linux-kernel - [PATCH v1 0/2] TWL6030, TWL6032 GPADC driver

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Date:	Thu, 27 Jun 2013 13:43:36 +0300
From:	Oleksandr Kozaruk <oleksandr.kozaruk@...com>
To:	<rob@...dley.net>, <sameo@...ux.intel.com>,
	<grant.likely@...aro.org>, <rob.herring@...xeda.com>,
	<balajitk@...com>, <gg@...mlogic.co.uk>
CC:	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: [PATCH v1 0/2] TWL6030, TWL6032 GPADC driver

Hello

TWL603[02] GPADC is used to measure battery voltage,
battery temperature, battery presence ID, and could
be used to measure twl603[02] die temperature.
This is used on TI blaze, blaze tablet platforms.

The TWL6030 and TWL6032 have GPADC with 17 and 19
channels respectively. Some channels have current
source and are used for measuring voltage drop
on resistive load for detecting battery ID resistance,
or measuring voltage drop on NTC resistors for external
temperature measurements. Some channels measure voltage,
(i.e. battery voltage), and have inbuilt voltage dividers,
thus, capable to scale voltage. Some channels are dedicated
for measuring die temperature.

Some channels could be calibrated in 2 points, having
offsets from ideal values in trim registers.

The difference between GPADC in TWL6030 and TWL6032:
- 10 bit vs 12 bit ADC;
- 17 vs 19 channels;
- channels have different purpose(i. e. battery voltage
  channel 8 vs channel 18);
- trim values are interpreted differently.

The driver exports function returning converted value for
requested channels: raw code, corrected code, and converted
to mV result.

Sysfs entries are added to start and read conversion result
in millivolts for channel if it has calibration data, or
ADC code(for temperature and test network channels).

The driver is derived from git://git.omapzoom.org/kernel/omap.git
The original driver's authors and contributors are Balaji T K,
Graeme Gregory, Ambresh K, Girish S Ghongdemath.

The changes to the original driver:
- device tree adaptation;
- drop ioctl support - never been used;
- unified measurement method for both devices;
- get rid of "if (device == X)" code style to data driven;
- drop polling end of conversion and use interrupt instead;
- simplified (hopefully) exported external function interface to the driver.

Tested with on blaze tablet 2 with OMAP4430(twl6030), and
OMAP4470(twl6032) SOMs.

The patches were tested against 3.10-rc7

Oleksandr Kozaruk (2):
  ARM: dts: twl: Add GPADC data to device tree
  mfd: twl6030-gpadc: TWL6030, TWL6032 GPADC driver

 .../testing/sysfs-devices-platform-twl6030_gpadc   |    5 +
 arch/arm/boot/dts/twl6030.dtsi                     |    5 +
 drivers/mfd/Kconfig                                |    8 +
 drivers/mfd/Makefile                               |    1 +
 drivers/mfd/twl6030-gpadc.c                        | 1053 ++++++++++++++++++++
 include/linux/i2c/twl6030-gpadc.h                  |   51 +
 6 files changed, 1123 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-devices-platform-twl6030_gpadc
 create mode 100644 drivers/mfd/twl6030-gpadc.c
 create mode 100644 include/linux/i2c/twl6030-gpadc.h

-- 
1.7.9.5

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