Root/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
29struct wm8994_gpio {
30    struct wm8994 *wm8994;
31    struct gpio_chip gpio_chip;
32};
33
34static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip)
35{
36    return container_of(chip, struct wm8994_gpio, gpio_chip);
37}
38
39static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
40{
41    struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
42    struct wm8994 *wm8994 = wm8994_gpio->wm8994;
43
44    switch (wm8994->type) {
45    case WM8958:
46        switch (offset) {
47        case 1:
48        case 2:
49        case 3:
50        case 4:
51        case 6:
52            return -EINVAL;
53        }
54        break;
55    default:
56        break;
57    }
58
59    return 0;
60}
61
62static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
63{
64    struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
65    struct wm8994 *wm8994 = wm8994_gpio->wm8994;
66
67    return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
68                   WM8994_GPN_DIR, WM8994_GPN_DIR);
69}
70
71static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
72{
73    struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
74    struct wm8994 *wm8994 = wm8994_gpio->wm8994;
75    int ret;
76
77    ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
78    if (ret < 0)
79        return ret;
80
81    if (ret & WM8994_GPN_LVL)
82        return 1;
83    else
84        return 0;
85}
86
87static int wm8994_gpio_direction_out(struct gpio_chip *chip,
88                     unsigned offset, int value)
89{
90    struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
91    struct wm8994 *wm8994 = wm8994_gpio->wm8994;
92
93    if (value)
94        value = WM8994_GPN_LVL;
95
96    return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
97                   WM8994_GPN_DIR | WM8994_GPN_LVL, value);
98}
99
100static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
101{
102    struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
103    struct wm8994 *wm8994 = wm8994_gpio->wm8994;
104
105    if (value)
106        value = WM8994_GPN_LVL;
107
108    wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
109}
110
111static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
112{
113    struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
114    struct wm8994 *wm8994 = wm8994_gpio->wm8994;
115
116    return regmap_irq_get_virq(wm8994->irq_data, offset);
117}
118
119
120#ifdef CONFIG_DEBUG_FS
121static const char *wm8994_gpio_fn(u16 fn)
122{
123    switch (fn) {
124    case WM8994_GP_FN_PIN_SPECIFIC:
125        return "pin-specific";
126    case WM8994_GP_FN_GPIO:
127        return "GPIO";
128    case WM8994_GP_FN_SDOUT:
129        return "SDOUT";
130    case WM8994_GP_FN_IRQ:
131        return "IRQ";
132    case WM8994_GP_FN_TEMPERATURE:
133        return "Temperature";
134    case WM8994_GP_FN_MICBIAS1_DET:
135        return "MICBIAS1 detect";
136    case WM8994_GP_FN_MICBIAS1_SHORT:
137        return "MICBIAS1 short";
138    case WM8994_GP_FN_MICBIAS2_DET:
139        return "MICBIAS2 detect";
140    case WM8994_GP_FN_MICBIAS2_SHORT:
141        return "MICBIAS2 short";
142    case WM8994_GP_FN_FLL1_LOCK:
143        return "FLL1 lock";
144    case WM8994_GP_FN_FLL2_LOCK:
145        return "FLL2 lock";
146    case WM8994_GP_FN_SRC1_LOCK:
147        return "SRC1 lock";
148    case WM8994_GP_FN_SRC2_LOCK:
149        return "SRC2 lock";
150    case WM8994_GP_FN_DRC1_ACT:
151        return "DRC1 activity";
152    case WM8994_GP_FN_DRC2_ACT:
153        return "DRC2 activity";
154    case WM8994_GP_FN_DRC3_ACT:
155        return "DRC3 activity";
156    case WM8994_GP_FN_WSEQ_STATUS:
157        return "Write sequencer";
158    case WM8994_GP_FN_FIFO_ERROR:
159        return "FIFO error";
160    case WM8994_GP_FN_OPCLK:
161        return "OPCLK";
162    case WM8994_GP_FN_THW:
163        return "Thermal warning";
164    case WM8994_GP_FN_DCS_DONE:
165        return "DC servo";
166    case WM8994_GP_FN_FLL1_OUT:
167        return "FLL1 output";
168    case WM8994_GP_FN_FLL2_OUT:
169        return "FLL1 output";
170    default:
171        return "Unknown";
172    }
173}
174
175static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
176{
