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usb: gadget: add usb_gadget_activate/deactivate functions

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These functions allows to deactivate gadget to make it not visible to
host and make it active again when gadget driver is finally ready.

They are needed to fix usb_function_activate() and usb_function_deactivate()
functions which currently are not working as usb_gadget_connect() is
called immediately after function bind regardless to previous calls of
usb_gadget_disconnect() function.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Robert Baldyga 2015-05-04 14:55:11 +02:00 committed by Felipe Balbi
parent 351169933e
commit ccdf138fe3
1 changed files with 95 additions and 7 deletions
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102
include/linux/usb/gadget.h
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@ -526,6 +526,9 @@ struct usb_gadget_ops {
* @quirk_ep_out_aligned_size: epout requires buffer size to be aligned to
* MaxPacketSize.
* @is_selfpowered: if the gadget is self-powered.
* @deactivated: True if gadget is deactivated - in deactivated state it cannot
* be connected.
* @connected: True if gadget is connected.
*
* Gadgets have a mostly-portable "gadget driver" implementing device
* functions, handling all usb configurations and interfaces. Gadget
@ -568,6 +571,8 @@ struct usb_gadget {
unsigned a_alt_hnp_support:1;
unsigned quirk_ep_out_aligned_size:1;
unsigned is_selfpowered:1;
unsigned deactivated:1;
unsigned connected:1;
};
#define work_to_gadget(w) (container_of((w), struct usb_gadget, work))
@ -771,9 +776,24 @@ static inline int usb_gadget_vbus_disconnect(struct usb_gadget *gadget)
*/
static inline int usb_gadget_connect(struct usb_gadget *gadget)
{
int ret;
if (!gadget->ops->pullup)
return -EOPNOTSUPP;
return gadget->ops->pullup(gadget, 1);
if (gadget->deactivated) {
/*
* If gadget is deactivated we only save new state.
* Gadget will be connected automatically after activation.
*/
gadget->connected = true;
return 0;
}
ret = gadget->ops->pullup(gadget, 1);
if (!ret)
gadget->connected = 1;
return ret;
}
/**
@ -784,20 +804,88 @@ static inline int usb_gadget_connect(struct usb_gadget *gadget)
* as a disconnect (when a VBUS session is active). Not all systems
* support software pullup controls.
*
* This routine may be used during the gadget driver bind() call to prevent
* the peripheral from ever being visible to the USB host, unless later
* usb_gadget_connect() is called. For example, user mode components may
* need to be activated before the system can talk to hosts.
*
* Returns zero on success, else negative errno.
*/
static inline int usb_gadget_disconnect(struct usb_gadget *gadget)
{
int ret;
if (!gadget->ops->pullup)
return -EOPNOTSUPP;
return gadget->ops->pullup(gadget, 0);
if (gadget->deactivated) {
/*
* If gadget is deactivated we only save new state.
* Gadget will stay disconnected after activation.
*/
gadget->connected = false;
return 0;
}
ret = gadget->ops->pullup(gadget, 0);
if (!ret)
gadget->connected = 0;
return ret;
}
/**
* usb_gadget_deactivate - deactivate function which is not ready to work
* @gadget: the peripheral being deactivated
*
* This routine may be used during the gadget driver bind() call to prevent
* the peripheral from ever being visible to the USB host, unless later
* usb_gadget_activate() is called. For example, user mode components may
* need to be activated before the system can talk to hosts.
*
* Returns zero on success, else negative errno.
*/
static inline int usb_gadget_deactivate(struct usb_gadget *gadget)
{
int ret;
if (gadget->deactivated)
return 0;
if (gadget->connected) {
ret = usb_gadget_disconnect(gadget);
if (ret)
return ret;
/*
* If gadget was being connected before deactivation, we want
* to reconnect it in usb_gadget_activate().
*/
gadget->connected = true;
}
gadget->deactivated = true;
return 0;
}
/**
* usb_gadget_activate - activate function which is not ready to work
* @gadget: the peripheral being activated
*
* This routine activates gadget which was previously deactivated with
* usb_gadget_deactivate() call. It calls usb_gadget_connect() if needed.
*
* Returns zero on success, else negative errno.
*/
static inline int usb_gadget_activate(struct usb_gadget *gadget)
{
if (!gadget->deactivated)
return 0;
gadget->deactivated = false;
/*
* If gadget has been connected before deactivation, or became connected
* while it was being deactivated, we call usb_gadget_connect().
*/
if (gadget->connected)
return usb_gadget_connect(gadget);
return 0;
}
/*-------------------------------------------------------------------------*/