Hi Laxman,
On 07/09/2013 10:04 PM, Laxman Dewangan wrote:
> 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@xxxxxxxxxx>
> ---
> drivers/extcon/extcon-palmas.c | 24 +++++++++++-------------
> 1 files changed, 11 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
> index b752a0a..587034b 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 state: TRUE\n");
I prfer following info message when USB cable is inserted.
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 state: FALSE\n");
ditto.
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, "HOST cable state: TRUE\n");
ditto.
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, "HOST cable state: FALSE\n");
ditto.
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, "HOST cable state: FALSE\n");
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);
>
>
I you would modify info message, anything else is good.
Thanks,
Chanwoo Choi
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