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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
Linus Walleij190ea432016-04-10 15:07:23 +0200106static int wm8994_gpio_set_single_ended(struct gpio_chip *chip,
107 unsigned int offset,
108 enum single_ended_mode mode)
109{
110 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
111 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
112
113 switch (mode) {
114 case LINE_MODE_OPEN_DRAIN:
115 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
116 WM8994_GPN_OP_CFG_MASK,
117 WM8994_GPN_OP_CFG);
118 case LINE_MODE_PUSH_PULL:
119 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
120 WM8994_GPN_OP_CFG_MASK, 0);
121 default:
122 break;
123 }
124
125 return -ENOTSUPP;
126}
127
Mark Brownddf438c2010-04-02 14:51:59 +0100128static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
129{
Linus Walleij765aa582015-12-07 15:15:30 +0100130 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brownddf438c2010-04-02 14:51:59 +0100131 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
132
Mark Brown224a1f92012-06-03 13:40:19 +0100133 return regmap_irq_get_virq(wm8994->irq_data, offset);
Mark Brownddf438c2010-04-02 14:51:59 +0100134}
135
136
Mark Brown2955c302010-01-29 18:20:30 +0000137#ifdef CONFIG_DEBUG_FS
Mark Brownd0ad5e82011-12-08 00:24:01 +0800138static const char *wm8994_gpio_fn(u16 fn)
139{
140 switch (fn) {
141 case WM8994_GP_FN_PIN_SPECIFIC:
142 return "pin-specific";
143 case WM8994_GP_FN_GPIO:
144 return "GPIO";
145 case WM8994_GP_FN_SDOUT:
146 return "SDOUT";
147 case WM8994_GP_FN_IRQ:
148 return "IRQ";
149 case WM8994_GP_FN_TEMPERATURE:
150 return "Temperature";
151 case WM8994_GP_FN_MICBIAS1_DET:
152 return "MICBIAS1 detect";
153 case WM8994_GP_FN_MICBIAS1_SHORT:
154 return "MICBIAS1 short";
155 case WM8994_GP_FN_MICBIAS2_DET:
156 return "MICBIAS2 detect";
157 case WM8994_GP_FN_MICBIAS2_SHORT:
158 return "MICBIAS2 short";
159 case WM8994_GP_FN_FLL1_LOCK:
160 return "FLL1 lock";
161 case WM8994_GP_FN_FLL2_LOCK:
162 return "FLL2 lock";
163 case WM8994_GP_FN_SRC1_LOCK:
164 return "SRC1 lock";
165 case WM8994_GP_FN_SRC2_LOCK:
166 return "SRC2 lock";
167 case WM8994_GP_FN_DRC1_ACT:
168 return "DRC1 activity";
169 case WM8994_GP_FN_DRC2_ACT:
170 return "DRC2 activity";
171 case WM8994_GP_FN_DRC3_ACT:
172 return "DRC3 activity";
173 case WM8994_GP_FN_WSEQ_STATUS:
174 return "Write sequencer";
175 case WM8994_GP_FN_FIFO_ERROR:
176 return "FIFO error";
177 case WM8994_GP_FN_OPCLK:
178 return "OPCLK";
179 case WM8994_GP_FN_THW:
180 return "Thermal warning";
181 case WM8994_GP_FN_DCS_DONE:
182 return "DC servo";
183 case WM8994_GP_FN_FLL1_OUT:
184 return "FLL1 output";
185 case WM8994_GP_FN_FLL2_OUT:
186 return "FLL1 output";
187 default:
188 return "Unknown";
189 }
190}
191
Mark Brown2955c302010-01-29 18:20:30 +0000192static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
193{
Linus Walleij765aa582015-12-07 15:15:30 +0100194 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
Mark Brown2955c302010-01-29 18:20:30 +0000195 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
196 int i;
197
198 for (i = 0; i < chip->ngpio; i++) {
199 int gpio = i + chip->base;
200 int reg;
201 const char *label;
202
203 /* We report the GPIO even if it's not requested since
204 * we're also reporting things like alternate
205 * functions which apply even when the GPIO is not in
206 * use as a GPIO.
