408 lines
11 KiB
C
408 lines
11 KiB
C
/* Typhoon Radio Card driver for radio support
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* (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
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*
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* Notes on the hardware
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*
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* This card has two output sockets, one for speakers and one for line.
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* The speaker output has volume control, but only in four discrete
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* steps. The line output has neither volume control nor mute.
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*
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* The card has auto-stereo according to its manual, although it all
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* sounds mono to me (even with the Win/DOS drivers). Maybe it's my
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* antenna - I really don't know for sure.
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*
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* Frequency control is done digitally.
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*
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* Volume control is done digitally, but there are only four different
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* possible values. So you should better always turn the volume up and
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* use line control. I got the best results by connecting line output
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* to the sound card microphone input. For such a configuration the
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* volume control has no effect, since volume control only influences
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* the speaker output.
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*
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* There is no explicit mute/unmute. So I set the radio frequency to a
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* value where I do expect just noise and turn the speaker volume down.
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* The frequency change is necessary since the card never seems to be
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* completely silent.
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*
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* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
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*/
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#include <linux/module.h> /* Modules */
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#include <linux/init.h> /* Initdata */
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#include <linux/ioport.h> /* request_region */
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#include <linux/version.h> /* for KERNEL_VERSION MACRO */
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#include <linux/videodev2.h> /* kernel radio structs */
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#include <linux/io.h> /* outb, outb_p */
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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MODULE_AUTHOR("Dr. Henrik Seidel");
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MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
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MODULE_LICENSE("GPL");
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#ifndef CONFIG_RADIO_TYPHOON_PORT
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#define CONFIG_RADIO_TYPHOON_PORT -1
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#endif
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#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
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#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
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#endif
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static int io = CONFIG_RADIO_TYPHOON_PORT;
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static int radio_nr = -1;
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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
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module_param(radio_nr, int, 0);
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static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ;
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module_param(mutefreq, ulong, 0);
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MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
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#define RADIO_VERSION KERNEL_VERSION(0, 1, 1)
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#define BANNER "Typhoon Radio Card driver v0.1.1\n"
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struct typhoon {
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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int io;
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int curvol;
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int muted;
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unsigned long curfreq;
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unsigned long mutefreq;
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struct mutex lock;
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};
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static struct typhoon typhoon_card;
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static void typhoon_setvol_generic(struct typhoon *dev, int vol)
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{
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mutex_lock(&dev->lock);
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vol >>= 14; /* Map 16 bit to 2 bit */
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vol &= 3;
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outb_p(vol / 2, dev->io); /* Set the volume, high bit. */
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outb_p(vol % 2, dev->io + 2); /* Set the volume, low bit. */
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mutex_unlock(&dev->lock);
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}
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static int typhoon_setfreq_generic(struct typhoon *dev,
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unsigned long frequency)
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{
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unsigned long outval;
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unsigned long x;
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/*
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* The frequency transfer curve is not linear. The best fit I could
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* get is
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*
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* outval = -155 + exp((f + 15.55) * 0.057))
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*
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* where frequency f is in MHz. Since we don't have exp in the kernel,
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* I approximate this function by a third order polynomial.
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*
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*/
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mutex_lock(&dev->lock);
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x = frequency / 160;
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outval = (x * x + 2500) / 5000;
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outval = (outval * x + 5000) / 10000;
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outval -= (10 * x * x + 10433) / 20866;
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outval += 4 * x - 11505;
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outb_p((outval >> 8) & 0x01, dev->io + 4);
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outb_p(outval >> 9, dev->io + 6);
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outb_p(outval & 0xff, dev->io + 8);
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mutex_unlock(&dev->lock);
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return 0;
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}
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static int typhoon_setfreq(struct typhoon *dev, unsigned long frequency)
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{
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typhoon_setfreq_generic(dev, frequency);
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dev->curfreq = frequency;
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return 0;
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}
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static void typhoon_mute(struct typhoon *dev)
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{
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if (dev->muted == 1)
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return;
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typhoon_setvol_generic(dev, 0);
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typhoon_setfreq_generic(dev, dev->mutefreq);
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dev->muted = 1;
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}
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static void typhoon_unmute(struct typhoon *dev)
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{
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if (dev->muted == 0)
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return;
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typhoon_setfreq_generic(dev, dev->curfreq);
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typhoon_setvol_generic(dev, dev->curvol);
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dev->muted = 0;
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}
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static int typhoon_setvol(struct typhoon *dev, int vol)
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{
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if (dev->muted && vol != 0) { /* user is unmuting the card */
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dev->curvol = vol;
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typhoon_unmute(dev);
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return 0;
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}
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if (vol == dev->curvol) /* requested volume == current */
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return 0;
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if (vol == 0) { /* volume == 0 means mute the card */
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typhoon_mute(dev);
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dev->curvol = vol;
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return 0;
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}
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typhoon_setvol_generic(dev, vol);
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dev->curvol = vol;
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return 0;
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}
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
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strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
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strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
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v->version = RADIO_VERSION;
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v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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if (v->index > 0)
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return -EINVAL;
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strlcpy(v->name, "FM", sizeof(v->name));
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v->type = V4L2_TUNER_RADIO;
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v->rangelow = 87.5 * 16000;
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v->rangehigh = 108 * 16000;
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v->rxsubchans = V4L2_TUNER_SUB_MONO;
