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saa7111.c

/*
 * saa7111 - Philips SAA7111A video decoder driver version 0.0.3
 *
 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
 *
 * Slight changes for video timing and attachment output by
 * Wolfgang Scherr <scherr@net4you.net>
 *
 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
 *    - moved over to linux>=2.4.x i2c protocol (1/1/2003)
 *
 * Changes by Michael Hunold <michael@mihu.de>
 *    - implemented DECODER_SET_GPIO, DECODER_INIT, DECODER_SET_VBI_BYPASS
 *
 * 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_decoder.h>

MODULE_DESCRIPTION("Philips SAA7111 video decoder driver");
MODULE_AUTHOR("Dave Perks");
MODULE_LICENSE("GPL");


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


static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");

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

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

#define SAA7111_NR_REG        0x18

struct saa7111 {
      unsigned char reg[SAA7111_NR_REG];

      int norm;
      int input;
      int enable;
};

#define   I2C_SAA7111        0x48

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

static inline int
saa7111_write (struct i2c_client *client,
             u8                 reg,
             u8                 value)
{
      struct saa7111 *decoder = i2c_get_clientdata(client);

      decoder->reg[reg] = value;
      return i2c_smbus_write_byte_data(client, reg, value);
}

static inline void
saa7111_write_if_changed(struct i2c_client *client, u8 reg, u8 value)
{
      struct saa7111 *decoder = i2c_get_clientdata(client);

      if (decoder->reg[reg] != value) {
            decoder->reg[reg] = value;
            i2c_smbus_write_byte_data(client, reg, value);
      }
}

static int
saa7111_write_block (struct i2c_client *client,
                 const u8          *data,
                 unsigned int       len)
{
      int ret = -1;
      u8 reg;

      /* the saa7111 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 */
            struct saa7111 *decoder = i2c_get_clientdata(client);
            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++] =
                            decoder->reg[reg++] = data[1];
                        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 = saa7111_write(client, reg,
                                     *data++)) < 0)
                        break;
                  len -= 2;
            }
      }

      return ret;
}

static int
saa7111_init_decoder (struct i2c_client *client,
            struct video_decoder_init *init)
{
      return saa7111_write_block(client, init->data, init->len);
}

static inline int
saa7111_read (struct i2c_client *client,
            u8                 reg)
{
      return i2c_smbus_read_byte_data(client, reg);
}

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

static const unsigned char saa7111_i2c_init[] = {
      0x00, 0x00,       /* 00 - ID byte */
      0x01, 0x00,       /* 01 - reserved */

      /*front end */
      0x02, 0xd0,       /* 02 - FUSE=3, GUDL=2, MODE=0 */
      0x03, 0x23,       /* 03 - HLNRS=0, VBSL=1, WPOFF=0,
                         * HOLDG=0, GAFIX=0, GAI1=256, GAI2=256 */
      0x04, 0x00,       /* 04 - GAI1=256 */
      0x05, 0x00,       /* 05 - GAI2=256 */

      /* decoder */
      0x06, 0xf3,       /* 06 - HSB at  13(50Hz) /  17(60Hz)
                         * pixels after end of last line */
      /*0x07, 0x13,     * 07 - HSS at 113(50Hz) / 117(60Hz) pixels
                         * after end of last line */
      0x07, 0xe8,       /* 07 - HSS seems to be needed to
                         * work with NTSC, too */
      0x08, 0xc8,       /* 08 - AUFD=1, FSEL=1, EXFIL=0,
                         * VTRC=1, HPLL=0, VNOI=0 */
      0x09, 0x01,       /* 09 - BYPS=0, PREF=0, BPSS=0,
                         * VBLB=0, UPTCV=0, APER=1 */
      0x0a, 0x80,       /* 0a - BRIG=128 */
      0x0b, 0x47,       /* 0b - CONT=1.109 */
      0x0c, 0x40,       /* 0c - SATN=1.0 */
      0x0d, 0x00,       /* 0d - HUE=0 */
      0x0e, 0x01,       /* 0e - CDTO=0, CSTD=0, DCCF=0,
                         * FCTC=0, CHBW=1 */
      0x0f, 0x00,       /* 0f - reserved */
      0x10, 0x48,       /* 10 - OFTS=1, HDEL=0, VRLN=1, YDEL=0 */
      0x11, 0x1c,       /* 11 - GPSW=0, CM99=0, FECO=0, COMPO=1,
                         * OEYC=1, OEHV=1, VIPB=0, COLO=0 */
      0x12, 0x00,       /* 12 - output control 2 */
      0x13, 0x00,       /* 13 - output control 3 */
      0x14, 0x00,       /* 14 - reserved */
      0x15, 0x00,       /* 15 - VBI */
      0x16, 0x00,       /* 16 - VBI */
      0x17, 0x00,       /* 17 - VBI */
};