207 */
208 label = gpiochip_is_requested(chip, i);
209 if (!label)
210 label = "Unrequested";
211
212 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
213
214 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
215 if (reg < 0) {
216 dev_err(wm8994->dev,
217 "GPIO control %d read failed: %d\n",
218 gpio, reg);
219 seq_printf(s, "\n");
220 continue;
221 }
222
Mark Brownd0ad5e82011-12-08 00:24:01 +0800223 if (reg & WM8994_GPN_DIR)
224 seq_printf(s, "in ");
225 else
226 seq_printf(s, "out ");
227
228 if (reg & WM8994_GPN_PU)
229 seq_printf(s, "pull up ");
230
231 if (reg & WM8994_GPN_PD)
232 seq_printf(s, "pull down ");
233
234 if (reg & WM8994_GPN_POL)
235 seq_printf(s, "inverted ");
236 else
237 seq_printf(s, "noninverted ");
238
239 if (reg & WM8994_GPN_OP_CFG)
240 seq_printf(s, "open drain ");
241 else
Linus Walleij190ea432016-04-10 15:07:23 +0200242 seq_printf(s, "push-pull ");
Mark Brownd0ad5e82011-12-08 00:24:01 +0800243
244 seq_printf(s, "%s (%x)\n",
245 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
Mark Brown2955c302010-01-29 18:20:30 +0000246 }
247}
248#else
249#define wm8994_gpio_dbg_show NULL
250#endif
251
Julia Lawalle35b5ab2016-09-11 14:14:37 +0200252static const struct gpio_chip template_chip = {
Mark Brown2955c302010-01-29 18:20:30 +0000253 .label = "wm8994",
254 .owner = THIS_MODULE,
Mark Brown4b666722010-09-01 10:47:16 +0100255 .request = wm8994_gpio_request,
Mark Brown2955c302010-01-29 18:20:30 +0000256 .direction_input = wm8994_gpio_direction_in,
257 .get = wm8994_gpio_get,
258 .direction_output = wm8994_gpio_direction_out,
259 .set = wm8994_gpio_set,
Linus Walleij190ea432016-04-10 15:07:23 +0200260 .set_single_ended = wm8994_gpio_set_single_ended,
Mark Browndeb26e92010-08-17 13:13:37 +0100261 .to_irq = wm8994_gpio_to_irq,
Mark Brown2955c302010-01-29 18:20:30 +0000262 .dbg_show = wm8994_gpio_dbg_show,
Linus Walleij9fb1f392013-12-04 14:42:46 +0100263 .can_sleep = true,
Mark Brown2955c302010-01-29 18:20:30 +0000264};
265
Bill Pemberton38363092012-11-19 13:22:34 -0500266static int wm8994_gpio_probe(struct platform_device *pdev)
Mark Brown2955c302010-01-29 18:20:30 +0000267{
268 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
Jingoo Hane56aee12013-07-30 17:08:05 +0900269 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
Mark Brown2955c302010-01-29 18:20:30 +0000270 struct wm8994_gpio *wm8994_gpio;
271 int ret;
272
Mark Brownf8d203c2012-06-05 17:22:09 +0100273 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
274 GFP_KERNEL);
Mark Brown2955c302010-01-29 18:20:30 +0000275 if (wm8994_gpio == NULL)
276 return -ENOMEM;
277
278 wm8994_gpio->wm8994 = wm8994;
279 wm8994_gpio->gpio_chip = template_chip;
280 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
Linus Walleij58383c72015-11-04 09:56:26 +0100281 wm8994_gpio->gpio_chip.parent = &pdev->dev;
Mark Brown2955c302010-01-29 18:20:30 +0000282 if (pdata && pdata->gpio_base)
283 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
284 else
285 wm8994_gpio->gpio_chip.base = -1;
286
Laxman Dewanganc87dc4e2016-02-22 17:43:28 +0530287 ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip,
288 wm8994_gpio);
Mark Brown2955c302010-01-29 18:20:30 +0000289 if (ret < 0) {
290 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
291 ret);
Laxman Dewanganc87dc4e2016-02-22 17:43:28 +0530292 return ret;
Mark Brown2955c302010-01-29 18:20:30 +0000293 }
294
295 platform_set_drvdata(pdev, wm8994_gpio);
296
297 return ret;
Mark Brown2955c302010-01-29 18:20:30 +0000298}
299
300static struct platform_driver wm8994_gpio_driver = {
301 .driver.name = "wm8994-gpio",
Mark Brown2955c302010-01-29 18:20:30 +0000302 .probe = wm8994_gpio_probe,
Mark Brown2955c302010-01-29 18:20:30 +0000303};
304
305static int __init wm8994_gpio_init(void)
306{
307 return platform_driver_register(&wm8994_gpio_driver);
308}
309subsys_initcall(wm8994_gpio_init);
310
311static void __exit wm8994_gpio_exit(void)
312{
313 platform_driver_unregister(&wm8994_gpio_driver);
314}
315module_exit(wm8994_gpio_exit);
316
317MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
318MODULE_DESCRIPTION("GPIO interface for WM8994");
319MODULE_LICENSE("GPL");
320MODULE_ALIAS("platform:wm8994-gpio");