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Mon, 6 Jan 2020 02:57:56 -0800 Received: from SCSQMBX10.ad.analog.com (10.77.17.5) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Mon, 6 Jan 2020 05:57:55 -0500 Received: from zeus.spd.analog.com (10.64.82.11) by SCSQMBX10.ad.analog.com (10.77.17.5) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Mon, 6 Jan 2020 02:57:55 -0800 Received: from tachici-Precision-5530.ad.analog.com ([10.48.65.175]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 006AvqeV019287; Mon, 6 Jan 2020 05:57:52 -0500 From: Alexandru Tachici To: , CC: , Alexandru Tachici Subject: [PATCH] iio: ad_sigma_delta: Add custom irq flags Date: Mon, 6 Jan 2020 12:57:47 +0200 Message-ID: <20200106105747.8244-1-alexandru.tachici@analog.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ADIRoutedOnPrem: True X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:137.71.25.57;IPV:;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(376002)(346002)(136003)(39860400002)(396003)(189003)(199004)(8676002)(54906003)(110136005)(7636002)(2616005)(478600001)(336012)(8936002)(107886003)(316002)(36756003)(246002)(2906002)(426003)(4326008)(70586007)(6666004)(356004)(70206006)(5660300002)(44832011)(1076003)(186003)(86362001)(7696005)(26005);DIR:OUT;SFP:1101;SCL:1;SRVR:BYAPR03MB3704;H:nwd2mta2.analog.com;FPR:;SPF:Pass;LANG:en;PTR:nwd2mail11.analog.com;MX:1;A:1; X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c7bdf5c1-ed9e-47ed-445e-08d7929749dd X-MS-TrafficTypeDiagnostic: BYAPR03MB3704: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-Forefront-PRVS: 0274272F87 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: u5xSDIdA/VcYXASpJeL6ZvsNmdpe6e0H7B1AXcxpL6hXceYxlvq3py0gtC5AGzRdwPnnbWXvKthgi4c7vf8XVh/FgiyT1MT+3ggZOkWQkrQubE49EllBV9yA/PI6B3mnI9nsn9no9iESi/FdnPIwQ/InL6fLILn0kVkPLN5pZYp2rzC+jCia2j05eh/tD3KxRoe1TaDbYLQolVtAO3pz9Yeendjw60ISPd96kXB3kikJuYzUegbK1+aXZsrdc46kZBBMtO6ax6Ep9nb++/bxR4lXnMFOvFZhy8fO7ce/cdwxnz5zP+hbTudHUys9++wLTE2xUP1VwbrHAYz4upTd2MjstRDAPzVbp1yjc44GYoNHaHOfuji+4lbftJZqpUi5sCmlZkrV+yTNtiLmOrL7hz7w2P4tswWgQ4zE9n+Iqo5UqMw9dXr1gxPIps53JKQU X-OriginatorOrg: analog.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jan 2020 10:57:57.2738 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c7bdf5c1-ed9e-47ed-445e-08d7929749dd X-MS-Exchange-CrossTenant-Id: eaa689b4-8f87-40e0-9c6f-7228de4d754a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=eaa689b4-8f87-40e0-9c6f-7228de4d754a;Ip=[137.71.25.57];Helo=[nwd2mta2.analog.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR03MB3704 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2020-01-06_04:2020-01-06,2020-01-06 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 lowpriorityscore=0 adultscore=0 spamscore=0 clxscore=1015 impostorscore=0 mlxscore=0 malwarescore=0 suspectscore=0 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001060100 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The data-sheet of AD7124, from the Sigma-Delta ADC family, recommends that the falling edge of the DOUT line should be used for an interrupt. The ad_sigma_delta implementation hardcodes the irq trigger type to low, assuming that all Sigma-Delta ADCs have the same interrupt-type. This causes unwanted behaviour. If DOUT line is already low, the interrupt will fire once, when enabled and the irq handler will send a read request to the device. At this time the device has not yet finished the previous conversion and will give a bad reading. This patch allows drivers using the ad_sigma_delta layer to set the irq trigger type to the one specified in the corresponding data-sheet. Signed-off-by: Alexandru Tachici --- drivers/iio/adc/ad_sigma_delta.c | 9 ++++++++- include/linux/iio/adc/ad_sigma_delta.h | 2 ++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c index d10bd0c97233..0007df8d50fb 100644 --- a/drivers/iio/adc/ad_sigma_delta.c +++ b/drivers/iio/adc/ad_sigma_delta.c @@ -454,7 +454,7 @@ static int ad_sd_probe_trigger(struct iio_dev *indio_dev) ret = request_irq(sigma_delta->spi->irq, ad_sd_data_rdy_trig_poll, - IRQF_TRIGGER_LOW, + sigma_delta->irq_flags, indio_dev->name, sigma_delta); if (ret) @@ -540,8 +540,15 @@ EXPORT_SYMBOL_GPL(ad_sd_cleanup_buffer_and_trigger); int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev, struct spi_device *spi, const struct ad_sigma_delta_info *info) { + unsigned long set_trigger_flags; + sigma_delta->spi = spi; sigma_delta->info = info; + + set_trigger_flags = sigma_delta->irq_flags & IRQF_TRIGGER_MASK; + if (set_trigger_flags == IRQF_TRIGGER_NONE) + sigma_delta->irq_flags |= IRQF_TRIGGER_LOW; + iio_device_set_drvdata(indio_dev, sigma_delta); return 0; diff --git a/include/linux/iio/adc/ad_sigma_delta.h b/include/linux/iio/adc/ad_sigma_delta.h index 5ba430cc9a87..94a91731c8e8 100644 --- a/include/linux/iio/adc/ad_sigma_delta.h +++ b/include/linux/iio/adc/ad_sigma_delta.h @@ -53,6 +53,7 @@ struct ad_sigma_delta_info { * struct ad_sigma_delta - Sigma Delta device struct * @spi: The spi device associated with the Sigma Delta device. * @trig: The IIO trigger associated with the Sigma Delta device. + * @irq_flags: flags for the interrupt used by the triggered buffer * * Most of the fields are private to the sigma delta library code and should not * be accessed by individual drivers. @@ -60,6 +61,7 @@ struct ad_sigma_delta_info { struct ad_sigma_delta { struct spi_device *spi; struct iio_trigger *trig; + unsigned long irq_flags; /* private: */ struct completion completion; -- 2.20.1