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-rw-r--r--drivers/media/radio/radio-aztech.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aztech.c b/drivers/media/radio/radio-aztech.c
new file mode 100644
index 000000000000..013c835ed910
--- /dev/null
+++ b/drivers/media/radio/radio-aztech.c
@@ -0,0 +1,315 @@
+/* radio-aztech.c - Aztech radio card driver for Linux 2.2
+ *
+ * Adapted to support the Video for Linux API by
+ * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
+ *
+ * Quay Ly
+ * Donald Song
+ * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
+ * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
+ * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
+ *
+ * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
+ * along with more information on the card itself.
+ *
+ * History:
+ * 1999-02-24 Russell Kroll <rkroll@exploits.org>
+ * Fine tuning/VIDEO_TUNER_LOW
+ * Range expanded to 87-108 MHz (from 87.9-107.8)
+ *
+ * Notable changes from the original source:
+ * - includes stripped down to the essentials
+ * - for loops used as delays replaced with udelay()
+ * - #defines removed, changed to static values
+ * - tuning structure changed - no more character arrays, other changes
+*/
+
+#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_AZTECH_PORT */
+
+/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
+
+#ifndef CONFIG_RADIO_AZTECH_PORT
+#define CONFIG_RADIO_AZTECH_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_AZTECH_PORT;
+static int radio_nr = -1;
+static int radio_wait_time = 1000;
+static struct semaphore lock;
+
+struct az_device
+{
+ int curvol;
+ unsigned long curfreq;
+ int stereo;
+};
+
+static int volconvert(int level)
+{
+ level>>=14; /* Map 16bits down to 2 bit */
+ level&=3;
+
+ /* convert to card-friendly values */
+ switch (level)
+ {
+ case 0:
+ return 0;
+ case 1:
+ return 1;
+ case 2:
+ return 4;
+ case 3:
+ return 5;
+ }
+ return 0; /* Quieten gcc */
+}
+
+static void send_0_byte (struct az_device *dev)
+{
+ udelay(radio_wait_time);
+ outb_p(2+volconvert(dev->curvol), io);
+ outb_p(64+2+volconvert(dev->curvol), io);
+}
+
+static void send_1_byte (struct az_device *dev)
+{
+ udelay (radio_wait_time);
+ outb_p(128+2+volconvert(dev->curvol), io);
+ outb_p(128+64+2+volconvert(dev->curvol), io);
+}
+
+static int az_setvol(struct az_device *dev, int vol)
+{
+ down(&lock);
+ outb (volconvert(vol), io);
+ up(&lock);
+ return 0;
+}
+
+/* thanks to Michael Dwyer for giving me a dose of clues in
+ * the signal strength department..
+ *
+ * This card has a stereo bit - bit 0 set = mono, not set = stereo
+ * It also has a "signal" bit - bit 1 set = bad signal, not set = good
+ *
+ */
+
+static int az_getsigstr(struct az_device *dev)
+{
+ if (inb(io) & 2) /* bit set = no signal present */
+ return 0;
+ return 1; /* signal present */
+}
+
+static int az_getstereo(struct az_device *dev)
+{
+ if (inb(io) & 1) /* bit set = mono */
+ return 0;
+ return 1; /* stereo */
+}
+
+static int az_setfreq(struct az_device *dev, unsigned long frequency)
+{
+ int i;
+
+ frequency += 171200; /* Add 10.7 MHz IF */
+ frequency /= 800; /* Convert to 50 kHz units */
+
+ down(&lock);
+
+ send_0_byte (dev); /* 0: LSB of frequency */
+
+ for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
+ if (frequency & (1 << i))
+ send_1_byte (dev);
+ else
+ send_0_byte (dev);
+
+ send_0_byte (dev); /* 14: test bit - always 0 */
+ send_0_byte (dev); /* 15: test bit - always 0 */
