/* Typhoon Radio Card driver for radio support * (c) 1999 Dr. Henrik Seidel * * 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. * * Converted to V4L2 API by Mauro Carvalho Chehab */ #include /* Modules */ #include /* Initdata */ #include /* request_region */ #include /* radio card status report */ #include /* outb, outb_p */ #include /* copy to/from user */ #include /* kernel radio structs */ #include #include /* for KERNEL_VERSION MACRO */ #define RADIO_VERSION KERNEL_VERSION(0,1,1) #define BANNER "Typhoon Radio Card driver v0.1.1\n" static struct v4l2_queryctrl radio_qctrl[] = { { .id = V4L2_CID_AUDIO_MUTE, .name = "Mute", .minimum = 0, .maximum = 1, .default_value = 1, .type = V4L2_CTRL_TYPE_BOOLEAN, },{ .id = V4L2_CID_AUDIO_VOLUME, .name = "Volume", .minimum = 0, .maximum = 65535, .step = 1<<14, .default_value = 0xff, .type = V4L2_CTRL_TYPE_INTEGER, } }; #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 mutex 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) { mutex_lock(&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. */ mutex_unlock(&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. * */ mutex_lock(&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); mutex_unlock(&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 VIDIOC_QUERYCAP: { struct v4l2_capability *v = arg; memset(v,0,sizeof(*v)); strlcpy(v->driver, "radio-typhoon", sizeof (v->driver)); strlcpy(v->card, "Typhoon Radio", sizeof (v->card)); sprintf(v->bus_info,"ISA"); v->version = RADIO_VERSION; v->capabilities = V4L2_CAP_TUNER; return 0; } case VIDIOC_G_TUNER: { struct v4l2_tuner *v = arg; if (v->index > 0) return -EINVAL; memset(v,0,sizeof(*v)); strcpy(v->name, "FM"); v->type = V4L2_TUNER_RADIO; v->rangelow=(87.5*16000); v->rangehigh=(108*16000); v->rxsubchans =V4L2_TUNER_SUB_MONO; v->capability=V4L2_TUNER_CAP_LOW; v->audmode = V4L2_TUNER_MODE_MONO; v->signal = 0xFFFF; /* We can't get the signal strength */ return 0; } case VIDIOC_S_TUNER: { struct v4l2_tuner *v = arg; if (v->index > 0) return -EINVAL; return 0; } case VIDIOC_S_FREQUENCY: { struct v4l2_frequency *f = arg; typhoon->curfreq = f->frequency; typhoon_setfreq(typhoon, typhoon->curfreq); return 0; } case VIDIOC_G_FREQUENCY: { struct v4l2_frequency *f = arg; f->type = V4L2_TUNER_RADIO; f->frequency = typhoon->curfreq; return 0; } case VIDIOC_QUERYCTRL: { struct v4l2_queryctrl *qc = arg; int i; for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { if (qc->id && qc->id == radio_qctrl[i].id) { memcpy(qc, &(radio_qctrl[i]), sizeof(*qc)); return (0); } } return -EINVAL; } case VIDIOC_G_CTRL: { struct v4l2_control *ctrl= arg; switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: ctrl->value=typhoon->muted; return (0); case V4L2_CID_AUDIO_VOLUME: ctrl->value=typhoon->curvol; return (0); } return -EINVAL; } case VIDIOC_S_CTRL: { struct v4l2_control *ctrl= arg; switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: if (ctrl->value) { typhoon_mute(typhoon); } else { typhoon_unmute(typhoon); } return (0); case V4L2_CID_AUDIO_VOLUME: typhoon_setvol(typhoon, ctrl->value); return (0); } return -EINVAL; } default: return v4l_compat_translate_ioctl(inode,file,cmd,arg, typhoon_do_ioctl); } } 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 const struct file_operations typhoon_fops = { .owner = THIS_MODULE, .open = video_exclusive_open, .release = video_exclusive_release, .ioctl = typhoon_ioctl, .compat_ioctl = v4l_compat_ioctl32, .llseek = no_llseek, }; static struct video_device typhoon_radio = { .owner = THIS_MODULE, .name = "Typhoon Radio", .type = VID_TYPE_TUNER, .hardware = 0, .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); mutex_init(&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);