Loading...
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/kernel.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/gpio/driver.h>
15#include <linux/mfd/core.h>
16#include <linux/platform_device.h>
17#include <linux/seq_file.h>
18#include <linux/regmap.h>
19
20#include <linux/mfd/wm8994/core.h>
21#include <linux/mfd/wm8994/pdata.h>
22#include <linux/mfd/wm8994/gpio.h>
23#include <linux/mfd/wm8994/registers.h>
24
25struct wm8994_gpio {
26 struct wm8994 *wm8994;
27 struct gpio_chip gpio_chip;
28};
29
30static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
31{
32 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
33 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
34
35 switch (wm8994->type) {
36 case WM8958:
37 switch (offset) {
38 case 1:
39 case 2:
40 case 3:
41 case 4:
42 case 6:
43 return -EINVAL;
44 }
45 break;
46 default:
47 break;
48 }
49
50 return 0;
51}
52
53static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
54{
55 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
56 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
57
58 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
59 WM8994_GPN_DIR, WM8994_GPN_DIR);
60}
61
62static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
63{
64 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
65 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
66 int ret;
67
68 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
69 if (ret < 0)
70 return ret;
71
72 if (ret & WM8994_GPN_LVL)
73 return 1;
74 else
75 return 0;
76}
77
78static int wm8994_gpio_direction_out(struct gpio_chip *chip,
79 unsigned offset, int value)
80{
81 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
82 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
83
84 if (value)
85 value = WM8994_GPN_LVL;
86
87 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
88 WM8994_GPN_DIR | WM8994_GPN_LVL, value);
89}
90
91static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
92{
93 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
94 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
95
96 if (value)
97 value = WM8994_GPN_LVL;
98
99 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
100}
101
102static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
103 unsigned long config)
104{
105 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
106 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
107
108 switch (pinconf_to_config_param(config)) {
109 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
110 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
111 WM8994_GPN_OP_CFG_MASK,
112 WM8994_GPN_OP_CFG);
113 case PIN_CONFIG_DRIVE_PUSH_PULL:
114 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
115 WM8994_GPN_OP_CFG_MASK, 0);
116 default:
117 break;
118 }
119
120 return -ENOTSUPP;
121}
122
123static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
124{
125 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
126 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
127
128 return regmap_irq_get_virq(wm8994->irq_data, offset);
129}
130
131
132#ifdef CONFIG_DEBUG_FS
133static const char *wm8994_gpio_fn(u16 fn)
134{
135 switch (fn) {
136 case WM8994_GP_FN_PIN_SPECIFIC:
137 return "pin-specific";
138 case WM8994_GP_FN_GPIO:
139 return "GPIO";
140 case WM8994_GP_FN_SDOUT:
141 return "SDOUT";
142 case WM8994_GP_FN_IRQ:
143 return "IRQ";
144 case WM8994_GP_FN_TEMPERATURE:
145 return "Temperature";
146 case WM8994_GP_FN_MICBIAS1_DET:
147 return "MICBIAS1 detect";
148 case WM8994_GP_FN_MICBIAS1_SHORT:
149 return "MICBIAS1 short";
150 case WM8994_GP_FN_MICBIAS2_DET:
151 return "MICBIAS2 detect";
152 case WM8994_GP_FN_MICBIAS2_SHORT:
153 return "MICBIAS2 short";
154 case WM8994_GP_FN_FLL1_LOCK:
155 return "FLL1 lock";
156 case WM8994_GP_FN_FLL2_LOCK:
157 return "FLL2 lock";
158 case WM8994_GP_FN_SRC1_LOCK:
159 return "SRC1 lock";
160 case WM8994_GP_FN_SRC2_LOCK:
161 return "SRC2 lock";
162 case WM8994_GP_FN_DRC1_ACT:
163 return "DRC1 activity";
164 case WM8994_GP_FN_DRC2_ACT:
165 return "DRC2 activity";
166 case WM8994_GP_FN_DRC3_ACT:
167 return "DRC3 activity";
168 case WM8994_GP_FN_WSEQ_STATUS:
169 return "Write sequencer";
170 case WM8994_GP_FN_FIFO_ERROR:
171 return "FIFO error";
172 case WM8994_GP_FN_OPCLK:
173 return "OPCLK";
174 case WM8994_GP_FN_THW:
175 return "Thermal warning";
176 case WM8994_GP_FN_DCS_DONE:
177 return "DC servo";
178 case WM8994_GP_FN_FLL1_OUT:
179 return "FLL1 output";
180 case WM8994_GP_FN_FLL2_OUT:
181 return "FLL1 output";
182 default:
183 return "Unknown";
184 }
185}
186
187static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
188{
189 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
190 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
191 int i;
192
193 for (i = 0; i < chip->ngpio; i++) {
194 int gpio = i + chip->base;
195 int reg;
196 const char *label;
197
198 /* We report the GPIO even if it's not requested since
199 * we're also reporting things like alternate
200 * functions which apply even when the GPIO is not in
201 * use as a GPIO.
