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/*

 * vp27smpx - driver version 0.0.1

 *

 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>

 *

 * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>

 * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>

 *

 * 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/types.h>

#include <linux/ioctl.h>

#include <asm/uaccess.h>

#include <linux/i2c.h>

#include <linux/i2c-id.h>

#include <linux/videodev.h>

#include <media/v4l2-common.h>

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

MODULE_DESCRIPTION("vp27smpx driver");

MODULE_AUTHOR("Hans Verkuil");

MODULE_LICENSE("GPL");

static unsigned short normal_i2c[] = { 0xb6 >> 1, I2C_CLIENT_END };

I2C_CLIENT_INSMOD;

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

struct vp27smpx_state {

        int radio;

        u32 audmode;

};

static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)

{

        struct vp27smpx_state *state = i2c_get_clientdata(client);

        u8 data[3] = { 0x00, 0x00, 0x04 };

        switch (audmode) {

                case V4L2_TUNER_MODE_MONO:

                case V4L2_TUNER_MODE_LANG1:

                        break;

                case V4L2_TUNER_MODE_STEREO:

                case V4L2_TUNER_MODE_LANG1_LANG2:

                        data[1] = 0x01;

                        break;

                case V4L2_TUNER_MODE_LANG2:

                        data[1] = 0x02;

                        break;

        }

        if (i2c_master_send(client, data, sizeof(data)) != sizeof(data)) {

                v4l_err(client, "%s: I/O error setting audmode\n", client->name);

        }

        else {

                state->audmode = audmode;

        }

}

static int vp27smpx_command(struct i2c_client *client, unsigned int cmd,

                          void *arg)

{

        struct vp27smpx_state *state = i2c_get_clientdata(client);

        struct v4l2_tuner *vt = arg;

        switch (cmd) {

        case AUDC_SET_RADIO:

                state->radio = 1;

                break;

        case VIDIOC_S_STD:

                state->radio = 0;

                break;

        case VIDIOC_S_TUNER:

                if (!state->radio)

                        vp27smpx_set_audmode(client, vt->audmode);

                break;

        case VIDIOC_G_TUNER:

                if (state->radio)

                        break;

                vt->audmode = state->audmode;

                vt->capability = V4L2_TUNER_CAP_STEREO |

                        V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;

                vt->rxsubchans = V4L2_TUNER_SUB_MONO;

                break;

        case VIDIOC_G_CHIP_IDENT:

                return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_VP27SMPX, 0);

        case VIDIOC_LOG_STATUS:

                v4l_info(client, "Audio Mode: %u%s\n", state->audmode,

                                state->radio ? " (Radio)" : "");

                break;

        default:

                return -EINVAL;

        }

        return 0;

}

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

/* i2c implementation */

/*

 * Generic i2c probe

 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'

 */

static struct i2c_driver i2c_driver;

static int vp27smpx_attach(struct i2c_adapter *adapter, int address, int kind)

{

        struct i2c_client *client;

        struct vp27smpx_state *state;

        /* 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;

        snprintf(client->name, sizeof(client->name) - 1, "vp27smpx");

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

        state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);

        if (state == NULL) {

                kfree(client);

                return -ENOMEM;

        }

        state->audmode = V4L2_TUNER_MODE_STEREO;

        i2c_set_clientdata(client, state);

        /* initialize vp27smpx */

        vp27smpx_set_audmode(client, state->audmode);

        i2c_attach_client(client);

        return 0;

}

static int vp27smpx_probe(struct i2c_adapter *adapter)

{

        if (adapter->class & I2C_CLASS_TV_ANALOG)

                return i2c_probe(adapter, &addr_data, vp27smpx_attach);

        return 0;

}

static int vp27smpx_detach(struct i2c_client *client)

{

        struct vp27smpx_state *state = i2c_get_clientdata(client);

        int err;

        err = i2c_detach_client(client);

        if (err) {

                return err;

        }

        kfree(state);

        kfree(client);

        return 0;

}

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

/* i2c implementation */

static struct i2c_driver i2c_driver = {

        .driver = {

                .name = "vp27smpx",

        },

        .id             = I2C_DRIVERID_VP27SMPX,

        .attach_adapter = vp27smpx_probe,

        .detach_client  = vp27smpx_detach,

        .command        = vp27smpx_command,

};

static int __init vp27smpx_init_module(void)

{

        return i2c_add_driver(&i2c_driver);

}

static void __exit vp27smpx_cleanup_module(void)

{

        i2c_del_driver(&i2c_driver);

}

module_init(vp27smpx_init_module);

module_exit(vp27smpx_cleanup_module);