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saa7185.c

/*
 * saa7185 - Philips SAA7185B video encoder 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)
 *
 * 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("Philips SAA7185 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 saa7185 {
      unsigned char reg[128];

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

#define   I2C_SAA7185        0x88

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

static inline int
saa7185_read (struct i2c_client *client)
{
      return i2c_smbus_read_byte(client);
}

static int
saa7185_write (struct i2c_client *client,
             u8                 reg,
             u8                 value)
{
      struct saa7185 *encoder = i2c_get_clientdata(client);

      dprintk(1, KERN_DEBUG "SAA7185: %02x set to %02x\n", reg, value);
      encoder->reg[reg] = value;
      return i2c_smbus_write_byte_data(client, reg, value);
}

static int
saa7185_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 */
            struct saa7185 *encoder = 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++] =
                            encoder->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 = saa7185_write(client, reg,
                                     *data++)) < 0)
                        break;
                  len -= 2;
            }
      }

      return ret;
}

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

static const unsigned char init_common[] = {
      0x3a, 0x0f,       /* CBENB=0, V656=0, VY2C=1,
                         * YUV2C=1, MY2C=1, MUV2C=1 */

      0x42, 0x6b,       /* OVLY0=107 */
      0x43, 0x00,       /* OVLU0=0     white */
      0x44, 0x00,       /* OVLV0=0   */
      0x45, 0x22,       /* OVLY1=34  */
      0x46, 0xac,       /* OVLU1=172   yellow */
      0x47, 0x0e,       /* OVLV1=14  */
      0x48, 0x03,       /* OVLY2=3   */
      0x49, 0x1d,       /* OVLU2=29    cyan */
      0x4a, 0xac,       /* OVLV2=172 */
      0x4b, 0xf0,       /* OVLY3=240 */
      0x4c, 0xc8,       /* OVLU3=200   green */
      0x4d, 0xb9,       /* OVLV3=185 */
      0x4e, 0xd4,       /* OVLY4=212 */
      0x4f, 0x38,       /* OVLU4=56    magenta */
      0x50, 0x47,       /* OVLV4=71  */
      0x51, 0xc1,       /* OVLY5=193 */
      0x52, 0xe3,       /* OVLU5=227   red */
      0x53, 0x54,       /* OVLV5=84  */
      0x54, 0xa3,       /* OVLY6=163 */
      0x55, 0x54,       /* OVLU6=84    blue */
      0x56, 0xf2,       /* OVLV6=242 */
      0x57, 0x90,       /* OVLY7=144 */
      0x58, 0x00,       /* OVLU7=0     black */
      0x59, 0x00,       /* OVLV7=0   */

      0x5a, 0x00,       /* CHPS=0    */
      0x5b, 0x76,       /* GAINU=118 */
      0x5c, 0xa5,       /* GAINV=165 */
      0x5d, 0x3c,       /* BLCKL=60  */
      0x5e, 0x3a,       /* BLNNL=58  */
      0x5f, 0x3a,       /* CCRS=0, BLNVB=58 */
      0x60, 0x00,       /* NULL      */

      /* 0x61 - 0x66 set according to norm */

      0x67, 0x00,       /* 0 : caption 1st byte odd  field */
      0x68, 0x00,       /* 0 : caption 2nd byte odd  field */
      0x69, 0x00,       /* 0 : caption 1st byte even field */
      0x6a, 0x00,       /* 0 : caption 2nd byte even field */

      0x6b, 0x91,       /* MODIN=2, PCREF=0, SCCLN=17 */
      0x6c, 0x20,       /* SRCV1=0, TRCV2=1, ORCV1=0, PRCV1=0,
                         * CBLF=0, ORCV2=0, PRCV2=0 */
      0x6d, 0x00,       /* SRCM1=0, CCEN=0 */

      0x6e, 0x0e,       /* HTRIG=0x005, approx. centered, at
                         * least for PAL */
      0x6f, 0x00,       /* HTRIG upper bits */
      0x70, 0x20,       /* PHRES=0, SBLN=1, VTRIG=0 */

      /* The following should not be needed */

      0x71, 0x15,       /* BMRQ=0x115 */
      0x72, 0x90,       /* EMRQ=0x690 */
      0x73, 0x61,       /* EMRQ=0x690, BMRQ=0x115 */
      0x74, 0x00,       /* NULL       */
      0x75, 0x00,       /* NULL       */
      0x76, 0x00,       /* NULL       */
      0x77, 0x15,       /* BRCV=0x115 */
      0x78, 0x90,       /* ERCV=0x690 */
      0x79, 0x61,       /* ERCV=0x690, BRCV=0x115 */

      /* Field length controls */

      0x7a, 0x70,       /* FLC=0 */

      /* The following should not be needed if SBLN = 1 */

      0x7b, 0x16,       /* FAL=22 */
      0x7c, 0x35,       /* LAL=244 */
      0x7d, 0x20,       /* LAL=244, FAL=22 */
};

static const unsigned char init_pal[] = {
      0x61, 0x1e,       /* FISE=0, PAL=1, SCBW=1, RTCE=1,
                         * YGS=1, INPI=0, DOWN=0 */
      0x62, 0xc8,       /* DECTYP=1, BSTA=72 */
      0x63, 0xcb,       /* FSC0 */
      0x64, 0x8a,       /* FSC1 */
      0x65, 0x09,       /* FSC2 */
      0x66, 0x2a,       /* FSC3 */
};

