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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 void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
93{
94 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
95 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
96
97 if (value)
98 value = WM8994_GPN_LVL;
99
100 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
101}
102
103static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
104 unsigned long config)
105{
106 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
107 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
108
109 switch (pinconf_to_config_param(config)) {
110 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
111 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
112 WM8994_GPN_OP_CFG_MASK,
113 WM8994_GPN_OP_CFG);
114 case PIN_CONFIG_DRIVE_PUSH_PULL:
115 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
116 WM8994_GPN_OP_CFG_MASK, 0);
117 default:
118 break;
119 }
120
121 return -ENOTSUPP;
122}
123
124static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
125{
126 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
127 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
128
129 return regmap_irq_get_virq(wm8994->irq_data, offset);
130}
131
132
133#ifdef CONFIG_DEBUG_FS
134static const char *wm8994_gpio_fn(u16 fn)
135{
136 switch (fn) {
137 case WM8994_GP_FN_PIN_SPECIFIC:
138 return "pin-specific";
139 case WM8994_GP_FN_GPIO:
140 return "GPIO";
141 case WM8994_GP_FN_SDOUT:
142 return "SDOUT";
143 case WM8994_GP_FN_IRQ:
144 return "IRQ";
145 case WM8994_GP_FN_TEMPERATURE:
146 return "Temperature";
147 case WM8994_GP_FN_MICBIAS1_DET:
148 return "MICBIAS1 detect";
149 case WM8994_GP_FN_MICBIAS1_SHORT:
150 return "MICBIAS1 short";
151 case WM8994_GP_FN_MICBIAS2_DET:
152 return "MICBIAS2 detect";
153 case WM8994_GP_FN_MICBIAS2_SHORT:
154 return "MICBIAS2 short";
155 case WM8994_GP_FN_FLL1_LOCK:
156 return "FLL1 lock";
157 case WM8994_GP_FN_FLL2_LOCK:
158 return "FLL2 lock";
159 case WM8994_GP_FN_SRC1_LOCK:
160 return "SRC1 lock";
161 case WM8994_GP_FN_SRC2_LOCK:
162 return "SRC2 lock";
163 case WM8994_GP_FN_DRC1_ACT:
164 return "DRC1 activity";
165 case WM8994_GP_FN_DRC2_ACT:
166 return "DRC2 activity";
167 case WM8994_GP_FN_DRC3_ACT:
168 return "DRC3 activity";
169 case WM8994_GP_FN_WSEQ_STATUS:
170 return "Write sequencer";
171 case WM8994_GP_FN_FIFO_ERROR:
172 return "FIFO error";
173 case WM8994_GP_FN_OPCLK:
174 return "OPCLK";
175 case WM8994_GP_FN_THW:
176 return "Thermal warning";
177 case WM8994_GP_FN_DCS_DONE:
178 return "DC servo";
179 case WM8994_GP_FN_FLL1_OUT:
180 return "FLL1 output";
181 case WM8994_GP_FN_FLL2_OUT:
182 return "FLL1 output";
183 default:
184 return "Unknown";
185 }
186}
187
188static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
189{
190 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
191 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
192 int i;
193
194 for (i = 0; i < chip->ngpio; i++) {
195 int gpio = i + chip->base;
196 int reg;
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 char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
204 if (IS_ERR(label)) {
205 dev_err(wm8994->dev, "Failed to duplicate label\n");
206 continue;
207 }
208
209 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio,
210 label ?: "Unrequested");
211
212 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
213 if (reg < 0) {
214 dev_err(wm8994->dev,
215 "GPIO control %d read failed: %d\n",
216 gpio, reg);
217 seq_printf(s, "\n");
218 continue;
219 }
220
221 if (reg & WM8994_GPN_DIR)
222 seq_printf(s, "in ");
223 else
224 seq_printf(s, "out ");
225
226 if (reg & WM8994_GPN_PU)
227 seq_printf(s, "pull up ");
228
229 if (reg & WM8994_GPN_PD)
230 seq_printf(s, "pull down ");
231
232 if (reg & WM8994_GPN_POL)
233 seq_printf(s, "inverted ");
234 else
235 seq_printf(s, "noninverted ");
236
237 if (reg & WM8994_GPN_OP_CFG)
238 seq_printf(s, "open drain ");
239 else
240 seq_printf(s, "push-pull ");
241
242 seq_printf(s, "%s (%x)\n",
243 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
244 }
245}
246#else
247#define wm8994_gpio_dbg_show NULL
248#endif
249
250static const struct gpio_chip template_chip = {
251 .label = "wm8994",
252 .owner = THIS_MODULE,
253 .request = wm8994_gpio_request,
254 .direction_input = wm8994_gpio_direction_in,
255 .get = wm8994_gpio_get,
