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kernel_ver.h
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kernel_ver.h
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/*
* Greybus kernel "version" glue logic.
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*
* Backports of newer kernel apis to allow the code to build properly on older
* kernel versions. Remove this file when merging to upstream, it should not be
* needed at all
*/
#ifndef __GREYBUS_KERNEL_VER_H
#define __GREYBUS_KERNEL_VER_H
#ifndef __ATTR_WO
#define __ATTR_WO(_name) { \
.attr = { .name = __stringify(_name), .mode = S_IWUSR }, \
.store = _name##_store, \
}
#endif
#ifndef __ATTR_RW
#define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO), \
_name##_show, _name##_store)
#endif
#ifndef DEVICE_ATTR_RO
#define DEVICE_ATTR_RO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
#endif
#ifndef DEVICE_ATTR_WO
#define DEVICE_ATTR_WO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
#endif
#ifndef DEVICE_ATTR_RW
#define DEVICE_ATTR_RW(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
#endif
#ifndef U8_MAX
#define U8_MAX ((u8)~0U)
#endif /* ! U8_MAX */
#ifndef U16_MAX
#define U16_MAX ((u16)(~0U))
#endif /* !U16_MAX */
/*
* The GPIO api sucks rocks in places, like removal, so work around their
* explicit requirements of catching the return value for kernels older than
* 3.17, which they explicitly changed in the 3.17 kernel. Consistency is
* overrated.
*/
#include <linux/version.h>
#include <linux/gpio.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
static inline void gb_gpiochip_remove(struct gpio_chip *chip)
{
gpiochip_remove(chip);
}
#else
static inline void gb_gpiochip_remove(struct gpio_chip *chip)
{
int ret;
ret = gpiochip_remove(chip);
}
#endif
/*
* ATTRIBUTE_GROUPS showed up in 3.11-rc2, but we need to build on 3.10, so add
* it here.
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0)
#define ATTRIBUTE_GROUPS(name) \
static const struct attribute_group name##_group = { \
.attrs = name##_attrs, \
}; \
static const struct attribute_group *name##_groups[] = { \
&name##_group, \
NULL, \
}
#endif
#endif /* __GREYBUS_KERNEL_VER_H */