[deliverable/linux.git] / drivers / usb / media / dsbr100.c

/* A driver for the D-Link DSB-R100 USB radio.  The R100 plugs
 into both the USB and an analog audio input, so this thing
 only deals with initialisation and frequency setting, the
 audio data has to be handled by a sound driver.

 Major issue: I can't find out where the device reports the signal
 strength, and indeed the windows software appearantly just looks
 at the stereo indicator as well.  So, scanning will only find
 stereo stations.  Sad, but I can't help it.

 Also, the windows program sends oodles of messages over to the
 device, and I couldn't figure out their meaning.  My suspicion
 is that they don't have any:-)

 You might find some interesting stuff about this module at
 http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr

 Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 History:

 Version 0.40:
  Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing

 Version 0.30:
 	Markus: Updates for 2.5.x kernel and more ISO compliant source

 Version 0.25:
        PSL and Markus: Cleanup, radio now doesn't stop on device close

 Version 0.24:
 	Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
	right.  Some minor cleanup, improved standalone compilation

 Version 0.23:
 	Markus: Sign extension bug fixed by declaring transfer_buffer unsigned

 Version 0.22:
 	Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns, 
	thanks to Mike Cox for pointing the problem out.

 Version 0.21:
 	Markus: Minor cleanup, warnings if something goes wrong, lame attempt
	to adhere to Documentation/CodingStyle

 Version 0.2: 
 	Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
	Markus: Copyright clarification

 Version 0.01: Markus: initial release

*/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/videodev.h>
#include <linux/usb.h>
#include <linux/smp_lock.h>

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.40"
#define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
#define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"

#define DSB100_VENDOR 0x04b4
#define DSB100_PRODUCT 0x1002

/* Commands the device appears to understand */
#define DSB100_TUNE 1
#define DSB100_ONOFF 2

#define TB_LEN 16

/* Frequency limits in MHz -- these are European values.  For Japanese
devices, that would be 76 and 91.  */
#define FREQ_MIN  87.5
#define FREQ_MAX 108.0
#define FREQ_MUL 16000


static int usb_dsbr100_probe(struct usb_interface *intf,
			     const struct usb_device_id *id);
static void usb_dsbr100_disconnect(struct usb_interface *intf);
static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
			     unsigned int cmd, unsigned long arg);
static int usb_dsbr100_open(struct inode *inode, struct file *file);
static int usb_dsbr100_close(struct inode *inode, struct file *file);

static int radio_nr = -1;
module_param(radio_nr, int, 0);

/* Data for one (physical) device */
typedef struct {
	struct usb_device *usbdev;
	struct video_device *videodev;
	unsigned char transfer_buffer[TB_LEN];
	int curfreq;
	int stereo;
	int users;
	int removed;
} dsbr100_device;


/* File system interface */
static struct file_operations usb_dsbr100_fops = {
	.owner =	THIS_MODULE,
	.open =		usb_dsbr100_open,
	.release =     	usb_dsbr100_close,
	.ioctl =        usb_dsbr100_ioctl,
	.llseek =       no_llseek,
};

/* V4L interface */
static struct video_device dsbr100_videodev_template=
{
	.owner =	THIS_MODULE,
	.name =		"D-Link DSB-R 100",
	.type =		VID_TYPE_TUNER,
	.hardware =	VID_HARDWARE_AZTECH,
	.fops =         &usb_dsbr100_fops,
	.release = video_device_release,
};

static struct usb_device_id usb_dsbr100_device_table [] = {
	{ USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);

/* USB subsystem interface */
static struct usb_driver usb_dsbr100_driver = {
	.name =		"dsbr100",
	.probe =	usb_dsbr100_probe,
	.disconnect =	usb_dsbr100_disconnect,
	.id_table =	usb_dsbr100_device_table,
};

/* Low-level device interface begins here */

/* switch on radio */
static int dsbr100_start(dsbr100_device *radio)
{
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			DSB100_ONOFF, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
		return -1;
	return (radio->transfer_buffer)[0];
}


