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Unverified Commit 082f70a8 authored by Albert Wang's avatar Albert Wang Committed by Michael Bestas
Browse files

usb: new attributes implementation to enable/disable usb data 



Bug: 188760285
Test: driver probe and attributes access normally
Signed-off-by: default avatarAlbert Wang <albertccwang@google.com>
Change-Id: I0aec98eebff9454cdec065bb09825f6442ac013b
parent 89f6b418

Documentation/ABI/testing/sysfs-class-udc

0 → 100644
+16 −0
Original line number Diff line number Diff line 
What:		/sys/class/udc/<udc name>/device/usb_data_enabled

Date:		December 2020

Contact:	"Ray Chi" <raychi@google.com>

Description:

		The attribute can allow user space can check and modify

		the value to enable or disable usb functionality. Therefore,

		if the attritube is set to 0, USB host and USB peripheral

		modes wouldn't be working.



		Example:

		Enable USB data functionality

		# echo 1 > /sys/class/udc/.../device/usb_data_enabled



		Disable USB data functionality

		# echo 0 > /sys/class/udc/.../device/usb_data_enabled

drivers/usb/dwc3/dwc3-msm.c

+39 −0
Original line number Diff line number Diff line
@@ -533,6 +533,7 @@ struct dwc3_msm { 
	bool			dual_port;



	bool			perf_mode;

	bool			usb_data_enabled;

};



#define USB_HSPHY_3P3_VOL_MIN		3050000 /* uV */
@@ -4023,6 +4024,9 @@ static int dwc3_msm_id_notifier(struct notifier_block *nb, 
	if (!edev || !mdwc)

		return NOTIFY_DONE;



	if (!mdwc->usb_data_enabled)

		return NOTIFY_DONE;



	dwc = platform_get_drvdata(mdwc->dwc3);



	dbg_event(0xFF, "extcon idx", enb->idx);
@@ -4077,6 +4081,9 @@ static int dwc3_msm_vbus_notifier(struct notifier_block *nb, 
	if (!edev || !mdwc)

		return NOTIFY_DONE;



	if (!mdwc->usb_data_enabled)

		return NOTIFY_DONE;



	dwc = platform_get_drvdata(mdwc->dwc3);



	dbg_event(0xFF, "extcon idx", enb->idx);
@@ -4660,6 +4667,34 @@ int dwc3_msm_release_ss_lane(struct device *dev, bool usb_dp_concurrent_mode) 
}

EXPORT_SYMBOL(dwc3_msm_release_ss_lane);



static ssize_t usb_data_enabled_show(struct device *dev,

				     struct device_attribute *attr, char *buf)

{

	struct dwc3_msm *mdwc = dev_get_drvdata(dev);



	return sysfs_emit(buf, "%s\n",

			  mdwc->usb_data_enabled ? "enabled" : "disabled");

}



static ssize_t usb_data_enabled_store(struct device *dev,

				      struct device_attribute *attr,

				      const char *buf, size_t count)

{

	struct dwc3_msm *mdwc = dev_get_drvdata(dev);



	if (kstrtobool(buf, &mdwc->usb_data_enabled))

		return -EINVAL;



	if (!mdwc->usb_data_enabled) {

		mdwc->vbus_active = false;

		mdwc->id_state = DWC3_ID_FLOAT;

		dwc3_ext_event_notify(mdwc);

	}



	return count;

}

static DEVICE_ATTR_RW(usb_data_enabled);



static int dwc3_msm_probe(struct platform_device *pdev)

{

	struct device_node *node = pdev->dev.of_node, *dwc3_node;
@@ -5077,10 +5112,13 @@ static int dwc3_msm_probe(struct platform_device *pdev) 
		dwc3_ext_event_notify(mdwc);

	}



	/* set the initial value */

	mdwc->usb_data_enabled = true;

	device_create_file(&pdev->dev, &dev_attr_orientation);

	device_create_file(&pdev->dev, &dev_attr_mode);

	device_create_file(&pdev->dev, &dev_attr_speed);

	device_create_file(&pdev->dev, &dev_attr_bus_vote);

	device_create_file(&pdev->dev, &dev_attr_usb_data_enabled);



	return 0;
@@ -5109,6 +5147,7 @@ static int dwc3_msm_remove(struct platform_device *pdev) 
	device_remove_file(&pdev->dev, &dev_attr_mode);

	device_remove_file(&pdev->dev, &dev_attr_speed);

	device_remove_file(&pdev->dev, &dev_attr_bus_vote);

	device_remove_file(&pdev->dev, &dev_attr_usb_data_enabled);



	if (mdwc->dpdm_nb.notifier_call) {

		regulator_unregister_notifier(mdwc->dpdm_reg, &mdwc->dpdm_nb);