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radio-aimslab.c

/* radiotrack (radioreveal) driver for Linux radio support
 * (c) 1997 M. Kirkwood
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 * Converted to new API by Alan Cox <Alan.Cox@linux.org>
 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
 *
 * History:
 * 1999-02-24     Russell Kroll <rkroll@exploits.org>
 *          Fine tuning/VIDEO_TUNER_LOW
 *          Frequency range expanded to start at 87 MHz
 *
 * TODO: Allow for more than one of these foolish entities :-)
 *
 * Notes on the hardware (reverse engineered from other peoples'
 * reverse engineering of AIMS' code :-)
 *
 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
 *
 *  The signal strength query is unsurprisingly inaccurate.  And it seems
 *  to indicate that (on my card, at least) the frequency setting isn't
 *  too great.  (I have to tune up .025MHz from what the freq should be
 *  to get a report that the thing is tuned.)
 *
 *  Volume control is (ugh) analogue:
 *   out(port, start_increasing_volume);
 *   wait(a_wee_while);
 *   out(port, stop_changing_the_volume);
 *
 */

#include <linux/module.h>     /* Modules              */
#include <linux/init.h>       /* Initdata             */
#include <linux/ioport.h>     /* request_region       */
#include <linux/delay.h>      /* udelay               */
#include <asm/io.h>           /* outb, outb_p               */
#include <asm/uaccess.h>      /* copy to/from user          */
#include <linux/videodev2.h>  /* kernel radio structs       */
#include <media/v4l2-common.h>
#include <asm/semaphore.h>    /* Lock for the I/O           */

#include <linux/version.h>    /* for KERNEL_VERSION MACRO   */
#define RADIO_VERSION KERNEL_VERSION(0,0,2)

#ifndef CONFIG_RADIO_RTRACK_PORT
#define CONFIG_RADIO_RTRACK_PORT -1
#endif

static int io = CONFIG_RADIO_RTRACK_PORT;
static int radio_nr = -1;
static struct mutex lock;

struct rt_device
{
      int port;
      int curvol;
      unsigned long curfreq;
      int muted;
};


/* local things */

static void sleep_delay(long n)
{
      /* Sleep nicely for 'n' uS */
      int d=n/msecs_to_jiffies(1000);
      if(!d)
            udelay(n);
      else
            msleep(jiffies_to_msecs(d));
}

static void rt_decvol(void)
{
      outb(0x58, io);         /* volume down + sigstr + on  */
      sleep_delay(100000);
      outb(0xd8, io);         /* volume steady + sigstr + on      */
}

static void rt_incvol(void)
{
      outb(0x98, io);         /* volume up + sigstr + on    */
      sleep_delay(100000);
      outb(0xd8, io);         /* volume steady + sigstr + on      */
}

static void rt_mute(struct rt_device *dev)
{
      dev->muted = 1;
      mutex_lock(&lock);
      outb(0xd0, io);               /* volume steady, off         */
      mutex_unlock(&lock);
}

static int rt_setvol(struct rt_device *dev, int vol)
{
      int i;

      mutex_lock(&lock);

      if(vol == dev->curvol) {      /* requested volume = current */
            if (dev->muted) { /* user is unmuting the card  */
                  dev->muted = 0;
                  outb (0xd8, io);  /* enable card */
            }
            mutex_unlock(&lock);
            return 0;
      }

      if(vol == 0) {                /* volume = 0 means mute the card */
            outb(0x48, io);         /* volume down but still "on" */
            sleep_delay(2000000);   /* make sure it's totally down      */
            outb(0xd0, io);         /* volume steady, off         */
            dev->curvol = 0;  /* track the volume state!    */
            mutex_unlock(&lock);
            return 0;
      }

      dev->muted = 0;
      if(vol > dev->curvol)
            for(i = dev->curvol; i < vol; i++)
                  rt_incvol();
      else
            for(i = dev->curvol; i > vol; i--)
                  rt_decvol();

      dev->curvol = vol;
      mutex_unlock(&lock);
      return 0;
}

/* the 128+64 on these outb's is to keep the volume stable while tuning
 * without them, the volume _will_ creep up with each frequency change
 * and bit 4 (+16) is to keep the signal strength meter enabled
 */

static void send_0_byte(int port, struct rt_device *dev)
{
      if ((dev->curvol == 0) || (dev->muted)) {
            outb_p(128+64+16+  1, port);   /* wr-enable + data low */
            outb_p(128+64+16+2+1, port);   /* clock */
      }
      else {
            outb_p(128+64+16+8+  1, port);  /* on + wr-enable + data low */
            outb_p(128+64+16+8+2+1, port);  /* clock */
      }
      sleep_delay(1000);
}

static void send_1_byte(int port, struct rt_device *dev)
{
      if ((dev->curvol == 0) || (dev->muted)) {
            outb_p(128+64+16+4  +1, port);   /* wr-enable+data high */
            outb_p(128+64+16+4+2+1, port);   /* clock */
      }
      else {
            outb_p(128+64+16+8+4  +1, port); /* on+wr-enable+data high */
            outb_p(128+64+16+8+4+2+1, port); /* clock */
      }

      sleep_delay(1000);
}

static int rt_setfreq(struct rt_device *dev, unsigned long freq)
{
      int i;