177    struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
178    struct wm8994 *wm8994 = wm8994_gpio->wm8994;
179    int i;
180
181    for (i = 0; i < chip->ngpio; i++) {
182        int gpio = i + chip->base;
183        int reg;
184        const char *label;
185
186        /* We report the GPIO even if it's not requested since
187         * we're also reporting things like alternate
188         * functions which apply even when the GPIO is not in
189         * use as a GPIO.
190         */
191        label = gpiochip_is_requested(chip, i);
192        if (!label)
193            label = "Unrequested";
194
195        seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
196
197        reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
198        if (reg < 0) {
199            dev_err(wm8994->dev,
200                "GPIO control %d read failed: %d\n",
201                gpio, reg);
202            seq_printf(s, "\n");
203            continue;
204        }
205
206        if (reg & WM8994_GPN_DIR)
207            seq_printf(s, "in ");
208        else
209            seq_printf(s, "out ");
210
211        if (reg & WM8994_GPN_PU)
212            seq_printf(s, "pull up ");
213
214        if (reg & WM8994_GPN_PD)
215            seq_printf(s, "pull down ");
216
217        if (reg & WM8994_GPN_POL)
218            seq_printf(s, "inverted ");
219        else
220            seq_printf(s, "noninverted ");
221
222        if (reg & WM8994_GPN_OP_CFG)
223            seq_printf(s, "open drain ");
224        else
225            seq_printf(s, "CMOS ");
226
227        seq_printf(s, "%s (%x)\n",
228               wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
229    }
230}
231#else
232#define wm8994_gpio_dbg_show NULL
233#endif
234
235static struct gpio_chip template_chip = {
236    .label = "wm8994",
237    .owner = THIS_MODULE,
238    .request = wm8994_gpio_request,
239    .direction_input = wm8994_gpio_direction_in,
240    .get = wm8994_gpio_get,
241    .direction_output = wm8994_gpio_direction_out,
242    .set = wm8994_gpio_set,
243    .to_irq = wm8994_gpio_to_irq,
244    .dbg_show = wm8994_gpio_dbg_show,
245    .can_sleep = 1,
246};
247
248static int __devinit wm8994_gpio_probe(struct platform_device *pdev)
249{
250    struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
251    struct wm8994_pdata *pdata = wm8994->dev->platform_data;
252    struct wm8994_gpio *wm8994_gpio;
253    int ret;
254
255    wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
256                   GFP_KERNEL);
257    if (wm8994_gpio == NULL)
258        return -ENOMEM;
259
260    wm8994_gpio->wm8994 = wm8994;
261    wm8994_gpio->gpio_chip = template_chip;
262    wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
263    wm8994_gpio->gpio_chip.dev = &pdev->dev;
264    if (pdata && pdata->gpio_base)
265        wm8994_gpio->gpio_chip.base = pdata->gpio_base;
266    else
267        wm8994_gpio->gpio_chip.base = -1;
268
269    ret = gpiochip_add(&wm8994_gpio->gpio_chip);
270    if (ret < 0) {
271        dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
272            ret);
273        goto err;
274    }
275
276    platform_set_drvdata(pdev, wm8994_gpio);
277
278    return ret;
279
280err:
281    return ret;
282}
283
284static int __devexit wm8994_gpio_remove(struct platform_device *pdev)
285{
286    struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
287
288    return gpiochip_remove(&wm8994_gpio->gpio_chip);
289}
290
291static struct platform_driver wm8994_gpio_driver = {
292    .driver.name = "wm8994-gpio",
293    .driver.owner = THIS_MODULE,
294    .probe = wm8994_gpio_probe,
295    .remove = __devexit_p(wm8994_gpio_remove),
296};
297
298static int __init wm8994_gpio_init(void)
299{
300    return platform_driver_register(&wm8994_gpio_driver);
301}
302subsys_initcall(wm8994_gpio_init);
303
304static void __exit wm8994_gpio_exit(void)
305{
306    platform_driver_unregister(&wm8994_gpio_driver);
307}
308module_exit(wm8994_gpio_exit);
309
310MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
311MODULE_DESCRIPTION("GPIO interface for WM8994");
312MODULE_LICENSE("GPL");
313MODULE_ALIAS("platform:wm8994-gpio");
314

Archive Download this file

Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



interactive