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1/*
2 * gpiolib support for Wolfson WM831x PMICs
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/wm831x/core.h>
24#include <linux/mfd/wm831x/pdata.h>
25#include <linux/mfd/wm831x/gpio.h>
26#include <linux/mfd/wm831x/irq.h>
27
28struct wm831x_gpio {
29 struct wm831x *wm831x;
30 struct gpio_chip gpio_chip;
31};
32
33static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
34{
35 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
36 struct wm831x *wm831x = wm831x_gpio->wm831x;
37 int val = WM831X_GPN_DIR;
38
39 if (wm831x->has_gpio_ena)
40 val |= WM831X_GPN_TRI;
41
42 return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
43 WM831X_GPN_DIR | WM831X_GPN_TRI |
44 WM831X_GPN_FN_MASK, val);
45}
46
47static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
48{
49 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
50 struct wm831x *wm831x = wm831x_gpio->wm831x;
51 int ret;
52
53 ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
54 if (ret < 0)
55 return ret;
56
57 if (ret & 1 << offset)
58 return 1;
59 else
60 return 0;
61}
62
63static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
64{
65 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
66 struct wm831x *wm831x = wm831x_gpio->wm831x;
67
68 wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
69 value << offset);
70}
71
72static int wm831x_gpio_direction_out(struct gpio_chip *chip,
73 unsigned offset, int value)
74{
75 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
76 struct wm831x *wm831x = wm831x_gpio->wm831x;
77 int val = 0;
78 int ret;
79
80 if (wm831x->has_gpio_ena)
81 val |= WM831X_GPN_TRI;
82
83 ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
84 WM831X_GPN_DIR | WM831X_GPN_TRI |
85 WM831X_GPN_FN_MASK, val);
86 if (ret < 0)
87 return ret;
88
89 /* Can only set GPIO state once it's in output mode */
90 wm831x_gpio_set(chip, offset, value);
91
92 return 0;
93}
94
95static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
96{
97 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
98 struct wm831x *wm831x = wm831x_gpio->wm831x;
99
100 return irq_create_mapping(wm831x->irq_domain,
101 WM831X_IRQ_GPIO_1 + offset);
102}
103
104static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
105 unsigned debounce)
106{
107 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
108 struct wm831x *wm831x = wm831x_gpio->wm831x;
109 int reg = WM831X_GPIO1_CONTROL + offset;
110 int ret, fn;
111
112 ret = wm831x_reg_read(wm831x, reg);
113 if (ret < 0)
114 return ret;
115
116 switch (ret & WM831X_GPN_FN_MASK) {
117 case 0:
118 case 1:
119 break;
120 default:
121 /* Not in GPIO mode */
122 return -EBUSY;
123 }
124
125 if (debounce >= 32 && debounce <= 64)
126 fn = 0;
127 else if (debounce >= 4000 && debounce <= 8000)
128 fn = 1;
129 else
130 return -EINVAL;
131
132 return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
133}
134
135#ifdef CONFIG_DEBUG_FS
136static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
137{
138 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
139 struct wm831x *wm831x = wm831x_gpio->wm831x;
140 int i, tristated;
141
142 for (i = 0; i < chip->ngpio; i++) {
143 int gpio = i + chip->base;
144 int reg;
145 const char *label, *pull, *powerdomain;
146
147 /* We report the GPIO even if it's not requested since
148 * we're also reporting things like alternate
149 * functions which apply even when the GPIO is not in
150 * use as a GPIO.