256 .direction_output = wm8994_gpio_direction_out,
257 .set = wm8994_gpio_set,
258 .set_config = wm8994_gpio_set_config,
259 .to_irq = wm8994_gpio_to_irq,
260 .dbg_show = wm8994_gpio_dbg_show,
261 .can_sleep = true,
262};
263
264static int wm8994_gpio_probe(struct platform_device *pdev)
265{
266 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
267 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
268 struct wm8994_gpio *wm8994_gpio;
269
270 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
271 GFP_KERNEL);
272 if (wm8994_gpio == NULL)
273 return -ENOMEM;
274
275 wm8994_gpio->wm8994 = wm8994;
276 wm8994_gpio->gpio_chip = template_chip;
277 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
278 wm8994_gpio->gpio_chip.parent = &pdev->dev;
279 if (pdata && pdata->gpio_base)
280 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
281 else
282 wm8994_gpio->gpio_chip.base = -1;
283
284 return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio);
285}
286
287static struct platform_driver wm8994_gpio_driver = {
288 .driver.name = "wm8994-gpio",
289 .probe = wm8994_gpio_probe,
290};
291
292static int __init wm8994_gpio_init(void)
293{
294 return platform_driver_register(&wm8994_gpio_driver);
295}
296subsys_initcall(wm8994_gpio_init);
297
298static void __exit wm8994_gpio_exit(void)
299{
300 platform_driver_unregister(&wm8994_gpio_driver);
301}
302module_exit(wm8994_gpio_exit);
303
304MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
305MODULE_DESCRIPTION("GPIO interface for WM8994");
306MODULE_LICENSE("GPL");
307MODULE_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
23#include <linux/mfd/wm8994/core.h>
24#include <linux/mfd/wm8994/pdata.h>
25#include <linux/mfd/wm8994/gpio.h>
26#include <linux/mfd/wm8994/registers.h>
27
28struct wm8994_gpio {
29 struct wm8994 *wm8994;
30 struct gpio_chip gpio_chip;
31};
32
33static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip)
34{
35 return container_of(chip, struct wm8994_gpio, gpio_chip);
36}
37
38static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
39{
40 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
41 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
42
43 switch (wm8994->type) {
44 case WM8958:
45 switch (offset) {
46 case 1:
47 case 2:
48 case 3:
49 case 4:
50 case 6:
51 return -EINVAL;
52 }
53 break;
54 default:
55 break;
56 }
57
58 return 0;
59}
60
61static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
62{
63 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
64 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
65
66 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
67 WM8994_GPN_DIR, WM8994_GPN_DIR);
68}
69
70static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
71{
72 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
73 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
74 int ret;
75
76 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
77 if (ret < 0)
78 return ret;
79
80 if (ret & WM8994_GPN_LVL)
81 return 1;
82 else
83 return 0;
84}
85
86static int wm8994_gpio_direction_out(struct gpio_chip *chip,
87 unsigned offset, int value)
88{
89 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
90 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
91
92 if (value)
93 value = WM8994_GPN_LVL;
94
95 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
96 WM8994_GPN_DIR | WM8994_GPN_LVL, value);
97}
98
99static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
100{
101 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
102 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
103
104 if (value)
105 value = WM8994_GPN_LVL;
106
107 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
108}
109
110static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
111{
112 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
113 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
114
115 if (!wm8994->irq_base)
116 return -EINVAL;
117
118 return wm8994->irq_base + offset;
119}
120
121
122#ifdef CONFIG_DEBUG_FS
123static const char *wm8994_gpio_fn(u16 fn)
124{
125 switch (fn) {
126 case WM8994_GP_FN_PIN_SPECIFIC:
127 return "pin-specific";
128 case WM8994_GP_FN_GPIO:
129 return "GPIO";
130 case WM8994_GP_FN_SDOUT:
131 return "SDOUT";
132 case WM8994_GP_FN_IRQ:
133 return "IRQ";
134 case WM8994_GP_FN_TEMPERATURE:
135 return "Temperature";
136 case WM8994_GP_FN_MICBIAS1_DET:
137 return "MICBIAS1 detect";
138 case WM8994_GP_FN_MICBIAS1_SHORT:
