tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * gpiolib support for Wolfson WM8994
4 *
5 * Copyright 2009 Wolfson Microelectronics PLC.
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 *
9 */
10
11#include <linux/cleanup.h>
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/module.h>
15#include <linux/gpio/driver.h>
16#include <linux/mfd/core.h>
17#include <linux/platform_device.h>
18#include <linux/seq_file.h>
19#include <linux/regmap.h>
20
21#include <linux/mfd/wm8994/core.h>
22#include <linux/mfd/wm8994/pdata.h>
23#include <linux/mfd/wm8994/gpio.h>
24#include <linux/mfd/wm8994/registers.h>
25
26struct wm8994_gpio {
27 struct wm8994 *wm8994;
28 struct gpio_chip gpio_chip;
29};
30
31static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
32{
33 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
34 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
35
36 switch (wm8994->type) {
37 case WM8958:
38 switch (offset) {
39 case 1:
40 case 2:
41 case 3:
42 case 4:
43 case 6:
44 return -EINVAL;
45 }
46 break;
47 default:
48 break;
49 }
50
51 return 0;
52}
53
54static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
55{
56 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
57 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
58
59 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
60 WM8994_GPN_DIR, WM8994_GPN_DIR);
61}
62
63static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
64{
65 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
66 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
67 int ret;
68
69 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
70 if (ret < 0)
71 return ret;
72
73 if (ret & WM8994_GPN_LVL)
74 return 1;
75 else
76 return 0;
77}
78
79static int wm8994_gpio_direction_out(struct gpio_chip *chip,
80 unsigned offset, int value)
81{
82 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
83 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
84
85 if (value)
86 value = WM8994_GPN_LVL;
87
88 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
89 WM8994_GPN_DIR | WM8994_GPN_LVL, value);
90}
91
92static int wm8994_gpio_set(struct gpio_chip *chip, unsigned int offset,
93 int value)
94{
95 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
96 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
97
98 if (value)
99 value = WM8994_GPN_LVL;
100
101 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL,
102 value);
103}
104
105static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
106 unsigned long config)
107{
108 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
109 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
110
111 switch (pinconf_to_config_param(config)) {
112 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
113 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
114 WM8994_GPN_OP_CFG_MASK,
115 WM8994_GPN_OP_CFG);
116 case PIN_CONFIG_DRIVE_PUSH_PULL:
117 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
118 WM8994_GPN_OP_CFG_MASK, 0);
119 default:
120 break;
121 }
122
123 return -ENOTSUPP;
124}
125
126static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
127{
128 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
129 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
130
131 return regmap_irq_get_virq(wm8994->irq_data, offset);
132}
133
134
135#ifdef CONFIG_DEBUG_FS
136static const char *wm8994_gpio_fn(u16 fn)
137{
138 switch (fn) {
139 case WM8994_GP_FN_PIN_SPECIFIC:
140 return "pin-specific";
141 case WM8994_GP_FN_GPIO:
142 return "GPIO";
143 case WM8994_GP_FN_SDOUT:
144 return "SDOUT";
145 case WM8994_GP_FN_IRQ:
146 return "IRQ";
147 case WM8994_GP_FN_TEMPERATURE:
148 return "Temperature";
149 case WM8994_GP_FN_MICBIAS1_DET:
150 return "MICBIAS1 detect";
151 case WM8994_GP_FN_MICBIAS1_SHORT:
152 return "MICBIAS1 short";
153 case WM8994_GP_FN_MICBIAS2_DET:
154 return "MICBIAS2 detect";
155 case WM8994_GP_FN_MICBIAS2_SHORT:
156 return "MICBIAS2 short";
157 case WM8994_GP_FN_FLL1_LOCK:
158 return "FLL1 lock";
159 case WM8994_GP_FN_FLL2_LOCK:
160 return "FLL2 lock";
161 case WM8994_GP_FN_SRC1_LOCK:
162 return "SRC1 lock";
163 case WM8994_GP_FN_SRC2_LOCK:
164 return "SRC2 lock";
165 case WM8994_GP_FN_DRC1_ACT:
166 return "DRC1 activity";
167 case WM8994_GP_FN_DRC2_ACT:
168 return "DRC2 activity";
169 case WM8994_GP_FN_DRC3_ACT:
170 return "DRC3 activity";
171 case WM8994_GP_FN_WSEQ_STATUS:
172 return "Write sequencer";
173 case WM8994_GP_FN_FIFO_ERROR:
174 return "FIFO error";
175 case WM8994_GP_FN_OPCLK:
176 return "OPCLK";
177 case WM8994_GP_FN_THW:
178 return "Thermal warning";
179 case WM8994_GP_FN_DCS_DONE:
180 return "DC servo";
181 case WM8994_GP_FN_FLL1_OUT:
182 return "FLL1 output";
183 case WM8994_GP_FN_FLL2_OUT:
184 return "FLL1 output";
185 default:
186 return "Unknown";
187 }
188}
189
190static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
191{
192 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
193 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
194 int i;
195
196 for (i = 0; i < chip->ngpio; i++) {
197 int gpio = i + chip->base;
198 int reg;
199
200 /* We report the GPIO even if it's not requested since
201 * we're also reporting things like alternate
202 * functions which apply even when the GPIO is not in
203 * use as a GPIO.
204 */
205 char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
206 if (IS_ERR(label)) {
207 dev_err(wm8994->dev, "Failed to duplicate label\n");
208 continue;
209 }
210
211 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio,
212 label ?: "Unrequested");
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
223 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
242 seq_printf(s, "push-pull ");
243
244 seq_printf(s, "%s (%x)\n",
245 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
246 }
247}
248#else
249#define wm8994_gpio_dbg_show NULL
250#endif
251
252static const struct gpio_chip template_chip = {
253 .label = "wm8994",
254 .owner = THIS_MODULE,
255 .request = wm8994_gpio_request,
256 .direction_input = wm8994_gpio_direction_in,
257 .get = wm8994_gpio_get,
258 .direction_output = wm8994_gpio_direction_out,
259 .set = wm8994_gpio_set,
260 .set_config = wm8994_gpio_set_config,
261 .to_irq = wm8994_gpio_to_irq,
262 .dbg_show = wm8994_gpio_dbg_show,
263 .can_sleep = true,
264};
265
266static int wm8994_gpio_probe(struct platform_device *pdev)
267{
268 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
269 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
270 struct wm8994_gpio *wm8994_gpio;
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 return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
287}
288
289static struct platform_driver wm8994_gpio_driver = {
290 .driver.name = "wm8994-gpio",
291 .probe = wm8994_gpio_probe,
292};
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");