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iio: adc: rradc: Update die_temp and chg_temp scaling

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The final temperature values for PMI die temperature and
charger temperature are in units of millidegC. Update
the slope factor value to avoid losing resolution
accuracy while values are reported in units of millidegC.

Change-Id: Iec4aa730fa97133af0c0fb9d47557738ef6f45a0
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
This commit is contained in:
Siddartha Mohanadoss 2016-07-26 17:04:56 -07:00 • committed by Nicholas Troast
parent d878d43e16
commit 05da00db9e
1 changed files with 8 additions and 8 deletions
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16
drivers/iio/adc/qcom-rradc.c
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@ -149,12 +149,12 @@
#define FG_ADC_RR_TEMP_FS_VOLTAGE_NUM 5000000
#define FG_ADC_RR_TEMP_FS_VOLTAGE_DEN 3
#define FG_ADC_RR_DIE_TEMP_OFFSET 600000
#define FG_ADC_RR_DIE_TEMP_SLOPE 2000
#define FG_ADC_RR_DIE_TEMP_OFFSET_DEGC 25
#define FG_ADC_RR_DIE_TEMP_SLOPE 2
#define FG_ADC_RR_DIE_TEMP_OFFSET_MILLI_DEGC 25000
#define FG_ADC_RR_CHG_TEMP_OFFSET 1288000
#define FG_ADC_RR_CHG_TEMP_SLOPE 4000
#define FG_ADC_RR_CHG_TEMP_OFFSET_DEGC 27
#define FG_ADC_RR_CHG_TEMP_SLOPE 4
#define FG_ADC_RR_CHG_TEMP_OFFSET_MILLI_DEGC 27000
#define FG_ADC_RR_VOLT_INPUT_FACTOR 8
#define FG_ADC_RR_CURR_INPUT_FACTOR 2
@ -331,8 +331,8 @@ static int rradc_post_process_die_temp(struct rradc_chip *chip,
FG_MAX_ADC_READINGS));
temp -= FG_ADC_RR_DIE_TEMP_OFFSET;
temp = div64_s64(temp, FG_ADC_RR_DIE_TEMP_SLOPE);
temp += FG_ADC_RR_DIE_TEMP_OFFSET_DEGC;
*result_millidegc = (temp * FG_ADC_SCALE_MILLI_FACTOR);
temp += FG_ADC_RR_DIE_TEMP_OFFSET_MILLI_DEGC;
*result_millidegc = temp;
return 0;
}
@ -348,8 +348,8 @@ static int rradc_post_process_chg_temp(struct rradc_chip *chip,
FG_MAX_ADC_READINGS));
temp = FG_ADC_RR_CHG_TEMP_OFFSET - temp;
temp = div64_s64(temp, FG_ADC_RR_CHG_TEMP_SLOPE);
temp = temp + FG_ADC_RR_CHG_TEMP_OFFSET_DEGC;
*result_millidegc = (temp * FG_ADC_SCALE_MILLI_FACTOR);
temp = temp + FG_ADC_RR_CHG_TEMP_OFFSET_MILLI_DEGC;
*result_millidegc = temp;
return 0;
}