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adv7175.c

/*
 *  adv7175 - adv7175a video encoder driver version 0.0.3
 *
 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
 * Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
 *    - some corrections for Pinnacle Systems Inc. DC10plus card.
 *
 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
 *    - moved over to linux>=2.4.x i2c protocol (9/9/2002)
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/signal.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/uaccess.h>

#include <linux/videodev.h>
#include <linux/video_encoder.h>

MODULE_DESCRIPTION("Analog Devices ADV7175 video encoder driver");
MODULE_AUTHOR("Dave Perks");
MODULE_LICENSE("GPL");


#define I2C_NAME(s) (s)->name


static int debug = 0;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-1)");

#define dprintk(num, format, args...) \
      do { \
            if (debug >= num) \
                  printk(format, ##args); \
      } while (0)

/* ----------------------------------------------------------------------- */

struct adv7175 {
      int norm;
      int input;
      int enable;
      int bright;
      int contrast;
      int hue;
      int sat;
};

#define   I2C_ADV7175        0xd4
#define   I2C_ADV7176        0x54

static char adv7175_name[] = "adv7175";
static char adv7176_name[] = "adv7176";

static char *inputs[] = { "pass_through", "play_back", "color_bar" };
static char *norms[] = { "PAL", "NTSC", "SECAM->PAL (may not work!)" };

/* ----------------------------------------------------------------------- */

static inline int
adv7175_write (struct i2c_client *client,
             u8                 reg,
             u8                 value)
{
      return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int
adv7175_read (struct i2c_client *client,
            u8                 reg)
{
      return i2c_smbus_read_byte_data(client, reg);
}

static int
adv7175_write_block (struct i2c_client *client,
                 const u8          *data,
                 unsigned int       len)
{
      int ret = -1;
      u8 reg;

      /* the adv7175 has an autoincrement function, use it if
       * the adapter understands raw I2C */
      if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
            /* do raw I2C, not smbus compatible */
            u8 block_data[32];
            int block_len;

            while (len >= 2) {
                  block_len = 0;
                  block_data[block_len++] = reg = data[0];
                  do {
                        block_data[block_len++] = data[1];
                        reg++;
                        len -= 2;
                        data += 2;
                  } while (len >= 2 && data[0] == reg &&
                         block_len < 32);
                  if ((ret = i2c_master_send(client, block_data,
                                       block_len)) < 0)
                        break;
            }
      } else {
            /* do some slow I2C emulation kind of thing */
            while (len >= 2) {
                  reg = *data++;
                  if ((ret = adv7175_write(client, reg,
                                     *data++)) < 0)
                        break;
                  len -= 2;
            }
      }

      return ret;
}

static void
set_subcarrier_freq (struct i2c_client *client,
                 int                pass_through)
{
      /* for some reason pass_through NTSC needs
       * a different sub-carrier freq to remain stable. */
      if(pass_through)
            adv7175_write(client, 0x02, 0x00);
      else
            adv7175_write(client, 0x02, 0x55);

      adv7175_write(client, 0x03, 0x55);
      adv7175_write(client, 0x04, 0x55);
      adv7175_write(client, 0x05, 0x25);
}

/* ----------------------------------------------------------------------- */
// Output filter:  S-Video  Composite

#define MR050       0x11      //0x09
#define MR060       0x14      //0x0c

//---------------------------------------------------------------------------

#define TR0MODE     0x46
#define TR0RST        0x80

#define TR1CAPT       0x80
#define TR1PLAY       0x00

static const unsigned char init_common[] = {

      0x00, MR050,            /* MR0, PAL enabled */
      0x01, 0x00,       /* MR1 */
      0x02, 0x0c,       /* subc. freq. */
      0x03, 0x8c,       /* subc. freq. */
      0x04, 0x79,       /* subc. freq. */
      0x05, 0x26,       /* subc. freq. */
      0x06, 0x40,       /* subc. phase */

      0x07, TR0MODE,          /* TR0, 16bit */
      0x08, 0x21,       /*  */
      0x09, 0x00,       /*  */
      0x0a, 0x00,       /*  */
      0x0b, 0x00,       /*  */
      0x0c, TR1CAPT,          /* TR1 */
      0x0d, 0x4f,       /* MR2 */
      0x0e, 0x00,       /*  */
      0x0f, 0x00,       /*  */
      0x10, 0x00,       /*  */
      0x11, 0x00,       /*  */
};

static const unsigned char init_pal[] = {
      0x00, MR050,            /* MR0, PAL enabled */
      0x01, 0x00,       /* MR1 */
      0x02, 0x0c,       /* subc. freq. */
      0x03, 0x8c,       /* subc. freq. */
      0x04, 0x79,       /* subc. freq. */
      0x05, 0x26,       /* subc. freq. */
      0x06, 0x40,       /* subc. phase */
};

