linux/drivers/i3c/device.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Cadence Design Systems Inc.
 *
 * Author: Boris Brezillon <[email protected]>
 */

#include <linux/atomic.h>
#include <linux/bug.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/slab.h>

#include "internals.h"

/**
 * i3c_device_do_priv_xfers() - do I3C SDR private transfers directed to a
 *				specific device
 *
 * @dev: device with which the transfers should be done
 * @xfers: array of transfers
 * @nxfers: number of transfers
 *
 * Initiate one or several private SDR transfers with @dev.
 *
 * This function can sleep and thus cannot be called in atomic context.
 *
 * Return: 0 in case of success, a negative error core otherwise.
 *	   -EAGAIN: controller lost address arbitration. Target
 *		    (IBI, HJ or controller role request) win the bus. Client
 *		    driver needs to resend the 'xfers' some time later.
 *		    See I3C spec ver 1.1.1 09-Jun-2021. Section: 5.1.2.2.3.
 */
int i3c_device_do_priv_xfers(struct i3c_device *dev,
			     struct i3c_priv_xfer *xfers,
			     int nxfers)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_device_do_setdasa() - do I3C dynamic address assignement with
 *                           static address
 *
 * @dev: device with which the DAA should be done
 *
 * Return: 0 in case of success, a negative error core otherwise.
 */
int i3c_device_do_setdasa(struct i3c_device *dev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_device_get_info() - get I3C device information
 *
 * @dev: device we want information on
 * @info: the information object to fill in
 *
 * Retrieve I3C dev info.
 */
void i3c_device_get_info(const struct i3c_device *dev,
			 struct i3c_device_info *info)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_device_disable_ibi() - Disable IBIs coming from a specific device
 * @dev: device on which IBIs should be disabled
 *
 * This function disable IBIs coming from a specific device and wait for
 * all pending IBIs to be processed.
 *
 * Return: 0 in case of success, a negative error core otherwise.
 */
int i3c_device_disable_ibi(struct i3c_device *dev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_device_enable_ibi() - Enable IBIs coming from a specific device
 * @dev: device on which IBIs should be enabled
 *
 * This function enable IBIs coming from a specific device and wait for
 * all pending IBIs to be processed. This should be called on a device
 * where i3c_device_request_ibi() has succeeded.
 *
 * Note that IBIs from this device might be received before this function
 * returns to its caller.
 *
 * Return: 0 in case of success, a negative error core otherwise.
 */
int i3c_device_enable_ibi(struct i3c_device *dev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_device_request_ibi() - Request an IBI
 * @dev: device for which we should enable IBIs
 * @req: setup requested for this IBI
 *
 * This function is responsible for pre-allocating all resources needed to
 * process IBIs coming from @dev. When this function returns, the IBI is not
 * enabled until i3c_device_enable_ibi() is called.
 *
 * Return: 0 in case of success, a negative error core otherwise.
 */
int i3c_device_request_ibi(struct i3c_device *dev,
			   const struct i3c_ibi_setup *req)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_device_free_ibi() - Free all resources needed for IBI handling
 * @dev: device on which you want to release IBI resources
 *
 * This function is responsible for de-allocating resources previously
 * allocated by i3c_device_request_ibi(). It should be called after disabling
 * IBIs with i3c_device_disable_ibi().
 */
void i3c_device_free_ibi(struct i3c_device *dev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3cdev_to_dev() - Returns the device embedded in @i3cdev
 * @i3cdev: I3C device
 *
 * Return: a pointer to a device object.
 */
struct device *i3cdev_to_dev(struct i3c_device *i3cdev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_device_match_id() - Returns the i3c_device_id entry matching @i3cdev
 * @i3cdev: I3C device
 * @id_table: I3C device match table
 *
 * Return: a pointer to an i3c_device_id object or NULL if there's no match.
 */
const struct i3c_device_id *
i3c_device_match_id(struct i3c_device *i3cdev,
		    const struct i3c_device_id *id_table)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_driver_register_with_owner() - register an I3C device driver
 *
 * @drv: driver to register
 * @owner: module that owns this driver
 *
 * Register @drv to the core.
 *
 * Return: 0 in case of success, a negative error core otherwise.
 */
int i3c_driver_register_with_owner(struct i3c_driver *drv, struct module *owner)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * i3c_driver_unregister() - unregister an I3C device driver
 *
 * @drv: driver to unregister
 *
 * Unregister @drv.
 */
void i3c_driver_unregister(struct i3c_driver *drv)
{ … }
EXPORT_SYMBOL_GPL(…);