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path: root/drivers/media/radio/radio-aimslab.c
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Diffstat (limited to 'drivers/media/radio/radio-aimslab.c')
-rw-r--r--drivers/media/radio/radio-aimslab.c368
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 00000000000..8b4ad70dd1b
--- /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);
+
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