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indycam.c

/*
 *  indycam.c - Silicon Graphics IndyCam digital camera driver
 *
 *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
 *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/slab.h>

#include <linux/videodev.h>
/* IndyCam decodes stream of photons into digital image representation ;-) */
#include <linux/video_decoder.h>
#include <linux/i2c.h>

#include "indycam.h"

#define INDYCAM_MODULE_VERSION "0.0.5"

MODULE_DESCRIPTION("SGI IndyCam driver");
MODULE_VERSION(INDYCAM_MODULE_VERSION);
MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
MODULE_LICENSE("GPL");

// #define INDYCAM_DEBUG

#ifdef INDYCAM_DEBUG
#define dprintk(x...) printk("IndyCam: " x);
#define indycam_regdump(client) indycam_regdump_debug(client)
#else
#define dprintk(x...)
#define indycam_regdump(client)
#endif

struct indycam {
      struct i2c_client *client;
      u8 version;
};

static struct i2c_driver i2c_driver_indycam;

static const u8 initseq[] = {
      INDYCAM_CONTROL_AGCENA,       /* INDYCAM_CONTROL */
      INDYCAM_SHUTTER_60,           /* INDYCAM_SHUTTER */
      INDYCAM_GAIN_DEFAULT,         /* INDYCAM_GAIN */
      0x00,                   /* INDYCAM_BRIGHTNESS (read-only) */
      INDYCAM_RED_BALANCE_DEFAULT,  /* INDYCAM_RED_BALANCE */
      INDYCAM_BLUE_BALANCE_DEFAULT, /* INDYCAM_BLUE_BALANCE */
      INDYCAM_RED_SATURATION_DEFAULT,     /* INDYCAM_RED_SATURATION */
      INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
};

/* IndyCam register handling */

static int indycam_read_reg(struct i2c_client *client, u8 reg, u8 *value)
{
      int ret;

      if (reg == INDYCAM_REG_RESET) {
            dprintk("indycam_read_reg(): "
                  "skipping write-only register %d\n", reg);
            *value = 0;
            return 0;
      }

      ret = i2c_smbus_read_byte_data(client, reg);

      if (ret < 0) {
            printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
                   "register = 0x%02x\n", reg);
            return ret;
      }

      *value = (u8)ret;

      return 0;
}

static int indycam_write_reg(struct i2c_client *client, u8 reg, u8 value)
{
      int err;

      if ((reg == INDYCAM_REG_BRIGHTNESS)
          || (reg == INDYCAM_REG_VERSION)) {
            dprintk("indycam_write_reg(): "
                  "skipping read-only register %d\n", reg);
            return 0;
      }

      dprintk("Writing Reg %d = 0x%02x\n", reg, value);
      err = i2c_smbus_write_byte_data(client, reg, value);

      if (err) {
            printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
                   "register = 0x%02x, value = 0x%02x\n", reg, value);
      }
      return err;
}

static int indycam_write_block(struct i2c_client *client, u8 reg,
                         u8 length, u8 *data)
{
      int i, err;

      for (i = 0; i < length; i++) {
            err = indycam_write_reg(client, reg + i, data[i]);
            if (err)
                  return err;
      }

      return 0;
}

/* Helper functions */

#ifdef INDYCAM_DEBUG
static void indycam_regdump_debug(struct i2c_client *client)
{
      int i;
      u8 val;

      for (i = 0; i < 9; i++) {
            indycam_read_reg(client, i, &val);
            dprintk("Reg %d = 0x%02x\n", i, val);
      }
}
#endif

static int indycam_get_control(struct i2c_client *client,
                         struct indycam_control *ctrl)
{
      struct indycam *camera = i2c_get_clientdata(client);
      u8 reg;
      int ret = 0;

