path: root/drivers/hid/intel-ish-hid/ishtp/client.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ISHTP client logic
 *
 * Copyright (c) 2003-2016, Intel Corporation.
 */

#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <asm/cacheflush.h>
#include "hbm.h"
#include "client.h"

int ishtp_cl_get_tx_free_buffer_size(struct ishtp_cl *cl)
{
	unsigned long tx_free_flags;
	int size;

	spin_lock_irqsave(&cl->tx_free_list_spinlock, tx_free_flags);
	size = cl->tx_ring_free_size * cl->device->fw_client->props.max_msg_length;
	spin_unlock_irqrestore(&cl->tx_free_list_spinlock, tx_free_flags);

	return size;
}
EXPORT_SYMBOL(ishtp_cl_get_tx_free_buffer_size);

int ishtp_cl_get_tx_free_rings(struct ishtp_cl *cl)
{
	return cl->tx_ring_free_size;
}
EXPORT_SYMBOL(ishtp_cl_get_tx_free_rings);

/**
 * ishtp_read_list_flush() - Flush read queue
 * @cl: ishtp client instance
 *
 * Used to remove all entries from read queue for a client
 */
static void ishtp_read_list_flush(struct ishtp_cl *cl)
{
	struct ishtp_cl_rb *rb;
	struct ishtp_cl_rb *next;
	unsigned long	flags;

	spin_lock_irqsave(&cl->dev->read_list_spinlock, flags);
	list_for_each_entry_safe(rb, next, &cl->dev->read_list.list, list)
		if (rb->cl && ishtp_cl_cmp_id(cl, rb->cl)) {
			list_del(&rb->list);
			spin_lock(&cl->free_list_spinlock);
			list_add_tail(&rb->list, &cl->free_rb_list.list);
			spin_unlock(&cl->free_list_spinlock);
		}
	spin_unlock_irqrestore(&cl->dev->read_list_spinlock, flags);
}

/**
 * ishtp_cl_flush_queues() - Flush all queues for a client
 * @cl: ishtp client instance
 *
 * Used to remove all queues for a client. This is called when a client device
 * needs reset due to error, S3 resume or during module removal
 *
 * Return: 0 on success else -EINVAL if device is NULL
 */
int ishtp_cl_flush_queues(struct ishtp_cl *cl)
{
	if (WARN_ON(!cl || !cl->dev))
		return -EINVAL;

	ishtp_read_list_flush(cl);

	return 0;
}
EXPORT_SYMBOL(ishtp_cl_flush_queues);

/**
 * ishtp_cl_init() - Initialize all fields of a client device
 * @cl: ishtp client instance
 * @dev: ishtp device
 *
 * Initializes a client device fields: Init spinlocks, init queues etc.
 * This function is called during new client creation
 */
static void ishtp_cl_init(struct ishtp_cl *cl, struct ishtp_device *dev)
{
	memset(cl, 0, sizeof(struct ishtp_cl));
	init_waitqueue_head(&cl->wait_ctrl_res);
	spin_lock_init(&cl->free_list_spinlock);
	spin_lock_init(&cl->in_process_spinlock);
	spin_lock_init(&cl->tx_list_spinlock);
	spin_lock_init(&cl->tx_free_list_spinlock);
	spin_lock_init(&cl->fc_spinlock);
	INIT_LIST_HEAD(&cl->link);
	cl->dev = dev;

	INIT_LIST_HEAD(&cl->free_rb_list.list);
	INIT_LIST_HEAD(&cl->tx_list.list);
	INIT_LIST_HEAD(&cl->tx_free_list.list);
	INIT_LIST_HEAD(&cl->in_process_list.list);

	cl->rx_ring_size = CL_DEF_RX_RING_SIZE;
	cl<