Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / nvec / nvec_paz00.c

diff --git a/kernel/drivers/staging/nvec/nvec_paz00.c b/kernel/drivers/staging/nvec/nvec_paz00.c
new file mode 100644 (file)
index 0000000..68146bf
--- /dev/null
+++ b/kernel/drivers/staging/nvec/nvec_paz00.c
@@ -0,0 +1,98 @@
+/*
+ * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
+ *
+ * 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 nvec_paz00_probe(struct platform_device *pdev)
+{
+       struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
+       struct nvec_led *led;
+       int ret = 0;
+
+       led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+       if (!led)
+               return -ENOMEM;
+
+       led->cdev.max_brightness = NVEC_LED_MAX;
+
+       led->cdev.brightness_set = nvec_led_brightness_set;
+       led->cdev.name = "paz00-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)
+               return ret;
+
+       /* to expose the default value to userspace */
+       led->cdev.brightness = 0;
+
+       return 0;
+}
+
+static int nvec_paz00_remove(struct platform_device *pdev)
+{
+       struct nvec_led *led = platform_get_drvdata(pdev);
+
+       led_classdev_unregister(&led->cdev);
+
+       return 0;
+}
+
+static struct platform_driver nvec_paz00_driver = {
+       .probe  = nvec_paz00_probe,
+       .remove = nvec_paz00_remove,
+       .driver = {
+               .name  = "nvec-paz00",
+       },
+};
+
+module_platform_driver(nvec_paz00_driver);
+
+MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
+MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nvec-paz00");