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/*

 * upd6408x - NEC Electronics 3-Dimensional Y/C separation driver

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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/upd64083.h>

MODULE_DESCRIPTION("uPD64083 driver");

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

MODULE_LICENSE("GPL");

static int debug = 0;

module_param(debug, bool, 0644);

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

static unsigned short normal_i2c[] = { 0xb8 >> 1, 0xba >> 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,

        R10, R11, R12, R13, R14,

        R15, R16,

        TOT_REGS

};

struct upd64083_state {

        u8 mode;

        u8 ext_y_adc;

        u8 regs[TOT_REGS];

};

/* Initial values when used in combination with the

   NEC upd64031a ghost reduction chip. */

static u8 upd64083_init[] = {

        0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */

        0x36, 0xdd, 0x05, 0x56, 0x48,

        0x00, 0x3a, 0xa0, 0x05, 0x08,

        0x44, 0x60, 0x08, 0x52, 0xf8,

        0x53, 0x60, 0x10

};

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

static void upd64083_log_status(struct i2c_client *client)

{

        u8 buf[7];

        i2c_master_recv(client, buf, 7);

        v4l_info(client, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "

                      "SA04=%02x SA05=%02x SA06=%02x\n",

                buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);

}

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

static void upd64083_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);

}

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

#ifdef CONFIG_VIDEO_ADV_DEBUG

static u8 upd64083_read(struct i2c_client *client, u8 reg)

{

        u8 buf[7];

        if (reg >= sizeof(buf))

                return 0xff;

        i2c_master_recv(client, buf, sizeof(buf));

        return buf[reg];

}

#endif

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

static int upd64083_command(struct i2c_client *client, unsigned int cmd, void *arg)

{

        struct upd64083_state *state = i2c_get_clientdata(client);

        struct v4l2_routing *route = arg;

        switch (cmd) {

        case VIDIOC_INT_G_VIDEO_ROUTING:

                route->input = (state->mode >> 6) | (state->ext_y_adc >> 3);

                route->output = 0;

                break;

        case VIDIOC_INT_S_VIDEO_ROUTING:

        {

                u8 r00, r02;

                if (route->input > 7 || (route->input & 6) == 6)

                        return -EINVAL;

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

                state->ext_y_adc = (route->input & UPD64083_EXT_Y_ADC) << 3;

                r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;

                r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;

                upd64083_write(client, R00, r00);

                upd64083_write(client, R02, r02);

                break;

        }

        case VIDIOC_LOG_STATUS:

                upd64083_log_status(client);

                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 = upd64083_read(client, reg->reg & 0xff);

                else

                        upd64083_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_UPD64083, 0);

        default:

                break;

        }

        return 0;

}

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

/* i2c implementation */

static struct i2c_driver i2c_driver;

static int upd64083_attach(struct i2c_adapter *adapter, int address, int kind)

{

        struct i2c_client *client;

        struct upd64083_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, "uPD64083");

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

        state = kmalloc(sizeof(struct upd64083_state), GFP_KERNEL);

        if (state == NULL) {

                kfree(client);

                return -ENOMEM;

        }

        i2c_set_clientdata(client, state);

        /* Initially assume that a ghost reduction chip is present */

        state->mode = 0;  /* YCS mode */

        state->ext_y_adc = (1 << 5);

        memcpy(state->regs, upd64083_init, TOT_REGS);

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

                upd64083_write(client, i, state->regs[i]);

        }

        i2c_attach_client(client);

        return 0;

}

static int upd64083_probe(struct i2c_adapter *adapter)

{

        if (adapter->class & I2C_CLASS_TV_ANALOG)

                return i2c_probe(adapter, &addr_data, upd64083_attach);

        return 0;

}

static int upd64083_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 = "upd64083",

        },

        .id = I2C_DRIVERID_UPD64083,

        .attach_adapter = upd64083_probe,

        .detach_client  = upd64083_detach,

        .command = upd64083_command,

};

static int __init upd64083_init_module(void)

{

        return i2c_add_driver(&i2c_driver);

}

static void __exit upd64083_exit_module(void)

{

        i2c_del_driver(&i2c_driver);

}

module_init(upd64083_init_module);

module_exit(upd64083_exit_module);