diff options
| author | Rajagopala V <rajagopala.v@stericsson.com> | 2011-11-10 17:50:52 +0530 |
|---|---|---|
| committer | Philippe Langlais <philippe.langlais@stericsson.com> | 2012-05-22 11:01:11 +0200 |
| commit | 886b10019c98b81720052babff9080a66caba721 (patch) | |
| tree | 37d28bf09bd837bfb43ee1504946ccf48727b964 | |
| parent | 1fa4ffa3bd74c841979a4f05cf6dd9a64e9769e7 (diff) | |
u5500:gpadc: Fix ab5500 internal temp conversion formula
Fix AB5500 internal die temperature conversion
formula and provide 8bit min/max lavel to auto
trigger.
ST-Ericsson Linux next: NA
ST-Ericsson ID: 372448
ST-Ericsson FOSS-OUT ID: Trivial
Change-Id: I6bb2d0afb657582709f95f1f88466e6c061c1117
Signed-off-by: Rajagopala V <rajagopala.v@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/37296
Reviewed-by: QABUILD
Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
Reviewed-by: Vijaya Kumar K-1 <vijay.kilari@stericsson.com>
Reviewed-by: Arun MURTHY <arun.murthy@stericsson.com>
| -rw-r--r-- | drivers/mfd/ab5500-gpadc.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/mfd/ab5500-gpadc.c b/drivers/mfd/ab5500-gpadc.c index 51d1fa9049a..d099f1b9d73 100644 --- a/drivers/mfd/ab5500-gpadc.c +++ b/drivers/mfd/ab5500-gpadc.c @@ -295,10 +295,10 @@ static int ab5500_gpadc_ad_to_voltage(struct ab5500_gpadc *gpadc, /* * From the AB5500 product specification * T(deg cel) = 27 - ((ADCode - 709)/2.4213) - * 27 + 709/2.4213 - ADCode/2.4123 - * (320 - ADCode)/2.4213 + * 27 + 709/2.4213 - ADCode/2.4213 + * 320 - (ADCode/2.4213) */ - res = 320 - (((unsigned long)ad_val * 1000000) / 242130) / 10; + res = 320 - (((unsigned long)ad_val * 10000) / 24213); break; default: dev_err(gpadc->dev, @@ -747,13 +747,16 @@ int ab5500_gpadc_convert_auto(struct ab5500_gpadc *gpadc, case DIE_TEMP: /* * From the AB5500 product specification - * T(deg_cel) = 27 -(ADCode - 709)/2.4123) - * adc min and max values are based on the above formula. + * T(deg_cel) = 27 - (ADCode - 709)/2.4213) + * ADCode = 709 + (2.4213 * (27 - T)) + * Auto trigger min/max level is of 8bit precision. + * Hence use AB5500_GPADC_MANDATAH_REG value + * obtained by 2 bit right shift of ADCode. */ gpadc->adc_trig[trig].trig_min = - 709 - (22413 * (in->min - 27))/10000; + (709 + ((24213 * (27 - in->min))/10000))>>2; gpadc->adc_trig[trig].trig_max = - 709 - (22413 * (in->max - 27))/10000; + (709 + ((24213 * (27 - in->max))/10000))>>2; gpadc->adc_trig[trig].adout = adc_tab[in->mux].adout; break; |