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radio-sf16fmi.c

/* SF16FMI radio driver for Linux radio support
 * heavily based on rtrack driver...
 * (c) 1997 M. Kirkwood
 * (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
 *
 * Fitted to new interface by Alan Cox <alan.cox@linux.org>
 * Made working and cleaned up functions <mikael.hedin@irf.se>
 * Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
 *
 * Notes on the hardware
 *
 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
 *  No volume control - only mute/unmute - you have to use line volume
 *  control on SB-part of SF16FMI
 *
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 */

#include <linux/version.h>
#include <linux/kernel.h>     /* __setup              */
#include <linux/module.h>     /* Modules              */
#include <linux/init.h>       /* Initdata             */
#include <linux/ioport.h>     /* request_region       */
#include <linux/delay.h>      /* udelay               */
#include <linux/videodev2.h>  /* kernel radio structs       */
#include <media/v4l2-common.h>
#include <linux/isapnp.h>
#include <asm/io.h>           /* outb, outb_p               */
#include <asm/uaccess.h>      /* copy to/from user          */
#include <linux/mutex.h>

#define RADIO_VERSION KERNEL_VERSION(0,0,2)

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,
      }
};

struct fmi_device
{
      int port;
      int curvol; /* 1 or 0 */
      unsigned long curfreq; /* freq in kHz */
      __u32 flags;
};

static int io = -1;
static int radio_nr = -1;
static struct pnp_dev *dev = NULL;
static struct mutex lock;

/* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
/* It is only useful to give freq in intervall of 800 (=0.05Mhz),
 * other bits will be truncated, e.g 92.7400016 -> 92.7, but
 * 92.7400017 -> 92.75
 */
#define RSF16_ENCODE(x) ((x)/800+214)
#define RSF16_MINFREQ 87*16000
#define RSF16_MAXFREQ 108*16000

static void outbits(int bits, unsigned int data, int port)
{
      while(bits--) {
            if(data & 1) {
                  outb(5, port);
                  udelay(6);
                  outb(7, port);
                  udelay(6);
            } else {
                  outb(1, port);
                  udelay(6);
                  outb(3, port);
                  udelay(6);
            }
            data>>=1;
      }
}

static inline void fmi_mute(int port)
{
      mutex_lock(&lock);
      outb(0x00, port);
      mutex_unlock(&lock);
}

static inline void fmi_unmute(int port)
{
      mutex_lock(&lock);
      outb(0x08, port);
      mutex_unlock(&lock);
}

static inline int fmi_setfreq(struct fmi_device *dev)
{
      int myport = dev->port;
      unsigned long freq = dev->curfreq;

      mutex_lock(&lock);

      outbits(16, RSF16_ENCODE(freq), myport);
      outbits(8, 0xC0, myport);
      msleep(143);            /* was schedule_timeout(HZ/7) */
      mutex_unlock(&lock);
      if (dev->curvol) fmi_unmute(myport);
      return 0;
}

static inline int fmi_getsigstr(struct fmi_device *dev)
{
      int val;
      int res;
      int myport = dev->port;


      mutex_lock(&lock);
      val = dev->curvol ? 0x08 : 0x00;    /* unmute/mute */
      outb(val, myport);
      outb(val | 0x10, myport);
      msleep(143);            /* was schedule_timeout(HZ/7) */
      res = (int)inb(myport+1);
      outb(val, myport);

      mutex_unlock(&lock);
      return (res & 2) ? 0 : 0xFFFF;
}

static int vidioc_querycap(struct file *file, void  *priv,
                              struct v4l2_capability *v)
{
      strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
      strlcpy(v->card, "SF16-FMx radio", 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)
{
      int mult;
      struct video_device *dev = video_devdata(file);
      struct fmi_device *fmi = dev->priv;

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

      strcpy(v->name, "FM");
      v->type = V4L2_TUNER_RADIO;
      mult = (fmi->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
      v->rangelow = RSF16_MINFREQ/mult;
      v->rangehigh = RSF16_MAXFREQ/mult;
      v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
      v->capability = fmi->flags&V4L2_TUNER_CAP_LOW;
      v->audmode = V4L2_TUNER_MODE_STEREO;
      v->signal = fmi_getsigstr(fmi);
      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 fmi_device *fmi = dev->priv;

      if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
            f->frequency *= 1000;
      if (f->frequency < RSF16_MINFREQ ||
                  f->frequency > RSF16_MAXFREQ )
            return -EINVAL;
      /*rounding in steps of 800 to match th freq
      that will be used */
      fmi->curfreq = (f->frequency/800)*800;
      fmi_setfreq(fmi);
      return 0;
}

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

      f->type = V4L2_TUNER_RADIO;
      f->frequency = fmi->curfreq;
      if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
            f->frequency /= 1000;
      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 fmi_device *fmi = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            ctrl->value = fmi->curvol;
            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 fmi_device *fmi = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (ctrl->value)
                  fmi_mute(fmi->port);
            else
                  fmi_unmute(fmi->port);
            fmi->curvol = 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 fmi_device fmi_unit;

static const struct file_operations fmi_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 fmi_radio=
{
      .owner            = THIS_MODULE,
      .name       = "SF16FMx radio",
      .type       = VID_TYPE_TUNER,
      .fops           = &fmi_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,
};

/* ladis: this is my card. does any other types exist? */
static struct isapnp_device_id id_table[] __devinitdata = {
      {     ISAPNP_ANY_ID, ISAPNP_ANY_ID,
            ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
      {     ISAPNP_CARD_END, },
};

MODULE_DEVICE_TABLE(isapnp, id_table);

static int isapnp_fmi_probe(void)
{
      int i = 0;

      while (id_table[i].card_vendor != 0 && dev == NULL) {
            dev = pnp_find_dev(NULL, id_table[i].vendor,
                           id_table[i].function, NULL);
            i++;
      }

      if (!dev)
            return -ENODEV;
      if (pnp_device_attach(dev) < 0)
            return -EAGAIN;
      if (pnp_activate_dev(dev) < 0) {
            printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
            pnp_device_detach(dev);
            return -ENOMEM;
      }
      if (!pnp_port_valid(dev, 0)) {
            pnp_device_detach(dev);
            return -ENODEV;
      }

      i = pnp_port_start(dev, 0);
      printk ("radio-sf16fmi: PnP reports card at %#x\n", i);

      return i;
}

static int __init fmi_init(void)
{
      if (io < 0)
            io = isapnp_fmi_probe();
      if (io < 0) {
            printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
            return io;
      }
      if (!request_region(io, 2, "radio-sf16fmi")) {
            printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
            return -EBUSY;
      }

      fmi_unit.port = io;
      fmi_unit.curvol = 0;
      fmi_unit.curfreq = 0;
      fmi_unit.flags = V4L2_TUNER_CAP_LOW;
      fmi_radio.priv = &fmi_unit;

      mutex_init(&lock);

      if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) {
            release_region(io, 2);
            return -EINVAL;
      }

      printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
      /* mute card - prevents noisy bootups */
      fmi_mute(io);
      return 0;
}

MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
MODULE_DESCRIPTION("A driver for the SF16MI radio.");
MODULE_LICENSE("GPL");

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
module_param(radio_nr, int, 0);

static void __exit fmi_cleanup_module(void)
{
      video_unregister_device(&fmi_radio);
      release_region(io, 2);
      if (dev)
            pnp_device_detach(dev);
}

module_init(fmi_init);
module_exit(fmi_cleanup_module);

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