dd5e90ec6c
This changes the behavior of device_get_binding() so that it returns NULL if driver_api is not set. This provides a way for driver to state that it has not been initialized properly, and prevents app from using it since no reference to the device struct will be returned. This implements the idea specified in [1]. The idea is to reuse an existing resource by piggy-backing onto driver_api, thus avoiding an extra "device state" variable in the device struct. This differs from the code specified in the mailing list by checking driver_api for NULL first. This avoids the unnecessary strcmp() if driver_api is NULL. [1] https://lists.zephyrproject.org/archives/list/devel@lists.zephyrproject.org/message/MZB5PYBSRHV3NIEHJYXYQVLTPFIIHPB3/ Change-Id: I978b1a6683cd56c8a72532d6368c47e67515c82d Signed-off-by: Daniel Leung <daniel.leung@intel.com>
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*
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* Copyright (c) 2015-2016 Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <device.h>
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#include <misc/util.h>
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extern struct device __device_init_start[];
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extern struct device __device_PRIMARY_start[];
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extern struct device __device_SECONDARY_start[];
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extern struct device __device_NANOKERNEL_start[];
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extern struct device __device_MICROKERNEL_start[];
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extern struct device __device_APPLICATION_start[];
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extern struct device __device_init_end[];
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static struct device *config_levels[] = {
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__device_PRIMARY_start,
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__device_SECONDARY_start,
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__device_NANOKERNEL_start,
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__device_MICROKERNEL_start,
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__device_APPLICATION_start,
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__device_init_end,
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};
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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struct device_pm_ops device_pm_ops_nop = {device_pm_nop, device_pm_nop};
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#endif
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/**
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* @brief Execute all the device initialization functions at a given level
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*
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* @details Invokes the initialization routine for each device object
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* created by the DEVICE_INIT() macro using the specified level.
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* The linker script places the device objects in memory in the order
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* they need to be invoked, with symbols indicating where one level leaves
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* off and the next one begins.
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*
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* @param level init level to run.
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*/
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void _sys_device_do_config_level(int level)
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{
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struct device *info;
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for (info = config_levels[level]; info < config_levels[level+1]; info++) {
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struct device_config *device = info->config;
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device->init(info);
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}
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}
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/**
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* @brief Retrieve the device structure for a driver by name
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*
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* @details Device objects are created via the DEVICE_INIT() macro and
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* placed in memory by the linker. If a driver needs to bind to another driver
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* it can use this function to retrieve the device structure of the lower level
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* driver by the name the driver exposes to the system.
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*
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* @param name device name to search for.
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*
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* @return pointer to device structure; NULL if not found or cannot be used.
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*/
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struct device *device_get_binding(char *name)
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{
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struct device *info;
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for (info = __device_init_start; info != __device_init_end; info++) {
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if (info->driver_api && !strcmp(name, info->config->name)) {
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return info;
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}
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}
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return NULL;
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}
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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int device_pm_nop(struct device *unused_device, int unused_policy)
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{
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return 0;
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}
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void device_list_get(struct device **device_list, int *device_count)
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{
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*device_list = __device_init_start;
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*device_count = __device_init_end - __device_init_start;
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}
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#endif
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