tree 5ef107a17e2bcba86dfc8f7238a50d854be7f5f9
parent 7d4fa100b0cc069b2d788e1d9fe086e9e057958e
author Daniel Kurtz <djkurtz@chromium.org> 1340888900 +0800
committer Henrik Rydberg <rydberg@euromail.se> 1340978286 +0200

Input: atmel_mxt_ts - cache T9 reportid range when reading object table

Streamline interrupt processing by caching the T9 reportid range when
first reading the object table.

In the process, refactor reading the object descriptor table.
First, since the object_table entries are now exactly the same layout
in device memory and in the driver, allocate an appropriately sized
array and fetch the entire table directly into it in a single i2c
transaction.  Since a 6 byte table object requires 10 bytes to read,
doing this dramatically reduces overhead.

Note: The cached T9 reportid's are initialized to 0, which is an invalid
reportid.  Thus, the checks in the interrupt handler will always fail for
devices that do not support the T9 object.  Therefore, after doing a
firmware update, the old object table is destroyed and all cached object
values are reset to 0, before reading the new object table, in case
the new firmware does not have the old objects.

This patch tested on an MXT224E.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>