329 lines
7.4 KiB
C
329 lines
7.4 KiB
C
/* SF16FMI radio driver for Linux radio support
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* heavily based on rtrack driver...
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* (c) 1997 M. Kirkwood
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* (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
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*
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* Fitted to new interface by Alan Cox <alan.cox@linux.org>
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* Made working and cleaned up functions <mikael.hedin@irf.se>
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* Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
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*
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* Notes on the hardware
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*
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* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
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* No volume control - only mute/unmute - you have to use line volume
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* control on SB-part of SF16FMI
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*
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*/
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#include <linux/kernel.h> /* __setup */
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#include <linux/module.h> /* Modules */
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#include <linux/init.h> /* Initdata */
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#include <linux/ioport.h> /* check_region, request_region */
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#include <linux/delay.h> /* udelay */
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#include <linux/videodev.h> /* kernel radio structs */
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#include <linux/isapnp.h>
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#include <asm/io.h> /* outb, outb_p */
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#include <asm/uaccess.h> /* copy to/from user */
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#include <asm/semaphore.h>
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struct fmi_device
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{
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int port;
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int curvol; /* 1 or 0 */
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unsigned long curfreq; /* freq in kHz */
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__u32 flags;
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};
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static int io = -1;
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static int radio_nr = -1;
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static struct pnp_dev *dev = NULL;
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static struct semaphore lock;
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/* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
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/* It is only useful to give freq in intervall of 800 (=0.05Mhz),
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* other bits will be truncated, e.g 92.7400016 -> 92.7, but
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* 92.7400017 -> 92.75
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*/
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#define RSF16_ENCODE(x) ((x)/800+214)
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#define RSF16_MINFREQ 87*16000
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#define RSF16_MAXFREQ 108*16000
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static void outbits(int bits, unsigned int data, int port)
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{
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while(bits--) {
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if(data & 1) {
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outb(5, port);
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udelay(6);
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outb(7, port);
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udelay(6);
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} else {
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outb(1, port);
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udelay(6);
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outb(3, port);
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udelay(6);
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}
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data>>=1;
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}
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}
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static inline void fmi_mute(int port)
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{
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down(&lock);
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outb(0x00, port);
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up(&lock);
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}
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static inline void fmi_unmute(int port)
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{
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down(&lock);
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outb(0x08, port);
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up(&lock);
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}
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static inline int fmi_setfreq(struct fmi_device *dev)
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{
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int myport = dev->port;
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unsigned long freq = dev->curfreq;
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down(&lock);
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outbits(16, RSF16_ENCODE(freq), myport);
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outbits(8, 0xC0, myport);
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msleep(143); /* was schedule_timeout(HZ/7) */
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up(&lock);
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if (dev->curvol) fmi_unmute(myport);
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return 0;
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}
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static inline int fmi_getsigstr(struct fmi_device *dev)
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{
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int val;
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int res;
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int myport = dev->port;
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down(&lock);
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val = dev->curvol ? 0x08 : 0x00; /* unmute/mute */
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outb(val, myport);
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outb(val | 0x10, myport);
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msleep(143); /* was schedule_timeout(HZ/7) */
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res = (int)inb(myport+1);
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outb(val, myport);
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up(&lock);
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return (res & 2) ? 0 : 0xFFFF;
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}
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static int fmi_do_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, void *arg)
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{
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struct video_device *dev = video_devdata(file);
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struct fmi_device *fmi=dev->priv;
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switch(cmd)
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{
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case VIDIOCGCAP:
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{
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struct video_capability *v = arg;
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memset(v,0,sizeof(*v));
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strcpy(v->name, "SF16-FMx radio");
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v->type=VID_TYPE_TUNER;
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v->channels=1;
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v->audios=1;
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return 0;
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}
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case VIDIOCGTUNER:
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{
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struct video_tuner *v = arg;
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int mult;
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if(v->tuner) /* Only 1 tuner */
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return -EINVAL;
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strcpy(v->name, "FM");
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mult = (fmi->flags & VIDEO_TUNER_LOW) ? 1 : 1000;
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v->rangelow = RSF16_MINFREQ/mult;
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v->rangehigh = RSF16_MAXFREQ/mult;
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v->flags=fmi->flags;
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v->mode=VIDEO_MODE_AUTO;
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v->signal = fmi_getsigstr(fmi);
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return 0;
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}
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case VIDIOCSTUNER:
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{
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struct video_tuner *v = arg;
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if(v->tuner!=0)
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return -EINVAL;
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fmi->flags = v->flags & VIDEO_TUNER_LOW;
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/* Only 1 tuner so no setting needed ! */
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return 0;
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}
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case VIDIOCGFREQ:
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{
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unsigned long *freq = arg;
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*freq = fmi->curfreq;
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if (!(fmi->flags & VIDEO_TUNER_LOW))
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*freq /= 1000;
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return 0;
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}
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case VIDIOCSFREQ:
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{
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unsigned long *freq = arg;
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if (!(fmi->flags & VIDEO_TUNER_LOW))
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*freq *= 1000;
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if (*freq < RSF16_MINFREQ || *freq > RSF16_MAXFREQ )
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return -EINVAL;
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/*rounding in steps of 800 to match th freq
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that will be used */
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fmi->curfreq = (*freq/800)*800;
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fmi_setfreq(fmi);
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return 0;
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}
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case VIDIOCGAUDIO:
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{
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struct video_audio *v = arg;
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memset(v,0,sizeof(*v));
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v->flags=( (!fmi->curvol)*VIDEO_AUDIO_MUTE | VIDEO_AUDIO_MUTABLE);
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strcpy(v->name, "Radio");
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v->mode=VIDEO_SOUND_STEREO;
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return 0;
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}
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case VIDIOCSAUDIO:
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{
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struct video_audio *v = arg;
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if(v->audio)
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return -EINVAL;
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fmi->curvol= v->flags&VIDEO_AUDIO_MUTE ? 0 : 1;
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fmi->curvol ?
