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ACPI / PMIC: xpower: Do pinswitch magic when reading GPADC 

Testing has shown that the TS-pin's bias-current needs to be disabled
when reading the GPIO0 pin in GPADC mode.

It seems that there is only 1 bias current source and to be able to use it
for the GPIO0 pin in GPADC mode it must be temporarily turned off for the
TS pin, but the datasheet does not mention this.

This commit adds the necessary writes to turn the TS pin BIAS current
off before and back on after reading the GPADC. This fixes the GPADC
always returning a reading of 0.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
zero-colors
Hans de Goede 2017-07-08 15:40:08 +02:00 committed by Rafael J. Wysocki
parent 520eccdfe1
commit 58eefe2f3f
1 changed files with 18 additions and 3 deletions
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21
drivers/acpi/pmic/intel_pmic_xpower.c
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@ -27,6 +27,9 @@
#define GPI1_LDO_ON (3 << 0)
#define GPI1_LDO_OFF (4 << 0)
#define AXP288_ADC_TS_PIN_GPADC 0xf2
#define AXP288_ADC_TS_PIN_ON 0xf3
static struct pmic_table power_table[] = {
{
.address = 0x00,
@ -209,11 +212,23 @@ static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
{
u8 buf[2];
int ret;
if (regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 2))
return -EIO;
ret = regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL,
AXP288_ADC_TS_PIN_GPADC);
if (ret)
return ret;
return (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);
/* After switching to the GPADC pin give things some time to settle */
usleep_range(6000, 10000);
ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 2);
if (ret == 0)
ret = (buf[0] << 4) + ((buf[1] >> 4) & 0x0f);
regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON);
return ret;
}
static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {