[PATCH v5 0/2] input: misc: add support for Imagis ISA1200 haptic motor driver

[Svyatoslav Ryhel <clamor95@gmail.com>]

The ISA1200 is a haptic feedback unit from Imagis Technology using two
motors for haptic feedback in mobile phones. Used in many mobile devices
c. 2012 including Samsung Galxy S Advance GT-I9070 (Janice), Samsung Beam
GT-I8350 (Gavini), LG Optimus 4X P880 and LG Optimus Vu P895.

The exact datasheet for the ISA1200 is not available; all data was modeled
based on available downstream kernel sources for various devices and
fragments of information scattered across the internet.

---
Changes in v5:
- added supplies to private structure
- clk_on dropped
- ret > err
- added active flag to track status
- all hardware manipulations consolidated in start/stop
- dropped mutex from work
- dropped active check from isa1200_vibrator_close it was
  moved to stop directly
- dropped hw maniplations from probe
- bustype set to BUS_I2C
- adjusted error strings
- fixed cancel_work_sync in isa1200_suspend

Changes in v4:
- added INPUT_FF_MEMLESS option selection
- fixed missing clock status set
- guard start/stop calls in isa1200_play_work with lock
- clamp ldo voltages to allowed range
- fixed imagis,pll-div parsing
- dropped Tested-by from schema adding commit

Changes in v3:
- added clock state tracking
- dropped level check in vibrator close
- added clkdiv clamping
- added comments regarding registers 5 and 6

Changes in v2:
- imagis,clk-div switched to accept actual divider value
- dropped DT header
- adjusted imagis,period-ns range
- initiated hctrl0 and hctrl1 values in isa1200_start
- fixed situation when PWM might return -EPROBE_DEFER to be
  treated properly
- added chech a clock or PWM is available
- fixed regulator voltages check being off by 10
- added chech if state.period is not zero
- added action call to disable clock and gpios on error
- used managed version of work init
- added work cancel on suspend
- PW calls are done under mutex lock
---

Linus Walleij (1):
  Input: isa1200 - new driver for Imagis ISA1200

Svyatoslav Ryhel (1):
  dt-bindings: input: Document Imagis ISA1200 haptic motor driver

 .../bindings/input/imagis,isa1200.yaml        | 140 +++++
 drivers/input/misc/Kconfig                    |  12 +
 drivers/input/misc/Makefile                   |   1 +
 drivers/input/misc/isa1200.c                  | 524 ++++++++++++++++++
 4 files changed, 677 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
 create mode 100644 drivers/input/misc/isa1200.c

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2.51.0