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Commit 9d384fa0 authored by Ajay Singh Parmar's avatar Ajay Singh Parmar
Browse files

msm: mdss: hdmi: add support for triggering hot plug 



Add sysfs node to trigger cable disconnect/connect hot plug
interrupts. Power off 5v regulator which provides 5v to sink
which in turn pulls hpd line low resulting in disconnect hot
plug interrupt. Similarly, power on 5v regulator to get connect
hot plug interrupt. This is needed to simulate cable connect
and disconnect for some special requirements like resolution
switch from the user applications.

Change-Id: I882358ddb40acf07a5e7be692aac590880e012c2
Signed-off-by: default avatarAjay Singh Parmar <aparmar@codeaurora.org>
parent cbac2b43

drivers/video/msm/mdss/mdss_hdmi_tx.c

+40 −0
Original line number Diff line number Diff line
@@ -1121,6 +1121,44 @@ static ssize_t hdmi_tx_sysfs_rda_s3d_mode(struct device *dev, 
	return ret;

}



static ssize_t hdmi_tx_sysfs_wta_5v(struct device *dev,

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

{

	int read, rc = 0;

	ssize_t ret = strnlen(buf, PAGE_SIZE);

	struct hdmi_tx_ctrl *hdmi_ctrl = NULL;

	struct dss_module_power *pd = NULL;



	hdmi_ctrl = hdmi_tx_get_drvdata_from_sysfs_dev(dev);

	if (!hdmi_ctrl) {

		DEV_ERR("%s: invalid input\n", __func__);

		rc = -EINVAL;

		goto error;

	}



	pd = &hdmi_ctrl->pdata.power_data[HDMI_TX_HPD_PM];

	if (!pd) {

		DEV_ERR("%s: Error: invalid power data\n", __func__);

		rc = -EINVAL;

		goto error;

	}



	rc = kstrtoint(buf, 10, &read);

	if (rc) {

		DEV_ERR("%s: kstrtoint failed. rc=%d\n", __func__, rc);

		goto error;

	}



	read = ~(!!read ^ pd->gpio_config->value) & BIT(0);



	DEV_DBG("%s: writing %d to 5v gpio\n", __func__, read);

	gpio_set_value(pd->gpio_config->gpio, read);



	return ret;

error:

	return rc;

}



static DEVICE_ATTR(connected, S_IRUGO, hdmi_tx_sysfs_rda_connected, NULL);

static DEVICE_ATTR(hdmi_audio_cb, S_IWUSR, NULL, hdmi_tx_sysfs_wta_audio_cb);

static DEVICE_ATTR(video_mode, S_IRUGO, hdmi_tx_sysfs_rda_video_mode, NULL);
@@ -1135,6 +1173,7 @@ static DEVICE_ATTR(avi_itc, S_IWUSR, NULL, hdmi_tx_sysfs_wta_avi_itc); 
static DEVICE_ATTR(avi_cn0_1, S_IWUSR, NULL, hdmi_tx_sysfs_wta_avi_cn_bits);

static DEVICE_ATTR(s3d_mode, S_IRUGO | S_IWUSR, hdmi_tx_sysfs_rda_s3d_mode,

	hdmi_tx_sysfs_wta_s3d_mode);

static DEVICE_ATTR(5v, S_IWUSR, NULL, hdmi_tx_sysfs_wta_5v);



static struct attribute *hdmi_tx_fs_attrs[] = {

	&dev_attr_connected.attr,
@@ -1146,6 +1185,7 @@ static struct attribute *hdmi_tx_fs_attrs[] = { 
	&dev_attr_avi_itc.attr,

	&dev_attr_avi_cn0_1.attr,

	&dev_attr_s3d_mode.attr,

	&dev_attr_5v.attr,

	NULL,

};

static struct attribute_group hdmi_tx_fs_attrs_group = {