diff options
Diffstat (limited to 'drivers/media/radio/radio-typhoon.c')
| -rw-r--r-- | drivers/media/radio/radio-typhoon.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-typhoon.c b/drivers/media/radio/radio-typhoon.c new file mode 100644 index 000000000000..d7da901ebe90 --- /dev/null +++ b/drivers/media/radio/radio-typhoon.c @@ -0,0 +1,383 @@ +/* Typhoon Radio Card driver for radio support + * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de> + * + * Card manufacturer: + * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e + * + * Notes on the hardware + * + * This card has two output sockets, one for speakers and one for line. + * The speaker output has volume control, but only in four discrete + * steps. The line output has neither volume control nor mute. + * + * The card has auto-stereo according to its manual, although it all + * sounds mono to me (even with the Win/DOS drivers). Maybe it's my + * antenna - I really don't know for sure. + * + * Frequency control is done digitally. + * + * Volume control is done digitally, but there are only four different + * possible values. So you should better always turn the volume up and + * use line control. I got the best results by connecting line output + * to the sound card microphone input. For such a configuration the + * volume control has no effect, since volume control only influences + * the speaker output. + * + * There is no explicit mute/unmute. So I set the radio frequency to a + * value where I do expect just noise and turn the speaker volume down. + * The frequency change is necessary since the card never seems to be + * completely silent. + */ + +#include <linux/module.h> /* Modules */ +#include <linux/init.h> /* Initdata */ +#include <linux/ioport.h> /* check_region, request_region */ +#include <linux/proc_fs.h> /* radio card status report */ +#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_TYPHOON_* */ + +#define BANNER "Typhoon Radio Card driver v0.1\n" + +#ifndef CONFIG_RADIO_TYPHOON_PORT +#define CONFIG_RADIO_TYPHOON_PORT -1 +#endif + +#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ +#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 +#endif + +#ifndef CONFIG_PROC_FS +#undef CONFIG_RADIO_TYPHOON_PROC_FS +#endif + +struct typhoon_device { + int users; + int iobase; + int curvol; + int muted; + unsigned long curfreq; + unsigned long mutefreq; + struct semaphore lock; +}; + +static void typhoon_setvol_generic(struct typhoon_device *dev, int vol); +static int typhoon_setfreq_generic(struct typhoon_device *dev, + unsigned long frequency); +static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency); +static void typhoon_mute(struct typhoon_device *dev); +static void typhoon_unmute(struct typhoon_device *dev); +static int typhoon_setvol(struct typhoon_device *dev, int vol); +static int typhoon_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg); +#ifdef CONFIG_RADIO_TYPHOON_PROC_FS +static int typhoon_get_info(char *buf, char **start, off_t offset, int len); +#endif + +static void typhoon_setvol_generic(struct typhoon_device *dev, int vol) +{ + down(&dev->lock); + vol >>= 14; /* Map 16 bit to 2 bit */ + vol &= 3; + outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */ + outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */ + up(&dev->lock); +} + +static int typhoon_setfreq_generic(struct typhoon_device *dev, + unsigned long frequency) +{ + unsigned long outval; + unsigned long x; + + /* + * The frequency transfer curve is not linear. The best fit I could + * get is + * + * outval = -155 + exp((f + 15.55) * 0.057)) + * + * where frequency f is in MHz. Since we don't have exp in the kernel, + * I approximate this function by a third order polynomial. + * + */ + + down(&dev->lock); + x = frequency / 160; + outval = (x * x + 2500) / 5000; + outval = (outval * x + 5000) / 10000; + outval -= (10 * x * x + 10433) / 20866; + outval += 4 * x - 11505; + + outb_p((outval >> 8) & 0x01, dev->iobase + 4); + outb_p(outval >> 9, dev->iobase + 6); + outb_p(outval & 0xff, dev->iobase + 8); + up(&dev->lock); + + return 0; +} + +static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency) +{ + typhoon_setfreq_generic(dev, frequency); + dev->curfreq = frequency; + return 0; +} + +static void typhoon_mute(struct typhoon_device *dev) +{ + if (dev->muted == 1) + return; + typhoon_setvol_generic(dev, 0); + typhoon_setfreq_generic(dev, dev->mutefreq); + dev->muted = 1; +} + +static void typhoon_unmute(struct typhoon_device *dev) +{ + if (dev->muted == 0) + return; + typhoon_setfreq_generic(dev, dev->curfreq); + typhoon_setvol_generic(dev, dev->curvol); + dev->muted = 0; +} + +static int typhoon_setvol(struct typhoon_device *dev, int vol) +{ + if (dev->muted && vol != 0) { /* user is unmuting the card */ + dev->curvol = vol; + typhoon_unmute(dev); + return 0; + } + if (vol == dev->curvol) /* requested volume == current */ + return 0; + + if (vol == 0) { /* volume == 0 means mute the card */ + typhoon_mute(dev); + dev->curvol = vol; + return 