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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * A dummy STM device for stm/stm_source class testing.
4 * Copyright (c) 2014, Intel Corporation.
5 *
6 * STM class implements generic infrastructure for System Trace Module devices
7 * as defined in MIPI STPv2 specification.
8 */
9
10#undef DEBUG
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/stm.h>
15#include <uapi/linux/stm.h>
16
17static ssize_t notrace
18dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
19 unsigned int channel, unsigned int packet, unsigned int flags,
20 unsigned int size, const unsigned char *payload)
21{
22#ifdef DEBUG
23 u64 pl = 0;
24
25 if (payload)
26 pl = *(u64 *)payload;
27
28 if (size < 8)
29 pl &= (1ull << (size * 8)) - 1;
30 trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel,
31 packet, size, pl);
32#endif
33 return size;
34}
35
36#define DUMMY_STM_MAX 32
37
38static struct stm_data dummy_stm[DUMMY_STM_MAX];
39
40static int nr_dummies = 4;
41
42module_param(nr_dummies, int, 0400);
43
44static unsigned int fail_mode;
45
46module_param(fail_mode, int, 0600);
47
48static unsigned int master_min;
49
50module_param(master_min, int, 0400);
51
52static unsigned int master_max = STP_MASTER_MAX;
53
54module_param(master_max, int, 0400);
55
56static unsigned int nr_channels = STP_CHANNEL_MAX;
57
58module_param(nr_channels, int, 0400);
59
60static int dummy_stm_link(struct stm_data *data, unsigned int master,
61 unsigned int channel)
62{
63 if (fail_mode && (channel & fail_mode))
64 return -EINVAL;
65
66 return 0;
67}
68
69static int dummy_stm_init(void)
70{
71 int i, ret = -ENOMEM;
72
73 if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX)
74 return -EINVAL;
75
76 if (master_min > master_max ||
77 master_max > STP_MASTER_MAX ||
78 nr_channels > STP_CHANNEL_MAX)
79 return -EINVAL;
80
81 for (i = 0; i < nr_dummies; i++) {
82 dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
83 if (!dummy_stm[i].name)
84 goto fail_unregister;
85
86 dummy_stm[i].sw_start = master_min;
87 dummy_stm[i].sw_end = master_max;
88 dummy_stm[i].sw_nchannels = nr_channels;
89 dummy_stm[i].packet = dummy_stm_packet;
90 dummy_stm[i].link = dummy_stm_link;
91
92 ret = stm_register_device(NULL, &dummy_stm[i], THIS_MODULE);
93 if (ret)
94 goto fail_free;
95 }
96
97 return 0;
98
99fail_unregister:
100 for (i--; i >= 0; i--) {
101 stm_unregister_device(&dummy_stm[i]);
102fail_free:
103 kfree(dummy_stm[i].name);
104 }
105
106 return ret;
107
108}
109
110static void dummy_stm_exit(void)
111{
112 int i;
113
114 for (i = 0; i < nr_dummies; i++) {
115 stm_unregister_device(&dummy_stm[i]);
116 kfree(dummy_stm[i].name);
117 }
118}
119
120module_init(dummy_stm_init);
121module_exit(dummy_stm_exit);
122
123MODULE_LICENSE("GPL v2");
124MODULE_DESCRIPTION("dummy_stm device");
125MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
1/*
2 * A dummy STM device for stm/stm_source class testing.
3 * Copyright (c) 2014, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * STM class implements generic infrastructure for System Trace Module devices
15 * as defined in MIPI STPv2 specification.
16 */
17
18#undef DEBUG
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/stm.h>
23
24static ssize_t notrace
25dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
26 unsigned int channel, unsigned int packet, unsigned int flags,
27 unsigned int size, const unsigned char *payload)
28{
29#ifdef DEBUG
30 u64 pl = 0;
31
32 if (payload)
33 pl = *(u64 *)payload;
34
35 if (size < 8)
36 pl &= (1ull << (size * 8)) - 1;
37 trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel,
38 packet, size, pl);
39#endif
40 return size;
41}
42
43#define DUMMY_STM_MAX 32
44
45static struct stm_data dummy_stm[DUMMY_STM_MAX];
46
47static int nr_dummies = 4;
48
49module_param(nr_dummies, int, 0400);
50
51static unsigned int fail_mode;
52
53module_param(fail_mode, int, 0600);
54
55static int dummy_stm_link(struct stm_data *data, unsigned int master,
56 unsigned int channel)
57{
58 if (fail_mode && (channel & fail_mode))
59 return -EINVAL;
60
61 return 0;
62}
63
64static int dummy_stm_init(void)
65{
66 int i, ret = -ENOMEM;
67
68 if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX)
69 return -EINVAL;
70
71 for (i = 0; i < nr_dummies; i++) {
72 dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
73 if (!dummy_stm[i].name)
74 goto fail_unregister;
75
76 dummy_stm[i].sw_start = 0x0000;
77 dummy_stm[i].sw_end = 0xffff;
78 dummy_stm[i].sw_nchannels = 0xffff;
79 dummy_stm[i].packet = dummy_stm_packet;
80 dummy_stm[i].link = dummy_stm_link;
81
82 ret = stm_register_device(NULL, &dummy_stm[i], THIS_MODULE);
83 if (ret)
84 goto fail_free;
85 }
86
87 return 0;
88
89fail_unregister:
90 for (i--; i >= 0; i--) {
91 stm_unregister_device(&dummy_stm[i]);
92fail_free:
93 kfree(dummy_stm[i].name);
94 }
95
96 return ret;
97
98}
99
100static void dummy_stm_exit(void)
101{
102 int i;
103
104 for (i = 0; i < nr_dummies; i++) {
105 stm_unregister_device(&dummy_stm[i]);
106 kfree(dummy_stm[i].name);
107 }
108}
109
110module_init(dummy_stm_init);
111module_exit(dummy_stm_exit);
112
113MODULE_LICENSE("GPL v2");
114MODULE_DESCRIPTION("dummy_stm device");
115MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");