309 lines
7.1 KiB
C
309 lines
7.1 KiB
C
/*
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* Greybus kernel "version" glue logic.
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*
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* Copyright 2014 Google Inc.
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* Copyright 2014 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*
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* Backports of newer kernel apis to allow the code to build properly on older
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* kernel versions. Remove this file when merging to upstream, it should not be
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* needed at all
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*/
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#ifndef __GREYBUS_KERNEL_VER_H
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#define __GREYBUS_KERNEL_VER_H
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#include <linux/kernel.h>
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#include <linux/version.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0)
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/* Commit: 297d716 power_supply: Change ownership from driver to core */
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#define DRIVER_OWNS_PSY_STRUCT
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#endif
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#ifndef __ATTR_WO
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#define __ATTR_WO(_name) { \
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.attr = { .name = __stringify(_name), .mode = S_IWUSR }, \
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.store = _name##_store, \
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}
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#endif
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#ifndef __ATTR_RW
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#define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO), \
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_name##_show, _name##_store)
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#endif
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#ifndef DEVICE_ATTR_RO
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#define DEVICE_ATTR_RO(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
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#endif
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#ifndef DEVICE_ATTR_WO
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#define DEVICE_ATTR_WO(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
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#endif
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#ifndef DEVICE_ATTR_RW
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#define DEVICE_ATTR_RW(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
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#endif
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#ifndef U8_MAX
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#define U8_MAX ((u8)~0U)
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#endif /* ! U8_MAX */
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#ifndef U16_MAX
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#define U16_MAX ((u16)(~0U))
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#endif /* !U16_MAX */
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#ifndef U32_MAX
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#define U32_MAX ((u32)(~0U))
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#endif /* !U32_MAX */
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#ifndef U64_MAX
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#define U64_MAX ((u64)(~0U))
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#endif /* !U64_MAX */
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/*
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* The GPIO api sucks rocks in places, like removal, so work around their
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* explicit requirements of catching the return value for kernels older than
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* 3.17, which they explicitly changed in the 3.17 kernel. Consistency is
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* overrated.
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*/
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#include <linux/gpio.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
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static inline void gb_gpiochip_remove(struct gpio_chip *chip)
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{
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gpiochip_remove(chip);
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}
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#else
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static inline void gb_gpiochip_remove(struct gpio_chip *chip)
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{
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int ret;
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ret = gpiochip_remove(chip);
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}
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#endif
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/*
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* ATTRIBUTE_GROUPS showed up in 3.11-rc2, but we need to build on 3.10, so add
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* it here.
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*/
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0)
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#include <linux/sysfs.h>
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#define ATTRIBUTE_GROUPS(name) \
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static const struct attribute_group name##_group = { \
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.attrs = name##_attrs, \
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}; \
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static const struct attribute_group *name##_groups[] = { \
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&name##_group, \
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NULL, \
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}
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static inline int sysfs_create_groups(struct kobject *kobj,
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const struct attribute_group **groups)
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{
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int error = 0;
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int i;
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if (!groups)
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return 0;
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for (i = 0; groups[i]; i++) {
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error = sysfs_create_group(kobj, groups[i]);
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if (error) {
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while (--i >= 0)
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sysfs_remove_group(kobj, groups[i]);
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break;
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}
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}
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return error;
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}
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static inline void sysfs_remove_groups(struct kobject *kobj,
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const struct attribute_group **groups)
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{
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int i;
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if (!groups)
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return;
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for (i = 0; groups[i]; i++)
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sysfs_remove_group(kobj, groups[i]);
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}
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
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#define MMC_HS400_SUPPORTED
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#define MMC_DDR52_DEFINED
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
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#define MMC_POWER_UNDEFINED_SUPPORTED
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0)
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#include <linux/scatterlist.h>
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static inline bool sg_miter_get_next_page(struct sg_mapping_iter *miter)
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{
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if (!miter->__remaining) {
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struct scatterlist *sg;
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unsigned long pgoffset;
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if (!__sg_page_iter_next(&miter->piter))
