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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/leds.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/mfd/wm831x/core.h> | |
18 | #include <linux/mfd/wm831x/pdata.h> | |
19 | #include <linux/mfd/wm831x/status.h> | |
20 | ||
21 | ||
22 | struct wm831x_status { | |
23 | struct led_classdev cdev; | |
24 | struct wm831x *wm831x; | |
25 | struct work_struct work; | |
26 | struct mutex mutex; | |
27 | ||
28 | spinlock_t value_lock; | |
29 | int reg; /* Control register */ | |
30 | int reg_val; /* Control register value */ | |
31 | ||
32 | int blink; | |
33 | int blink_time; | |
34 | int blink_cyc; | |
35 | int src; | |
36 | enum led_brightness brightness; | |
37 | }; | |
38 | ||
39 | #define to_wm831x_status(led_cdev) \ | |
40 | container_of(led_cdev, struct wm831x_status, cdev) | |
41 | ||
42 | static void wm831x_status_work(struct work_struct *work) | |
43 | { | |
44 | struct wm831x_status *led = container_of(work, struct wm831x_status, | |
45 | work); | |
46 | unsigned long flags; | |
47 | ||
48 | mutex_lock(&led->mutex); | |
49 | ||
50 | led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK | | |
51 | WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK); | |
52 | ||
53 | spin_lock_irqsave(&led->value_lock, flags); | |
54 | ||
55 | led->reg_val |= led->src << WM831X_LED_SRC_SHIFT; | |
56 | if (led->blink) { | |
57 | led->reg_val |= 2 << WM831X_LED_MODE_SHIFT; | |
58 | led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT; | |
59 | led->reg_val |= led->blink_cyc; | |
60 | } else { | |
61 | if (led->brightness != LED_OFF) | |
62 | led->reg_val |= 1 << WM831X_LED_MODE_SHIFT; | |
63 | } | |
64 | ||
65 | spin_unlock_irqrestore(&led->value_lock, flags); | |
66 | ||
67 | wm831x_reg_write(led->wm831x, led->reg, led->reg_val); | |
68 | ||
69 | mutex_unlock(&led->mutex); | |
70 | } | |
71 | ||
72 | static void wm831x_status_set(struct led_classdev *led_cdev, | |
73 | enum led_brightness value) | |
74 | { | |
75 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
76 | unsigned long flags; | |
77 | ||
78 | spin_lock_irqsave(&led->value_lock, flags); | |
79 | led->brightness = value; | |
80 | if (value == LED_OFF) | |
81 | led->blink = 0; | |
82 | schedule_work(&led->work); | |
83 | spin_unlock_irqrestore(&led->value_lock, flags); | |
84 | } | |
85 | ||
86 | static int wm831x_status_blink_set(struct led_classdev *led_cdev, | |
87 | unsigned long *delay_on, | |
88 | unsigned long *delay_off) | |
89 | { | |
90 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
91 | unsigned long flags; | |
92 | int ret = 0; | |
93 | ||
94 | /* Pick some defaults if we've not been given times */ | |
95 | if (*delay_on == 0 && *delay_off == 0) { | |
96 | *delay_on = 250; | |
97 | *delay_off = 250; | |
98 | } | |
99 | ||
100 | spin_lock_irqsave(&led->value_lock, flags); | |
101 | ||
102 | /* We only have a limited selection of settings, see if we can | |
103 | * support the configuration we're being given */ | |
104 | switch (*delay_on) { | |
105 | case 1000: | |
106 | led->blink_time = 0; | |
107 | break; | |
108 | case 250: | |
109 | led->blink_time = 1; | |
110 | break; | |
111 | case 125: | |
112 | led->blink_time = 2; | |
113 | break; | |
114 | case 62: | |
115 | case 63: | |
116 | /* Actually 62.5ms */ | |
117 | led->blink_time = 3; | |
118 | break; | |
119 | default: | |
120 | ret = -EINVAL; | |
