/* Typhoon Radio Card driver for radio support * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de> * * 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 <mchehab@infradead.org> */ #include <linux/module.h> /* Modules */ #include <linux/init.h> /* Initdata */ #include <linux/ioport.h> /* request_region */ #include <linux/videodev2.h> /* kernel radio structs */ #include <linux/io.h> /* outb, outb_p */ #include <media/v4l2-device.h> #include <media/v4l2-ioctl.h> #define DRIVER_VERSION "0.1.2" MODULE_AUTHOR("Dr. Henrik Seidel"); MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); MODULE_LICENSE("GPL"); MODULE_VERSION(DRIVER_VERSION); #ifndef CONFIG_RADIO_TYPHOON_PORT #define CONFIG_RADIO_TYPHOON_PORT -1 #endif #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 #endif static int io = CONFIG_RADIO_TYPHOON_PORT; 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); static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ; module_param(mutefreq, ulong, 0); MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); #define BANNER "Typhoon Radio Card driver v" DRIVER_VERSION "\n" struct typhoon { struct v4l2_device v4l2_dev; struct video_device vdev; int io; int curvol; int muted; unsigned long curfreq; unsigned long mutefreq; struct mutex lock; }; static struct typhoon typhoon_card; static void typhoon_setvol_generic(struct typhoon *dev, int vol) { mutex_lock(&dev->lock); vol >>= 14; /* Map 16 bit to 2 bit */ vol &= 3; outb_p(vol / 2, dev->io); /* Set the volume, high bit. */ outb_p(vol % 2, dev->io + 2); /* Set the volume, low bit. */ mutex_unlock(&dev->lock); } static int typhoon_setfreq_generic(struct typhoon *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->io + 4); outb_p(outval >> 9, dev->io + 6); outb_p(outval & 0xff, dev->io + 8); mutex_unlock(&dev->lock); return 0; } static int typhoon_setfreq(struct typhoon *dev, unsigned long frequency) { typhoon_setfreq_generic(dev, frequency); dev->curfreq = frequency; return 0; } static void typhoon_mute(struct typhoon *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 *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 *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 vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *v) { strlcpy(v->driver, "radio-typhoon", sizeof(v->driver)); strlcpy(v->card, "Typhoon Radio", sizeof(v->card)); strlcpy(v->bus_info, "ISA", sizeof(v->bus_info)); v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO; return 0; } static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v) { if (v->index > 0) return -EINVAL; strlcpy(v->name, "FM", sizeof(v->name)); 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; } static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v) { return v->index ? -EINVAL : 0; } static int vidioc_g_frequency(struct file *file, void *priv, struct v4l2_frequency *f) { struct typhoon *dev = video_drvdata(file); if (f->tuner != 0) return -EINVAL; f->type = V4L2_TUNER_RADIO; f->frequency = dev->curfreq; return 0; } static int vidioc_s_frequency(struct file *file, void *priv, struct v4l2_frequency *f) { struct typhoon *dev = video_drvdata(file); if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) return -EINVAL; dev->curfreq = f->frequency; typhoon_setfreq(dev, dev->curfreq); return 0; } static int vidioc_queryctrl(struct file *file, void *priv, struct v4l2_queryctrl *qc) { switch (qc->id) { case V4L2_CID_AUDIO_MUTE: return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); case V4L2_CID_AUDIO_VOLUME: return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535); } return -EINVAL; } static int vidioc_g_ctrl(struct file *file, void *priv, struct v4l2_control *ctrl) { struct typhoon *dev = video_drvdata(file); switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: ctrl->value = dev->muted; return 0; case V4L2_CID_AUDIO_VOLUME: ctrl->value = dev->curvol; return 0; } return -EINVAL; } static int vidioc_s_ctrl (struct file *file, void *priv, struct v4l2_control *ctrl) { struct typhoon *dev = video_drvdata(file); switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: if (ctrl->value) typhoon_mute(dev); else typhoon_unmute(dev); return 0; case V4L2_CID_AUDIO_VOLUME: typhoon_setvol(dev, ctrl->value); return 0; } return -EINVAL; } static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) { *i = 0; return 0; } static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) { return i ? -EINVAL : 0; } static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a) { a->index = 0; strlcpy(a->name, "Radio", sizeof(a->name)); a->capability = V4L2_AUDCAP_STEREO; return 0; } static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a) { return a->index ? -EINVAL : 0; } static int vidioc_log_status(struct file *file, void *priv) { struct typhoon *dev = video_drvdata(file); struct v4l2_device *v4l2_dev = &dev->v4l2_dev; v4l2_info(v4l2_dev, BANNER); #ifdef MODULE v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n"); #else v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n"); #endif v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4); v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol); v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ? "on" : "off"); v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io); v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4); return 0; } static const struct v4l2_file_operations typhoon_fops = { .owner = THIS_MODULE, .unlocked_ioctl = video_ioctl2, }; static const struct v4l2_ioctl_ops typhoon_ioctl_ops = { .vidioc_log_status = vidioc_log_status, .vidioc_querycap = vidioc_querycap, .vidioc_g_tuner = vidioc_g_tuner, .vidioc_s_tuner = vidioc_s_tuner, .vidioc_g_audio = vidioc_g_audio, .vidioc_s_audio = vidioc_s_audio, .vidioc_g_input = vidioc_g_input, .vidioc_s_input = vidioc_s_input, .vidioc_g_frequency = vidioc_g_frequency, .vidioc_s_frequency = vidioc_s_frequency, .vidioc_queryctrl = vidioc_queryctrl, .vidioc_g_ctrl = vidioc_g_ctrl, .vidioc_s_ctrl = vidioc_s_ctrl, }; static int __init typhoon_init(void) { struct typhoon *dev = &typhoon_card; struct v4l2_device *v4l2_dev = &dev->v4l2_dev; int res; strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name)); dev->io = io; if (dev->io == -1) { v4l2_err(v4l2_dev, "You must set an I/O address with io=0x316 or io=0x336\n"); return -EINVAL; } if (mutefreq < 87000 || mutefreq > 108500) { v4l2_err(v4l2_dev, "You must set a frequency (in kHz) used when muting the card,\n"); v4l2_err(v4l2_dev, "e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); return -EINVAL; } dev->curfreq = dev->mutefreq = mutefreq << 4; mutex_init(&dev->lock); if (!request_region(dev->io, 8, "typhoon")) { v4l2_err(v4l2_dev, "port 0x%x already in use\n", dev->io); return -EBUSY; } res = v4l2_device_register(NULL, v4l2_dev); if (res < 0) { release_region(dev->io, 8); v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); return res; } v4l2_info(v4l2_dev, BANNER); strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name)); dev->vdev.v4l2_dev = v4l2_dev; dev->vdev.fops = &typhoon_fops; dev->vdev.ioctl_ops = &typhoon_ioctl_ops; dev->vdev.release = video_device_release_empty; video_set_drvdata(&dev->vdev, dev); /* mute card - prevents noisy bootups */ typhoon_mute(dev); if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) { v4l2_device_unregister(&dev->v4l2_dev); release_region(dev->io, 8); return -EINVAL; } v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io); v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", mutefreq); return 0; } static void __exit typhoon_exit(void) { struct typhoon *dev = &typhoon_card; video_unregister_device(&dev->vdev); v4l2_device_unregister(&dev->v4l2_dev); release_region(dev->io, 8); } module_init(typhoon_init); module_exit(typhoon_exit);