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https://github.com/zephyrproject-rtos/zephyr
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e18fcbba5a
Now that device_api attribute is unmodified at runtime, as well as all the other attributes, it is possible to switch all device driver instance to be constant. A coccinelle rule is used for this: @r_const_dev_1 disable optional_qualifier @ @@ -struct device * +const struct device * @r_const_dev_2 disable optional_qualifier @ @@ -struct device * const +const struct device * Fixes #27399 Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/**
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* @file
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*
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* @brief Public APIs for the I2C emulation drivers.
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*/
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/*
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* Copyright 2020 Google LLC
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* Copyright (c) 2020 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_DRIVERS_I2C_I2C_EMUL_H_
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#define ZEPHYR_INCLUDE_DRIVERS_I2C_I2C_EMUL_H_
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/**
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* @brief I2C Emulation Interface
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* @defgroup i2c_emul_interface I2C Emulation Interface
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* @ingroup io_emulators
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* @{
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*/
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#include <zephyr/types.h>
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#include <device.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct i2c_msg;
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struct i2c_emul_api;
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/** Node in a linked list of emulators for I2C devices */
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struct i2c_emul {
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sys_snode_t node;
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/* API provided for this device */
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const struct i2c_emul_api *api;
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/* I2C address of the emulated device */
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uint16_t addr;
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};
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/**
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* Passes I2C messages to the emulator. The emulator updates the data with what
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* was read back.
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*
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* @param emul Emulator instance
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* @param msgs Array of messages to transfer. For 'read' messages, this function
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* updates the 'buf' member with the data that was read
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* @param num_msgs Number of messages to transfer.
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* @param addr Address of the I2C target device.
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*
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* @retval 0 If successful.
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* @retval -EIO General input / output error.
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*/
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typedef int (*i2c_emul_transfer_t)(struct i2c_emul *emul, struct i2c_msg *msgs,
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int num_msgs, int addr);
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/**
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* Register an emulated device on the controller
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*
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* @param dev Device that will use the emulator
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* @param name User-friendly name for this emulator
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* @param emul I2C emulator to use
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* @return 0 indicating success (always)
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*/
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int i2c_emul_register(const struct device *dev, const char *name,
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struct i2c_emul *emul);
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/** Definition of the emulator API */
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struct i2c_emul_api {
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i2c_emul_transfer_t transfer;
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};
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/**
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* Back door to allow an emulator to retrieve the host configuration.
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*
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* @param dev I2C device associated with the emulator
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* @return Bit-packed 32-bit value containing the device's runtime configuration
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*/
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uint32_t i2c_emul_get_config(const struct device *dev);
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#ifdef __cplusplus
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}
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#endif
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/**
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* @}
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*/
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#endif /* ZEPHYR_INCLUDE_DRIVERS_I2C_I2C_EMUL_H_ */
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