static const unsigned char init_ntsc[] = {
      0x61, 0x1d,       /* FISE=1, PAL=0, SCBW=1, RTCE=1,
                         * YGS=1, INPI=0, DOWN=0 */
      0x62, 0xe6,       /* DECTYP=1, BSTA=102 */
      0x63, 0x1f,       /* FSC0 */
      0x64, 0x7c,       /* FSC1 */
      0x65, 0xf0,       /* FSC2 */
      0x66, 0x21,       /* FSC3 */
};

static int
saa7185_command (struct i2c_client *client,
             unsigned int       cmd,
             void              *arg)
{
      struct saa7185 *encoder = i2c_get_clientdata(client);

      switch (cmd) {

      case 0:
            saa7185_write_block(client, init_common,
                            sizeof(init_common));
            switch (encoder->norm) {

            case VIDEO_MODE_NTSC:
                  saa7185_write_block(client, init_ntsc,
                                  sizeof(init_ntsc));
                  break;

            case VIDEO_MODE_PAL:
                  saa7185_write_block(client, init_pal,
                                  sizeof(init_pal));
                  break;
            }

            break;

      case ENCODER_GET_CAPABILITIES:
      {
            struct video_encoder_capability *cap = arg;

            cap->flags =
                VIDEO_ENCODER_PAL | VIDEO_ENCODER_NTSC |
                VIDEO_ENCODER_SECAM | VIDEO_ENCODER_CCIR;
            cap->inputs = 1;
            cap->outputs = 1;
      }
            break;

      case ENCODER_SET_NORM:
      {
            int *iarg = arg;

            //saa7185_write_block(client, init_common, sizeof(init_common));

            switch (*iarg) {

            case VIDEO_MODE_NTSC:
                  saa7185_write_block(client, init_ntsc,
                                  sizeof(init_ntsc));
                  break;

            case VIDEO_MODE_PAL:
                  saa7185_write_block(client, init_pal,
                                  sizeof(init_pal));
                  break;

            case VIDEO_MODE_SECAM:
            default:
                  return -EINVAL;

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

      case ENCODER_SET_INPUT:
      {
            int *iarg = arg;

            /* RJ: *iarg = 0: input is from SA7111
             *iarg = 1: input is from ZR36060 */

            switch (*iarg) {

            case 0:
                  /* Switch RTCE to 1 */
                  saa7185_write(client, 0x61,
                              (encoder->reg[0x61] & 0xf7) | 0x08);
                  saa7185_write(client, 0x6e, 0x01);
                  break;

            case 1:
                  /* Switch RTCE to 0 */
                  saa7185_write(client, 0x61,
                              (encoder->reg[0x61] & 0xf7) | 0x00);
                  /* SW: a slight sync problem... */
                  saa7185_write(client, 0x6e, 0x00);
                  break;

            default:
                  return -EINVAL;

            }
      }
            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;
            saa7185_write(client, 0x61,
                        (encoder->reg[0x61] & 0xbf) |
                        (encoder->enable ? 0x00 : 0x40));
      }
            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_SAA7185 >> 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_saa7185;

static int
saa7185_detect_client (struct i2c_adapter *adapter,
                   int                 address,
                   int                 kind)
{
      int i;
      struct i2c_client *client;
      struct saa7185 *encoder;

      dprintk(1,
            KERN_INFO
            "saa7185.c: detecting saa7185 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_saa7185;
      strlcpy(I2C_NAME(client), "saa7185", sizeof(I2C_NAME(client)));

      encoder = kzalloc(sizeof(struct saa7185), GFP_KERNEL);
      if (encoder == NULL) {
            kfree(client);
            return -ENOMEM;
      }
      encoder->norm = VIDEO_MODE_NTSC;
      encoder->enable = 1;
      i2c_set_clientdata(client, encoder);

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

      i = saa7185_write_block(client, init_common, sizeof(init_common));
      if (i >= 0) {
            i = saa7185_write_block(client, init_ntsc,
                              sizeof(init_ntsc));
      }
      if (i < 0) {
            dprintk(1, KERN_ERR "%s_attach: init error %d\n",
                  I2C_NAME(client), i);
      } else {
            dprintk(1,
                  KERN_INFO
                  "%s_attach: chip version %d at address 0x%x\n",
                  I2C_NAME(client), saa7185_read(client) >> 5,
                  client->addr << 1);
      }

      return 0;
}

static int
saa7185_attach_adapter (struct i2c_adapter *adapter)
{
      dprintk(1,
            KERN_INFO
            "saa7185.c: starting probe for adapter %s (0x%x)\n",
            I2C_NAME(adapter), adapter->id);
      return i2c_probe(adapter, &addr_data, &saa7185_detect_client);
}

static int
saa7185_detach_client (struct i2c_client *client)
{
      struct saa7185 *encoder = i2c_get_clientdata(client);
      int err;

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

      saa7185_write(client, 0x61, (encoder->reg[0x61]) | 0x40);   /* SW: output off is active */
      //saa7185_write(client, 0x3a, (encoder->reg[0x3a]) | 0x80); /* SW: color bar */

      kfree(encoder);
      kfree(client);

      return 0;
}

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

static struct i2c_driver i2c_driver_saa7185 = {
      .driver = {
            .name = "saa7185",      /* name */
      },

      .id = I2C_DRIVERID_SAA7185B,

      .attach_adapter = saa7185_attach_adapter,
      .detach_client = saa7185_detach_client,
      .command = saa7185_command,
};

static int __init
saa7185_init (void)
{
      return i2c_add_driver(&i2c_driver_saa7185);
}

static void __exit
saa7185_exit (void)
{
      i2c_del_driver(&i2c_driver_saa7185);
}

module_init(saa7185_init);
module_exit(saa7185_exit);

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