diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-01 19:09:45 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-02 11:54:00 +0100 |
| commit | 9dd5e53d9d2f933039eb2d5e4052afa249f638ba (patch) | |
| tree | 68c984efef69cce9f1e8f70097b01ff357a5f690 /drivers/extcon | |
| parent | 2643fd641af28603ccd42244011a5ebc66016f8f (diff) | |
| download | linux-9dd5e53d9d2f933039eb2d5e4052afa249f638ba.tar.bz2 | |
extcon: arizona: Retry HPDET identification for high impedance
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>
Diffstat (limited to 'drivers/extcon')
| -rw-r--r-- | drivers/extcon/extcon-arizona.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c index 5344f435f689..c18cf14067c6 100644 --- a/drivers/extcon/extcon-arizona.c +++ b/drivers/extcon/extcon-arizona.c @@ -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, |