power: supply: cpcap-battery: Fix coulomb counter calibration register use
The coulomb counter calibration is not CCO, it's CCM. And the CCM is
nine bits wide signed register, so let's use sign_extend32() for it.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index a9e4952..c8c893d 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -84,7 +84,7 @@
struct cpcap_coulomb_counter_data {
s32 sample; /* 24 or 32 bits */
s32 accumulator;
- s16 offset; /* 10-bits */
+ s16 offset; /* 9 bits */
};
enum cpcap_battery_state {
@@ -224,8 +224,6 @@
if (!divider)
return 0;
- offset &= 0x7ff; /* 10-bits, signed */
-
switch (ddata->vendor) {
case CPCAP_VENDOR_ST:
cc_lsb = 95374; /* μAms per LSB */
@@ -318,12 +316,12 @@
ccd->accumulator = ((s16)buf[3]) << 16;
ccd->accumulator |= buf[2];
- /* Offset value CPCAP_REG_CCO */
- ccd->offset = buf[5];
-
- /* Adjust offset based on mode value CPCAP_REG_CCM? */
- if (buf[4] >= 0x200)
- ccd->offset |= 0xfc00;
+ /*
+ * Coulomb counter calibration offset is CPCAP_REG_CCM,
+ * REG_CCO seems unused
+ */
+ ccd->offset = buf[4];
+ ccd->offset = sign_extend32(ccd->offset, 9);
return cpcap_battery_cc_to_uah(ddata,
ccd->sample,
