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Commit b36dba2a authored by Manu Gautam's avatar Manu Gautam Committed by Gerrit - the friendly Code Review server
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USB: gadget: qti: Add sysfs node to unbind/bind gadget 



In order to allow userspace change USB composition add
a sysfs node. It can be used by userspace to unbind
qti_usb gadget and enable new composition using configfs
if required.

Change-Id: I51b76fe935eabcbb132b77e447abb2c36f83ad83
Signed-off-by: default avatarManu Gautam <mgautam@codeaurora.org>
parent 497e1f66

drivers/usb/gadget/legacy/qti_gadget.c

+43 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ struct qti_usb_gadget { 
	struct usb_composite_driver composite;



	const char *composition_funcs;

	bool enabled;

	struct device *dev;

};
@@ -413,6 +414,9 @@ static int qti_gadget_register(struct qti_usb_gadget *qg) 
{

	int ret;



	if (qg->enabled)

		return -EINVAL;



	ret = qti_usb_configs_make(qg, qg->composition_funcs);

	if (ret)

		return ret;
@@ -437,6 +441,8 @@ static int qti_gadget_register(struct qti_usb_gadget *qg) 
	if (ret)

		goto free_name;



	qg->enabled = true;



	return 0;



free_name:
@@ -449,9 +455,14 @@ static int qti_gadget_register(struct qti_usb_gadget *qg) 


static void qti_gadget_unregister(struct qti_usb_gadget *qg)

{

	if (!qg->enabled)

		return;



	usb_gadget_unregister_driver(&qg->composite.gadget_driver);

	kfree(qg->composite.gadget_driver.function);

	qti_cleanup_configs_funcs(qg);



	qg->enabled = false;

}



static int qti_gadget_get_properties(struct qti_usb_gadget *gadget)
@@ -501,6 +512,35 @@ static int qti_gadget_get_properties(struct qti_usb_gadget *gadget) 
	return 0;

}



static ssize_t enabled_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct qti_usb_gadget *qg = dev_get_drvdata(dev);



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

			qg->enabled ? 'Y' : 'N');

}



static ssize_t enabled_store(struct device *dev,

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

{

	struct qti_usb_gadget *qg = dev_get_drvdata(dev);

	bool enable;

	int ret;



	ret = strtobool(buf, &enable);

	if (ret)

		return ret;



	if (enable)

		qti_gadget_register(qg);

	else

		qti_gadget_unregister(qg);



	return count;

}

static DEVICE_ATTR_RW(enabled);



static int qti_gadget_probe(struct platform_device *pdev)

{

	int ret;
@@ -524,6 +564,8 @@ static int qti_gadget_probe(struct platform_device *pdev) 
	if (ret)

		return ret;



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



	return 0;

}
@@ -531,6 +573,7 @@ static int qti_gadget_remove(struct platform_device *pdev) 
{

	struct qti_usb_gadget *qg = platform_get_drvdata(pdev);



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

	qti_gadget_unregister(qg);



	return 0;