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saa711x.c

/*
 * saa711x - Philips SAA711x video decoder driver version 0.0.1
 *
 * To do: Now, it handles only saa7113/7114. Should be improved to
 * handle all Philips saa711x devices.
 *
 * Based on saa7113 driver from Dave Perks <dperks@ibm.net>
 *
 * 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 <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/types.h>
#include <asm/uaccess.h>
#include <linux/videodev.h>

MODULE_DESCRIPTION("Philips SAA711x video decoder driver");
MODULE_AUTHOR("Dave Perks, Jose Ignacio Gijon, Joerg Heckenbach, Mark McClelland, Dwaine Garden");
MODULE_LICENSE("GPL");

#include <linux/i2c.h>

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

#include <linux/video_decoder.h>

static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, " Set the default Debug level.  Default: 0 (Off) - (0-1)");


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

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

struct saa711x {
      unsigned char reg[32];

      int norm;
      int input;
      int enable;
      int bright;
      int contrast;
      int hue;
      int sat;
};

#define   I2C_SAA7113        0x4A
#define   I2C_SAA7114        0x42

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

static inline int
saa711x_write (struct i2c_client *client,
             u8                 reg,
             u8                 value)
{
      struct saa711x *decoder = i2c_get_clientdata(client);

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

static int
saa711x_write_block (struct i2c_client *client,
                 const u8          *data,
                 unsigned int       len)
{
      int ret = -1;
      u8 reg;

      /* the saa711x 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 saa711x *decoder = i2c_get_clientdata(client);
            struct i2c_msg msg;
            u8 block_data[32];

            msg.addr = client->addr;
            msg.flags = 0;
            while (len >= 2) {
                  msg.buf = (char *) block_data;
                  msg.len = 0;
                  block_data[msg.len++] = reg = data[0];
                  do {
                        block_data[msg.len++] =
                            decoder->reg[reg++] = data[1];
                        len -= 2;
                        data += 2;
                  } while (len >= 2 && data[0] == reg &&
                         msg.len < 32);
                  if ((ret = i2c_transfer(client->adapter,
                                    &msg, 1)) < 0)
                        break;
            }
      } else {
            /* do some slow I2C emulation kind of thing */
            while (len >= 2) {
                  reg = *data++;
                  if ((ret = saa711x_write(client, reg,
                                     *data++)) < 0)
                        break;
                  len -= 2;
            }
      }

      return ret;
}

static int
saa711x_init_decoder (struct i2c_client *client,
            struct video_decoder_init *init)
{
      return saa711x_write_block(client, init->data, init->len);
}

static inline int
saa711x_read (struct i2c_client *client,
            u8                 reg)
{
      return i2c_smbus_read_byte_data(client, reg);
}

