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w1: optional bundling of netlink kernel replies

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Applications can submit a set of commands in one packet to the kernel,
and in some cases it is required such as reading the temperature
sensor results.  This adds an option W1_CN_BUNDLE to the flags of
cn_msg to request the kernel to reply in one packet for efficiency.

The cn_msg flags now check for unknown flag values and return an error
if one is seen.  See "Proper handling of unknown flags in system
calls" http://lwn.net/Articles/588444/

This corrects the ack values returned as per the protocol standard,
namely the original ack for status messages and seq + 1 for all others
such as the data returned from a read.

Some of the common variable names have been standardized as follows.
struct cn_msg *cn
struct w1_netlink_msg *msg
struct w1_netlink_cmd *cmd
struct w1_master *dev

When an argument and a function scope variable would collide, add req_
to the argument.

Signed-off-by: David Fries <[email protected]>
Acked-by: Evgeniy Polyakov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
David Fries 2014-04-08 22:37:09 -05:00 • committed by Greg Kroah-Hartman
commit 8a0427d192
6 changed files with 447 additions and 263 deletions
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2
Documentation/w1/w1.generic
View file

@ -82,7 +82,7 @@ driver - (standard) symlink to the w1 driver
w1_master_add - Manually register a slave device
w1_master_attempts - the number of times a search was attempted
w1_master_max_slave_count
- the maximum slaves that may be attached to a master
- maximum number of slaves to search for at a time
w1_master_name - the name of the device (w1_bus_masterX)
w1_master_pullup - 5V strong pullup 0 enabled, 1 disabled
w1_master_remove - Manually remove a slave device

13
Documentation/w1/w1.netlink
View file

@ -30,7 +30,7 @@ Protocol.
W1_SLAVE_CMD
userspace command for slave device
(read/write/touch)
__u8 res - reserved
__u8 status - error indication from kernel
__u16 len - size of data attached to this header data
union {
__u8 id[8]; - slave unique device id
@ -44,10 +44,14 @@ Protocol.
__u8 cmd - command opcode.
W1_CMD_READ - read command
W1_CMD_WRITE - write command
W1_CMD_TOUCH - touch command
(write and sample data back to userspace)
W1_CMD_SEARCH - search command
W1_CMD_ALARM_SEARCH - alarm search command
W1_CMD_TOUCH - touch command
(write and sample data back to userspace)
W1_CMD_RESET - send bus reset
W1_CMD_SLAVE_ADD - add slave to kernel list
W1_CMD_SLAVE_REMOVE - remove slave from kernel list
W1_CMD_LIST_SLAVES - get slaves list from kernel
__u8 res - reserved
__u16 len - length of data for this command
For read command data must be allocated like for write command
@ -87,8 +91,7 @@ format:
id0 ... idN
Each message is at most 4k in size, so if number of master devices
exceeds this, it will be split into several messages,
cn.seq will be increased for each one.
exceeds this, it will be split into several messages.
W1 search and alarm search commands.
request: