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 <[email protected]> Acked-by: Marc Dietrich <[email protected]> --- drivers/staging/nvec/nvec.c | 31 +++++++++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-) diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c index 17f5abf..8e97e2d 100644 --- a/drivers/staging/nvec/nvec.c +++ b/drivers/staging/nvec/nvec.c @@ -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", -- 1.7.5.4 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
