From: Richard Leitner <richard.leit...@skidata.com>
For some userspace applications information on the number of
over-current conditions at specific USB hub ports is relevant. Therefore
introduce a oc_counter in the usb port struct which is exported via
sysfs.
Signed-off-by: Richard Leitner <richard.leit...@skidata.com>
---
Tested on an i.MX6DL based board.
---
drivers/usb/core/hub.c | 4 +++-
drivers/usb/core/hub.h | 1 +
drivers/usb/core/port.c | 10 ++++++++++
3 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c5c1f6cf3228..448fba1e1827 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->oc_count++;
- dev_dbg(&port_dev->dev, "over-current change\n");
+ dev_dbg(&port_dev->dev, "over-current change #%u\n",
+ port_dev->oc_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..b5cf567bf9e2 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -100,6 +100,7 @@ struct usb_port {
unsigned int is_superspeed:1;
unsigned int usb3_lpm_u1_permit:1;
unsigned int usb3_lpm_u2_permit:1;
+ unsigned int oc_count;
};
#define to_usb_port(_dev) \
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 1a01e9ad3804..0bfe410eb8a7 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 oc_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->oc_count);
+}
+static DEVICE_ATTR_RO(oc_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_oc_count.attr,
NULL,
};
--
2.11.0
--
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