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