1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * PlayStation 2 Trance Vibrator driver
4  *
5  * Copyright (C) 2006 Sam Hocevar <sam@zoy.org>
6  */
7 
8 /* Standard include files */
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/usb.h>
14 
15 #define DRIVER_AUTHOR "Sam Hocevar, sam@zoy.org"
16 #define DRIVER_DESC "PlayStation 2 Trance Vibrator driver"
17 
18 #define TRANCEVIBRATOR_VENDOR_ID	0x0b49	/* ASCII Corporation */
19 #define TRANCEVIBRATOR_PRODUCT_ID	0x064f	/* Trance Vibrator */
20 
21 static const struct usb_device_id id_table[] = {
22 	{ USB_DEVICE(TRANCEVIBRATOR_VENDOR_ID, TRANCEVIBRATOR_PRODUCT_ID) },
23 	{ },
24 };
25 MODULE_DEVICE_TABLE (usb, id_table);
26 
27 /* Driver-local specific stuff */
28 struct trancevibrator {
29 	struct usb_device *udev;
30 	unsigned int speed;
31 };
32 
33 static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
34 			  char *buf)
35 {
36 	struct usb_interface *intf = to_usb_interface(dev);
37 	struct trancevibrator *tv = usb_get_intfdata(intf);
38 
39 	return sprintf(buf, "%d\n", tv->speed);
40 }
41 
42 static ssize_t speed_store(struct device *dev, struct device_attribute *attr,
43 			 const char *buf, size_t count)
44 {
45 	struct usb_interface *intf = to_usb_interface(dev);
46 	struct trancevibrator *tv = usb_get_intfdata(intf);
47 	int temp, retval, old;
48 
49 	temp = simple_strtoul(buf, NULL, 10);
50 	if (temp > 255)
51 		temp = 255;
52 	else if (temp < 0)
53 		temp = 0;
54 	old = tv->speed;
55 	tv->speed = temp;
56 
57 	dev_dbg(&tv->udev->dev, "speed = %d\n", tv->speed);
58 
59 	/* Set speed */
60 	retval = usb_control_msg(tv->udev, usb_sndctrlpipe(tv->udev, 0),
61 				 0x01, /* vendor request: set speed */
62 				 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
63 				 tv->speed, /* speed value */
64 				 0, NULL, 0, USB_CTRL_GET_TIMEOUT);
65 	if (retval) {
66 		tv->speed = old;
67 		dev_dbg(&tv->udev->dev, "retval = %d\n", retval);
68 		return retval;
69 	}
70 	return count;
71 }
72 
73 static DEVICE_ATTR_RW(speed);
74 
75 static int tv_probe(struct usb_interface *interface,
76 		    const struct usb_device_id *id)
77 {
78 	struct usb_device *udev = interface_to_usbdev(interface);
79 	struct trancevibrator *dev;
80 	int retval;
81 
82 	dev = kzalloc(sizeof(struct trancevibrator), GFP_KERNEL);
83 	if (!dev) {
84 		retval = -ENOMEM;
85 		goto error;
86 	}
87 
88 	dev->udev = usb_get_dev(udev);
89 	usb_set_intfdata(interface, dev);
90 	retval = device_create_file(&interface->dev, &dev_attr_speed);
91 	if (retval)
92 		goto error_create_file;
93 
94 	return 0;
95 
96 error_create_file:
97 	usb_put_dev(udev);
98 	usb_set_intfdata(interface, NULL);
99 error:
100 	kfree(dev);
101 	return retval;
102 }
103 
104 static void tv_disconnect(struct usb_interface *interface)
105 {
106 	struct trancevibrator *dev;
107 
108 	dev = usb_get_intfdata (interface);
109 	device_remove_file(&interface->dev, &dev_attr_speed);
110 	usb_set_intfdata(interface, NULL);
111 	usb_put_dev(dev->udev);
112 	kfree(dev);
113 }
114 
115 /* USB subsystem object */
116 static struct usb_driver tv_driver = {
117 	.name =		"trancevibrator",
118 	.probe =	tv_probe,
119 	.disconnect =	tv_disconnect,
120 	.id_table =	id_table,
121 };
122 
123 module_usb_driver(tv_driver);
124 
125 MODULE_AUTHOR(DRIVER_AUTHOR);
126 MODULE_DESCRIPTION(DRIVER_DESC);
127 MODULE_LICENSE("GPL");
128