281 lines
6.9 KiB
C
281 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2018 Cadence Design Systems Inc.
|
|
*
|
|
* Author: Boris Brezillon <boris.brezillon@bootlin.com>
|
|
*/
|
|
|
|
#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.
|
|
*/
|
|
int i3c_device_do_priv_xfers(struct i3c_device *dev,
|
|
struct i3c_priv_xfer *xfers,
|
|
int nxfers)
|
|
{
|
|
int ret, i;
|
|
|
|
if (nxfers < 1)
|
|
return 0;
|
|
|
|
for (i = 0; i < nxfers; i++) {
|
|
if (!xfers[i].len || !xfers[i].data.in)
|
|
return -EINVAL;
|
|
}
|
|
|
|
i3c_bus_normaluse_lock(dev->bus);
|
|
ret = i3c_dev_do_priv_xfers_locked(dev->desc, xfers, nxfers);
|
|
i3c_bus_normaluse_unlock(dev->bus);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_device_do_priv_xfers);
|
|
|
|
/**
|
|
* 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(struct i3c_device *dev,
|
|
struct i3c_device_info *info)
|
|
{
|
|
if (!info)
|
|
return;
|
|
|
|
i3c_bus_normaluse_lock(dev->bus);
|
|
if (dev->desc)
|
|
*info = dev->desc->info;
|
|
i3c_bus_normaluse_unlock(dev->bus);
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_device_get_info);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret = -ENOENT;
|
|
|
|
i3c_bus_normaluse_lock(dev->bus);
|
|
if (dev->desc) {
|
|
mutex_lock(&dev->desc->ibi_lock);
|
|
ret = i3c_dev_disable_ibi_locked(dev->desc);
|
|
mutex_unlock(&dev->desc->ibi_lock);
|
|
}
|
|
i3c_bus_normaluse_unlock(dev->bus);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_device_disable_ibi);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret = -ENOENT;
|
|
|
|
i3c_bus_normaluse_lock(dev->bus);
|
|
if (dev->desc) {
|
|
mutex_lock(&dev->desc->ibi_lock);
|
|
ret = i3c_dev_enable_ibi_locked(dev->desc);
|
|
mutex_unlock(&dev->desc->ibi_lock);
|
|
}
|
|
i3c_bus_normaluse_unlock(dev->bus);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_device_enable_ibi);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret = -ENOENT;
|
|
|
|
if (!req->handler || !req->num_slots)
|
|
return -EINVAL;
|
|
|
|
i3c_bus_normaluse_lock(dev->bus);
|
|
if (dev->desc) {
|
|
mutex_lock(&dev->desc->ibi_lock);
|
|
ret = i3c_dev_request_ibi_locked(dev->desc, req);
|
|
mutex_unlock(&dev->desc->ibi_lock);
|
|
}
|
|
i3c_bus_normaluse_unlock(dev->bus);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_device_request_ibi);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
i3c_bus_normaluse_lock(dev->bus);
|
|
if (dev->desc) {
|
|
mutex_lock(&dev->desc->ibi_lock);
|
|
i3c_dev_free_ibi_locked(dev->desc);
|
|
mutex_unlock(&dev->desc->ibi_lock);
|
|
}
|
|
i3c_bus_normaluse_unlock(dev->bus);
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_device_free_ibi);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return &i3cdev->dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3cdev_to_dev);
|
|
|
|
/**
|
|
* dev_to_i3cdev() - Returns the I3C device containing @dev
|
|
* @dev: device object
|
|
*
|
|
* Return: a pointer to an I3C device object.
|
|
*/
|
|
struct i3c_device *dev_to_i3cdev(struct device *dev)
|
|
{
|
|
return container_of(dev, struct i3c_device, dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_to_i3cdev);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct i3c_device_info devinfo;
|
|
const struct i3c_device_id *id;
|
|
u16 manuf, part, ext_info;
|
|
bool rndpid;
|
|
|
|
i3c_device_get_info(i3cdev, &devinfo);
|
|
|
|
manuf = I3C_PID_MANUF_ID(devinfo.pid);
|
|
part = I3C_PID_PART_ID(devinfo.pid);
|
|
ext_info = I3C_PID_EXTRA_INFO(devinfo.pid);
|
|
rndpid = I3C_PID_RND_LOWER_32BITS(devinfo.pid);
|
|
|
|
for (id = id_table; id->match_flags != 0; id++) {
|
|
if ((id->match_flags & I3C_MATCH_DCR) &&
|
|
id->dcr != devinfo.dcr)
|
|
continue;
|
|
|
|
if ((id->match_flags & I3C_MATCH_MANUF) &&
|
|
id->manuf_id != manuf)
|
|
continue;
|
|
|
|
if ((id->match_flags & I3C_MATCH_PART) &&
|
|
(rndpid || id->part_id != part))
|
|
continue;
|
|
|
|
if ((id->match_flags & I3C_MATCH_EXTRA_INFO) &&
|
|
(rndpid || id->extra_info != ext_info))
|
|
continue;
|
|
|
|
return id;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_device_match_id);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
drv->driver.owner = owner;
|
|
drv->driver.bus = &i3c_bus_type;
|
|
|
|
return driver_register(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_driver_register_with_owner);
|
|
|
|
/**
|
|
* i3c_driver_unregister() - unregister an I3C device driver
|
|
*
|
|
* @drv: driver to unregister
|
|
*
|
|
* Unregister @drv.
|
|
*/
|
|
void i3c_driver_unregister(struct i3c_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(i3c_driver_unregister);
|