staging: nvec: add LED support

This patch adds support for LEDs connect to a nvec. A single brightness
property is exported to sysfs. LEDs are selected via bitfields in the
brightness value. Also the blinking behavior is selected through this
method. Vendors may use different values for different HW designs.

Signed-off-by: Ilya Petrov <ilya.muromec@gmail.com>
Signed-off-by: Marc Dietrich <marvin24@gmx.de>
[jak@jak-linux.org: Fixed checkpatch warnings]
Signed-off-by: Julian Andres Klode <jak@jak-linux.org>
Acked-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 127 insertions, 2 deletions

diff --git a/drivers/staging/nvec/Kconfig b/drivers/staging/nvec/Kconfig
index 987ad48ff93..a86cf27ae24 100644
--- a/drivers/staging/nvec/Kconfig
+++ b/drivers/staging/nvec/Kconfig
@@ -25,3 +25,9 @@ config NVEC_POWER
 	help
 	  Say Y to enable support for battery and charger interface for
 	  nVidia compliant embedded controllers.
+
+config NVEC_LEDS
+	bool "NVEC leds"
+	depends on MFD_NVEC && LEDS_CLASS
+	help
+	  Say Y to enable yellow side leds on AC100 or other nVidia tegra nvec leds
diff --git a/drivers/staging/nvec/Makefile b/drivers/staging/nvec/Makefile
index 4b5fcec1a10..b844d604e3a 100644
--- a/drivers/staging/nvec/Makefile
+++ b/drivers/staging/nvec/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_SERIO_NVEC_PS2)	+= nvec_ps2.o
 obj-$(CONFIG_MFD_NVEC)		+= nvec.o
 obj-$(CONFIG_NVEC_POWER) 	+= nvec_power.o
 obj-$(CONFIG_KEYBOARD_NVEC) 	+= nvec_kbd.o
+obj-$(CONFIG_NVEC_LEDS) 	+= nvec_leds.o
diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index 69130189798..43a83a953d4 100644
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -63,6 +63,10 @@ static struct mfd_cell nvec_devices[] = {
 		.name = "nvec-power",
 		.id = 2,
 	},
+	{
+		.name = "nvec-leds",
+		.id = 1,
+	},
 };
 
 int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb,
diff --git a/drivers/staging/nvec/nvec_kbd.c b/drivers/staging/nvec/nvec_kbd.c
index 06e877cf151..eaaafac6806 100644
--- a/drivers/staging/nvec/nvec_kbd.c
+++ b/drivers/staging/nvec/nvec_kbd.c
@@ -99,8 +99,8 @@ static int __devinit nvec_kbd_probe(struct platform_device *pdev)
 		keycodes[j++] = extcode_tab_us102[i];
 
 	idev = input_allocate_device();
-	idev->name = "Tegra nvec keyboard";
-	idev->phys = "i2c3_slave/nvec";
+	idev->name = "nvec keyboard";
+	idev->phys = "nvec";
 	idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_LED);
 	idev->ledbit[0] = BIT_MASK(LED_CAPSL);
 	idev->event = nvec_kbd_event;
diff --git a/drivers/staging/nvec/nvec_leds.c b/drivers/staging/nvec/nvec_leds.c
new file mode 100644
index 00000000000..f4cbcd62500
--- /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");