init.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Initialization protocol for ISHTP driver
 4 *
 5 * Copyright (c) 2003-2016, Intel Corporation.
 6 */
 7
 8#include <linux/devm-helpers.h>
 9#include <linux/export.h>
10#include <linux/slab.h>
11#include <linux/sched.h>
12#include "ishtp-dev.h"
13#include "hbm.h"
14#include "client.h"
15#include "loader.h"
16
17/**
18 * ishtp_device_init() - ishtp device init
19 * @dev: ISHTP device instance
20 *
21 * After ISHTP device is alloacted, this function is used to initialize
22 * each field which includes spin lock, work struct and lists
23 */
24void ishtp_device_init(struct ishtp_device *dev)
25{
26	int ret;
27
28	dev->dev_state = ISHTP_DEV_INITIALIZING;
29	INIT_LIST_HEAD(&dev->cl_list);
30	INIT_LIST_HEAD(&dev->device_list);
31	dev->rd_msg_fifo_head = 0;
32	dev->rd_msg_fifo_tail = 0;
33	spin_lock_init(&dev->rd_msg_spinlock);
34
35	init_waitqueue_head(&dev->wait_hbm_recvd_msg);
36	init_waitqueue_head(&dev->wait_loader_recvd_msg);
37	spin_lock_init(&dev->read_list_spinlock);
38	spin_lock_init(&dev->device_lock);
39	spin_lock_init(&dev->device_list_lock);
40	spin_lock_init(&dev->cl_list_lock);
41	spin_lock_init(&dev->fw_clients_lock);
42	INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn);
43
44	bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX);
45	dev->open_handle_count = 0;
46
47	/*
48	 * Reserving client ID 0 for ISHTP Bus Message communications
49	 */
50	bitmap_set(dev->host_clients_map, 0, 1);
51
52	INIT_LIST_HEAD(&dev->read_list.list);
53
54	ret = devm_work_autocancel(dev->devc, &dev->work_fw_loader, ishtp_loader_work);
55	if (ret)
56		dev_err_probe(dev->devc, ret, "Failed to initialise FW loader work\n");
57}
58EXPORT_SYMBOL(ishtp_device_init);
59
60/**
61 * ishtp_start() - Start ISH processing
62 * @dev: ISHTP device instance
63 *
64 * Start ISHTP processing by sending query subscriber message
65 *
66 * Return: 0 on success else -ENODEV
67 */
68int ishtp_start(struct ishtp_device *dev)
69{
70	if (ishtp_hbm_start_wait(dev)) {
71		dev_err(dev->devc, "HBM haven't started");
72		goto err;
73	}
74
75	/* suspend & resume notification - send QUERY_SUBSCRIBERS msg */
76	ishtp_query_subscribers(dev);
77
78	return 0;
79err:
80	dev_err(dev->devc, "link layer initialization failed.\n");
81	dev->dev_state = ISHTP_DEV_DISABLED;
82	return -ENODEV;
83}
84EXPORT_SYMBOL(ishtp_start);