Root/
1 | /* |
2 | * LED driver for WM831x status LEDs |
3 | * |
4 | * Copyright(C) 2009 Wolfson Microelectronics PLC. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License version 2 as |
8 | * published by the Free Software Foundation. |
9 | * |
10 | */ |
11 | |
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 | #include <linux/module.h> |
22 | |
23 | |
24 | struct wm831x_status { |
25 | struct led_classdev cdev; |
26 | struct wm831x *wm831x; |
27 | struct work_struct work; |
28 | struct mutex mutex; |
29 | |
30 | spinlock_t value_lock; |
31 | int reg; /* Control register */ |
32 | int reg_val; /* Control register value */ |
33 | |
34 | int blink; |
35 | int blink_time; |
36 | int blink_cyc; |
37 | int src; |
38 | enum led_brightness brightness; |
39 | }; |
40 | |
41 | #define to_wm831x_status(led_cdev) \ |
42 | container_of(led_cdev, struct wm831x_status, cdev) |
43 | |
44 | static void wm831x_status_work(struct work_struct *work) |
45 | { |
46 | struct wm831x_status *led = container_of(work, struct wm831x_status, |
47 | work); |
48 | unsigned long flags; |
49 | |
50 | mutex_lock(&led->mutex); |
51 | |
52 | led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK | |
53 | WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK); |
54 | |
55 | spin_lock_irqsave(&led->value_lock, flags); |
56 | |
57 | led->reg_val |= led->src << WM831X_LED_SRC_SHIFT; |
58 | if (led->blink) { |
59 | led->reg_val |= 2 << WM831X_LED_MODE_SHIFT; |
60 | led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT; |
61 | led->reg_val |= led->blink_cyc; |
62 | } else { |
63 | if (led->brightness != LED_OFF) |
64 | led->reg_val |= 1 << WM831X_LED_MODE_SHIFT; |
65 | } |
66 | |
67 | spin_unlock_irqrestore(&led->value_lock, flags); |
68 | |
69 | wm831x_reg_write(led->wm831x, led->reg, led->reg_val); |
70 | |
71 | mutex_unlock(&led->mutex); |
72 | } |
73 | |
74 | static void wm831x_status_set(struct led_classdev *led_cdev, |
75 | enum led_brightness value) |
76 | { |
77 | struct wm831x_status *led = to_wm831x_status(led_cdev); |
78 | unsigned long flags; |
79 | |
80 | spin_lock_irqsave(&led->value_lock, flags); |
81 | led->brightness = value; |
82 | if (value == LED_OFF) |
83 | led->blink = 0; |
84 | schedule_work(&led->work); |
85 | spin_unlock_irqrestore(&led->value_lock, flags); |
86 | } |
87 | |
88 | static int wm831x_status_blink_set(struct led_classdev *led_cdev, |
89 | unsigned long *delay_on, |
90 | unsigned long *delay_off) |
91 | { |
92 | struct wm831x_status *led = to_wm831x_status(led_cdev); |
93 | unsigned long flags; |
94 | int ret = 0; |
95 | |
96 | /* Pick some defaults if we've not been given times */ |
97 | if (*delay_on == 0 && *delay_off == 0) { |
98 | *delay_on = 250; |
99 | *delay_off = 250; |
100 | } |
101 | |
102 | spin_lock_irqsave(&led->value_lock, flags); |
103 | |
104 | /* We only have a limited selection of settings, see if we can |
105 | * support the configuration we're being given */ |
106 | switch (*delay_on) { |
107 | case 1000: |
108 | led->blink_time = 0; |
109 | break; |
110 | case 250: |
111 | led->blink_time = 1; |
112 | break; |
113 | case 125: |
114 | led->blink_time = 2; |
115 | break; |
116 | case 62: |
117 | case 63: |
118 | /* Actually 62.5ms */ |
119 | led->blink_time = 3; |
120 | break; |
121 | default: |
122 | ret = -EINVAL; |
123 | break; |
124 | } |
125 | |
126 | if (ret == 0) { |
127 | switch (*delay_off / *delay_on) { |
128 | case 1: |
129 | led->blink_cyc = 0; |
130 | break; |
131 | case 3: |
132 | led->blink_cyc = 1; |
133 | break; |
134 | case 4: |
135 | led->blink_cyc = 2; |
136 | break; |
137 | case 8: |
138 | led->blink_cyc = 3; |
139 | break; |
140 | default: |
141 | ret = -EINVAL; |
142 | break; |
143 | } |
144 | } |
145 | |
146 | if (ret == 0) |
147 | led->blink = 1; |
148 | else |
149 | led->blink = 0; |
150 | |
151 | /* Always update; if we fail turn off blinking since we expect |
152 | * a software fallback. */ |
153 | schedule_work(&led->work); |
154 | |
155 | spin_unlock_irqrestore(&led->value_lock, flags); |
156 | |
157 | return ret; |
158 | } |
159 | |
160 | static const char * const led_src_texts[] = { |
161 | "otp", |
162 | "power", |
163 | "charger", |
164 | "soft", |
165 | }; |
166 | |
167 | static ssize_t wm831x_status_src_show(struct device *dev, |
168 | struct device_attribute *attr, char *buf) |
169 | { |
170 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
171 | struct wm831x_status *led = to_wm831x_status(led_cdev); |
172 | int i; |
173 | ssize_t ret = 0; |
174 | |
175 | mutex_lock(&led->mutex); |
176 | |
177 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) |
178 | if (i == led->src) |
