Date:	Sat, 31 May 2014 18:46:44 +0300
From:	Janne Kanniainen <janne.kanniainen@...il.com>
To:	cooloney@...il.com, rpurdie@...ys.net
Cc:	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Janne Kanniainen <janne.kanniainen@...il.com>
Subject: [PATCH] leds: USB: Add support for MSI GT683R led panels

This driver adds support for USB controlled led panels that exist in MSI GT683R laptop.

Signed-off-by: Janne Kanniainen <janne.kanniainen@...il.com>
---
 drivers/leds/Kconfig       |   6 ++
 drivers/leds/Makefile      |   1 +
 drivers/leds/leds-gt683r.c | 241 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 248 insertions(+)
 create mode 100644 drivers/leds/leds-gt683r.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 6de9dfb..2cffa0c 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -487,6 +487,12 @@ config LEDS_BLINKM
 	  This option enables support for the BlinkM RGB LED connected
 	  through I2C. Say Y to enable support for the BlinkM LED.
 
+config LEDS_GT683R
+       tristate "LED support for the MSI GT683R"
+       depends on LEDS_CLASS && USB
+       help
+         This option enables support for the MSI GT683R LEDS
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 3cd76db..af5fb4e 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o
 obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o
 obj-$(CONFIG_LEDS_LM355x)		+= leds-lm355x.o
 obj-$(CONFIG_LEDS_BLINKM)		+= leds-blinkm.o
+obj-$(CONFIG_LEDS_GT683R)		+= leds-gt683r.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o
diff --git a/drivers/leds/leds-gt683r.c b/drivers/leds/leds-gt683r.c
new file mode 100644
index 0000000..d67709c
--- /dev/null
+++ b/drivers/leds/leds-gt683r.c
@@ -0,0 +1,241 @@
+/*
+ * MSI GT683R led driver
+ *
+ * Copyright (c) 2014 Janne Kanniainen <janne.kanniainen@...il.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+
+#define USB_DEVICE_ID_MSI_GT683R_LED_PANEL 0xff00
+#define USB_VENDOR_ID_MSI 0x1770
+
+#define GT683R_LED_MSG_TYPE_CTRL 0
+#define GT683R_LED_MSG_TYPE_INT 1
+
+#define GT683R_LED_FRONT 4
+#define GT683R_LED_SIDE 2
+#define GT683R_LED_BACK 1
+#define GT683R_LED_NORMAL 5
+#define GT683R_LED_BREATHING 3
+#define GT683R_LED_AUDIO 2
+#define GT683R_LED_OFF 0
+
+struct gt683r_led {
+	struct usb_device *usb_dev;
+
+	struct usb_endpoint_descriptor *ctrl_out_ep;
+	int ctrl_out_buffer_size;
+	char *ctrl_out_buffer;
+	struct usb_ctrlrequest *ctrl_out_request;
+	struct urb *ctrl_out_urb;
+
+	struct led_classdev led_dev;
+	struct mutex lock;
+	struct work_struct work;
+
+	enum led_brightness brightness;
+};
+
+static const struct usb_device_id gt683r_led_id[] = {
+	{ USB_DEVICE(USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL) },
+	{ }
+};
+
+static char gt683r_led_select_leds[8] = {0x01, 0x02, 0x30, 0x00,
+					 0x00, 0x00, 0x00, 0x00};
+static char gt683r_led_select_type[8] = {0x01, 0x02, 0x20, 0x00,
+					 0x01, 0x00, 0x00, 0x00};
+
+static void gt683r_brightness_set(struct led_classdev *led_cdev,
+				  enum led_brightness brightness)
+{
+	struct gt683r_led *led =
+			container_of(led_cdev, struct gt683r_led, led_dev);
+
+	led->brightness = brightness;
+
+	schedule_work(&led->work);
+}
+
+static void gt683r_led_msg_snd_complete(struct urb *urb)
+{
+	usb_free_urb(urb);
+}
+
+static int gt683r_led_snd_msg(struct gt683r_led *led, char *msg)
+{
+	int result;
+
+	if (strlen(msg) > led->ctrl_out_buffer_size) {
+		dev_err(&led->usb_dev->dev, "Message to be send to device is too long\n");
+		return -EMSGSIZE;
+	}
+
+	led->ctrl_out_urb = usb_alloc_urb(0, GFP_KERNEL);
+	strcpy(led->ctrl_out_buffer, msg);
+	usb_fill_control_urb(led->ctrl_out_urb,
+			     led->usb_dev,
+			     usb_sndctrlpipe(led->usb_dev, led->ctrl_out_ep->bEndpointAddress),
+			     (unsigned char *) led->ctrl_out_request,
