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 module_usb_driver(tv_driver);
141 
142 MODULE_AUTHOR(DRIVER_AUTHOR);
143 MODULE_DESCRIPTION(DRIVER_DESC);
144 MODULE_LICENSE("GPL");
145