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extcon: arizona: Retry HPDET identification for high impedance

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Sometimes we can trigger measurements early if contacts are shorted during
a slow insertion. As well as debouncing add further robustness by retrying
if we get a high impedance measurement for headphones as this can indicate
that the headphones were not yet connected.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-04-01 19:09:45 +01:00
parent 2643fd641a
commit 9dd5e53d9d
1 changed files with 17 additions and 1 deletions
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18
drivers/extcon/extcon-arizona.c
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@ -39,6 +39,8 @@
#define ARIZONA_ACCDET_MODE_HPL 1
#define ARIZONA_ACCDET_MODE_HPR 2
#define ARIZONA_HPDET_MAX 10000
#define HPDET_DEBOUNCE 500
struct arizona_extcon_info {
@ -64,6 +66,7 @@ struct arizona_extcon_info {
bool hpdet_active;
bool hpdet_done;
bool hpdet_retried;
int num_hpdet_res;
unsigned int hpdet_res[3];
@ -112,6 +115,8 @@ static const char *arizona_cable[] = {
NULL,
};
static void arizona_start_hpdet_acc_id(struct arizona_extcon_info *info);
static void arizona_extcon_do_magic(struct arizona_extcon_info *info,
unsigned int magic)
{
@ -393,7 +398,7 @@ 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) {
dev_dbg(arizona->dev, "Measurement out of range\n");
return 10000;
return ARIZONA_HPDET_MAX;
}
dev_dbg(arizona->dev, "HPDET read %d in range %d\n",
@ -518,6 +523,16 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading)
/* Take the headphone impedance for the main report */
*reading = info->hpdet_res[0];
/* Sometimes we get false readings due to slow insert */
if (*reading >= ARIZONA_HPDET_MAX && !info->hpdet_retried) {
dev_dbg(arizona->dev, "Retrying high impedance\n");
info->num_hpdet_res = 0;
info->hpdet_retried = true;
arizona_start_hpdet_acc_id(info);
pm_runtime_put(info->dev);
return -EAGAIN;
}
/*
* Either the two grounds measure differently or we
* measure the mic as high impedance.
@ -953,6 +968,7 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
info->hpdet_res[i] = 0;
info->mic = false;
info->hpdet_done = false;
info->hpdet_retried = false;
for (i = 0; i < info->num_micd_ranges; i++)
input_report_key(info->input,