/* switch off radio */
static int dsbr100_stop(dsbr100_device *radio)
{
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			DSB100_ONOFF, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
		return -1;
	return (radio->transfer_buffer)[0];
}

/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
static int dsbr100_setfreq(dsbr100_device *radio, int freq)
{
	freq = (freq/16*80)/1000+856;
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			DSB100_TUNE, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			(freq>>8)&0x00ff, freq&0xff, 
			radio->transfer_buffer, 8, 300)<0 ||
	   usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
		 	USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
			0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
		radio->stereo = -1;
		return -1;
	}
	radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
	return (radio->transfer_buffer)[0];
}

/* return the device status.  This is, in effect, just whether it
sees a stereo signal or not.  Pity. */
static void dsbr100_getstat(dsbr100_device *radio)
{
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
		USB_REQ_GET_STATUS, 
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
		radio->stereo = -1;
	else
		radio->stereo = ! (radio->transfer_buffer[0]&0x01);
}


/* USB subsystem interface begins here */

/* check if the device is present and register with v4l and
usb if it is */
static int usb_dsbr100_probe(struct usb_interface *intf, 
			 const struct usb_device_id *id)
{
	dsbr100_device *radio;

	if (!(radio = kmalloc(sizeof(dsbr100_device), GFP_KERNEL)))
		return -ENOMEM;
	if (!(radio->videodev = video_device_alloc())) {
		kfree(radio);
		return -ENOMEM;
	}
	memcpy(radio->videodev, &dsbr100_videodev_template, 
		sizeof(dsbr100_videodev_template));
	radio->removed = 0;
	radio->users = 0;
	radio->usbdev = interface_to_usbdev(intf);
	radio->curfreq = FREQ_MIN*FREQ_MUL;
	video_set_drvdata(radio->videodev, radio);
	if (video_register_device(radio->videodev, VFL_TYPE_RADIO,
		radio_nr)) {
		warn("Could not register video device");
		video_device_release(radio->videodev);
		kfree(radio);
		return -EIO;
	}
	usb_set_intfdata(intf, radio);
	return 0;
}

/* handle unplugging of the device, release data structures
if nothing keeps us from doing it.  If something is still
keeping us busy, the release callback of v4l will take care
of releasing it.  stv680.c does not relase its private
data, so I don't do this here either.  Checking out the
code I'd expect I better did that, but if there's a memory
leak here it's tiny (~50 bytes per disconnect) */
static void usb_dsbr100_disconnect(struct usb_interface *intf)
{
	dsbr100_device *radio = usb_get_intfdata(intf);

	usb_set_intfdata (intf, NULL);
	if (radio) {
		video_unregister_device(radio->videodev);
		radio->videodev = NULL;
		if (radio->users) {
			kfree(radio);
		} else {
			radio->removed = 1;
		}
	}
}


/* Video for Linux interface */

static int usb_dsbr100_do_ioctl(struct inode *inode, struct file *file,
				unsigned int cmd, void *arg)
{
	dsbr100_device *radio=video_get_drvdata(video_devdata(file));

	if (!radio)
		return -EIO;

	switch(cmd) {
		case VIDIOCGCAP: {
			struct video_capability *v = arg;

			memset(v, 0, sizeof(*v));
			v->type = VID_TYPE_TUNER;
			v->channels = 1;
			v->audios = 1;
			strcpy(v->name, "D-Link R-100 USB FM Radio");
			return 0;
		}
		case VIDIOCGTUNER: {
			struct video_tuner *v = arg;

			dsbr100_getstat(radio);
			if(v->tuner)	/* Only 1 tuner */ 
				return -EINVAL;
			v->rangelow = FREQ_MIN*FREQ_MUL;
			v->rangehigh = FREQ_MAX*FREQ_MUL;
			v->flags = VIDEO_TUNER_LOW;
			v->mode = VIDEO_MODE_AUTO;
			v->signal = radio->stereo*0x7000;
				/* Don't know how to get signal strength */
			v->flags |= VIDEO_TUNER_STEREO_ON*radio->stereo;
			strcpy(v->name, "DSB R-100");
			return 0;
		}
		case VIDIOCSTUNER: {
			struct video_tuner *v = arg;

