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Mark Brown2955c302010-01-29 18:20:30 +00001/*
Grant Likelyc103de22011-06-04 18:38:28 -06002 * gpiolib support for Wolfson WM8994
Mark Brown2955c302010-01-29 18:20:30 +00003 *
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Mark Brown2955c302010-01-29 18:20:30 +000017#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>
Mark Brown224a1f92012-06-03 13:40:19 +010022#include <linux/regmap.h>
Mark Brown2955c302010-01-29 18:20:30 +000023
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
Mark Brown4b666722010-09-01 10:47:16 +010034static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
35{
Linus Walleij765aa582015-12-07 15:15:30 +010036 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brown4b666722010-09-01 10:47:16 +010037 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
Mark Brown2955c302010-01-29 18:20:30 +000057static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
58{
Linus Walleij765aa582015-12-07 15:15:30 +010059 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brown2955c302010-01-29 18:20:30 +000060 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
66static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
67{
Linus Walleij765aa582015-12-07 15:15:30 +010068 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brown2955c302010-01-29 18:20:30 +000069 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
82static int wm8994_gpio_direction_out(struct gpio_chip *chip,
83 unsigned offset, int value)
84{
Linus Walleij765aa582015-12-07 15:15:30 +010085 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brown2955c302010-01-29 18:20:30 +000086 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
87
Mark Brown8cd578b2012-06-09 11:07:56 +080088 if (value)
89 value = WM8994_GPN_LVL;
90
Mark Brown2955c302010-01-29 18:20:30 +000091 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
Mark Brown8cd578b2012-06-09 11:07:56 +080092 WM8994_GPN_DIR | WM8994_GPN_LVL, value);
Mark Brown2955c302010-01-29 18:20:30 +000093}
94
95static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
96{
Linus Walleij765aa582015-12-07 15:15:30 +010097 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brown2955c302010-01-29 18:20:30 +000098 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
Mark Brownddf438c2010-04-02 14:51:59 +0100106static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
107{
Linus Walleij765aa582015-12-07 15:15:30 +0100108 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brownddf438c2010-04-02 14:51:59 +0100109 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
110
Mark Brown224a1f92012-06-03 13:40:19 +0100111 return regmap_irq_get_virq(wm8994->irq_data, offset);
Mark Brownddf438c2010-04-02 14:51:59 +0100112}
113
114
Mark Brown2955c302010-01-29 18:20:30 +0000115#ifdef CONFIG_DEBUG_FS
Mark Brownd0ad5e82011-12-08 00:24:01 +0800116static const char *wm8994_gpio_fn(u16 fn)
117{
118 switch (fn) {
119 case WM8994_GP_FN_PIN_SPECIFIC:
120 return "pin-specific";
121 case WM8994_GP_FN_GPIO:
122 return "GPIO";
123 case WM8994_GP_FN_SDOUT:
124 return "SDOUT";
125 case WM8994_GP_FN_IRQ:
126 return "IRQ";
127 case WM8994_GP_FN_TEMPERATURE:
128 return "Temperature";
129 case WM8994_GP_FN_MICBIAS1_DET:
130 return "MICBIAS1 detect";
131 case WM8994_GP_FN_MICBIAS1_SHORT:
132 return "MICBIAS1 short";
133 case WM8994_GP_FN_MICBIAS2_DET:
134 return "MICBIAS2 detect";
135 case WM8994_GP_FN_MICBIAS2_SHORT:
136 return "MICBIAS2 short";
137 case WM8994_GP_FN_FLL1_LOCK:
138 return "FLL1 lock";
139 case WM8994_GP_FN_FLL2_LOCK:
140 return "FLL2 lock";
141 case WM8994_GP_FN_SRC1_LOCK:
142 return "SRC1 lock";
143 case WM8994_GP_FN_SRC2_LOCK:
144 return "SRC2 lock";
145 case WM8994_GP_FN_DRC1_ACT:
146 return "DRC1 activity";
147 case WM8994_GP_FN_DRC2_ACT:
148 return "DRC2 activity";
149 case WM8994_GP_FN_DRC3_ACT:
150 return "DRC3 activity";
151 case WM8994_GP_FN_WSEQ_STATUS:
152 return "Write sequencer";
153 case WM8994_GP_FN_FIFO_ERROR:
154 return "FIFO error";
155 case WM8994_GP_FN_OPCLK:
156 return "OPCLK";
157 case WM8994_GP_FN_THW:
158 return "Thermal warning";
159 case WM8994_GP_FN_DCS_DONE:
160 return "DC servo";
161 case WM8994_GP_FN_FLL1_OUT:
162 return "FLL1 output";
163 case WM8994_GP_FN_FLL2_OUT:
164 return "FLL1 output";
165 default:
166 return "Unknown";
167 }
168}
169
Mark Brown2955c302010-01-29 18:20:30 +0000170static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
171{
Linus Walleij765aa582015-12-07 15:15:30 +0100172 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brown2955c302010-01-29 18:20:30 +0000173 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
174 int i;
175
176 for (i = 0; i < chip->ngpio; i++) {
177 int gpio = i + chip->base;
178 int reg;
179 const char *label;
180
181 /* We report the GPIO even if it's not requested since
182 * we're also reporting things like alternate
183 * functions which apply even when the GPIO is not in
184 * use as a GPIO.
