hwmon: (thmc50) Stop using I2C_CLIENT_MODULE_PARM
[linux-2.6.git] / drivers / gpio / wm831x-gpio.c
1 /*
2  * wm831x-gpio.c  --  gpiolib support for Wolfson WM831x PMICs
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/module.h>
17 #include <linux/gpio.h>
18 #include <linux/mfd/core.h>
19 #include <linux/platform_device.h>
20 #include <linux/seq_file.h>
21
22 #include <linux/mfd/wm831x/core.h>
23 #include <linux/mfd/wm831x/pdata.h>
24 #include <linux/mfd/wm831x/gpio.h>
25
26 #define WM831X_GPIO_MAX 16
27
28 struct wm831x_gpio {
29         struct wm831x *wm831x;
30         struct gpio_chip gpio_chip;
31 };
32
33 static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
34 {
35         return container_of(chip, struct wm831x_gpio, gpio_chip);
36 }
37
38 static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
39 {
40         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
41         struct wm831x *wm831x = wm831x_gpio->wm831x;
42
43         return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
44                                WM831X_GPN_DIR | WM831X_GPN_TRI,
45                                WM831X_GPN_DIR);
46 }
47
48 static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
49 {
50         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
51         struct wm831x *wm831x = wm831x_gpio->wm831x;
52         int ret;
53
54         ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
55         if (ret < 0)
56                 return ret;
57
58         if (ret & 1 << offset)
59                 return 1;
60         else
61                 return 0;
62 }
63
64 static int wm831x_gpio_direction_out(struct gpio_chip *chip,
65                                      unsigned offset, int value)
66 {
67         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
68         struct wm831x *wm831x = wm831x_gpio->wm831x;
69
70         return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
71                                WM831X_GPN_DIR | WM831X_GPN_TRI, 0);
72 }
73
74 static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
75 {
76         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
77         struct wm831x *wm831x = wm831x_gpio->wm831x;
78
79         wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
80                         value << offset);
81 }
82
83 #ifdef CONFIG_DEBUG_FS
84 static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
85 {
86         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
87         struct wm831x *wm831x = wm831x_gpio->wm831x;
88         int i;
89
90         for (i = 0; i < chip->ngpio; i++) {
91                 int gpio = i + chip->base;
92                 int reg;
93                 const char *label, *pull, *powerdomain;
94
95                 /* We report the GPIO even if it's not requested since
96                  * we're also reporting things like alternate
97                  * functions which apply even when the GPIO is not in
98                  * use as a GPIO.
99                  */
100                 label = gpiochip_is_requested(chip, i);
101                 if (!label)
102                         label = "Unrequested";
103
104                 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
105
106                 reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
107                 if (reg < 0) {
108                         dev_err(wm831x->dev,
109                                 "GPIO control %d read failed: %d\n",
110                                 gpio, reg);
111                         seq_printf(s, "\n");
112                         continue;
113                 }
114
115                 switch (reg & WM831X_GPN_PULL_MASK) {
116                 case WM831X_GPIO_PULL_NONE:
117                         pull = "nopull";
118                         break;
119                 case WM831X_GPIO_PULL_DOWN:
120                         pull = "pulldown";
121                         break;
122                 case WM831X_GPIO_PULL_UP:
123                         pull = "pullup";
124                 default:
125                         pull = "INVALID PULL";
126                         break;
127                 }
128
129                 switch (i + 1) {
130                 case 1 ... 3:
131                 case 7 ... 9:
132                         if (reg & WM831X_GPN_PWR_DOM)
133                                 powerdomain = "VPMIC";
134                         else
135                                 powerdomain = "DBVDD";
136                         break;
137
138                 case 4 ... 6:
139                 case 10 ... 12:
140                         if (reg & WM831X_GPN_PWR_DOM)
141                                 powerdomain = "SYSVDD";
142                         else
143                                 powerdomain = "DBVDD";
144                         break;
145
146                 case 13 ... 16:
147                         powerdomain = "TPVDD";
148                         break;
149
150                 default:
151                         BUG();
152                         break;
153                 }
154
155                 seq_printf(s, " %s %s %s %s%s\n"
156                            "                                  %s%s (0x%4x)\n",
157                            reg & WM831X_GPN_DIR ? "in" : "out",
158                            wm831x_gpio_get(chip, i) ? "high" : "low",
159                            pull,
160                            powerdomain,
161                            reg & WM831X_GPN_POL ? " inverted" : "",
162                            reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
163                            reg & WM831X_GPN_TRI ? " tristated" : "",
164                            reg);
165         }
166 }
167 #else
168 #define wm831x_gpio_dbg_show NULL
169 #endif
170
171 static struct gpio_chip template_chip = {
172         .label                  = "wm831x",
173         .owner                  = THIS_MODULE,
174         .direction_input        = wm831x_gpio_direction_in,
175         .get                    = wm831x_gpio_get,
176         .direction_output       = wm831x_gpio_direction_out,
177         .set                    = wm831x_gpio_set,
178         .dbg_show               = wm831x_gpio_dbg_show,
179         .can_sleep              = 1,
180 };
181
182 static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
183 {
184         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
185         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
186         struct wm831x_gpio *wm831x_gpio;
187         int ret;
188
189         wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
190         if (wm831x_gpio == NULL)
191                 return -ENOMEM;
192
193         wm831x_gpio->wm831x = wm831x;
194         wm831x_gpio->gpio_chip = template_chip;
195         wm831x_gpio->gpio_chip.ngpio = WM831X_GPIO_MAX;
196         wm831x_gpio->gpio_chip.dev = &pdev->dev;
197         if (pdata && pdata->gpio_base)
198                 wm831x_gpio->gpio_chip.base = pdata->gpio_base;
199         else
200                 wm831x_gpio->gpio_chip.base = -1;
201
202         ret = gpiochip_add(&wm831x_gpio->gpio_chip);
203         if (ret < 0) {
204                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
205                         ret);
206                 goto err;
207         }
208
209         platform_set_drvdata(pdev, wm831x_gpio);
210
211         return ret;
212
213 err:
214         kfree(wm831x_gpio);
215         return ret;
216 }
217
218 static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
219 {
220         struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
221         int ret;
222
223         ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
224         if (ret == 0)
225                 kfree(wm831x_gpio);
226
227         return ret;
228 }
229
230 static struct platform_driver wm831x_gpio_driver = {
231         .driver.name    = "wm831x-gpio",
232         .driver.owner   = THIS_MODULE,
233         .probe          = wm831x_gpio_probe,
234         .remove         = __devexit_p(wm831x_gpio_remove),
235 };
236
237 static int __init wm831x_gpio_init(void)
238 {
239         return platform_driver_register(&wm831x_gpio_driver);
240 }
241 subsys_initcall(wm831x_gpio_init);
242
243 static void __exit wm831x_gpio_exit(void)
244 {
245         platform_driver_unregister(&wm831x_gpio_driver);
246 }
247 module_exit(wm831x_gpio_exit);
248
249 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
250 MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
251 MODULE_LICENSE("GPL");
252 MODULE_ALIAS("platform:wm831x-gpio");