diff options
Diffstat (limited to 'drivers/usb/misc/usbled.c')
| -rw-r--r-- | drivers/usb/misc/usbled.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/usb/misc/usbled.c b/drivers/usb/misc/usbled.c new file mode 100644 index 000000000000..ee329d5e1c5e --- /dev/null +++ b/drivers/usb/misc/usbled.c @@ -0,0 +1,181 @@ +/* + * USB LED driver - 1.1 + * + * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.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, version 2. + * + */ + +#include <linux/config.h> +#ifdef CONFIG_USB_DEBUG + #define DEBUG 1 +#endif +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/usb.h> + + +#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com" +#define DRIVER_DESC "USB LED Driver" + +#define VENDOR_ID 0x0fc5 +#define PRODUCT_ID 0x1223 + +/* table of devices that work with this driver */ +static struct usb_device_id id_table [] = { + { USB_DEVICE(VENDOR_ID, PRODUCT_ID) }, + { }, +}; +MODULE_DEVICE_TABLE (usb, id_table); + +struct usb_led { + struct usb_device * udev; + unsigned char blue; + unsigned char red; + unsigned char green; +}; + +#define BLUE 0x04 +#define RED 0x02 +#define GREEN 0x01 +static void change_color(struct usb_led *led) +{ + int retval; + unsigned char color = 0x07; + unsigned char *buffer; + + buffer = kmalloc(8, GFP_KERNEL); + if (!buffer) { + dev_err(&led->udev->dev, "out of memory\n"); + return; + } + + if (led->blue) + color &= ~(BLUE); + if (led->red) + color &= ~(RED); + if (led->green) + color &= ~(GREEN); + dev_dbg(&led->udev->dev, + "blue = %d, red = %d, green = %d, color = %.2x\n", + led->blue, led->red, led->green, color); + + retval = usb_control_msg(led->udev, + usb_sndctrlpipe(led->udev, 0), + 0x12, + 0xc8, + (0x02 * 0x100) + 0x0a, + (0x00 * 0x100) + color, + buffer, + 8, + 2000); + if (retval) + dev_dbg(&led->udev->dev, "retval = %d\n", retval); + kfree(buffer); +} + +#define show_set(value) \ +static ssize_t show_##value(struct device *dev, char *buf) \ +{ \ + struct usb_interface *intf = to_usb_interface(dev); \ + struct usb_led *led = usb_get_intfdata(intf); \ + \ + return sprintf(buf, "%d\n", led->value); \ +} \ +static ssize_t set_##value(struct device *dev, const char *buf, size_t count) \ +{ \ + struct usb_interface *intf = to_usb_interface(dev); \ + struct usb_led *led = usb_get_intfdata(intf); \ + int temp = simple_strtoul(buf, NULL, 10); \ + \ + led->value = temp; \ + change_color(led); \ + return count; \ +} \ +static DEVICE_ATTR(value, S_IWUGO | S_IRUGO, show_##value, set_##value); +show_set(blue); +show_set(red); +show_set(green); + +static int led_probe(struct usb_interface *interface, const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(interface); + struct usb_led *dev = NULL; + int retval = -ENOMEM; + + dev = kmalloc(sizeof(struct usb_led), GFP_KERNEL); + if (dev == NULL) { + dev_err(&interface->dev, "Out of memory\n"); + goto error; + } + memset (dev, 0x00, sizeof (*dev)); + + dev->udev = usb_get_dev(udev); + + usb_set_intfdata (interface, dev); + + device_create_file(&interface->dev, &dev_attr_blue); + device_create_file(&interface->dev, &dev_attr_red); + device_create_file(&interface->dev, &dev_attr_green); + + dev_info(&interface->dev, "USB LED device now attached\n"); + return 0; + +error: + kfree(dev); + return retval; +} + +static void led_disconnect(struct usb_interface *interface) +{ + struct usb_led *dev; + + dev = usb_get_intfdata (interface); + usb_set_intfdata (interface, NULL); + + device_remove_file(&interface->dev, &dev_attr_blue); + device_remove_file(&interface->dev, &dev_attr_red); + device_remove_file(&interface->dev, &dev_attr_green); + + usb_put_dev(dev->udev); + + kfree(dev); + + dev_info(&interface->dev, "USB LED now disconnected\n"); +} + +static struct usb_driver led_driver = { + .owner = THIS_MODULE, + .name = "usbled", + .probe = led_probe, + .disconnect = led_disconnect, + .id_table = id_table, +}; + +static int __init usb_led_init(void) +{ + int retval = 0; + + retval = usb_register(&led_driver); + if (retval) + err("usb_register failed. Error number %d", retval); + return retval; +} + +static void __exit usb_led_exit(void) +{ + usb_deregister(&led_driver); +} + +module_init (usb_led_init); +module_exit (usb_led_exit); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); |