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bq27x00: Fix CURRENT_NOW property 

According to the bq27000 datasheet the current should be calculated by
the following formula:
    current = AI * 3570 / 20

This patch adjust the drivers code accordingly.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Rodolfo Giometti <giometti@linux.it>
Tested-by: Grazvydas Ignotas <notasas@gmail.com>
This commit is contained in:
Pali Rohár 2010-05-24 20:52:13 +02:00 committed by Lars-Peter Clausen
parent 0e9f30497e
commit a2e5118c37
1 changed files with 5 additions and 2 deletions
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7
drivers/power/bq27x00_battery.c
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@ -44,6 +44,8 @@
#define BQ27500_FLAG_DSC BIT(0)
#define BQ27500_FLAG_FC BIT(9)
#define BQ27000_RS 20 /* Resistor sense */
/* If the system has several batteries we need a different name for each
* of them...
*/
@ -149,7 +151,7 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di)
if (di->chip == BQ27500) {
/* bq27500 returns signed value */
curr = (int)(s16)curr;
curr = (int)((s16)curr) * 1000;
} else {
ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
if (ret < 0) {
@ -160,9 +162,10 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di)
dev_dbg(di->dev, "negative current!\n");
curr = -curr;
}
curr = curr * 3570 / BQ27000_RS;
}
return curr * 1000;
return curr;
}
/*