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Driver: BD99955: Set minimum charge current & charge voltage values

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If the charge current or charge voltage registers are set to zero then the
charger cuts the power to board. BD99955 does not support 0mA charge current
& 0mV charge voltage values hence set the charge current & charge voltage
to charger's minimum values.

BUG=chrome-os-partner:52050
BRANCH=none
TEST=Manually tested on Amenia. Board can boot without the battery.
     Battery does not discharge when the charger current or charger
     voltage is sent to 0 from the charger manager.

Change-Id: I8049525594d107d7ad1ff2f17e8df757ee86458c
Signed-off-by: Vijay Hiremath <vijay.p.hiremath@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/337404
Commit-Ready: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Tested-by: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Reviewed-by: Shawn N <shawnn@chromium.org>
This commit is contained in:
Vijay Hiremath
2016-04-04 16:21:18 -07:00
committed by chrome-bot
parent 1a5fd44c31
commit 55032aa123
2 changed files with 8 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
driver/charger/bd99955.c
View File

@@ -322,6 +322,9 @@ int charger_set_current(int current)
/* Charge current step 64 mA */
current &= ~0x3F;
if (current < bd99955_charger_info.current_min)
current = bd99955_charger_info.current_min;
return ch_raw_write16(BD99955_CMD_CHG_CURRENT, current,
BD99955_BAT_CHG_COMMAND);
}
@@ -334,21 +337,12 @@ int charger_get_voltage(int *voltage)
int charger_set_voltage(int voltage)
{
/*
* The BD99955 will drop voltage to as low as requested. As the
* charger state machine will pass in 0 voltage, protect the system
* voltage by capping to the minimum. The reason is that the BD99955
* only can regulate the system voltage which will kill the board's
* power if below 0.
*/
if (voltage == 0) {
const struct battery_info *bi = battery_get_info();
voltage = bi->voltage_min;
}
/* Charge voltage step 16 mV */
voltage &= ~0x0F;
if (voltage < bd99955_charger_info.voltage_min)
voltage = bd99955_charger_info.voltage_min;
return ch_raw_write16(BD99955_CMD_CHG_VOLTAGE, voltage,
BD99955_BAT_CHG_COMMAND);
}

2
driver/charger/bd99955.h
View File

@@ -31,7 +31,7 @@ enum bd99955_charge_port {
#define CHARGE_V_MIN 3072
#define CHARGE_V_STEP 16
#define CHARGE_I_MAX 16320
#define CHARGE_I_MIN 0
#define CHARGE_I_MIN 64
#define CHARGE_I_OFF 0
#define CHARGE_I_STEP 64
#define INPUT_I_MAX 16352