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2025cf9e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3703f53b SP |
2 | /* |
3 | * Initialization protocol for ISHTP driver | |
4 | * | |
5 | * Copyright (c) 2003-2016, Intel Corporation. | |
3703f53b SP |
6 | */ |
7 | ||
8 | #include <linux/export.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/sched.h> | |
3703f53b SP |
11 | #include "ishtp-dev.h" |
12 | #include "hbm.h" | |
13 | #include "client.h" | |
14 | ||
15 | /** | |
16 | * ishtp_dev_state_str() -Convert to string format | |
17 | * @state: state to convert | |
18 | * | |
19 | * Convert state to string for prints | |
20 | * | |
21 | * Return: character pointer to converted string | |
22 | */ | |
23 | const char *ishtp_dev_state_str(int state) | |
24 | { | |
25 | switch (state) { | |
26 | case ISHTP_DEV_INITIALIZING: | |
27 | return "INITIALIZING"; | |
28 | case ISHTP_DEV_INIT_CLIENTS: | |
29 | return "INIT_CLIENTS"; | |
30 | case ISHTP_DEV_ENABLED: | |
31 | return "ENABLED"; | |
32 | case ISHTP_DEV_RESETTING: | |
33 | return "RESETTING"; | |
34 | case ISHTP_DEV_DISABLED: | |
35 | return "DISABLED"; | |
36 | case ISHTP_DEV_POWER_DOWN: | |
37 | return "POWER_DOWN"; | |
38 | case ISHTP_DEV_POWER_UP: | |
39 | return "POWER_UP"; | |
40 | default: | |
41 | return "unknown"; | |
42 | } | |
43 | } | |
44 | ||
45 | /** | |
46 | * ishtp_device_init() - ishtp device init | |
47 | * @dev: ISHTP device instance | |
48 | * | |
49 | * After ISHTP device is alloacted, this function is used to initialize | |
50 | * each field which includes spin lock, work struct and lists | |
51 | */ | |
52 | void ishtp_device_init(struct ishtp_device *dev) | |
53 | { | |
54 | dev->dev_state = ISHTP_DEV_INITIALIZING; | |
55 | INIT_LIST_HEAD(&dev->cl_list); | |
56 | INIT_LIST_HEAD(&dev->device_list); | |
57 | dev->rd_msg_fifo_head = 0; | |
58 | dev->rd_msg_fifo_tail = 0; | |
59 | spin_lock_init(&dev->rd_msg_spinlock); | |
60 | ||
61 | init_waitqueue_head(&dev->wait_hbm_recvd_msg); | |
62 | spin_lock_init(&dev->read_list_spinlock); | |
63 | spin_lock_init(&dev->device_lock); | |
64 | spin_lock_init(&dev->device_list_lock); | |
65 | spin_lock_init(&dev->cl_list_lock); | |
66 | spin_lock_init(&dev->fw_clients_lock); | |
67 | INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn); | |
68 | ||
69 | bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX); | |
70 | dev->open_handle_count = 0; | |
71 | ||
72 | /* | |
73 | * Reserving client ID 0 for ISHTP Bus Message communications | |
74 | */ | |
75 | bitmap_set(dev->host_clients_map, 0, 1); | |
76 | ||
77 | INIT_LIST_HEAD(&dev->read_list.list); | |
78 | ||
79 | } | |
80 | EXPORT_SYMBOL(ishtp_device_init); | |
81 | ||
82 | /** | |
83 | * ishtp_start() - Start ISH processing | |
84 | * @dev: ISHTP device instance | |
85 | * | |
86 | * Start ISHTP processing by sending query subscriber message | |
87 | * | |
88 | * Return: 0 on success else -ENODEV | |
89 | */ | |
90 | int ishtp_start(struct ishtp_device *dev) | |
91 | { | |
92 | if (ishtp_hbm_start_wait(dev)) { | |
93 | dev_err(dev->devc, "HBM haven't started"); | |
94 | goto err; | |
95 | } | |
96 | ||
97 | /* suspend & resume notification - send QUERY_SUBSCRIBERS msg */ | |
98 | ishtp_query_subscribers(dev); | |
99 | ||
100 | return 0; | |
101 | err: | |
102 | dev_err(dev->devc, "link layer initialization failed.\n"); | |
103 | dev->dev_state = ISHTP_DEV_DISABLED; | |
104 | return -ENODEV; | |
105 | } | |
106 | EXPORT_SYMBOL(ishtp_start); |