+ send_0_byte (dev); /* 16: band data 0 - always 0 */
+ if (dev->stereo) /* 17: stereo (1 to enable) */
+ send_1_byte (dev);
+ else
+ send_0_byte (dev);
+
+ send_1_byte (dev); /* 18: band data 1 - unknown */
+ send_0_byte (dev); /* 19: time base - always 0 */
+ send_0_byte (dev); /* 20: spacing (0 = 25 kHz) */
+ send_1_byte (dev); /* 21: spacing (1 = 25 kHz) */
+ send_0_byte (dev); /* 22: spacing (0 = 25 kHz) */
+ send_1_byte (dev); /* 23: AM/FM (FM = 1, always) */
+
+ /* latch frequency */
+
+ udelay (radio_wait_time);
+ outb_p(128+64+volconvert(dev->curvol), io);
+
+ up(&lock);
+
+ return 0;
+}
+
+static int az_do_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, void *arg)
+{
+ struct video_device *dev = video_devdata(file);
+ struct az_device *az = 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, "Aztech Radio");
+ 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;
+ v->signal=0xFFFF*az_getsigstr(az);
+ if(az_getstereo(az))
+ v->flags|=VIDEO_TUNER_STEREO_ON;
+ strcpy(v->name, "FM");
+ return 0;
+ }
+ case VIDIOCSTUNER:
+ {
+ struct video_tuner *v = arg;
+ if(v->tuner!=0)
+ return -EINVAL;
+ return 0;
+ }
+ case VIDIOCGFREQ:
+ {
+ unsigned long *freq = arg;
+ *freq = az->curfreq;
+ return 0;
+ }
+ case VIDIOCSFREQ:
+ {
+ unsigned long *freq = arg;
+ az->curfreq = *freq;
+ az_setfreq(az, az->curfreq);
+ return 0;
+ }
+ case VIDIOCGAUDIO:
+ {
+ struct video_audio *v = arg;
+ memset(v,0, sizeof(*v));
+ v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
+ if(az->stereo)
+ v->mode=VIDEO_SOUND_STEREO;
+ else
+ v->mode=VIDEO_SOUND_MONO;
+ v->volume=az->curvol;
+ v->step=16384;
+ strcpy(v->name, "Radio");
+ return 0;
+ }
+ case VIDIOCSAUDIO:
+ {
+ struct video_audio *v = arg;
+ if(v->audio)
+ return -EINVAL;
+ az->curvol=v->volume;
+
+ az->stereo=(v->mode&VIDEO_SOUND_STEREO)?1:0;
+ if(v->flags&VIDEO_AUDIO_MUTE)
+ az_setvol(az,0);
+ else
+ az_setvol(az,az->curvol);
+ return 0;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static int az_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return video_usercopy(inode, file, cmd, arg, az_do_ioctl);
+}
+
+static struct az_device aztech_unit;
+
+static struct file_operations aztech_fops = {
+ .owner = THIS_MODULE,
+ .open = video_exclusive_open,
+ .release = video_exclusive_release,
+ .ioctl = az_ioctl,
+ .llseek = no_llseek,
+};
+
+static struct video_device aztech_radio=
+{
+ .owner = THIS_MODULE,
+ .name = "Aztech radio",
+ .type = VID_TYPE_TUNER,
+ .hardware = VID_HARDWARE_AZTECH,
+ .fops = &aztech_fops,
+};
+
+static int __init aztech_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, "aztech"))
+ {
+ printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
+ return -EBUSY;
+ }
+
+ init_MUTEX(&lock);
+ aztech_radio.priv=&aztech_unit;
+
+ if(video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr)==-1)
+ {
+ release_region(io,2);
+ return -EINVAL;
+ }
+
+ printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
+ /* mute card - prevents noisy bootups */
+ outb (0, io);
+ return 0;
+}
+
+MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
+MODULE_DESCRIPTION("A driver for the Aztech radio card.");
+MODULE_LICENSE("GPL");
+
+module_param(io, int, 0);
+module_param(radio_nr, int, 0);
+MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
+
+static void __exit aztech_cleanup(void)
+{
+ video_unregister_device(&aztech_radio);
+ release_region(io,2);
+}
+
+module_init(aztech_init);
+module_exit(aztech_cleanup);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.