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Linux/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");
144 

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