[linux-2.6-block.git] / include / drm / drm_print.h

/*
 * Copyright (C) 2016 Red Hat
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 * Rob Clark <robdclark@gmail.com>
 */

#ifndef DRM_PRINT_H_
#define DRM_PRINT_H_

#include <linux/seq_file.h>
#include <linux/device.h>

/**
 * DOC: print
 *
 * A simple wrapper for dev_printk(), seq_printf(), etc.  Allows same
 * debug code to be used for both debugfs and printk logging.
 *
 * For example::
 *
 *     void log_some_info(struct drm_printer *p)
 *     {
 *             drm_printf(p, "foo=%d\n", foo);
 *             drm_printf(p, "bar=%d\n", bar);
 *     }
 *
 *     #ifdef CONFIG_DEBUG_FS
 *     void debugfs_show(struct seq_file *f)
 *     {
 *             struct drm_printer p = drm_seq_file_printer(f);
 *             log_some_info(&p);
 *     }
 *     #endif
 *
 *     void some_other_function(...)
 *     {
 *             struct drm_printer p = drm_info_printer(drm->dev);
 *             log_some_info(&p);
 *     }
 */

/**
 * struct drm_printer - drm output "stream"
 * @printfn: actual output fxn
 * @arg: output fxn specific data
 *
 * Do not use struct members directly.  Use drm_printer_seq_file(),
 * drm_printer_info(), etc to initialize.  And drm_printf() for output.
 */
struct drm_printer {
	void (*printfn)(struct drm_printer *p, struct va_format *vaf);
	void *arg;
};

void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);

void drm_printf(struct drm_printer *p, const char *f, ...);


/**
 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
 * @f:  the struct &seq_file to output to
 *
 * RETURNS:
 * The &drm_printer object
 */
static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
{
	struct drm_printer p = {
		.printfn = __drm_printfn_seq_file,
		.arg = f,
	};
	return p;
}

/**
 * drm_info_printer - construct a &drm_printer that outputs to dev_printk()
 * @dev: the struct &device pointer
 *
 * RETURNS:
 * The &drm_printer object
 */
static inline struct drm_printer drm_info_printer(struct device *dev)
{
	struct drm_printer p = {
		.printfn = __drm_printfn_info,
		.arg = dev,
	};
	return p;
}

#endif /* DRM_PRINT_H_ */
Commit	Line	Data
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
d8187177 RC	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_ */