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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#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 inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip)
35{
36 return container_of(chip, struct wm8994_gpio, gpio_chip);
37}
38
39static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
40{
41 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
42 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
43
44 switch (wm8994->type) {
45 case WM8958:
46 switch (offset) {
47 case 1:
48 case 2:
49 case 3:
50 case 4:
51 case 6:
52 return -EINVAL;
53 }
54 break;
55 default:
56 break;
57 }
58
59 return 0;
60}
61
62static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
63{
64 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
65 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
66
67 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
68 WM8994_GPN_DIR, WM8994_GPN_DIR);
69}
70
71static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
72{
73 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
74 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
75 int ret;
76
77 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
78 if (ret < 0)
79 return ret;
80
81 if (ret & WM8994_GPN_LVL)
82 return 1;
83 else
84 return 0;
85}
86
87static int wm8994_gpio_direction_out(struct gpio_chip *chip,
88 unsigned offset, int value)
89{
90 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
91 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
92
93 if (value)
94 value = WM8994_GPN_LVL;
95
96 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
97 WM8994_GPN_DIR | WM8994_GPN_LVL, value);
98}
99
100static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
101{
102 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
103 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
104
105 if (value)
106 value = WM8994_GPN_LVL;
107
108 wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
109}
110
111static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
112{
113 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
114 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
115
116 return regmap_irq_get_virq(wm8994->irq_data, offset);
117}
118
119
120#ifdef CONFIG_DEBUG_FS
121static const char *wm8994_gpio_fn(u16 fn)
122{
123 switch (fn) {
124 case WM8994_GP_FN_PIN_SPECIFIC:
125 return "pin-specific";
126 case WM8994_GP_FN_GPIO:
127 return "GPIO";
128 case WM8994_GP_FN_SDOUT:
129 return "SDOUT";
130 case WM8994_GP_FN_IRQ:
131 return "IRQ";
132 case WM8994_GP_FN_TEMPERATURE:
133 return "Temperature";
134 case WM8994_GP_FN_MICBIAS1_DET:
135 return "MICBIAS1 detect";
136 case WM8994_GP_FN_MICBIAS1_SHORT:
137 return "MICBIAS1 short";
138 case WM8994_GP_FN_MICBIAS2_DET:
139 return "MICBIAS2 detect";
140 case WM8994_GP_FN_MICBIAS2_SHORT:
141 return "MICBIAS2 short";
142 case WM8994_GP_FN_FLL1_LOCK:
143 return "FLL1 lock";
144 case WM8994_GP_FN_FLL2_LOCK:
145 return "FLL2 lock";
146 case WM8994_GP_FN_SRC1_LOCK:
147 return "SRC1 lock";
148 case WM8994_GP_FN_SRC2_LOCK:
149 return "SRC2 lock";
150 case WM8994_GP_FN_DRC1_ACT:
151 return "DRC1 activity";
152 case WM8994_GP_FN_DRC2_ACT:
153 return "DRC2 activity";
154 case WM8994_GP_FN_DRC3_ACT:
155 return "DRC3 activity";
156 case WM8994_GP_FN_WSEQ_STATUS:
157 return "Write sequencer";
158 case WM8994_GP_FN_FIFO_ERROR:
159 return "FIFO error";
160 case WM8994_GP_FN_OPCLK:
161 return "OPCLK";
162 case WM8994_GP_FN_THW:
163 return "Thermal warning";
164 case WM8994_GP_FN_DCS_DONE:
165 return "DC servo";
166 case WM8994_GP_FN_FLL1_OUT:
167 return "FLL1 output";
