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1 | /* |
2 | * LED driver for WM8350 driven LEDS. | |
3 | * | |
4 | * Copyright(C) 2007, 2008 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/wm8350/pmic.h> | |
18 | #include <linux/regulator/consumer.h> | |
19 | ||
20 | /* Microamps */ | |
21 | static const int isink_cur[] = { | |
22 | 4, | |
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85 | 223191 | |
86 | }; | |
87 | ||
88 | #define to_wm8350_led(led_cdev) \ | |
89 | container_of(led_cdev, struct wm8350_led, cdev) | |
90 | ||
91 | static void wm8350_led_enable(struct wm8350_led *led) | |
92 | { | |
93 | int ret; | |
94 | ||
95 | if (led->enabled) | |
96 | return; | |
97 | ||
98 | ret = regulator_enable(led->isink); | |
99 | if (ret != 0) { | |
100 | dev_err(led->cdev.dev, "Failed to enable ISINK: %d\n", ret); | |
101 | return; | |
102 | } | |
103 | ||
104 | ret = regulator_enable(led->dcdc); | |
105 | if (ret != 0) { | |
106 | dev_err(led->cdev.dev, "Failed to enable DCDC: %d\n", ret); | |
107 | regulator_disable(led->isink); | |
108 | return; | |
109 | } | |
110 | ||
111 | led->enabled = 1; | |
112 | } | |
113 | ||
114 | static void wm8350_led_disable(struct wm8350_led *led) | |
115 | { | |
116 | int ret; | |
117 | ||
118 | if (!led->enabled) | |
119 | return; | |
120 | ||
121 | ret = regulator_disable(led->dcdc); | |
122 | if (ret != 0) { | |
123 | dev_err(led->cdev.dev, "Failed to disable DCDC: %d\n", ret); | |
124 | return; | |
125 | } | |
126 | ||
127 | ret = regulator_disable(led->isink); | |
128 | if (ret != 0) { | |
129 | dev_err(led->cdev.dev, "Failed to disable ISINK: %d\n", ret); | |
130 | regulator_enable(led->dcdc); | |
131 | return; | |
132 | } | |
133 | ||
134 | led->enabled = 0; | |
135 | } | |
136 | ||
137 | static void led_work(struct work_struct *work) | |
138 | { | |
139 | struct wm8350_led *led = container_of(work, struct wm8350_led, work); | |
140 | int ret; | |
141 | int uA; | |
142 | unsigned long flags; | |
143 | ||
144 | mutex_lock(&led->mutex); | |
145 | ||
146 | spin_lock_irqsave(&led->value_lock, flags); | |
147 | ||
148 | if (led->value == LED_OFF) { | |
149 | spin_unlock_irqrestore(&led->value_lock, flags); | |
150 | wm8350_led_disable(led); | |
151 | goto out; | |
152 | } | |
153 | ||
154 | /* This scales linearly into the index of valid current | |
155 | * settings which results in a linear scaling of perceived | |
156 | * brightness due to the non-linear current settings provided | |
157 | * by the hardware. | |
158 | */ | |
159 | uA = (led->max_uA_index * led->value) / LED_FULL; | |
160 | spin_unlock_irqrestore(&led->value_lock, flags); | |
161 | BUG_ON(uA >= ARRAY_SIZE(isink_cur)); | |
162 | ||
163 | ret = regulator_set_current_limit(led->isink, isink_cur[uA], | |
164 | isink_cur[uA]); | |
165 | if (ret != 0) | |
166 | dev_err(led->cdev.dev, "Failed to set %duA: %d\n", | |
167 | isink_cur[uA], ret); | |
168 | ||
169 | wm8350_led_enable(led); | |
170 | ||
171 | out: | |
172 | mutex_unlock(&led->mutex); | |
173 | } | |
174 | ||
175 | static void wm8350_led_set(struct led_classdev *led_cdev, | |
176 | enum led_brightness value) | |
177 | { | |
178 | struct wm8350_led *led = to_wm8350_led(led_cdev); | |
179 | unsigned long flags; | |
180 | ||
181 | spin_lock_irqsave(&led->value_lock, flags); | |
182 | led->value = value; | |
183 | schedule_work(&led->work); | |
184 | spin_unlock_irqrestore(&led->value_lock, flags); | |
185 | } | |
186 | ||
187 | #ifdef CONFIG_PM | |
188 | static int wm8350_led_suspend(struct platform_device *pdev, pm_message_t state) | |
189 | { | |
190 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
191 | ||
192 | led_classdev_suspend(&led->cdev); | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int wm8350_led_resume(struct platform_device *pdev) | |
197 | { | |
198 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
199 | ||
200 | led_classdev_resume(&led->cdev); | |
201 | return 0; | |
202 | } | |
203 | #else | |
204 | #define wm8350_led_suspend NULL | |
