From cd59e79656f4e7137909166248a935d422b1245a Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Mon, 1 Apr 2013 19:21:48 +0100 Subject: extcon: arizona: Allow additional debounce during microphone detection Help mitigate against mechanical bounce during the initial detection by allowing the configuration of an additional debounce on top of that the hardware does during the initial phase of microphone detection operation. Signed-off-by: Mark Brown --- drivers/extcon/extcon-arizona.c | 35 ++++++++++++++++++++++++++++++----- include/linux/mfd/arizona/pdata.h | 3 +++ 2 files changed, 33 insertions(+), 5 deletions(-) diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c index 26f9a1ae15c4..c7f8eb4299d2 100644 --- a/drivers/extcon/extcon-arizona.c +++ b/drivers/extcon/extcon-arizona.c @@ -64,6 +64,7 @@ struct arizona_extcon_info { bool micd_clamp; struct delayed_work hpdet_work; + struct delayed_work micd_detect_work; struct delayed_work micd_timeout_work; bool hpdet_active; @@ -750,9 +751,11 @@ static void arizona_micd_timeout_work(struct work_struct *work) mutex_unlock(&info->lock); } -static irqreturn_t arizona_micdet(int irq, void *data) +static void arizona_micd_detect(struct work_struct *work) { - struct arizona_extcon_info *info = data; + struct arizona_extcon_info *info = container_of(work, + struct arizona_extcon_info, + micd_detect_work.work); struct arizona *arizona = info->arizona; unsigned int val = 0, lvl; int ret, i, key; @@ -766,7 +769,7 @@ static irqreturn_t arizona_micdet(int irq, void *data) if (ret != 0) { dev_err(arizona->dev, "Failed to read MICDET: %d\n", ret); mutex_unlock(&info->lock); - return IRQ_NONE; + return; } dev_dbg(arizona->dev, "MICDET: %x\n", val); @@ -774,14 +777,14 @@ static irqreturn_t arizona_micdet(int irq, void *data) if (!(val & ARIZONA_MICD_VALID)) { dev_warn(arizona->dev, "Microphone detection state invalid\n"); mutex_unlock(&info->lock); - return IRQ_NONE; + return; } } if (i == 10 && !(val & 0x7fc)) { dev_err(arizona->dev, "Failed to get valid MICDET value\n"); mutex_unlock(&info->lock); - return IRQ_NONE; + return; } /* Due to jack detect this should never happen */ @@ -890,6 +893,27 @@ handled: pm_runtime_mark_last_busy(info->dev); mutex_unlock(&info->lock); +} + +static irqreturn_t arizona_micdet(int irq, void *data) +{ + struct arizona_extcon_info *info = data; + struct arizona *arizona = info->arizona; + int debounce = arizona->pdata.micd_detect_debounce; + + cancel_delayed_work_sync(&info->micd_detect_work); + cancel_delayed_work_sync(&info->micd_timeout_work); + + mutex_lock(&info->lock); + if (!info->detecting) + debounce = 0; + mutex_unlock(&info->lock); + + if (debounce) + schedule_delayed_work(&info->micd_detect_work, + msecs_to_jiffies(debounce)); + else + arizona_micd_detect(&info->micd_detect_work.work); return IRQ_HANDLED; } @@ -1072,6 +1096,7 @@ static int arizona_extcon_probe(struct platform_device *pdev) info->dev = &pdev->dev; info->last_jackdet = ~(ARIZONA_MICD_CLAMP_STS | ARIZONA_JD1_STS); INIT_DELAYED_WORK(&info->hpdet_work, arizona_hpdet_work); + INIT_DELAYED_WORK(&info->micd_detect_work, arizona_micd_detect); INIT_DELAYED_WORK(&info->micd_timeout_work, arizona_micd_timeout_work); platform_set_drvdata(pdev, info); diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h index 45c84777c624..3ef300baa2e6 100644 --- a/include/linux/mfd/arizona/pdata.h +++ b/include/linux/mfd/arizona/pdata.h @@ -134,6 +134,9 @@ struct arizona_pdata { /** GPIO used for mic isolation with HPDET */ int hpdet_id_gpio; + /** Extra debounce timeout used during initial mic detection (ms) */ + int micd_detect_debounce; + /** GPIO for mic detection polarity */ int micd_pol_gpio; -- cgit v1.2.3