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saa7110.c

/*
 * saa7110 - Philips SAA7110(A) video decoder driver
 *
 * Copyright (C) 1998 Pauline Middelink <middelin@polyware.nl>
 *
 * 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 (1/1/2003)
 *
 * 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/types.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <asm/io.h>
#include <asm/uaccess.h>

MODULE_DESCRIPTION("Philips SAA7110 video decoder driver");
MODULE_AUTHOR("Pauline Middelink");
MODULE_LICENSE("GPL");

#include <linux/i2c.h>

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

#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/video_decoder.h>

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)

#define SAA7110_MAX_INPUT     9     /* 6 CVBS, 3 SVHS */
#define SAA7110_MAX_OUTPUT    0     /* its a decoder only */

#define     I2C_SAA7110       0x9C  /* or 0x9E */

#define SAA7110_NR_REG        0x35

struct saa7110 {
      u8 reg[SAA7110_NR_REG];

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

      wait_queue_head_t wq;
};

/* ----------------------------------------------------------------------- */
/* I2C support functions                                       */
/* ----------------------------------------------------------------------- */

static int
saa7110_write (struct i2c_client *client,
             u8                 reg,
             u8                 value)
{
      struct saa7110 *decoder = i2c_get_clientdata(client);

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

static int
saa7110_write_block (struct i2c_client *client,
                 const u8          *data,
                 unsigned int       len)
{
      int ret = -1;
      u8 reg = *data;         /* first register to write to */

      /* Sanity check */
      if (reg + (len - 1) > SAA7110_NR_REG)
            return ret;

      /* the saa7110 has an autoincrement function, use it if
       * the adapter understands raw I2C */
      if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
            struct saa7110 *decoder = i2c_get_clientdata(client);

            ret = i2c_master_send(client, data, len);

            /* Cache the written data */
            memcpy(decoder->reg + reg, data + 1, len - 1);
      } else {
            for (++data, --len; len; len--) {
                  if ((ret = saa7110_write(client, reg++,
                                     *data++)) < 0)
                        break;
            }
      }

      return ret;
}

static inline int
saa7110_read (struct i2c_client *client)
{
      return i2c_smbus_read_byte(client);
}

/* ----------------------------------------------------------------------- */
/* SAA7110 functions                                           */
/* ----------------------------------------------------------------------- */

#define FRESP_06H_COMPST 0x03 //0x13
#define FRESP_06H_SVIDEO 0x83 //0xC0


static int
saa7110_selmux (struct i2c_client *client,
            int                chan)
{
      static const unsigned char modes[9][8] = {
            /* mode 0 */
            {FRESP_06H_COMPST, 0xD9, 0x17, 0x40, 0x03,
                        0x44, 0x75, 0x16},
            /* mode 1 */
            {FRESP_06H_COMPST, 0xD8, 0x17, 0x40, 0x03,
                        0x44, 0x75, 0x16},
            /* mode 2 */
            {FRESP_06H_COMPST, 0xBA, 0x07, 0x91, 0x03,
                        0x60, 0xB5, 0x05},
            /* mode 3 */
            {FRESP_06H_COMPST, 0xB8, 0x07, 0x91, 0x03,
                        0x60, 0xB5, 0x05},
            /* mode 4 */
            {FRESP_06H_COMPST, 0x7C, 0x07, 0xD2, 0x83,
                        0x60, 0xB5, 0x03},
            /* mode 5 */
            {FRESP_06H_COMPST, 0x78, 0x07, 0xD2, 0x83,
                        0x60, 0xB5, 0x03},
            /* mode 6 */
            {FRESP_06H_SVIDEO, 0x59, 0x17, 0x42, 0xA3,
                        0x44, 0x75, 0x12},
            /* mode 7 */
            {FRESP_06H_SVIDEO, 0x9A, 0x17, 0xB1, 0x13,
                        0x60, 0xB5, 0x14},
            /* mode 8 */
            {FRESP_06H_SVIDEO, 0x3C, 0x27, 0xC1, 0x23,
                        0x44, 0x75, 0x21}
      };
      struct saa7110 *decoder = i2c_get_clientdata(client);
      const unsigned char *ptr = modes[chan];

