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