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path: root/drivers/media/radio/radio-sf16fmi.c
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-rw-r--r--drivers/media/radio/radio-sf16fmi.c328
1 files changed, 328 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-sf16fmi.c b/drivers/media/radio/radio-sf16fmi.c
new file mode 100644
index 000000000000..3a464a09221f
--- /dev/null
+++ b/drivers/media/radio/radio-sf16fmi.c
@@ -0,0 +1,328 @@
+/* SF16FMI radio driver for Linux radio support
+ * heavily based on rtrack driver...
+ * (c) 1997 M. Kirkwood
+ * (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
+ *
+ * Fitted to new interface by Alan Cox <alan.cox@linux.org>
+ * Made working and cleaned up functions <mikael.hedin@irf.se>
+ * Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
+ *
+ * Notes on the hardware
+ *
+ * Frequency control is done digitally -- ie out(port,encodefreq(95.8));
+ * No volume control - only mute/unmute - you have to use line volume
+ * control on SB-part of SF16FMI
+ *
+ */
+
+#include <linux/kernel.h> /* __setup */
+#include <linux/module.h> /* Modules */
+#include <linux/init.h> /* Initdata */
+#include <linux/ioport.h> /* check_region, request_region */
+#include <linux/delay.h> /* udelay */
+#include <linux/videodev.h> /* kernel radio structs */
+#include <linux/isapnp.h>
+#include <asm/io.h> /* outb, outb_p */
+#include <asm/uaccess.h> /* copy to/from user */
+#include <asm/semaphore.h>
+
+struct fmi_device
+{
+ int port;
+ int curvol; /* 1 or 0 */
+ unsigned long curfreq; /* freq in kHz */
+ __u32 flags;
+};
+
+static int io = -1;
+static int radio_nr = -1;
+static struct pnp_dev *dev = NULL;
+static struct semaphore lock;
+
+/* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
+/* It is only useful to give freq in intervall of 800 (=0.05Mhz),
+ * other bits will be truncated, e.g 92.7400016 -> 92.7, but
+ * 92.7400017 -> 92.75
+ */
+#define RSF16_ENCODE(x) ((x)/800+214)
+#define RSF16_MINFREQ 87*16000
+#define RSF16_MAXFREQ 108*16000
+
+static void outbits(int bits, unsigned int data, int port)
+{
+ while(bits--) {
+ if(data & 1) {
+ outb(5, port);
+ udelay(6);
+ outb(7, port);
+ udelay(6);
+ } else {
+ outb(1, port);
+ udelay(6);
+ outb(3, port);
+ udelay(6);
+ }
+ data>>=1;
+ }
+}
+
+static inline void fmi_mute(int port)
+{
+ down(&lock);
+ outb(0x00, port);
+ up(&lock);
+}
+
+static inline void fmi_unmute(int port)
+{
+ down(&lock);
+ outb(0x08, port);
+ up(&lock);
+}
+
+static inline int fmi_setfreq(struct fmi_device *dev)
+{
+ int myport = dev->port;
+ unsigned long freq = dev->curfreq;
+
+ down(&lock);
+
+ outbits(16, RSF16_ENCODE(freq), myport);
+ outbits(8, 0xC0, myport);
+ msleep(143); /* was schedule_timeout(HZ/7) */
+ up(&lock);
+ if (dev->curvol) fmi_unmute(myport);
+ return 0;
+}
+
+static inline int fmi_getsigstr(struct fmi_device *dev)
+{
+ int val;
+ int res;
+ int myport = dev->port;
+
+
+ down(&lock);
+ val = dev->curvol ? 0x08 : 0x00; /* unmute/mute */
+ outb(val, myport);
+ outb(val | 0x10, myport);
+ msleep(143); /* was schedule_timeout(HZ/7) */
+ res = (int)inb(myport+1);
+ outb(val, myport);
+
+ up(&lock);
+ return (res & 2) ? 0 : 0xFFFF;
+}
+
+static int fmi_do_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, void *arg)
+{
+ struct video_device *dev = video_devdata(file);
+ struct fmi_device *fmi=dev->priv;
+
+ switch(cmd)
+ {
+ case VIDIOCGCAP:
+ {
+ struct video_capability *v = arg;
+ memset(v,0,sizeof(*v));
+ strcpy(v->name, "SF16-FMx radio");
+ v->type=VID_TYPE_TUNER;
+ v->channels=1;
+ v->audios=1;
+ return 0;
+ }
+ case VIDIOCGTUNER:
+ {
+ struct video_tuner *v = arg;
+ int mult;
+
+ if(v->tuner) /* Only 1 tuner */
+ return -EINVAL;
+ strcpy(v->name, "FM");
+ mult = (fmi->flags & VIDEO_TUNER_LOW) ? 1 : 1000;
+ v->rangelow = RSF16_MINFREQ/mult;
+ v->rangehigh = RSF16_MAXFREQ/mult;
+ v->flags=fmi->flags;
+ v->mode=VIDEO_MODE_AUTO;
+ v->signal = fmi_getsigstr(fmi);
+ return 0;
+ }
+ case VIDIOCSTUNER:
+ {
