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max8925_power: Do not read random data from chip registers

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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>
This commit is contained in:
Philip Rakity 2011-09-02 04:20:01 +02:00 committed by Anton Vorontsov
parent 60a1f6e446
commit b57f2f6108
1 changed files with 6 additions and 0 deletions
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6
drivers/power/max8925_power.c
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@ -160,25 +160,31 @@ static irqreturn_t max8925_charger_handler(int irq, void *data)
static int start_measure(struct max8925_power_info *info, int type) static int start_measure(struct max8925_power_info *info, int type)
{ {
unsigned char buf[2] = {0, 0}; unsigned char buf[2] = {0, 0};
int meas_cmd;
int meas_reg = 0, ret; int meas_reg = 0, ret;
switch (type) { switch (type) {
case MEASURE_VCHG: case MEASURE_VCHG:
meas_cmd = MAX8925_CMD_VCHG;
meas_reg = MAX8925_ADC_VCHG; meas_reg = MAX8925_ADC_VCHG;
break; break;
case MEASURE_VBBATT: case MEASURE_VBBATT:
meas_cmd = MAX8925_CMD_VBBATT;
meas_reg = MAX8925_ADC_VBBATT; meas_reg = MAX8925_ADC_VBBATT;
break; break;
case MEASURE_VMBATT: case MEASURE_VMBATT:
meas_cmd = MAX8925_CMD_VMBATT;
meas_reg = MAX8925_ADC_VMBATT; meas_reg = MAX8925_ADC_VMBATT;
break; break;
case MEASURE_ISNS: case MEASURE_ISNS:
meas_cmd = MAX8925_CMD_ISNS;
meas_reg = MAX8925_ADC_ISNS; meas_reg = MAX8925_ADC_ISNS;
break; break;
default: default:
return -EINVAL; return -EINVAL;
} }
max8925_reg_write(info->adc, meas_cmd, 0);
max8925_bulk_read(info->adc, meas_reg, 2, buf); max8925_bulk_read(info->adc, meas_reg, 2, buf);
ret = ((buf[0]<<8) | buf[1]) >> 4; ret = ((buf[0]<<8) | buf[1]) >> 4;