185 */
186 label = gpiochip_is_requested(chip, i);
187 if (!label)
188 label = "Unrequested";
189
190 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
191
192 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
193 if (reg < 0) {
194 dev_err(wm8994->dev,
195 "GPIO control %d read failed: %d\n",
196 gpio, reg);
197 seq_printf(s, "\n");
198 continue;
199 }
200
Mark Brownd0ad5e82011-12-08 00:24:01 +0800201 if (reg & WM8994_GPN_DIR)
202 seq_printf(s, "in ");
203 else
204 seq_printf(s, "out ");
205
206 if (reg & WM8994_GPN_PU)
207 seq_printf(s, "pull up ");
208
209 if (reg & WM8994_GPN_PD)
210 seq_printf(s, "pull down ");
211
212 if (reg & WM8994_GPN_POL)
213 seq_printf(s, "inverted ");
214 else
215 seq_printf(s, "noninverted ");
216
217 if (reg & WM8994_GPN_OP_CFG)
218 seq_printf(s, "open drain ");
219 else
220 seq_printf(s, "CMOS ");
221
222 seq_printf(s, "%s (%x)\n",
223 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
Mark Brown2955c302010-01-29 18:20:30 +0000224 }
225}
226#else
227#define wm8994_gpio_dbg_show NULL
228#endif
229
230static struct gpio_chip template_chip = {
231 .label = "wm8994",
232 .owner = THIS_MODULE,
Mark Brown4b666722010-09-01 10:47:16 +0100233 .request = wm8994_gpio_request,
Mark Brown2955c302010-01-29 18:20:30 +0000234 .direction_input = wm8994_gpio_direction_in,
235 .get = wm8994_gpio_get,
236 .direction_output = wm8994_gpio_direction_out,
237 .set = wm8994_gpio_set,
Mark Browndeb26e92010-08-17 13:13:37 +0100238 .to_irq = wm8994_gpio_to_irq,
Mark Brown2955c302010-01-29 18:20:30 +0000239 .dbg_show = wm8994_gpio_dbg_show,
Linus Walleij9fb1f392013-12-04 14:42:46 +0100240 .can_sleep = true,
Mark Brown2955c302010-01-29 18:20:30 +0000241};
242
Bill Pemberton38363092012-11-19 13:22:34 -0500243static int wm8994_gpio_probe(struct platform_device *pdev)
Mark Brown2955c302010-01-29 18:20:30 +0000244{
245 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
Jingoo Hane56aee12013-07-30 17:08:05 +0900246 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
Mark Brown2955c302010-01-29 18:20:30 +0000247 struct wm8994_gpio *wm8994_gpio;
248 int ret;
249
Mark Brownf8d203c2012-06-05 17:22:09 +0100250 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
251 GFP_KERNEL);
Mark Brown2955c302010-01-29 18:20:30 +0000252 if (wm8994_gpio == NULL)
253 return -ENOMEM;
254
255 wm8994_gpio->wm8994 = wm8994;
256 wm8994_gpio->gpio_chip = template_chip;
257 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
Linus Walleij58383c72015-11-04 09:56:26 +0100258 wm8994_gpio->gpio_chip.parent = &pdev->dev;
Mark Brown2955c302010-01-29 18:20:30 +0000259 if (pdata && pdata->gpio_base)
260 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
261 else
262 wm8994_gpio->gpio_chip.base = -1;
263
Linus Walleij765aa582015-12-07 15:15:30 +0100264 ret = gpiochip_add_data(&wm8994_gpio->gpio_chip, wm8994_gpio);
Mark Brown2955c302010-01-29 18:20:30 +0000265 if (ret < 0) {
266 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
267 ret);
268 goto err;
269 }
270
271 platform_set_drvdata(pdev, wm8994_gpio);
272
273 return ret;
274
275err:
Mark Brown2955c302010-01-29 18:20:30 +0000276 return ret;
277}
278
Bill Pemberton206210c2012-11-19 13:25:50 -0500279static int wm8994_gpio_remove(struct platform_device *pdev)
Mark Brown2955c302010-01-29 18:20:30 +0000280{
281 struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
Mark Brown2955c302010-01-29 18:20:30 +0000282
abdoulaye berthe9f5132a2014-07-12 22:30:12 +0200283 gpiochip_remove(&wm8994_gpio->gpio_chip);
284 return 0;
Mark Brown2955c302010-01-29 18:20:30 +0000285}
286
287static struct platform_driver wm8994_gpio_driver = {
288 .driver.name = "wm8994-gpio",
289 .driver.owner = THIS_MODULE,
290 .probe = wm8994_gpio_probe,
Bill Pemberton8283c4f2012-11-19 13:20:08 -0500291 .remove = wm8994_gpio_remove,
Mark Brown2955c302010-01-29 18:20:30 +0000292};
293
294static int __init wm8994_gpio_init(void)
295{
296 return platform_driver_register(&wm8994_gpio_driver);
297}
298subsys_initcall(wm8994_gpio_init);
299
300static void __exit wm8994_gpio_exit(void)
301{
302 platform_driver_unregister(&wm8994_gpio_driver);
303}
304module_exit(wm8994_gpio_exit);
305
306MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
307MODULE_DESCRIPTION("GPIO interface for WM8994");
308MODULE_LICENSE("GPL");
309MODULE_ALIAS("platform:wm8994-gpio");