static int
saa7111_command (struct i2c_client *client,
             unsigned int       cmd,
             void              *arg)
{
      struct saa7111 *decoder = i2c_get_clientdata(client);

      switch (cmd) {

      case 0:
            break;
      case DECODER_INIT:
      {
            struct video_decoder_init *init = arg;
            if (NULL != init)
                  return saa7111_init_decoder(client, init);
            else {
                  struct video_decoder_init vdi;
                  vdi.data = saa7111_i2c_init;
                  vdi.len = sizeof(saa7111_i2c_init);
                  return saa7111_init_decoder(client, &vdi);
            }
      }

      case DECODER_DUMP:
      {
            int i;

            for (i = 0; i < SAA7111_NR_REG; i += 16) {
                  int j;

                  printk(KERN_DEBUG "%s: %03x", I2C_NAME(client), i);
                  for (j = 0; j < 16 && i + j < SAA7111_NR_REG; ++j) {
                        printk(" %02x",
                               saa7111_read(client, i + j));
                  }
                  printk("\n");
            }
      }
            break;

      case DECODER_GET_CAPABILITIES:
      {
            struct video_decoder_capability *cap = arg;

            cap->flags = VIDEO_DECODER_PAL |
                       VIDEO_DECODER_NTSC |
                       VIDEO_DECODER_SECAM |
                       VIDEO_DECODER_AUTO |
                       VIDEO_DECODER_CCIR;
            cap->inputs = 8;
            cap->outputs = 1;
      }
            break;

      case DECODER_GET_STATUS:
      {
            int *iarg = arg;
            int status;
            int res;

            status = saa7111_read(client, 0x1f);
            dprintk(1, KERN_DEBUG "%s status: 0x%02x\n", I2C_NAME(client),
                  status);
            res = 0;
            if ((status & (1 << 6)) == 0) {
                  res |= DECODER_STATUS_GOOD;
            }
            switch (decoder->norm) {
            case VIDEO_MODE_NTSC:
                  res |= DECODER_STATUS_NTSC;
                  break;
            case VIDEO_MODE_PAL:
                  res |= DECODER_STATUS_PAL;
                  break;
            case VIDEO_MODE_SECAM:
                  res |= DECODER_STATUS_SECAM;
                  break;
            default:
            case VIDEO_MODE_AUTO:
                  if ((status & (1 << 5)) != 0) {
                        res |= DECODER_STATUS_NTSC;
                  } else {
                        res |= DECODER_STATUS_PAL;
                  }
                  break;
            }
            if ((status & (1 << 0)) != 0) {
                  res |= DECODER_STATUS_COLOR;
            }
            *iarg = res;
      }
            break;

      case DECODER_SET_GPIO:
      {
            int *iarg = arg;
            if (0 != *iarg) {
                  saa7111_write(client, 0x11,
                        (decoder->reg[0x11] | 0x80));
            } else {
                  saa7111_write(client, 0x11,
                        (decoder->reg[0x11] & 0x7f));
            }
            break;
      }

      case DECODER_SET_VBI_BYPASS:
      {
            int *iarg = arg;
            if (0 != *iarg) {
                  saa7111_write(client, 0x13,
                        (decoder->reg[0x13] & 0xf0) | 0x0a);
            } else {
                  saa7111_write(client, 0x13,
                        (decoder->reg[0x13] & 0xf0));
            }
            break;
      }

      case DECODER_SET_NORM:
      {
            int *iarg = arg;

            switch (*iarg) {

            case VIDEO_MODE_NTSC:
                  saa7111_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x40);
                  saa7111_write(client, 0x0e,
                              (decoder->reg[0x0e] & 0x8f));
                  break;

            case VIDEO_MODE_PAL:
                  saa7111_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x00);
                  saa7111_write(client, 0x0e,
                              (decoder->reg[0x0e] & 0x8f));
                  break;

            case VIDEO_MODE_SECAM:
                  saa7111_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x00);
                  saa7111_write(client, 0x0e,
                              (decoder->reg[0x0e] & 0x8f) | 0x50);
                  break;

            case VIDEO_MODE_AUTO:
                  saa7111_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x80);
                  saa7111_write(client, 0x0e,
                              (decoder->reg[0x0e] & 0x8f));
                  break;

            default:
                  return -EINVAL;

            }
            decoder->norm = *iarg;
      }
            break;

      case DECODER_SET_INPUT:
      {
            int *iarg = arg;

            if (*iarg < 0 || *iarg > 7) {
                  return -EINVAL;
            }

            if (decoder->input != *iarg) {
                  decoder->input = *iarg;
                  /* select mode */
                  saa7111_write(client, 0x02,
                              (decoder->
                               reg[0x02] & 0xf8) | decoder->input);
                  /* bypass chrominance trap for modes 4..7 */
                  saa7111_write(client, 0x09,
                              (decoder->
                               reg[0x09] & 0x7f) | ((decoder->
                                               input >
                                               3) ? 0x80 :
                                              0));
            }
      }
            break;

      case DECODER_SET_OUTPUT:
      {
            int *iarg = arg;

