[PATCH v8 0/2] Enable capsule loader interface for efi firmware updating

["Kweh, Hock Leong" <hock.leong.kweh-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

From: "Kweh, Hock Leong" <hock.leong.kweh-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Dear maintainers & communities,

This patchset is created on top of Matt's patchset:
1.)https://lkml.org/lkml/2014/10/7/390
"[PATCH 1/2] efi: Move efi_status_to_err() to efi.h"
2.)https://lkml.org/lkml/2014/10/7/391
"[PATCH 2/2] efi: Capsule update support"

It expose a misc char interface for user to upload the capsule binary and
calling efi_capsule_update() API to pass the binary to EFI firmware.

The steps to update efi firmware are:
1.) cat firmware.cap > /dev/efi_capsule_loader
2.) reboot

Any failed upload error message will be returned while doing "cat" through
file operation write() function call.

Tested the code with Intel Quark Galileo GEN1 platform.

Thanks.

---
NOTE:
If Matt agrees with this design, [PATCH v7 1/1] will be squash into his
[PATCH 2/2]: https://lkml.org/lkml/2014/10/7/391 for submitting.

changelog v8:
* further clean up on kunmap() & efi_free_all_buff_pages()
* design enhanced to support 1st few writes are less than efi header size
* removed support to padding capsule and flag error once the upload size
  bigger than header defined size

changelog v7:
* add successful message printed in dmesg
* shorten the code in efi_capsule_write() by splitting out
  efi_capsule_setup_info() & efi_capsule_submit_update() functions
* design added capability to support multiple file open action
* re-write those comments by following standard format
* design added the "uncomplete" error return through flush() file operation

changelog v6:
* clean up on error handling for better code flow and review
* clean up on pr_err() for critical error only
* design taking care writing block that below PAGE_SIZE
* once error has occurred, design will return -EIO until file close
* document design expectations/scenarios in the code
* change the dynamic allocation cap_info struct to statically allocated

changelog v5:
* changed to new design without leveraging firmware_class API
* use misc_char device interface instead of sysfs
* error return through file Write() function call


Kweh, Hock Leong (2):
  efi: export efi_capsule_supported() function symbol
  efi: a misc char interface for user to update efi firmware

 drivers/firmware/efi/Kconfig              |   10
 drivers/firmware/efi/Makefile             |    1
 drivers/firmware/efi/capsule.c            |    1
 drivers/firmware/efi/efi-capsule-loader.c |  356 +++++++++++++++++++++++++++++
 4 files changed, 368 insertions(+)
 create mode 100644 drivers/firmware/efi/efi-capsule-loader.c

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1.7.9.5