171 lines
3.9 KiB
C
171 lines
3.9 KiB
C
/*
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* Copyright (c) 2015-2016 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <string.h>
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#include <device.h>
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#include <sys/util.h>
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#include <sys/atomic.h>
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#include <syscall_handler.h>
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extern struct device __device_init_start[];
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extern struct device __device_PRE_KERNEL_1_start[];
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extern struct device __device_PRE_KERNEL_2_start[];
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extern struct device __device_POST_KERNEL_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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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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extern u32_t __device_busy_start[];
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extern u32_t __device_busy_end[];
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#define DEVICE_BUSY_SIZE (__device_busy_end - __device_busy_start)
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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 z_sys_device_do_config_level(s32_t level)
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{
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struct device *info;
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static struct device *config_levels[] = {
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__device_PRE_KERNEL_1_start,
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__device_PRE_KERNEL_2_start,
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__device_POST_KERNEL_start,
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__device_APPLICATION_start,
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/* End marker */
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__device_init_end,
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};
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for (info = config_levels[level]; info < config_levels[level+1];
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info++) {
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int retval;
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struct device_config *device_conf = info->config;
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retval = device_conf->init(info);
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if (retval != 0) {
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/* Initialization failed. Clear the API struct so that
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* device_get_binding() will not succeed for it.
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*/
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info->driver_api = NULL;
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} else {
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z_object_init(info);
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}
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}
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}
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struct device *z_impl_device_get_binding(const char *name)
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{
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struct device *info;
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/* Split the search into two loops: in the common scenario, where
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* device names are stored in ROM (and are referenced by the user
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* with CONFIG_* macros), only cheap pointer comparisons will be
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* performed. Reserve string comparisons for a fallback.
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*/
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for (info = __device_init_start; info != __device_init_end; info++) {
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if ((info->driver_api != NULL) &&
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(info->config->name == name)) {
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return info;
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}
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}
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for (info = __device_init_start; info != __device_init_end; info++) {
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if (info->driver_api == NULL) {
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continue;
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}
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if (strcmp(name, info->config->name) == 0) {
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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_USERSPACE
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Z_SYSCALL_HANDLER(device_get_binding, name)
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{
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char name_copy[Z_DEVICE_MAX_NAME_LEN];
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if (z_user_string_copy(name_copy, (char *)name, sizeof(name_copy))
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!= 0) {
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return 0;
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}
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return (u32_t)z_impl_device_get_binding(name_copy);
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}
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#endif /* CONFIG_USERSPACE */
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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int device_pm_control_nop(struct device *unused_device,
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u32_t unused_ctrl_command,
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void *unused_context,
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device_pm_cb cb,
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void *unused_arg)
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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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int device_any_busy_check(void)
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{
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int i = 0;
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for (i = 0; i < DEVICE_BUSY_SIZE; i++) {
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if (__device_busy_start[i] != 0U) {
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return -EBUSY;
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}
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}
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return 0;
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}
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int device_busy_check(struct device *chk_dev)
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{
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if (atomic_test_bit((const atomic_t *)__device_busy_start,
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(chk_dev - __device_init_start))) {
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return -EBUSY;
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}
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return 0;
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}
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#endif
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void device_busy_set(struct device *busy_dev)
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{
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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atomic_set_bit((atomic_t *) __device_busy_start,
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(busy_dev - __device_init_start));
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#else
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ARG_UNUSED(busy_dev);
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#endif
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}
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void device_busy_clear(struct device *busy_dev)
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{
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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atomic_clear_bit((atomic_t *) __device_busy_start,
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(busy_dev - __device_init_start));
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#else
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ARG_UNUSED(busy_dev);
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#endif
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}
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