GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / gpio / gpio-wm8994.c
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/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/gpio/driver.h>
15 #include <linux/mfd/core.h>
16 #include <linux/platform_device.h>
17 #include <linux/seq_file.h>
18 #include <linux/regmap.h>
19
20 #include <linux/mfd/wm8994/core.h>
21 #include <linux/mfd/wm8994/pdata.h>
22 #include <linux/mfd/wm8994/gpio.h>
23 #include <linux/mfd/wm8994/registers.h>
24
25 struct wm8994_gpio {
26         struct wm8994 *wm8994;
27         struct gpio_chip gpio_chip;
28 };
29
30 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
31 {
32         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
33         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
34
35         switch (wm8994->type) {
36         case WM8958:
37                 switch (offset) {
38                 case 1:
39                 case 2:
40                 case 3:
41                 case 4:
42                 case 6:
43                         return -EINVAL;
44                 }
45                 break;
46         default:
47                 break;
48         }
49
50         return 0;
51 }
52
53 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
54 {
55         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
56         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
57
58         return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
59                                WM8994_GPN_DIR, WM8994_GPN_DIR);
60 }
61
62 static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
63 {
64         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
65         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
66         int ret;
67
68         ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
69         if (ret < 0)
70                 return ret;
71
72         if (ret & WM8994_GPN_LVL)
73                 return 1;
74         else
75                 return 0;
76 }
77
78 static int wm8994_gpio_direction_out(struct gpio_chip *chip,
79                                      unsigned offset, int value)
80 {
81         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
82         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
83
84         if (value)
85                 value = WM8994_GPN_LVL;
86
87         return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
88                                WM8994_GPN_DIR | WM8994_GPN_LVL, value);
89 }
90
91 static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
92 {
93         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
94         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
95
96         if (value)
97                 value = WM8994_GPN_LVL;
98
99         wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
100 }
101
102 static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
103                                   unsigned long config)
104 {
105         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
106         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
107
108         switch (pinconf_to_config_param(config)) {
109         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
110                 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
111                                        WM8994_GPN_OP_CFG_MASK,
112                                        WM8994_GPN_OP_CFG);
113         case PIN_CONFIG_DRIVE_PUSH_PULL:
114                 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
115                                        WM8994_GPN_OP_CFG_MASK, 0);
116         default:
117                 break;
118         }
119
120         return -ENOTSUPP;
121 }
122
123 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
124 {
125         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
126         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
127
128         return regmap_irq_get_virq(wm8994->irq_data, offset);
129 }
130
131
132 #ifdef CONFIG_DEBUG_FS
133 static const char *wm8994_gpio_fn(u16 fn)
134 {
135         switch (fn) {
136         case WM8994_GP_FN_PIN_SPECIFIC:
137                 return "pin-specific";
138         case WM8994_GP_FN_GPIO:
139                 return "GPIO";
140         case WM8994_GP_FN_SDOUT:
141                 return "SDOUT";
142         case WM8994_GP_FN_IRQ:
143                 return "IRQ";
144         case WM8994_GP_FN_TEMPERATURE:
145                 return "Temperature";
146         case WM8994_GP_FN_MICBIAS1_DET:
147                 return "MICBIAS1 detect";
148         case WM8994_GP_FN_MICBIAS1_SHORT:
149                 return "MICBIAS1 short";
150         case WM8994_GP_FN_MICBIAS2_DET:
151                 return "MICBIAS2 detect";
152         case WM8994_GP_FN_MICBIAS2_SHORT:
153                 return "MICBIAS2 short";
154         case WM8994_GP_FN_FLL1_LOCK:
155                 return "FLL1 lock";
156         case WM8994_GP_FN_FLL2_LOCK:
157                 return "FLL2 lock";
158         case WM8994_GP_FN_SRC1_LOCK:
159                 return "SRC1 lock";
160         case WM8994_GP_FN_SRC2_LOCK:
161                 return "SRC2 lock";
