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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
* Copyright (c) 2013 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
* Marek Vasut <marex@denx.de>
*/
#ifndef _DM_DEVICE_COMPAT_H
#define _DM_DEVICE_COMPAT_H
#include <log.h>
#include <linux/build_bug.h>
#include <linux/compat.h>
#include <linux/printk.h>
/*
* Define a new identifier which can be tested on by C code. A similar
* definition is made for DEBUG in <log.h>.
*/
#ifdef VERBOSE_DEBUG
#define _VERBOSE_DEBUG 1
#else
#define _VERBOSE_DEBUG 0
#endif
/**
* dev_printk_emit() - Emit a formatted log message
* @cat: Category of the message
* @level: Log level of the message
* @fmt: Format string
* @...: Arguments for @fmt
*
* This macro logs a message through the appropriate channel. It is a macro so
* the if statements can be optimized out (as @level should be a constant known
* at compile-time).
*
* If DEBUG or VERBOSE_DEBUG is defined, then some messages are always printed
* (through printf()). This is to match the historical behavior of the dev_xxx
* functions.
*
* If LOG is enabled, use log() to emit the message, otherwise print it based on
* the console loglevel.
*/
#define dev_printk_emit(cat, level, fmt, ...) \
({ \
if ((_DEBUG && level == LOGL_DEBUG) || \
(_VERBOSE_DEBUG && level == LOGL_DEBUG_CONTENT)) \
printf(fmt, ##__VA_ARGS__); \
else if (CONFIG_IS_ENABLED(LOG)) \
log(cat, level, fmt, ##__VA_ARGS__); \
else if (level < CONFIG_VAL(LOGLEVEL)) \
printf(fmt, ##__VA_ARGS__); \
})
/**
* __dev_printk() - Log a message for a device
* @level: Log level of the message
* @dev: A &struct udevice or &struct device
* @fmt: Format string
* @...: Arguments for @fmt
*
* This macro formats and prints dev_xxx log messages. It is done as a macro
* because working with variadic argument is much easier this way, we can
* interrogate the type of device we are passed (and whether it *is* a &struct
* udevice or &struct device), and dev_printk_emit() can optimize out unused if
* branches.
*
* Because this is a macro, we must enforce type checks ourselves. Ideally, we
* would only accept udevices, but there is a significant amount of code (mostly
* USB) which calls dev_xxx with &struct device. When assigning ``__dev``, we
* must first cast ``dev`` to ``void *`` so we don't get warned when ``dev`` is
* a &struct device. Even though the latter branch is not taken, it will still
* get compiled and type-checked.
*
* The format strings in case of a ``NULL`` ``dev`` MUST be kept the same.
* Otherwise, @fmt will be duplicated in the data section (with slightly
* different prefixes). This is why ``(NULL udevice *)`` is printed as two
* string arguments, and not by string pasting.
*/
#define __dev_printk(level, dev, fmt, ...) \
({ \
if (__same_type(dev, struct device *)) { \
dev_printk_emit(LOG_CATEGORY, level, fmt, ##__VA_ARGS__); \
} else { \
BUILD_BUG_ON(!__same_type(dev, struct udevice *)); \
struct udevice *__dev = (void *)dev; \
if (__dev) \
dev_printk_emit(__dev->driver->id, level, \
"%s %s: " fmt, \
__dev->driver->name, __dev->name, \
##__VA_ARGS__); \
else \
dev_printk_emit(LOG_CATEGORY, level, \
"%s %s: " fmt, \
"(NULL", "udevice *)", \
##__VA_ARGS__); \
} \
})
#define dev_emerg(dev, fmt, ...) \
__dev_printk(LOGL_EMERG, dev, fmt, ##__VA_ARGS__)
#define dev_alert(dev, fmt, ...) \
__dev_printk(LOGL_ALERT, dev, fmt, ##__VA_ARGS__)
#define dev_crit(dev, fmt, ...) \
__dev_printk(LOGL_CRIT, dev, fmt, ##__VA_ARGS__)
#define dev_err(dev, fmt, ...) \
__dev_printk(LOGL_ERR, dev, fmt, ##__VA_ARGS__)
#define dev_warn(dev, fmt, ...) \
__dev_printk(LOGL_WARNING, dev, fmt, ##__VA_ARGS__)
#define dev_notice(dev, fmt, ...) \
__dev_printk(LOGL_NOTICE, dev, fmt, ##__VA_ARGS__)
#define dev_info(dev, fmt, ...) \
__dev_printk(LOGL_INFO, dev, fmt, ##__VA_ARGS__)
#define dev_dbg(dev, fmt, ...) \
__dev_printk(LOGL_DEBUG, dev, fmt, ##__VA_ARGS__)
#define dev_vdbg(dev, fmt, ...) \
__dev_printk(LOGL_DEBUG_CONTENT, dev, fmt, ##__VA_ARGS__)
#endif
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