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/*

 * upd64031A - NEC Electronics Ghost Reduction for NTSC in Japan

 *

 * 2003 by T.Adachi <tadachi@tadachi-net.com>

 * 2003 by Takeru KOMORIYA <komoriya@paken.org>

 * 2006 by Hans Verkuil <hverkuil@xs4all.nl>

 *

 * 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/version.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/i2c.h>

#include <linux/videodev2.h>

#include <media/v4l2-common.h>

#include <media/v4l2-chip-ident.h>

#include <media/upd64031a.h>

// --------------------- read registers functions define -----------------------

/* bit masks */

#define GR_MODE_MASK              0xc0

#define DIRECT_3DYCS_CONNECT_MASK 0xc0

#define SYNC_CIRCUIT_MASK         0xa0

// -----------------------------------------------------------------------------

MODULE_DESCRIPTION("uPD64031A driver");

MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");

MODULE_LICENSE("GPL");

static int debug = 0;

module_param(debug, int, 0644);

MODULE_PARM_DESC(debug, "Debug level (0-1)");

static unsigned short normal_i2c[] = { 0x24 >> 1, 0x26 >> 1, I2C_CLIENT_END };

I2C_CLIENT_INSMOD;

enum {

        R00 = 0, R01, R02, R03, R04,

        R05, R06, R07, R08, R09,

        R0A, R0B, R0C, R0D, R0E, R0F,

        /* unused registers

         R10, R11, R12, R13, R14,

         R15, R16, R17,

         */

        TOT_REGS

};

struct upd64031a_state {

        u8 regs[TOT_REGS];

        u8 gr_mode;

        u8 direct_3dycs_connect;

        u8 ext_comp_sync;

        u8 ext_vert_sync;

};

static u8 upd64031a_init[] = {

        0x00, 0xb8, 0x48, 0xd2, 0xe6,

        0x03, 0x10, 0x0b, 0xaf, 0x7f,

        0x00, 0x00, 0x1d, 0x5e, 0x00,

        0xd0

};

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

static u8 upd64031a_read(struct i2c_client *client, u8 reg)

{

        u8 buf[2];

        if (reg >= sizeof(buf))

                return 0xff;

        i2c_master_recv(client, buf, 2);

        return buf[reg];

}

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

static void upd64031a_write(struct i2c_client *client, u8 reg, u8 val)

{

        u8 buf[2];

        buf[0] = reg;

        buf[1] = val;

        v4l_dbg(1, debug, client, "writing reg addr: %02X val: %02X\n", reg, val);

        if (i2c_master_send(client, buf, 2) != 2)

                v4l_err(client, "I/O error write 0x%02x/0x%02x\n", reg, val);

}

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

/* The input changed due to new input or channel changed */

static void upd64031a_change(struct i2c_client *client)

{

        struct upd64031a_state *state = i2c_get_clientdata(client);

        u8 reg = state->regs[R00];

        v4l_dbg(1, debug, client, "changed input or channel\n");

        upd64031a_write(client, R00, reg | 0x10);

        upd64031a_write(client, R00, reg & ~0x10);

}

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

static int upd64031a_command(struct i2c_client *client, unsigned int cmd, void *arg)

{

        struct upd64031a_state *state = i2c_get_clientdata(client);

        struct v4l2_routing *route = arg;

        switch (cmd) {

        case VIDIOC_S_FREQUENCY:

                upd64031a_change(client);

                break;

        case VIDIOC_INT_G_VIDEO_ROUTING:

                route->input = (state->gr_mode >> 6) |

                        (state->direct_3dycs_connect >> 4) |

                        (state->ext_comp_sync >> 1) |

                        (state->ext_vert_sync >> 2);

                route->output = 0;

                break;

        case VIDIOC_INT_S_VIDEO_ROUTING:

