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authorRichard Leitner <richard.leitner@skidata.com>2018-03-20 11:17:13 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-22 13:07:05 +0100
commit1cbd53c8cd85a63383a075347abee8f6e3f14fbe (patch)
treef80b57ca914df69f6d4cfecb0515bfbb5a40c5e3 /drivers/usb
parente3cb7bde9a6a8bfdee5917facf00afb98fee1821 (diff)
downloadlinux-1cbd53c8cd85a63383a075347abee8f6e3f14fbe.tar.bz2
usb: core: introduce per-port over-current counters
For some userspace applications information on the number of over-current conditions at specific USB hub ports is relevant. In our case we have a series of USB hardware (using the cp210x driver) which communicates using a proprietary protocol. These devices sometimes trigger an over-current situation on some hubs. In case of such an over-current situation the USB devices offer an interface for reducing the max used power. As these conditions are quite rare and imply performance reductions of the device we don't want to reduce the max power always. Therefore give user-space applications the possibility to react adequately by introducing an over_current_counter in the usb port struct which is exported via sysfs. Signed-off-by: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/hub.c4
-rw-r--r--drivers/usb/core/hub.h1
-rw-r--r--drivers/usb/core/port.c10
3 files changed, 14 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index ac7bab772a3a..aaeef03c0d83 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5104,8 +5104,10 @@ static void port_event(struct usb_hub *hub, int port1)
if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
u16 status = 0, unused;
+ port_dev->over_current_count++;
- dev_dbg(&port_dev->dev, "over-current change\n");
+ dev_dbg(&port_dev->dev, "over-current change #%u\n",
+ port_dev->over_current_count);
usb_clear_port_feature(hdev, port1,
USB_PORT_FEAT_C_OVER_CURRENT);
msleep(100); /* Cool down */
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 2a700ccc868c..4dc769ee9c74 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -96,6 +96,7 @@ struct usb_port {
enum usb_port_connect_type connect_type;
usb_port_location_t location;
struct mutex status_lock;
+ u32 over_current_count;
u8 portnum;
unsigned int is_superspeed:1;
unsigned int usb3_lpm_u1_permit:1;
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 1a01e9ad3804..6979bde87d31 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -41,6 +41,15 @@ static ssize_t connect_type_show(struct device *dev,
}
static DEVICE_ATTR_RO(connect_type);
+static ssize_t over_current_count_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+
+ return sprintf(buf, "%u\n", port_dev->over_current_count);
+}
+static DEVICE_ATTR_RO(over_current_count);
+
static ssize_t usb3_lpm_permit_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -109,6 +118,7 @@ static DEVICE_ATTR_RW(usb3_lpm_permit);
static struct attribute *port_dev_attrs[] = {
&dev_attr_connect_type.attr,
+ &dev_attr_over_current_count.attr,
NULL,
};