wis-tw9903.c

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/*
 * Copyright (C) 2005-2006 Micronas USA Inc.
 *
 * 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.
 *
 * 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., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <linux/ioctl.h>
#include <linux/slab.h>

#include "wis-i2c.h"

struct wis_tw9903 {
    int norm;
    int brightness;
    int contrast;
    int hue;
};

static u8 initial_registers[] =
{
    0x02, 0x44, /* input 1, composite */
    0x03, 0x92, /* correct digital format */
    0x04, 0x00,
    0x05, 0x80, /* or 0x00 for PAL */
    0x06, 0x40, /* second internal current reference */
    0x07, 0x02, /* window */
    0x08, 0x14, /* window */
    0x09, 0xf0, /* window */
    0x0a, 0x81, /* window */
    0x0b, 0xd0, /* window */
    0x0c, 0x8c,
    0x0d, 0x00, /* scaling */
    0x0e, 0x11, /* scaling */
    0x0f, 0x00, /* scaling */
    0x10, 0x00, /* brightness */
    0x11, 0x60, /* contrast */
    0x12, 0x01, /* sharpness */
    0x13, 0x7f, /* U gain */
    0x14, 0x5a, /* V gain */
    0x15, 0x00, /* hue */
    0x16, 0xc3, /* sharpness */
    0x18, 0x00,
    0x19, 0x58, /* vbi */
    0x1a, 0x80,
    0x1c, 0x0f, /* video norm */
    0x1d, 0x7f, /* video norm */
    0x20, 0xa0, /* clamping gain (working 0x50) */
    0x21, 0x22,
    0x22, 0xf0,
    0x23, 0xfe,
    0x24, 0x3c,
    0x25, 0x38,
    0x26, 0x44,
    0x27, 0x20,
    0x28, 0x00,
    0x29, 0x15,
    0x2a, 0xa0,
    0x2b, 0x44,
    0x2c, 0x37,
    0x2d, 0x00,
    0x2e, 0xa5, /* burst PLL control (working: a9) */
    0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */
    0x31, 0x00,
    0x33, 0x22,
    0x34, 0x11,
    0x35, 0x35,
    0x3b, 0x05,
    0x06, 0xc0, /* reset device */
    0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
};

static int write_reg(struct i2c_client *client, u8 reg, u8 value)
{
    return i2c_smbus_write_byte_data(client, reg, value);
}

static int write_regs(struct i2c_client *client, u8 *regs)
{
    int i;

    for (i = 0; regs[i] != 0x00; i += 2)
        if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
            return -1;
    return 0;
}

static int wis_tw9903_command(struct i2c_client *client,
                unsigned int cmd, void *arg)
{
    struct wis_tw9903 *dec = i2c_get_clientdata(client);

    switch (cmd) {
    case VIDIOC_S_INPUT:
    {
        int *input = arg;

