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12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/leds.h>
17#include <linux/err.h>
18#include <linux/mfd/wm831x/core.h>
19#include <linux/mfd/wm831x/pdata.h>
20#include <linux/mfd/wm831x/status.h>
21
22
23struct wm831x_status {
24 struct led_classdev cdev;
25 struct wm831x *wm831x;
26 struct work_struct work;
27 struct mutex mutex;
28
29 spinlock_t value_lock;
30 int reg;
31 int reg_val;
32
33 int blink;
34 int blink_time;
35 int blink_cyc;
36 int src;
37 enum led_brightness brightness;
38};
39
40#define to_wm831x_status(led_cdev) \
41 container_of(led_cdev, struct wm831x_status, cdev)
42
43static void wm831x_status_work(struct work_struct *work)
44{
45 struct wm831x_status *led = container_of(work, struct wm831x_status,
46 work);
47 unsigned long flags;
48
49 mutex_lock(&led->mutex);
50
51 led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK |
52 WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK);
53
54 spin_lock_irqsave(&led->value_lock, flags);
55
56 led->reg_val |= led->src << WM831X_LED_SRC_SHIFT;
57 if (led->blink) {
58 led->reg_val |= 2 << WM831X_LED_MODE_SHIFT;
59 led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT;
60 led->reg_val |= led->blink_cyc;
61 } else {
62 if (led->brightness != LED_OFF)
63 led->reg_val |= 1 << WM831X_LED_MODE_SHIFT;
64 }
65
66 spin_unlock_irqrestore(&led->value_lock, flags);
67
68 wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
69
70 mutex_unlock(&led->mutex);
71}
72
73static void wm831x_status_set(struct led_classdev *led_cdev,
74 enum led_brightness value)
75{
76 struct wm831x_status *led = to_wm831x_status(led_cdev);
77 unsigned long flags;
78
79 spin_lock_irqsave(&led->value_lock, flags);
80 led->brightness = value;
81 if (value == LED_OFF)
82 led->blink = 0;
83 schedule_work(&led->work);
84 spin_unlock_irqrestore(&led->value_lock, flags);
85}
86
87static int wm831x_status_blink_set(struct led_classdev *led_cdev,
88 unsigned long *delay_on,
89 unsigned long *delay_off)
90{
91 struct wm831x_status *led = to_wm831x_status(led_cdev);
92 unsigned long flags;
93 int ret = 0;
94
95
96 if (*delay_on == 0 && *delay_off == 0) {
97 *delay_on = 250;
98 *delay_off = 250;
99 }
100
101 spin_lock_irqsave(&led->value_lock, flags);
102
103
104
105 switch (*delay_on) {
106 case 1000:
107 led->blink_time = 0;
108 break;
109 case 250:
110 led->blink_time = 1;
111 break;
112 case 125:
113 led->blink_time = 2;
114 break;
115 case 62:
116 case 63:
117
118 led->blink_time = 3;
119 break;
120 default:
121 ret = -EINVAL;
122 break;
123 }
124
125 if (ret == 0) {
126 switch (*delay_off / *delay_on) {
127 case 1:
128 led->blink_cyc = 0;
129 break;
130 case 3:
131 led->blink_cyc = 1;
132 break;
133 case 4:
134 led->blink_cyc = 2;
135 break;
136 case 8:
137 led->blink_cyc = 3;
138 break;
139 default:
140 ret = -EINVAL;
141 break;
142 }
143 }
144
145 if (ret == 0)
146 led->blink = 1;
147 else
148 led->blink = 0;
149
150
151
152 schedule_work(&led->work);
153
154 spin_unlock_irqrestore(&led->value_lock, flags);
155
156 return ret;
157}
158
159static const char *led_src_texts[] = {
160 "otp",
161 "power",
162 "charger",
163 "soft",
164};
165
166static ssize_t wm831x_status_src_show(struct device *dev,
167 struct device_attribute *attr, char *buf)
168{
169 struct led_classdev *led_cdev = dev_get_drvdata(dev);
170 struct wm831x_status *led = to_wm831x_status(led_cdev);
171 int i;
172 ssize_t ret = 0;
173
174 mutex_lock(&led->mutex);
175
176 for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
177 if (i == led->src)
178 ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
179 else
180 ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
181
182 mutex_unlock(&led->mutex);
183
184 ret += sprintf(&buf[ret], "\n");
185
186 return ret;
187}
188
189static ssize_t wm831x_status_src_store(struct device *dev,
190 struct device_attribute *attr,
191 const char *buf, size_t size)
192{