0; + } + typhoon_setvol_generic(dev, vol); + dev->curvol = vol; + return 0; +} + + +static int typhoon_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *arg) +{ + struct video_device *dev = video_devdata(file); + struct typhoon_device *typhoon = 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, "Typhoon Radio"); + return 0; + } + case VIDIOCGTUNER: + { + struct video_tuner *v = arg; + if (v->tuner) /* Only 1 tuner */ + return -EINVAL; + v->rangelow = 875 * 1600; + v->rangehigh = 1080 * 1600; + v->flags = VIDEO_TUNER_LOW; + v->mode = VIDEO_MODE_AUTO; + v->signal = 0xFFFF; /* We can't get the signal strength */ + strcpy(v->name, "FM"); + 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 = typhoon->curfreq; + return 0; + } + case VIDIOCSFREQ: + { + unsigned long *freq = arg; + typhoon->curfreq = *freq; + typhoon_setfreq(typhoon, typhoon->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 |= VIDEO_SOUND_MONO; + v->volume = typhoon->curvol; + v->step = 1 << 14; + strcpy(v->name, "Typhoon Radio"); + return 0; + } + case VIDIOCSAUDIO: + { + struct video_audio *v = arg; + if (v->audio) + return -EINVAL; + if (v->flags & VIDEO_AUDIO_MUTE) + typhoon_mute(typhoon); + else + typhoon_unmute(typhoon); + if (v->flags & VIDEO_AUDIO_VOLUME) + typhoon_setvol(typhoon, v->volume); + return 0; + } + default: + return -ENOIOCTLCMD; + } +} + +static int typhoon_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return video_usercopy(inode, file, cmd, arg, typhoon_do_ioctl); +} + +static struct typhoon_device typhoon_unit = +{ + .iobase = CONFIG_RADIO_TYPHOON_PORT, + .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, + .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, +}; + +static struct file_operations typhoon_fops = { + .owner = THIS_MODULE, + .open = video_exclusive_open, + .release = video_exclusive_release, + .ioctl = typhoon_ioctl, + .llseek = no_llseek, +}; + +static struct video_device typhoon_radio = +{ + .owner = THIS_MODULE, + .name = "Typhoon Radio", + .type = VID_TYPE_TUNER, + .hardware = VID_HARDWARE_TYPHOON, + .fops = &typhoon_fops, +}; + +#ifdef CONFIG_RADIO_TYPHOON_PROC_FS + +static int typhoon_get_info(char *buf, char **start, off_t offset, int len) +{ + char *out = buf; + + #ifdef MODULE + #define MODULEPROCSTRING "Driver loaded as a module" + #else + #define MODULEPROCSTRING "Driver compiled into kernel" + #endif + + /* output must be kept under PAGE_SIZE */ + out += sprintf(out, BANNER); + out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n"); + out += sprintf(out, "frequency = %lu kHz\n", + typhoon_unit.curfreq >> 4); + out += sprintf(out, "volume = %d\n", typhoon_unit.curvol); + out += sprintf(out, "mute = %s\n", typhoon_unit.muted ? + "on" : "off"); + out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase); + out += sprintf(out, "mute frequency = %lu kHz\n", + typhoon_unit.mutefreq >> 4); + return out - buf; +} + +#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */ + +MODULE_AUTHOR("Dr. Henrik Seidel"); +MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); +MODULE_LICENSE("GPL"); + +static int io = -1; +static int radio_nr = -1; + +module_param(io, int, 0); +MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); +module_param(radio_nr, int, 0); + +#ifdef MODULE +static unsigned long mutefreq = 0; +module_param(mutefreq, ulong, 0); +MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); +#endif + +static int __init typhoon_init(void) +{ +#ifdef MODULE + if (io == -1) { + printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n"); + return -EINVAL; + } + typhoon_unit.iobase = io; + + if (mutefreq < 87000 || mutefreq > 108500) { + printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n"); + printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); + return -EINVAL; + } + typhoon_unit.mutefreq = mutefreq; +#endif /* MODULE */ + + printk(KERN_INFO BANNER); + init_MUTEX(&typhoon_unit.lock); + io = typhoon_unit.iobase; + if (!request_region(io, 8, "typhoon")) { + printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n", + typhoon_unit.iobase); + return -EBUSY; + } + + typhoon_radio.priv = &typhoon_unit; + if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1) + { + release_region(io, 8); + return -EINVAL; + } + printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase); + printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n", + typhoon_unit.mutefreq); + typhoon_unit.mutefreq <<= 4; + + /* mute card - prevents noisy bootups */ + typhoon_mute(&typhoon_unit); + +#ifdef CONFIG_RADIO_TYPHOON_PROC_FS + if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL, + typhoon_get_info)) + printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n"); +#endif + + return 0; +} + +static void __exit typhoon_cleanup_module(void) +{ + +#ifdef CONFIG_RADIO_TYPHOON_PROC_FS + remove_proc_entry("driver/radio-typhoon", NULL); +#endif + + video_unregister_device(&typhoon_radio); + release_region(io, 8); +} + +module_init(typhoon_init); +module_exit(typhoon_cleanup_module); + |