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author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-21 15:52:04 +1100 |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-21 15:52:04 +1100 |
commit | a02efb906d12c9d4eb2ab7c59049ba9545e5412d (patch) | |
tree | bf1f6467978ec63a22f42299ecac2ee7f7e73336 /drivers/usb/gadget/composite.c | |
parent | 84dfcb4b318463cd4883b6a19937824f49aee564 (diff) | |
parent | 2515ddc6db8eb49a79f0fe5e67ff09ac7c81eab4 (diff) | |
download | blackbird-op-linux-a02efb906d12c9d4eb2ab7c59049ba9545e5412d.tar.gz blackbird-op-linux-a02efb906d12c9d4eb2ab7c59049ba9545e5412d.zip |
Merge commit 'origin' into master
Manual merge of:
arch/powerpc/Kconfig
arch/powerpc/include/asm/page.h
Diffstat (limited to 'drivers/usb/gadget/composite.c')
-rw-r--r-- | drivers/usb/gadget/composite.c | 68 |
1 files changed, 66 insertions, 2 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 85c876c1f150..f2da0269e1b1 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -128,6 +128,70 @@ done: } /** + * usb_function_deactivate - prevent function and gadget enumeration + * @function: the function that isn't yet ready to respond + * + * Blocks response of the gadget driver to host enumeration by + * preventing the data line pullup from being activated. This is + * normally called during @bind() processing to change from the + * initial "ready to respond" state, or when a required resource + * becomes available. + * + * For example, drivers that serve as a passthrough to a userspace + * daemon can block enumeration unless that daemon (such as an OBEX, + * MTP, or print server) is ready to handle host requests. + * + * Not all systems support software control of their USB peripheral + * data pullups. + * + * Returns zero on success, else negative errno. + */ +int usb_function_deactivate(struct usb_function *function) +{ + struct usb_composite_dev *cdev = function->config->cdev; + int status = 0; + + spin_lock(&cdev->lock); + + if (cdev->deactivations == 0) + status = usb_gadget_disconnect(cdev->gadget); + if (status == 0) + cdev->deactivations++; + + spin_unlock(&cdev->lock); + return status; +} + +/** + * usb_function_activate - allow function and gadget enumeration + * @function: function on which usb_function_activate() was called + * + * Reverses effect of usb_function_deactivate(). If no more functions + * are delaying their activation, the gadget driver will respond to + * host enumeration procedures. + * + * Returns zero on success, else negative errno. + */ +int usb_function_activate(struct usb_function *function) +{ + struct usb_composite_dev *cdev = function->config->cdev; + int status = 0; + + spin_lock(&cdev->lock); + + if (WARN_ON(cdev->deactivations == 0)) + status = -EINVAL; + else { + cdev->deactivations--; + if (cdev->deactivations == 0) + status = usb_gadget_connect(cdev->gadget); + } + + spin_unlock(&cdev->lock); + return status; +} + +/** * usb_interface_id() - allocate an unused interface ID * @config: configuration associated with the interface * @function: function handling the interface @@ -181,7 +245,7 @@ static int config_buf(struct usb_configuration *config, c->bConfigurationValue = config->bConfigurationValue; c->iConfiguration = config->iConfiguration; c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; - c->bMaxPower = config->bMaxPower; + c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2); /* There may be e.g. OTG descriptors */ if (config->descriptors) { @@ -368,7 +432,7 @@ static int set_config(struct usb_composite_dev *cdev, } /* when we return, be sure our power usage is valid */ - power = 2 * c->bMaxPower; + power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW; done: usb_gadget_vbus_draw(gadget, power); return result; |