151 */
152 label = gpiochip_is_requested(chip, i);
153 if (!label)
154 label = "Unrequested";
155
156 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
157
158 reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
159 if (reg < 0) {
160 dev_err(wm831x->dev,
161 "GPIO control %d read failed: %d\n",
162 gpio, reg);
163 seq_printf(s, "\n");
164 continue;
165 }
166
167 switch (reg & WM831X_GPN_PULL_MASK) {
168 case WM831X_GPIO_PULL_NONE:
169 pull = "nopull";
170 break;
171 case WM831X_GPIO_PULL_DOWN:
172 pull = "pulldown";
173 break;
174 case WM831X_GPIO_PULL_UP:
175 pull = "pullup";
176 break;
177 default:
178 pull = "INVALID PULL";
179 break;
180 }
181
182 switch (i + 1) {
183 case 1 ... 3:
184 case 7 ... 9:
185 if (reg & WM831X_GPN_PWR_DOM)
186 powerdomain = "VPMIC";
187 else
188 powerdomain = "DBVDD";
189 break;
190
191 case 4 ... 6:
192 case 10 ... 12:
193 if (reg & WM831X_GPN_PWR_DOM)
194 powerdomain = "SYSVDD";
195 else
196 powerdomain = "DBVDD";
197 break;
198
199 case 13 ... 16:
200 powerdomain = "TPVDD";
201 break;
202
203 default:
204 BUG();
205 break;
206 }
207
208 tristated = reg & WM831X_GPN_TRI;
209 if (wm831x->has_gpio_ena)
210 tristated = !tristated;
211
212 seq_printf(s, " %s %s %s %s%s\n"
213 " %s%s (0x%4x)\n",
214 reg & WM831X_GPN_DIR ? "in" : "out",
215 wm831x_gpio_get(chip, i) ? "high" : "low",
216 pull,
217 powerdomain,
218 reg & WM831X_GPN_POL ? "" : " inverted",
219 reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
220 tristated ? " tristated" : "",
221 reg);
222 }
223}
224#else
225#define wm831x_gpio_dbg_show NULL
226#endif
227
228static struct gpio_chip template_chip = {
229 .label = "wm831x",
230 .owner = THIS_MODULE,
231 .direction_input = wm831x_gpio_direction_in,
232 .get = wm831x_gpio_get,
233 .direction_output = wm831x_gpio_direction_out,
234 .set = wm831x_gpio_set,
235 .to_irq = wm831x_gpio_to_irq,
236 .set_debounce = wm831x_gpio_set_debounce,
237 .dbg_show = wm831x_gpio_dbg_show,
238 .can_sleep = true,
239};
240
241static int wm831x_gpio_probe(struct platform_device *pdev)
242{
243 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
244 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
245 struct wm831x_gpio *wm831x_gpio;
246 int ret;
247
248 wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio),
249 GFP_KERNEL);
250 if (wm831x_gpio == NULL)
251 return -ENOMEM;
252
253 wm831x_gpio->wm831x = wm831x;
254 wm831x_gpio->gpio_chip = template_chip;
255 wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
256 wm831x_gpio->gpio_chip.parent = &pdev->dev;
257 if (pdata && pdata->gpio_base)
258 wm831x_gpio->gpio_chip.base = pdata->gpio_base;
259 else
260 wm831x_gpio->gpio_chip.base = -1;
261
262 ret = devm_gpiochip_add_data(&pdev->dev, &wm831x_gpio->gpio_chip,
263 wm831x_gpio);
264 if (ret < 0) {
265 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
266 return ret;
267 }
268
269 platform_set_drvdata(pdev, wm831x_gpio);
270
271 return ret;
272}
273
274static struct platform_driver wm831x_gpio_driver = {
275 .driver.name = "wm831x-gpio",
276 .driver.owner = THIS_MODULE,
277 .probe = wm831x_gpio_probe,
278};
279
280static int __init wm831x_gpio_init(void)
281{
282 return platform_driver_register(&wm831x_gpio_driver);
283}
284subsys_initcall(wm831x_gpio_init);
285
286static void __exit wm831x_gpio_exit(void)
287{
288 platform_driver_unregister(&wm831x_gpio_driver);
289}
290module_exit(wm831x_gpio_exit);
291
292MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
293MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
294MODULE_LICENSE("GPL");
295MODULE_ALIAS("platform:wm831x-gpio");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * gpiolib support for Wolfson WM831x PMICs
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
20#include <linux/mfd/wm831x/core.h>
21#include <linux/mfd/wm831x/pdata.h>
22#include <linux/mfd/wm831x/gpio.h>
