Commit | Line | Data |
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66dbe750 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
2955c309 | 2 | /* |
c103de24 | 3 | * gpiolib support for Wolfson WM8994 |
2955c309 MB |
4 | * |
5 | * Copyright 2009 Wolfson Microelectronics PLC. | |
6 | * | |
7 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
8 | * | |
2955c309 MB |
9 | */ |
10 | ||
abeec1ad | 11 | #include <linux/cleanup.h> |
2955c309 | 12 | #include <linux/kernel.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
2955c309 | 14 | #include <linux/module.h> |
10833c4b | 15 | #include <linux/gpio/driver.h> |
2955c309 MB |
16 | #include <linux/mfd/core.h> |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/seq_file.h> | |
224a1f90 | 19 | #include <linux/regmap.h> |
2955c309 MB |
20 | |
21 | #include <linux/mfd/wm8994/core.h> | |
22 | #include <linux/mfd/wm8994/pdata.h> | |
23 | #include <linux/mfd/wm8994/gpio.h> | |
24 | #include <linux/mfd/wm8994/registers.h> | |
25 | ||
26 | struct wm8994_gpio { | |
27 | struct wm8994 *wm8994; | |
28 | struct gpio_chip gpio_chip; | |
29 | }; | |
30 | ||
4b666729 MB |
31 | static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) |
32 | { | |
765aa587 | 33 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
4b666729 MB |
34 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
35 | ||
36 | switch (wm8994->type) { | |
37 | case WM8958: | |
38 | switch (offset) { | |
39 | case 1: | |
40 | case 2: | |
41 | case 3: | |
42 | case 4: | |
43 | case 6: | |
44 | return -EINVAL; | |
45 | } | |
46 | break; | |
47 | default: | |
48 | break; | |
49 | } | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
2955c309 MB |
54 | static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
55 | { | |
765aa587 | 56 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
57 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
58 | ||
59 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, | |
60 | WM8994_GPN_DIR, WM8994_GPN_DIR); | |
61 | } | |
62 | ||
63 | static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) | |
64 | { | |
765aa587 | 65 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
66 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
67 | int ret; | |
68 | ||
69 | ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); | |
70 | if (ret < 0) | |
71 | return ret; | |
72 | ||
73 | if (ret & WM8994_GPN_LVL) | |
74 | return 1; | |
75 | else | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static int wm8994_gpio_direction_out(struct gpio_chip *chip, | |
80 | unsigned offset, int value) | |
81 | { | |
765aa587 | 82 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
83 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
84 | ||
8cd578b6 MB |
85 | if (value) |
86 | value = WM8994_GPN_LVL; | |
87 | ||
2955c309 | 88 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
8cd578b6 | 89 | WM8994_GPN_DIR | WM8994_GPN_LVL, value); |
2955c309 MB |
90 | } |
91 | ||
92 | static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
93 | { | |
765aa587 | 94 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
95 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
96 | ||
97 | if (value) | |
98 | value = WM8994_GPN_LVL; | |
99 | ||
100 | wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); | |
101 | } | |
102 | ||
2956b5d9 MW |
103 | static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, |
104 | unsigned long config) | |
190ea434 LW |
105 | { |
106 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); | |
107 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; | |
