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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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
0081e802 MB |
20 | |
21 | /* Microamps */ | |
22 | static const int isink_cur[] = { | |
23 | 4, | |
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86 | 223191 | |
87 | }; | |
88 | ||
89 | #define to_wm8350_led(led_cdev) \ | |
90 | container_of(led_cdev, struct wm8350_led, cdev) | |
91 | ||
92 | static void wm8350_led_enable(struct wm8350_led *led) | |
93 | { | |
94 | int ret; | |
95 | ||
96 | if (led->enabled) | |
97 | return; | |
98 | ||
99 | ret = regulator_enable(led->isink); | |
100 | if (ret != 0) { | |
101 | dev_err(led->cdev.dev, "Failed to enable ISINK: %d\n", ret); | |
102 | return; | |
103 | } | |
104 | ||
105 | ret = regulator_enable(led->dcdc); | |
106 | if (ret != 0) { | |
107 | dev_err(led->cdev.dev, "Failed to enable DCDC: %d\n", ret); | |
108 | regulator_disable(led->isink); | |
109 | return; | |
110 | } | |
111 | ||
112 | led->enabled = 1; | |
113 | } | |
114 | ||
115 | static void wm8350_led_disable(struct wm8350_led *led) | |
116 | { | |
117 | int ret; | |
118 | ||
119 | if (!led->enabled) | |
120 | return; | |
121 | ||
122 | ret = regulator_disable(led->dcdc); | |
123 | if (ret != 0) { | |
124 | dev_err(led->cdev.dev, "Failed to disable DCDC: %d\n", ret); | |
125 | return; | |
126 | } | |
127 | ||
128 | ret = regulator_disable(led->isink); | |
129 | if (ret != 0) { | |
130 | dev_err(led->cdev.dev, "Failed to disable ISINK: %d\n", ret); | |
131 | regulator_enable(led->dcdc); | |
132 | return; | |
133 | } | |
134 | ||
135 | led->enabled = 0; | |
136 | } | |
137 | ||
138 | static void led_work(struct work_struct *work) | |
139 | { | |
140 | struct wm8350_led *led = container_of(work, struct wm8350_led, work); | |
141 | int ret; | |
142 | int uA; | |
143 | unsigned long flags; | |
144 | ||
145 | mutex_lock(&led->mutex); | |
146 | ||
147 | spin_lock_irqsave(&led->value_lock, flags); | |
148 | ||
149 | if (led->value == LED_OFF) { | |
150 | spin_unlock_irqrestore(&led->value_lock, flags); | |
151 | wm8350_led_disable(led); | |
152 | goto out; | |
153 | } | |
154 | ||
155 | /* This scales linearly into the index of valid current | |
156 | * settings which results in a linear scaling of perceived | |
157 | * brightness due to the non-linear current settings provided | |
158 | * by the hardware. | |
159 | */ | |
160 | uA = (led->max_uA_index * led->value) / LED_FULL; | |
161 | spin_unlock_irqrestore(&led->value_lock, flags); | |
162 | BUG_ON(uA >= ARRAY_SIZE(isink_cur)); | |
163 | ||
164 | ret = regulator_set_current_limit(led->isink, isink_cur[uA], | |
165 | isink_cur[uA]); | |
166 | if (ret != 0) | |
167 | dev_err(led->cdev.dev, "Failed to set %duA: %d\n", | |
168 | isink_cur[uA], ret); | |
169 | ||
170 | wm8350_led_enable(led); | |
171 | ||
172 | out: | |
173 | mutex_unlock(&led->mutex); | |
174 | } | |
175 | ||
176 | static void wm8350_led_set(struct led_classdev *led_cdev, | |
177 | enum led_brightness value) | |
178 | { | |
179 | struct wm8350_led *led = to_wm8350_led(led_cdev); | |
180 | unsigned long flags; | |
181 | ||
182 | spin_lock_irqsave(&led->value_lock, flags); | |
183 | led->value = value; | |
184 | schedule_work(&led->work); | |
185 | spin_unlock_irqrestore(&led->value_lock, flags); | |
186 | } | |
187 | ||
0081e802 MB |
188 | static void wm8350_led_shutdown(struct platform_device *pdev) |
189 | { | |
190 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
191 | ||
192 | mutex_lock(&led->mutex); | |
193 | led->value = LED_OFF; | |
194 | wm8350_led_disable(led); | |
195 | mutex_unlock(&led->mutex); | |
196 | } | |
197 | ||
