input: Add MELFAS mms144 touchscreen driver

From: Sanggun Lee<[email protected]>

This is a TSP driver for touchscreen chip mms144 of MELFAS. It uses soft I2C interface and supports single touch.

This driver uses polling method.
If there are touch events, mms144_interrupt() reads and returns 0. If not, mms144_interrupt() returns -1.

Signed-off=by: MyungJoo Ham<[email protected]>

---
  drivers/input/Makefile |    1 +
  drivers/input/mms144.c |  202 ++++++++++++++++++++++++++++++++++++++++++++++++
  include/mms144.h       |   41 ++++++++++
  3 files changed, 244 insertions(+), 0 deletions(-)

create mode 100644 drivers/input/mms144.c
create mode 100644 include/mms144.h

index 0805e86..c802188 100644
@@ -33,6 +33,7 @@ COBJS-$(CONFIG_PS2MULT) += ps2mult.o ps2ser.o
  endif
  COBJS-y += input.o
  COBJS-$(CONFIG_OF_CONTROL) += key_matrix.o
+COBJS-$(CONFIG_MMS144) += mms144.o
  
  COBJS	:= $(COBJS-y)
  SRCS	:= $(COBJS:.o=.c)

-- 1.7.4.1

Dear Donghwa Lee,

Where exactly will this driver be used inside U-Boot? So far, we don't have any GUI support, do what is a touch driver good for?

Are you just adding dead code here?

Best regards,

Wolfgang Denk

DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
You see things; and you say ``Why?'' But I dream  things  that  never
were; and I say ``Why not?''
       - George Bernard Shaw _Back to Methuselah_ (1921) pt. 1, act 1

From: Sanggun Lee

Hi,

We are testing various codes on TRATS board.
If this patch would be submitted, we can test the codes in a pleasant working environment.
If this driver is not used for any other purposes in the u-boot, we would use it only inside
the local tree.

Thank you,
Sanggun Lee

Dear Donghwa Lee,

...

As long as there is no code in mainline U-Boot that actually uses such a driver, it would only be dead code, that does not even get compile-tested. If you are going to add any such code, then please submit the driver again as part of the patch series that includes the "user".

Thanks.

Best regards,

Wolfgang Denk

DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"Confound these ancestors.... They've stolen our best ideas!"
- Ben Jonson