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tea575x-tuner.c

/*
 *   ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
 *
 *    Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <asm/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/version.h>
#include <sound/core.h>
#include <sound/tea575x-tuner.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
MODULE_LICENSE("GPL");

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

#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
#define FREQ_LO          (87 * 16000)
#define FREQ_HI         (108 * 16000)

/*
 * definitions
 */

#define TEA575X_BIT_SEARCH    (1<<24)           /* 1 = search action, 0 = tuned */
#define TEA575X_BIT_UPDOWN    (1<<23)           /* 0 = search down, 1 = search up */
#define TEA575X_BIT_MONO      (1<<22)           /* 0 = stereo, 1 = mono */
#define TEA575X_BIT_BAND_MASK (3<<20)
#define TEA575X_BIT_BAND_FM   (0<<20)
#define TEA575X_BIT_BAND_MW   (1<<20)
#define TEA575X_BIT_BAND_LW   (1<<21)
#define TEA575X_BIT_BAND_SW   (1<<22)
#define TEA575X_BIT_PORT_0    (1<<19)           /* user bit */
#define TEA575X_BIT_PORT_1    (1<<18)           /* user bit */
#define TEA575X_BIT_SEARCH_MASK     (3<<16)           /* search level */
#define TEA575X_BIT_SEARCH_5_28          (0<<16)      /* FM >5uV, AM >28uV */
#define TEA575X_BIT_SEARCH_10_40     (1<<16)    /* FM >10uV, AM > 40uV */
#define TEA575X_BIT_SEARCH_30_63     (2<<16)    /* FM >30uV, AM > 63uV */
#define TEA575X_BIT_SEARCH_150_1000  (3<<16)    /* FM > 150uV, AM > 1000uV */
#define TEA575X_BIT_DUMMY     (1<<15)           /* buffer */
#define TEA575X_BIT_FREQ_MASK 0x7fff

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,
      }
};

/*
 * lowlevel part
 */

static void snd_tea575x_set_freq(struct snd_tea575x *tea)
{
      unsigned long freq;

      freq = tea->freq / 16;        /* to kHz */
      if (freq > 108000)
            freq = 108000;
      if (freq < 87000)
            freq = 87000;
      /* crystal fixup */
      if (tea->tea5759)
            freq -= tea->freq_fixup;
      else
            freq += tea->freq_fixup;
      /* freq /= 12.5 */
      freq *= 10;
      freq /= 125;

      tea->val &= ~TEA575X_BIT_FREQ_MASK;
      tea->val |= freq & TEA575X_BIT_FREQ_MASK;
      tea->ops->write(tea, tea->val);
}

/*
 * Linux Video interface
 */

static int vidioc_querycap(struct file *file, void  *priv,
                              struct v4l2_capability *v)
{
      struct snd_tea575x *tea = video_drvdata(file);

      strcpy(v->card, tea->tea5759 ? "TEA5759" : "TEA5757");
      strlcpy(v->driver, "tea575x-tuner", sizeof(v->driver));
      strlcpy(v->card, "Maestro Radio", sizeof(v->card));
      sprintf(v->bus_info, "PCI");
      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 = FREQ_LO;
      v->rangehigh = FREQ_HI;
      v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
      v->capability = V4L2_TUNER_CAP_LOW;
      v->audmode = V4L2_TUNER_MODE_MONO;
      v->signal = 0xffff;
      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_frequency(struct file *file, void *priv,
                              struct v4l2_frequency *f)
{
      struct snd_tea575x *tea = video_drvdata(file);

      f->type = V4L2_TUNER_RADIO;
      f->frequency = tea->freq;
      return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
                              struct v4l2_frequency *f)
{
      struct snd_tea575x *tea = video_drvdata(file);

      if (f->frequency < FREQ_LO || f->frequency > FREQ_HI)
            return -EINVAL;

      tea->freq = f->frequency;

      snd_tea575x_set_freq(tea);

      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, "Radio");
      a->capability = V4L2_AUDCAP_STEREO;
      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_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 snd_tea575x *tea = video_drvdata(file);

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (tea->ops->mute) {
                  ctrl->value = tea->mute;
                  return 0;
            }
      }
      return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
                              struct v4l2_control *ctrl)
{
      struct snd_tea575x *tea = video_drvdata(file);

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (tea->ops->mute) {
                  tea->ops->mute(tea, ctrl->value);
                  tea->mute = 1;
                  return 0;
            }
      }
      return -EINVAL;
}

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 snd_tea575x_exclusive_open(struct file *file)
{
      struct snd_tea575x *tea = video_drvdata(file);

      return test_and_set_bit(0, &tea->in_use) ? -EBUSY : 0;
}

static int snd_tea575x_exclusive_release(struct file *file)
{
      struct snd_tea575x *tea = video_drvdata(file);

      clear_bit(0, &tea->in_use);
      return 0;
}

static const struct v4l2_file_operations tea575x_fops = {
      .owner            = THIS_MODULE,
      .open           = snd_tea575x_exclusive_open,
      .release        = snd_tea575x_exclusive_release,
      .ioctl            = video_ioctl2,
};

static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
      .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 struct video_device tea575x_radio = {
      .name           = "tea575x-tuner",
      .fops           = &tea575x_fops,
      .ioctl_ops  = &tea575x_ioctl_ops,
      .release    = video_device_release,
};

/*
 * initialize all the tea575x chips
 */
void snd_tea575x_init(struct snd_tea575x *tea)
{
      int retval;
      unsigned int val;
      struct video_device *tea575x_radio_inst;

      val = tea->ops->read(tea);
      if (val == 0x1ffffff || val == 0) {
            snd_printk(KERN_ERR
                     "tea575x-tuner: Cannot find TEA575x chip\n");
            return;
      }

      tea->in_use = 0;
      tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
      tea->freq = 90500 * 16;       /* 90.5Mhz default */

      tea575x_radio_inst = video_device_alloc();
      if (tea575x_radio_inst == NULL) {
            printk(KERN_ERR "tea575x-tuner: not enough memory\n");
            return;
      }

      memcpy(tea575x_radio_inst, &tea575x_radio, sizeof(tea575x_radio));

      strcpy(tea575x_radio.name, tea->tea5759 ?
                           "TEA5759 radio" : "TEA5757 radio");

      video_set_drvdata(tea575x_radio_inst, tea);

      retval = video_register_device(tea575x_radio_inst,
                               VFL_TYPE_RADIO, radio_nr);
      if (retval) {
            printk(KERN_ERR "tea575x-tuner: can't register video device!\n");
            kfree(tea575x_radio_inst);
            return;
      }

      snd_tea575x_set_freq(tea);

      /* mute on init */
      if (tea->ops->mute) {
            tea->ops->mute(tea, 1);
            tea->mute = 1;
      }
      tea->vd = tea575x_radio_inst;
}

void snd_tea575x_exit(struct snd_tea575x *tea)
{
      if (tea->vd) {
            video_unregister_device(tea->vd);
            tea->vd = NULL;
      }
}

static int __init alsa_tea575x_module_init(void)
{
      return 0;
}

static void __exit alsa_tea575x_module_exit(void)
{
}

module_init(alsa_tea575x_module_init)
module_exit(alsa_tea575x_module_exit)

EXPORT_SYMBOL(snd_tea575x_init);
EXPORT_SYMBOL(snd_tea575x_exit);

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