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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-07-16 22:25:51 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-07-23 13:36:28 +0200 |
| commit | bf54e1462b9192fdef7ea9e2bc44fdc16a4b87bc (patch) | |
| tree | 31ec8e4e13b76d22b7bf9f93ea620e88911fe416 /drivers/firewire/core.h | |
| parent | 850bb6f23b93c04ce1e4509a87fa607dc17d97c1 (diff) | |
| download | blackbird-op-linux-bf54e1462b9192fdef7ea9e2bc44fdc16a4b87bc.tar.gz blackbird-op-linux-bf54e1462b9192fdef7ea9e2bc44fdc16a4b87bc.zip | |
firewire: cdev: add PHY packet reception
Add an FW_CDEV_IOC_RECEIVE_PHY_PACKETS ioctl() and
FW_CDEV_EVENT_PHY_PACKET_RECEIVED poll()/read() event for /dev/fw*.
This can be used to get information from remote PHYs by remote access
PHY packets.
This is also the 2nd half of the functionality (the receive part) to
support a userspace implementation of a VersaPHY transaction layer.
Safety considerations:
- PHY packets are generally broadcasts, hence some kind of elevated
privileges should be required of a process to be able to listen in
on PHY packets. This implementation assumes that a process that is
allowed to open the /dev/fw* of a local node does have this
privilege.
There was an inconclusive discussion about introducing POSIX
capabilities as a means to check for user privileges for these
kinds of operations.
Other limitations:
- PHY packet reception may be switched on by ioctl() but cannot be
switched off again. It would be trivial to provide an off switch,
but this is not worth the code. The client should simply close()
the fd then, or just ignore further events.
- For sake of simplicity of API and kernel-side implementation, no
filter per packet content is provided.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/core.h')
| -rw-r--r-- | drivers/firewire/core.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h index ff6c90922001..3102b6b63438 100644 --- a/drivers/firewire/core.h +++ b/drivers/firewire/core.h @@ -128,6 +128,7 @@ extern const struct file_operations fw_device_ops; void fw_device_cdev_update(struct fw_device *device); void fw_device_cdev_remove(struct fw_device *device); +void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p); /* -device */ @@ -214,6 +215,7 @@ static inline bool is_next_generation(int new_generation, int old_generation) #define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4) #define TCODE_IS_BLOCK_PACKET(tcode) (((tcode) & 1) != 0) +#define TCODE_IS_LINK_INTERNAL(tcode) ((tcode) == 0xe) #define TCODE_IS_REQUEST(tcode) (((tcode) & 2) == 0) #define TCODE_IS_RESPONSE(tcode) (((tcode) & 2) != 0) #define TCODE_HAS_REQUEST_DATA(tcode) (((tcode) & 12) != 4) |
