370 lines
8.8 KiB
C
370 lines
8.8 KiB
C
/* radiotrack (radioreveal) driver for Linux radio support
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* (c) 1997 M. Kirkwood
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* Converted to new API by Alan Cox <Alan.Cox@linux.org>
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* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
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*
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* History:
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* 1999-02-24 Russell Kroll <rkroll@exploits.org>
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* Fine tuning/VIDEO_TUNER_LOW
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* Frequency range expanded to start at 87 MHz
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*
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* TODO: Allow for more than one of these foolish entities :-)
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*
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* Notes on the hardware (reverse engineered from other peoples'
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* reverse engineering of AIMS' code :-)
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*
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* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
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*
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* The signal strength query is unsurprisingly inaccurate. And it seems
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* to indicate that (on my card, at least) the frequency setting isn't
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* too great. (I have to tune up .025MHz from what the freq should be
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* to get a report that the thing is tuned.)
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*
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* Volume control is (ugh) analogue:
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* out(port, start_increasing_volume);
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* wait(a_wee_while);
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* out(port, stop_changing_the_volume);
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*
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*/
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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> /* request_region */
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#include <linux/delay.h> /* udelay */
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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 <linux/videodev.h> /* kernel radio structs */
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#include <linux/config.h> /* CONFIG_RADIO_RTRACK_PORT */
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#include <asm/semaphore.h> /* Lock for the I/O */
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#ifndef CONFIG_RADIO_RTRACK_PORT
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#define CONFIG_RADIO_RTRACK_PORT -1
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#endif
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static int io = CONFIG_RADIO_RTRACK_PORT;
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static int radio_nr = -1;
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static struct semaphore lock;
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struct rt_device
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{
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int port;
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int curvol;
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unsigned long curfreq;
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int muted;
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};
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/* local things */
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static void sleep_delay(long n)
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{
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/* Sleep nicely for 'n' uS */
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int d=n/(1000000/HZ);
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if(!d)
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udelay(n);
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else
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msleep(jiffies_to_msecs(d));
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}
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static void rt_decvol(void)
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{
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outb(0x58, io); /* volume down + sigstr + on */
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sleep_delay(100000);
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outb(0xd8, io); /* volume steady + sigstr + on */
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}
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static void rt_incvol(void)
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{
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outb(0x98, io); /* volume up + sigstr + on */
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sleep_delay(100000);
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outb(0xd8, io); /* volume steady + sigstr + on */
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}
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static void rt_mute(struct rt_device *dev)
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{
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dev->muted = 1;
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down(&lock);
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outb(0xd0, io); /* volume steady, off */
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up(&lock);
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}
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static int rt_setvol(struct rt_device *dev, int vol)
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{
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int i;
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down(&lock);
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if(vol == dev->curvol) { /* requested volume = current */
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if (dev->muted) { /* user is unmuting the card */
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dev->muted = 0;
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outb (0xd8, io); /* enable card */
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}
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up(&lock);
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return 0;
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}
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if(vol == 0) { /* volume = 0 means mute the card */
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outb(0x48, io); /* volume down but still "on" */
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sleep_delay(2000000); /* make sure it's totally down */
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outb(0xd0, io); /* volume steady, off */
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dev->curvol = 0; /* track the volume state! */
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up(&lock);
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return 0;
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}
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dev->muted = 0;
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if(vol > dev->curvol)
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for(i = dev->curvol; i < vol; i++)
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rt_incvol();
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else
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for(i = dev->curvol; i > vol; i--)
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rt_decvol();
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dev->curvol = vol;
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up(&lock);
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return 0;
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}
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/* the 128+64 on these outb's is to keep the volume stable while tuning
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* without them, the volume _will_ creep up with each frequency change
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* and bit 4 (+16) is to keep the signal strength meter enabled
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*/
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static void send_0_byte(int port, struct rt_device *dev)
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{
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if ((dev->curvol == 0) || (dev->muted)) {
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outb_p(128+64+16+ 1, port); /* wr-enable + data low */
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outb_p(128+64+16+2+1, port); /* clock */
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}
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else {
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outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */
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outb_p(128+64+16+8+2+1, port); /* clock */
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}
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sleep_delay(1000);
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}
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static void send_1_byte(int port, struct rt_device *dev)
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{
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if ((dev->curvol == 0) || (dev->muted)) {
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outb_p(128+64+16+4 +1, port); /* wr-enable+data high */
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outb_p(128+64+16+4+2+1, port); /* clock */
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}
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else {
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outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */
