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extcon: max77843: Add OTG power control to the MUIC driver

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Enabling power on VBUS micro-usb pin is required only when passive OTG
cable is connected. Initially OTG VBUS power control was planned to be
done in charger driver. However such information is not really available
from the extcon notifications, so VBUS power control has to be done
directly in MUIC driver, which has all information about the attached
accessory.

For example SmartDock is externally powered accessory, provides OTG
(USB HOST) functionality and use VBUS pin for charging a device battery,
so the VBUS charging pump should be disabled in such case.

Signed-off-by: Marek Szyprowski <[email protected]>
Acked-by: Chanwoo Choi <[email protected]>
Acked-by: Lee Jones <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
This commit is contained in:
Marek Szyprowski 2017-10-18 11:56:21 +02:00 • committed by Chanwoo Choi
commit 7b9651103b
2 changed files with 19 additions and 0 deletions
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16
drivers/extcon/extcon-max77843.c
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@ -240,6 +240,21 @@ static int max77843_muic_set_path(struct max77843_muic_info *info,
return 0;
}
static void max77843_charger_set_otg_vbus(struct max77843_muic_info *info,
bool on)
{
struct max77693_dev *max77843 = info->max77843;
unsigned int cnfg00;
if (on)
cnfg00 = MAX77843_CHG_OTG_MASK | MAX77843_CHG_BOOST_MASK;
else
cnfg00 = MAX77843_CHG_ENABLE | MAX77843_CHG_BUCK_MASK;
regmap_update_bits(max77843->regmap_chg, MAX77843_CHG_REG_CHG_CNFG_00,
MAX77843_CHG_MODE_MASK, cnfg00);
}
static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
enum max77843_muic_cable_group group, bool *attached)
{
@ -355,6 +370,7 @@ static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
return ret;
extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
max77843_charger_set_otg_vbus(info, attached);
break;
case MAX77843_MUIC_GND_MHL_VB:
case MAX77843_MUIC_GND_MHL: