Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751901AbdHCIho (ORCPT ); Thu, 3 Aug 2017 04:37:44 -0400 Received: from mailgw02.mediatek.com ([218.249.47.111]:54246 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751161AbdHCIhd (ORCPT ); Thu, 3 Aug 2017 04:37:33 -0400 From: Chunfeng Yun To: Greg Kroah-Hartman , Felipe Balbi , Mathias Nyman , Matthias Brugger CC: Chunfeng Yun , , , , Subject: [PATCH 1/2] usb: mtu3: add a vbus debugfs interface Date: Thu, 3 Aug 2017 16:37:18 +0800 Message-ID: <1501749439-8837-1-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3008 Lines: 107 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 --- drivers/usb/mtu3/mtu3_dr.c | 75 +++++++++++++++++++++++++++++++++++++++----- 1 file changed, 67 insertions(+), 8 deletions(-) diff --git a/drivers/usb/mtu3/mtu3_dr.c b/drivers/usb/mtu3/mtu3_dr.c index 11a0d3b..6c75916 100644 --- a/drivers/usb/mtu3/mtu3_dr.c +++ b/drivers/usb/mtu3/mtu3_dr.c @@ -322,23 +322,82 @@ static ssize_t ssusb_mode_write(struct file *file, .release = single_release, }; -static void ssusb_debugfs_init(struct ssusb_mtk *ssusb) +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]; + + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) + return -EFAULT; + + if (!strncmp(buf, "on", 2)) { + ssusb_set_vbus(otg_sx, 1); + } else if (!strncmp(buf, "off", 3)) { + ssusb_set_vbus(otg_sx, 0); + } else { + dev_err(ssusb->dev, "wrong setting\n"); + return -EINVAL; + } + + 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 int 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"); - return; + dev_err(ssusb->dev, "create debugfs root failed\n"); + goto err_dbgfs; } 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"); + file = debugfs_create_file("mode", 0644, root, ssusb, &ssusb_mode_fops); + if (!file) { + dev_err(ssusb->dev, "create debugfs mode failed\n"); + goto err_dbgfs; + } + + file = debugfs_create_file("vbus", 0644, root, ssusb, &ssusb_vbus_fops); + if (!file) { + dev_err(ssusb->dev, "create debugfs vbus failed\n"); + goto err_dbgfs; + } + + return 0; + +err_dbgfs: + debugfs_remove_recursive(ssusb->dbgfs_root); + return -ENOMEM; } static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb) -- 1.7.9.5