1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * gpiolib support for Wolfson WM8994 |
4 | * |
5 | * Copyright 2009 Wolfson Microelectronics PLC. |
6 | * |
7 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
8 | * |
9 | */ |
10 | |
11 | #include <linux/cleanup.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/module.h> |
15 | #include <linux/gpio/driver.h> |
16 | #include <linux/mfd/core.h> |
17 | #include <linux/platform_device.h> |
18 | #include <linux/seq_file.h> |
19 | #include <linux/regmap.h> |
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 | |
31 | static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) |
32 | { |
33 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
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 | |
54 | static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
55 | { |
56 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
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 | { |
65 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
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 | { |
82 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
83 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
84 | |
85 | if (value) |
86 | value = WM8994_GPN_LVL; |
87 | |
88 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
89 | WM8994_GPN_DIR | WM8994_GPN_LVL, val: value); |
90 | } |
91 | |
92 | static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
93 | { |
94 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
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, val: value); |
101 | } |
102 | |
103 | static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, |
104 | unsigned long config) |
105 | { |
106 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
107 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
108 | |
109 | switch (pinconf_to_config_param(config)) { |
110 | case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
111 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
112 | WM8994_GPN_OP_CFG_MASK, |
113 | WM8994_GPN_OP_CFG); |
114 | case PIN_CONFIG_DRIVE_PUSH_PULL: |
115 | return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, |
116 | WM8994_GPN_OP_CFG_MASK, val: 0); |
117 | default: |
118 | break; |
119 | } |
120 | |
121 | return -ENOTSUPP; |
122 | } |
123 | |
124 | static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
125 | { |
126 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
127 | struct wm8994 *wm8994 = wm8994_gpio->wm8994; |
128 | |
129 | return regmap_irq_get_virq(data: wm8994->irq_data, irq: offset); |
130 | } |
131 | |
132 | |
133 | #ifdef CONFIG_DEBUG_FS |
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 | |
188 | static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
189 | { |
190 | struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(gc: chip); |
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; |
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 | */ |
203 | char *label __free(kfree) = gpiochip_dup_line_label(gc: chip, offset: i); |
204 | if (IS_ERR(ptr: label)) { |
205 | dev_err(wm8994->dev, "Failed to duplicate label\n" ); |
206 | continue; |
207 | } |
208 | |
209 | seq_printf(m: s, fmt: " gpio-%-3d (%-20.20s) " , gpio, |
210 | label ?: "Unrequested" ); |
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(m: s, fmt: "\n" ); |
218 | continue; |
219 | } |
220 | |
221 | if (reg & WM8994_GPN_DIR) |
222 | seq_printf(m: s, fmt: "in " ); |
223 | else |
224 | seq_printf(m: s, fmt: "out " ); |
225 | |
226 | if (reg & WM8994_GPN_PU) |
227 | seq_printf(m: s, fmt: "pull up " ); |
228 | |
229 | if (reg & WM8994_GPN_PD) |
230 | seq_printf(m: s, fmt: "pull down " ); |
231 | |
232 | if (reg & WM8994_GPN_POL) |
233 | seq_printf(m: s, fmt: "inverted " ); |
234 | else |
235 | seq_printf(m: s, fmt: "noninverted " ); |
236 | |
237 | if (reg & WM8994_GPN_OP_CFG) |
238 | seq_printf(m: s, fmt: "open drain " ); |
239 | else |
240 | seq_printf(m: s, fmt: "push-pull " ); |
241 | |
242 | seq_printf(m: s, fmt: "%s (%x)\n" , |
243 | wm8994_gpio_fn(fn: reg & WM8994_GPN_FN_MASK), reg); |
244 | } |
245 | } |
246 | #else |
247 | #define wm8994_gpio_dbg_show NULL |
248 | #endif |
249 | |
250 | static const struct gpio_chip template_chip = { |
251 | .label = "wm8994" , |
252 | .owner = THIS_MODULE, |
253 | .request = wm8994_gpio_request, |
254 | .direction_input = wm8994_gpio_direction_in, |
255 | .get = wm8994_gpio_get, |
256 | .direction_output = wm8994_gpio_direction_out, |
257 | .set = wm8994_gpio_set, |
258 | .set_config = wm8994_gpio_set_config, |
259 | .to_irq = wm8994_gpio_to_irq, |
260 | .dbg_show = wm8994_gpio_dbg_show, |
261 | .can_sleep = true, |
262 | }; |
263 | |
264 | static int wm8994_gpio_probe(struct platform_device *pdev) |
265 | { |
266 | struct wm8994 *wm8994 = dev_get_drvdata(dev: pdev->dev.parent); |
267 | struct wm8994_pdata *pdata = dev_get_platdata(dev: wm8994->dev); |
268 | struct wm8994_gpio *wm8994_gpio; |
269 | |
270 | wm8994_gpio = devm_kzalloc(dev: &pdev->dev, size: sizeof(*wm8994_gpio), |
271 | GFP_KERNEL); |
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; |
278 | wm8994_gpio->gpio_chip.parent = &pdev->dev; |
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 | |
284 | return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio); |
285 | } |
286 | |
287 | static struct platform_driver wm8994_gpio_driver = { |
288 | .driver.name = "wm8994-gpio" , |
289 | .probe = wm8994_gpio_probe, |
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" ); |
308 | |