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Commit e97d2a39 authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
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usb: mtu3: add a vbus debugfs interface 



Provides a new vbus debugfs interface used to turn on/off vbus
regulator, it also can be used to get/put reference count of
vbus, due to sometimes we need keep it alive when manually switch
mtu3 to device mode.

Signed-off-by: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 46edf52d

drivers/usb/mtu3/mtu3_dr.c

+50 −8
Original line number Diff line number Diff line
@@ -322,23 +322,65 @@ static const struct file_operations ssusb_mode_fops = { 
	.release = single_release,

};



static int ssusb_vbus_show(struct seq_file *sf, void *unused)

{

	struct ssusb_mtk *ssusb = sf->private;

	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;



	seq_printf(sf, "vbus state: %s\n(echo on/off)\n",

		regulator_is_enabled(otg_sx->vbus) ? "on" : "off");



	return 0;

}



static int ssusb_vbus_open(struct inode *inode, struct file *file)

{

	return single_open(file, ssusb_vbus_show, inode->i_private);

}



static ssize_t ssusb_vbus_write(struct file *file,

	const char __user *ubuf, size_t count, loff_t *ppos)

{

	struct seq_file *sf = file->private_data;

	struct ssusb_mtk *ssusb = sf->private;

	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;

	char buf[16];

	bool enable;



	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))

		return -EFAULT;



	if (kstrtobool(buf, &enable)) {

		dev_err(ssusb->dev, "wrong setting\n");

		return -EINVAL;

	}



	ssusb_set_vbus(otg_sx, enable);



	return count;

}



static const struct file_operations ssusb_vbus_fops = {

	.open = ssusb_vbus_open,

	.write = ssusb_vbus_write,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



static void ssusb_debugfs_init(struct ssusb_mtk *ssusb)

{

	struct dentry *root;

	struct dentry *file;



	root = debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);

	if (IS_ERR_OR_NULL(root)) {

		if (!root)

	if (!root) {

		dev_err(ssusb->dev, "create debugfs root failed\n");

		return;

	}

	ssusb->dbgfs_root = root;



	file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,

			ssusb, &ssusb_mode_fops);

	if (!file)

		dev_dbg(ssusb->dev, "create debugfs mode failed\n");

	debugfs_create_file("mode", 0644, root, ssusb, &ssusb_mode_fops);

	debugfs_create_file("vbus", 0644, root, ssusb, &ssusb_vbus_fops);

}



static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb)