438 lines
13 KiB
C
438 lines
13 KiB
C
|
|
/*
|
|
* Copyright (c) 2015 Intel Corporation.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#ifndef ZEPHYR_INCLUDE_DEVICE_H_
|
|
#define ZEPHYR_INCLUDE_DEVICE_H_
|
|
|
|
#include <kernel.h>
|
|
|
|
/**
|
|
* @brief Device Driver APIs
|
|
* @defgroup io_interfaces Device Driver APIs
|
|
* @{
|
|
* @}
|
|
*/
|
|
/**
|
|
* @brief Device Model APIs
|
|
* @defgroup device_model Device Model APIs
|
|
* @{
|
|
*/
|
|
|
|
#include <zephyr/types.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
static const int _INIT_LEVEL_PRE_KERNEL_1 = 1;
|
|
static const int _INIT_LEVEL_PRE_KERNEL_2 = 1;
|
|
static const int _INIT_LEVEL_POST_KERNEL = 1;
|
|
static const int _INIT_LEVEL_APPLICATION = 1;
|
|
|
|
/**
|
|
* @def DEVICE_INIT
|
|
*
|
|
* @brief Create device object and set it up for boot time initialization.
|
|
*
|
|
* @details This macro defines a device object that is automatically
|
|
* configured by the kernel during system initialization.
|
|
*
|
|
* @param dev_name Device name.
|
|
*
|
|
* @param drv_name The name this instance of the driver exposes to
|
|
* the system.
|
|
*
|
|
* @param init_fn Address to the init function of the driver.
|
|
*
|
|
* @param data Pointer to the device's configuration data.
|
|
*
|
|
* @param cfg_info The address to the structure containing the
|
|
* configuration information for this instance of the driver.
|
|
*
|
|
* @param level The initialization level at which configuration occurs.
|
|
* Must be one of the following symbols, which are listed in the order
|
|
* they are performed by the kernel:
|
|
* \n
|
|
* \li PRE_KERNEL_1: Used for devices that have no dependencies, such as those
|
|
* that rely solely on hardware present in the processor/SOC. These devices
|
|
* cannot use any kernel services during configuration, since they are not
|
|
* yet available.
|
|
* \n
|
|
* \li PRE_KERNEL_2: Used for devices that rely on the initialization of devices
|
|
* initialized as part of the PRIMARY level. These devices cannot use any
|
|
* kernel services during configuration, since they are not yet available.
|
|
* \n
|
|
* \li POST_KERNEL: Used for devices that require kernel services during
|
|
* configuration.
|
|
* \n
|
|
* \li APPLICATION: Used for application components (i.e. non-kernel components)
|
|
* that need automatic configuration. These devices can use all services
|
|
* provided by the kernel during configuration.
|
|
*
|
|
* @param prio The initialization priority of the device, relative to
|
|
* other devices of the same initialization level. Specified as an integer
|
|
* value in the range 0 to 99; lower values indicate earlier initialization.
|
|
* Must be a decimal integer literal without leading zeroes or sign (e.g. 32),
|
|
* or an equivalent symbolic name (e.g. \#define MY_INIT_PRIO 32); symbolic
|
|
* expressions are *not* permitted
|
|
* (e.g. CONFIG_KERNEL_INIT_PRIORITY_DEFAULT + 5).
|
|
*/
|
|
#define DEVICE_INIT(dev_name, drv_name, init_fn, data, cfg_info, level, prio) \
|
|
DEVICE_AND_API_INIT(dev_name, drv_name, init_fn, data, cfg_info, \
|
|
level, prio, NULL)
|
|
|
|
|
|
/**
|
|
* @def DEVICE_AND_API_INIT
|
|
*
|
|
* @brief Create device object and set it up for boot time initialization,
|
|
* with the option to set driver_api.
|
|
*
|
|
* @copydetails DEVICE_INIT
|
|
* @param api Provides an initial pointer to the API function struct
|
|
* used by the driver. Can be NULL.
|
|
* @details The driver api is also set here, eliminating the need to do that
|
|
* during initialization.
|
|
*/
|
|
#ifndef CONFIG_DEVICE_POWER_MANAGEMENT
|
|
#define DEVICE_AND_API_INIT(dev_name, drv_name, init_fn, data, cfg_info, \
|
|
level, prio, api) \
|
|
static struct device_config _CONCAT(__config_, dev_name) __used \
|
|
__attribute__((__section__(".devconfig.init"))) = { \
|
|
.name = drv_name, .init = (init_fn), \
|
|
.config_info = (cfg_info) \
|
|
}; \
|
|
static struct device _CONCAT(__device_, dev_name) __used \
|
|
__attribute__((__section__(".init_" #level STRINGIFY(prio)))) = { \
|
|
.config = &_CONCAT(__config_, dev_name), \
|
|
.driver_api = api, \
|
|
.driver_data = data \
|
|
}
|
|
#else
|
|
/*
|
|
* Use the default device_pm_control for devices that do not call the
|
|
* DEVICE_DEFINE macro so that caller of hook functions
|
|
* need not check device_pm_control != NULL.
|
|
*/
|
|
#define DEVICE_AND_API_INIT(dev_name, drv_name, init_fn, data, cfg_info, \
|
|
level, prio, api) \
|
|
DEVICE_DEFINE(dev_name, drv_name, init_fn, \
|
|
device_pm_control_nop, data, cfg_info, level, \
|
|
prio, api)
|
|
#endif
|
|
|
|
/**
|
|
* @def DEVICE_DEFINE
|
|
*
|
|
* @brief Create device object and set it up for boot time initialization,
|
|
* with the option to device_pm_control.
|
|
*
|
|
* @copydetails DEVICE_AND_API_INIT
|
|
* @param pm_control_fn Pointer to device_pm_control function.
|
|
* Can be empty function (device_pm_control_nop) if not implemented.
|
|
*/
|
|
#ifndef CONFIG_DEVICE_POWER_MANAGEMENT
|
|
#define DEVICE_DEFINE(dev_name, drv_name, init_fn, pm_control_fn, \
|
|
data, cfg_info, level, prio, api) \
|
|
DEVICE_AND_API_INIT(dev_name, drv_name, init_fn, data, cfg_info, \
|
|
level, prio, api)
|
|
#else
|
|
#define DEVICE_DEFINE(dev_name, drv_name, init_fn, pm_control_fn, \
|
|
data, cfg_info, level, prio, api) \
|
|
static struct device_config _CONCAT(__config_, dev_name) __used \
|
|
__attribute__((__section__(".devconfig.init"))) = { \
|
|
.name = drv_name, .init = (init_fn), \
|
|
.device_pm_control = (pm_control_fn), \
|
|
.config_info = (cfg_info) \
|
|
}; \
|
|
static struct device _CONCAT(__device_, dev_name) __used \
|
|
__attribute__((__section__(".init_" #level STRINGIFY(prio)))) = { \
|
|
.config = &_CONCAT(__config_, dev_name), \
|
|
.driver_api = api, \
|
|
.driver_data = data \
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @def DEVICE_NAME_GET
|
|
*
|
|
* @brief Expands to the full name of a global device object
|
|
*
|
|
* @details Return the full name of a device object symbol created by
|
|
* DEVICE_INIT(), using the dev_name provided to DEVICE_INIT().
|
|
*
|
|
* It is meant to be used for declaring extern symbols pointing on device
|
|
* objects before using the DEVICE_GET macro to get the device object.
|
|
*
|
|
* @param name The same as dev_name provided to DEVICE_INIT()
|
|
*
|
|
* @return The expanded name of the device object created by DEVICE_INIT()
|
|
*/
|
|
#define DEVICE_NAME_GET(name) (_CONCAT(__device_, name))
|
|
|
|
/**
|
|
* @def DEVICE_GET
|
|
*
|
|
* @brief Obtain a pointer to a device object by name
|
|
*
|
|
* @details Return the address of a device object created by
|
|
* DEVICE_INIT(), using the dev_name provided to DEVICE_INIT().
|
|
*
|
|
* @param name The same as dev_name provided to DEVICE_INIT()
|
|
*
|
|
* @return A pointer to the device object created by DEVICE_INIT()
|
|
*/
|
|
#define DEVICE_GET(name) (&DEVICE_NAME_GET(name))
|
|
|
|
/** @def DEVICE_DECLARE
|
|
*
|
|
* @brief Declare a static device object
|
|
*
|
|
* This macro can be used at the top-level to declare a device, such
|
|
* that DEVICE_GET() may be used before the full declaration in
|
|
* DEVICE_INIT().
