From 5c33f8f4c30dcc571675f45a131fce5eba8ee25f Mon Sep 17 00:00:00 2001 From: Chunfeng Yun Date: Fri, 4 Aug 2017 10:32:46 +0800 Subject: [PATCH] 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 Signed-off-by: Felipe Balbi --- drivers/usb/mtu3/mtu3_dr.c | 58 ++++++++++++++++++++++++++++++++------ 1 file 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)