[PATCH RFC v2 0/3] Add a drm_aux-dev module.

[Rafael Antognolli]

Second attempt at implementing a module that allows reading/writing arbitrary
dpcd registers. Changes to this version:
	- lseek is used to select the register to read/write;
	- read/write are used instead of ioctl;
	- no blocking_notifier is used, just a direct callback.

One thing to notice is that I am not updating the file offset during read or
write, which is kind of breaking the filesystem abstraction. But i2c-dev
doesn't do it either, so I assumed it's fine.

Rafael Antognolli (3):
  drm/dp: Keep a list of drm_dp_aux helper.
  drm/dp: Store the drm_connector device pointer on the helper.
  drm/dp: Add a drm_aux-dev module for reading/writing dpcd registers.

 drivers/gpu/drm/Kconfig         |   4 +
 drivers/gpu/drm/Makefile        |   1 +
 drivers/gpu/drm/drm_aux-dev.c   | 326 ++++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_dp_helper.c |  73 +++++++++
 drivers/gpu/drm/i915/intel_dp.c |   1 +
 include/drm/drm_dp_helper.h     |   6 +
 6 files changed, 411 insertions(+)
 create mode 100644 drivers/gpu/drm/drm_aux-dev.c

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2.4.3