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@xxxxxxxxxxxxx>
---
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 ab74b8a..005d389 100644
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -112,6 +112,37 @@ 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
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