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radio-trust.c

/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
 * by Eric Lammerts <eric@scintilla.utwente.nl>
 *
 * Based on radio-aztech.c. Original notes:
 *
 * Adapted to support the Video for Linux API by
 * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
 *
 * Quay Ly
 * Donald Song
 * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
 * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
 * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
 *
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 */

#include <stdarg.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>

#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
#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,
      },{
            .id            = V4L2_CID_AUDIO_VOLUME,
            .name          = "Volume",
            .minimum       = 0,
            .maximum       = 65535,
            .step          = 2048,
            .default_value = 65535,
            .type          = V4L2_CTRL_TYPE_INTEGER,
      },{
            .id            = V4L2_CID_AUDIO_BASS,
            .name          = "Bass",
            .minimum       = 0,
            .maximum       = 65535,
            .step          = 4370,
            .default_value = 32768,
            .type          = V4L2_CTRL_TYPE_INTEGER,
      },{
            .id            = V4L2_CID_AUDIO_TREBLE,
            .name          = "Treble",
            .minimum       = 0,
            .maximum       = 65535,
            .step          = 4370,
            .default_value = 32768,
            .type          = V4L2_CTRL_TYPE_INTEGER,
      },
};

/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

#ifndef CONFIG_RADIO_TRUST_PORT
#define CONFIG_RADIO_TRUST_PORT -1
#endif

static int io = CONFIG_RADIO_TRUST_PORT;
static int radio_nr = -1;
static int ioval = 0xf;
static __u16 curvol;
static __u16 curbass;
static __u16 curtreble;
static unsigned long curfreq;
static int curstereo;
static int curmute;

/* i2c addresses */
#define TDA7318_ADDR 0x88
#define TSA6060T_ADDR 0xc4

#define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
#define TR_SET_SCL outb(ioval |= 2, io)
#define TR_CLR_SCL outb(ioval &= 0xfd, io)
#define TR_SET_SDA outb(ioval |= 1, io)
#define TR_CLR_SDA outb(ioval &= 0xfe, io)

static void write_i2c(int n, ...)
{
      unsigned char val, mask;
      va_list args;

      va_start(args, n);

      /* start condition */
      TR_SET_SDA;
      TR_SET_SCL;
      TR_DELAY;
      TR_CLR_SDA;
      TR_CLR_SCL;
      TR_DELAY;

      for(; n; n--) {
            val = va_arg(args, unsigned);
            for(mask = 0x80; mask; mask >>= 1) {
                  if(val & mask)
                        TR_SET_SDA;
                  else
                        TR_CLR_SDA;
                  TR_SET_SCL;
                  TR_DELAY;
                  TR_CLR_SCL;
                  TR_DELAY;
            }
            /* acknowledge bit */
            TR_SET_SDA;
            TR_SET_SCL;
            TR_DELAY;
            TR_CLR_SCL;
            TR_DELAY;
      }

      /* stop condition */
      TR_CLR_SDA;
      TR_DELAY;
      TR_SET_SCL;
      TR_DELAY;
      TR_SET_SDA;
      TR_DELAY;

      va_end(args);
}

static void tr_setvol(__u16 vol)
{
      curvol = vol / 2048;
      write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
}

static int basstreble2chip[15] = {
      0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
};

static void tr_setbass(__u16 bass)
{
      curbass = bass / 4370;
      write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
}

static void tr_settreble(__u16 treble)
{
      curtreble = treble / 4370;
      write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
}

static void tr_setstereo(int stereo)
{
      curstereo = !!stereo;
      ioval = (ioval & 0xfb) | (!curstereo << 2);
      outb(ioval, io);
}

static void tr_setmute(int mute)
{
      curmute = !!mute;
      ioval = (ioval & 0xf7) | (curmute << 3);
      outb(ioval, io);
}

static int tr_getsigstr(void)
{
      int i, v;

      for(i = 0, v = 0; i < 100; i++) v |= inb(io);
      return (v & 1)? 0 : 0xffff;
}

