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authorLaxman Dewangan <ldewangan@nvidia.com>2013-07-09 18:34:22 +0530
committerChanwoo Choi <cw00.choi@samsung.com>2013-08-05 08:53:34 +0900
commit002945f014ab51c470fdbd30b199fa85f715280d (patch)
tree13a25899562aef60b583952d61d98dd6b016cebf /drivers/extcon
parent43e3f38892a6a521ff5901cdb97cf6985101badd (diff)
downloadlinux-002945f014ab51c470fdbd30b199fa85f715280d.tar.bz2
extcon: palmas: enable ID_GND and ID_FLOAT detection always
When integrating driver with Tegra platform, it is found that the ID pins get detected only once after booting system and further removal and re-insert does not detect the ID pin. Fixing this issue with enabling interrupt on ID_GND and ID_FLOAT always and clearing the status on LATCH register which actually occurred. Also if interrupt occurs with line status as zero then based on previous status, set the cable state. Add debug prints to display the cable state when any cable insertion/removal happen. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Acked-by: Graeme Gregory <gg@slimlogic.co.uk> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-palmas.c24
1 files changed, 11 insertions, 13 deletions
diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index 7350ac2ec5e4..ef77a461ca39 100644
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -57,6 +57,7 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
extcon_set_cable_state(&palmas_usb->edev, "USB", true);
+ dev_info(palmas_usb->dev, "USB cable is attached\n");
} else {
dev_dbg(palmas_usb->dev,
"Spurious connect event detected\n");
@@ -65,6 +66,7 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
extcon_set_cable_state(&palmas_usb->edev, "USB", false);
+ dev_info(palmas_usb->dev, "USB cable is detached\n");
} else {
dev_dbg(palmas_usb->dev,
"Spurious disconnect event detected\n");
@@ -84,28 +86,23 @@ static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
- PALMAS_USB_ID_INT_EN_HI_SET,
- PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
- palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
- PALMAS_USB_ID_INT_EN_HI_CLR,
- PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
- palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_INT_LATCH_CLR,
PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
palmas_usb->linkstat = PALMAS_USB_STATE_ID;
extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
+ dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
} else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
- PALMAS_USB_ID_INT_EN_HI_SET,
- PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
- palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
- PALMAS_USB_ID_INT_EN_HI_CLR,
- PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
- palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_INT_LATCH_CLR,
PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
+ dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
+ } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
+ (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
+ palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+ extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
+ dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
}
return IRQ_HANDLED;
@@ -122,7 +119,8 @@ static void palmas_enable_irq(struct palmas_usb *palmas_usb)
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_INT_EN_HI_SET,
- PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);