      saa7110_write(client, 0x06, ptr[0]);      /* Luminance control    */
      saa7110_write(client, 0x20, ptr[1]);      /* Analog Control #1    */
      saa7110_write(client, 0x21, ptr[2]);      /* Analog Control #2    */
      saa7110_write(client, 0x22, ptr[3]);      /* Mixer Control #1     */
      saa7110_write(client, 0x2C, ptr[4]);      /* Mixer Control #2     */
      saa7110_write(client, 0x30, ptr[5]);      /* ADCs gain control    */
      saa7110_write(client, 0x31, ptr[6]);      /* Mixer Control #3     */
      saa7110_write(client, 0x21, ptr[7]);      /* Analog Control #2    */
      decoder->input = chan;

      return 0;
}

static const unsigned char initseq[1 + SAA7110_NR_REG] = {
      0, 0x4C, 0x3C, 0x0D, 0xEF, 0xBD, 0xF2, 0x03, 0x00,
      /* 0x08 */ 0xF8, 0xF8, 0x60, 0x60, 0x00, 0x86, 0x18, 0x90,
      /* 0x10 */ 0x00, 0x59, 0x40, 0x46, 0x42, 0x1A, 0xFF, 0xDA,
      /* 0x18 */ 0xF2, 0x8B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      /* 0x20 */ 0xD9, 0x16, 0x40, 0x41, 0x80, 0x41, 0x80, 0x4F,
      /* 0x28 */ 0xFE, 0x01, 0xCF, 0x0F, 0x03, 0x01, 0x03, 0x0C,
      /* 0x30 */ 0x44, 0x71, 0x02, 0x8C, 0x02
};

static int
determine_norm (struct i2c_client *client)
{
      DEFINE_WAIT(wait);
      struct saa7110 *decoder = i2c_get_clientdata(client);
      int status;

      /* mode changed, start automatic detection */
      saa7110_write_block(client, initseq, sizeof(initseq));
      saa7110_selmux(client, decoder->input);
      prepare_to_wait(&decoder->wq, &wait, TASK_UNINTERRUPTIBLE);
      schedule_timeout(msecs_to_jiffies(250));
      finish_wait(&decoder->wq, &wait);
      status = saa7110_read(client);
      if (status & 0x40) {
            dprintk(1, KERN_INFO "%s: status=0x%02x (no signal)\n",
                  I2C_NAME(client), status);
            return decoder->norm;   // no change
      }
      if ((status & 3) == 0) {
            saa7110_write(client, 0x06, 0x83);
            if (status & 0x20) {
                  dprintk(1,
                        KERN_INFO
                        "%s: status=0x%02x (NTSC/no color)\n",
                        I2C_NAME(client), status);
                  //saa7110_write(client,0x2E,0x81);
                  return VIDEO_MODE_NTSC;
            }
            dprintk(1, KERN_INFO "%s: status=0x%02x (PAL/no color)\n",
                  I2C_NAME(client), status);
            //saa7110_write(client,0x2E,0x9A);
            return VIDEO_MODE_PAL;
      }
      //saa7110_write(client,0x06,0x03);
      if (status & 0x20) {    /* 60Hz */
            dprintk(1, KERN_INFO "%s: status=0x%02x (NTSC)\n",
                  I2C_NAME(client), status);
            saa7110_write(client, 0x0D, 0x86);
            saa7110_write(client, 0x0F, 0x50);
            saa7110_write(client, 0x11, 0x2C);
            //saa7110_write(client,0x2E,0x81);
            return VIDEO_MODE_NTSC;
      }

      /* 50Hz -> PAL/SECAM */
      saa7110_write(client, 0x0D, 0x86);
      saa7110_write(client, 0x0F, 0x10);
      saa7110_write(client, 0x11, 0x59);
      //saa7110_write(client,0x2E,0x9A);

      prepare_to_wait(&decoder->wq, &wait, TASK_UNINTERRUPTIBLE);
      schedule_timeout(msecs_to_jiffies(250));
      finish_wait(&decoder->wq, &wait);

      status = saa7110_read(client);
      if ((status & 0x03) == 0x01) {
            dprintk(1, KERN_INFO "%s: status=0x%02x (SECAM)\n",
                  I2C_NAME(client), status);
            saa7110_write(client, 0x0D, 0x87);
            return VIDEO_MODE_SECAM;
      }
      dprintk(1, KERN_INFO "%s: status=0x%02x (PAL)\n", I2C_NAME(client),
            status);
      return VIDEO_MODE_PAL;
}