198 | static int wm8350_led_probe(struct platform_device *pdev) | |
199 | { | |
200 | struct regulator *isink, *dcdc; | |
201 | struct wm8350_led *led; | |
202 | struct wm8350_led_platform_data *pdata = pdev->dev.platform_data; | |
203 | int ret, i; | |
204 | ||
205 | if (pdata == NULL) { | |
206 | dev_err(&pdev->dev, "no platform data\n"); | |
207 | return -ENODEV; | |
208 | } | |
209 | ||
210 | if (pdata->max_uA < isink_cur[0]) { | |
211 | dev_err(&pdev->dev, "Invalid maximum current %duA\n", | |
212 | pdata->max_uA); | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | isink = regulator_get(&pdev->dev, "led_isink"); | |
217 | if (IS_ERR(isink)) { | |
218 | printk(KERN_ERR "%s: cant get ISINK\n", __func__); | |
219 | return PTR_ERR(isink); | |
220 | } | |
221 | ||
222 | dcdc = regulator_get(&pdev->dev, "led_vcc"); | |
223 | if (IS_ERR(dcdc)) { | |
224 | printk(KERN_ERR "%s: cant get DCDC\n", __func__); | |
225 | ret = PTR_ERR(dcdc); | |
226 | goto err_isink; | |
227 | } | |
228 | ||
229 | led = kzalloc(sizeof(*led), GFP_KERNEL); | |
230 | if (led == NULL) { | |
231 | ret = -ENOMEM; | |
232 | goto err_dcdc; | |
233 | } | |
234 | ||
235 | led->cdev.brightness_set = wm8350_led_set; | |
236 | led->cdev.default_trigger = pdata->default_trigger; | |
237 | led->cdev.name = pdata->name; | |
859cb7f2 | 238 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
0081e802 MB |
239 | led->enabled = regulator_is_enabled(isink); |
240 | led->isink = isink; | |
241 | led->dcdc = dcdc; | |
242 | ||
243 | for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++) | |
244 | if (isink_cur[i] >= pdata->max_uA) | |
245 | break; | |
246 | led->max_uA_index = i; | |
247 | if (pdata->max_uA != isink_cur[i]) | |
248 | dev_warn(&pdev->dev, | |
249 | "Maximum current %duA is not directly supported," | |
250 | " check platform data\n", | |
251 | pdata->max_uA); | |
252 | ||
253 | spin_lock_init(&led->value_lock); | |
254 | mutex_init(&led->mutex); | |
255 | INIT_WORK(&led->work, led_work); | |
256 | led->value = LED_OFF; | |
257 | platform_set_drvdata(pdev, led); | |
258 | ||
259 | ret = led_classdev_register(&pdev->dev, &led->cdev); | |
260 | if (ret < 0) | |
261 | goto err_led; | |
262 | ||
263 | return 0; | |
264 | ||
265 | err_led: | |
266 | kfree(led); | |
267 | err_dcdc: | |
268 | regulator_put(dcdc); | |
269 | err_isink: | |
270 | regulator_put(isink); | |
271 | return ret; | |
272 | } | |
273 | ||
274 | static int wm8350_led_remove(struct platform_device *pdev) | |
275 | { | |
276 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
277 | ||
278 | led_classdev_unregister(&led->cdev); | |
99ef2121 | 279 | flush_work_sync(&led->work); |
0081e802 MB |
280 | wm8350_led_disable(led); |
281 | regulator_put(led->dcdc); | |
282 | regulator_put(led->isink); | |
283 | kfree(led); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static struct platform_driver wm8350_led_driver = { | |
288 | .driver = { | |
289 | .name = "wm8350-led", | |
290 | .owner = THIS_MODULE, | |
291 | }, | |
292 | .probe = wm8350_led_probe, | |
293 | .remove = wm8350_led_remove, | |
294 | .shutdown = wm8350_led_shutdown, | |
0081e802 MB |
295 | }; |
296 | ||
297 | static int __devinit wm8350_led_init(void) | |
298 | { | |
299 | return platform_driver_register(&wm8350_led_driver); | |
300 | } | |
301 | module_init(wm8350_led_init); | |
302 | ||
303 | static void wm8350_led_exit(void) | |
304 | { | |
305 | platform_driver_unregister(&wm8350_led_driver); | |
306 | } | |
307 | module_exit(wm8350_led_exit); | |
308 | ||
309 | MODULE_AUTHOR("Mark Brown"); | |
310 | MODULE_DESCRIPTION("WM8350 LED driver"); | |
311 | MODULE_LICENSE("GPL"); | |
312 | MODULE_ALIAS("platform:wm8350-led"); |