This patchset adds a way for the MSM USB phy to notify a power supply
when the charging state changes. It achieves that using the extcon
subsystem.
The first patch makes sure msm_otg_notify_charger is called after the
charger attributes have been set.
The second one makes sure that function is called when unplugging a
"in-the-wall" charger.
The last one adds EXTCON_CHG_USB_* cables to the phy.
I send this patchset as RFC because it seems a bit peculiar to have
different drivers that generate the EXTCON_USB_* and EXTCON_CHG_USB_*
events, so I want to make sure to get things right.
As far as I can tell, all the drivers in the kernel that have USB
charger events also have the EXTCON_USB one. In this case, this patchset
would make things a bit different for the MSM phy:
+----------+ +--------------+
| gpio | | PMIC |<-+
+----------+ +--------------+ |
| | |
`--------------------+ | EXTCON_CHG_USB_*
| | events
EXTCON_USB | |
events | |
\|/ |
+--------------+ |
| USB PHY |--+
+--------------+
Text version: EXTCON_USB comes from a GPIO or a PMIC, that triggers a
notifier in the USB phy. That notifier will determine the new
EXTCON_CHG_USB_XXX state and the PMIC will be notified about it and
determine how much current it can use to charge a battery.
Please let me know if this is the correct way to go.
Damien Riegel (3):
usb: phy: msm: notify charger after setting charger info
usb: phy: msm: notify charger when power supply is unplugged
usb: phy: msm: use extcon to notify charger
drivers/usb/phy/phy-msm-usb.c | 47 ++++++++++++++++++++++++++++++++++++++++---
1 file changed, 44 insertions(+), 3 deletions(-)
--
2.12.2
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