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d8187177 RC |
1 | /* |
2 | * Copyright (C) 2016 Red Hat | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
20 | * OTHER DEALINGS IN THE SOFTWARE. | |
21 | * | |
22 | * Authors: | |
23 | * Rob Clark <robdclark@gmail.com> | |
24 | */ | |
25 | ||
26 | #ifndef DRM_PRINT_H_ | |
27 | #define DRM_PRINT_H_ | |
28 | ||
29 | #include <linux/seq_file.h> | |
30 | #include <linux/device.h> | |
31 | ||
32 | /** | |
33 | * DOC: print | |
34 | * | |
35 | * A simple wrapper for dev_printk(), seq_printf(), etc. Allows same | |
36 | * debug code to be used for both debugfs and printk logging. | |
37 | * | |
38 | * For example:: | |
39 | * | |
40 | * void log_some_info(struct drm_printer *p) | |
41 | * { | |
42 | * drm_printf(p, "foo=%d\n", foo); | |
43 | * drm_printf(p, "bar=%d\n", bar); | |
44 | * } | |
45 | * | |
46 | * #ifdef CONFIG_DEBUG_FS | |
47 | * void debugfs_show(struct seq_file *f) | |
48 | * { | |
49 | * struct drm_printer p = drm_seq_file_printer(f); | |
50 | * log_some_info(&p); | |
51 | * } | |
52 | * #endif | |
53 | * | |
54 | * void some_other_function(...) | |
55 | * { | |
56 | * struct drm_printer p = drm_info_printer(drm->dev); | |
57 | * log_some_info(&p); | |
58 | * } | |
59 | */ | |
60 | ||
61 | /** | |
62 | * struct drm_printer - drm output "stream" | |
63 | * @printfn: actual output fxn | |
64 | * @arg: output fxn specific data | |
65 | * | |
66 | * Do not use struct members directly. Use drm_printer_seq_file(), | |
67 | * drm_printer_info(), etc to initialize. And drm_printf() for output. | |
68 | */ | |
69 | struct drm_printer { | |
70 | void (*printfn)(struct drm_printer *p, struct va_format *vaf); | |
71 | void *arg; | |
72 | }; | |
73 | ||
74 | void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf); | |
75 | void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf); | |
76 | ||
77 | /** | |
78 | * drm_printf - print to a &drm_printer stream | |
79 | * @p: the &drm_printer | |
80 | * @f: format string | |
81 | */ | |
82 | void drm_printf(struct drm_printer *p, const char *f, ...); | |
83 | ||
84 | ||
85 | /** | |
86 | * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file | |
87 | * @f: the struct &seq_file to output to | |
88 | * | |
89 | * RETURNS: | |
90 | * The &drm_printer object | |
91 | */ | |
92 | static inline struct drm_printer drm_seq_file_printer(struct seq_file *f) | |
93 | { | |
94 | struct drm_printer p = { | |
95 | .printfn = __drm_printfn_seq_file, | |
96 | .arg = f, | |
97 | }; | |
98 | return p; | |
99 | } | |
100 | ||
101 | /** | |
102 | * drm_info_printer - construct a &drm_printer that outputs to dev_printk() | |
103 | * @dev: the struct &device pointer | |
104 | * | |
105 | * RETURNS: | |
106 | * The &drm_printer object | |
107 | */ | |
108 | static inline struct drm_printer drm_info_printer(struct device *dev) | |
109 | { | |
110 | struct drm_printer p = { | |
111 | .printfn = __drm_printfn_info, | |
112 | .arg = dev, | |
113 | }; | |
114 | return p; | |
115 | } | |
116 | ||
117 | #endif /* DRM_PRINT_H_ */ |