        i2c_smbus_write_byte_data(client, 0x02, 0x40 | (*input << 1));
        break;
    }
#if 0
    /* The scaler on this thing seems to be horribly broken */
    case DECODER_SET_RESOLUTION:
    {
        struct video_decoder_resolution *res = arg;
        /*int hscale = 256 * 720 / res->width;*/
        int hscale = 256 * 720 / (res->width - (res->width > 704 ? 0 : 8));
        int vscale = 256 * (dec->norm & V4L2_STD_NTSC ?  240 : 288)
                / res->height;
        u8 regs[] = {
            0x0d, vscale & 0xff,
            0x0f, hscale & 0xff,
            0x0e, ((vscale & 0xf00) >> 4) | ((hscale & 0xf00) >> 8),
            0x06, 0xc0, /* reset device */
            0,  0,
        };
        printk(KERN_DEBUG "vscale is %04x, hscale is %04x\n",
                vscale, hscale);
        /*write_regs(client, regs);*/
        break;
    }
#endif
    case VIDIOC_S_STD:
    {
        v4l2_std_id *input = arg;
        u8 regs[] = {
            0x05, *input & V4L2_STD_NTSC ? 0x80 : 0x00,
            0x07, *input & V4L2_STD_NTSC ? 0x02 : 0x12,
            0x08, *input & V4L2_STD_NTSC ? 0x14 : 0x18,
            0x09, *input & V4L2_STD_NTSC ? 0xf0 : 0x20,
            0,  0,
        };
        write_regs(client, regs);
        dec->norm = *input;
        break;
    }
    case VIDIOC_QUERYCTRL:
    {
        struct v4l2_queryctrl *ctrl = arg;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Brightness", sizeof(ctrl->name));
            ctrl->minimum = -128;
            ctrl->maximum = 127;
            ctrl->step = 1;
            ctrl->default_value = 0x00;
            ctrl->flags = 0;
            break;
        case V4L2_CID_CONTRAST:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Contrast", sizeof(ctrl->name));
            ctrl->minimum = 0;
            ctrl->maximum = 255;
            ctrl->step = 1;
            ctrl->default_value = 0x60;
            ctrl->flags = 0;
            break;
#if 0
        /* I don't understand how the Chroma Gain registers work... */
        case V4L2_CID_SATURATION:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Saturation", sizeof(ctrl->name));
            ctrl->minimum = 0;
            ctrl->maximum = 127;
            ctrl->step = 1;
            ctrl->default_value = 64;
            ctrl->flags = 0;
            break;
#endif
        case V4L2_CID_HUE:
            ctrl->type = V4L2_CTRL_TYPE_INTEGER;
            strncpy(ctrl->name, "Hue", sizeof(ctrl->name));
            ctrl->minimum = -128;
            ctrl->maximum = 127;
            ctrl->step = 1;
            ctrl->default_value = 0;
            ctrl->flags = 0;
            break;
        }
        break;
    }
    case VIDIOC_S_CTRL:
    {
        struct v4l2_control *ctrl = arg;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
            if (ctrl->value > 127)
                dec->brightness = 127;
            else if (ctrl->value < -128)
                dec->brightness = -128;
            else
                dec->brightness = ctrl->value;
            write_reg(client, 0x10, dec->brightness);
            break;
        case V4L2_CID_CONTRAST:
            if (ctrl->value > 255)
                dec->contrast = 255;
            else if (ctrl->value < 0)
                dec->contrast = 0;
            else
                dec->contrast = ctrl->value;
            write_reg(client, 0x11, dec->contrast);
            break;
#if 0
        case V4L2_CID_SATURATION:
            if (ctrl->value > 127)
                dec->saturation = 127;
            else if (ctrl->value < 0)
                dec->saturation = 0;
            else
                dec->saturation = ctrl->value;
            /*write_reg(client, 0x0c, dec->saturation);*/
            break;
#endif
        case V4L2_CID_HUE:
            if (ctrl->value > 127)
                dec->hue = 127;
            else if (ctrl->value < -128)
                dec->hue = -128;
            else
                dec->hue = ctrl->value;
            write_reg(client, 0x15, dec->hue);
            break;
        }
        break;
    }
    case VIDIOC_G_CTRL:
    {
        struct v4l2_control *ctrl = arg;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
            ctrl->value = dec->brightness;
            break;
        case V4L2_CID_CONTRAST:
            ctrl->value = dec->contrast;
            break;
#if 0
        case V4L2_CID_SATURATION:
            ctrl->value = dec->saturation;
            break;
#endif
        case V4L2_CID_HUE:
            ctrl->value = dec->hue;
            break;
        }
        break;
    }
    default:
        break;
    }
    return 0;
}

static int wis_tw9903_probe(struct i2c_client *client,
                const struct i2c_device_id *id)
{
    struct i2c_adapter *adapter = client->adapter;
    struct wis_tw9903 *dec;

    if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
        return -ENODEV;

    dec = kmalloc(sizeof(struct wis_tw9903), GFP_KERNEL);
    if (dec == NULL)
        return -ENOMEM;

    dec->norm = V4L2_STD_NTSC;
    dec->brightness = 0;
    dec->contrast = 0x60;
    dec->hue = 0;
    i2c_set_clientdata(client, dec);

    printk(KERN_DEBUG
        "wis-tw9903: initializing TW9903 at address %d on %s\n",
        client->addr, adapter->name);

    if (write_regs(client, initial_registers) < 0) {
        printk(KERN_ERR "wis-tw9903: error initializing TW9903\n");
        kfree(dec);
        return -ENODEV;
    }

    return 0;
}

static int wis_tw9903_remove(struct i2c_client *client)
{
    struct wis_tw9903 *dec = i2c_get_clientdata(client);

    kfree(dec);
    return 0;
}

static const struct i2c_device_id wis_tw9903_id[] = {
    { "wis_tw9903", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wis_tw9903_id);

static struct i2c_driver wis_tw9903_driver = {
    .driver = {
        .name   = "WIS TW9903 I2C driver",
    },
    .probe      = wis_tw9903_probe,
    .remove     = wis_tw9903_remove,
    .command    = wis_tw9903_command,
    .id_table   = wis_tw9903_id,
};

static int __init wis_tw9903_init(void)
{
    return i2c_add_driver(&wis_tw9903_driver);
}

static void __exit wis_tw9903_cleanup(void)
{
    i2c_del_driver(&wis_tw9903_driver);
}

module_init(wis_tw9903_init);
module_exit(wis_tw9903_cleanup);

MODULE_LICENSE("GPL v2");