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

static const unsigned char saa711x_i2c_init[] = {
      0x00, 0x00, /* PH711x_CHIP_VERSION 00 - ID byte */
      0x01, 0x08, /* PH711x_INCREMENT_DELAY - (1) (1) (1) (1) IDEL3 IDEL2 IDELL1 IDEL0 */
      0x02, 0xc0, /* PH711x_ANALOG_INPUT_CONTR_1 - FUSE1 FUSE0 GUDL1 GUDL0 MODE3 MODE2 MODE1 MODE0 */
      0x03, 0x23, /* PH711x_ANALOG_INPUT_CONTR_2 - (1) HLNRS VBSL WPOFF HOLDG GAFIX GAI28 GAI18 */
      0x04, 0x00, /* PH711x_ANALOG_INPUT_CONTR_3 - GAI17 GAI16 GAI15 GAI14 GAI13 GAI12 GAI11 GAI10 */
      0x05, 0x00, /* PH711x_ANALOG_INPUT_CONTR_4 - GAI27 GAI26 GAI25 GAI24 GAI23 GAI22 GAI21 GAI20 */
      0x06, 0xeb, /* PH711x_HORIZONTAL_SYNC_START - HSB7 HSB6 HSB5 HSB4 HSB3 HSB2 HSB1 HSB0 */
      0x07, 0xe0, /* PH711x_HORIZONTAL_SYNC_STOP - HSS7 HSS6 HSS5 HSS4 HSS3 HSS2 HSS1 HSS0 */
      0x08, 0x88, /* PH711x_SYNC_CONTROL - AUFD FSEL FOET HTC1 HTC0 HPLL VNOI1 VNOI0 */
      0x09, 0x00, /* PH711x_LUMINANCE_CONTROL - BYPS PREF BPSS1 BPSS0 VBLB UPTCV APER1 APER0 */
      0x0a, 0x80, /* PH711x_LUMINANCE_BRIGHTNESS - BRIG7 BRIG6 BRIG5 BRIG4 BRIG3 BRIG2 BRIG1 BRIG0 */
      0x0b, 0x47, /* PH711x_LUMINANCE_CONTRAST - CONT7 CONT6 CONT5 CONT4 CONT3 CONT2 CONT1 CONT0 */
      0x0c, 0x40, /* PH711x_CHROMA_SATURATION - SATN7 SATN6 SATN5 SATN4 SATN3 SATN2 SATN1 SATN0 */
      0x0d, 0x00, /* PH711x_CHROMA_HUE_CONTROL - HUEC7 HUEC6 HUEC5 HUEC4 HUEC3 HUEC2 HUEC1 HUEC0 */
      0x0e, 0x01, /* PH711x_CHROMA_CONTROL - CDTO CSTD2 CSTD1 CSTD0 DCCF FCTC CHBW1 CHBW0 */
      0x0f, 0xaa, /* PH711x_CHROMA_GAIN_CONTROL - ACGC CGAIN6 CGAIN5 CGAIN4 CGAIN3 CGAIN2 CGAIN1 CGAIN0 */
      0x10, 0x00, /* PH711x_FORMAT_DELAY_CONTROL - OFTS1 OFTS0 HDEL1 HDEL0 VRLN YDEL2 YDEL1 YDEL0 */
      0x11, 0x1C, /* PH711x_OUTPUT_CONTROL_1 - GPSW1 CM99 GPSW0 HLSEL OEYC OERT VIPB COLO */
      0x12, 0x01, /* PH711x_OUTPUT_CONTROL_2 - RTSE13 RTSE12 RTSE11 RTSE10 RTSE03 RTSE02 RTSE01 RTSE00 */
      0x13, 0x00, /* PH711x_OUTPUT_CONTROL_3 - ADLSB (1) (1) OLDSB FIDP (1) AOSL1 AOSL0 */
      0x14, 0x00, /* RESERVED 14 - (1) (1) (1) (1) (1) (1) (1) (1) */
      0x15, 0x00, /* PH711x_V_GATE1_START - VSTA7 VSTA6 VSTA5 VSTA4 VSTA3 VSTA2 VSTA1 VSTA0 */
      0x16, 0x00, /* PH711x_V_GATE1_STOP - VSTO7 VSTO6 VSTO5 VSTO4 VSTO3 VSTO2 VSTO1 VSTO0 */
      0x17, 0x00, /* PH711x_V_GATE1_MSB - (1) (1) (1) (1) (1) (1) VSTO8 VSTA8 */
};

static int
saa711x_command (struct i2c_client *client,
             unsigned int       cmd,
             void              *arg)
{
      struct saa711x *decoder = i2c_get_clientdata(client);

      switch (cmd) {

      case 0:
      case DECODER_INIT:
      {
            struct video_decoder_init *init = arg;
            if (NULL != init)
                  return saa711x_init_decoder(client, init);
            else {
                  struct video_decoder_init vdi;
                  vdi.data = saa711x_i2c_init;
                  vdi.len = sizeof(saa711x_i2c_init);
                  return saa711x_init_decoder(client, &vdi);
            }
      }

      case DECODER_DUMP:
      {
            int i;

            for (i = 0; i < 32; i += 16) {
                  int j;

                  printk(KERN_DEBUG "%s: %03x", I2C_NAME(client), i);
                  for (j = 0; j < 16; ++j) {
                        printk(" %02x",
                               saa711x_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 = saa711x_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) {
                  saa711x_write(client, 0x11,
                        (decoder->reg[0x11] | 0x80));
            } else {
                  saa711x_write(client, 0x11,
                        (decoder->reg[0x11] & 0x7f));
            }
            break;
      }

      case DECODER_SET_VBI_BYPASS:
      {
            int *iarg = arg;
            if (0 != *iarg) {
                  saa711x_write(client, 0x13,
                        (decoder->reg[0x13] & 0xf0) | 0x0a);
            } else {
                  saa711x_write(client, 0x13,
                        (decoder->reg[0x13] & 0xf0));
            }
            break;
      }

      case DECODER_SET_NORM:
      {
            int *iarg = arg;

            switch (*iarg) {

            case VIDEO_MODE_NTSC:
                  saa711x_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x40);
                  saa711x_write(client, 0x0e,
                              (decoder->reg[0x0e] & 0x8f));
                  break;

            case VIDEO_MODE_PAL:
                  saa711x_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x00);
                  saa711x_write(client, 0x0e,
                              (decoder->reg[0x0e] & 0x8f));
                  break;

            case VIDEO_MODE_SECAM:
                  saa711x_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x00);
                  saa711x_write(client, 0x0e,
                              (decoder->reg[0x0e] & 0x8f) | 0x50);
                  break;