108 | ||
2956b5d9 MW |
109 | switch (pinconf_to_config_param(config)) { |
110 | case PIN_CONFIG_DRIVE_OPEN_DRAIN: | |
190ea434 LW |
111 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
112 | WM8994_GPN_OP_CFG_MASK, | |
113 | WM8994_GPN_OP_CFG); | |
2956b5d9 | 114 | case PIN_CONFIG_DRIVE_PUSH_PULL: |
190ea434 LW |
115 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
116 | WM8994_GPN_OP_CFG_MASK, 0); | |
117 | default: | |
118 | break; | |
119 | } | |
120 | ||
121 | return -ENOTSUPP; | |
122 | } | |
123 | ||
ddf438cf MB |
124 | static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
125 | { | |
765aa587 | 126 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
ddf438cf MB |
127 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
128 | ||
224a1f90 | 129 | return regmap_irq_get_virq(wm8994->irq_data, offset); |
ddf438cf MB |
130 | } |
131 | ||
132 | ||
2955c309 | 133 | #ifdef CONFIG_DEBUG_FS |
d0ad5e89 MB |
134 | static const char *wm8994_gpio_fn(u16 fn) |
135 | { | |
136 | switch (fn) { | |
137 | case WM8994_GP_FN_PIN_SPECIFIC: | |
138 | return "pin-specific"; | |
139 | case WM8994_GP_FN_GPIO: | |
140 | return "GPIO"; | |
141 | case WM8994_GP_FN_SDOUT: | |
142 | return "SDOUT"; | |
143 | case WM8994_GP_FN_IRQ: | |
144 | return "IRQ"; | |
145 | case WM8994_GP_FN_TEMPERATURE: | |
146 | return "Temperature"; | |
147 | case WM8994_GP_FN_MICBIAS1_DET: | |
148 | return "MICBIAS1 detect"; | |
149 | case WM8994_GP_FN_MICBIAS1_SHORT: | |
150 | return "MICBIAS1 short"; | |
151 | case WM8994_GP_FN_MICBIAS2_DET: | |
152 | return "MICBIAS2 detect"; | |
153 | case WM8994_GP_FN_MICBIAS2_SHORT: | |
154 | return "MICBIAS2 short"; | |
155 | case WM8994_GP_FN_FLL1_LOCK: | |
156 | return "FLL1 lock"; | |
157 | case WM8994_GP_FN_FLL2_LOCK: | |
158 | return "FLL2 lock"; | |
159 | case WM8994_GP_FN_SRC1_LOCK: | |
160 | return "SRC1 lock"; | |
161 | case WM8994_GP_FN_SRC2_LOCK: | |
162 | return "SRC2 lock"; | |
163 | case WM8994_GP_FN_DRC1_ACT: | |
164 | return "DRC1 activity"; | |
165 | case WM8994_GP_FN_DRC2_ACT: | |
166 | return "DRC2 activity"; | |
167 | case WM8994_GP_FN_DRC3_ACT: | |
168 | return "DRC3 activity"; | |
169 | case WM8994_GP_FN_WSEQ_STATUS: | |
170 | return "Write sequencer"; | |
171 | case WM8994_GP_FN_FIFO_ERROR: | |
172 | return "FIFO error"; | |
173 | case WM8994_GP_FN_OPCLK: | |
174 | return "OPCLK"; | |
175 | case WM8994_GP_FN_THW: | |
176 | return "Thermal warning"; | |
177 | case WM8994_GP_FN_DCS_DONE: | |
178 | return "DC servo"; | |
179 | case WM8994_GP_FN_FLL1_OUT: | |
180 | return "FLL1 output"; | |
181 | case WM8994_GP_FN_FLL2_OUT: | |
182 | return "FLL1 output"; | |
183 | default: | |
184 | return "Unknown"; | |
185 | } | |
186 | } | |
187 | ||
2955c309 MB |
188 | static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
189 | { | |
765aa587 | 190 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); |
2955c309 MB |
191 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
192 | int i; | |
193 | ||
194 | for (i = 0; i < chip->ngpio; i++) { | |
195 | int gpio = i + chip->base; | |
196 | int reg; | |
2955c309 MB |
197 | |
198 | /* We report the GPIO even if it's not requested since | |
199 | * we're also reporting things like alternate | |
200 | * functions which apply even when the GPIO is not in | |
201 | * use as a GPIO. | |
202 | */ | |
abeec1ad BG |
203 | char *label __free(kfree) = gpiochip_dup_line_label(chip, i); |
204 | if (IS_ERR(label)) { | |
205 | dev_err(wm8994->dev, "Failed to duplicate label\n"); | |
206 | continue; | |
207 | } | |
2955c309 | 208 | |
abeec1ad BG |