static const unsigned char init_ntsc[] = {
      0x00, MR060,            /* MR0, NTSC enabled */
      0x01, 0x00,       /* MR1 */
      0x02, 0x55,       /* subc. freq. */
      0x03, 0x55,       /* subc. freq. */
      0x04, 0x55,       /* subc. freq. */
      0x05, 0x25,       /* subc. freq. */
      0x06, 0x1a,       /* subc. phase */
};

static int
adv7175_command (struct i2c_client *client,
             unsigned int       cmd,
             void              *arg)
{
      struct adv7175 *encoder = i2c_get_clientdata(client);

      switch (cmd) {

      case 0:
            /* This is just for testing!!! */
            adv7175_write_block(client, init_common,
                            sizeof(init_common));
            adv7175_write(client, 0x07, TR0MODE | TR0RST);
            adv7175_write(client, 0x07, TR0MODE);
            break;

      case ENCODER_GET_CAPABILITIES:
      {
            struct video_encoder_capability *cap = arg;

            cap->flags = VIDEO_ENCODER_PAL |
                       VIDEO_ENCODER_NTSC |
                       VIDEO_ENCODER_SECAM; /* well, hacky */
            cap->inputs = 2;
            cap->outputs = 1;
      }
            break;

      case ENCODER_SET_NORM:
      {
            int iarg = *(int *) arg;

            switch (iarg) {

            case VIDEO_MODE_NTSC:
                  adv7175_write_block(client, init_ntsc,
                                  sizeof(init_ntsc));
                  if (encoder->input == 0)
                        adv7175_write(client, 0x0d, 0x4f);  // Enable genlock
                  adv7175_write(client, 0x07, TR0MODE | TR0RST);
                  adv7175_write(client, 0x07, TR0MODE);
                  break;

            case VIDEO_MODE_PAL:
                  adv7175_write_block(client, init_pal,
                                  sizeof(init_pal));
                  if (encoder->input == 0)
                        adv7175_write(client, 0x0d, 0x4f);  // Enable genlock
                  adv7175_write(client, 0x07, TR0MODE | TR0RST);
                  adv7175_write(client, 0x07, TR0MODE);
                  break;

            case VIDEO_MODE_SECAM:  // WARNING! ADV7176 does not support SECAM.
                  /* This is an attempt to convert
                   * SECAM->PAL (typically it does not work
                   * due to genlock: when decoder is in SECAM
                   * and encoder in in PAL the subcarrier can
                   * not be syncronized with horizontal
                   * quency) */
                  adv7175_write_block(client, init_pal,
                                  sizeof(init_pal));
                  if (encoder->input == 0)
                        adv7175_write(client, 0x0d, 0x49);  // Disable genlock
                  adv7175_write(client, 0x07, TR0MODE | TR0RST);
                  adv7175_write(client, 0x07, TR0MODE);
                  break;
            default:
                  dprintk(1, KERN_ERR "%s: illegal norm: %d\n",
                        I2C_NAME(client), iarg);
                  return -EINVAL;

            }
            dprintk(1, KERN_INFO "%s: switched to %s\n", I2C_NAME(client),
                  norms[iarg]);
            encoder->norm = iarg;
      }
            break;

      case ENCODER_SET_INPUT:
      {
            int iarg = *(int *) arg;

            /* RJ: *iarg = 0: input is from SAA7110
             *iarg = 1: input is from ZR36060
             *iarg = 2: color bar */

            switch (iarg) {

            case 0:
                  adv7175_write(client, 0x01, 0x00);

                  if (encoder->norm == VIDEO_MODE_NTSC)
                        set_subcarrier_freq(client, 1);

                  adv7175_write(client, 0x0c, TR1CAPT);     /* TR1 */
                  if (encoder->norm == VIDEO_MODE_SECAM)
                        adv7175_write(client, 0x0d, 0x49);  // Disable genlock
                  else
                        adv7175_write(client, 0x0d, 0x4f);  // Enable genlock
                  adv7175_write(client, 0x07, TR0MODE | TR0RST);
                  adv7175_write(client, 0x07, TR0MODE);
                  //udelay(10);
                  break;

            case 1:
                  adv7175_write(client, 0x01, 0x00);

                  if (encoder->norm == VIDEO_MODE_NTSC)
                        set_subcarrier_freq(client, 0);

                  adv7175_write(client, 0x0c, TR1PLAY);     /* TR1 */
                  adv7175_write(client, 0x0d, 0x49);
                  adv7175_write(client, 0x07, TR0MODE | TR0RST);
                  adv7175_write(client, 0x07, TR0MODE);
                  //udelay(10);
                  break;

            case 2:
                  adv7175_write(client, 0x01, 0x80);

                  if (encoder->norm == VIDEO_MODE_NTSC)
                        set_subcarrier_freq(client, 0);

                  adv7175_write(client, 0x0d, 0x49);
                  adv7175_write(client, 0x07, TR0MODE | TR0RST);
                  adv7175_write(client, 0x07, TR0MODE);
                  //udelay(10);
                  break;

            default:
                  dprintk(1, KERN_ERR "%s: illegal input: %d\n",
                        I2C_NAME(client), iarg);
                  return -EINVAL;

