Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / leds / leds-lp8788.c

diff --git a/kernel/drivers/leds/leds-lp8788.c b/kernel/drivers/leds/leds-lp8788.c
new file mode 100644 (file)
index 0000000..3409f03
--- /dev/null
+++ b/kernel/drivers/leds/leds-lp8788.c
@@ -0,0 +1,193 @@
+/*
+ * TI LP8788 MFD - keyled driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/mutex.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/mfd/lp8788-isink.h>
+
+#define MAX_BRIGHTNESS                 LP8788_ISINK_MAX_PWM
+#define DEFAULT_LED_NAME               "keyboard-backlight"
+
+struct lp8788_led {
+       struct lp8788 *lp;
+       struct mutex lock;
+       struct work_struct work;
+       struct led_classdev led_dev;
+       enum lp8788_isink_number isink_num;
+       enum led_brightness brightness;
+       int on;
+};
+
+struct lp8788_led_config {
+       enum lp8788_isink_scale scale;
+       enum lp8788_isink_number num;
+       int iout;
+};
+
+static struct lp8788_led_config default_led_config = {
+       .scale = LP8788_ISINK_SCALE_100mA,
+       .num   = LP8788_ISINK_3,
+       .iout  = 0,
+};
+
+static int lp8788_led_init_device(struct lp8788_led *led,
+                               struct lp8788_led_platform_data *pdata)
+{
+       struct lp8788_led_config *cfg = &default_led_config;
+       u8 addr, mask, val;
+       int ret;
+
+       if (pdata) {
+               cfg->scale = pdata->scale;
+               cfg->num = pdata->num;
+               cfg->iout = pdata->iout_code;
+       }
+
+       led->isink_num = cfg->num;
+
+       /* scale configuration */
+       addr = LP8788_ISINK_CTRL;
+       mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
+       val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
+       ret = lp8788_update_bits(led->lp, addr, mask, val);
+       if (ret)
+               return ret;
+
+       /* current configuration */
+       addr = lp8788_iout_addr[cfg->num];
+       mask = lp8788_iout_mask[cfg->num];
+       val = cfg->iout;
+
+       return lp8788_update_bits(led->lp, addr, mask, val);
+}
+
+static void lp8788_led_enable(struct lp8788_led *led,
+                       enum lp8788_isink_number num, int on)
+{
+       u8 mask = 1 << num;
+       u8 val = on << num;
+
+       if (lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val))
+               return;
+
+       led->on = on;
+}
+
+static void lp8788_led_work(struct work_struct *work)
+{
+       struct lp8788_led *led = container_of(work, struct lp8788_led, work);
+       enum lp8788_isink_number num = led->isink_num;
+       int enable;
+       u8 val = led->brightness;
+
+       mutex_lock(&led->lock);
+
+       switch (num) {
+       case LP8788_ISINK_1:
+       case LP8788_ISINK_2:
+       case LP8788_ISINK_3:
+               lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val);
+               break;
+       default:
+               mutex_unlock(&led->lock);
+               return;
+       }
+
+       enable = (val > 0) ? 1 : 0;
+       if (enable != led->on)
+               lp8788_led_enable(led, num, enable);
+
+       mutex_unlock(&led->lock);
+}
+
+static void lp8788_brightness_set(struct led_classdev *led_cdev,
+                               enum led_brightness brt_val)
+{
+       struct lp8788_led *led =
+                       container_of(led_cdev, struct lp8788_led, led_dev);
+
+       led->brightness = brt_val;
+       schedule_work(&led->work);
+}
+
+static int lp8788_led_probe(struct platform_device *pdev)
+{
+       struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
+       struct lp8788_led_platform_data *led_pdata;
+       struct lp8788_led *led;
+       struct device *dev = &pdev->dev;
+       int ret;
+
+       led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL);
+       if (!led)
+               return -ENOMEM;
+
+       led->lp = lp;
+       led->led_dev.max_brightness = MAX_BRIGHTNESS;
+       led->led_dev.brightness_set = lp8788_brightness_set;
+
+       led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
+
+       if (!led_pdata || !led_pdata->name)
+               led->led_dev.name = DEFAULT_LED_NAME;
+       else
+               led->led_dev.name = led_pdata->name;
+
+       mutex_init(&led->lock);
+       INIT_WORK(&led->work, lp8788_led_work);
+
+       platform_set_drvdata(pdev, led);
+
+       ret = lp8788_led_init_device(led, led_pdata);
+       if (ret) {
+               dev_err(dev, "led init device err: %d\n", ret);
+               return ret;
+       }
+
+       ret = led_classdev_register(dev, &led->led_dev);
+       if (ret) {
+               dev_err(dev, "led register err: %d\n", ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int lp8788_led_remove(struct platform_device *pdev)
+{
+       struct lp8788_led *led = platform_get_drvdata(pdev);
+
+       led_classdev_unregister(&led->led_dev);
+       flush_work(&led->work);
+
+       return 0;
+}
+
+static struct platform_driver lp8788_led_driver = {
+       .probe = lp8788_led_probe,
+       .remove = lp8788_led_remove,
+       .driver = {
+               .name = LP8788_DEV_KEYLED,
+       },
+};
+module_platform_driver(lp8788_led_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lp8788-keyled");