			if(v->tuner!=0)
				return -EINVAL;
			/* Only 1 tuner so no setting needed ! */
			return 0;
		}
		case VIDIOCGFREQ: {
			int *freq = arg;

			if (radio->curfreq==-1)
				return -EINVAL;
			*freq = radio->curfreq;
			return 0;
		}
		case VIDIOCSFREQ: {
			int *freq = arg;

			radio->curfreq = *freq;
			if (dsbr100_setfreq(radio, radio->curfreq)==-1)
				warn("Set frequency failed");
			return 0;
		}
		case VIDIOCGAUDIO: {
			struct video_audio *v = arg;

			memset(v, 0, sizeof(*v));
			v->flags |= VIDEO_AUDIO_MUTABLE;
			v->mode = VIDEO_SOUND_STEREO;
			v->volume = 1;
			v->step = 1;
			strcpy(v->name, "Radio");
			return 0;			
		}
		case VIDIOCSAUDIO: {
			struct video_audio *v = arg;

			if (v->audio) 
				return -EINVAL;
			if (v->flags&VIDEO_AUDIO_MUTE) {
				if (dsbr100_stop(radio)==-1)
					warn("Radio did not respond properly");
			}
			else
				if (dsbr100_start(radio)==-1)
					warn("Radio did not respond properly");
			return 0;
		}
		default:
			return -ENOIOCTLCMD;
	}
}

static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
			     unsigned int cmd, unsigned long arg)
{
	return video_usercopy(inode, file, cmd, arg, usb_dsbr100_do_ioctl);
}

static int usb_dsbr100_open(struct inode *inode, struct file *file)
{
	dsbr100_device *radio=video_get_drvdata(video_devdata(file));

	radio->users = 1;
	if (dsbr100_start(radio)<0) {
		warn("Radio did not start up properly");
		radio->users = 0;
		return -EIO;
	}
	dsbr100_setfreq(radio, radio->curfreq);
	return 0;
}

static int usb_dsbr100_close(struct inode *inode, struct file *file)
{
	dsbr100_device *radio=video_get_drvdata(video_devdata(file));

	if (!radio)
		return -ENODEV;
	radio->users = 0;
	if (radio->removed) {
		kfree(radio);
	}
	return 0;
}

static int __init dsbr100_init(void)
{
	int retval = usb_register(&usb_dsbr100_driver);
	info(DRIVER_VERSION ":" DRIVER_DESC);
	return retval;
}

