RE: [RESEND PATCH v11 3/4] gadget: Integrate with the usb gadget supporting for usb charger

[Jun Li]

Hi

> -Original Message-
> From: linux-usb-ow...@vger.kernel.org [mailto:linux-usb-
> ow...@vger.kernel.org] On Behalf Of Baolin Wang
> Sent: Monday, June 13, 2016 4:47 PM
> To: ba...@kernel.org; gre...@linuxfoundation.org; s...@kernel.org;
> dbarysh...@gmail.com; dw...@infradead.org
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> Subject: [RESEND PATCH v11 3/4] gadget: Integrate with the usb gadget
> supporting for usb charger
> 
> When the usb gadget supporting for usb charger is ready, the usb charger
> can implement the usb_charger_plug_by_gadget() function and
> usb_charger_exit() function by getting 'struct usb_charger' from 'struct
> gadget'.
> 
> Signed-off-by: Baolin Wang <baolin.w...@linaro.org>

Reviewed-by: Li Jun <jun...@nxp.com>
Tested-by: Li Jun <jun...@nxp.com>

> ---
>  drivers/usb/gadget/udc/charger.c |   39
> +-
>  1 file changed, 38 insertions(+), 1 deletion(-)
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[RESEND PATCH v11 3/4] gadget: Integrate with the usb gadget supporting for usb charger

[Baolin Wang]

When the usb gadget supporting for usb charger is ready, the usb charger
can implement the usb_charger_plug_by_gadget() function and usb_charger_exit()
function by getting 'struct usb_charger' from 'struct gadget'.

Signed-off-by: Baolin Wang 
---
 drivers/usb/gadget/udc/charger.c |   39 +-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/charger.c b/drivers/usb/gadget/udc/charger.c
index 7be4c76..949396f 100644
--- a/drivers/usb/gadget/udc/charger.c
+++ b/drivers/usb/gadget/udc/charger.c
@@ -568,6 +568,30 @@ usb_charger_plug_by_extcon(struct notifier_block *nb,
 int usb_charger_plug_by_gadget(struct usb_gadget *gadget,
   unsigned long state)
 {
+   struct usb_charger *uchger = gadget->charger;
+   enum usb_charger_state uchger_state;
+
+   if (WARN(!uchger, "charger can not be NULL"))
+   return -EINVAL;
+
+   /*
+* Report event to power to setting the current limitation
+* for this usb charger when one usb charger state is changed
+* with detecting by usb gadget state.
+*/
+   if (uchger->old_gadget_state != state) {
+   uchger->old_gadget_state = state;
+
+   if (state >= USB_STATE_ATTACHED)
+   uchger_state = USB_CHARGER_PRESENT;
+   else if (state == USB_STATE_NOTATTACHED)
+   uchger_state = USB_CHARGER_REMOVE;
+   else
+   uchger_state = USB_CHARGER_DEFAULT;
+
+   usb_charger_notify_others(uchger, uchger_state);
+   }
+
return 0;
 }
 EXPORT_SYMBOL_GPL(usb_charger_plug_by_gadget);
@@ -724,6 +748,7 @@ int usb_charger_init(struct usb_gadget *ugadget)
 
/* register a notifier on a usb gadget device */
uchger->gadget = ugadget;
+   ugadget->charger = uchger;
uchger->old_gadget_state = USB_STATE_NOTATTACHED;
 
/* register a new usb charger */
@@ -744,7 +769,19 @@ fail:
 
 int usb_charger_exit(struct usb_gadget *ugadget)
 {
-   return 0;
+   struct usb_charger *uchger = ugadget->charger;
+
+   if (WARN(!uchger, "charger can not be NULL"))
+   return -EINVAL;
+
+   if (uchger->extcon_dev)
+   extcon_unregister_notifier(uchger->extcon_dev,
+  EXTCON_USB,
+  >extcon_nb.nb);
+
+   ida_simple_remove(_charger_ida, uchger->id);
+
+   return usb_charger_unregister(uchger);
 }
 
 static int __init usb_charger_class_init(void)
-- 
1.7.9.5

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