2 * LED driver for WM8350 driven LEDS.
4 * Copyright(C) 2007, 2008 Wolfson Microelectronics PLC.
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.
12 #include <linux/kernel.h>
13 #include <linux/platform_device.h>
14 #include <linux/leds.h>
15 #include <linux/err.h>
16 #include <linux/mfd/wm8350/pmic.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/slab.h>
19 #include <linux/module.h>
22 static const int isink_cur[] = {
89 #define to_wm8350_led(led_cdev) \
90 container_of(led_cdev, struct wm8350_led, cdev)
92 static int wm8350_led_enable(struct wm8350_led *led)
99 ret = regulator_enable(led->isink);
101 dev_err(led->cdev.dev, "Failed to enable ISINK: %d\n", ret);
105 ret = regulator_enable(led->dcdc);
107 dev_err(led->cdev.dev, "Failed to enable DCDC: %d\n", ret);
108 regulator_disable(led->isink);
117 static int wm8350_led_disable(struct wm8350_led *led)
124 ret = regulator_disable(led->dcdc);
126 dev_err(led->cdev.dev, "Failed to disable DCDC: %d\n", ret);
130 ret = regulator_disable(led->isink);
132 dev_err(led->cdev.dev, "Failed to disable ISINK: %d\n", ret);
133 ret = regulator_enable(led->dcdc);
135 dev_err(led->cdev.dev, "Failed to reenable DCDC: %d\n",
145 static int wm8350_led_set(struct led_classdev *led_cdev,
146 enum led_brightness value)
148 struct wm8350_led *led = to_wm8350_led(led_cdev);
155 spin_lock_irqsave(&led->value_lock, flags);
157 if (led->value == LED_OFF) {
158 spin_unlock_irqrestore(&led->value_lock, flags);
159 return wm8350_led_disable(led);
162 /* This scales linearly into the index of valid current
163 * settings which results in a linear scaling of perceived
164 * brightness due to the non-linear current settings provided
167 uA = (led->max_uA_index * led->value) / LED_FULL;
168 spin_unlock_irqrestore(&led->value_lock, flags);
169 BUG_ON(uA >= ARRAY_SIZE(isink_cur));
171 ret = regulator_set_current_limit(led->isink, isink_cur[uA],
174 dev_err(led->cdev.dev, "Failed to set %duA: %d\n",
179 return wm8350_led_enable(led);
182 static void wm8350_led_shutdown(struct platform_device *pdev)
184 struct wm8350_led *led = platform_get_drvdata(pdev);
186 led->value = LED_OFF;
187 wm8350_led_disable(led);
190 static int wm8350_led_probe(struct platform_device *pdev)
192 struct regulator *isink, *dcdc;
193 struct wm8350_led *led;
194 struct wm8350_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
198 dev_err(&pdev->dev, "no platform data\n");
202 if (pdata->max_uA < isink_cur[0]) {
203 dev_err(&pdev->dev, "Invalid maximum current %duA\n",
208 isink = devm_regulator_get(&pdev->dev, "led_isink");
210 dev_err(&pdev->dev, "%s: can't get ISINK\n", __func__);
211 return PTR_ERR(isink);
214 dcdc = devm_regulator_get(&pdev->dev, "led_vcc");
216 dev_err(&pdev->dev, "%s: can't get DCDC\n", __func__);
217 return PTR_ERR(dcdc);
220 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
224 led->cdev.brightness_set_blocking = wm8350_led_set;
225 led->cdev.default_trigger = pdata->default_trigger;
226 led->cdev.name = pdata->name;
227 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
228 led->enabled = regulator_is_enabled(isink);
232 for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++)
233 if (isink_cur[i] >= pdata->max_uA)
235 led->max_uA_index = i;
236 if (pdata->max_uA != isink_cur[i])
238 "Maximum current %duA is not directly supported,"
239 " check platform data\n",
242 spin_lock_init(&led->value_lock);
243 led->value = LED_OFF;
244 platform_set_drvdata(pdev, led);
246 return led_classdev_register(&pdev->dev, &led->cdev);
249 static int wm8350_led_remove(struct platform_device *pdev)
251 struct wm8350_led *led = platform_get_drvdata(pdev);
253 led_classdev_unregister(&led->cdev);
254 wm8350_led_disable(led);
258 static struct platform_driver wm8350_led_driver = {
260 .name = "wm8350-led",
262 .probe = wm8350_led_probe,
263 .remove = wm8350_led_remove,
264 .shutdown = wm8350_led_shutdown,
267 module_platform_driver(wm8350_led_driver);
269 MODULE_AUTHOR("Mark Brown");
270 MODULE_DESCRIPTION("WM8350 LED driver");
271 MODULE_LICENSE("GPL");
272 MODULE_ALIAS("platform:wm8350-led");