static void __exit dsbr100_exit(void)
{
	usb_deregister(&usb_dsbr100_driver);
}

module_init (dsbr100_init);
module_exit (dsbr100_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/* A driver for the D-Link DSB-R100 USB radio. The R100 plugs
	2	into both the USB and an analog audio input, so this thing
	3	only deals with initialisation and frequency setting, the
	4	audio data has to be handled by a sound driver.
	5
	6	Major issue: I can't find out where the device reports the signal
	7	strength, and indeed the windows software appearantly just looks
	8	at the stereo indicator as well. So, scanning will only find
	9	stereo stations. Sad, but I can't help it.
	10
	11	Also, the windows program sends oodles of messages over to the
	12	device, and I couldn't figure out their meaning. My suspicion
	13	is that they don't have any:-)
	14
	15	You might find some interesting stuff about this module at
	16	http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr
	17
	18	Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
	19
	20	This program is free software; you can redistribute it and/or modify
	21	it under the terms of the GNU General Public License as published by
	22	the Free Software Foundation; either version 2 of the License, or
	23	(at your option) any later version.
	24
	25	This program is distributed in the hope that it will be useful,
	26	but WITHOUT ANY WARRANTY; without even the implied warranty of
	27	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	28	GNU General Public License for more details.
	29
	30	You should have received a copy of the GNU General Public License
	31	along with this program; if not, write to the Free Software
	32	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	33
	34	History:
	35
	36	Version 0.40:
	37	Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
	38
	39	Version 0.30:
	40	Markus: Updates for 2.5.x kernel and more ISO compliant source
	41
	42	Version 0.25:
	43	PSL and Markus: Cleanup, radio now doesn't stop on device close
	44
	45	Version 0.24:
	46	Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
	47	right. Some minor cleanup, improved standalone compilation
	48
	49	Version 0.23:
	50	Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
	51
	52	Version 0.22:
	53	Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
	54	thanks to Mike Cox for pointing the problem out.
	55
	56	Version 0.21:
	57	Markus: Minor cleanup, warnings if something goes wrong, lame attempt
	58	to adhere to Documentation/CodingStyle
	59
	60	Version 0.2:
	61	Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
	62	Markus: Copyright clarification
	63
	64	Version 0.01: Markus: initial release
65
66	*/
67
68
69	#include <linux/kernel.h>
70	#include <linux/module.h>
71	#include <linux/init.h>
72	#include <linux/slab.h>
73	#include <linux/input.h>
74	#include <linux/videodev.h>
75	#include <linux/usb.h>
76	#include <linux/smp_lock.h>
77
78	/*
79	* Version Information
80	*/
81	#define DRIVER_VERSION "v0.40"
82	#define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
83	#define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
84
85	#define DSB100_VENDOR 0x04b4
86	#define DSB100_PRODUCT 0x1002
87
88	/* Commands the device appears to understand */
89	#define DSB100_TUNE 1
90	#define DSB100_ONOFF 2
91
92	#define TB_LEN 16
93
94	/* Frequency limits in MHz -- these are European values. For Japanese
95	devices, that would be 76 and 91. */
96	#define FREQ_MIN 87.5
97	#define FREQ_MAX 108.0
98	#define FREQ_MUL 16000
99
100
101	static int usb_dsbr100_probe(struct usb_interface *intf,
102	const struct usb_device_id *id);
103	static void usb_dsbr100_disconnect(struct usb_interface *intf);
104	static int usb_dsbr100_ioctl(struct inode inode, struct file file,
105	unsigned int cmd, unsigned long arg);
106	static int usb_dsbr100_open(struct inode inode, struct file file);
107	static int usb_dsbr100_close(struct inode inode, struct file file);
108
109	static int radio_nr = -1;
110	module_param(radio_nr, int, 0);
111
112	/* Data for one (physical) device */
113	typedef struct {
114	struct usb_device *usbdev;
115	struct video_device *videodev;
116	unsigned char transfer_buffer[TB_LEN];
117	int curfreq;
118	int stereo;
119	int users;
120	int removed;
121	} dsbr100_device;
122
123
124	/* File system interface */
125	static struct file_operations usb_dsbr100_fops = {
