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/*

 * wm8739

 *

 * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>

 *

 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>

 * - Cleanup

 *

 * 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("wm8739 driver");

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

MODULE_LICENSE("GPL");

static int debug = 0;

static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };

module_param(debug, int, 0644);

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

I2C_CLIENT_INSMOD;

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

enum {

        R0 = 0, R1,

        R5 = 5, R6, R7, R8, R9, R15 = 15,

        TOT_REGS

};

struct wm8739_state {

        u32 clock_freq;

        u8 muted;

        u16 volume;

        u16 balance;

        u8 vol_l;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */

        u8 vol_r;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */

};

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

static int wm8739_write(struct i2c_client *client, int reg, u16 val)

{

        int i;

        if (reg < 0 || reg >= TOT_REGS) {

                v4l_err(client, "Invalid register R%d\n", reg);

                return -1;

        }

        v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);

        for (i = 0; i < 3; i++) {

                if (i2c_smbus_write_byte_data(client, (reg << 1) |

                                        (val >> 8), val & 0xff) == 0) {

                        return 0;

                }

        }

        v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);

        return -1;

}

/* write regs to set audio volume etc */

static void wm8739_set_audio(struct i2c_client *client)

{

        struct wm8739_state *state = i2c_get_clientdata(client);

        u16 mute = state->muted ? 0x80 : 0;

        /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB

         * Default setting: 0x17 = 0 dB

         */

        wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);

        wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);

}

static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)

{

        struct wm8739_state *state = i2c_get_clientdata(client);

        switch (ctrl->id) {

        case V4L2_CID_AUDIO_MUTE:

                ctrl->value = state->muted;

                break;

        case V4L2_CID_AUDIO_VOLUME:

                ctrl->value = state->volume;

                break;

        case V4L2_CID_AUDIO_BALANCE:

                ctrl->value = state->balance;

                break;

        default:

                return -EINVAL;

        }

        return 0;

}

static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)

{

        struct wm8739_state *state = i2c_get_clientdata(client);

        unsigned int work_l, work_r;

        switch (ctrl->id) {

        case V4L2_CID_AUDIO_MUTE:

                state->muted = ctrl->value;

                break;

        case V4L2_CID_AUDIO_VOLUME:

                state->volume = ctrl->value;

                break;

        case V4L2_CID_AUDIO_BALANCE:

                state->balance = ctrl->value;

                break;

        default:

                return -EINVAL;

        }

        /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */

        work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;

        work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;

        state->vol_l = (long)work_l * 31 / 65535;

        state->vol_r = (long)work_r * 31 / 65535;

        /* set audio volume etc. */

        wm8739_set_audio(client);

        return 0;

}

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

static struct v4l2_queryctrl wm8739_qctrl[] = {

        {

                .id            = V4L2_CID_AUDIO_VOLUME,

                .name          = "Volume",

                .minimum       = 0,

                .maximum       = 65535,

                .step          = 65535/100,

                .default_value = 58880,

                .flags         = 0,

                .type          = V4L2_CTRL_TYPE_INTEGER,

        },{

                .id            = V4L2_CID_AUDIO_MUTE,

                .name          = "Mute",

                .minimum       = 0,

                .maximum       = 1,

                .step          = 1,

                .default_value = 1,

                .flags         = 0,

                .type          = V4L2_CTRL_TYPE_BOOLEAN,

        },{

                .id            = V4L2_CID_AUDIO_BALANCE,

                .name          = "Balance",

                .minimum       = 0,

                .maximum       = 65535,

                .step          = 65535/100,

                .default_value = 32768,

                .flags         = 0,

                .type          = V4L2_CTRL_TYPE_INTEGER,

        }

};

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

static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg)

{

        struct wm8739_state *state = i2c_get_clientdata(client);

        switch (cmd) {

        case VIDIOC_INT_AUDIO_CLOCK_FREQ:

        {

                u32 audiofreq = *(u32 *)arg;

                state->clock_freq = audiofreq;

                wm8739_write(client, R9, 0x000);        /* de-activate */

                switch (audiofreq) {

                case 44100:

                        wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k     */

                        break;

                case 48000:

                        wm8739_write(client, R8, 0x000); /* 256fps, fs=48k       */

                        break;

                case 32000:

                        wm8739_write(client, R8, 0x018); /* 256fps, fs=32k       */

                        break;

                default:

                        break;

                }

                wm8739_write(client, R9, 0x001);        /* activate */

                break;

        }

        case VIDIOC_G_CTRL:

                return wm8739_get_ctrl(client, arg);

        case VIDIOC_S_CTRL:

                return wm8739_set_ctrl(client, arg);

        case VIDIOC_QUERYCTRL:

        {

                struct v4l2_queryctrl *qc = arg;

                int i;

                for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)

                        if (qc->id && qc->id == wm8739_qctrl[i].id) {

                                memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));

                                return 0;

                        }

                return -EINVAL;

        }

        case VIDIOC_G_CHIP_IDENT:

                return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_WM8739, 0);

        case VIDIOC_LOG_STATUS:

                v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);

                v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,

                                state->muted ? " (muted)" : "");

                v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,

                                state->muted ? " (muted)" : "");

                break;

        default:

                return -EINVAL;

        }

        return 0;

}

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

/* i2c implementation */

static struct i2c_driver i2c_driver;

static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind)

{

        struct i2c_client *client;

        struct wm8739_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 == NULL)

                return -ENOMEM;

        client->addr = address;

        client->adapter = adapter;

        client->driver = &i2c_driver;

        snprintf(client->name, sizeof(client->name) - 1, "wm8739");

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

        state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);

        if (state == NULL) {

                kfree(client);

                return -ENOMEM;

        }

        state->vol_l = 0x17; /* 0dB */

        state->vol_r = 0x17; /* 0dB */

        state->muted = 0;

        state->balance = 32768;

        /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */

        state->volume = ((long)state->vol_l + 1) * 65535 / 31;

        state->clock_freq = 48000;

        i2c_set_clientdata(client, state);

        /* initialize wm8739 */

        wm8739_write(client, R15, 0x00); /* reset */

        wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */

        wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */

        wm8739_write(client, R7, 0x049); /* Digital Audio interface format */

                                         /* Enable Master mode */

                                         /* 24 bit, MSB first/left justified */

        wm8739_write(client, R8, 0x000); /* sampling control */

                                         /* normal, 256fs, 48KHz sampling rate */

        wm8739_write(client, R9, 0x001); /* activate */

        wm8739_set_audio(client);        /* set volume/mute */

        i2c_attach_client(client);

        return 0;

}

static int wm8739_probe(struct i2c_adapter *adapter)

{

        if (adapter->class & I2C_CLASS_TV_ANALOG)

                return i2c_probe(adapter, &addr_data, wm8739_attach);

        return 0;

}

static int wm8739_detach(struct i2c_client *client)

{

        struct wm8739_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 = "wm8739",

        },

        .id = I2C_DRIVERID_WM8739,

        .attach_adapter = wm8739_probe,

        .detach_client  = wm8739_detach,

        .command = wm8739_command,

};

static int __init wm8739_init_module(void)

{

        return i2c_add_driver(&i2c_driver);

}

static void __exit wm8739_cleanup_module(void)

{

        i2c_del_driver(&i2c_driver);

}

module_init(wm8739_init_module);

module_exit(wm8739_cleanup_module);