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radio-maxiradio.c

/*
 * Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
 * (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
 *
 * Based in the radio Maestro PCI driver. Actually it uses the same chip
 * for radio but different pci controller.
 *
 * I didn't have any specs I reversed engineered the protocol from
 * the windows driver (radio.dll).
 *
 * The card uses the TEA5757 chip that includes a search function but it
 * is useless as I haven't found any way to read back the frequency. If
 * anybody does please mail me.
 *
 * For the pdf file see:
 * http://www.semiconductors.philips.com/pip/TEA5757H/V1
 *
 *
 * CHANGES:
 *   0.75b
 *     - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
 *
 *   0.75      Sun Feb  4 22:51:27 EET 2001
 *     - tiding up
 *     - removed support for multiple devices as it didn't work anyway
 *
 * BUGS:
 *   - card unmutes if you change frequency
 *
 * (c) 2006, 2007 by Mauro Carvalho Chehab <mchehab@infradead.org>:
 *    - Conversion to V4L2 API
 *      - Uses video_ioctl2 for parsing and to add debug support
 */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/mutex.h>

#include <linux/pci.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>

#define DRIVER_VERSION  "0.77"

#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
#define RADIO_VERSION KERNEL_VERSION(0,7,7)

static struct video_device maxiradio_radio;

#define dprintk(num, fmt, arg...)                                          \
      do {                                                               \
            if (maxiradio_radio.debug >= num)                          \
                  printk(KERN_DEBUG "%s: " fmt,                      \
                        maxiradio_radio.name, ## arg); } while (0)

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,
      }
};

#ifndef PCI_VENDOR_ID_GUILLEMOT
#define PCI_VENDOR_ID_GUILLEMOT 0x5046
#endif

#ifndef PCI_DEVICE_ID_GUILLEMOT
#define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
#endif


/* TEA5757 pin mappings */
static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;

static int radio_nr = -1;
module_param(radio_nr, int, 0);


#define FREQ_LO          50*16000
#define FREQ_HI         150*16000

#define FREQ_IF         171200 /* 10.7*16000   */
#define FREQ_STEP       200    /* 12.5*16      */

/* (x==fmhz*16*1000) -> bits */
#define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1)) \
                  /(FREQ_STEP<<2))<<2)

#define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)


static const struct file_operations maxiradio_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 radio_device
{
      __u16 io,   /* base of radio io */
            muted,      /* VIDEO_AUDIO_MUTE */
            stereo,     /* VIDEO_TUNER_STEREO_ON */
            tuned;      /* signal strength (0 or 0xffff) */

      unsigned long freq;

      struct mutex lock;
} radio_unit = {
      .muted =1,
      .freq = FREQ_LO,
};

static void outbit(unsigned long bit, __u16 io)
{
      if (bit != 0)
            {
                  outb(  power|wren|data     ,io); udelay(4);
                  outb(  power|wren|data|clk ,io); udelay(4);
                  outb(  power|wren|data     ,io); udelay(4);
            }
      else
            {
                  outb(  power|wren          ,io); udelay(4);
                  outb(  power|wren|clk      ,io); udelay(4);
                  outb(  power|wren          ,io); udelay(4);
            }
}

static void turn_power(__u16 io, int p)
{
      if (p != 0) {
            dprintk(1, "Radio powered on\n");
            outb(power, io);
      } else {
            dprintk(1, "Radio powered off\n");
            outb(0,io);
      }
}

static void set_freq(__u16 io, __u32 freq)
{
      unsigned long int si;
      int bl;
      int data = FREQ2BITS(freq);

      /* TEA5757 shift register bits (see pdf) */

      outbit(0,io); // 24  search
      outbit(1,io); // 23  search up/down

      outbit(0,io); // 22  stereo/mono

      outbit(0,io); // 21  band
      outbit(0,io); // 20  band (only 00=FM works I think)

      outbit(0,io); // 19  port ?
      outbit(0,io); // 18  port ?

