tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 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
57static 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
66static 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
82static 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
95static 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
106static 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
127static 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
137static 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
191static 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
251static 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
265static 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
299static struct platform_driver wm8994_gpio_driver = {
300 .driver.name = "wm8994-gpio",
301 .probe = wm8994_gpio_probe,
302};
303
304static int __init wm8994_gpio_init(void)
305{
306 return platform_driver_register(&wm8994_gpio_driver);
307}
308subsys_initcall(wm8994_gpio_init);
309
310static void __exit wm8994_gpio_exit(void)
311{
312 platform_driver_unregister(&wm8994_gpio_driver);
313}
314module_exit(wm8994_gpio_exit);
315
316MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
317MODULE_DESCRIPTION("GPIO interface for WM8994");
318MODULE_LICENSE("GPL");
319MODULE_ALIAS("platform:wm8994-gpio");