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outb_p(128+64+16+8+4+2+1, port); /* clock */
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}
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sleep_delay(1000);
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}
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static int rt_setfreq(struct rt_device *dev, unsigned long freq)
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{
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int i;
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/* adapted from radio-aztech.c */
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/* now uses VIDEO_TUNER_LOW for fine tuning */
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freq += 171200; /* Add 10.7 MHz IF */
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freq /= 800; /* Convert to 50 kHz units */
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down(&lock); /* Stop other ops interfering */
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send_0_byte (io, dev); /* 0: LSB of frequency */
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for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
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if (freq & (1 << i))
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send_1_byte (io, dev);
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else
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send_0_byte (io, dev);
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send_0_byte (io, dev); /* 14: test bit - always 0 */
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send_0_byte (io, dev); /* 15: test bit - always 0 */
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send_0_byte (io, dev); /* 16: band data 0 - always 0 */
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send_0_byte (io, dev); /* 17: band data 1 - always 0 */
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send_0_byte (io, dev); /* 18: band data 2 - always 0 */
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send_0_byte (io, dev); /* 19: time base - always 0 */
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send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */
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send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */
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send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */
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send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */
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if ((dev->curvol == 0) || (dev->muted))
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outb (0xd0, io); /* volume steady + sigstr */
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else
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outb (0xd8, io); /* volume steady + sigstr + on */
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up(&lock);
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return 0;
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}
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static int rt_getsigstr(struct rt_device *dev)
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{
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if (inb(io) & 2) /* bit set = no signal present */
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return 0;
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return 1; /* signal present */
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}
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static int rt_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 rt_device *rt=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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v->type=VID_TYPE_TUNER;
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v->channels=1;
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v->audios=1;
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strcpy(v->name, "RadioTrack");
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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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if(v->tuner) /* Only 1 tuner */
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return -EINVAL;
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v->rangelow=(87*16000);
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v->rangehigh=(108*16000);
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v->flags=VIDEO_TUNER_LOW;
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v->mode=VIDEO_MODE_AUTO;
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strcpy(v->name, "FM");
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v->signal=0xFFFF*rt_getsigstr(rt);
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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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/* 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 = rt->curfreq;
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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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rt->curfreq = *freq;
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rt_setfreq(rt, rt->curfreq);
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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|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
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v->volume=rt->curvol * 6554;
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v->step=6554;
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strcpy(v->name, "Radio");
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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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if(v->flags&VIDEO_AUDIO_MUTE)
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rt_mute(rt);
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else
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rt_setvol(rt,v->volume/6554);
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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 rt_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, rt_do_ioctl);
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}
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static struct rt_device rtrack_unit;
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static struct file_operations rtrack_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 = rt_ioctl,
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.compat_ioctl = v4l_compat_ioctl32,
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.llseek = no_llseek,
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};
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static struct video_device rtrack_radio=
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{
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.owner = THIS_MODULE,
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.name = "RadioTrack radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_RTRACK,
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.fops = &rtrack_fops,
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};
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static int __init rtrack_init(void)
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{
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if(io==-1)
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{
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printk(KERN_ERR "You must set an I/O address with io=0x???\n");
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return -EINVAL;
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}
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if (!request_region(io, 2, "rtrack"))
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{
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printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
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return -EBUSY;
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}
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rtrack_radio.priv=&rtrack_unit;
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if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
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{
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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 "AIMSlab RadioTrack/RadioReveal card driver.\n");
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/* Set up the I/O locking */
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init_MUTEX(&lock);
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/* mute card - prevents noisy bootups */
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/* this ensures that the volume is all the way down */
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outb(0x48, io); /* volume down but still "on" */
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sleep_delay(2000000); /* make sure it's totally down */
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outb(0xc0, io); /* steady volume, mute card */
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rtrack_unit.curvol = 0;
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return 0;
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}
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MODULE_AUTHOR("M.Kirkwood");
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MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
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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 RadioTrack card (0x20f or 0x30f)");
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module_param(radio_nr, int, 0);
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static void __exit cleanup_rtrack_module(void)
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{
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video_unregister_device(&rtrack_radio);
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release_region(io,2);
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}
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module_init(rtrack_init);
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module_exit(cleanup_rtrack_module);
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