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usb: mtu3: add a vbus debugfs interface

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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: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2017-08-04 10:32:46 +08:00 committed by Greg Kroah-Hartman
parent 46edf52d08
commit e97d2a3968
1 changed files with 50 additions and 8 deletions
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58
drivers/usb/mtu3/mtu3_dr.c
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@ -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)
dev_err(ssusb->dev, "create debugfs root failed\n");
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)