202 */
203 label = gpiochip_is_requested(chip, i);
204 if (!label)
205 label = "Unrequested";
206
207 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
208
209 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
210 if (reg < 0) {
211 dev_err(wm8994->dev,
212 "GPIO control %d read failed: %d\n",
213 gpio, reg);
214 seq_printf(s, "\n");
215 continue;
216 }
217
218 if (reg & WM8994_GPN_DIR)
219 seq_printf(s, "in ");
220 else
221 seq_printf(s, "out ");
222
223 if (reg & WM8994_GPN_PU)
224 seq_printf(s, "pull up ");
225
226 if (reg & WM8994_GPN_PD)
227 seq_printf(s, "pull down ");
228
229 if (reg & WM8994_GPN_POL)
230 seq_printf(s, "inverted ");
231 else
232 seq_printf(s, "noninverted ");
233
234 if (reg & WM8994_GPN_OP_CFG)
235 seq_printf(s, "open drain ");
236 else
237 seq_printf(s, "push-pull ");
238
239 seq_printf(s, "%s (%x)\n",
240 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
241 }
242}
243#else
244#define wm8994_gpio_dbg_show NULL
245#endif
246
247static const struct gpio_chip template_chip = {
248 .label = "wm8994",
249 .owner = THIS_MODULE,
250 .request = wm8994_gpio_request,
251 .direction_input = wm8994_gpio_direction_in,
252 .get = wm8994_gpio_get,
253 .direction_output = wm8994_gpio_direction_out,
254 .set = wm8994_gpio_set,
255 .set_config = wm8994_gpio_set_config,
256 .to_irq = wm8994_gpio_to_irq,
257 .dbg_show = wm8994_gpio_dbg_show,
258 .can_sleep = true,
259};
260
261static int wm8994_gpio_probe(struct platform_device *pdev)
262{
263 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
264 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
265 struct wm8994_gpio *wm8994_gpio;
266
267 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
268 GFP_KERNEL);
269 if (wm8994_gpio == NULL)
270 return -ENOMEM;
271
272 wm8994_gpio->wm8994 = wm8994;
273 wm8994_gpio->gpio_chip = template_chip;
274 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
275 wm8994_gpio->gpio_chip.parent = &pdev->dev;
276 if (pdata && pdata->gpio_base)
277 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
278 else
279 wm8994_gpio->gpio_chip.base = -1;
280
281 return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
282}
283
284static struct platform_driver wm8994_gpio_driver = {
285 .driver.name = "wm8994-gpio",
286 .probe = wm8994_gpio_probe,
287};
288
289static int __init wm8994_gpio_init(void)
290{
291 return platform_driver_register(&wm8994_gpio_driver);
292}
293subsys_initcall(wm8994_gpio_init);
294
295static void __exit wm8994_gpio_exit(void)
296{
297 platform_driver_unregister(&wm8994_gpio_driver);
298}
299module_exit(wm8994_gpio_exit);
300
301MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
302MODULE_DESCRIPTION("GPIO interface for WM8994");
303MODULE_LICENSE("GPL");
304MODULE_ALIAS("platform:wm8994-gpio");
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_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
128static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
129{
130 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
131 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
132
133 return regmap_irq_get_virq(wm8994->irq_data, offset);
134}
135
136
137#ifdef CONFIG_DEBUG_FS
138static 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
192static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
193{
194 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
195 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
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_single_ended = wm8994_gpio_set_single_ended,
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 int ret;
272
273 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
274 GFP_KERNEL);
275 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;
281 wm8994_gpio->gpio_chip.parent = &pdev->dev;
282 if (pdata && pdata->gpio_base)
283 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
284 else
285 wm8994_gpio->gpio_chip.base = -1;
286
287 ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip,
288 wm8994_gpio);
289 if (ret < 0) {
290 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
291 ret);
292 return ret;
293 }
294
295 platform_set_drvdata(pdev, wm8994_gpio);
296
297 return ret;
298}
299
300static struct platform_driver wm8994_gpio_driver = {
301 .driver.name = "wm8994-gpio",
302 .probe = wm8994_gpio_probe,
303};
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");