max8925_power: Do not read random data from chip registers
Reading the voltage, charge etc requires that we tell the chip
what property we want to read before reading it according to
maxim.
Signed-off-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Thomas Liu <Thomas.Liu@maxim-ic.com>
Tested-by: Ted Bennett <tbennett@marvell.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c
index 377d1e6..d87032a 100644
--- a/drivers/power/max8925_power.c
+++ b/drivers/power/max8925_power.c
@@ -160,25 +160,31 @@
static int start_measure(struct max8925_power_info *info, int type)
{
unsigned char buf[2] = {0, 0};
+ int meas_cmd;
int meas_reg = 0, ret;
switch (type) {
case MEASURE_VCHG:
+ meas_cmd = MAX8925_CMD_VCHG;
meas_reg = MAX8925_ADC_VCHG;
break;
case MEASURE_VBBATT:
+ meas_cmd = MAX8925_CMD_VBBATT;
meas_reg = MAX8925_ADC_VBBATT;
break;
case MEASURE_VMBATT:
+ meas_cmd = MAX8925_CMD_VMBATT;
meas_reg = MAX8925_ADC_VMBATT;
break;
case MEASURE_ISNS:
+ meas_cmd = MAX8925_CMD_ISNS;
meas_reg = MAX8925_ADC_ISNS;
break;
default:
return -EINVAL;
}
+ max8925_reg_write(info->adc, meas_cmd, 0);
max8925_bulk_read(info->adc, meas_reg, 2, buf);
ret = ((buf[0]<<8) | buf[1]) >> 4;