diff options
Diffstat (limited to 'nuttx/drivers/usbhost/usbhost_registerclass.c')
-rw-r--r-- | nuttx/drivers/usbhost/usbhost_registerclass.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/nuttx/drivers/usbhost/usbhost_registerclass.c b/nuttx/drivers/usbhost/usbhost_registerclass.c new file mode 100644 index 000000000..76ef511af --- /dev/null +++ b/nuttx/drivers/usbhost/usbhost_registerclass.c @@ -0,0 +1,117 @@ +/**************************************************************************** + * drivers/usbhost/usbhost_registerclass.c + * + * Copyright (C) 2010 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> +#include <errno.h> +#include <debug.h> + +#include <arch/irq.h> +#include <nuttx/usb/usbhost.h> + +#include "usbhost_registry.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: usbhost_registerclass + * + * Description: + * Register a USB host class implementation. The caller provides an + * instance of struct usbhost_registry_s that contains all of the + * information that will be needed later to (1) associate the USB host + * class implementation with a connected USB device, and (2) to obtain and + * bind a struct usbhost_class_s instance for the device. + * + * Input Parameters: + * class - An write-able instance of struct usbhost_registry_s that will be + * maintained in a registry. + * + * Returned Values: + * On success, this function will return zero (OK). Otherwise, a negated + * errno value is returned. + * + ****************************************************************************/ + +int usbhost_registerclass(struct usbhost_registry_s *class) +{ + irqstate_t flags; + + uvdbg("Registering class:%p nids:%d\n", class, class->nids); + + /* g_classregistry is a singly-linkedlist of class ID information added by + * calls to usbhost_registerclass(). Since this list is accessed from USB + * host controller interrupt handling logic, accesses to this list must be + * protected by disabling interrupts. + */ + + flags = irqsave(); + + /* Add the new class ID info to the head of the list */ + + class->flink = g_classregistry; + g_classregistry = class; + + irqrestore(flags); + return OK; +} + |