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path: root/drivers/media/radio/radio-zoltrix.c
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Diffstat (limited to 'drivers/media/radio/radio-zoltrix.c')
-rw-r--r--drivers/media/radio/radio-zoltrix.c385
1 files changed, 385 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-zoltrix.c b/drivers/media/radio/radio-zoltrix.c
new file mode 100644
index 000000000000..342f92df4aba
--- /dev/null
+++ b/drivers/media/radio/radio-zoltrix.c
@@ -0,0 +1,385 @@
+/* zoltrix radio plus driver for Linux radio support
+ * (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
+ *
+ * BUGS
+ * Due to the inconsistency in reading from the signal flags
+ * it is difficult to get an accurate tuned signal.
+ *
+ * It seems that the card is not linear to 0 volume. It cuts off
+ * at a low volume, and it is not possible (at least I have not found)
+ * to get fine volume control over the low volume range.
+ *
+ * Some code derived from code by Romolo Manfredini
+ * romolo@bicnet.it
+ *
+ * 1999-05-06 - (C. van Schaik)
+ * - Make signal strength and stereo scans
+ * kinder to cpu while in delay
+ * 1999-01-05 - (C. van Schaik)
+ * - Changed tuning to 1/160Mhz accuracy
+ * - Added stereo support
+ * (card defaults to stereo)
+ * (can explicitly force mono on the card)
+ * (can detect if station is in stereo)
+ * - Added unmute function
+ * - Reworked ioctl functions
+ * 2002-07-15 - Fix Stereo typo
+ */
+
+#include <linux/module.h> /* Modules */
+#include <linux/init.h> /* Initdata */
+#include <linux/ioport.h> /* check_region, request_region */
+#include <linux/delay.h> /* udelay, msleep */
+#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_ZOLTRIX_PORT */
+
+#ifndef CONFIG_RADIO_ZOLTRIX_PORT
+#define CONFIG_RADIO_ZOLTRIX_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_ZOLTRIX_PORT;
+static int radio_nr = -1;
+
+struct zol_device {
+ int port;
+ int curvol;
+ unsigned long curfreq;
+ int muted;
+ unsigned int stereo;
+ struct semaphore lock;
+};
+
+static int zol_setvol(struct zol_device *dev, int vol)
+{
+ dev->curvol = vol;
+ if (dev->muted)
+ return 0;
+
+ down(&dev->lock);
+ if (vol == 0) {
+ outb(0, io);
+ outb(0, io);
+ inb(io + 3); /* Zoltrix needs to be read to confirm */
+ up(&dev->lock);
+ return 0;
+ }
+
+ outb(dev->curvol-1, io);
+ msleep(10);
+ inb(io + 2);
+ up(&dev->lock);
+ return 0;
+}
+
+static void zol_mute(struct zol_device *dev)
+{
+ dev->muted = 1;
+ down(&dev->lock);
+ outb(0, io);
+ outb(0, io);
+ inb(io + 3); /* Zoltrix needs to be read to confirm */
+ up(&dev->lock);
+}
+
+static void zol_unmute(struct zol_device *dev)
+{
+ dev->muted = 0;
+ zol_setvol(dev, dev->curvol);
+}
+
+static int zol_setfreq(struct zol_device *dev, unsigned long freq)
+{
+ /* tunes the radio to the desired frequency */
+ unsigned long long bitmask, f, m;
+ unsigned int stereo = dev->stereo;
+ int i;
+
+ if (freq == 0)
+ return 1;
+ m = (freq / 160 - 8800) * 2;
+ f = (unsigned long long) m + 0x4d1c;
+
+ bitmask = 0xc480402c10080000ull;
+ i = 45;
+
+ down(&dev->lock);
+
+ outb(0, io);
+ outb(0, io);
+ inb(io + 3); /* Zoltrix needs to be read to confirm */
+
+ outb(0x40, io);
+ outb(0xc0, io);
+
+ bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
+ while (i--) {
+ if ((bitmask & 0x8000000000000000ull) != 0) {
+ outb(0x80, io);
+ udelay(50);
+ outb(0x00, io);
+ udelay(50);
+ outb(0x80, io);
+ udelay(50);
+ } else {
+ outb(0xc0, io);
+ udelay(50);
+ outb(0x40, io);
+ udelay(50);
+ outb(0xc0, io);
+ udelay(50);
+ }
+ bitmask *= 2;
+ }
+ /* termination sequence */
+ outb(0x80, io);
+ outb(0xc0, io);
+ outb(0x40, io);
+ udelay(1000);
+ inb(io+2);
+
+ udelay(1000);
+
+ if (dev->muted)
+ {
+ outb(0, io);
+ outb(0, io);
+ inb(io + 3);
+ udelay(1000);
+ }
+
+ up(&dev->lock);
+
+ if(!dev->muted)
+ {
+ zol_setvol(dev, dev->curvol);
+ }
+ return 0;
+}
+
+/* Get signal strength */
+
+static int zol_getsigstr(struct zol_device *dev)
+{
+ int a, b;
+
+ down(&dev->lock);
+ outb(0x00, io); /* This stuff I found to do nothing */
+ outb(dev->curvol, io);
+ msleep(20);
+
+ a = inb(io);
+ msleep(10);
+ b = inb(io);
+
+ up(&dev->lock);
+
+ if (a != b)
