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authorChunfeng Yun <chunfeng.yun@mediatek.com>2017-08-04 10:32:46 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-08-10 11:36:50 -0700
commite97d2a396860de5036b070bcf69990153ac16d03 (patch)
treec80fb51ce69d2e96e30d9222c7714bd76ec83516 /drivers/usb/mtu3
parent46edf52d08342b3dc1f9a61c5200ab8b1c0f5a37 (diff)
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: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/mtu3')
-rw-r--r--drivers/usb/mtu3/mtu3_dr.c58
1 files changed, 50 insertions, 8 deletions
diff --git a/drivers/usb/mtu3/mtu3_dr.c b/drivers/usb/mtu3/mtu3_dr.c
index 11a0d3b84c5e..560256115b23 100644
--- a/drivers/usb/mtu3/mtu3_dr.c
+++ b/drivers/usb/mtu3/mtu3_dr.c
@@ -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)