139 return "MICBIAS1 short";
140 case WM8994_GP_FN_MICBIAS2_DET:
141 return "MICBIAS2 detect";
142 case WM8994_GP_FN_MICBIAS2_SHORT:
143 return "MICBIAS2 short";
144 case WM8994_GP_FN_FLL1_LOCK:
145 return "FLL1 lock";
146 case WM8994_GP_FN_FLL2_LOCK:
147 return "FLL2 lock";
148 case WM8994_GP_FN_SRC1_LOCK:
149 return "SRC1 lock";
150 case WM8994_GP_FN_SRC2_LOCK:
151 return "SRC2 lock";
152 case WM8994_GP_FN_DRC1_ACT:
153 return "DRC1 activity";
154 case WM8994_GP_FN_DRC2_ACT:
155 return "DRC2 activity";
156 case WM8994_GP_FN_DRC3_ACT:
157 return "DRC3 activity";
158 case WM8994_GP_FN_WSEQ_STATUS:
159 return "Write sequencer";
160 case WM8994_GP_FN_FIFO_ERROR:
161 return "FIFO error";
162 case WM8994_GP_FN_OPCLK:
163 return "OPCLK";
164 case WM8994_GP_FN_THW:
165 return "Thermal warning";
166 case WM8994_GP_FN_DCS_DONE:
167 return "DC servo";
168 case WM8994_GP_FN_FLL1_OUT:
169 return "FLL1 output";
170 case WM8994_GP_FN_FLL2_OUT:
171 return "FLL1 output";
172 default:
173 return "Unknown";
174 }
175}
176
177static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
178{
179 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
180 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
181 int i;
182
183 for (i = 0; i < chip->ngpio; i++) {
184 int gpio = i + chip->base;
185 int reg;
186 const char *label;
187
188 /* We report the GPIO even if it's not requested since
189 * we're also reporting things like alternate
190 * functions which apply even when the GPIO is not in
191 * use as a GPIO.
192 */
193 label = gpiochip_is_requested(chip, i);
194 if (!label)
195 label = "Unrequested";
196
197 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
198
199 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
200 if (reg < 0) {
201 dev_err(wm8994->dev,
202 "GPIO control %d read failed: %d\n",
203 gpio, reg);
204 seq_printf(s, "\n");
205 continue;
206 }
207
208 if (reg & WM8994_GPN_DIR)
209 seq_printf(s, "in ");
210 else
211 seq_printf(s, "out ");
212
213 if (reg & WM8994_GPN_PU)
214 seq_printf(s, "pull up ");
215
216 if (reg & WM8994_GPN_PD)
217 seq_printf(s, "pull down ");
218
219 if (reg & WM8994_GPN_POL)
220 seq_printf(s, "inverted ");
221 else
222 seq_printf(s, "noninverted ");
223
224 if (reg & WM8994_GPN_OP_CFG)
225 seq_printf(s, "open drain ");
226 else
227 seq_printf(s, "CMOS ");
228
229 seq_printf(s, "%s (%x)\n",
230 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
231 }
232}
233#else
234#define wm8994_gpio_dbg_show NULL
235#endif
236
237static struct gpio_chip template_chip = {
238 .label = "wm8994",
239 .owner = THIS_MODULE,
240 .request = wm8994_gpio_request,
241 .direction_input = wm8994_gpio_direction_in,
242 .get = wm8994_gpio_get,
243 .direction_output = wm8994_gpio_direction_out,
244 .set = wm8994_gpio_set,
245 .to_irq = wm8994_gpio_to_irq,
246 .dbg_show = wm8994_gpio_dbg_show,
247 .can_sleep = 1,
248};
249
250static int __devinit wm8994_gpio_probe(struct platform_device *pdev)
251{
252 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
253 struct wm8994_pdata *pdata = wm8994->dev->platform_data;
254 struct wm8994_gpio *wm8994_gpio;
255 int ret;
256
257 wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL);
258 if (wm8994_gpio == NULL)
259 return -ENOMEM;
260
261 wm8994_gpio->wm8994 = wm8994;
262 wm8994_gpio->gpio_chip = template_chip;
263 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
264 wm8994_gpio->gpio_chip.dev = &pdev->dev;
265 if (pdata && pdata->gpio_base)
266 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
267 else
268 wm8994_gpio->gpio_chip.base = -1;
269
270 ret = gpiochip_add(&wm8994_gpio->gpio_chip);
271 if (ret < 0) {
272 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
273 ret);
274 goto err;
275 }
276
277 platform_set_drvdata(pdev, wm8994_gpio);
278
279 return ret;
280
281err:
282 kfree(wm8994_gpio);
283 return ret;
284}
285
286static int __devexit wm8994_gpio_remove(struct platform_device *pdev)
287{
288 struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
289 int ret;
290
291 ret = gpiochip_remove(&wm8994_gpio->gpio_chip);
292 if (ret == 0)
293 kfree(wm8994_gpio);
294
295 return ret;
296}
297
298static struct platform_driver wm8994_gpio_driver = {
299 .driver.name = "wm8994-gpio",
300 .driver.owner = THIS_MODULE,
301 .probe = wm8994_gpio_probe,
302 .remove = __devexit_p(wm8994_gpio_remove),
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");