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Commit 75d88079 authored by Andres Salomon's avatar Andres Salomon Committed by Anton Vorontsov
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power_supply: fix up CHARGE_COUNTER output to be more precise 



As Richard Smith pointed out, ACR * 6250 / 15 provides for less
precision loss than ACR * 4167 / 10, _and_ it doesn't overflow.  Switch
to using that equation for CHARGE_COUNTER.

Signed-off-by: default avatarAndres Salomon <dilinger@debian.org>
Cc: "Richard A. Smith" <richard@laptop.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent 8e552c36

drivers/power/olpc_battery.c

+2 −2
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ 


#define EC_BAT_VOLTAGE	0x10	/* uint16_t,	*9.76/32,    mV   */

#define EC_BAT_CURRENT	0x11	/* int16_t,	*15.625/120, mA   */

#define EC_BAT_ACR	0x12	/* int16_t,	*416.7,      µAh  */

#define EC_BAT_ACR	0x12	/* int16_t,	*6250/15,    µAh  */

#define EC_BAT_TEMP	0x13	/* uint16_t,	*100/256,   °C  */

#define EC_AMB_TEMP	0x14	/* uint16_t,	*100/256,   °C  */

#define EC_BAT_STATUS	0x15	/* uint8_t,	bitmask */
@@ -295,7 +295,7 @@ static int olpc_bat_get_property(struct power_supply *psy, 
			return ret;



		ec_word = be16_to_cpu(ec_word);

		val->intval = ec_word * 4167 / 10;

		val->intval = ec_word * 6250 / 15;

		break;

	case POWER_SUPPLY_PROP_SERIAL_NUMBER:

		ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);