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extcon: arizona: Update manual headphone detection calculation 

The higher levels of impedance have a higher minimum value than the
first level. As the same value was used for all levels, higher impedances
were reported with a very low level of accuracy. This patch applies the
approriate lower threshold for each level, whilst we are changing things
add a define for the maximum value at each level to improve readability.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Charles Keepax 2014-05-30 13:19:17 +01:00 committed by Chanwoo Choi
parent e368f52521
commit 24a279b1ca
1 changed files with 10 additions and 5 deletions
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15
drivers/extcon/extcon-arizona.c
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@ -329,14 +329,17 @@ static void arizona_stop_mic(struct arizona_extcon_info *info)
}
static struct {
unsigned int threshold;
unsigned int factor_a;
unsigned int factor_b;
} arizona_hpdet_b_ranges[] = {
{ 5528, 362464 },
{ 11084, 6186851 },
{ 11065, 65460395 },
{ 100, 5528, 362464 },
{ 169, 11084, 6186851 },
{ 169, 11065, 65460395 },
};
#define ARIZONA_HPDET_B_RANGE_MAX 0x3fb
static struct {
int min;
int max;
@ -391,7 +394,8 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
>> ARIZONA_HP_IMPEDANCE_RANGE_SHIFT;
if (range < ARRAY_SIZE(arizona_hpdet_b_ranges) - 1 &&
(val < 100 || val >= 0x3fb)) {
(val < arizona_hpdet_b_ranges[range].threshold ||
val >= ARIZONA_HPDET_B_RANGE_MAX)) {
range++;
dev_dbg(arizona->dev, "Moving to HPDET range %d\n",
range);
@ -404,7 +408,8 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
}
/* If we go out of range report top of range */
if (val < 100 || val >= 0x3fb) {
if (val < arizona_hpdet_b_ranges[range].threshold ||
val >= ARIZONA_HPDET_B_RANGE_MAX) {
dev_dbg(arizona->dev, "Measurement out of range\n");
return ARIZONA_HPDET_MAX;
}