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Commit | Line | Data |
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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 | ||
2956b5d9 MW |
106 | static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, |
107 | unsigned long config) | |
190ea434 LW |
108 | { |
109 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); | |
110 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
111 | ||
2956b5d9 MW |
112 | switch (pinconf_to_config_param(config)) { |
113 | case PIN_CONFIG_DRIVE_OPEN_DRAIN: | |
190ea434 LW |
114 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
115 | WM8994_GPN_OP_CFG_MASK, | |
116 | WM8994_GPN_OP_CFG); | |
2956b5d9 | 117 | case PIN_CONFIG_DRIVE_PUSH_PULL: |
190ea434 LW |
118 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
119 | WM8994_GPN_OP_CFG_MASK, 0); | |
120 | default: | |
121 | break; | |
122 | } | |
123 | ||
124 | return -ENOTSUPP; | |
125 | } | |
126 | ||
ddf438cf MB |
127 | static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
128 | { | |
765aa587 | 129 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
ddf438cf MB |
130 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
131 | ||
224a1f90 | 132 | return regmap_irq_get_virq(wm8994->irq_data, offset); |
ddf438cf MB |
133 | } |
134 | ||
135 | ||
2955c309 | 136 | #ifdef CONFIG_DEBUG_FS |
d0ad5e89 MB |
137 | static const char *wm8994_gpio_fn(u16 fn) |
138 | { | |
139 | switch (fn) { | |
140 | case WM8994_GP_FN_PIN_SPECIFIC: | |
141 | return "pin-specific"; | |
142 | case WM8994_GP_FN_GPIO: | |
143 | return "GPIO"; | |
144 | case WM8994_GP_FN_SDOUT: | |
145 | return "SDOUT"; | |
146 | case WM8994_GP_FN_IRQ: | |
147 | return "IRQ"; | |
148 | case WM8994_GP_FN_TEMPERATURE: | |
149 | return "Temperature"; | |
150 | case WM8994_GP_FN_MICBIAS1_DET: | |
151 | return "MICBIAS1 detect"; | |
152 | case WM8994_GP_FN_MICBIAS1_SHORT: | |
153 | return "MICBIAS1 short"; | |
154 | case WM8994_GP_FN_MICBIAS2_DET: | |
155 | return "MICBIAS2 detect"; | |
156 | case WM8994_GP_FN_MICBIAS2_SHORT: | |
157 | return "MICBIAS2 short"; | |
158 | case WM8994_GP_FN_FLL1_LOCK: | |
159 | return "FLL1 lock"; | |
160 | case WM8994_GP_FN_FLL2_LOCK: | |
161 | return "FLL2 lock"; | |
162 | case WM8994_GP_FN_SRC1_LOCK: | |
163 | return "SRC1 lock"; | |
164 | case WM8994_GP_FN_SRC2_LOCK: | |
165 | return "SRC2 lock"; | |
166 | case WM8994_GP_FN_DRC1_ACT: | |
167 | return "DRC1 activity"; | |
168 | case WM8994_GP_FN_DRC2_ACT: | |
169 | return "DRC2 activity"; | |
170 | case WM8994_GP_FN_DRC3_ACT: | |
171 | return "DRC3 activity"; | |
172 | case WM8994_GP_FN_WSEQ_STATUS: | |
173 | return "Write sequencer"; | |
174 | case WM8994_GP_FN_FIFO_ERROR: | |
175 | return "FIFO error"; | |
176 | case WM8994_GP_FN_OPCLK: | |
177 | return "OPCLK"; | |
178 | case WM8994_GP_FN_THW: | |
179 | return "Thermal warning"; | |
180 | case WM8994_GP_FN_DCS_DONE: | |
181 | return "DC servo"; | |
182 | case WM8994_GP_FN_FLL1_OUT: | |
183 | return "FLL1 output"; | |
184 | case WM8994_GP_FN_FLL2_OUT: | |
185 | return "FLL1 output"; | |
186 | default: | |
187 | return "Unknown"; | |
188 | } | |
189 | } | |
190 | ||
2955c309 MB |
191 | static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
192 | { | |
765aa587 | 193 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
194 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
195 | int i; | |
196 | ||
197 | for (i = 0; i < chip->ngpio; i++) { | |
198 | int gpio = i + chip->base; | |
199 | int reg; | |
200 | const char *label; | |
201 | ||
202 | /* We report the GPIO even if it's not requested since | |
203 | * we're also reporting things like alternate | |
204 | * functions which apply even when the GPIO is not in | |
205 | * use as a GPIO. | |
206 | */ | |
207 | label = gpiochip_is_requested(chip, i); | |
208 | if (!label) | |
209 | label = "Unrequested"; | |