205 | #define wm8350_led_resume NULL | |
206 | #endif | |
207 | ||
208 | static void wm8350_led_shutdown(struct platform_device *pdev) | |
209 | { | |
210 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
211 | ||
212 | mutex_lock(&led->mutex); | |
213 | led->value = LED_OFF; | |
214 | wm8350_led_disable(led); | |
215 | mutex_unlock(&led->mutex); | |
216 | } | |
217 | ||
218 | static int wm8350_led_probe(struct platform_device *pdev) | |
219 | { | |
220 | struct regulator *isink, *dcdc; | |
221 | struct wm8350_led *led; | |
222 | struct wm8350_led_platform_data *pdata = pdev->dev.platform_data; | |
223 | int ret, i; | |
224 | ||
225 | if (pdata == NULL) { | |
226 | dev_err(&pdev->dev, "no platform data\n"); | |
227 | return -ENODEV; | |
228 | } | |
229 | ||
230 | if (pdata->max_uA < isink_cur[0]) { | |
231 | dev_err(&pdev->dev, "Invalid maximum current %duA\n", | |
232 | pdata->max_uA); | |
233 | return -EINVAL; | |
234 | } | |
235 | ||
236 | isink = regulator_get(&pdev->dev, "led_isink"); | |
237 | if (IS_ERR(isink)) { | |
238 | printk(KERN_ERR "%s: cant get ISINK\n", __func__); | |
239 | return PTR_ERR(isink); | |
240 | } | |
241 | ||
242 | dcdc = regulator_get(&pdev->dev, "led_vcc"); | |
243 | if (IS_ERR(dcdc)) { | |
244 | printk(KERN_ERR "%s: cant get DCDC\n", __func__); | |
245 | ret = PTR_ERR(dcdc); | |
246 | goto err_isink; | |
247 | } | |
248 | ||
249 | led = kzalloc(sizeof(*led), GFP_KERNEL); | |
250 | if (led == NULL) { | |
251 | ret = -ENOMEM; | |
252 | goto err_dcdc; | |
253 | } | |
254 | ||
255 | led->cdev.brightness_set = wm8350_led_set; | |
256 | led->cdev.default_trigger = pdata->default_trigger; | |
257 | led->cdev.name = pdata->name; | |
258 | led->enabled = regulator_is_enabled(isink); | |
259 | led->isink = isink; | |
260 | led->dcdc = dcdc; | |
261 | ||
262 | for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++) | |
263 | if (isink_cur[i] >= pdata->max_uA) | |
264 | break; | |
265 | led->max_uA_index = i; | |
266 | if (pdata->max_uA != isink_cur[i]) | |
267 | dev_warn(&pdev->dev, | |
268 | "Maximum current %duA is not directly supported," | |
269 | " check platform data\n", | |
270 | pdata->max_uA); | |
271 | ||
272 | spin_lock_init(&led->value_lock); | |
273 | mutex_init(&led->mutex); | |
274 | INIT_WORK(&led->work, led_work); | |
275 | led->value = LED_OFF; | |
276 | platform_set_drvdata(pdev, led); | |
277 | ||
278 | ret = led_classdev_register(&pdev->dev, &led->cdev); | |
279 | if (ret < 0) | |
280 | goto err_led; | |
281 | ||
282 | return 0; | |
283 | ||
284 | err_led: | |
285 | kfree(led); | |
286 | err_dcdc: | |
287 | regulator_put(dcdc); | |
288 | err_isink: | |
289 | regulator_put(isink); | |
290 | return ret; | |
291 | } | |
292 | ||
293 | static int wm8350_led_remove(struct platform_device *pdev) | |
294 | { | |
295 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
296 | ||
297 | led_classdev_unregister(&led->cdev); | |
298 | flush_scheduled_work(); | |
299 | wm8350_led_disable(led); | |
300 | regulator_put(led->dcdc); | |
301 | regulator_put(led->isink); | |
302 | kfree(led); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static struct platform_driver wm8350_led_driver = { | |
307 | .driver = { | |
308 | .name = "wm8350-led", | |
309 | .owner = THIS_MODULE, | |
310 | }, | |
311 | .probe = wm8350_led_probe, | |
312 | .remove = wm8350_led_remove, | |
313 | .shutdown = wm8350_led_shutdown, | |
314 | .suspend = wm8350_led_suspend, | |
315 | .resume = wm8350_led_resume, | |
316 | }; | |
317 | ||
318 | static int __devinit wm8350_led_init(void) | |
319 | { | |
320 | return platform_driver_register(&wm8350_led_driver); | |
321 | } | |
322 | module_init(wm8350_led_init); | |
323 | ||
324 | static void wm8350_led_exit(void) | |
325 | { | |
326 | platform_driver_unregister(&wm8350_led_driver); | |
327 | } | |
328 | module_exit(wm8350_led_exit); | |
329 | ||
330 | MODULE_AUTHOR("Mark Brown"); | |
331 | MODULE_DESCRIPTION("WM8350 LED driver"); | |
332 | MODULE_LICENSE("GPL"); | |
333 | MODULE_ALIAS("platform:wm8350-led"); |