23#include <linux/mfd/wm831x/irq.h>
24
25struct wm831x_gpio {
26 struct wm831x *wm831x;
27 struct gpio_chip gpio_chip;
28};
29
30static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
31{
32 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
33 struct wm831x *wm831x = wm831x_gpio->wm831x;
34 int val = WM831X_GPN_DIR;
35
36 if (wm831x->has_gpio_ena)
37 val |= WM831X_GPN_TRI;
38
39 return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
40 WM831X_GPN_DIR | WM831X_GPN_TRI |
41 WM831X_GPN_FN_MASK, val);
42}
43
44static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
45{
46 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
47 struct wm831x *wm831x = wm831x_gpio->wm831x;
48 int ret;
49
50 ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
51 if (ret < 0)
52 return ret;
53
54 if (ret & 1 << offset)
55 return 1;
56 else
57 return 0;
58}
59
60static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
61{
62 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
63 struct wm831x *wm831x = wm831x_gpio->wm831x;
64
65 wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
66 value << offset);
67}
68
69static int wm831x_gpio_direction_out(struct gpio_chip *chip,
70 unsigned offset, int value)
71{
72 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
73 struct wm831x *wm831x = wm831x_gpio->wm831x;
74 int val = 0;
75 int ret;
76
77 if (wm831x->has_gpio_ena)
78 val |= WM831X_GPN_TRI;
79
80 ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
81 WM831X_GPN_DIR | WM831X_GPN_TRI |
82 WM831X_GPN_FN_MASK, val);
83 if (ret < 0)
84 return ret;
85
86 /* Can only set GPIO state once it's in output mode */
87 wm831x_gpio_set(chip, offset, value);
88
89 return 0;
90}
91
92static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
93{
94 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
95 struct wm831x *wm831x = wm831x_gpio->wm831x;
96
97 return irq_create_mapping(wm831x->irq_domain,
98 WM831X_IRQ_GPIO_1 + offset);
99}
100
101static int wm831x_gpio_set_debounce(struct wm831x *wm831x, unsigned offset,
102 unsigned debounce)
103{
104 int reg = WM831X_GPIO1_CONTROL + offset;
105 int ret, fn;
106
107 ret = wm831x_reg_read(wm831x, reg);
108 if (ret < 0)
109 return ret;
110
111 switch (ret & WM831X_GPN_FN_MASK) {
112 case 0:
113 case 1:
114 break;
115 default:
116 /* Not in GPIO mode */
117 return -EBUSY;
118 }
119
120 if (debounce >= 32 && debounce <= 64)
121 fn = 0;
122 else if (debounce >= 4000 && debounce <= 8000)
123 fn = 1;
124 else
125 return -EINVAL;
126
127 return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
128}
129
130static int wm831x_set_config(struct gpio_chip *chip, unsigned int offset,
131 unsigned long config)
132{
133 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
134 struct wm831x *wm831x = wm831x_gpio->wm831x;
135 int reg = WM831X_GPIO1_CONTROL + offset;
136
137 switch (pinconf_to_config_param(config)) {
138 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
139 return wm831x_set_bits(wm831x, reg,
140 WM831X_GPN_OD_MASK, WM831X_GPN_OD);
141 case PIN_CONFIG_DRIVE_PUSH_PULL:
142 return wm831x_set_bits(wm831x, reg,
143 WM831X_GPN_OD_MASK, 0);
144 case PIN_CONFIG_INPUT_DEBOUNCE:
145 return wm831x_gpio_set_debounce(wm831x, offset,
146 pinconf_to_config_argument(config));
147 default:
148 break;
149 }
150
151 return -ENOTSUPP;
152}
153
154#ifdef CONFIG_DEBUG_FS
155static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
156{
157 struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
158 struct wm831x *wm831x = wm831x_gpio->wm831x;
159 int i, tristated;
160
161 for (i = 0; i < chip->ngpio; i++) {
162 int gpio = i + chip->base;
163 int reg;
164 const char *pull, *powerdomain;
165
166 /* We report the GPIO even if it's not requested since
167 * we're also reporting things like alternate
168 * functions which apply even when the GPIO is not in
169 * use as a GPIO.
