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staging: nvec: Add is_event() and size() functions for nvec_msg 

Add functions nvec_msg_is_event() and nvec_msg_size() which
do just what the say: tell whether the message is an event,
and getting the size of the message.

Signed-off-by: Julian Andres Klode <jak@jak-linux.org>
Acked-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Julian Andres Klode 2011-09-27 19:00:50 +02:00 committed by Greg Kroah-Hartman
parent e7c40851fd
commit 8517e879e0
1 changed files with 31 additions and 0 deletions
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31
drivers/staging/nvec/nvec.c
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@ -114,6 +114,37 @@ static void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg)
atomic_set(&msg->used, 0);
}
/**
* nvec_msg_is_event - Return %true if @msg is an event
* @msg: A message
*/
static bool nvec_msg_is_event(struct nvec_msg *msg)
{
return msg->data[0] >> 7;
}
/**
* nvec_msg_size - Get the size of a message
* @msg: The message to get the size for
*
* This only works for received messages, not for outgoing messages.
*/
static size_t nvec_msg_size(struct nvec_msg *msg)
{
bool is_event = nvec_msg_is_event(msg);
int event_length = (msg->data[0] & 0x60) >> 5;
/* for variable size, payload size in byte 1 + count (1) + cmd (1) */
if (!is_event || event_length == NVEC_VAR_SIZE)
return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0;
else if (event_length == NVEC_2BYTES)
return 2;
else if (event_length == NVEC_3BYTES)
return 3;
else
return 0;
}
static void nvec_gpio_set_value(struct nvec_chip *nvec, int value)
{
dev_dbg(nvec->dev, "GPIO changed from %u to %u\n",