ASoC: msm8x16-wcd: Sound control: add mic gain

		headphone_gain_show,

		headphone_gain_store);

static ssize_t mic_gain_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	return snprintf(buf, PAGE_SIZE, "%d\n",

		snd_soc_read(sound_control_codec_ptr, MSM8X16_WCD_A_CDC_TX1_VOL_CTL_GAIN));

}

static ssize_t mic_gain_store(struct kobject *kobj,

		struct kobj_attribute *attr, const char *buf, size_t count)

{

	int input;

	sscanf(buf, "%d", &input);

	if (input < -10 || input > 20)

		input = 0;

	snd_soc_write(sound_control_codec_ptr, MSM8X16_WCD_A_CDC_TX1_VOL_CTL_GAIN, input);

	return count;

}

static struct kobj_attribute mic_gain_attribute =

	__ATTR(mic_gain, 0664,

		mic_gain_show,

		mic_gain_store);

static struct attribute *sound_control_attrs[] = {

		&headphone_gain_attribute.attr,

		&mic_gain_attribute.attr,

		NULL,

};