      switch (ctrl->type) {
      case INDYCAM_CONTROL_AGC:
      case INDYCAM_CONTROL_AWB:
            ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, &reg);
            if (ret)
                  return -EIO;
            if (ctrl->type == INDYCAM_CONTROL_AGC)
                  ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
                        ? 1 : 0;
            else
                  ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
                        ? 1 : 0;
            break;
      case INDYCAM_CONTROL_SHUTTER:
            ret = indycam_read_reg(client, INDYCAM_REG_SHUTTER, &reg);
            if (ret)
                  return -EIO;
            ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
            break;
      case INDYCAM_CONTROL_GAIN:
            ret = indycam_read_reg(client, INDYCAM_REG_GAIN, &reg);
            if (ret)
                  return -EIO;
            ctrl->value = (s32)reg;
            break;
      case INDYCAM_CONTROL_RED_BALANCE:
            ret = indycam_read_reg(client, INDYCAM_REG_RED_BALANCE, &reg);
            if (ret)
                  return -EIO;
            ctrl->value = (s32)reg;
            break;
      case INDYCAM_CONTROL_BLUE_BALANCE:
            ret = indycam_read_reg(client, INDYCAM_REG_BLUE_BALANCE, &reg);
            if (ret)
                  return -EIO;
            ctrl->value = (s32)reg;
            break;
      case INDYCAM_CONTROL_RED_SATURATION:
            ret = indycam_read_reg(client,
                               INDYCAM_REG_RED_SATURATION, &reg);
            if (ret)
                  return -EIO;
            ctrl->value = (s32)reg;
            break;
      case INDYCAM_CONTROL_BLUE_SATURATION:
            ret = indycam_read_reg(client,
                               INDYCAM_REG_BLUE_SATURATION, &reg);
            if (ret)
                  return -EIO;
            ctrl->value = (s32)reg;
            break;
      case INDYCAM_CONTROL_GAMMA:
            if (camera->version == CAMERA_VERSION_MOOSE) {
                  ret = indycam_read_reg(client,
                                     INDYCAM_REG_GAMMA, &reg);
                  if (ret)
                        return -EIO;
                  ctrl->value = (s32)reg;
            } else {
                  ctrl->value = INDYCAM_GAMMA_DEFAULT;
            }
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

static int indycam_set_control(struct i2c_client *client,
                         struct indycam_control *ctrl)
{
      struct indycam *camera = i2c_get_clientdata(client);
      u8 reg;
      int ret = 0;

      switch (ctrl->type) {
      case INDYCAM_CONTROL_AGC:
      case INDYCAM_CONTROL_AWB:
            ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, &reg);
            if (ret)
                  break;

            if (ctrl->type == INDYCAM_CONTROL_AGC) {
                  if (ctrl->value)
                        reg |= INDYCAM_CONTROL_AGCENA;
                  else
                        reg &= ~INDYCAM_CONTROL_AGCENA;
            } else {
                  if (ctrl->value)
                        reg |= INDYCAM_CONTROL_AWBCTL;
                  else
                        reg &= ~INDYCAM_CONTROL_AWBCTL;
            }

            ret = indycam_write_reg(client, INDYCAM_REG_CONTROL, reg);
            break;
      case INDYCAM_CONTROL_SHUTTER:
            reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
            ret = indycam_write_reg(client, INDYCAM_REG_SHUTTER, reg);
            break;
      case INDYCAM_CONTROL_GAIN:
            ret = indycam_write_reg(client, INDYCAM_REG_GAIN, ctrl->value);
            break;
      case INDYCAM_CONTROL_RED_BALANCE:
            ret = indycam_write_reg(client, INDYCAM_REG_RED_BALANCE,
                              ctrl->value);
            break;
      case INDYCAM_CONTROL_BLUE_BALANCE:
            ret = indycam_write_reg(client, INDYCAM_REG_BLUE_BALANCE,
                              ctrl->value);
            break;
      case INDYCAM_CONTROL_RED_SATURATION:
            ret = indycam_write_reg(client, INDYCAM_REG_RED_SATURATION,
                              ctrl->value);
            break;
      case INDYCAM_CONTROL_BLUE_SATURATION:
            ret = indycam_write_reg(client, INDYCAM_REG_BLUE_SATURATION,
                              ctrl->value);
            break;
      case INDYCAM_CONTROL_GAMMA:
            if (camera->version == CAMERA_VERSION_MOOSE) {
                  ret = indycam_write_reg(client, INDYCAM_REG_GAMMA,
                                    ctrl->value);
            }
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

