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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | /* * 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/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, struct device_attribute *attr, 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, struct device_attribute *attr, 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 = kzalloc(sizeof(struct usb_led), GFP_KERNEL); if (dev == NULL) { dev_err(&interface->dev, "Out of memory\n"); goto error_mem; } dev->udev = usb_get_dev(udev); usb_set_intfdata (interface, dev); retval = device_create_file(&interface->dev, &dev_attr_blue); if (retval) goto error; retval = device_create_file(&interface->dev, &dev_attr_red); if (retval) goto error; retval = device_create_file(&interface->dev, &dev_attr_green); if (retval) goto error; dev_info(&interface->dev, "USB LED device now attached\n"); return 0; error: 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_set_intfdata (interface, NULL); usb_put_dev(dev->udev); kfree(dev); error_mem: return retval; } static void led_disconnect(struct usb_interface *interface) { struct usb_led *dev; dev = usb_get_intfdata (interface); device_remove_file(&interface->dev, &dev_attr_blue); device_remove_file(&interface->dev, &dev_attr_red); device_remove_file(&interface->dev, &dev_attr_green); /* first remove the files, then set the pointer to NULL */ usb_set_intfdata (interface, NULL); usb_put_dev(dev->udev); kfree(dev); dev_info(&interface->dev, "USB LED now disconnected\n"); } static struct usb_driver led_driver = { .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"); |