This series implement support to a drm_dp_aux chardev that allows reading and
writing an arbitrary amount of bytes to arbitrary dpcd register addresses using
regular read, write and lseek operations.
v2:
- 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
v3:
- use drm_dp_aux_dev prefix for public functions
- chardev is named drm_dp_auxN
- read/write don't allocate a buffer anymore, and transfer up to 16 bytes a
time
- remove notifier list from the implementation
- option on menuconfig is now a boolean
- add inline stub functions to avoid breakage when this option is disabled
v4:
- fix build system changes - actually disable this module when not selected.
v5:
- Use kref to avoid device closing while still in use
- Don't use list, use an idr for storing aux_dev
- Remove "connector" attribute
- set aux.dev to the connector drm_connector device, instead of
drm_device
v6:
- Use atomic_t for usage count
- Use a mutex instead of spinlock for idr lock
- Destroy chardev immediately on unregister
- other minor suggestions from Ville
Rafael Antognolli (2):
drm/dp: Add a drm_aux-dev module for reading/writing dpcd registers.
drm/dp: Set aux.dev to the drm_connector device, instead of
drm_device.
drivers/gpu/drm/Kconfig | 8 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_dp_aux_dev.c | 381 +++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_dp_helper.c | 5 +
drivers/gpu/drm/i915/intel_dp.c | 19 +-
include/drm/drm_dp_aux_dev.h | 50 +++++
6 files changed, 447 insertions(+), 17 deletions(-)
create mode 100644 drivers/gpu/drm/drm_dp_aux_dev.c
create mode 100644 include/drm/drm_dp_aux_dev.h
--
2.4.3
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