diff options
Diffstat (limited to 'drivers/media/video/dsbr100.c')
| -rw-r--r-- | drivers/media/video/dsbr100.c | 429 |
1 files changed, 429 insertions, 0 deletions
diff --git a/drivers/media/video/dsbr100.c b/drivers/media/video/dsbr100.c new file mode 100644 index 00000000000..25646804d5b --- /dev/null +++ b/drivers/media/video/dsbr100.c @@ -0,0 +1,429 @@ +/* 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, + .compat_ioctl = v4l_compat_ioctl32, + .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"); |