1 /*
2 * Initialization protocol for ISHTP driver
3 *
4 * Copyright (c) 2003-2016, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16 #include <linux/export.h>
17 #include <linux/slab.h>
18 #include <linux/sched.h>
19 #include "ishtp-dev.h"
20 #include "hbm.h"
21 #include "client.h"
22
23 /**
24 * ishtp_dev_state_str() -Convert to string format
25 * @state: state to convert
26 *
27 * Convert state to string for prints
28 *
29 * Return: character pointer to converted string
30 */
ishtp_dev_state_str(int state)31 const char *ishtp_dev_state_str(int state)
32 {
33 switch (state) {
34 case ISHTP_DEV_INITIALIZING:
35 return "INITIALIZING";
36 case ISHTP_DEV_INIT_CLIENTS:
37 return "INIT_CLIENTS";
38 case ISHTP_DEV_ENABLED:
39 return "ENABLED";
40 case ISHTP_DEV_RESETTING:
41 return "RESETTING";
42 case ISHTP_DEV_DISABLED:
43 return "DISABLED";
44 case ISHTP_DEV_POWER_DOWN:
45 return "POWER_DOWN";
46 case ISHTP_DEV_POWER_UP:
47 return "POWER_UP";
48 default:
49 return "unknown";
50 }
51 }
52
53 /**
54 * ishtp_device_init() - ishtp device init
55 * @dev: ISHTP device instance
56 *
57 * After ISHTP device is alloacted, this function is used to initialize
58 * each field which includes spin lock, work struct and lists
59 */
ishtp_device_init(struct ishtp_device * dev)60 void ishtp_device_init(struct ishtp_device *dev)
61 {
62 dev->dev_state = ISHTP_DEV_INITIALIZING;
63 INIT_LIST_HEAD(&dev->cl_list);
64 INIT_LIST_HEAD(&dev->device_list);
65 dev->rd_msg_fifo_head = 0;
66 dev->rd_msg_fifo_tail = 0;
67 spin_lock_init(&dev->rd_msg_spinlock);
68
69 init_waitqueue_head(&dev->wait_hbm_recvd_msg);
70 spin_lock_init(&dev->read_list_spinlock);
71 spin_lock_init(&dev->device_lock);
72 spin_lock_init(&dev->device_list_lock);
73 spin_lock_init(&dev->cl_list_lock);
74 spin_lock_init(&dev->fw_clients_lock);
75 INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn);
76
77 bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX);
78 dev->open_handle_count = 0;
79
80 /*
81 * Reserving client ID 0 for ISHTP Bus Message communications
82 */
83 bitmap_set(dev->host_clients_map, 0, 1);
84
85 INIT_LIST_HEAD(&dev->read_list.list);
86
87 }
88 EXPORT_SYMBOL(ishtp_device_init);
89
90 /**
91 * ishtp_start() - Start ISH processing
92 * @dev: ISHTP device instance
93 *
94 * Start ISHTP processing by sending query subscriber message
95 *
96 * Return: 0 on success else -ENODEV
97 */
ishtp_start(struct ishtp_device * dev)98 int ishtp_start(struct ishtp_device *dev)
99 {
100 if (ishtp_hbm_start_wait(dev)) {
101 dev_err(dev->devc, "HBM haven't started");
102 goto err;
103 }
104
105 /* suspend & resume notification - send QUERY_SUBSCRIBERS msg */
106 ishtp_query_subscribers(dev);
107
108 return 0;
109 err:
110 dev_err(dev->devc, "link layer initialization failed.\n");
111 dev->dev_state = ISHTP_DEV_DISABLED;
112 return -ENODEV;
113 }
114 EXPORT_SYMBOL(ishtp_start);
115