linux-imx

/*

 * wm8775 - driver version 0.0.1

 *

 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>

 *

 * Based on saa7115 driver

 *

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

 * - Cleanup

 * - V4L2 API update

 * - sound fixes

 *

 * 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.

 */

​

#include <linux/module.h>

#include <linux/types.h>

#include <linux/slab.h>

#include <linux/ioctl.h>

#include <linux/uaccess.h>

#include <linux/i2c.h>

#include <linux/videodev2.h>

#include <media/v4l2-device.h>

#include <media/v4l2-ctrls.h>

#include <media/i2c/wm8775.h>

​

MODULE_DESCRIPTION("wm8775 driver");

MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");

MODULE_LICENSE("GPL");

​

​

​

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

​

enum {

    R7 = 7, R11 = 11,

    R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,

    TOT_REGS

};

​

#define ALC_HOLD 0x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */

#define ALC_EN 0x100  /* R17: ALC enable */

​

struct wm8775_state {

    struct v4l2_subdev sd;

    struct v4l2_ctrl_handler hdl;

    struct v4l2_ctrl *mute;

    struct v4l2_ctrl *vol;

    struct v4l2_ctrl *bal;

    struct v4l2_ctrl *loud;

    u8 input;       /* Last selected input (0-0xf) */

};

​

static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)

{

    return container_of(sd, struct wm8775_state, sd);

}

​

static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)

{

    return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd;

}

​

static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)

{

    struct i2c_client *client = v4l2_get_subdevdata(sd);

    int i;

​

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

        v4l2_err(sd, "Invalid register R%d\n", reg);

        return -1;

    }

​

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

        if (i2c_smbus_write_byte_data(client,

                (reg << 1) | (val >> 8), val & 0xff) == 0)

            return 0;

    v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);

    return -1;

}

​

static void wm8775_set_audio(struct v4l2_subdev *sd, int quietly)

{

    struct wm8775_state *state = to_state(sd);