+ struct video_tuner *v = arg;
+ if(v->tuner!=0)
+ return -EINVAL;
+ fmi->flags = v->flags & VIDEO_TUNER_LOW;
+ /* Only 1 tuner so no setting needed ! */
+ return 0;
+ }
+ case VIDIOCGFREQ:
+ {
+ unsigned long *freq = arg;
+ *freq = fmi->curfreq;
+ if (!(fmi->flags & VIDEO_TUNER_LOW))
+ *freq /= 1000;
+ return 0;
+ }
+ case VIDIOCSFREQ:
+ {
+ unsigned long *freq = arg;
+ if (!(fmi->flags & VIDEO_TUNER_LOW))
+ *freq *= 1000;
+ if (*freq < RSF16_MINFREQ || *freq > RSF16_MAXFREQ )
+ return -EINVAL;
+ /*rounding in steps of 800 to match th freq
+ that will be used */
+ fmi->curfreq = (*freq/800)*800;
+ fmi_setfreq(fmi);
+ return 0;
+ }
+ case VIDIOCGAUDIO:
+ {
+ struct video_audio *v = arg;
+ memset(v,0,sizeof(*v));
+ v->flags=( (!fmi->curvol)*VIDEO_AUDIO_MUTE | VIDEO_AUDIO_MUTABLE);
+ strcpy(v->name, "Radio");
+ v->mode=VIDEO_SOUND_STEREO;
+ return 0;
+ }
+ case VIDIOCSAUDIO:
+ {
+ struct video_audio *v = arg;
+ if(v->audio)
+ return -EINVAL;
+ fmi->curvol= v->flags&VIDEO_AUDIO_MUTE ? 0 : 1;
+ fmi->curvol ?
+ fmi_unmute(fmi->port) : fmi_mute(fmi->port);
+ return 0;
+ }
+ case VIDIOCGUNIT:
+ {
+ struct video_unit *v = arg;
+ v->video=VIDEO_NO_UNIT;
+ v->vbi=VIDEO_NO_UNIT;
+ v->radio=dev->minor;
+ v->audio=0; /* How do we find out this??? */
+ v->teletext=VIDEO_NO_UNIT;
+ return 0;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static int fmi_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return video_usercopy(inode, file, cmd, arg, fmi_do_ioctl);
+}
+
+static struct fmi_device fmi_unit;
+
+static struct file_operations fmi_fops = {
+ .owner = THIS_MODULE,
+ .open = video_exclusive_open,
+ .release = video_exclusive_release,
+ .ioctl = fmi_ioctl,
+ .llseek = no_llseek,
+};
+
+static struct video_device fmi_radio=
+{
+ .owner = THIS_MODULE,
+ .name = "SF16FMx radio",
+ .type = VID_TYPE_TUNER,
+ .hardware = VID_HARDWARE_SF16MI,
+ .fops = &fmi_fops,
+};
+
+/* ladis: this is my card. does any other types exist? */
+static struct isapnp_device_id id_table[] __devinitdata = {
+ { ISAPNP_ANY_ID, ISAPNP_ANY_ID,
+ ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
+ { ISAPNP_CARD_END, },
+};
+
+MODULE_DEVICE_TABLE(isapnp, id_table);
+
+static int isapnp_fmi_probe(void)
+{
+ int i = 0;
+
+ while (id_table[i].card_vendor != 0 && dev == NULL) {
+ dev = pnp_find_dev(NULL, id_table[i].vendor,
+ id_table[i].function, NULL);
+ i++;
+ }
+
+ if (!dev)
+ return -ENODEV;
+ if (pnp_device_attach(dev) < 0)
+ return -EAGAIN;
+ if (pnp_activate_dev(dev) < 0) {
+ printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
+ pnp_device_detach(dev);
+ return -ENOMEM;
+ }
+ if (!pnp_port_valid(dev, 0)) {
+ pnp_device_detach(dev);
+ return -ENODEV;
+ }
+
+ i = pnp_port_start(dev, 0);
+ printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
+
+ return i;
+}
+
+static int __init fmi_init(void)
+{
+ if (io < 0)
+ io = isapnp_fmi_probe();
+ if (io < 0) {
+ printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
+ return io;
+ }
+ if (!request_region(io, 2, "radio-sf16fmi")) {
+ printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
+ return -EBUSY;
+ }
+
+ fmi_unit.port = io;
+ fmi_unit.curvol = 0;
+ fmi_unit.curfreq = 0;
+ fmi_unit.flags = VIDEO_TUNER_LOW;
+ fmi_radio.priv = &fmi_unit;
+
+ init_MUTEX(&lock);
+
+ if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) {
+ release_region(io, 2);
+ return -EINVAL;
+ }
+
+ printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
+ /* mute card - prevents noisy bootups */
+ fmi_mute(io);
+ return 0;
+}
+
+MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
+MODULE_DESCRIPTION("A driver for the SF16MI radio.");
+MODULE_LICENSE("GPL");
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
+module_param(radio_nr, int, 0);
+
+static void __exit fmi_cleanup_module(void)
+{
+ video_unregister_device(&fmi_radio);
+ release_region(io, 2);
+ if (dev)
+ pnp_device_detach(dev);
+}
+
+module_init(fmi_init);
+module_exit(fmi_cleanup_module);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.