/* I2C-interface */

static int indycam_attach(struct i2c_adapter *adap, int addr, int kind)
{
      int err = 0;
      struct indycam *camera;
      struct i2c_client *client;

      printk(KERN_INFO "SGI IndyCam driver version %s\n",
             INDYCAM_MODULE_VERSION);

      client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
      if (!client)
            return -ENOMEM;
      camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
      if (!camera) {
            err = -ENOMEM;
            goto out_free_client;
      }

      client->addr = addr;
      client->adapter = adap;
      client->driver = &i2c_driver_indycam;
      client->flags = 0;
      strcpy(client->name, "IndyCam client");
      i2c_set_clientdata(client, camera);

      camera->client = client;

      err = i2c_attach_client(client);
      if (err)
            goto out_free_camera;

      camera->version = i2c_smbus_read_byte_data(client,
                                       INDYCAM_REG_VERSION);
      if (camera->version != CAMERA_VERSION_INDY &&
          camera->version != CAMERA_VERSION_MOOSE) {
            err = -ENODEV;
            goto out_detach_client;
      }
      printk(KERN_INFO "IndyCam v%d.%d detected\n",
             INDYCAM_VERSION_MAJOR(camera->version),
             INDYCAM_VERSION_MINOR(camera->version));

      indycam_regdump(client);

      // initialize
      err = indycam_write_block(client, 0, sizeof(initseq), (u8 *)&initseq);
      if (err) {
            printk(KERN_ERR "IndyCam initalization failed\n");
            err = -EIO;
            goto out_detach_client;
      }

      indycam_regdump(client);

      // white balance
      err = indycam_write_reg(client, INDYCAM_REG_CONTROL,
                    INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
      if (err) {
            printk(KERN_ERR "IndyCam: White balancing camera failed\n");
            err = -EIO;
            goto out_detach_client;
      }

      indycam_regdump(client);

      printk(KERN_INFO "IndyCam initialized\n");

      return 0;

out_detach_client:
      i2c_detach_client(client);
out_free_camera:
      kfree(camera);
out_free_client:
      kfree(client);
      return err;
}

static int indycam_probe(struct i2c_adapter *adap)
{
      /* Indy specific crap */
      if (adap->id == I2C_HW_SGI_VINO)
            return indycam_attach(adap, INDYCAM_ADDR, 0);
      /* Feel free to add probe here :-) */
      return -ENODEV;
}

static int indycam_detach(struct i2c_client *client)
{
      struct indycam *camera = i2c_get_clientdata(client);

      i2c_detach_client(client);
      kfree(camera);
      kfree(client);
      return 0;
}

static int indycam_command(struct i2c_client *client, unsigned int cmd,
                     void *arg)
{
      // struct indycam *camera = i2c_get_clientdata(client);

      /* The old video_decoder interface just isn't enough,
       * so we'll use some custom commands. */
      switch (cmd) {
      case DECODER_GET_CAPABILITIES: {
            struct video_decoder_capability *cap = arg;

            cap->flags  = VIDEO_DECODER_NTSC;
            cap->inputs = 1;
            cap->outputs = 1;
            break;
      }
      case DECODER_GET_STATUS: {
            int *iarg = arg;

            *iarg = DECODER_STATUS_GOOD | DECODER_STATUS_NTSC |
                  DECODER_STATUS_COLOR;
            break;
      }
      case DECODER_SET_NORM: {
            int *iarg = arg;

            switch (*iarg) {
            case VIDEO_MODE_NTSC:
                  break;
            default:
                  return -EINVAL;
            }
            break;
      }
      case DECODER_SET_INPUT: {
            int *iarg = arg;

            if (*iarg != 0)
                  return -EINVAL;
            break;
      }
      case DECODER_SET_OUTPUT: {
            int *iarg = arg;

            if (*iarg != 0)
                  return -EINVAL;
            break;
      }
      case DECODER_ENABLE_OUTPUT: {
            /* Always enabled */
            break;
      }
      case DECODER_SET_PICTURE: {
            // struct video_picture *pic = arg;
            /* TODO: convert values for indycam_set_controls() */
            break;
      }
      case DECODER_INDYCAM_GET_CONTROL: {
            return indycam_get_control(client, arg);
      }
      case DECODER_INDYCAM_SET_CONTROL: {
            return indycam_set_control(client, arg);
      }
      default:
            return -EINVAL;
      }

      return 0;
}

static struct i2c_driver i2c_driver_indycam = {
      .driver = {
            .name       = "indycam",
      },
      .id         = I2C_DRIVERID_INDYCAM,
      .attach_adapter = indycam_probe,
      .detach_client    = indycam_detach,
      .command    = indycam_command,
};

static int __init indycam_init(void)
{
      return i2c_add_driver(&i2c_driver_indycam);
}

static void __exit indycam_exit(void)
{
      i2c_del_driver(&i2c_driver_indycam);
}

module_init(indycam_init);
module_exit(indycam_exit);

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