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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/radio/radio-aimslab.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/media/radio/radio-aimslab.c')
-rw-r--r-- | drivers/media/radio/radio-aimslab.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aimslab.c b/drivers/media/radio/radio-aimslab.c new file mode 100644 index 0000000..8b4ad70 --- /dev/null +++ b/drivers/media/radio/radio-aimslab.c @@ -0,0 +1,368 @@ +/* radiotrack (radioreveal) driver for Linux radio support + * (c) 1997 M. Kirkwood + * Converted to new API by Alan Cox <Alan.Cox@linux.org> + * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> + * + * History: + * 1999-02-24 Russell Kroll <rkroll@exploits.org> + * Fine tuning/VIDEO_TUNER_LOW + * Frequency range expanded to start at 87 MHz + * + * TODO: Allow for more than one of these foolish entities :-) + * + * Notes on the hardware (reverse engineered from other peoples' + * reverse engineering of AIMS' code :-) + * + * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); + * + * The signal strength query is unsurprisingly inaccurate. And it seems + * to indicate that (on my card, at least) the frequency setting isn't + * too great. (I have to tune up .025MHz from what the freq should be + * to get a report that the thing is tuned.) + * + * Volume control is (ugh) analogue: + * out(port, start_increasing_volume); + * wait(a_wee_while); + * out(port, stop_changing_the_volume); + * + */ + +#include <linux/module.h> /* Modules */ +#include <linux/init.h> /* Initdata */ +#include <linux/ioport.h> /* check_region, request_region */ +#include <linux/delay.h> /* udelay */ +#include <asm/io.h> /* outb, outb_p */ +#include <asm/uaccess.h> /* copy to/from user */ +#include <linux/videodev.h> /* kernel radio structs */ +#include <linux/config.h> /* CONFIG_RADIO_RTRACK_PORT */ +#include <asm/semaphore.h> /* Lock for the I/O */ + +#ifndef CONFIG_RADIO_RTRACK_PORT +#define CONFIG_RADIO_RTRACK_PORT -1 +#endif + +static int io = CONFIG_RADIO_RTRACK_PORT; +static int radio_nr = -1; +static struct semaphore lock; + +struct rt_device +{ + int port; + int curvol; + unsigned long curfreq; + int muted; +}; + + +/* local things */ + +static void sleep_delay(long n) +{ + /* Sleep nicely for 'n' uS */ + int d=n/(1000000/HZ); + if(!d) + udelay(n); + else + msleep(jiffies_to_msecs(d)); +} + +static void rt_decvol(void) +{ + outb(0x58, io); /* volume down + sigstr + on */ + sleep_delay(100000); + outb(0xd8, io); /* volume steady + sigstr + on */ +} + +static void rt_incvol(void) +{ + outb(0x98, io); /* volume up + sigstr + on */ + sleep_delay(100000); + outb(0xd8, io); /* volume steady + sigstr + on */ +} + +static void rt_mute(struct rt_device *dev) +{ + dev->muted = 1; + down(&lock); + outb(0xd0, io); /* volume steady, off */ + up(&lock); +} + +static int rt_setvol(struct rt_device *dev, int vol) +{ + int i; + + down(&lock); + + if(vol == dev->curvol) { /* requested volume = current */ + if (dev->muted) { /* user is unmuting the card */ + dev->muted = 0; + outb (0xd8, io); /* enable card */ + } + up(&lock); + return 0; + } + + if(vol == 0) { /* volume = 0 means mute the card */ + outb(0x48, io); /* volume down but still "on" */ + sleep_delay(2000000); /* make sure it's totally down */ + outb(0xd0, io); /* volume steady, off */ + dev->curvol = 0; /* track the volume state! */ + up(&lock); + return 0; + } + + dev->muted = 0; + if(vol > dev->curvol) + for(i = dev->curvol; i < vol; i++) + rt_incvol(); + else + for(i = dev->curvol; i > vol; i--) + rt_decvol(); + + dev->curvol = vol; + up(&lock); + return 0; +} + +/* the 128+64 on these outb's is to keep the volume stable while tuning + * without them, the volume _will_ creep up with each frequency change + * and bit 4 (+16) is to keep the signal strength meter enabled + */ + +static void send_0_byte(int port, struct rt_device *dev) +{ + if ((dev->curvol == 0) || (dev->muted)) { + outb_p(128+64+16+ 1, port); /* wr-enable + data low */ + outb_p(128+64+16+2+1, port); /* clock */ + } + else { + outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */ + outb_p(128+64+16+8+2+1, port); /* clock */ + } + sleep_delay(1000); +} + +static void send_1_byte(int port, struct rt_device *dev) +{ + if ((dev->curvol == 0) || (dev->muted)) { + outb_p(128+64+16+4 +1, port); /* wr-enable+data high */ + outb_p(128+64+16+4+2+1, port); /* clock */ + } + else { + outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */ + outb_p(128+64+16+8+4+2+1, port); /* clock */ + } + + sleep_delay(1000); +} + +static int rt_setfreq(struct rt_device *dev, unsigned long freq) +{ + int i; + + /* adapted from radio-aztech.c */ + + /* now uses VIDEO_TUNER_LOW for fine tuning */ + + freq += 171200; /* Add 10.7 MHz IF */ + freq /= 800; /* Convert to 50 kHz units */ + + down(&lock); /* Stop other ops interfering */ + + send_0_byte (io, dev); /* 0: LSB of frequency */ + + for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ + if (freq & (1 << i)) + send_1_byte (io, dev); + else + send_0_byte (io, dev); + + send_0_byte (io, dev); /* 14: test bit - always 0 */ + send_0_byte (io, dev); /* 15: test bit - always 0 */ + + send_0_byte (io, dev); /* 16: band data 0 - always 0 */ + send_0_byte (io, dev); /* 17: band data 1 - always 0 */ + send_0_byte (io, dev); /* 18: band data 2 - always 0 */ + send_0_byte (io, dev); /* 19: time base - always 0 */ + + send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */ + send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */ + send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */ + send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */ + + if ((dev->curvol == 0) || (dev->muted)) + outb (0xd0, io); /* volume steady + sigstr */ + else + outb (0xd8, io); /* volume steady + sigstr + on */ + + up(&lock); + + return 0; +} + +static int rt_getsigstr(struct rt_device *dev) +{ + if (inb(io) & 2) /* bit set = no signal present */ + return 0; + return 1; /* signal present */ +} + +static int rt_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *arg) +{ + struct video_device *dev = video_devdata(file); + struct rt_device *rt=dev->priv; + + 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, "RadioTrack"); + return 0; + } + case VIDIOCGTUNER: + { + struct video_tuner *v = arg; + if(v->tuner) /* Only 1 tuner */ + return -EINVAL; + v->rangelow=(87*16000); + v->rangehigh=(108*16000); + v->flags=VIDEO_TUNER_LOW; + v->mode=VIDEO_MODE_AUTO; + strcpy(v->name, "FM"); + v->signal=0xFFFF*rt_getsigstr(rt); + 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: + { + unsigned long *freq = arg; + *freq = rt->curfreq; + return 0; + } + case VIDIOCSFREQ: + { + unsigned long *freq = arg; + rt->curfreq = *freq; + rt_setfreq(rt, rt->curfreq); + return 0; + } + case VIDIOCGAUDIO: + { + struct video_audio *v = arg; + memset(v,0, sizeof(*v)); + v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME; + v->volume=rt->curvol * 6554; + v->step=6554; + strcpy(v->name, "Radio"); + return 0; + } + case VIDIOCSAUDIO: + { + struct video_audio *v = arg; + if(v->audio) + return -EINVAL; + if(v->flags&VIDEO_AUDIO_MUTE) + rt_mute(rt); + else + rt_setvol(rt,v->volume/6554); + return 0; + } + default: + return -ENOIOCTLCMD; + } +} + +static int rt_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return video_usercopy(inode, file, cmd, arg, rt_do_ioctl); +} + +static struct rt_device rtrack_unit; + +static struct file_operations rtrack_fops = { + .owner = THIS_MODULE, + .open = video_exclusive_open, + .release = video_exclusive_release, + .ioctl = rt_ioctl, + .llseek = no_llseek, +}; + +static struct video_device rtrack_radio= +{ + .owner = THIS_MODULE, + .name = "RadioTrack radio", + .type = VID_TYPE_TUNER, + .hardware = VID_HARDWARE_RTRACK, + .fops = &rtrack_fops, +}; + +static int __init rtrack_init(void) +{ + if(io==-1) + { + printk(KERN_ERR "You must set an I/O address with io=0x???\n"); + return -EINVAL; + } + + if (!request_region(io, 2, "rtrack")) + { + printk(KERN_ERR "rtrack: port 0x%x already in use\n", io); + return -EBUSY; + } + + rtrack_radio.priv=&rtrack_unit; + + if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1) + { + release_region(io, 2); + return -EINVAL; + } + printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n"); + + /* Set up the I/O locking */ + + init_MUTEX(&lock); + + /* mute card - prevents noisy bootups */ + + /* this ensures that the volume is all the way down */ + outb(0x48, io); /* volume down but still "on" */ + sleep_delay(2000000); /* make sure it's totally down */ + outb(0xc0, io); /* steady volume, mute card */ + rtrack_unit.curvol = 0; + + return 0; +} + +MODULE_AUTHOR("M.Kirkwood"); +MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card."); +MODULE_LICENSE("GPL"); + +module_param(io, int, 0); +MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)"); +module_param(radio_nr, int, 0); + +static void __exit cleanup_rtrack_module(void) +{ + video_unregister_device(&rtrack_radio); + release_region(io,2); +} + +module_init(rtrack_init); +module_exit(cleanup_rtrack_module); + |