126	.owner = THIS_MODULE,
127	.open = usb_dsbr100_open,
128	.release = usb_dsbr100_close,
129	.ioctl = usb_dsbr100_ioctl,
130	.llseek = no_llseek,
131	};
132
133	/* V4L interface */
134	static struct video_device dsbr100_videodev_template=
135	{
136	.owner = THIS_MODULE,
137	.name = "D-Link DSB-R 100",
138	.type = VID_TYPE_TUNER,
139	.hardware = VID_HARDWARE_AZTECH,
140	.fops = &usb_dsbr100_fops,
141	.release = video_device_release,
142	};
143
144	static struct usb_device_id usb_dsbr100_device_table [] = {
145	{ USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
146	{ } /* Terminating entry */
147	};
148
149	MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
150
151	/* USB subsystem interface */
152	static struct usb_driver usb_dsbr100_driver = {
1da177e4 LT	153	.name = "dsbr100",
	154	.probe = usb_dsbr100_probe,
	155	.disconnect = usb_dsbr100_disconnect,
	156	.id_table = usb_dsbr100_device_table,
	157	};
	158
	159	/* Low-level device interface begins here */
	160
	161	/* switch on radio */
	162	static int dsbr100_start(dsbr100_device *radio)
	163	{
	164	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
	165	USB_REQ_GET_STATUS,
	166	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
	167	0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 \|\|
	168	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
	169	DSB100_ONOFF,
	170	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
	171	0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
	172	return -1;
	173	return (radio->transfer_buffer)[0];
	174	}
	175
	176
	177	/* switch off radio */
	178	static int dsbr100_stop(dsbr100_device *radio)
	179	{
	180	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
	181	USB_REQ_GET_STATUS,
	182	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
	183	0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 \|\|
	184	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
	185	DSB100_ONOFF,
	186	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
	187	0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
	188	return -1;
	189	return (radio->transfer_buffer)[0];
	190	}
	191
	192	/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
	193	static int dsbr100_setfreq(dsbr100_device *radio, int freq)
	194	{
	195	freq = (freq/16*80)/1000+856;
	196	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
	197	DSB100_TUNE,
	198	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
	199	(freq>>8)&0x00ff, freq&0xff,
	200	radio->transfer_buffer, 8, 300)<0 \|\|
	201	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
	202	USB_REQ_GET_STATUS,
	203	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
	204	0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 \|\|
	205	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
	206	USB_REQ_GET_STATUS,
	207	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
	208	0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
	209	radio->stereo = -1;
	210	return -1;
	211	}
	212	radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
	213	return (radio->transfer_buffer)[0];
	214	}
	215
	216	/* return the device status. This is, in effect, just whether it
217	sees a stereo signal or not. Pity. */
218	static void dsbr100_getstat(dsbr100_device *radio)
219	{
220	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
221	USB_REQ_GET_STATUS,
222	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_IN,
223	0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
224	radio->stereo = -1;
225	else
226	radio->stereo = ! (radio->transfer_buffer[0]&0x01);
227	}
228
229
230	/* USB subsystem interface begins here */
231
232	/* check if the device is present and register with v4l and
233	usb if it is */
234	static int usb_dsbr100_probe(struct usb_interface *intf,
235	const struct usb_device_id *id)
236	{
237	dsbr100_device *radio;
238
239	if (!(radio = kmalloc(sizeof(dsbr100_device), GFP_KERNEL)))
240	return -ENOMEM;
241	if (!(radio->videodev = video_device_alloc())) {
242	kfree(radio);
243	return -ENOMEM;
244	}
245	memcpy(radio->videodev, &dsbr100_videodev_template,
246	sizeof(dsbr100_videodev_template));
247	radio->removed = 0;
248	radio->users = 0;
249	radio->usbdev = interface_to_usbdev(intf);
250	radio->curfreq = FREQ_MIN*FREQ_MUL;
251	video_set_drvdata(radio->videodev, radio);
252	if (video_register_device(radio->videodev, VFL_TYPE_RADIO,
253	radio_nr)) {