            }
            dprintk(1, KERN_INFO "%s: switched to %s\n", I2C_NAME(client),
                  inputs[iarg]);
            encoder->input = iarg;
      }
            break;

      case ENCODER_SET_OUTPUT:
      {
            int *iarg = arg;

            /* not much choice of outputs */
            if (*iarg != 0) {
                  return -EINVAL;
            }
      }
            break;

      case ENCODER_ENABLE_OUTPUT:
      {
            int *iarg = arg;

            encoder->enable = !!*iarg;
      }
            break;

      default:
            return -EINVAL;
      }

      return 0;
}

/* ----------------------------------------------------------------------- */

/*
 * Generic i2c probe
 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 */
static unsigned short normal_i2c[] =
    { I2C_ADV7175 >> 1, (I2C_ADV7175 >> 1) + 1,
      I2C_ADV7176 >> 1, (I2C_ADV7176 >> 1) + 1,
      I2C_CLIENT_END
};

static unsigned short ignore = I2C_CLIENT_END;

static struct i2c_client_address_data addr_data = {
      .normal_i2c       = normal_i2c,
      .probe                  = &ignore,
      .ignore                 = &ignore,
};

static struct i2c_driver i2c_driver_adv7175;

static int
adv7175_detect_client (struct i2c_adapter *adapter,
                   int                 address,
                   int                 kind)
{
      int i;
      struct i2c_client *client;
      struct adv7175 *encoder;
      char *dname;

      dprintk(1,
            KERN_INFO
            "adv7175.c: detecting adv7175 client on address 0x%x\n",
            address << 1);

      /* Check if the adapter supports the needed features */
      if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
            return 0;

      client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
      if (client == 0)
            return -ENOMEM;
      client->addr = address;
      client->adapter = adapter;
      client->driver = &i2c_driver_adv7175;
      if ((client->addr == I2C_ADV7175 >> 1) ||
          (client->addr == (I2C_ADV7175 >> 1) + 1)) {
            dname = adv7175_name;
      } else if ((client->addr == I2C_ADV7176 >> 1) ||
               (client->addr == (I2C_ADV7176 >> 1) + 1)) {
            dname = adv7176_name;
      } else {
            /* We should never get here!!! */
            kfree(client);
            return 0;
      }
      strlcpy(I2C_NAME(client), dname, sizeof(I2C_NAME(client)));

      encoder = kzalloc(sizeof(struct adv7175), GFP_KERNEL);
      if (encoder == NULL) {
            kfree(client);
            return -ENOMEM;
      }
      encoder->norm = VIDEO_MODE_PAL;
      encoder->input = 0;
      encoder->enable = 1;
      i2c_set_clientdata(client, encoder);

      i = i2c_attach_client(client);
      if (i) {
            kfree(client);
            kfree(encoder);
            return i;
      }

      i = adv7175_write_block(client, init_common, sizeof(init_common));
      if (i >= 0) {
            i = adv7175_write(client, 0x07, TR0MODE | TR0RST);
            i = adv7175_write(client, 0x07, TR0MODE);
            i = adv7175_read(client, 0x12);
            dprintk(1, KERN_INFO "%s_attach: rev. %d at 0x%x\n",
                  I2C_NAME(client), i & 1, client->addr << 1);
      }
      if (i < 0) {
            dprintk(1, KERN_ERR "%s_attach: init error 0x%x\n",
                  I2C_NAME(client), i);
      }

      return 0;
}

static int
adv7175_attach_adapter (struct i2c_adapter *adapter)
{
      dprintk(1,
            KERN_INFO
            "adv7175.c: starting probe for adapter %s (0x%x)\n",
            I2C_NAME(adapter), adapter->id);
      return i2c_probe(adapter, &addr_data, &adv7175_detect_client);
}

static int
adv7175_detach_client (struct i2c_client *client)
{
      struct adv7175 *encoder = i2c_get_clientdata(client);
      int err;

      err = i2c_detach_client(client);
      if (err) {
            return err;
      }

      kfree(encoder);
      kfree(client);

      return 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver i2c_driver_adv7175 = {
      .driver = {
            .name = "adv7175",      /* name */
      },

      .id = I2C_DRIVERID_ADV7175,

      .attach_adapter = adv7175_attach_adapter,
      .detach_client = adv7175_detach_client,
      .command = adv7175_command,
};

static int __init
adv7175_init (void)
{
      return i2c_add_driver(&i2c_driver_adv7175);
}

static void __exit
adv7175_exit (void)
{
      i2c_del_driver(&i2c_driver_adv7175);
}

module_init(adv7175_init);
module_exit(adv7175_exit);

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