diff options
| author | Bryan O'Donoghue <bryan.odonoghue@linaro.org> | 2020-05-08 19:29:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-13 15:20:49 +0300 |
| commit | 3e63cff384e625f09758ce8f4d01ae3033402b63 (patch) | |
| tree | ca967d40ccbba05dda14d1bd1b9eb480e20434ef /drivers/usb/roles/class.c | |
| parent | b919e077cccfbb77beb98809568b2fb0b4d113ec (diff) | |
| download | linux-3e63cff384e625f09758ce8f4d01ae3033402b63.tar.xz | |
usb: roles: Switch on role-switch uevent reporting
Right now we don't report to user-space a role switch when doing a
usb_role_switch_set_role() despite having registered the uevent callbacks.
This patch switches on the notifications allowing user-space to see
role-switch change notifications and subsequently determine the current
controller data-role.
example:
PFX=/devices/platform/soc/78d9000.usb/ci_hdrc.0
root@somebox# udevadm monitor -p
KERNEL[49.894994] change $PFX/usb_role/ci_hdrc.0-role-switch (usb_role)
ACTION=change
DEVPATH=$PFX/usb_role/ci_hdrc.0-role-switch
SUBSYSTEM=usb_role
DEVTYPE=usb_role_switch
USB_ROLE_SWITCH=ci_hdrc.0-role-switch
SEQNUM=2432
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Wen Yang <wenyang@linux.alibaba.com>
Cc: chenqiwu <chenqiwu@xiaomi.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20200508162937.2566818-1-bryan.odonoghue@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/roles/class.c')
| -rw-r--r-- | drivers/usb/roles/class.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index 5b17709821df..27d92af29635 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -49,8 +49,10 @@ int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role) mutex_lock(&sw->lock); ret = sw->set(sw, role); - if (!ret) + if (!ret) { sw->role = role; + kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE); + } mutex_unlock(&sw->lock); |