From: Jasmin Jessich <jasmin@xxxxxx> Some (older) CAMs are really slow in accepting data. I got sometimes the already known error "CAM tried to send a buffer larger than the ecount size". I could track it down to the dvb_ca_en50221_write_data function not waiting between sending the data length high/low and data bytes. In fact the CAM reported a WR error, which triggered later on the mentioned error. The problem is that a simple module parameter can't be used to solve this by adding timer values, because the protocol handler is used for any CI interface. A module parameter would be influence all the CAMs on all CI interfaces. Thus individual timer definitions per CI interface and CAM are required. There are two possibilities to implement that, ioctl's and SysFS. ioctl's require changes in usermode programs and it may take a lot of time to get this implemented there. SysFS can be used by simple "cat" and "echo" commands and can be therefore simply controlled by scripting, which is immediately available. I decided to go for the SysFS approach, but the required device to add the SysFS files was not available in the "struct dvb_device". The first patch of this series adds this device to the structure and also the setting code. The second patch adds the functions to create the SysFS nodes for all timers and the new timeouts in the en50221 protocol driver. The third patch adds the SysFS node documentation. Jasmin Jessich (3): media: dvb-core: Store device structure in dvb_register_device media: dvb-core: Added timers for dvb_ca_en50221_write_data media: dvb-core: Added documentation for ca sysfs timer nodes Documentation/ABI/testing/sysfs-class-ca | 63 +++++++++++ Documentation/media/uapi/dvb/ca-sysfs-nodes.rst | 85 +++++++++++++++ Documentation/media/uapi/dvb/ca.rst | 1 + drivers/media/dvb-core/dvb_ca_en50221.c | 132 +++++++++++++++++++++++- drivers/media/dvb-core/dvbdev.c | 1 + drivers/media/dvb-core/dvbdev.h | 4 +- 6 files changed, 284 insertions(+), 2 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-class-ca create mode 100644 Documentation/media/uapi/dvb/ca-sysfs-nodes.rst -- 2.7.4