            case VIDEO_MODE_AUTO:
                  saa711x_write(client, 0x08,
                              (decoder->reg[0x08] & 0x3f) | 0x80);
                  saa711x_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 > 9) {
                  return -EINVAL;
            }
            if (decoder->input != *iarg) {
                  decoder->input = *iarg;
                  /* select mode */
                  saa711x_write(client, 0x02,
                              (decoder->reg[0x02] & 0xf0) | decoder->input);
                  /* bypass chrominance trap for modes 4..7 */
                  saa711x_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) {
                        saa711x_write(client, 0x02,
                                    (decoder->
                                     reg[0x02] & 0xf8) |
                                    decoder->input);
                        saa711x_write(client, 0x08,
                                    (decoder->reg[0x08] & 0xfb));
                        saa711x_write(client, 0x11,
                                    (decoder->
                                     reg[0x11] & 0xf3) | 0x0c);
                  } else {
                        saa711x_write(client, 0x02,
                                    (decoder->reg[0x02] & 0xf8));
                        saa711x_write(client, 0x08,
                                    (decoder->
                                     reg[0x08] & 0xfb) | 0x04);
                        saa711x_write(client, 0x11,
                                    (decoder->reg[0x11] & 0xf3));
                  }
            }
      }
            break;

      case DECODER_SET_PICTURE:
      {
            struct video_picture *pic = arg;

            if (decoder->bright != pic->brightness) {
                  /* We want 0 to 255 we get 0-65535 */
                  decoder->bright = pic->brightness;
                  saa711x_write(client, 0x0a, decoder->bright >> 8);
            }
            if (decoder->contrast != pic->contrast) {
                  /* We want 0 to 127 we get 0-65535 */
                  decoder->contrast = pic->contrast;
                  saa711x_write(client, 0x0b,
                              decoder->contrast >> 9);
            }
            if (decoder->sat != pic->colour) {
                  /* We want 0 to 127 we get 0-65535 */
                  decoder->sat = pic->colour;
                  saa711x_write(client, 0x0c, decoder->sat >> 9);
            }
            if (decoder->hue != pic->hue) {
                  /* We want -128 to 127 we get 0-65535 */
                  decoder->hue = pic->hue;
                  saa711x_write(client, 0x0d,
                              (decoder->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'
 */

/* standard i2c insmod options */
static unsigned short normal_i2c[] = {
      I2C_SAA7113>>1,         /* saa7113 */
      I2C_SAA7114>>1,         /* saa7114 */
      I2C_CLIENT_END
};

I2C_CLIENT_INSMOD;


static struct i2c_driver i2c_driver_saa711x;

static int
saa711x_detect_client (struct i2c_adapter *adapter,
                   int                 address,
                   int                 kind)
{
      int i;
      struct i2c_client *client;
      struct saa711x *decoder;
      struct video_decoder_init vdi;

      dprintk(1,
            KERN_INFO
            "saa711x.c: detecting saa711x 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_saa711x;
      strlcpy(I2C_NAME(client), "saa711x", sizeof(I2C_NAME(client)));
      decoder = kzalloc(sizeof(struct saa711x), GFP_KERNEL);
      if (decoder == NULL) {
            kfree(client);
            return -ENOMEM;
      }
      decoder->norm = VIDEO_MODE_NTSC;
      decoder->input = 0;
      decoder->enable = 1;
      decoder->bright = 32768;
      decoder->contrast = 32768;
      decoder->hue = 32768;
      decoder->sat = 32768;
      i2c_set_clientdata(client, decoder);

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

      vdi.data = saa711x_i2c_init;
      vdi.len = sizeof(saa711x_i2c_init);
      i = saa711x_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), saa711x_read(client, 0x00) >> 4,
                  client->addr << 1);
      }

      return 0;
}

static int
saa711x_attach_adapter (struct i2c_adapter *adapter)
{
      dprintk(1,
            KERN_INFO
            "saa711x.c: starting probe for adapter %s (0x%x)\n",
            I2C_NAME(adapter), adapter->id);
      return i2c_probe(adapter, &addr_data, &saa711x_detect_client);
}

static int
saa711x_detach_client (struct i2c_client *client)
{
      struct saa711x *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_saa711x = {
      .driver = {
            .name = "saa711x",
      },
      .id = I2C_DRIVERID_SAA711X,
      .attach_adapter = saa711x_attach_adapter,
      .detach_client = saa711x_detach_client,
      .command = saa711x_command,
};

static int __init
saa711x_init (void)
{
      return i2c_add_driver(&i2c_driver_saa711x);
}

static void __exit
saa711x_exit (void)
{
      i2c_del_driver(&i2c_driver_saa711x);
}

module_init(saa711x_init);
module_exit(saa711x_exit);

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