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fmi_unmute(fmi->port) : fmi_mute(fmi->port);
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return 0;
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}
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case VIDIOCGUNIT:
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{
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struct video_unit *v = arg;
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v->video=VIDEO_NO_UNIT;
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v->vbi=VIDEO_NO_UNIT;
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v->radio=dev->minor;
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v->audio=0; /* How do we find out this??? */
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v->teletext=VIDEO_NO_UNIT;
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return 0;
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}
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default:
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return -ENOIOCTLCMD;
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}
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}
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static int fmi_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return video_usercopy(inode, file, cmd, arg, fmi_do_ioctl);
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}
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static struct fmi_device fmi_unit;
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static struct file_operations fmi_fops = {
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.owner = THIS_MODULE,
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.open = video_exclusive_open,
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.release = video_exclusive_release,
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.ioctl = fmi_ioctl,
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.llseek = no_llseek,
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};
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static struct video_device fmi_radio=
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{
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.owner = THIS_MODULE,
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.name = "SF16FMx radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_SF16MI,
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.fops = &fmi_fops,
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};
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/* ladis: this is my card. does any other types exist? */
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static struct isapnp_device_id id_table[] __devinitdata = {
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{ ISAPNP_ANY_ID, ISAPNP_ANY_ID,
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ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
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{ ISAPNP_CARD_END, },
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};
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MODULE_DEVICE_TABLE(isapnp, id_table);
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static int isapnp_fmi_probe(void)
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{
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int i = 0;
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while (id_table[i].card_vendor != 0 && dev == NULL) {
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dev = pnp_find_dev(NULL, id_table[i].vendor,
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id_table[i].function, NULL);
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i++;
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}
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if (!dev)
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return -ENODEV;
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if (pnp_device_attach(dev) < 0)
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return -EAGAIN;
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if (pnp_activate_dev(dev) < 0) {
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printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
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pnp_device_detach(dev);
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return -ENOMEM;
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}
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if (!pnp_port_valid(dev, 0)) {
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pnp_device_detach(dev);
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return -ENODEV;
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}
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i = pnp_port_start(dev, 0);
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printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
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return i;
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}
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static int __init fmi_init(void)
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{
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if (io < 0)
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io = isapnp_fmi_probe();
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if (io < 0) {
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printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
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return io;
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}
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if (!request_region(io, 2, "radio-sf16fmi")) {
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printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
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return -EBUSY;
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}
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fmi_unit.port = io;
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fmi_unit.curvol = 0;
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fmi_unit.curfreq = 0;
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fmi_unit.flags = VIDEO_TUNER_LOW;
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fmi_radio.priv = &fmi_unit;
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init_MUTEX(&lock);
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if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) {
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release_region(io, 2);
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return -EINVAL;
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}
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printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
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/* mute card - prevents noisy bootups */
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fmi_mute(io);
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return 0;
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}
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MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
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MODULE_DESCRIPTION("A driver for the SF16MI radio.");
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MODULE_LICENSE("GPL");
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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
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module_param(radio_nr, int, 0);
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static void __exit fmi_cleanup_module(void)
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{
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video_unregister_device(&fmi_radio);
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release_region(io, 2);
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if (dev)
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pnp_device_detach(dev);
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}
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module_init(fmi_init);
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module_exit(fmi_cleanup_module);
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