From 0e2738f59c6db185a70a683059980bd2296571ca Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Thu, 6 Dec 2012 21:36:18 +0900 Subject: extcon: max77693: Fix bug when detecting MHL/Dock-Audio with USB/TA cable This patch fix bug that muic couldn't detect MHL/Dock-Audio with USB/TA cable on exception situation. I explain detail case on following: When MHL(with USB/TA cable) or Dock-Audio with USB/TA cable is attached, the MUIC device happen following two interrupt. - 'MAX77693_MUIC_IRQ_INT1_ADC' for detecting MHL/Dock-Audio. - 'MAX77693_MUIC_IRQ_INT2_CHGTYP' for detecting USB/TA cable connected to MHL/Dock-Audio. Always, happen eariler MAX77693_MUIC_IRQ_INT1_ADC interrupt than MAX77693_MUIC_IRQ_INT2_CHGTYP interrupt. If user attach MHL with USB/TA cable and immediately detach MHL with USB/TA cable before MAX77693_MUIC_IRQ_INT2_CHGTYP interrupt is happened, USB/TA connected to MHL cable remain connected state to target. But USB/TA connected to MHL cable isn't connected to target. user be faced with unusual action. So, driver should check this situation in spite of that, previous charger type is N/A. Signed-off-by: Chanwoo Choi Signed-off-by: Myungjoo Ham --- drivers/extcon/extcon-max77693.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'drivers/extcon') diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c index abab068adc3..28eff88fca1 100644 --- a/drivers/extcon/extcon-max77693.c +++ b/drivers/extcon/extcon-max77693.c @@ -737,6 +737,7 @@ static int max77693_muic_chg_handler(struct max77693_muic_info *info) switch (chg_type) { case MAX77693_CHARGER_TYPE_USB: + case MAX77693_CHARGER_TYPE_NONE: /* * MHL_TA(USB/TA) with MHL cable * - MHL cable include two port(HDMI line and separate micro @@ -778,6 +779,25 @@ static int max77693_muic_chg_handler(struct max77693_muic_info *info) goto out; } + /* + * When MHL(with USB/TA cable) or Dock-Audio with USB/TA cable + * is attached, muic device happen below two interrupt. + * - 'MAX77693_MUIC_IRQ_INT1_ADC' for detecting MHL/Dock-Audio. + * - 'MAX77693_MUIC_IRQ_INT2_CHGTYP' for detecting USB/TA cable + * connected to MHL or Dock-Audio. + * Always, happen eariler MAX77693_MUIC_IRQ_INT1_ADC interrupt + * than MAX77693_MUIC_IRQ_INT2_CHGTYP interrupt. + * + * If user attach MHL (with USB/TA cable and immediately detach + * MHL with USB/TA cable before MAX77693_MUIC_IRQ_INT2_CHGTYP + * interrupt is happened, USB/TA cable remain connected state to + * target. But USB/TA cable isn't connected to target. The user + * be face with unusual action. So, driver should check this + * situation in spite of, that previous charger type is N/A. + */ + if (chg_type == MAX77693_CHARGER_TYPE_NONE) + break; + /* Only USB cable, PATH:AP_USB */ ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached); if (ret < 0) -- cgit v1.2.3