162         case WM8994_GP_FN_DRC1_ACT:
163                 return "DRC1 activity";
164         case WM8994_GP_FN_DRC2_ACT:
165                 return "DRC2 activity";
166         case WM8994_GP_FN_DRC3_ACT:
167                 return "DRC3 activity";
168         case WM8994_GP_FN_WSEQ_STATUS:
169                 return "Write sequencer";
170         case WM8994_GP_FN_FIFO_ERROR:
171                 return "FIFO error";
172         case WM8994_GP_FN_OPCLK:
173                 return "OPCLK";
174         case WM8994_GP_FN_THW:
175                 return "Thermal warning";
176         case WM8994_GP_FN_DCS_DONE:
177                 return "DC servo";
178         case WM8994_GP_FN_FLL1_OUT:
179                 return "FLL1 output";
180         case WM8994_GP_FN_FLL2_OUT:
181                 return "FLL1 output";
182         default:
183                 return "Unknown";
184         }
185 }
186
187 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
188 {
189         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
190         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
191         int i;
192
193         for (i = 0; i < chip->ngpio; i++) {
194                 int gpio = i + chip->base;
195                 int reg;
196                 const char *label;
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                 label = gpiochip_is_requested(chip, i);
204                 if (!label)
205                         label = "Unrequested";
206
207                 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
208
209                 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
210                 if (reg < 0) {
211                         dev_err(wm8994->dev,
212                                 "GPIO control %d read failed: %d\n",
213                                 gpio, reg);
214                         seq_printf(s, "\n");
215                         continue;
216                 }
217
218                 if (reg & WM8994_GPN_DIR)
219                         seq_printf(s, "in ");
220                 else
221                         seq_printf(s, "out ");
222
223                 if (reg & WM8994_GPN_PU)
224                         seq_printf(s, "pull up ");
225
226                 if (reg & WM8994_GPN_PD)
227                         seq_printf(s, "pull down ");
228
229                 if (reg & WM8994_GPN_POL)
230                         seq_printf(s, "inverted ");
231                 else
232                         seq_printf(s, "noninverted ");
233
234                 if (reg & WM8994_GPN_OP_CFG)
235                         seq_printf(s, "open drain ");
236                 else
237                         seq_printf(s, "push-pull ");
238
239                 seq_printf(s, "%s (%x)\n",
240                            wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
241         }
242 }
243 #else
244 #define wm8994_gpio_dbg_show NULL
245 #endif
246
247 static const struct gpio_chip template_chip = {
248         .label                  = "wm8994",
249         .owner                  = THIS_MODULE,
250         .request                = wm8994_gpio_request,
251         .direction_input        = wm8994_gpio_direction_in,
252         .get                    = wm8994_gpio_get,
253         .direction_output       = wm8994_gpio_direction_out,
254         .set                    = wm8994_gpio_set,
255         .set_config             = wm8994_gpio_set_config,
256         .to_irq                 = wm8994_gpio_to_irq,
257         .dbg_show               = wm8994_gpio_dbg_show,
258         .can_sleep              = true,
259 };
260
261 static int wm8994_gpio_probe(struct platform_device *pdev)
262 {
263         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
264         struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
265         struct wm8994_gpio *wm8994_gpio;
266
267         wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
268                                    GFP_KERNEL);
269         if (wm8994_gpio == NULL)
270                 return -ENOMEM;
271
272         wm8994_gpio->wm8994 = wm8994;
273         wm8994_gpio->gpio_chip = template_chip;
274         wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
275         wm8994_gpio->gpio_chip.parent = &pdev->dev;
276         if (pdata && pdata->gpio_base)
277                 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
278         else
279                 wm8994_gpio->gpio_chip.base = -1;
280
281         return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
282 }
283
284 static struct platform_driver wm8994_gpio_driver = {
285         .driver.name    = "wm8994-gpio",
286         .probe          = wm8994_gpio_probe,
287 };
288
289 static int __init wm8994_gpio_init(void)
290 {
291         return platform_driver_register(&wm8994_gpio_driver);
292 }
293 subsys_initcall(wm8994_gpio_init);
294
295 static void __exit wm8994_gpio_exit(void)
296 {
297         platform_driver_unregister(&wm8994_gpio_driver);
298 }
299 module_exit(wm8994_gpio_exit);
300
301 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
302 MODULE_DESCRIPTION("GPIO interface for WM8994");
303 MODULE_LICENSE("GPL");
304 MODULE_ALIAS("platform:wm8994-gpio");