254	warn("Could not register video device");
255	video_device_release(radio->videodev);
256	kfree(radio);
257	return -EIO;
258	}
259	usb_set_intfdata(intf, radio);
260	return 0;
261	}
262
263	/* handle unplugging of the device, release data structures
264	if nothing keeps us from doing it. If something is still
265	keeping us busy, the release callback of v4l will take care
266	of releasing it. stv680.c does not relase its private
267	data, so I don't do this here either. Checking out the
268	code I'd expect I better did that, but if there's a memory
269	leak here it's tiny (~50 bytes per disconnect) */
270	static void usb_dsbr100_disconnect(struct usb_interface *intf)
271	{
272	dsbr100_device *radio = usb_get_intfdata(intf);
273
274	usb_set_intfdata (intf, NULL);
275	if (radio) {
276	video_unregister_device(radio->videodev);
277	radio->videodev = NULL;
278	if (radio->users) {
279	kfree(radio);
280	} else {
281	radio->removed = 1;
282	}
283	}
284	}
285
286
287	/* Video for Linux interface */
288
289	static int usb_dsbr100_do_ioctl(struct inode inode, struct file file,
290	unsigned int cmd, void *arg)
291	{
292	dsbr100_device *radio=video_get_drvdata(video_devdata(file));
293
294	if (!radio)
295	return -EIO;
296
297	switch(cmd) {
298	case VIDIOCGCAP: {
299	struct video_capability *v = arg;
300
301	memset(v, 0, sizeof(*v));
302	v->type = VID_TYPE_TUNER;
303	v->channels = 1;
304	v->audios = 1;
305	strcpy(v->name, "D-Link R-100 USB FM Radio");
306	return 0;
307	}
308	case VIDIOCGTUNER: {
309	struct video_tuner *v = arg;
310
311	dsbr100_getstat(radio);
312	if(v->tuner) /* Only 1 tuner */
313	return -EINVAL;
314	v->rangelow = FREQ_MIN*FREQ_MUL;
315	v->rangehigh = FREQ_MAX*FREQ_MUL;
316	v->flags = VIDEO_TUNER_LOW;
317	v->mode = VIDEO_MODE_AUTO;
318	v->signal = radio->stereo*0x7000;
319	/* Don't know how to get signal strength */
320	v->flags \|= VIDEO_TUNER_STEREO_ON*radio->stereo;
321	strcpy(v->name, "DSB R-100");
322	return 0;
323	}
324	case VIDIOCSTUNER: {
325	struct video_tuner *v = arg;
326
327	if(v->tuner!=0)
328	return -EINVAL;
329	/* Only 1 tuner so no setting needed ! */
330	return 0;
331	}
332	case VIDIOCGFREQ: {
333	int *freq = arg;
334
335	if (radio->curfreq==-1)
336	return -EINVAL;
337	*freq = radio->curfreq;
338	return 0;
339	}
340	case VIDIOCSFREQ: {
341	int *freq = arg;
342
343	radio->curfreq = *freq;
344	if (dsbr100_setfreq(radio, radio->curfreq)==-1)
345	warn("Set frequency failed");
346	return 0;
347	}
348	case VIDIOCGAUDIO: {
349	struct video_audio *v = arg;
350
351	memset(v, 0, sizeof(*v));
352	v->flags \|= VIDEO_AUDIO_MUTABLE;
353	v->mode = VIDEO_SOUND_STEREO;
354	v->volume = 1;
355	v->step = 1;
356	strcpy(v->name, "Radio");
357	return 0;
358	}
359	case VIDIOCSAUDIO: {
360	struct video_audio *v = arg;
361
362	if (v->audio)
363	return -EINVAL;
364	if (v->flags&VIDEO_AUDIO_MUTE) {
365	if (dsbr100_stop(radio)==-1)
366	warn("Radio did not respond properly");
367	}
368	else
369	if (dsbr100_start(radio)==-1)
370	warn("Radio did not respond properly");
371	return 0;
372	}
373	default:
374	return -ENOIOCTLCMD;
375	}
376	}
377
378	static int usb_dsbr100_ioctl(struct inode inode, struct file file,
379	unsigned int cmd, unsigned long arg)
380	{
381	return video_usercopy(inode, file, cmd, arg, usb_dsbr100_do_ioctl);
382	}
383
384	static int usb_dsbr100_open(struct inode inode, struct file file)
385	{
386	dsbr100_device *radio=video_get_drvdata(video_devdata(file));
387
388	radio->users = 1;
389	if (dsbr100_start(radio)<0) {
390	warn("Radio did not start up properly");
391	radio->users = 0;
392	return -EIO;
393	}
394	dsbr100_setfreq(radio, radio->curfreq);
395	return 0;
396	}
397
398	static int usb_dsbr100_close(struct inode inode, struct file file)
399	{
400	dsbr100_device *radio=video_get_drvdata(video_devdata(file));
401
402	if (!radio)
403	return -ENODEV;
404	radio->users = 0;
405	if (radio->removed) {
406	kfree(radio);
407	}
408	return 0;
409	}
410
411	static int __init dsbr100_init(void)
412	{
413	int retval = usb_register(&usb_dsbr100_driver);
414	info(DRIVER_VERSION ":" DRIVER_DESC);
415	return retval;
416	}
417
418	static void __exit dsbr100_exit(void)
419	{
420	usb_deregister(&usb_dsbr100_driver);
421	}
422
423	module_init (dsbr100_init);
424	module_exit (dsbr100_exit);
425
426	MODULE_AUTHOR( DRIVER_AUTHOR );
427	MODULE_DESCRIPTION( DRIVER_DESC );
428	MODULE_LICENSE("GPL");