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/slab.h>
  25 #include <linux/module.h>
  26 #include <linux/usb.h>
  27
  28 /* Version Information */
  29 #define DRIVER_VERSION "v1.1"
  30 #define DRIVER_AUTHOR "Sam Hocevar, sam@zoy.org"
  31 #define DRIVER_DESC "PlayStation 2 Trance Vibrator driver"
  32
  33 #define TRANCEVIBRATOR_VENDOR_ID        0x0b49  /* ASCII Corporation */
  34 #define TRANCEVIBRATOR_PRODUCT_ID       0x064f  /* Trance Vibrator */
  35
  36 static const struct usb_device_id id_table[] = {
  37         { USB_DEVICE(TRANCEVIBRATOR_VENDOR_ID, TRANCEVIBRATOR_PRODUCT_ID) },
  38         { },
  39 };
  40 MODULE_DEVICE_TABLE (usb, id_table);
  41
  42 /* Driver-local specific stuff */
  43 struct trancevibrator {
  44         struct usb_device *udev;
  45         unsigned int speed;
  46 };
  47
  48 static ssize_t show_speed(struct device *dev, struct device_attribute *attr,
  49                           char *buf)
  50 {
  51         struct usb_interface *intf = to_usb_interface(dev);
  52         struct trancevibrator *tv = usb_get_intfdata(intf);
  53
  54         return sprintf(buf, "%d\n", tv->speed);
  55 }
  56
  57 static ssize_t set_speed(struct device *dev, struct device_attribute *attr,
  58                          const char *buf, size_t count)
  59 {
  60         struct usb_interface *intf = to_usb_interface(dev);
  61         struct trancevibrator *tv = usb_get_intfdata(intf);
  62         int temp, retval, old;
  63
  64         temp = simple_strtoul(buf, NULL, 10);
  65         if (temp > 255)
  66                 temp = 255;
  67         else if (temp < 0)
  68                 temp = 0;
  69         old = tv->speed;
  70         tv->speed = temp;
  71
  72         dev_dbg(&tv->udev->dev, "speed = %d\n", tv->speed);
  73
  74         /* Set speed */
  75         retval = usb_control_msg(tv->udev, usb_sndctrlpipe(tv->udev, 0),
  76                                  0x01, /* vendor request: set speed */
  77                                  USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
  78                                  tv->speed, /* speed value */
  79                                  0, NULL, 0, USB_CTRL_GET_TIMEOUT);
  80         if (retval) {
  81                 tv->speed = old;
  82                 dev_dbg(&tv->udev->dev, "retval = %d\n", retval);
  83                 return retval;
  84         }
  85         return count;
  86 }
  87
  88 static DEVICE_ATTR(speed, S_IRUGO | S_IWUSR, show_speed, set_speed);
  89
  90 static int tv_probe(struct usb_interface *interface,
  91                     const struct usb_device_id *id)
  92 {
  93         struct usb_device *udev = interface_to_usbdev(interface);
  94         struct trancevibrator *dev;
  95         int retval;
  96
  97         dev = kzalloc(sizeof(struct trancevibrator), GFP_KERNEL);
  98         if (dev == NULL) {
  99                 dev_err(&interface->dev, "Out of memory\n");
 100                 retval = -ENOMEM;
 101                 goto error;
 102         }
 103
 104         dev->udev = usb_get_dev(udev);
 105         usb_set_intfdata(interface, dev);
 106         retval = device_create_file(&interface->dev, &dev_attr_speed);
 107         if (retval)
 108                 goto error_create_file;
 109
 110         return 0;
 111
 112 error_create_file:
 113         usb_put_dev(udev);
 114         usb_set_intfdata(interface, NULL);
 115 error:
 116         kfree(dev);
 117         return retval;
 118 }
 119
 120 static void tv_disconnect(struct usb_interface *interface)
 121 {
 122         struct trancevibrator *dev;
 123
 124         dev = usb_get_intfdata (interface);
 125         device_remove_file(&interface->dev, &dev_attr_speed);
 126         usb_set_intfdata(interface, NULL);
 127         usb_put_dev(dev->udev);
 128         kfree(dev);
 129 }
 130
 131 /* USB subsystem object */
 132 static struct usb_driver tv_driver = {
 133         .name =         "trancevibrator",
 134         .probe =        tv_probe,
 135         .disconnect =   tv_disconnect,
 136         .id_table =     id_table,
 137 };
 138
 139 module_usb_driver(tv_driver);
 140
 141 MODULE_AUTHOR(DRIVER_AUTHOR);
 142 MODULE_DESCRIPTION(DRIVER_DESC);
 143 MODULE_LICENSE("GPL");