Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[linux-2.6-microblaze.git] / drivers / gpio / gpio-wm8994.c
1 /*
2  * gpiolib support for Wolfson WM8994
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>
16 #include <linux/slab.h>
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>
22 #include <linux/regmap.h>
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
34 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
35 {
36         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
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
57 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
58 {
59         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
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 {
68         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
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 {
85         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
86         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
87
88         if (value)
89                 value = WM8994_GPN_LVL;
90
91         return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
92                                WM8994_GPN_DIR | WM8994_GPN_LVL, value);
93 }
94
95 static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
96 {
97         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
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
106 static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
107                                   unsigned long config)
108 {
109         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
110         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
111
112         switch (pinconf_to_config_param(config)) {
113         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
114                 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
115                                        WM8994_GPN_OP_CFG_MASK,
116                                        WM8994_GPN_OP_CFG);
117         case PIN_CONFIG_DRIVE_PUSH_PULL:
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
127 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
128 {
129         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
130         struct wm8994 *wm8994 = wm8994_gpio->wm8994;
131
132         return regmap_irq_get_virq(wm8994->irq_data, offset);
133 }
134
135
136 #ifdef CONFIG_DEBUG_FS
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
191 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
192 {
193         struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
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
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
241                         seq_printf(s, "push-pull ");
242
243                 seq_printf(s, "%s (%x)\n",
244                            wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
245         }
246 }
247 #else
248 #define wm8994_gpio_dbg_show NULL
249 #endif
250
251 static const struct gpio_chip template_chip = {
252         .label                  = "wm8994",
253         .owner                  = THIS_MODULE,
254         .request                = wm8994_gpio_request,
255         .direction_input        = wm8994_gpio_direction_in,
256         .get                    = wm8994_gpio_get,
257         .direction_output       = wm8994_gpio_direction_out,
258         .set                    = wm8994_gpio_set,
259         .set_config             = wm8994_gpio_set_config,
260         .to_irq                 = wm8994_gpio_to_irq,
261         .dbg_show               = wm8994_gpio_dbg_show,
262         .can_sleep              = true,
263 };
264
265 static int wm8994_gpio_probe(struct platform_device *pdev)
266 {
267         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
268         struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
269         struct wm8994_gpio *wm8994_gpio;
270         int ret;
271
272         wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
273                                    GFP_KERNEL);
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;
280         wm8994_gpio->gpio_chip.parent = &pdev->dev;
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
286         ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip,
287                                      wm8994_gpio);
288         if (ret < 0) {
289                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
290                         ret);
291                 return ret;
292         }
293
294         platform_set_drvdata(pdev, wm8994_gpio);
295
296         return ret;
297 }
298
299 static struct platform_driver wm8994_gpio_driver = {
300         .driver.name    = "wm8994-gpio",
301         .probe          = wm8994_gpio_probe,
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");