        {

                u8 r00, r05, r08;

                state->gr_mode = (route->input & 3) << 6;

                state->direct_3dycs_connect = (route->input & 0xc) << 4;

                state->ext_comp_sync = (route->input & UPD64031A_COMPOSITE_EXTERNAL) << 1;

                state->ext_vert_sync = (route->input & UPD64031A_VERTICAL_EXTERNAL) << 2;

                r00 = (state->regs[R00] & ~GR_MODE_MASK) | state->gr_mode;

                r05 = (state->regs[R00] & ~SYNC_CIRCUIT_MASK) |

                        state->ext_comp_sync | state->ext_vert_sync;

                r08 = (state->regs[R08] & ~DIRECT_3DYCS_CONNECT_MASK) |

                        state->direct_3dycs_connect;

                upd64031a_write(client, R00, r00);

                upd64031a_write(client, R05, r05);

                upd64031a_write(client, R08, r08);

                upd64031a_change(client);

                break;

        }

        case VIDIOC_LOG_STATUS:

                v4l_info(client, "Status: SA00=0x%02x SA01=0x%02x\n",

                        upd64031a_read(client, 0), upd64031a_read(client, 1));

                break;

#ifdef CONFIG_VIDEO_ADV_DEBUG

        case VIDIOC_DBG_G_REGISTER:

        case VIDIOC_DBG_S_REGISTER:

        {

                struct v4l2_register *reg = arg;

                if (!v4l2_chip_match_i2c_client(client, reg->match_type, reg->match_chip))

                        return -EINVAL;

                if (!capable(CAP_SYS_ADMIN))

                        return -EPERM;

                if (cmd == VIDIOC_DBG_G_REGISTER)

                        reg->val = upd64031a_read(client, reg->reg & 0xff);

                else

                        upd64031a_write(client, reg->reg & 0xff, reg->val & 0xff);

                break;

        }

#endif

        case VIDIOC_G_CHIP_IDENT:

                return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_UPD64031A, 0);

        default:

                break;

        }

        return 0;

}

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

/* i2c implementation */

static struct i2c_driver i2c_driver;

static int upd64031a_attach(struct i2c_adapter *adapter, int address, int kind)

{

        struct i2c_client *client;

        struct upd64031a_state *state;

        int i;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

                return 0;

        client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);

        if (client == NULL) {

                return -ENOMEM;

        }

        client->addr = address;

        client->adapter = adapter;

        client->driver = &i2c_driver;

        snprintf(client->name, sizeof(client->name) - 1, "uPD64031A");

        v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);

        state = kmalloc(sizeof(struct upd64031a_state), GFP_KERNEL);

        if (state == NULL) {

                kfree(client);

                return -ENOMEM;

        }

        i2c_set_clientdata(client, state);

        memcpy(state->regs, upd64031a_init, sizeof(state->regs));

        state->gr_mode = UPD64031A_GR_ON << 6;

        state->direct_3dycs_connect = UPD64031A_3DYCS_COMPOSITE << 4;

        state->ext_comp_sync = state->ext_vert_sync = 0;

        for (i = 0; i < TOT_REGS; i++) {

                upd64031a_write(client, i, state->regs[i]);

        }

        i2c_attach_client(client);

        return 0;

}

static int upd64031a_probe(struct i2c_adapter *adapter)

{

        if (adapter->class & I2C_CLASS_TV_ANALOG)

                return i2c_probe(adapter, &addr_data, upd64031a_attach);

        return 0;

}

static int upd64031a_detach(struct i2c_client *client)

{

        int err;

        err = i2c_detach_client(client);

        if (err)

                return err;

        kfree(client);

        return 0;

}

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

/* i2c implementation */

static struct i2c_driver i2c_driver = {

        .driver = {

                .name = "upd64031a",

        },

        .id = I2C_DRIVERID_UPD64031A,

        .attach_adapter = upd64031a_probe,

        .detach_client  = upd64031a_detach,

        .command = upd64031a_command,

};

static int __init upd64031a_init_module(void)

{

        return i2c_add_driver(&i2c_driver);

}

static void __exit upd64031a_exit_module(void)

{

        i2c_del_driver(&i2c_driver);

}

module_init(upd64031a_init_module);

module_exit(upd64031a_exit_module);