      /* adapted from radio-aztech.c */

      /* now uses VIDEO_TUNER_LOW for fine tuning */

      freq += 171200;               /* Add 10.7 MHz IF            */
      freq /= 800;                  /* Convert to 50 kHz units    */

      mutex_lock(&lock);                  /* Stop other ops interfering */

      send_0_byte (io, dev);        /*  0: LSB of frequency       */

      for (i = 0; i < 13; i++)      /*   : frequency bits (1-13)  */
            if (freq & (1 << i))
                  send_1_byte (io, dev);
            else
                  send_0_byte (io, dev);

      send_0_byte (io, dev);        /* 14: test bit - always 0    */
      send_0_byte (io, dev);        /* 15: test bit - always 0    */

      send_0_byte (io, dev);        /* 16: band data 0 - always 0 */
      send_0_byte (io, dev);        /* 17: band data 1 - always 0 */
      send_0_byte (io, dev);        /* 18: band data 2 - always 0 */
      send_0_byte (io, dev);        /* 19: time base - always 0   */

      send_0_byte (io, dev);        /* 20: spacing (0 = 25 kHz)   */
      send_1_byte (io, dev);        /* 21: spacing (1 = 25 kHz)   */
      send_0_byte (io, dev);        /* 22: spacing (0 = 25 kHz)   */
      send_1_byte (io, dev);        /* 23: AM/FM (FM = 1, always) */

      if ((dev->curvol == 0) || (dev->muted))
            outb (0xd0, io);  /* volume steady + sigstr */
      else
            outb (0xd8, io);  /* volume steady + sigstr + on */

      mutex_unlock(&lock);

      return 0;
}

static int rt_getsigstr(struct rt_device *dev)
{
      if (inb(io) & 2)  /* bit set = no signal present      */
            return 0;
      return 1;         /* signal present       */
}

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       = 0xff,
            .step          = 1,
            .default_value = 0xff,
            .type          = V4L2_CTRL_TYPE_INTEGER,
      }
};

static int vidioc_querycap(struct file *file, void  *priv,
                              struct v4l2_capability *v)
{
      strlcpy(v->driver, "radio-aimslab", sizeof(v->driver));
      strlcpy(v->card, "RadioTrack", sizeof(v->card));
      sprintf(v->bus_info, "ISA");
      v->version = RADIO_VERSION;
      v->capabilities = V4L2_CAP_TUNER;
      return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
                              struct v4l2_tuner *v)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      if (v->index > 0)
            return -EINVAL;

      strcpy(v->name, "FM");
      v->type = V4L2_TUNER_RADIO;
      v->rangelow = (87*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*rt_getsigstr(rt);
      return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
                              struct v4l2_tuner *v)
{
      if (v->index > 0)
            return -EINVAL;
      return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
                              struct v4l2_frequency *f)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      rt->curfreq = f->frequency;
      rt_setfreq(rt, rt->curfreq);
      return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
                              struct v4l2_frequency *f)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      f->type = V4L2_TUNER_RADIO;
      f->frequency = rt->curfreq;
      return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
                              struct v4l2_queryctrl *qc)
{
      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;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
                              struct v4l2_control *ctrl)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            ctrl->value = rt->muted;
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            ctrl->value = rt->curvol * 6554;
            return 0;
      }
      return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
                              struct v4l2_control *ctrl)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (ctrl->value)
                  rt_mute(rt);
            else
                  rt_setvol(rt,rt->curvol);
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            rt_setvol(rt,ctrl->value);
            return 0;
      }
      return -EINVAL;
}

static int vidioc_g_audio (struct file *file, void *priv,
                              struct v4l2_audio *a)
{
      if (a->index > 1)
            return -EINVAL;

      strcpy(a->name, "Radio");
      a->capability = V4L2_AUDCAP_STEREO;
      return 0;
}

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)
{
      if (i != 0)
            return -EINVAL;
      return 0;
}

static int vidioc_s_audio(struct file *file, void *priv,
                              struct v4l2_audio *a)
{
      if (a->index != 0)
            return -EINVAL;
      return 0;
}

static struct rt_device rtrack_unit;

static const struct file_operations rtrack_fops = {
      .owner            = THIS_MODULE,
      .open           = video_exclusive_open,
      .release        = video_exclusive_release,
      .ioctl            = video_ioctl2,
      .compat_ioctl     = v4l_compat_ioctl32,
      .llseek         = no_llseek,
};

static struct video_device rtrack_radio=
{
      .owner            = THIS_MODULE,
      .name       = "RadioTrack radio",
      .type       = VID_TYPE_TUNER,
      .fops           = &rtrack_fops,
      .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 rtrack_init(void)
{
      if(io==-1)
      {
            printk(KERN_ERR "You must set an I/O address with io=0x???\n");
            return -EINVAL;
      }

      if (!request_region(io, 2, "rtrack"))
      {
            printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
            return -EBUSY;
      }

      rtrack_radio.priv=&rtrack_unit;

      if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
      {
            release_region(io, 2);
            return -EINVAL;
      }
      printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");

      /* Set up the I/O locking */

      mutex_init(&lock);

      /* mute card - prevents noisy bootups */

      /* this ensures that the volume is all the way down  */
      outb(0x48, io);         /* volume down but still "on" */
      sleep_delay(2000000);   /* make sure it's totally down      */
      outb(0xc0, io);         /* steady volume, mute card   */
      rtrack_unit.curvol = 0;

      return 0;
}

MODULE_AUTHOR("M.Kirkwood");
MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
MODULE_LICENSE("GPL");

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
module_param(radio_nr, int, 0);

static void __exit cleanup_rtrack_module(void)
{
      video_unregister_device(&rtrack_radio);
      release_region(io,2);
}

module_init(rtrack_init);
module_exit(cleanup_rtrack_module);


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