1 files changed, 333 insertions, 0 deletions

diff --git a/drivers/leds/leds-wm8350.c b/drivers/leds/leds-wm8350.c
new file mode 100644
index 000000000000..846ed978103f
--- /dev/null
+++ b/drivers/leds/leds-wm8350.c
@@ -0,0 +1,333 @@
+/*
+ * LED driver for WM8350 driven LEDS.
+ *
+ * Copyright(C) 2007, 2008 Wolfson Microelectronics PLC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/mfd/wm8350/pmic.h>
+#include <linux/regulator/consumer.h>
+
+/* Microamps */
+static const int isink_cur[] = {
+        4,
+        5,
+        6,
+        7,
+        8,
+        10,
+        11,
+        14,
+        16,
+        19,
+        23,
+        27,
+        32,
+        39,
+        46,
+        54,
+        65,
+        77,
+        92,
+        109,
+        130,
+        154,
+        183,
+        218,
+        259,
+        308,
+        367,
+        436,
+        518,
+        616,
+        733,
+        872,
+        1037,
+        1233,
+        1466,
+        1744,
+        2073,
+        2466,
+        2933,
+        3487,
+        4147,
+        4932,
+        5865,
+        6975,
+        8294,
+        9864,
+        11730,
+        13949,
+        16589,
+        19728,
+        23460,
+        27899,
+        33178,
+        39455,
+        46920,
+        55798,
+        66355,
+        78910,
+        93840,
+        111596,
+        132710,
+        157820,
+        187681,
+        223191
+};
+
+#define to_wm8350_led(led_cdev) \
+        container_of(led_cdev, struct wm8350_led, cdev)
+
+static void wm8350_led_enable(struct wm8350_led *led)
+{
+        int ret;
+
+        if (led->enabled)
+                return;
+
+        ret = regulator_enable(led->isink);
+        if (ret != 0) {
+                dev_err(led->cdev.dev, "Failed to enable ISINK: %d\n", ret);
+                return;
+        }
+
+        ret = regulator_enable(led->dcdc);
+        if (ret != 0) {
+                dev_err(led->cdev.dev, "Failed to enable DCDC: %d\n", ret);
+                regulator_disable(led->isink);
+                return;
+        }
+
+        led->enabled = 1;
+}
+
+static void wm8350_led_disable(struct wm8350_led *led)
+{
+        int ret;
+
+        if (!led->enabled)
+                return;
+
+        ret = regulator_disable(led->dcdc);
+        if (ret != 0) {
+                dev_err(led->cdev.dev, "Failed to disable DCDC: %d\n", ret);
+                return;
+        }
+
+        ret = regulator_disable(led->isink);
+        if (ret != 0) {
+                dev_err(led->cdev.dev, "Failed to disable ISINK: %d\n", ret);
+                regulator_enable(led->dcdc);
+                return;
+        }
+
+        led->enabled = 0;
+}
+
+static void led_work(struct work_struct *work)
+{
+        struct wm8350_led *led = container_of(work, struct wm8350_led, work);
+        int ret;
+        int uA;
+        unsigned long flags;
+
+        mutex_lock(&led->mutex);
+
+        spin_lock_irqsave(&led->value_lock, flags);
+
+        if (led->value == LED_OFF) {
+                spin_unlock_irqrestore(&led->value_lock, flags);
+                wm8350_led_disable(led);
+                goto out;
+        }
+
+        /* This scales linearly into the index of valid current
+         * settings which results in a linear scaling of perceived
+         * brightness due to the non-linear current settings provided
+         * by the hardware.