170 */
171 char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
172 if (IS_ERR(label)) {
173 dev_err(wm831x->dev, "Failed to duplicate label\n");
174 continue;
175 }
176
177 seq_printf(s, " gpio-%-3d (%-20.20s) ",
178 gpio, label ?: "Unrequested");
179
180 reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
181 if (reg < 0) {
182 dev_err(wm831x->dev,
183 "GPIO control %d read failed: %d\n",
184 gpio, reg);
185 seq_putc(s, '\n');
186 continue;
187 }
188
189 switch (reg & WM831X_GPN_PULL_MASK) {
190 case WM831X_GPIO_PULL_NONE:
191 pull = "nopull";
192 break;
193 case WM831X_GPIO_PULL_DOWN:
194 pull = "pulldown";
195 break;
196 case WM831X_GPIO_PULL_UP:
197 pull = "pullup";
198 break;
199 default:
200 pull = "INVALID PULL";
201 break;
202 }
203
204 switch (i + 1) {
205 case 1 ... 3:
206 case 7 ... 9:
207 if (reg & WM831X_GPN_PWR_DOM)
208 powerdomain = "VPMIC";
209 else
210 powerdomain = "DBVDD";
211 break;
212
213 case 4 ... 6:
214 case 10 ... 12:
215 if (reg & WM831X_GPN_PWR_DOM)
216 powerdomain = "SYSVDD";
217 else
218 powerdomain = "DBVDD";
219 break;
220
221 case 13 ... 16:
222 powerdomain = "TPVDD";
223 break;
224
225 default:
226 BUG();
227 break;
228 }
229
230 tristated = reg & WM831X_GPN_TRI;
231 if (wm831x->has_gpio_ena)
232 tristated = !tristated;
233
234 seq_printf(s, " %s %s %s %s%s\n"
235 " %s%s (0x%4x)\n",
236 reg & WM831X_GPN_DIR ? "in" : "out",
237 wm831x_gpio_get(chip, i) ? "high" : "low",
238 pull,
239 powerdomain,
240 reg & WM831X_GPN_POL ? "" : " inverted",
241 reg & WM831X_GPN_OD ? "open-drain" : "push-pull",
242 tristated ? " tristated" : "",
243 reg);
244 }
245}
246#else
247#define wm831x_gpio_dbg_show NULL
248#endif
249
250static const struct gpio_chip template_chip = {
251 .label = "wm831x",
252 .owner = THIS_MODULE,
253 .direction_input = wm831x_gpio_direction_in,
254 .get = wm831x_gpio_get,
255 .direction_output = wm831x_gpio_direction_out,
256 .set = wm831x_gpio_set,
257 .to_irq = wm831x_gpio_to_irq,
258 .set_config = wm831x_set_config,
259 .dbg_show = wm831x_gpio_dbg_show,
260 .can_sleep = true,
261};
262
263static int wm831x_gpio_probe(struct platform_device *pdev)
264{
265 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
266 struct wm831x_pdata *pdata = &wm831x->pdata;
267 struct wm831x_gpio *wm831x_gpio;
268
269 device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
270
271 wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio),
272 GFP_KERNEL);
273 if (wm831x_gpio == NULL)
274 return -ENOMEM;
275
276 wm831x_gpio->wm831x = wm831x;
277 wm831x_gpio->gpio_chip = template_chip;
278 wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
279 wm831x_gpio->gpio_chip.parent = &pdev->dev;
280 if (pdata && pdata->gpio_base)
281 wm831x_gpio->gpio_chip.base = pdata->gpio_base;
282 else
283 wm831x_gpio->gpio_chip.base = -1;
284
285 return devm_gpiochip_add_data(&pdev->dev, &wm831x_gpio->gpio_chip, wm831x_gpio);
286}
287
288static struct platform_driver wm831x_gpio_driver = {
289 .driver.name = "wm831x-gpio",
290 .probe = wm831x_gpio_probe,
291};
292
293static int __init wm831x_gpio_init(void)
294{
295 return platform_driver_register(&wm831x_gpio_driver);
296}
297subsys_initcall(wm831x_gpio_init);
298
299static void __exit wm831x_gpio_exit(void)
300{
301 platform_driver_unregister(&wm831x_gpio_driver);
302}
303module_exit(wm831x_gpio_exit);
304
305MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
306MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
307MODULE_LICENSE("GPL");
308MODULE_ALIAS("platform:wm831x-gpio");