+ return (0);
+
+ if ((a == 0xcf) || (a == 0xdf) /* I found this out by playing */
+ || (a == 0xef)) /* with a binary scanner on the card io */
+ return (1);
+ return (0);
+}
+
+static int zol_is_stereo (struct zol_device *dev)
+{
+ int x1, x2;
+
+ down(&dev->lock);
+
+ outb(0x00, io);
+ outb(dev->curvol, io);
+ msleep(20);
+
+ x1 = inb(io);
+ msleep(10);
+ x2 = inb(io);
+
+ up(&dev->lock);
+
+ if ((x1 == x2) && (x1 == 0xcf))
+ return 1;
+ return 0;
+}
+
+static int zol_do_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, void *arg)
+{
+ struct video_device *dev = video_devdata(file);
+ struct zol_device *zol = dev->priv;
+
+ switch (cmd) {
+ case VIDIOCGCAP:
+ {
+ struct video_capability *v = arg;
+
+ memset(v,0,sizeof(*v));
+ v->type = VID_TYPE_TUNER;
+ v->channels = 1 + zol->stereo;
+ v->audios = 1;
+ strcpy(v->name, "Zoltrix Radio");
+ return 0;
+ }
+ case VIDIOCGTUNER:
+ {
+ struct video_tuner *v = arg;
+ if (v->tuner)
+ return -EINVAL;
+ strcpy(v->name, "FM");
+ v->rangelow = (int) (88.0 * 16000);
+ v->rangehigh = (int) (108.0 * 16000);
+ v->flags = zol_is_stereo(zol)
+ ? VIDEO_TUNER_STEREO_ON : 0;
+ v->flags |= VIDEO_TUNER_LOW;
+ v->mode = VIDEO_MODE_AUTO;
+ v->signal = 0xFFFF * zol_getsigstr(zol);
+ 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 = zol->curfreq;
+ return 0;
+ }
+ case VIDIOCSFREQ:
+ {
+ unsigned long *freq = arg;
+ zol->curfreq = *freq;
+ zol_setfreq(zol, zol->curfreq);
+ return 0;
+ }
+ case VIDIOCGAUDIO:
+ {
+ struct video_audio *v = arg;
+ memset(v, 0, sizeof(*v));
+ v->flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
+ v->mode |= zol_is_stereo(zol)
+ ? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
+ v->volume = zol->curvol * 4096;
+ v->step = 4096;
+ strcpy(v->name, "Zoltrix Radio");
+ return 0;
+ }
+ case VIDIOCSAUDIO:
+ {
+ struct video_audio *v = arg;
+ if (v->audio)
+ return -EINVAL;
+
+ if (v->flags & VIDEO_AUDIO_MUTE)
+ zol_mute(zol);
+ else {
+ zol_unmute(zol);
+ zol_setvol(zol, v->volume / 4096);
+ }
+
+ if (v->mode & VIDEO_SOUND_STEREO) {
+ zol->stereo = 1;
+ zol_setfreq(zol, zol->curfreq);
+ }
+ if (v->mode & VIDEO_SOUND_MONO) {
+ zol->stereo = 0;
+ zol_setfreq(zol, zol->curfreq);
+ }
+ return 0;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static int zol_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return video_usercopy(inode, file, cmd, arg, zol_do_ioctl);
+}
+
+static struct zol_device zoltrix_unit;
+
+static struct file_operations zoltrix_fops =
+{
+ .owner = THIS_MODULE,
+ .open = video_exclusive_open,
+ .release = video_exclusive_release,
+ .ioctl = zol_ioctl,
+ .llseek = no_llseek,
+};
+
+static struct video_device zoltrix_radio =
+{
+ .owner = THIS_MODULE,
+ .name = "Zoltrix Radio Plus",
+ .type = VID_TYPE_TUNER,
+ .hardware = VID_HARDWARE_ZOLTRIX,
+ .fops = &zoltrix_fops,
+};
+
+static int __init zoltrix_init(void)
+{
+ if (io == -1) {
+ printk(KERN_ERR "You must set an I/O address with io=0x???\n");
+ return -EINVAL;
+ }
+ if ((io != 0x20c) && (io != 0x30c)) {
+ printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
+ return -ENXIO;
+ }
+
+ zoltrix_radio.priv = &zoltrix_unit;
+ if (!request_region(io, 2, "zoltrix")) {
+ printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
+ return -EBUSY;
+ }
+
+ if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
+ {
+ release_region(io, 2);
+ return -EINVAL;
+ }
+ printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
+
+ init_MUTEX(&zoltrix_unit.lock);
+
+ /* mute card - prevents noisy bootups */
+
+ /* this ensures that the volume is all the way down */
+
+ outb(0, io);
+ outb(0, io);
+ msleep(20);
+ inb(io + 3);
+
+ zoltrix_unit.curvol = 0;
+ zoltrix_unit.stereo = 1;
+
+ return 0;
+}
+
+MODULE_AUTHOR("C.van Schaik");
+MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
+MODULE_LICENSE("GPL");
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
+module_param(radio_nr, int, 0);
+
+static void __exit zoltrix_cleanup_module(void)
+{
+ video_unregister_device(&zoltrix_radio);
+ release_region(io, 2);
+}
+
+module_init(zoltrix_init);
+module_exit(zoltrix_cleanup_module);
+
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