121 | break; | |
122 | } | |
123 | ||
124 | if (ret == 0) { | |
125 | switch (*delay_off / *delay_on) { | |
126 | case 1: | |
127 | led->blink_cyc = 0; | |
128 | break; | |
129 | case 3: | |
130 | led->blink_cyc = 1; | |
131 | break; | |
132 | case 4: | |
133 | led->blink_cyc = 2; | |
134 | break; | |
135 | case 8: | |
136 | led->blink_cyc = 3; | |
137 | break; | |
138 | default: | |
139 | ret = -EINVAL; | |
140 | break; | |
141 | } | |
142 | } | |
143 | ||
144 | if (ret == 0) | |
145 | led->blink = 1; | |
146 | else | |
147 | led->blink = 0; | |
148 | ||
149 | /* Always update; if we fail turn off blinking since we expect | |
150 | * a software fallback. */ | |
151 | schedule_work(&led->work); | |
152 | ||
153 | spin_unlock_irqrestore(&led->value_lock, flags); | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | static const char *led_src_texts[] = { | |
159 | "otp", | |
160 | "power", | |
161 | "charger", | |
162 | "soft", | |
163 | }; | |
164 | ||
165 | static ssize_t wm831x_status_src_show(struct device *dev, | |
166 | struct device_attribute *attr, char *buf) | |
167 | { | |
168 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
169 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
170 | int i; | |
171 | ssize_t ret = 0; | |
172 | ||
173 | mutex_lock(&led->mutex); | |
174 | ||
175 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) | |
176 | if (i == led->src) | |
177 | ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]); | |
178 | else | |
179 | ret += sprintf(&buf[ret], "%s ", led_src_texts[i]); | |
180 | ||
181 | mutex_unlock(&led->mutex); | |
182 | ||
183 | ret += sprintf(&buf[ret], "\n"); | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
188 | static ssize_t wm831x_status_src_store(struct device *dev, | |
189 | struct device_attribute *attr, | |
190 | const char *buf, size_t size) | |
191 | { | |
192 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
193 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
194 | char name[20]; | |
195 | int i; | |
196 | size_t len; | |
197 | ||
198 | name[sizeof(name) - 1] = '\0'; | |
199 | strncpy(name, buf, sizeof(name) - 1); | |
200 | len = strlen(name); | |
201 | ||
202 | if (len && name[len - 1] == '\n') | |
203 | name[len - 1] = '\0'; | |
204 | ||
205 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) { | |
206 | if (!strcmp(name, led_src_texts[i])) { | |
207 | mutex_lock(&led->mutex); | |
208 | ||
209 | led->src = i; | |
210 | schedule_work(&led->work); | |
211 | ||
212 | mutex_unlock(&led->mutex); | |
213 | } | |
214 | } | |
215 | ||
216 | return size; | |
217 | } | |
218 | ||
219 | static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store); | |
220 | ||
221 | static int wm831x_status_probe(struct platform_device *pdev) | |
222 | { | |
223 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
224 | struct wm831x_pdata *chip_pdata; | |
225 | struct wm831x_status_pdata pdata; | |
226 | struct wm831x_status *drvdata; | |
227 | struct resource *res; | |
228 | int id = pdev->id % ARRAY_SIZE(chip_pdata->status); | |
229 | int ret; | |
230 | ||
231 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
232 | if (res == NULL) { | |
233 | dev_err(&pdev->dev, "No I/O resource\n"); | |
234 | ret = -EINVAL; | |
235 | goto err; | |
236 | } | |
237 | ||
238 | drvdata = kzalloc(sizeof(struct wm831x_status), GFP_KERNEL); | |
239 | if (!drvdata) | |
240 | return -ENOMEM; | |