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return false;
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sg = miter->piter.sg;
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pgoffset = miter->piter.sg_pgoffset;
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miter->__offset = pgoffset ? 0 : sg->offset;
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miter->__remaining = sg->offset + sg->length -
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(pgoffset << PAGE_SHIFT) - miter->__offset;
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miter->__remaining = min_t(unsigned long, miter->__remaining,
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PAGE_SIZE - miter->__offset);
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}
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return true;
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}
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static inline bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset)
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{
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sg_miter_stop(miter);
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while (offset) {
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off_t consumed;
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if (!sg_miter_get_next_page(miter))
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return false;
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consumed = min_t(off_t, offset, miter->__remaining);
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miter->__offset += consumed;
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miter->__remaining -= consumed;
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offset -= consumed;
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}
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return true;
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}
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static inline size_t _sg_copy_buffer(struct scatterlist *sgl,
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unsigned int nents, void *buf,
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size_t buflen, off_t skip,
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bool to_buffer)
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{
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unsigned int offset = 0;
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struct sg_mapping_iter miter;
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unsigned long flags;
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unsigned int sg_flags = SG_MITER_ATOMIC;
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if (to_buffer)
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sg_flags |= SG_MITER_FROM_SG;
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else
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sg_flags |= SG_MITER_TO_SG;
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sg_miter_start(&miter, sgl, nents, sg_flags);
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if (!sg_miter_skip(&miter, skip))
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return false;
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local_irq_save(flags);
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while (sg_miter_next(&miter) && offset < buflen) {
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unsigned int len;
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len = min(miter.length, buflen - offset);
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if (to_buffer)
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memcpy(buf + offset, miter.addr, len);
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else
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memcpy(miter.addr, buf + offset, len);
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offset += len;
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}
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sg_miter_stop(&miter);
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local_irq_restore(flags);
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return offset;
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}
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static inline size_t sg_pcopy_to_buffer(struct scatterlist *sgl,
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unsigned int nents, void *buf,
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size_t buflen, off_t skip)
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{
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return _sg_copy_buffer(sgl, nents, buf, buflen, skip, true);
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}
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static inline size_t sg_pcopy_from_buffer(struct scatterlist *sgl,
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unsigned int nents, void *buf,
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size_t buflen, off_t skip)
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{
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return _sg_copy_buffer(sgl, nents, buf, buflen, skip, false);
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}
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
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#define list_last_entry(ptr, type, member) \
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list_entry((ptr)->prev, type, member)
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
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/*
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* Before this version the led classdev did not support groups
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*/
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#define LED_HAVE_GROUPS
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
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/*
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* At this time the internal API for the set brightness was changed to the async
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* version, and one sync API was added to handle cases that need immediate
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* effect. Also, the led class flash and lock for sysfs access was introduced.
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*/
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#define LED_HAVE_SET_SYNC
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#define LED_HAVE_FLASH
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#define LED_HAVE_LOCK
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#include <linux/led-class-flash.h>
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
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/*
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* New change in LED api, the set_sync operation was renamed to set_blocking and
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* the workqueue is now handle by core. So, only one set operation is need.
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*/
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#undef LED_HAVE_SET_SYNC
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#define LED_HAVE_SET_BLOCKING
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
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/*
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* From this version upper it was introduced the possibility to disable led
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* sysfs entries to handle control of the led device to v4l2, which was
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* implemented later. So, before that this should return false.
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*/
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#include <linux/leds.h>
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static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
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{
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return false;
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}
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
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/*
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* New helper functions for registering/unregistering flash led devices as v4l2
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* subdevices were added.
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*/
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#define V4L2_HAVE_FLASH
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#include <media/v4l2-flash-led-class.h>
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0)
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/*
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* Power supply get by name need to drop reference after call
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*/
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#define PSY_HAVE_PUT
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#endif
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#endif /* __GREYBUS_KERNEL_VER_H */
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