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

      case DECODER_ENABLE_OUTPUT:
      {
            int *iarg = arg;
            int enable = (*iarg != 0);

            if (decoder->enable != enable) {
                  decoder->enable = enable;

                  /* RJ: If output should be disabled (for
                   * playing videos), we also need a open PLL.
                   * The input is set to 0 (where no input
                   * source is connected), although this
                   * is not necessary.
                   *
                   * If output should be enabled, we have to
                   * reverse the above.
                   */

                  if (decoder->enable) {
                        saa7111_write(client, 0x02,
                                    (decoder->
                                     reg[0x02] & 0xf8) |
                                    decoder->input);
                        saa7111_write(client, 0x08,
                                    (decoder->reg[0x08] & 0xfb));
                        saa7111_write(client, 0x11,
                                    (decoder->
                                     reg[0x11] & 0xf3) | 0x0c);
                  } else {
                        saa7111_write(client, 0x02,
                                    (decoder->reg[0x02] & 0xf8));
                        saa7111_write(client, 0x08,
                                    (decoder->
                                     reg[0x08] & 0xfb) | 0x04);
                        saa7111_write(client, 0x11,
                                    (decoder->reg[0x11] & 0xf3));
                  }
            }
      }
            break;

      case DECODER_SET_PICTURE:
      {
            struct video_picture *pic = arg;

            /* We want 0 to 255 we get 0-65535 */
            saa7111_write_if_changed(client, 0x0a, pic->brightness >> 8);
            /* We want 0 to 127 we get 0-65535 */
            saa7111_write(client, 0x0b, pic->contrast >> 9);
            /* We want 0 to 127 we get 0-65535 */
            saa7111_write(client, 0x0c, pic->colour >> 9);
            /* We want -128 to 127 we get 0-65535 */
            saa7111_write(client, 0x0d, (pic->hue - 32768) >> 8);
      }
            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_SAA7111 >> 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_saa7111;

static int
saa7111_detect_client (struct i2c_adapter *adapter,
                   int                 address,
                   int                 kind)
{
      int i;
      struct i2c_client *client;
      struct saa7111 *decoder;
      struct video_decoder_init vdi;

      dprintk(1,
            KERN_INFO
            "saa7111.c: detecting saa7111 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_saa7111;
      strlcpy(I2C_NAME(client), "saa7111", sizeof(I2C_NAME(client)));

      decoder = kzalloc(sizeof(struct saa7111), GFP_KERNEL);
      if (decoder == NULL) {
            kfree(client);
            return -ENOMEM;
      }
      decoder->norm = VIDEO_MODE_NTSC;
      decoder->input = 0;
      decoder->enable = 1;
      i2c_set_clientdata(client, decoder);

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

      vdi.data = saa7111_i2c_init;
      vdi.len = sizeof(saa7111_i2c_init);
      i = saa7111_init_decoder(client, &vdi);
      if (i < 0) {
            dprintk(1, KERN_ERR "%s_attach error: init status %d\n",
                  I2C_NAME(client), i);
      } else {
            dprintk(1,
                  KERN_INFO
                  "%s_attach: chip version %x at address 0x%x\n",
                  I2C_NAME(client), saa7111_read(client, 0x00) >> 4,
                  client->addr << 1);
      }

      return 0;
}

static int
saa7111_attach_adapter (struct i2c_adapter *adapter)
{
      dprintk(1,
            KERN_INFO
            "saa7111.c: starting probe for adapter %s (0x%x)\n",
            I2C_NAME(adapter), adapter->id);
      return i2c_probe(adapter, &addr_data, &saa7111_detect_client);
}

static int
saa7111_detach_client (struct i2c_client *client)
{
      struct saa7111 *decoder = i2c_get_clientdata(client);
      int err;

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

      kfree(decoder);
      kfree(client);

      return 0;
}

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

static struct i2c_driver i2c_driver_saa7111 = {
      .driver = {
            .name = "saa7111",
      },

      .id = I2C_DRIVERID_SAA7111A,

      .attach_adapter = saa7111_attach_adapter,
      .detach_client = saa7111_detach_client,
      .command = saa7111_command,
};

static int __init
saa7111_init (void)
{
      return i2c_add_driver(&i2c_driver_saa7111);
}

static void __exit
saa7111_exit (void)
{
      i2c_del_driver(&i2c_driver_saa7111);
}

module_init(saa7111_init);
module_exit(saa7111_exit);

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