241 | dev_set_drvdata(&pdev->dev, drvdata); | |
242 | ||
243 | drvdata->wm831x = wm831x; | |
244 | drvdata->reg = res->start; | |
245 | ||
246 | if (wm831x->dev->platform_data) | |
247 | chip_pdata = wm831x->dev->platform_data; | |
248 | else | |
249 | chip_pdata = NULL; | |
250 | ||
251 | memset(&pdata, 0, sizeof(pdata)); | |
252 | if (chip_pdata && chip_pdata->status[id]) | |
253 | memcpy(&pdata, chip_pdata->status[id], sizeof(pdata)); | |
254 | else | |
255 | pdata.name = dev_name(&pdev->dev); | |
256 | ||
257 | mutex_init(&drvdata->mutex); | |
258 | INIT_WORK(&drvdata->work, wm831x_status_work); | |
259 | spin_lock_init(&drvdata->value_lock); | |
260 | ||
261 | /* We cache the configuration register and read startup values | |
262 | * from it. */ | |
263 | drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg); | |
264 | ||
265 | if (drvdata->reg_val & WM831X_LED_MODE_MASK) | |
266 | drvdata->brightness = LED_FULL; | |
267 | else | |
268 | drvdata->brightness = LED_OFF; | |
269 | ||
270 | /* Set a default source if configured, otherwise leave the | |
271 | * current hardware setting. | |
272 | */ | |
273 | if (pdata.default_src == WM831X_STATUS_PRESERVE) { | |
274 | drvdata->src = drvdata->reg_val; | |
275 | drvdata->src &= WM831X_LED_SRC_MASK; | |
276 | drvdata->src >>= WM831X_LED_SRC_SHIFT; | |
277 | } else { | |
278 | drvdata->src = pdata.default_src - 1; | |
279 | } | |
280 | ||
281 | drvdata->cdev.name = pdata.name; | |
282 | drvdata->cdev.default_trigger = pdata.default_trigger; | |
283 | drvdata->cdev.brightness_set = wm831x_status_set; | |
284 | drvdata->cdev.blink_set = wm831x_status_blink_set; | |
285 | ||
286 | ret = led_classdev_register(wm831x->dev, &drvdata->cdev); | |
287 | if (ret < 0) { | |
288 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); | |
289 | goto err_led; | |
290 | } | |
291 | ||
292 | ret = device_create_file(drvdata->cdev.dev, &dev_attr_src); | |
293 | if (ret != 0) | |
294 | dev_err(&pdev->dev, | |
295 | "No source control for LED: %d\n", ret); | |
296 | ||
297 | return 0; | |
298 | ||
299 | err_led: | |
300 | led_classdev_unregister(&drvdata->cdev); | |
301 | kfree(drvdata); | |
302 | err: | |
303 | return ret; | |
304 | } | |
305 | ||
306 | static int wm831x_status_remove(struct platform_device *pdev) | |
307 | { | |
308 | struct wm831x_status *drvdata = platform_get_drvdata(pdev); | |
309 | ||
310 | device_remove_file(drvdata->cdev.dev, &dev_attr_src); | |
311 | led_classdev_unregister(&drvdata->cdev); | |
312 | kfree(drvdata); | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static struct platform_driver wm831x_status_driver = { | |
318 | .driver = { | |
319 | .name = "wm831x-status", | |
320 | .owner = THIS_MODULE, | |
321 | }, | |
322 | .probe = wm831x_status_probe, | |
323 | .remove = wm831x_status_remove, | |
324 | }; | |
325 | ||
326 | static int __devinit wm831x_status_init(void) | |
327 | { | |
328 | return platform_driver_register(&wm831x_status_driver); | |
329 | } | |
330 | module_init(wm831x_status_init); | |
331 | ||
332 | static void wm831x_status_exit(void) | |
333 | { | |
334 | platform_driver_unregister(&wm831x_status_driver); | |
335 | } | |
336 | module_exit(wm831x_status_exit); | |
337 | ||
338 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
339 | MODULE_DESCRIPTION("WM831x status LED driver"); | |
340 | MODULE_LICENSE("GPL"); | |
341 | MODULE_ALIAS("platform:wm831x-status"); |