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v->capability = V4L2_TUNER_CAP_LOW;
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v->audmode = V4L2_TUNER_MODE_MONO;
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v->signal = 0xFFFF; /* We can't get the signal strength */
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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return v->index ? -EINVAL : 0;
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct typhoon *dev = video_drvdata(file);
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if (f->tuner != 0)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = dev->curfreq;
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return 0;
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct typhoon *dev = video_drvdata(file);
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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dev->curfreq = f->frequency;
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typhoon_setfreq(dev, dev->curfreq);
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return 0;
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}
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static int vidioc_queryctrl(struct file *file, void *priv,
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struct v4l2_queryctrl *qc)
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{
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switch (qc->id) {
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case V4L2_CID_AUDIO_MUTE:
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return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
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case V4L2_CID_AUDIO_VOLUME:
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return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535);
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}
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return -EINVAL;
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}
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static int vidioc_g_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct typhoon *dev = video_drvdata(file);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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ctrl->value = dev->muted;
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return 0;
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case V4L2_CID_AUDIO_VOLUME:
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ctrl->value = dev->curvol;
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return 0;
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}
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return -EINVAL;
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}
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static int vidioc_s_ctrl (struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct typhoon *dev = video_drvdata(file);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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if (ctrl->value)
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typhoon_mute(dev);
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else
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typhoon_unmute(dev);
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return 0;
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case V4L2_CID_AUDIO_VOLUME:
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typhoon_setvol(dev, ctrl->value);
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return 0;
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}
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return -EINVAL;
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}
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static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
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{
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*i = 0;
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return 0;
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}
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static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
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{
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return i ? -EINVAL : 0;
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}
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static int vidioc_g_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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a->index = 0;
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strlcpy(a->name, "Radio", sizeof(a->name));
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a->capability = V4L2_AUDCAP_STEREO;
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return 0;
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}
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static int vidioc_s_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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return a->index ? -EINVAL : 0;
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}
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static int vidioc_log_status(struct file *file, void *priv)
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{
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struct typhoon *dev = video_drvdata(file);
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struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
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v4l2_info(v4l2_dev, BANNER);
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#ifdef MODULE
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v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n");
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#else
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v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n");
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#endif
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v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4);
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v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol);
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v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ? "on" : "off");
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v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io);
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v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4);
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return 0;
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}
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static const struct v4l2_file_operations typhoon_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = video_ioctl2,
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};
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static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
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.vidioc_log_status = vidioc_log_status,
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_tuner = vidioc_g_tuner,
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.vidioc_s_tuner = vidioc_s_tuner,
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.vidioc_g_audio = vidioc_g_audio,
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.vidioc_s_audio = vidioc_s_audio,
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.vidioc_g_input = vidioc_g_input,
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.vidioc_s_input = vidioc_s_input,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_queryctrl = vidioc_queryctrl,
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.vidioc_g_ctrl = vidioc_g_ctrl,
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.vidioc_s_ctrl = vidioc_s_ctrl,
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};
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static int __init typhoon_init(void)
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{
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struct typhoon *dev = &typhoon_card;
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struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
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int res;
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strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name));
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dev->io = io;
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if (dev->io == -1) {
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v4l2_err(v4l2_dev, "You must set an I/O address with io=0x316 or io=0x336\n");
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return -EINVAL;
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}
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if (mutefreq < 87000 || mutefreq > 108500) {
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v4l2_err(v4l2_dev, "You must set a frequency (in kHz) used when muting the card,\n");
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v4l2_err(v4l2_dev, "e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
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return -EINVAL;
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}
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dev->curfreq = dev->mutefreq = mutefreq << 4;
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mutex_init(&dev->lock);
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if (!request_region(dev->io, 8, "typhoon")) {
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v4l2_err(v4l2_dev, "port 0x%x already in use\n",
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dev->io);
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return -EBUSY;
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}
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res = v4l2_device_register(NULL, v4l2_dev);
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if (res < 0) {
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release_region(dev->io, 8);
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v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
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return res;
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}
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v4l2_info(v4l2_dev, BANNER);
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strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
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dev->vdev.v4l2_dev = v4l2_dev;
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dev->vdev.fops = &typhoon_fops;
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dev->vdev.ioctl_ops = &typhoon_ioctl_ops;
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dev->vdev.release = video_device_release_empty;
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video_set_drvdata(&dev->vdev, dev);
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/* mute card - prevents noisy bootups */
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typhoon_mute(dev);
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if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
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v4l2_device_unregister(&dev->v4l2_dev);
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release_region(dev->io, 8);
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return -EINVAL;
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}
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v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io);
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v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", mutefreq);
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return 0;
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}
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static void __exit typhoon_exit(void)
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{
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struct typhoon *dev = &typhoon_card;
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video_unregister_device(&dev->vdev);
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v4l2_device_unregister(&dev->v4l2_dev);
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release_region(dev->io, 8);
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}
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module_init(typhoon_init);
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module_exit(typhoon_exit);
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