210 | ||
211 | seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label); | |
212 | ||
213 | reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); | |
214 | if (reg < 0) { | |
215 | dev_err(wm8994->dev, | |
216 | "GPIO control %d read failed: %d\n", | |
217 | gpio, reg); | |
218 | seq_printf(s, "\n"); | |
219 | continue; | |
220 | } | |
221 | ||
d0ad5e89 MB |
222 | if (reg & WM8994_GPN_DIR) |
223 | seq_printf(s, "in "); | |
224 | else | |
225 | seq_printf(s, "out "); | |
226 | ||
227 | if (reg & WM8994_GPN_PU) | |
228 | seq_printf(s, "pull up "); | |
229 | ||
230 | if (reg & WM8994_GPN_PD) | |
231 | seq_printf(s, "pull down "); | |
232 | ||
233 | if (reg & WM8994_GPN_POL) | |
234 | seq_printf(s, "inverted "); | |
235 | else | |
236 | seq_printf(s, "noninverted "); | |
237 | ||
238 | if (reg & WM8994_GPN_OP_CFG) | |
239 | seq_printf(s, "open drain "); | |
240 | else | |
190ea434 | 241 | seq_printf(s, "push-pull "); |
d0ad5e89 MB |
242 | |
243 | seq_printf(s, "%s (%x)\n", | |
244 | wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); | |
2955c309 MB |
245 | } |
246 | } | |
247 | #else | |
248 | #define wm8994_gpio_dbg_show NULL | |
249 | #endif | |
250 | ||
e35b5ab0 | 251 | static const struct gpio_chip template_chip = { |
2955c309 MB |
252 | .label = "wm8994", |
253 | .owner = THIS_MODULE, | |
4b666729 | 254 | .request = wm8994_gpio_request, |
2955c309 MB |
255 | .direction_input = wm8994_gpio_direction_in, |
256 | .get = wm8994_gpio_get, | |
257 | .direction_output = wm8994_gpio_direction_out, | |
258 | .set = wm8994_gpio_set, | |
2956b5d9 | 259 | .set_config = wm8994_gpio_set_config, |
deb26e92 | 260 | .to_irq = wm8994_gpio_to_irq, |
2955c309 | 261 | .dbg_show = wm8994_gpio_dbg_show, |
9fb1f39e | 262 | .can_sleep = true, |
2955c309 MB |
263 | }; |
264 | ||
3836309d | 265 | static int wm8994_gpio_probe(struct platform_device *pdev) |
2955c309 MB |
266 | { |
267 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 268 | struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); |
2955c309 MB |
269 | struct wm8994_gpio *wm8994_gpio; |
270 | int ret; | |
271 | ||
f8d203c0 MB |
272 | wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), |
273 | GFP_KERNEL); | |
2955c309 MB |
274 | if (wm8994_gpio == NULL) |
275 | return -ENOMEM; | |
276 | ||
277 | wm8994_gpio->wm8994 = wm8994; | |
278 | wm8994_gpio->gpio_chip = template_chip; | |
279 | wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; | |
58383c78 | 280 | wm8994_gpio->gpio_chip.parent = &pdev->dev; |
2955c309 MB |
281 | if (pdata && pdata->gpio_base) |
282 | wm8994_gpio->gpio_chip.base = pdata->gpio_base; | |
283 | else | |
284 | wm8994_gpio->gpio_chip.base = -1; | |
285 | ||
c87dc4e4 LD |
286 | ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, |
287 | wm8994_gpio); | |
2955c309 MB |
288 | if (ret < 0) { |
289 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", | |
290 | ret); | |
c87dc4e4 | 291 | return ret; |
2955c309 MB |
292 | } |
293 | ||
294 | platform_set_drvdata(pdev, wm8994_gpio); | |
295 | ||
296 | return ret; | |
2955c309 MB |
297 | } |
298 | ||
299 | static struct platform_driver wm8994_gpio_driver = { | |
300 | .driver.name = "wm8994-gpio", | |
2955c309 | 301 | .probe = wm8994_gpio_probe, |
2955c309 MB |
302 | }; |
303 | ||
304 | static int __init wm8994_gpio_init(void) | |
305 | { | |
306 | return platform_driver_register(&wm8994_gpio_driver); | |
307 | } | |
308 | subsys_initcall(wm8994_gpio_init); | |
309 | ||
310 | static void __exit wm8994_gpio_exit(void) | |
311 | { | |
312 | platform_driver_unregister(&wm8994_gpio_driver); | |
313 | } | |
314 | module_exit(wm8994_gpio_exit); | |
315 | ||
316 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
317 | MODULE_DESCRIPTION("GPIO interface for WM8994"); | |
318 | MODULE_LICENSE("GPL"); | |
319 | MODULE_ALIAS("platform:wm8994-gpio"); |