193 struct led_classdev *led_cdev = dev_get_drvdata(dev);
194 struct wm831x_status *led = to_wm831x_status(led_cdev);
195 char name[20];
196 int i;
197 size_t len;
198
199 name[sizeof(name) - 1] = '\0';
200 strncpy(name, buf, sizeof(name) - 1);
201 len = strlen(name);
202
203 if (len && name[len - 1] == '\n')
204 name[len - 1] = '\0';
205
206 for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
207 if (!strcmp(name, led_src_texts[i])) {
208 mutex_lock(&led->mutex);
209
210 led->src = i;
211 schedule_work(&led->work);
212
213 mutex_unlock(&led->mutex);
214 }
215 }
216
217 return size;
218}
219
220static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
221
222static int wm831x_status_probe(struct platform_device *pdev)
223{
224 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
225 struct wm831x_pdata *chip_pdata;
226 struct wm831x_status_pdata pdata;
227 struct wm831x_status *drvdata;
228 struct resource *res;
229 int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
230 int ret;
231
232 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
233 if (res == NULL) {
234 dev_err(&pdev->dev, "No I/O resource\n");
235 ret = -EINVAL;
236 goto err;
237 }
238
239 drvdata = kzalloc(sizeof(struct wm831x_status), GFP_KERNEL);
240 if (!drvdata)
241 return -ENOMEM;
242 dev_set_drvdata(&pdev->dev, drvdata);
243
244 drvdata->wm831x = wm831x;
245 drvdata->reg = res->start;
246
247 if (wm831x->dev->platform_data)
248 chip_pdata = wm831x->dev->platform_data;
249 else
250 chip_pdata = NULL;
251
252 memset(&pdata, 0, sizeof(pdata));
253 if (chip_pdata && chip_pdata->status[id])
254 memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
255 else
256 pdata.name = dev_name(&pdev->dev);
257
258 mutex_init(&drvdata->mutex);
259 INIT_WORK(&drvdata->work, wm831x_status_work);
260 spin_lock_init(&drvdata->value_lock);
261
262
263
264 drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
265
266 if (drvdata->reg_val & WM831X_LED_MODE_MASK)
267 drvdata->brightness = LED_FULL;
268 else
269 drvdata->brightness = LED_OFF;
270
271
272
273
274 if (pdata.default_src == WM831X_STATUS_PRESERVE) {
275 drvdata->src = drvdata->reg_val;
276 drvdata->src &= WM831X_LED_SRC_MASK;
277 drvdata->src >>= WM831X_LED_SRC_SHIFT;
278 } else {
279 drvdata->src = pdata.default_src - 1;
280 }
281
282 drvdata->cdev.name = pdata.name;
283 drvdata->cdev.default_trigger = pdata.default_trigger;
284 drvdata->cdev.brightness_set = wm831x_status_set;
285 drvdata->cdev.blink_set = wm831x_status_blink_set;
286
287 ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
288 if (ret < 0) {
289 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
290 goto err_led;
291 }
292
293 ret = device_create_file(drvdata->cdev.dev, &dev_attr_src);
294 if (ret != 0)
295 dev_err(&pdev->dev,
296 "No source control for LED: %d\n", ret);
297
298 return 0;
299
300err_led:
301 led_classdev_unregister(&drvdata->cdev);
302 kfree(drvdata);
303err:
304 return ret;
305}
306
307static int wm831x_status_remove(struct platform_device *pdev)
308{
309 struct wm831x_status *drvdata = platform_get_drvdata(pdev);
310
311 device_remove_file(drvdata->cdev.dev, &dev_attr_src);
312 led_classdev_unregister(&drvdata->cdev);
313 kfree(drvdata);
314
315 return 0;
316}
317
318static struct platform_driver wm831x_status_driver = {
319 .driver = {
320 .name = "wm831x-status",
321 .owner = THIS_MODULE,
322 },
323 .probe = wm831x_status_probe,
324 .remove = wm831x_status_remove,
325};
326
327static int __devinit wm831x_status_init(void)
328{
329 return platform_driver_register(&wm831x_status_driver);
330}
331module_init(wm831x_status_init);
332
333static void wm831x_status_exit(void)
334{
335 platform_driver_unregister(&wm831x_status_driver);
336}
337module_exit(wm831x_status_exit);
338
339MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
340MODULE_DESCRIPTION("WM831x status LED driver");
341MODULE_LICENSE("GPL");
342MODULE_ALIAS("platform:wm831x-status");
343
