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Sat, 16 May 2020 02:27:04 +0000 From: Jonathan Bakker To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, robh+dt@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: linus.walleij@linaro.org, Jonathan Bakker Subject: [PATCH 0/2] iio: adc: Add a current from voltage driver Date: Fri, 15 May 2020 19:26:17 -0700 Message-ID: X-Mailer: git-send-email 2.20.1 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-ClientProxiedBy: MWHPR15CA0057.namprd15.prod.outlook.com (2603:10b6:301:4c::19) To BN6PR04MB0660.namprd04.prod.outlook.com (2603:10b6:404:d9::21) X-Microsoft-Original-Message-ID: <20200516022619.30779-1-xc-racer2@live.ca> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from jon-hp-6570b.telus (2001:569:fb68:9c00:8067:f823:1e15:7520) by MWHPR15CA0057.namprd15.prod.outlook.com (2603:10b6:301:4c::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3000.24 via Frontend Transport; Sat, 16 May 2020 02:27:02 +0000 X-Mailer: git-send-email 2.20.1 X-Microsoft-Original-Message-ID: <20200516022619.30779-1-xc-racer2@live.ca> X-TMN: [tL/xLgLgJ2O3QdbhqOTdZwNdQz695nJW7IbzECOR2en4XLfB5mysbCNdkPKSvcj+] X-MS-PublicTrafficType: Email X-IncomingHeaderCount: 48 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-Correlation-Id: 6723c0b7-49ee-4890-d4d7-08d7f9409f06 X-MS-TrafficTypeDiagnostic: DM6NAM11HT164: X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: hnS+r/wuVll5o+L96yntVdua15SJDqP2Mk8JXYlSHluJf4YRiAuNR7RRytxmvvKV3sBa9GYHJv6ki1ynHx2YcG/lR8DbEFRbBUaBPuvwG0cd/tdXsHCNFHaXHNhSLDvqTq8IpA81IEiMff/MLbx58DCxXVIWt9oepHvN0Hp/PLjShvox91b2I/6lG576eqk0BTy2VPW6JFEw2OJPAz7BGKLyeT2UHHOaDDT+tVx8diizhsX4jfT/CZgGJ8Ffkfh7 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:0;SRV:;IPV:NLI;SFV:NSPM;H:BN6PR04MB0660.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:;DIR:OUT;SFP:1901; X-MS-Exchange-AntiSpam-MessageData: gHFkulm66YAOBXy7bTR6XqsD0CS3+SHeyZjWvhferfnQ2Uz7w8+MI9WJF2CpeXUHASb/hbKPICCgz0hFLKXT1q2e24pGNmlX/MNIaTvzJTbr2B7Ph9HF1q4yY17mIsZvQYxBF9ifNh15pzkJrIpY1+VdgLBQVuiiWQg+fq253Kgz+VXiqOW7aRZaBhcyIyvRMGaFM/RiSmewXcPcB3ICOw== X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6723c0b7-49ee-4890-d4d7-08d7f9409f06 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 May 2020 02:27:04.4789 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6NAM11HT164 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the discussion around adding the GP2A002 light driver, there came up the question of what to do when a system emulates a current ADC by using a voltage ADC and a resistor. Rather than adding it on a per-driver basis, it was suggested(1) to add a minimal IIO driver to support this situation. The new driver is fairly simple - it simply takes a voltage ADC and a resistor value in ohms exposed as the scale and outputs a current. It has been tested on a first-gen Galaxy S device which has the above mentioned GP2A002 chip connected to the voltage ADC resistor complex. 1) https://lore.kernel.org/linux-iio/20200202150843.762c6897@archlinux/ Jonathan Bakker (2): dt-bindings: iio: adc: Add binding for current-from-voltage iio: adc: Add current-from-voltage driver .../iio/adc/linux,current-from-voltage.yaml | 47 +++++++ MAINTAINERS | 8 ++ drivers/iio/adc/Kconfig | 9 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/current-from-voltage.c | 123 ++++++++++++++++++ 5 files changed, 188 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/linux,current-from-voltage.yaml create mode 100644 drivers/iio/adc/current-from-voltage.c -- 2.20.1