+         */
+        uA = (led->max_uA_index * led->value) / LED_FULL;
+        spin_unlock_irqrestore(&led->value_lock, flags);
+        BUG_ON(uA >= ARRAY_SIZE(isink_cur));
+
+        ret = regulator_set_current_limit(led->isink, isink_cur[uA],
+                                          isink_cur[uA]);
+        if (ret != 0)
+                dev_err(led->cdev.dev, "Failed to set %duA: %d\n",
+                        isink_cur[uA], ret);
+
+        wm8350_led_enable(led);
+
+out:
+        mutex_unlock(&led->mutex);
+}
+
+static void wm8350_led_set(struct led_classdev *led_cdev,
+                           enum led_brightness value)
+{
+        struct wm8350_led *led = to_wm8350_led(led_cdev);
+        unsigned long flags;
+
+        spin_lock_irqsave(&led->value_lock, flags);
+        led->value = value;
+        schedule_work(&led->work);
+        spin_unlock_irqrestore(&led->value_lock, flags);
+}
+
+#ifdef CONFIG_PM
+static int wm8350_led_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct wm8350_led *led = platform_get_drvdata(pdev);
+
+        led_classdev_suspend(&led->cdev);
+        return 0;
+}
+
+static int wm8350_led_resume(struct platform_device *pdev)
+{
+        struct wm8350_led *led = platform_get_drvdata(pdev);
+
+        led_classdev_resume(&led->cdev);
+        return 0;
+}
+#else
+#define wm8350_led_suspend NULL
+#define wm8350_led_resume NULL
+#endif
+
+static void wm8350_led_shutdown(struct platform_device *pdev)
+{
+        struct wm8350_led *led = platform_get_drvdata(pdev);
+
+        mutex_lock(&led->mutex);
+        led->value = LED_OFF;
+        wm8350_led_disable(led);
+        mutex_unlock(&led->mutex);
+}
+
+static int wm8350_led_probe(struct platform_device *pdev)
+{
+        struct regulator *isink, *dcdc;
+        struct wm8350_led *led;
+        struct wm8350_led_platform_data *pdata = pdev->dev.platform_data;
+        int ret, i;
+
+        if (pdata == NULL) {
+                dev_err(&pdev->dev, "no platform data\n");
+                return -ENODEV;
+        }
+
+        if (pdata->max_uA < isink_cur[0]) {
+                dev_err(&pdev->dev, "Invalid maximum current %duA\n",
+                        pdata->max_uA);
+                return -EINVAL;
+        }
+
+        isink = regulator_get(&pdev->dev, "led_isink");
+        if (IS_ERR(isink)) {
+                printk(KERN_ERR "%s: cant get ISINK\n", __func__);
+                return PTR_ERR(isink);
+        }
+
+        dcdc = regulator_get(&pdev->dev, "led_vcc");
+        if (IS_ERR(dcdc)) {
+                printk(KERN_ERR "%s: cant get DCDC\n", __func__);
+                ret = PTR_ERR(dcdc);
+                goto err_isink;
+        }
+
+        led = kzalloc(sizeof(*led), GFP_KERNEL);
+        if (led == NULL) {
+                ret = -ENOMEM;
+                goto err_dcdc;
+        }
+
+        led->cdev.brightness_set = wm8350_led_set;
+        led->cdev.default_trigger = pdata->default_trigger;
+        led->cdev.name = pdata->name;
+        led->enabled = regulator_is_enabled(isink);
+        led->isink = isink;
+        led->dcdc = dcdc;
+
+        for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++)
+                if (isink_cur[i] >= pdata->max_uA)
+                        break;
+        led->max_uA_index = i;
+        if (pdata->max_uA != isink_cur[i])
+                dev_warn(&pdev->dev,
+                         "Maximum current %duA is not directly supported,"
+                         " check platform data\n",
+                         pdata->max_uA);
+
+        spin_lock_init(&led->value_lock);
+        mutex_init(&led->mutex);
+        INIT_WORK(&led->work, led_work);
+        led->value = LED_OFF;
+        platform_set_drvdata(pdev, led);
+
+        ret = led_classdev_register(&pdev->dev, &led->cdev);
+        if (ret < 0)
+                goto err_led;
+
+        return 0;
+
+ err_led:
+        kfree(led);
+ err_dcdc:
+        regulator_put(dcdc);
+ err_isink:
+        regulator_put(isink);
+        return ret;
+}
+
+static int wm8350_led_remove(struct platform_device *pdev)
+{
+        struct wm8350_led *led = platform_get_drvdata(pdev);
+
+        led_classdev_unregister(&led->cdev);
+        flush_scheduled_work();
+        wm8350_led_disable(led);
+        regulator_put(led->dcdc);
+        regulator_put(led->isink);
+        kfree(led);
+        return 0;
+}
+
+static struct platform_driver wm8350_led_driver = {
+        .driver = {
+                   .name = "wm8350-led",
+                   .owner = THIS_MODULE,
+                   },
+        .probe = wm8350_led_probe,
+        .remove = wm8350_led_remove,
+        .shutdown = wm8350_led_shutdown,
+        .suspend = wm8350_led_suspend,
+        .resume = wm8350_led_resume,
+};
+
+static int __devinit wm8350_led_init(void)
+{
+        return platform_driver_register(&wm8350_led_driver);
+}
+module_init(wm8350_led_init);
+
+static void wm8350_led_exit(void)
+{
+        platform_driver_unregister(&wm8350_led_driver);
+}
+module_exit(wm8350_led_exit);
+
+MODULE_AUTHOR("Mark Brown");
+MODULE_DESCRIPTION("WM8350 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8350-led");