179 | ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]); |
180 | else |
181 | ret += sprintf(&buf[ret], "%s ", led_src_texts[i]); |
182 | |
183 | mutex_unlock(&led->mutex); |
184 | |
185 | ret += sprintf(&buf[ret], "\n"); |
186 | |
187 | return ret; |
188 | } |
189 | |
190 | static ssize_t wm831x_status_src_store(struct device *dev, |
191 | struct device_attribute *attr, |
192 | const char *buf, size_t size) |
193 | { |
194 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
195 | struct wm831x_status *led = to_wm831x_status(led_cdev); |
196 | char name[20]; |
197 | int i; |
198 | size_t len; |
199 | |
200 | name[sizeof(name) - 1] = '\0'; |
201 | strncpy(name, buf, sizeof(name) - 1); |
202 | len = strlen(name); |
203 | |
204 | if (len && name[len - 1] == '\n') |
205 | name[len - 1] = '\0'; |
206 | |
207 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) { |
208 | if (!strcmp(name, led_src_texts[i])) { |
209 | mutex_lock(&led->mutex); |
210 | |
211 | led->src = i; |
212 | schedule_work(&led->work); |
213 | |
214 | mutex_unlock(&led->mutex); |
215 | } |
216 | } |
217 | |
218 | return size; |
219 | } |
220 | |
221 | static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store); |
222 | |
223 | static int wm831x_status_probe(struct platform_device *pdev) |
224 | { |
225 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); |
226 | struct wm831x_pdata *chip_pdata; |
227 | struct wm831x_status_pdata pdata; |
228 | struct wm831x_status *drvdata; |
229 | struct resource *res; |
230 | int id = pdev->id % ARRAY_SIZE(chip_pdata->status); |
231 | int ret; |
232 | |
233 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
234 | if (res == NULL) { |
235 | dev_err(&pdev->dev, "No I/O resource\n"); |
236 | ret = -EINVAL; |
237 | goto err; |
238 | } |
239 | |
240 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status), |
241 | GFP_KERNEL); |
242 | if (!drvdata) |
243 | return -ENOMEM; |
244 | dev_set_drvdata(&pdev->dev, drvdata); |
245 | |
246 | drvdata->wm831x = wm831x; |
247 | drvdata->reg = res->start; |
248 | |
249 | if (wm831x->dev->platform_data) |
250 | chip_pdata = wm831x->dev->platform_data; |
251 | else |
252 | chip_pdata = NULL; |
253 | |
254 | memset(&pdata, 0, sizeof(pdata)); |
255 | if (chip_pdata && chip_pdata->status[id]) |
256 | memcpy(&pdata, chip_pdata->status[id], sizeof(pdata)); |
257 | else |
258 | pdata.name = dev_name(&pdev->dev); |
259 | |
260 | mutex_init(&drvdata->mutex); |
261 | INIT_WORK(&drvdata->work, wm831x_status_work); |
262 | spin_lock_init(&drvdata->value_lock); |
263 | |
264 | /* We cache the configuration register and read startup values |
265 | * from it. */ |
266 | drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg); |
267 | |
268 | if (drvdata->reg_val & WM831X_LED_MODE_MASK) |
269 | drvdata->brightness = LED_FULL; |
270 | else |
271 | drvdata->brightness = LED_OFF; |
272 | |
273 | /* Set a default source if configured, otherwise leave the |
274 | * current hardware setting. |
275 | */ |
276 | if (pdata.default_src == WM831X_STATUS_PRESERVE) { |
277 | drvdata->src = drvdata->reg_val; |
278 | drvdata->src &= WM831X_LED_SRC_MASK; |
279 | drvdata->src >>= WM831X_LED_SRC_SHIFT; |
280 | } else { |
281 | drvdata->src = pdata.default_src - 1; |
282 | } |
283 | |
284 | drvdata->cdev.name = pdata.name; |
285 | drvdata->cdev.default_trigger = pdata.default_trigger; |
286 | drvdata->cdev.brightness_set = wm831x_status_set; |
287 | drvdata->cdev.blink_set = wm831x_status_blink_set; |
288 | |
289 | ret = led_classdev_register(wm831x->dev, &drvdata->cdev); |
290 | if (ret < 0) { |
291 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); |
292 | goto err_led; |
293 | } |
294 | |
295 | ret = device_create_file(drvdata->cdev.dev, &dev_attr_src); |
296 | if (ret != 0) |
297 | dev_err(&pdev->dev, |
298 | "No source control for LED: %d\n", ret); |
299 | |
300 | return 0; |
301 | |
302 | err_led: |
303 | led_classdev_unregister(&drvdata->cdev); |
304 | err: |
305 | return ret; |
306 | } |
307 | |
308 | static int wm831x_status_remove(struct platform_device *pdev) |
309 | { |
310 | struct wm831x_status *drvdata = platform_get_drvdata(pdev); |
311 | |
312 | device_remove_file(drvdata->cdev.dev, &dev_attr_src); |
313 | led_classdev_unregister(&drvdata->cdev); |
314 | |
315 | return 0; |
316 | } |
317 | |
318 | static 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 | |
327 | module_platform_driver(wm831x_status_driver); |
328 | |
329 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
330 | MODULE_DESCRIPTION("WM831x status LED driver"); |
331 | MODULE_LICENSE("GPL"); |
332 | MODULE_ALIAS("platform:wm831x-status"); |
333 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9