Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757222Ab3GLHTJ (ORCPT ); Fri, 12 Jul 2013 03:19:09 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:43592 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757128Ab3GLHTH (ORCPT ); Fri, 12 Jul 2013 03:19:07 -0400 From: Oleksandr Kozaruk To: , , , , , , , , , , , , , , CC: , , , , Subject: [PATCH v3 0/2] TWL6030, TWL6032 GPADC driver Date: Fri, 12 Jul 2013 10:18:00 +0300 Message-ID: <1373613482-28390-1-git-send-email-oleksandr.kozaruk@ti.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2584 Lines: 73 Hello, v3 - fixed compiler warning v2 - the driver put in drivers/iio, and converted using iio facilities as suggested by Graeme. 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/TWL6032 is a PMIC that has a GPADC with 17/19 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, other 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. Sysfs entries are added to start and read conversion result in millivolts for chosen channel. 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; - iio framework is used 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 iio: twl6030-gpadc: TWL6030, TWL6032 GPADC driver arch/arm/boot/dts/twl6030.dtsi | 6 + drivers/iio/adc/Kconfig | 8 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/twl6030-gpadc.c | 1019 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 1034 insertions(+) create mode 100644 drivers/iio/adc/twl6030-gpadc.c -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/