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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 inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
34{
35 return container_of(chip, struct wm831x_gpio, gpio_chip);
36}
37
38static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
39{
40 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
41 struct wm831x *wm831x = wm831x_gpio->wm831x;
42 int val = WM831X_GPN_DIR;
43
44 if (wm831x->has_gpio_ena)
45 val |= WM831X_GPN_TRI;
46
47 return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
48 WM831X_GPN_DIR | WM831X_GPN_TRI |
49 WM831X_GPN_FN_MASK, val);
50}
51
52static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
53{
54 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
55 struct wm831x *wm831x = wm831x_gpio->wm831x;
56 int ret;
57
58 ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
59 if (ret < 0)
60 return ret;
61
62 if (ret & 1 << offset)
63 return 1;
64 else
65 return 0;
66}
67
68static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
69{
70 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
71 struct wm831x *wm831x = wm831x_gpio->wm831x;
72
73 wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
74 value << offset);
75}
76
77static int wm831x_gpio_direction_out(struct gpio_chip *chip,
78 unsigned offset, int value)
79{
80 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
81 struct wm831x *wm831x = wm831x_gpio->wm831x;
82 int val = 0;
83 int ret;
84
85 if (wm831x->has_gpio_ena)
86 val |= WM831X_GPN_TRI;
87
88 ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
89 WM831X_GPN_DIR | WM831X_GPN_TRI |
90 WM831X_GPN_FN_MASK, val);
91 if (ret < 0)
92 return ret;
93
94
95 wm831x_gpio_set(chip, offset, value);
96
97 return 0;
98}
99
100static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
101{
102 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
103 struct wm831x *wm831x = wm831x_gpio->wm831x;
104
105 return irq_create_mapping(wm831x->irq_domain,
106 WM831X_IRQ_GPIO_1 + offset);
107}
108
109static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
110 unsigned debounce)
111{
112 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
113 struct wm831x *wm831x = wm831x_gpio->wm831x;
114 int reg = WM831X_GPIO1_CONTROL + offset;
115 int ret, fn;
116
117 ret = wm831x_reg_read(wm831x, reg);
118 if (ret < 0)
119 return ret;
120
121 switch (ret & WM831X_GPN_FN_MASK) {
122 case 0:
123 case 1:
124 break;
125 default:
126
127 return -EBUSY;
128 }
129
130 if (debounce >= 32 && debounce <= 64)
131 fn = 0;
132 else if (debounce >= 4000 && debounce <= 8000)
133 fn = 1;
134 else
135 return -EINVAL;
136
137 return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
138}
139
140#ifdef CONFIG_DEBUG_FS
141static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
142{
143 struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
144 struct wm831x *wm831x = wm831x_gpio->wm831x;
145 int i, tristated;
146
147 for (i = 0; i < chip->ngpio; i++) {
148 int gpio = i + chip->base;
149 int reg;
150 const char *label, *pull, *powerdomain;
151
152
153
154
155
156
157 label = gpiochip_is_requested(chip, i);
158 if (!label)
159 label = "Unrequested";
160
161 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
162
163 reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
164 if (reg < 0) {
165 dev_err(wm831x->dev,
166 "GPIO control %d read failed: %d\n",
167 gpio, reg);
168 seq_printf(s, "\n");
169 continue;
170 }
171
172 switch (reg & WM831X_GPN_PULL_MASK) {
173 case WM831X_GPIO_PULL_NONE:
174 pull = "nopull";
175 break;
176 case WM831X_GPIO_PULL_DOWN:
177 pull = "pulldown";
178 break;
179 case WM831X_GPIO_PULL_UP:
180 pull = "pullup";
181 break;
182 default:
183 pull = "INVALID PULL";
184 break;
185 }
186
187 switch (i + 1) {
188 case 1 ... 3:
189 case 7 ... 9:
190 if (reg & WM831X_GPN_PWR_DOM)
191 powerdomain = "VPMIC";
192 else
193 powerdomain = "DBVDD";
194 break;
195
196 case 4 ... 6:
197 case 10 ... 12:
198 if (reg & WM831X_GPN_PWR_DOM)
199 powerdomain = "SYSVDD";
200 else
201 powerdomain = "DBVDD";
202 break;
203
204 case 13 ... 16:
205 powerdomain = "TPVDD";
206 break;
207
208 default:
209 BUG();
210 break;
211 }
212
213 tristated = reg & WM831X_GPN_TRI;
214 if (wm831x->has_gpio_ena)
215 tristated = !tristated;
216
217 seq_printf(s, " %s %s %s %s%s\n"
218 " %s%s (0x%4x)\n",
219 reg & WM831X_GPN_DIR ? "in" : "out",
220 wm831x_gpio_get(chip, i) ? "high" : "low",
221 pull,
222 powerdomain,
223 reg & WM831X_GPN_POL ? "" : " inverted",
224 reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
225 tristated ? " tristated" : "",
226 reg);
227 }
228}
229#else
230#define wm831x_gpio_dbg_show NULL
231#endif
232
233static struct gpio_chip template_chip = {
234 .label = "wm831x",
235 .owner = THIS_MODULE,
236 .direction_input = wm831x_gpio_direction_in,
237 .get = wm831x_gpio_get,
238 .direction_output = wm831x_gpio_direction_out,
239 .set = wm831x_gpio_set,
240 .to_irq = wm831x_gpio_to_irq,
241 .set_debounce = wm831x_gpio_set_debounce,
242 .dbg_show = wm831x_gpio_dbg_show,
243 .can_sleep = true,
244};
245
246static int wm831x_gpio_probe(struct platform_device *pdev)
247{
248 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
249 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
250 struct wm831x_gpio *wm831x_gpio;
251 int ret;
252
253 wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio),
254 GFP_KERNEL);
255 if (wm831x_gpio == NULL)
256 return -ENOMEM;
257
258 wm831x_gpio->wm831x = wm831x;
259 wm831x_gpio->gpio_chip = template_chip;
260 wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
261 wm831x_gpio->gpio_chip.dev = &pdev->dev;
262 if (pdata && pdata->gpio_base)
263 wm831x_gpio->gpio_chip.base = pdata->gpio_base;
264 else
265 wm831x_gpio->gpio_chip.base = -1;
266
267 ret = gpiochip_add(&wm831x_gpio->gpio_chip);
268 if (ret < 0) {
269 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
270 return ret;
271 }
272
273 platform_set_drvdata(pdev, wm831x_gpio);
274
275 return ret;
276}
277
278static int wm831x_gpio_remove(struct platform_device *pdev)
279{
280 struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
281
282 gpiochip_remove(&wm831x_gpio->gpio_chip);
283 return 0;
284}
285
286static struct platform_driver wm831x_gpio_driver = {
287 .driver.name = "wm831x-gpio",
288 .driver.owner = THIS_MODULE,
289 .probe = wm831x_gpio_probe,
290 .remove = wm831x_gpio_remove,
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");
309