209 | seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, |
210 | label ?: "Unrequested"); | |
2955c309 MB |
211 | |
212 | reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); | |
213 | if (reg < 0) { | |
214 | dev_err(wm8994->dev, | |
215 | "GPIO control %d read failed: %d\n", | |
216 | gpio, reg); | |
217 | seq_printf(s, "\n"); | |
218 | continue; | |
219 | } | |
220 | ||
d0ad5e89 MB |
221 | if (reg & WM8994_GPN_DIR) |
222 | seq_printf(s, "in "); | |
223 | else | |
224 | seq_printf(s, "out "); | |
225 | ||
226 | if (reg & WM8994_GPN_PU) | |
227 | seq_printf(s, "pull up "); | |
228 | ||
229 | if (reg & WM8994_GPN_PD) | |
230 | seq_printf(s, "pull down "); | |
231 | ||
232 | if (reg & WM8994_GPN_POL) | |
233 | seq_printf(s, "inverted "); | |
234 | else | |
235 | seq_printf(s, "noninverted "); | |
236 | ||
237 | if (reg & WM8994_GPN_OP_CFG) | |
238 | seq_printf(s, "open drain "); | |
239 | else | |
190ea434 | 240 | seq_printf(s, "push-pull "); |
d0ad5e89 MB |
241 | |
242 | seq_printf(s, "%s (%x)\n", | |
243 | wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); | |
2955c309 MB |
244 | } |
245 | } | |
246 | #else | |
247 | #define wm8994_gpio_dbg_show NULL | |
248 | #endif | |
249 | ||
e35b5ab0 | 250 | static const struct gpio_chip template_chip = { |
2955c309 MB |
251 | .label = "wm8994", |
252 | .owner = THIS_MODULE, | |
4b666729 | 253 | .request = wm8994_gpio_request, |
2955c309 MB |
254 | .direction_input = wm8994_gpio_direction_in, |
255 | .get = wm8994_gpio_get, | |
256 | .direction_output = wm8994_gpio_direction_out, | |
257 | .set = wm8994_gpio_set, | |
2956b5d9 | 258 | .set_config = wm8994_gpio_set_config, |
deb26e92 | 259 | .to_irq = wm8994_gpio_to_irq, |
2955c309 | 260 | .dbg_show = wm8994_gpio_dbg_show, |
9fb1f39e | 261 | .can_sleep = true, |
2955c309 MB |
262 | }; |
263 | ||
3836309d | 264 | static int wm8994_gpio_probe(struct platform_device *pdev) |
2955c309 MB |
265 | { |
266 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 267 | struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); |
2955c309 | 268 | struct wm8994_gpio *wm8994_gpio; |
2955c309 | 269 | |
f8d203c0 MB |
270 | wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), |
271 | GFP_KERNEL); | |
2955c309 MB |
272 | if (wm8994_gpio == NULL) |
273 | return -ENOMEM; | |
274 | ||
275 | wm8994_gpio->wm8994 = wm8994; | |
276 | wm8994_gpio->gpio_chip = template_chip; | |
277 | wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; | |
58383c78 | 278 | wm8994_gpio->gpio_chip.parent = &pdev->dev; |
2955c309 MB |
279 | if (pdata && pdata->gpio_base) |
280 | wm8994_gpio->gpio_chip.base = pdata->gpio_base; | |
281 | else | |
282 | wm8994_gpio->gpio_chip.base = -1; | |
283 | ||
e076aeda | 284 | return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio); |
2955c309 MB |
285 | } |
286 | ||
287 | static struct platform_driver wm8994_gpio_driver = { | |
288 | .driver.name = "wm8994-gpio", | |
2955c309 | 289 | .probe = wm8994_gpio_probe, |
2955c309 MB |
290 | }; |
291 | ||
292 | static int __init wm8994_gpio_init(void) | |
293 | { | |
294 | return platform_driver_register(&wm8994_gpio_driver); | |
295 | } | |
296 | subsys_initcall(wm8994_gpio_init); | |
297 | ||
298 | static void __exit wm8994_gpio_exit(void) | |
299 | { | |
300 | platform_driver_unregister(&wm8994_gpio_driver); | |
301 | } | |
302 | module_exit(wm8994_gpio_exit); | |
303 | ||
304 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
305 | MODULE_DESCRIPTION("GPIO interface for WM8994"); | |
306 | MODULE_LICENSE("GPL"); | |
307 | MODULE_ALIAS("platform:wm8994-gpio"); |