; | |
145 | case WM8994_GP_FN_DRC1_ACT: | |
146 | return "DRC1 activity"; | |
147 | case WM8994_GP_FN_DRC2_ACT: | |
148 | return "DRC2 activity"; | |
149 | case WM8994_GP_FN_DRC3_ACT: | |
150 | return "DRC3 activity"; | |
151 | case WM8994_GP_FN_WSEQ_STATUS: | |
152 | return "Write sequencer"; | |
153 | case WM8994_GP_FN_FIFO_ERROR: | |
154 | return "FIFO error"; | |
155 | case WM8994_GP_FN_OPCLK: | |
156 | return "OPCLK"; | |
157 | case WM8994_GP_FN_THW: | |
158 | return "Thermal warning"; | |
159 | case WM8994_GP_FN_DCS_DONE: | |
160 | return "DC servo"; | |
161 | case WM8994_GP_FN_FLL1_OUT: | |
162 | return "FLL1 output"; | |
163 | case WM8994_GP_FN_FLL2_OUT: | |
164 | return "FLL1 output"; | |
165 | default: | |
166 | return "Unknown"; | |
167 | } | |
168 | } | |
169 | ||
2955c309 MB |
170 | static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
171 | { | |
765aa587 | 172 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
173 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
174 | int i; | |
175 | ||
176 | for (i = 0; i < chip->ngpio; i++) { | |
177 | int gpio = i + chip->base; | |
178 | int reg; | |
179 | const char *label; | |
180 | ||
181 | /* We report the GPIO even if it's not requested since | |
182 | * we're also reporting things like alternate | |
183 | * functions which apply even when the GPIO is not in | |
184 | * use as a GPIO. | |
185 | */ | |
186 | label = gpiochip_is_requested(chip, i); | |
187 | if (!label) | |
188 | label = "Unrequested"; | |
189 | ||
190 | seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); | |
191 | ||
192 | reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); | |
193 | if (reg < 0) { | |
194 | dev_err(wm8994->dev, | |
195 | "GPIO control %d read failed: %d\n", | |
196 | gpio, reg); | |
197 | seq_printf(s, "\n"); | |
198 | continue; | |
199 | } | |
200 | ||
d0ad5e89 MB |
201 | if (reg & WM8994_GPN_DIR) |
202 | seq_printf(s, "in "); | |
203 | else | |
204 | seq_printf(s, "out "); | |
205 | ||
206 | if (reg & WM8994_GPN_PU) | |
207 | seq_printf(s, "pull up "); | |
208 | ||
209 | if (reg & WM8994_GPN_PD) | |
210 | seq_printf(s, "pull down "); | |
211 | ||
212 | if (reg & WM8994_GPN_POL) | |
213 | seq_printf(s, "inverted "); | |
214 | else | |
215 | seq_printf(s, "noninverted "); | |
216 | ||
217 | if (reg & WM8994_GPN_OP_CFG) | |
218 | seq_printf(s, "open drain "); | |
219 | else | |
220 | seq_printf(s, "CMOS "); | |
221 | ||
222 | seq_printf(s, "%s (%x)\n", | |
223 | wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); | |
2955c309 MB |
224 | } |
225 | } | |
226 | #else | |
227 | #define wm8994_gpio_dbg_show NULL | |
228 | #endif | |
229 | ||
230 | static struct gpio_chip template_chip = { | |
231 | .label = "wm8994", | |
232 | .owner = THIS_MODULE, | |
4b666729 | 233 | .request = wm8994_gpio_request, |
2955c309 MB |
234 | .direction_input = wm8994_gpio_direction_in, |
235 | .get = wm8994_gpio_get, | |
236 | .direction_output = wm8994_gpio_direction_out, | |
237 | .set = wm8994_gpio_set, | |
deb26e92 | 238 | .to_irq = wm8994_gpio_to_irq, |
2955c309 | 239 | .dbg_show = wm8994_gpio_dbg_show, |
9fb1f39e | 240 | .can_sleep = true, |
2955c309 MB |
241 | }; |
242 | ||
3836309d | 243 | static int wm8994_gpio_probe(struct platform_device *pdev) |
2955c309 MB |
244 | { |
245 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 246 | struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); |
2955c309 MB |
247 | struct wm8994_gpio *wm8994_gpio; |
248 | int ret; | |
249 | ||
f8d203c0 MB |
250 | wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), |
251 | GFP_KERNEL); | |
2955c309 MB |
252 | if (wm8994_gpio == NULL) |
253 | return -ENOMEM; | |
254 | ||
255 | wm8994_gpio->wm8994 = wm8994; | |
256 | wm8994_gpio->gpio_chip = template_chip; | |
257 | wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; | |
58383c78 | 258 | wm8994_gpio->gpio_chip.parent = &pdev->dev; |
2955c309 MB |
259 | if (pdata && pdata->gpio_base) |
260 | wm8994_gpio->gpio_chip.base = pdata->gpio_base; | |
261 | else | |
262 | wm8994_gpio->gpio_chip.base = -1; | |
263 | ||
765aa587 | 264 | ret = gpiochip_add_data(&wm8994_gpio->gpio_chip, wm8994_gpio); |
2955c309 MB |
265 | if (ret < 0) { |
266 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
267 | ret); | |
268 | goto err; | |
269 | } | |
270 | ||
271 | platform_set_drvdata(pdev, wm8994_gpio); | |
272 | ||
273 | return ret; | |
274 | ||
275 | err: | |
2955c309 MB |
276 | return ret; |
277 | } | |
278 | ||
206210ce | 279 | static int wm8994_gpio_remove(struct platform_device *pdev) |
2955c309 MB |
280 | { |
281 | struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev); | |
2955c309 | 282 | |
9f5132ae | 283 | gpiochip_remove(&wm8994_gpio->gpio_chip); |
284 | return 0; | |
2955c309 MB |
285 | } |
286 | ||
287 | static struct platform_driver wm8994_gpio_driver = { | |
288 | .driver.name = "wm8994-gpio", | |
289 | .driver.owner = THIS_MODULE, | |
290 | .probe = wm8994_gpio_probe, | |
8283c4ff | 291 | .remove = wm8994_gpio_remove, |
2955c309 MB |
292 | }; |
293 | ||
294 | static int __init wm8994_gpio_init(void) | |
295 | { | |
296 | return platform_driver_register(&wm8994_gpio_driver); | |
297 | } | |
298 | subsys_initcall(wm8994_gpio_init); | |
299 | ||
300 | static void __exit wm8994_gpio_exit(void) | |
301 | { | |
302 | platform_driver_unregister(&wm8994_gpio_driver); | |
303 | } | |
304 | module_exit(wm8994_gpio_exit); | |
305 | ||
306 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
307 | MODULE_DESCRIPTION("GPIO interface for WM8994"); | |
308 | MODULE_LICENSE("GPL"); | |
309 | MODULE_ALIAS("platform:wm8994-gpio"); |