drivers/usb/misc/trancevibrator.c

   1 /*
   2  * PlayStation 2 Trance Vibrator driver
   3  *
   4  * Copyright (C) 2006 Sam Hocevar <sam@zoy.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 /* Standard include files */
  22 #include <linux/kernel.h>
  23 #include <linux/errno.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/module.h>
  27 #include <linux/usb.h>
  28
  29 /* Version Information */
  30 #define DRIVER_VERSION "v1.1"
  31 #define DRIVER_AUTHOR "Sam Hocevar, sam@zoy.org"
  32 #define DRIVER_DESC "PlayStation 2 Trance Vibrator driver"
  33
  34 #define TRANCEVIBRATOR_VENDOR_ID        0x0b49  /* ASCII Corporation */
  35 #define TRANCEVIBRATOR_PRODUCT_ID       0x064f  /* Trance Vibrator */
  36
  37 static const struct usb_device_id id_table[] = {
  38         { USB_DEVICE(TRANCEVIBRATOR_VENDOR_ID, TRANCEVIBRATOR_PRODUCT_ID) },
  39         { },
  40 };
  41 MODULE_DEVICE_TABLE (usb, id_table);
  42
  43 /* Driver-local specific stuff */
  44 struct trancevibrator {
  45         struct usb_device *udev;
  46         unsigned int speed;
  47 };
  48
  49 static ssize_t show_speed(struct device *dev, struct device_attribute *attr,
  50                           char *buf)
  51 {
  52         struct usb_interface *intf = to_usb_interface(dev);
  53         struct trancevibrator *tv = usb_get_intfdata(intf);
  54
  55         return sprintf(buf, "%d\n", tv->speed);
  56 }
  57
  58 static ssize_t set_speed(struct device *dev, struct device_attribute *attr,
  59                          const char *buf, size_t count)
  60 {
  61         struct usb_interface *intf = to_usb_interface(dev);
  62         struct trancevibrator *tv = usb_get_intfdata(intf);
  63         int temp, retval, old;
  64
  65         temp = simple_strtoul(buf, NULL, 10);
  66         if (temp > 255)
  67                 temp = 255;
  68         else if (temp < 0)
  69                 temp = 0;
  70         old = tv->speed;
  71         tv->speed = temp;
  72
  73         dev_dbg(&tv->udev->dev, "speed = %d\n", tv->speed);
  74
  75         /* Set speed */
  76         retval = usb_control_msg(tv->udev, usb_sndctrlpipe(tv->udev, 0),
  77                                  0x01, /* vendor request: set speed */
  78                                  USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
  79                                  tv->speed, /* speed value */
  80                                  0, NULL, 0, USB_CTRL_GET_TIMEOUT);
  81         if (retval) {
  82                 tv->speed = old;
  83                 dev_dbg(&tv->udev->dev, "retval = %d\n", retval);
  84                 return retval;
  85         }
  86         return count;
  87 }
  88
  89 static DEVICE_ATTR(speed, S_IRUGO | S_IWUSR, show_speed, set_speed);
  90
  91 static int tv_probe(struct usb_interface *interface,
  92                     const struct usb_device_id *id)
  93 {
  94         struct usb_device *udev = interface_to_usbdev(interface);
  95         struct trancevibrator *dev;
  96         int retval;
  97
  98         dev = kzalloc(sizeof(struct trancevibrator), GFP_KERNEL);
  99         if (dev == NULL) {
 100                 dev_err(&interface->dev, "Out of memory\n");
 101                 retval = -ENOMEM;
 102                 goto error;
 103         }
 104
 105         dev->udev = usb_get_dev(udev);
 106         usb_set_intfdata(interface, dev);
 107         retval = device_create_file(&interface->dev, &dev_attr_speed);
 108         if (retval)
 109                 goto error_create_file;
 110
 111         return 0;
 112
 113 error_create_file:
 114         usb_put_dev(udev);
 115         usb_set_intfdata(interface, NULL);
 116 error:
 117         kfree(dev);
 118         return retval;
 119 }
 120
 121 static void tv_disconnect(struct usb_interface *interface)
 122 {
 123         struct trancevibrator *dev;
 124
 125         dev = usb_get_intfdata (interface);
 126         device_remove_file(&interface->dev, &dev_attr_speed);
 127         usb_set_intfdata(interface, NULL);
 128         usb_put_dev(dev->udev);
 129         kfree(dev);
 130 }
 131
 132 /* USB subsystem object */
 133 static struct usb_driver tv_driver = {
 134         .name =         "trancevibrator",
 135         .probe =        tv_probe,
 136         .disconnect =   tv_disconnect,
 137         .id_table =     id_table,
 138 };
 139
 140 static int __init tv_init(void)
 141 {
 142         int retval = usb_register(&tv_driver);
 143         if (retval) {
 144                 err("usb_register failed. Error number %d", retval);
 145                 return retval;
 146         }
 147
 148         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 149                DRIVER_DESC "\n");
 150         return 0;
 151 }
 152
 153 static void __exit tv_exit(void)
 154 {
 155         usb_deregister(&tv_driver);
 156 }
 157
 158 module_init (tv_init);
 159 module_exit (tv_exit);
 160
 161 MODULE_AUTHOR(DRIVER_AUTHOR);
 162 MODULE_DESCRIPTION(DRIVER_DESC);
 163 MODULE_LICENSE("GPL");