static int
saa7110_command (struct i2c_client *client,
             unsigned int       cmd,
             void              *arg)
{
      struct saa7110 *decoder = i2c_get_clientdata(client);
      int v;

      switch (cmd) {
      case 0:
            //saa7110_write_block(client, initseq, sizeof(initseq));
            break;

      case DECODER_GET_CAPABILITIES:
      {
            struct video_decoder_capability *dc = arg;

            dc->flags =
                VIDEO_DECODER_PAL | VIDEO_DECODER_NTSC |
                VIDEO_DECODER_SECAM | VIDEO_DECODER_AUTO;
            dc->inputs = SAA7110_MAX_INPUT;
            dc->outputs = SAA7110_MAX_OUTPUT;
      }
            break;

      case DECODER_GET_STATUS:
      {
            int status;
            int res = 0;

            status = saa7110_read(client);
            dprintk(1, KERN_INFO "%s: status=0x%02x norm=%d\n",
                  I2C_NAME(client), status, decoder->norm);
            if (!(status & 0x40))
                  res |= DECODER_STATUS_GOOD;
            if (status & 0x03)
                  res |= DECODER_STATUS_COLOR;

            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;
            }
            *(int *) arg = res;
      }
            break;

      case DECODER_SET_NORM:
            v = *(int *) arg;
            if (decoder->norm != v) {
                  decoder->norm = v;
                  //saa7110_write(client, 0x06, 0x03);
                  switch (v) {
                  case VIDEO_MODE_NTSC:
                        saa7110_write(client, 0x0D, 0x86);
                        saa7110_write(client, 0x0F, 0x50);
                        saa7110_write(client, 0x11, 0x2C);
                        //saa7110_write(client, 0x2E, 0x81);
                        dprintk(1,
                              KERN_INFO "%s: switched to NTSC\n",
                              I2C_NAME(client));
                        break;
                  case VIDEO_MODE_PAL:
                        saa7110_write(client, 0x0D, 0x86);
                        saa7110_write(client, 0x0F, 0x10);
                        saa7110_write(client, 0x11, 0x59);
                        //saa7110_write(client, 0x2E, 0x9A);
                        dprintk(1,
                              KERN_INFO "%s: switched to PAL\n",
                              I2C_NAME(client));
                        break;
                  case VIDEO_MODE_SECAM:
                        saa7110_write(client, 0x0D, 0x87);
                        saa7110_write(client, 0x0F, 0x10);
                        saa7110_write(client, 0x11, 0x59);
                        //saa7110_write(client, 0x2E, 0x9A);
                        dprintk(1,
                              KERN_INFO
                              "%s: switched to SECAM\n",
                              I2C_NAME(client));
                        break;
                  case VIDEO_MODE_AUTO:
                        dprintk(1,
                              KERN_INFO
                              "%s: TV standard detection...\n",
                              I2C_NAME(client));
                        decoder->norm = determine_norm(client);
                        *(int *) arg = decoder->norm;
                        break;
                  default:
                        return -EPERM;
                  }
            }
            break;

      case DECODER_SET_INPUT:
            v = *(int *) arg;
            if (v < 0 || v > SAA7110_MAX_INPUT) {
                  dprintk(1,
                        KERN_INFO "%s: input=%d not available\n",
                        I2C_NAME(client), v);
                  return -EINVAL;
            }
            if (decoder->input != v) {
                  saa7110_selmux(client, v);
                  dprintk(1, KERN_INFO "%s: switched to input=%d\n",
                        I2C_NAME(client), v);
            }
            break;

      case DECODER_SET_OUTPUT:
            v = *(int *) arg;
            /* not much choice of outputs */
            if (v != 0)
                  return -EINVAL;
            break;

      case DECODER_ENABLE_OUTPUT:
            v = *(int *) arg;
            if (decoder->enable != v) {
                  decoder->enable = v;
                  saa7110_write(client, 0x0E, v ? 0x18 : 0x80);
                  dprintk(1, KERN_INFO "%s: YUV %s\n", I2C_NAME(client),
                        v ? "on" : "off");
            }
            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;
                  saa7110_write(client, 0x19, decoder->bright >> 8);
            }
            if (decoder->contrast != pic->contrast) {
                  /* We want 0 to 127 we get 0-65535 */
                  decoder->contrast = pic->contrast;
                  saa7110_write(client, 0x13,
                              decoder->contrast >> 9);
            }
            if (decoder->sat != pic->colour) {
                  /* We want 0 to 127 we get 0-65535 */
                  decoder->sat = pic->colour;
                  saa7110_write(client, 0x12, decoder->sat >> 9);
            }
            if (decoder->hue != pic->hue) {
                  /* We want -128 to 127 we get 0-65535 */
                  decoder->hue = pic->hue;
                  saa7110_write(client, 0x07,
                              (decoder->hue >> 8) - 128);
            }
      }
            break;

