[PATCH v2] leds: USB: Add support for MSI GT683R led panels
From: Janne Kanniainen
Date: Thu Jun 05 2014 - 17:29:44 EST
This driver adds support for USB controlled led panels that exist in MSI GT683R laptop.
Changes in v2:
- sorted headers to alphabetic order
- using devm_kzalloc
- using BIT(n)
- using usb_control_msg instead of usb_submit_urb
- removing unneeded code
Signed-off-by: Janne Kanniainen <janne.kanniainen@xxxxxxxxx>
---
drivers/leds/Kconfig | 6 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-gt683r.c | 158 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 165 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..5a204ea
--- /dev/null
+++ b/drivers/leds/leds-gt683r.c
@@ -0,0 +1,158 @@
+/*
+ * MSI GT683R led driver
+ *
+ * Copyright (c) 2014 Janne Kanniainen <janne.kanniainen@xxxxxxxxx>
+ *
+ * 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/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#define USB_DEVICE_ID_MSI_GT683R_LED_PANEL 0xff00
+#define USB_VENDOR_ID_MSI 0x1770
+
+#define GT683R_LED_BACK BIT(0)
+#define GT683R_LED_SIDE BIT(1)
+#define GT683R_LED_FRONT BIT(2)
+#define GT683R_LED_ALL (GT683R_LED_BACK | GT683R_LED_SIDE | GT683R_LED_FRONT)
+
+#define GT683R_LED_OFF 0
+#define GT683R_LED_AUDIO 2
+#define GT683R_LED_BREATHING 3
+#define GT683R_LED_NORMAL 5
+
+struct gt683r_led {
+ struct usb_device *usb_dev;
+ struct usb_endpoint_descriptor *ep;
+ 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 const u64 gt683r_led_select_leds = 0x300201ULL;
+static const u64 gt683r_led_select_type = 0x100200201ULL;
+
+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);
+
+ mutex_lock(&led->lock);
+
+ led->brightness = brightness;
+
+ schedule_work(&led->work);
+}
+
+static int gt683r_led_snd_msg(struct gt683r_led *led, u64 msg)
+{
+ int result = usb_control_msg(led->usb_dev,
+ usb_sndctrlpipe(led->usb_dev,
+ led->ep->bEndpointAddress),
+ 0x09, 0x22, 0x0301, 0x0000,
+ &msg, sizeof(u64), USB_CTRL_SET_TIMEOUT);
+ if (result)
+ dev_err(&led->usb_dev->dev,
+ "Failed to send control message: %i\n", result);
+
+ return result;
+}
+
+static void gt683r_led_set(struct gt683r_led *led, char type)
+{
+ gt683r_led_snd_msg(led, gt683r_led_select_leds |
+ (GT683R_LED_ALL << 24));
+ gt683r_led_snd_msg(led, gt683r_led_select_type |
+ (type << 24));
+}
+
+static void gt683r_led_work(struct work_struct *work)
+{
+ struct gt683r_led *led =
+ container_of(work, struct gt683r_led, work);
+
+ if (led->brightness)
+ gt683r_led_set(led, GT683R_LED_NORMAL);
+ else
+ gt683r_led_set(led, 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 gt683r_led *led =
+ devm_kzalloc(&intf->dev, sizeof(struct gt683r_led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->usb_dev = interface_to_usbdev(intf);
+ usb_set_intfdata(intf, led);
+
+ led->ep = &led->usb_dev->ep0.desc;
+ if (!usb_endpoint_xfer_control(led->ep) ||
+ usb_endpoint_maxp(led->ep) != sizeof(u64))
+ return -EINVAL;
+
+ 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");
+ return ret;
+ }
+
+ mutex_init(&led->lock);
+ INIT_WORK(&led->work, gt683r_led_work);
+
+ return 0;
+}
+
+static void gt683r_led_disconnect(struct usb_interface *intf)
+{
+ struct gt683r_led *led = usb_get_intfdata(intf);
+
+ led_classdev_unregister(&led->led_dev);
+ cancel_work_sync(&led->work);
+}
+
+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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