static int tr_getstereo(void)
{
      /* don't know how to determine it, just return the setting */
      return curstereo;
}

static void tr_setfreq(unsigned long f)
{
      f /= 160;   /* Convert to 10 kHz units    */
      f += 1070;  /* Add 10.7 MHz IF                  */

      write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
}

static int vidioc_querycap(struct file *file, void *priv,
                        struct v4l2_capability *v)
{
      strlcpy(v->driver, "radio-trust", sizeof(v->driver));
      strlcpy(v->card, "Trust FM 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)
{
      if (v->index > 0)
            return -EINVAL;

      strcpy(v->name, "FM");
      v->type = V4L2_TUNER_RADIO;
      v->rangelow = (87.5*16000);
      v->rangehigh = (108*16000);
      v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
      v->capability = V4L2_TUNER_CAP_LOW;
      if (tr_getstereo())
            v->audmode = V4L2_TUNER_MODE_STEREO;
      else
            v->audmode = V4L2_TUNER_MODE_MONO;
      v->signal = tr_getsigstr();
      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)
{
      curfreq = f->frequency;
      tr_setfreq(curfreq);
      return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
                        struct v4l2_frequency *f)
{
      f->type = V4L2_TUNER_RADIO;
      f->frequency = 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)
{
      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            ctrl->value = curmute;
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            ctrl->value = curvol * 2048;
            return 0;
      case V4L2_CID_AUDIO_BASS:
            ctrl->value = curbass * 4370;
            return 0;
      case V4L2_CID_AUDIO_TREBLE:
            ctrl->value = curtreble * 4370;
            return 0;
      }
      return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
                        struct v4l2_control *ctrl)
{
      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            tr_setmute(ctrl->value);
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            tr_setvol(ctrl->value);
            return 0;
      case V4L2_CID_AUDIO_BASS:
            tr_setbass(ctrl->value);
            return 0;
      case V4L2_CID_AUDIO_TREBLE:
            tr_settreble(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 const struct file_operations trust_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 trust_radio=
{
      .owner            = THIS_MODULE,
      .name       = "Trust FM Radio",
      .type       = VID_TYPE_TUNER,
      .fops           = &trust_fops,
      .vidioc_querycap    = vidioc_querycap,
      .vidioc_g_tuner     = vidioc_g_tuner,
      .vidioc_s_tuner     = vidioc_s_tuner,
      .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,
      .vidioc_g_audio     = vidioc_g_audio,
      .vidioc_s_audio     = vidioc_s_audio,
      .vidioc_g_input     = vidioc_g_input,
      .vidioc_s_input     = vidioc_s_input,
};

static int __init trust_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, "Trust FM Radio")) {
            printk(KERN_ERR "trust: port 0x%x already in use\n", io);
            return -EBUSY;
      }
      if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
      {
            release_region(io, 2);
            return -EINVAL;
      }

      printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");

      write_i2c(2, TDA7318_ADDR, 0x80);   /* speaker att. LF = 0 dB */
      write_i2c(2, TDA7318_ADDR, 0xa0);   /* speaker att. RF = 0 dB */
      write_i2c(2, TDA7318_ADDR, 0xc0);   /* speaker att. LR = 0 dB */
      write_i2c(2, TDA7318_ADDR, 0xe0);   /* speaker att. RR = 0 dB */
      write_i2c(2, TDA7318_ADDR, 0x40);   /* stereo 1 input, gain = 18.75 dB */

      tr_setvol(0x8000);
      tr_setbass(0x8000);
      tr_settreble(0x8000);
      tr_setstereo(1);

      /* mute card - prevents noisy bootups */
      tr_setmute(1);

      return 0;
}

MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
MODULE_LICENSE("GPL");

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
module_param(radio_nr, int, 0);

static void __exit cleanup_trust_module(void)
{
      video_unregister_device(&trust_radio);
      release_region(io, 2);
}

module_init(trust_init);
module_exit(cleanup_trust_module);

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