input: add MAX8997-haptic driver

MAX8997 has several features in a single chip,
This patchset supports unimplemented haptic driver of MAX8997.

This patchset tested on TRATS board based on EXYNOS4210.

v2
- code clean and remove unnecessary code according to comment of Dmitry Torokhov

v3
- use work_struct to enable/disable max8997-haptic instead of using mutex in irq handler statck of forced feedbacky

Donggeun Kim (2):
mfd: add platform data for MAX8997 haptic driver
input: add driver support for MAX8997-haptic

 drivers/input/misc/Kconfig          |   12 +
 drivers/input/misc/Makefile         |    1 +
 drivers/input/misc/max8997_haptic.c |  377
+++++++++++++++++++++++++++++++++++
 include/linux/mfd/max8997.h         |   53 +++++-
 4 files changed, 442 insertions(+), 1 deletions(-)
 create mode 100644 drivers/input/misc/max8997_haptic.c