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 void drm_printf(struct drm_printer *p, const char *f, ...); 78 79 80 /** 81 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file 82 * @f: the struct &seq_file to output to 83 * 84 * RETURNS: 85 * The &drm_printer object 86 */ 87 static inline struct drm_printer drm_seq_file_printer(struct seq_file *f) 88 { 89 struct drm_printer p = { 90 .printfn = __drm_printfn_seq_file, 91 .arg = f, 92 }; 93 return p; 94 } 95 96 /** 97 * drm_info_printer - construct a &drm_printer that outputs to dev_printk() 98 * @dev: the struct &device pointer 99 * 100 * RETURNS: 101 * The &drm_printer object 102 */ 103 static inline struct drm_printer drm_info_printer(struct device *dev) 104 { 105 struct drm_printer p = { 106 .printfn = __drm_printfn_info, 107 .arg = dev, 108 }; 109 return p; 110 } 111 112 #endif /* DRM_PRINT_H_ */ 113