168 case WM8994_GP_FN_FLL2_OUT:
169 return "FLL1 output";
170 default:
171 return "Unknown";
172 }
173}
174
175static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
176{
177 struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
178 struct wm8994 *wm8994 = wm8994_gpio->wm8994;
179 int i;
180
181 for (i = 0; i < chip->ngpio; i++) {
182 int gpio = i + chip->base;
183 int reg;
184 const char *label;
185
186
187
188
189
190
191 label = gpiochip_is_requested(chip, i);
192 if (!label)
193 label = "Unrequested";
194
195 seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
196
197 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
198 if (reg < 0) {
199 dev_err(wm8994->dev,
200 "GPIO control %d read failed: %d\n",
201 gpio, reg);
202 seq_printf(s, "\n");
203 continue;
204 }
205
206 if (reg & WM8994_GPN_DIR)
207 seq_printf(s, "in ");
208 else
209 seq_printf(s, "out ");
210
211 if (reg & WM8994_GPN_PU)
212 seq_printf(s, "pull up ");
213
214 if (reg & WM8994_GPN_PD)
215 seq_printf(s, "pull down ");
216
217 if (reg & WM8994_GPN_POL)
218 seq_printf(s, "inverted ");
219 else
220 seq_printf(s, "noninverted ");
221
222 if (reg & WM8994_GPN_OP_CFG)
223 seq_printf(s, "open drain ");
224 else
225 seq_printf(s, "CMOS ");
226
227 seq_printf(s, "%s (%x)\n",
228 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
229 }
230}
231#else
232#define wm8994_gpio_dbg_show NULL
233#endif
234
235static struct gpio_chip template_chip = {
236 .label = "wm8994",
237 .owner = THIS_MODULE,
238 .request = wm8994_gpio_request,
239 .direction_input = wm8994_gpio_direction_in,
240 .get = wm8994_gpio_get,
241 .direction_output = wm8994_gpio_direction_out,
242 .set = wm8994_gpio_set,
243 .to_irq = wm8994_gpio_to_irq,
244 .dbg_show = wm8994_gpio_dbg_show,
245 .can_sleep = 1,
246};
247
248static int wm8994_gpio_probe(struct platform_device *pdev)
249{
250 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
251 struct wm8994_pdata *pdata = wm8994->dev->platform_data;
252 struct wm8994_gpio *wm8994_gpio;
253 int ret;
254
255 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
256 GFP_KERNEL);
257 if (wm8994_gpio == NULL)
258 return -ENOMEM;
259
260 wm8994_gpio->wm8994 = wm8994;
261 wm8994_gpio->gpio_chip = template_chip;
262 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
263 wm8994_gpio->gpio_chip.dev = &pdev->dev;
264 if (pdata && pdata->gpio_base)
265 wm8994_gpio->gpio_chip.base = pdata->gpio_base;
266 else
267 wm8994_gpio->gpio_chip.base = -1;
268
269 ret = gpiochip_add(&wm8994_gpio->gpio_chip);
270 if (ret < 0) {
271 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
272 ret);
273 goto err;
274 }
275
276 platform_set_drvdata(pdev, wm8994_gpio);
277
278 return ret;
279
280err:
281 return ret;
282}
283
284static int wm8994_gpio_remove(struct platform_device *pdev)
285{
286 struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
287
288 return gpiochip_remove(&wm8994_gpio->gpio_chip);
289}
290
291static struct platform_driver wm8994_gpio_driver = {
292 .driver.name = "wm8994-gpio",
293 .driver.owner = THIS_MODULE,
294 .probe = wm8994_gpio_probe,
295 .remove = wm8994_gpio_remove,
296};
297
298static int __init wm8994_gpio_init(void)
299{
300 return platform_driver_register(&wm8994_gpio_driver);
301}
302subsys_initcall(wm8994_gpio_init);
303
304static void __exit wm8994_gpio_exit(void)
305{
306 platform_driver_unregister(&wm8994_gpio_driver);
307}
308module_exit(wm8994_gpio_exit);
309
310MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
311MODULE_DESCRIPTION("GPIO interface for WM8994");
312MODULE_LICENSE("GPL");
313MODULE_ALIAS("platform:wm8994-gpio");
314
