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cleanup: Comments in extpower_falco.c

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Note that adapter current limits are specific to the given battery
charger chip used in falco.  Since the file is named extpower_falco.c,
no additional fixing needed.

Comment change only; code is the same.

BUG=none
BRANCH=none
TEST=compile falco

Change-Id: I28d8b6c9335ec188c30f7c47fb2f8ecdda276bae
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/173914
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
This commit is contained in:
Randall Spangler
2013-10-21 12:49:19 -07:00
committed by chrome-internal-fetch
parent 10bd1db6d7
commit 8e13fec4b8
1 changed files with 13 additions and 7 deletions
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20
common/extpower_falco.c
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@@ -54,13 +54,19 @@ BUILD_ASSERT(ARRAY_SIZE(ad_id_vals) == NUM_ADAPTER_TYPES);
test_export_static
int ad_input_current[][NUM_AC_TURBO_STATES] = {
/* Current limits in mA, for turbo off and turbo on. In hex,
* because the BQ24738 Input Current Register masks off bits 6-0.
* FIXME: That constraint may vary with other chargers. */
{0x0a00, 0x0a00}, /* ADAPTER_UNKNOWN */
{0x0600, 0x0800}, /* ADAPTER_45W */
{0x0a00, 0x0c00}, /* ADAPTER_65W */
{0x0f00, 0x1100} /* ADAPTER_90W */
/*
* Current limits in mA for each adapter, for turbo off and turbo on.
* Values are in hex to avoid roundoff, because the BQ24738 Input
* Current Register masks off bits 6-0.
*
* Note that this is very specific to the combinations of adapters and
* BQ24738 charger chip on Falco.
*/
{0x0a00, 0x0a00}, /* ADAPTER_UNKNOWN ~ 2.5 A */
{0x0600, 0x0800}, /* ADAPTER_45W ~ 1.5-2.0 A */
{0x0a00, 0x0c00}, /* ADAPTER_65W ~ 2.5-3.0 A */
{0x0f00, 0x1100} /* ADAPTER_90W ~ 3.8-4.3 A */
};
BUILD_ASSERT(ARRAY_SIZE(ad_input_current) == NUM_ADAPTER_TYPES);