From patchwork Fri Sep 18 09:33:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Pop X-Patchwork-Id: 11784679 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E5688618 for ; Fri, 18 Sep 2020 11:02:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D44AF21D24 for ; Fri, 18 Sep 2020 11:02:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726115AbgIRLCD (ORCPT ); Fri, 18 Sep 2020 07:02:03 -0400 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:19080 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725941AbgIRLCD (ORCPT ); Fri, 18 Sep 2020 07:02:03 -0400 Received: from pps.filterd (m0167088.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08I9TbKn029171; Fri, 18 Sep 2020 05:34:06 -0400 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 33k5p69ws1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 18 Sep 2020 05:34:05 -0400 Received: from ASHBMBX8.ad.analog.com (ashbmbx8.ad.analog.com [10.64.17.5]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 08I9Y4Dt051002 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Fri, 18 Sep 2020 05:34:04 -0400 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) 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; Fri, 18 Sep 2020 05:34:09 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Fri, 18 Sep 2020 05:34:09 -0400 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 08I9Y18P024038; Fri, 18 Sep 2020 05:34:02 -0400 From: Cristian Pop To: , CC: , Cristian Pop Subject: [PATCH v5] iio: adc: ad7768-1: Add channel label example Date: Fri, 18 Sep 2020 12:33:56 +0300 Message-ID: <20200918093356.93670-1-cristian.pop@analog.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-ADIRoutedOnPrem: True X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-18_11:2020-09-16,2020-09-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 lowpriorityscore=0 impostorscore=0 bulkscore=0 adultscore=0 priorityscore=1501 mlxscore=0 phishscore=0 clxscore=1015 suspectscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009180079 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org This is a demo usage of new "label" attribute for channel. Signed-off-by: Cristian Pop --- Changes in V5: Create a separate patch file for this commit drivers/iio/adc/ad7768-1.c | 49 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index 0d132708c429..5ca9f9febb5a 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -161,6 +161,7 @@ struct ad7768_state { struct completion completion; struct iio_trigger *trig; struct gpio_desc *gpio_sync_in; + const char **labels; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. @@ -407,6 +408,14 @@ static int ad7768_write_raw(struct iio_dev *indio_dev, } } +static int ad7768_read_label(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, char *label) +{ + struct ad7768_state *st = iio_priv(indio_dev); + + return sprintf(label, "%s\n", st->labels[chan->channel]); +} + static struct attribute *ad7768_attributes[] = { &iio_dev_attr_sampling_frequency_available.dev_attr.attr, NULL @@ -420,6 +429,7 @@ static const struct iio_info ad7768_info = { .attrs = &ad7768_group, .read_raw = &ad7768_read_raw, .write_raw = &ad7768_write_raw, + .read_label = ad7768_read_label, .debugfs_reg_access = &ad7768_reg_access, }; @@ -538,6 +548,41 @@ static void ad7768_clk_disable(void *data) clk_disable_unprepare(st->mclk); } +static int ad7768_set_channel_label(struct iio_dev *indio_dev, + int num_channels) +{ + struct ad7768_state *st = iio_priv(indio_dev); + struct device *device = indio_dev->dev.parent; + struct fwnode_handle *fwnode; + struct fwnode_handle *child; + const char *label; + int crt_ch = 0; + + st->labels = devm_kcalloc(indio_dev->dev.parent, + num_channels, + sizeof(**st->labels), + GFP_KERNEL); + + if (!st->labels) + return -ENOMEM; + + fwnode = dev_fwnode(device); + fwnode_for_each_child_node(fwnode, child) { + if (fwnode_property_read_u32(child, "reg", &crt_ch)) + continue; + + if (crt_ch >= num_channels) + continue; + + if (fwnode_property_read_string(child, "label", &label)) + continue; + + st->labels[crt_ch] = label; + } + + return 0; +} + static int ad7768_probe(struct spi_device *spi) { struct ad7768_state *st; @@ -611,6 +656,10 @@ static int ad7768_probe(struct spi_device *spi) init_completion(&st->completion); + ret = ad7768_set_channel_label(indio_dev, ARRAY_SIZE(ad7768_channels)); + if (ret) + return ret; + ret = devm_request_irq(&spi->dev, spi->irq, &ad7768_interrupt, IRQF_TRIGGER_RISING | IRQF_ONESHOT,