+			     led->ctrl_out_buffer,
+			     led->ctrl_out_buffer_size,
+			     gt683r_led_msg_snd_complete,
+			     led);
+
+	result = usb_submit_urb(led->ctrl_out_urb, GFP_KERNEL);
+
+	if (result) {
+		dev_err(&led->usb_dev->dev, "Failed to submit urb\n");
+		return -ECOMM;
+	}
+
+	return 0;
+}
+
+static void gt683r_led_set(struct gt683r_led *led, char leds, char type)
+{
+	gt683r_led_select_leds[3] = leds;
+	gt683r_led_select_type[3] = type;
+	gt683r_led_snd_msg(led, gt683r_led_select_leds);
+	gt683r_led_snd_msg(led, gt683r_led_select_type);
+}
+
+static void gt683r_led_work(struct work_struct *work)
+{
+	struct gt683r_led *led =
+			container_of(work, struct gt683r_led, work);
+
+	mutex_lock(&led->lock);
+
+	if (led->brightness)
+		gt683r_led_set(led, GT683R_LED_FRONT|GT683R_LED_SIDE|
+			       GT683R_LED_BACK, GT683R_LED_NORMAL);
+	else
+		gt683r_led_set(led, GT683R_LED_FRONT|GT683R_LED_SIDE|
+			       GT683R_LED_BACK, GT683R_LED_OFF);
+
+	mutex_unlock(&led->lock);
+}
+
+static struct led_classdev gt683r_led_dev = {
+	.name = "gt683r-led",
+	.brightness_set = gt683r_brightness_set,
+	.max_brightness = 1,
+	.flags = LED_CORE_SUSPENDRESUME,
+};
+
+static int gt683r_led_probe(struct usb_interface *intf,
+			    const struct usb_device_id *id)
+{
+	int ret = 0;
+	struct usb_endpoint_descriptor *endpoint;
+
+	struct gt683r_led *led = kzalloc(sizeof(struct gt683r_led), GFP_KERNEL);
+
+	if (!led) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	led->usb_dev = interface_to_usbdev(intf);
+	usb_set_intfdata(intf, led);
+	endpoint = &led->usb_dev->ep0.desc;
+
+	if (!led->ctrl_out_ep &&
+	    usb_endpoint_xfer_control(endpoint) &&
+	    usb_endpoint_dir_out(endpoint)) {
+		led->ctrl_out_ep = endpoint;
+		led->ctrl_out_buffer_size = endpoint->wMaxPacketSize;
+		led->ctrl_out_buffer = kmalloc(led->ctrl_out_buffer_size,
+					       GFP_KERNEL);
+		if (!led->ctrl_out_buffer) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+		led->ctrl_out_request = kmalloc(sizeof(struct usb_ctrlrequest),
+						     GFP_KERNEL);
+		if (!led->ctrl_out_request) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+		led->ctrl_out_request->bRequestType = 0x22;
+		led->ctrl_out_request->bRequest = 0x09;
+		led->ctrl_out_request->wValue = cpu_to_le16(0x0301);
+		led->ctrl_out_request->wIndex = cpu_to_le16(0x0000);
+		led->ctrl_out_request->wLength = cpu_to_le16(0x0008);
+	}
+
+	if (!led->ctrl_out_ep) {
+		dev_err(&led->usb_dev->dev, "Could not find ctrl-out endpoint\n");
+		ret = -EIO;
+		goto fail;
+	}
+
+	led->led_dev = gt683r_led_dev;
+	ret = led_classdev_register(&led->usb_dev->dev, &led->led_dev);
+	if (ret) {
+		dev_err(&led->usb_dev->dev, "Could not register led_classdev\n");
+		goto fail;
+	}
+
+	mutex_init(&led->lock);
+	INIT_WORK(&led->work, gt683r_led_work);
+
+	return 0;
+fail:
+	kfree(led->ctrl_out_buffer);
+	led->ctrl_out_buffer = NULL;
+
+	kfree(led->ctrl_out_request);
+	led->ctrl_out_request = NULL;
+
+	kfree(led);
+	led = NULL;
+
+	return ret;
+}
+
+static void gt683r_led_disconnect(struct usb_interface *intf)
+{
+	struct gt683r_led *led = usb_get_intfdata(intf);
+
+	led_classdev_unregister(&led->led_dev);
+	msleep(500);
+
+	kfree(led->ctrl_out_buffer);
+	led->ctrl_out_buffer = NULL;
+
+	kfree(led->ctrl_out_request);
+	led->ctrl_out_request = NULL;
+
+	kfree(led);
+	led = NULL;
+}
+
+static struct usb_driver gt683r_led_driver = {
+	.probe = gt683r_led_probe,
+	.disconnect = gt683r_led_disconnect,
+	.name = "GT683R Led Driver",
+	.id_table = gt683r_led_id,
+};
+
+module_usb_driver(gt683r_led_driver);
+
+MODULE_AUTHOR("Janne Kanniainen");
+MODULE_DESCRIPTION("MSI GT683R led driver");
+MODULE_LICENSE("GPL");
-- 
1.9.2

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