|
|
*
|
|
* This is often useful when configuring interrupts statically in a
|
|
* device's init or per-instance config function, as the init function
|
|
* itself is required by DEVICE_INIT() and use of DEVICE_GET()
|
|
* inside it creates a circular dependency.
|
|
*
|
|
* @param name Device name
|
|
*/
|
|
#define DEVICE_DECLARE(name) static struct device DEVICE_NAME_GET(name)
|
|
|
|
struct device;
|
|
|
|
|
|
/**
|
|
* @brief Static device information (In ROM) Per driver instance
|
|
*
|
|
* @param name name of the device
|
|
* @param init init function for the driver
|
|
* @param config_info address of driver instance config information
|
|
*/
|
|
struct device_config {
|
|
const char *name;
|
|
int (*init)(struct device *device);
|
|
#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
|
|
int (*device_pm_control)(struct device *device, u32_t command,
|
|
void *context);
|
|
#endif
|
|
const void *config_info;
|
|
};
|
|
|
|
/**
|
|
* @brief Runtime device structure (In memory) Per driver instance
|
|
* @param device_config Build time config information
|
|
* @param driver_api pointer to structure containing the API functions for
|
|
* the device type. This pointer is filled in by the driver at init time.
|
|
* @param driver_data driver instance data. For driver use only
|
|
*/
|
|
struct device {
|
|
struct device_config *config;
|
|
const void *driver_api;
|
|
void *driver_data;
|
|
};
|
|
|
|
void _sys_device_do_config_level(int level);
|
|
|
|
/**
|
|
* @brief Retrieve the device structure for a driver by name
|
|
*
|
|
* @details Device objects are created via the DEVICE_INIT() macro and
|
|
* placed in memory by the linker. If a driver needs to bind to another driver
|
|
* it can use this function to retrieve the device structure of the lower level
|
|
* driver by the name the driver exposes to the system.
|
|
*
|
|
* @param name device name to search for.
|
|
*
|
|
* @return pointer to device structure; NULL if not found or cannot be used.
|
|
*/
|
|
struct device *device_get_binding(const char *name);
|
|
|
|
/**
|
|
* @brief Device Power Management APIs
|
|
* @defgroup device_power_management_api Device Power Management APIs
|
|
* @ingroup power_management_api
|
|
* @{
|
|
*/
|
|
|
|
#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
|
|
|
|
/** @def DEVICE_PM_ACTIVE_STATE
|
|
*
|
|
* @brief device is in ACTIVE power state
|
|
*
|
|
* @details Normal operation of the device. All device context is retained.
|
|
*/
|
|
#define DEVICE_PM_ACTIVE_STATE 1
|
|
|
|
/** @def DEVICE_PM_LOW_POWER_STATE
|
|
*
|
|
* @brief device is in LOW power state
|
|
*
|
|
* @details Device context is preserved by the HW and need not be
|
|
* restored by the driver.
|
|
*/
|
|
#define DEVICE_PM_LOW_POWER_STATE 2
|
|
|
|
/** @def DEVICE_PM_SUSPEND_STATE
|
|
*
|
|
* @brief device is in SUSPEND power state
|
|
*
|
|
* @details Most device context is lost by the hardware.
|
|
* Device drivers must save and restore or reinitialize any context
|
|
* lost by the hardware
|
|
*/
|
|
#define DEVICE_PM_SUSPEND_STATE 3
|
|
|
|
/** @def DEVICE_PM_OFF_STATE
|
|
*
|
|
* @brief device is in OFF power state
|
|
*
|
|
* @details - Power has been fully removed from the device.
|
|
* The device context is lost when this state is entered, so the OS
|
|
* software will reinitialize the device when powering it back on
|
|
*/
|
|
#define DEVICE_PM_OFF_STATE 4
|
|
|
|
/* Constants defining support device power commands */
|
|
#define DEVICE_PM_SET_POWER_STATE 1
|
|
#define DEVICE_PM_GET_POWER_STATE 2
|
|
|
|
#endif /* CONFIG_DEVICE_POWER_MANAGEMENT */
|
|
|
|
/**
|
|
* @brief Indicate that the device is in the middle of a transaction
|
|
*
|
|
* Called by a device driver to indicate that it is in the middle of a
|
|
* transaction.
