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power: supply: cpcap-battery: Simplify short term power average calculation 

We can use sign_extend32() here to simplify things. And let's fix the
comment for CCM register, that contains the calibration offset.

Cc: Merlijn Wajer <merlijn@wizzup.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Tony Lindgren 2019-10-09 14:06:19 -07:00 committed by Sebastian Reichel
parent c59b3bad6f
commit ac437c1c84
1 changed files with 10 additions and 13 deletions
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23
drivers/power/supply/cpcap-battery.c
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@ -312,31 +312,28 @@ cpcap_battery_read_accumulated(struct cpcap_battery_ddata *ddata,
static int cpcap_battery_cc_get_avg_current(struct cpcap_battery_ddata *ddata)
{
int value, acc, error;
s32 sample = 1;
s32 sample;
s16 offset;
if (ddata->vendor == CPCAP_VENDOR_ST)
sample = 4;
/* Coulomb counter integrator */
error = regmap_read(ddata->reg, CPCAP_REG_CCI, &value);
if (error)
return error;
if ((ddata->vendor == CPCAP_VENDOR_TI) && (value > 0x2000))
value = value | 0xc000;
if (ddata->vendor == CPCAP_VENDOR_TI) {
acc = sign_extend32(value, 13);
sample = 1;
} else {
acc = (s16)value;
sample = 4;
}
acc = (s16)value;
/* Coulomb counter sample time */
/* Coulomb counter calibration offset */
error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
if (error)
return error;
if (value < 0x200)
offset = value;
else
offset = value | 0xfc00;
offset = sign_extend32(value, 9);
return cpcap_battery_cc_to_ua(ddata, sample, acc, offset);
}