      outbit(0,io); // 17  search level
      outbit(0,io); // 16  search level

      si = 0x8000;
      for (bl = 1; bl <= 16 ; bl++) {
            outbit(data & si,io);
            si >>=1;
      }

      dprintk(1, "Radio freq set to %d.%02d MHz\n",
                        freq / 16000,
                        freq % 16000 * 100 / 16000);

      turn_power(io, 1);
}

static int get_stereo(__u16 io)
{
      outb(power,io);
      udelay(4);

      return !(inb(io) & mo_st);
}

static int get_tune(__u16 io)
{
      outb(power+clk,io);
      udelay(4);

      return !(inb(io) & mo_st);
}


static int vidioc_querycap (struct file *file, void  *priv,
                      struct v4l2_capability *v)
{
      strlcpy(v->driver, "radio-maxiradio", sizeof (v->driver));
      strlcpy(v->card, "Maxi Radio FM2000 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)
{
      struct video_device *dev = video_devdata(file);
      struct radio_device *card=dev->priv;

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

      memset(v,0,sizeof(*v));
      strcpy(v->name, "FM");
      v->type = V4L2_TUNER_RADIO;

      v->rangelow=FREQ_LO;
      v->rangehigh=FREQ_HI;
      v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
      v->capability=V4L2_TUNER_CAP_LOW;
      if(get_stereo(card->io))
            v->audmode = V4L2_TUNER_MODE_STEREO;
      else
            v->audmode = V4L2_TUNER_MODE_MONO;
      v->signal=0xffff*get_tune(card->io);

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

      strcpy(a->name, "FM");
      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 int vidioc_s_frequency (struct file *file, void *priv,
                         struct v4l2_frequency *f)
{
      struct video_device *dev = video_devdata(file);
      struct radio_device *card=dev->priv;

      if (f->frequency < FREQ_LO || f->frequency > FREQ_HI) {
            dprintk(1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
                              f->frequency / 16000,
                              f->frequency % 16000 * 100 / 16000,
                              FREQ_LO / 16000, FREQ_HI / 16000);

            return -EINVAL;
      }

      card->freq = f->frequency;
      set_freq(card->io, card->freq);
      msleep(125);

      return 0;
}

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

      f->type = V4L2_TUNER_RADIO;
      f->frequency = card->freq;

      dprintk(4, "radio freq is %d.%02d MHz",
                        f->frequency / 16000,
                        f->frequency % 16000 * 100 / 16000);

      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 radio_device *card=dev->priv;

      switch (ctrl->id) {
            case V4L2_CID_AUDIO_MUTE:
                  ctrl->value=card->muted;
                  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 radio_device *card=dev->priv;

      switch (ctrl->id) {
            case V4L2_CID_AUDIO_MUTE:
                  card->muted = ctrl->value;
                  if(card->muted)
                        turn_power(card->io, 0);
                  else
                        set_freq(card->io, card->freq);
                  return 0;
      }

      return -EINVAL;
}

static struct video_device maxiradio_radio =
{
      .owner                = THIS_MODULE,
      .name           = "Maxi Radio FM2000 radio",
      .type           = VID_TYPE_TUNER,
      .fops               = &maxiradio_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 __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
      if(!request_region(pci_resource_start(pdev, 0),
                     pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
            printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
            goto err_out;
      }

      if (pci_enable_device(pdev))
            goto err_out_free_region;

      radio_unit.io = pci_resource_start(pdev, 0);
      mutex_init(&radio_unit.lock);
      maxiradio_radio.priv = &radio_unit;

      if (video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
            printk("radio-maxiradio: can't register device!");
            goto err_out_free_region;
      }

      printk(KERN_INFO "radio-maxiradio: version "
             DRIVER_VERSION
             " time "
             __TIME__ "  "
             __DATE__
             "\n");

      printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
             radio_unit.io);
      return 0;

err_out_free_region:
      release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
err_out:
      return -ENODEV;
}

static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
{
      video_unregister_device(&maxiradio_radio);
      release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
}

static struct pci_device_id maxiradio_pci_tbl[] = {
      { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
            PCI_ANY_ID, PCI_ANY_ID, },
      { 0,}
};

MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);

static struct pci_driver maxiradio_driver = {
      .name       = "radio-maxiradio",
      .id_table   = maxiradio_pci_tbl,
      .probe            = maxiradio_init_one,
      .remove           = __devexit_p(maxiradio_remove_one),
};

static int __init maxiradio_radio_init(void)
{
      return pci_register_driver(&maxiradio_driver);
}

static void __exit maxiradio_radio_exit(void)
{
      pci_unregister_driver(&maxiradio_driver);
}

module_init(maxiradio_radio_init);
module_exit(maxiradio_radio_exit);

MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
MODULE_LICENSE("GPL");

module_param_named(debug,maxiradio_radio.debug, int, 0644);
MODULE_PARM_DESC(debug,"activates debug info");

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