|
|
*
|
|
* @param busy_dev Pointer to device structure of the driver instance.
|
|
*/
|
|
void device_busy_set(struct device *busy_dev);
|
|
|
|
/**
|
|
* @brief Indicate that the device has completed its transaction
|
|
*
|
|
* Called by a device driver to indicate the end of a transaction.
|
|
*
|
|
* @param busy_dev Pointer to device structure of the driver instance.
|
|
*/
|
|
void device_busy_clear(struct device *busy_dev);
|
|
|
|
#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
|
|
/*
|
|
* Device PM functions
|
|
*/
|
|
|
|
/**
|
|
* @brief No-op function to initialize unimplemented hook
|
|
*
|
|
* This function should be used to initialize device hook
|
|
* for which a device has no PM operations.
|
|
*
|
|
* @param unused_device Unused
|
|
* @param unused_ctrl_command Unused
|
|
* @param unused_context Unused
|
|
*
|
|
* @retval 0 Always returns 0
|
|
*/
|
|
int device_pm_control_nop(struct device *unused_device,
|
|
u32_t unused_ctrl_command, void *unused_context);
|
|
/**
|
|
* @brief Call the set power state function of a device
|
|
*
|
|
* Called by the application or power management service to let the device do
|
|
* required operations when moving to the required power state
|
|
* Note that devices may support just some of the device power states
|
|
* @param device Pointer to device structure of the driver instance.
|
|
* @param device_power_state Device power state to be set
|
|
*
|
|
* @retval 0 If successful.
|
|
* @retval Errno Negative errno code if failure.
|
|
*/
|
|
static inline int device_set_power_state(struct device *device,
|
|
u32_t device_power_state)
|
|
{
|
|
return device->config->device_pm_control(device,
|
|
DEVICE_PM_SET_POWER_STATE,
|
|
&device_power_state);
|
|
}
|
|
|
|
/**
|
|
* @brief Call the get power state function of a device
|
|
*
|
|
* This function lets the caller know the current device
|
|
* power state at any time. This state will be one of the defined
|
|
* power states allowed for the devices in that system
|
|
*
|
|
* @param device pointer to device structure of the driver instance.
|
|
* @param device_power_state Device power state to be filled by the device
|
|
*
|
|
* @retval 0 If successful.
|
|
* @retval Errno Negative errno code if failure.
|
|
*/
|
|
static inline int device_get_power_state(struct device *device,
|
|
u32_t *device_power_state)
|
|
{
|
|
return device->config->device_pm_control(device,
|
|
DEVICE_PM_GET_POWER_STATE,
|
|
device_power_state);
|
|
}
|
|
|
|
/**
|
|
* @brief Gets the device structure list array and device count
|
|
*
|
|
* Called by the Power Manager application to get the list of
|
|
* device structures associated with the devices in the system.
|
|
* The PM app would use this list to create its own sorted list
|
|
* based on the order it wishes to suspend or resume the devices.
|
|
*
|
|
* @param device_list Pointer to receive the device list array
|
|
* @param device_count Pointer to receive the device count
|
|
*/
|
|
void device_list_get(struct device **device_list, int *device_count);
|
|
|
|
/**
|
|
* @brief Check if any device is in the middle of a transaction
|
|
*
|
|
* Called by an application to see if any device is in the middle
|
|
* of a critical transaction that cannot be interrupted.
|
|
*
|
|
* @retval 0 if no device is busy
|
|
* @retval -EBUSY if any device is busy
|
|
*/
|
|
int device_any_busy_check(void);
|
|
|
|
/**
|
|
* @brief Check if a specific device is in the middle of a transaction
|
|
*
|
|
* Called by an application to see if a particular device is in the
|
|
* middle of a critical transaction that cannot be interrupted.
|
|
*
|
|
* @param chk_dev Pointer to device structure of the specific device driver
|
|
* the caller is interested in.
|
|
* @retval 0 if the device is not busy
|
|
* @retval -EBUSY if the device is busy
|
|
*/
|
|
int device_busy_check(struct device *chk_dev);
|
|
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
/**
|
|
* @}
|
|
*/
|
|
#endif /* ZEPHYR_INCLUDE_DEVICE_H_ */
|