      case DECODER_DUMP:
            for (v = 0; v < SAA7110_NR_REG; v += 16) {
                  int j;
                  dprintk(1, KERN_DEBUG "%s: %02x:", I2C_NAME(client),
                        v);
                  for (j = 0; j < 16 && v + j < SAA7110_NR_REG; j++)
                        dprintk(1, " %02x", decoder->reg[v + j]);
                  dprintk(1, "\n");
            }
            break;

      default:
            dprintk(1, KERN_INFO "unknown saa7110_command??(%d)\n",
                  cmd);
            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_SAA7110 >> 1,
      (I2C_SAA7110 >> 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_saa7110;

static int
saa7110_detect_client (struct i2c_adapter *adapter,
                   int                 address,
                   int                 kind)
{
      struct i2c_client *client;
      struct saa7110 *decoder;
      int rv;

      dprintk(1,
            KERN_INFO
            "saa7110.c: detecting saa7110 client on address 0x%x\n",
            address << 1);

      /* Check if the adapter supports the needed features */
      if (!i2c_check_functionality
          (adapter,
           I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_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_saa7110;
      strlcpy(I2C_NAME(client), "saa7110", sizeof(I2C_NAME(client)));

      decoder = kzalloc(sizeof(struct saa7110), GFP_KERNEL);
      if (decoder == 0) {
            kfree(client);
            return -ENOMEM;
      }
      decoder->norm = VIDEO_MODE_PAL;
      decoder->input = 0;
      decoder->enable = 1;
      decoder->bright = 32768;
      decoder->contrast = 32768;
      decoder->hue = 32768;
      decoder->sat = 32768;
      init_waitqueue_head(&decoder->wq);
      i2c_set_clientdata(client, decoder);

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

      rv = saa7110_write_block(client, initseq, sizeof(initseq));
      if (rv < 0)
            dprintk(1, KERN_ERR "%s_attach: init status %d\n",
                  I2C_NAME(client), rv);
      else {
            int ver, status;
            saa7110_write(client, 0x21, 0x10);
            saa7110_write(client, 0x0e, 0x18);
            saa7110_write(client, 0x0D, 0x04);
            ver = saa7110_read(client);
            saa7110_write(client, 0x0D, 0x06);
            //mdelay(150);
            status = saa7110_read(client);
            dprintk(1,
                  KERN_INFO
                  "%s_attach: SAA7110A version %x at 0x%02x, status=0x%02x\n",
                  I2C_NAME(client), ver, client->addr << 1, status);
            saa7110_write(client, 0x0D, 0x86);
            saa7110_write(client, 0x0F, 0x10);
            saa7110_write(client, 0x11, 0x59);
            //saa7110_write(client, 0x2E, 0x9A);
      }

      //saa7110_selmux(client,0);
      //determine_norm(client);
      /* setup and implicit mode 0 select has been performed */

      return 0;
}

static int
saa7110_attach_adapter (struct i2c_adapter *adapter)
{
      dprintk(1,
            KERN_INFO
            "saa7110.c: starting probe for adapter %s (0x%x)\n",
            I2C_NAME(adapter), adapter->id);
      return i2c_probe(adapter, &addr_data, &saa7110_detect_client);
}

static int
saa7110_detach_client (struct i2c_client *client)
{
      struct saa7110 *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_saa7110 = {
      .driver = {
            .name = "saa7110",
      },

      .id = I2C_DRIVERID_SAA7110,

      .attach_adapter = saa7110_attach_adapter,
      .detach_client = saa7110_detach_client,
      .command = saa7110_command,
};

static int __init
saa7110_init (void)
{
      return i2c_add_driver(&i2c_driver_saa7110);
}

static void __exit
saa7110_exit (void)
{
      i2c_del_driver(&i2c_driver_saa7110);
}

module_init(saa7110_init);
module_exit(saa7110_exit);

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