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battery/max17055: Measure temperature using external thermistor

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By default max17055 measures from internal temperature sensor.

BUG=b:68170538
BRANCH=none
TEST=place a heat source on top of the battery pack and see
temperature rise from 'battery' command

Change-Id: I1c0bb981e366a8a73d2e14e6c1fc92327069e8f1
Signed-off-by: Philip Chen <philipchen@google.com>
Reviewed-on: https://chromium-review.googlesource.com/735080
Commit-Ready: Philip Chen <philipchen@chromium.org>
Tested-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
This commit is contained in:
Philip Chen
2017-10-23 21:24:07 -07:00
committed by chrome-bot
parent 6b516eda69
commit a109ebc3b1
1 changed files with 13 additions and 0 deletions
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13
driver/battery/max17055.c
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@@ -50,6 +50,9 @@
#define STATUS_POR 0x0002
#define STATUS_BST 0x0008
/* Config reg (0x1d) flags */
#define CONF_TSEL 0x8000
/* FStat reg (0x3d) flags */
#define FSTAT_DNR 0x0001
@@ -378,6 +381,16 @@ static void max17055_init(void)
return;
}
/* Set CONFIG.TSEL to measure temperature using external thermistor */
if (max17055_read(REG_CONFIG, &reg)) {
CPRINTS("%s: failed to read reg %02x", __func__, REG_CONFIG);
return;
}
if (max17055_write(REG_CONFIG, (reg | CONF_TSEL))) {
CPRINTS("%s: failed to write reg %02x", __func__, REG_CONFIG);
return;
}
CPRINTS("max17055 configuration succeeded!");
}
DECLARE_HOOK(HOOK_INIT, max17055_init, HOOK_PRIO_DEFAULT);