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pi3usb9281: Add function for translating registers to current limit

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Decode Pericom registers to current limits.

BUG=chrome-os-partner:32003
TEST=Manual on samus_pd. Insert 1A Apple charger, verify current limit
is correctly detected as 1A.
BRANCH=samus

Change-Id: I310d9f22cef80e97c1734e6a56f0034ebe01df31
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/222638
Reviewed-by: Alec Berg <alecaberg@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2014-10-09 15:18:45 -07:00
committed by chrome-internal-fetch
parent 358aeb2877
commit ac2b30d1e7
2 changed files with 25 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
driver/pi3usb9281.h
View File

@@ -74,6 +74,9 @@ int pi3usb9281_get_device_type(uint8_t chip_idx);
/* Get attached charger status. */
int pi3usb9281_get_charger_status(uint8_t chip_idx);
/* Get charger current limit based on device type and charger status. */
int pi3usb9281_get_ilim(int device_type, int charger_status);
/* Set switch configuration to manual. */
int pi3usb9281_set_switch_manual(uint8_t chip_idx, int val);

22
driver/usb_switch_pi3usb9281.c
View File

@@ -119,6 +119,28 @@ int pi3usb9281_get_charger_status(uint8_t chip_idx)
return pi3usb9281_read(chip_idx, PI3USB9281_REG_CHG_STATUS) & 0x1f;
}
int pi3usb9281_get_ilim(int device_type, int charger_status)
{
/* Limit USB port current. 500mA for not listed types. */
int current_limit_ma = 500;
if (charger_status & PI3USB9281_CHG_CAR_TYPE1 ||
charger_status & PI3USB9281_CHG_CAR_TYPE2)
current_limit_ma = 3000;
else if (charger_status & PI3USB9281_CHG_APPLE_1A)
current_limit_ma = 1000;
else if (charger_status & PI3USB9281_CHG_APPLE_2A)
current_limit_ma = 2000;
else if (charger_status & PI3USB9281_CHG_APPLE_2_4A)
current_limit_ma = 2400;
else if (device_type & PI3USB9281_TYPE_CDP)
current_limit_ma = 1500;
else if (device_type & PI3USB9281_TYPE_DCP)
current_limit_ma = 1500;
return current_limit_ma;
}
int pi3usb9281_get_vbus(uint8_t chip_idx)
{
int vbus = pi3usb9281_read(chip_idx, PI3USB9281_REG_VBUS);