1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/staging/nvec/nvec_leds.c b/drivers/staging/nvec/nvec_leds.c
new file mode 100644
index 0000000..f4cbcd6
--- /dev/null
+++ b/drivers/staging/nvec/nvec_leds.c
@@ -0,0 +1,114 @@
+/*
+ * nvec_leds: LED driver for a NVIDIA compliant embedded controller
+ *
+ * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
+ *
+ * Authors:  Ilya Petrov <ilya.muromec@gmail.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+#include "nvec.h"
+
+#define to_nvec_led(led_cdev) \
+	container_of(led_cdev, struct nvec_led, cdev)
+
+#define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}
+
+#define NVEC_LED_MAX 8
+
+struct nvec_led {
+	struct led_classdev cdev;
+	struct nvec_chip *nvec;
+};
+
+static void nvec_led_brightness_set(struct led_classdev *led_cdev,
+				    enum led_brightness value)
+{
+	struct nvec_led *led = to_nvec_led(led_cdev);
+	unsigned char buf[] = NVEC_LED_REQ;
+	buf[4] = value;
+
+	nvec_write_async(led->nvec, buf, sizeof(buf));
+
+	led->cdev.brightness = value;
+
+}
+
+static int __devinit nvec_led_probe(struct platform_device *pdev)
+{
+	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
+	struct nvec_led *led;
+	int ret = 0;
+
+	led = kzalloc(sizeof(*led), GFP_KERNEL);
+	if (led == NULL)
+		return -ENOMEM;
+
+	led->cdev.max_brightness = NVEC_LED_MAX;
+
+	led->cdev.brightness_set = nvec_led_brightness_set;
+	led->cdev.name = "nvec-led";
+	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	led->nvec = nvec;
+
+	platform_set_drvdata(pdev, led);
+
+	ret = led_classdev_register(&pdev->dev, &led->cdev);
+	if (ret < 0)
+		goto err_led;
+
+	/* to expose the default value to userspace */
+	led->cdev.brightness = 0;
+
+	return 0;
+
+err_led:
+	kfree(led);
+	return ret;
+}
+
+static int __devexit nvec_led_remove(struct platform_device *pdev)
+{
+	struct nvec_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->cdev);
+	kfree(led);
+	return 0;
+}
+
+static struct platform_driver nvec_led_driver = {
+	.probe  = nvec_led_probe,
+	.remove = __devexit_p(nvec_led_remove),
+	.driver = {
+		   .name  = "nvec-leds",
+		   .owner = THIS_MODULE,
+	},
+};
+
+static int __init nvec_led_init(void)
+{
+	return platform_driver_register(&nvec_led_driver);
+}
+
+module_init(nvec_led_init);
+
+static void __exit nvec_led_exit(void)
+{
+	platform_driver_unregister(&nvec_led_driver);
+}
+
+module_exit(nvec_led_exit);
+
+MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
+MODULE_DESCRIPTION("Tegra NVEC LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nvec-leds");