From patchwork Mon May 1 23:17:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marijn Suijten X-Patchwork-Id: 13228389 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CBF4C7EE29 for ; Mon, 1 May 2023 23:18:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231397AbjEAXS0 (ORCPT ); Mon, 1 May 2023 19:18:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231337AbjEAXSX (ORCPT ); Mon, 1 May 2023 19:18:23 -0400 Received: from relay07.th.seeweb.it (relay07.th.seeweb.it [IPv6:2001:4b7a:2000:18::168]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D09CF3A97; Mon, 1 May 2023 16:18:19 -0700 (PDT) Received: from localhost.localdomain (94-211-6-86.cable.dynamic.v4.ziggo.nl [94.211.6.86]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by m-r2.th.seeweb.it (Postfix) with ESMTPSA id 3EDB340E6D; Tue, 2 May 2023 01:18:16 +0200 (CEST) From: Marijn Suijten To: phone-devel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, AngeloGioacchino Del Regno , Konrad Dybcio , Martin Botka , Jami Kettunen , Jonathan Cameron , Lars-Peter Clausen , Andy Gross , Bjorn Andersson Cc: Marijn Suijten , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: [PATCH RESEND v3 5/5] iio: adc: qcom-spmi-vadc: Propagate fw node label to userspace Date: Tue, 2 May 2023 01:17:37 +0200 Message-Id: <20230502-iio-adc-propagate-fw-node-label-v3-5-6be5db6e6b5a@somainline.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230502-iio-adc-propagate-fw-node-label-v3-0-6be5db6e6b5a@somainline.org> References: <20230502-iio-adc-propagate-fw-node-label-v3-0-6be5db6e6b5a@somainline.org> MIME-Version: 1.0 X-Mailer: b4 0.12.2 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Set the read_label() callback to return a friendly name provided in DT (firmware), in order to make in_{therm,voltage}X_label attributes show up in sysfs for userspace to consume a channel name. This is particularly useful for custom thermistors being attached to otherwise generically named GPIOs, where the name is known by the board DT. If the channel name isn't set in DT, use the datasheet_name hardcoded in the driver instead. Note that this doesn't fall back to fwnode_get_name() as that provides suboptimally readable names, with an @xx address suffix from board DT. Signed-off-by: Marijn Suijten Reviewed-by: Dmitry Baryshkov --- drivers/iio/adc/qcom-spmi-vadc.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c index bcff0f62b70e0..f5c6f1f27b2c7 100644 --- a/drivers/iio/adc/qcom-spmi-vadc.c +++ b/drivers/iio/adc/qcom-spmi-vadc.c @@ -84,6 +84,7 @@ * that is an average of multiple measurements. * @scale_fn_type: Represents the scaling function to convert voltage * physical units desired by the client for the channel. + * @channel_name: Channel name used in device tree. */ struct vadc_channel_prop { unsigned int channel; @@ -93,6 +94,7 @@ struct vadc_channel_prop { unsigned int hw_settle_time; unsigned int avg_samples; enum vadc_scale_fn_type scale_fn_type; + const char *channel_name; }; /** @@ -495,8 +497,18 @@ static int vadc_fwnode_xlate(struct iio_dev *indio_dev, return -EINVAL; } +static int vadc_read_label(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, char *label) +{ + struct vadc_priv *vadc = iio_priv(indio_dev); + const char *name = vadc->chan_props[chan->address].channel_name; + + return sysfs_emit(label, "%s\n", name); +} + static const struct iio_info vadc_info = { .read_raw = vadc_read_raw, + .read_label = vadc_read_label, .fwnode_xlate = vadc_fwnode_xlate, }; @@ -652,7 +664,7 @@ static int vadc_get_fw_channel_data(struct device *dev, struct vadc_channel_prop *prop, struct fwnode_handle *fwnode) { - const char *name = fwnode_get_name(fwnode); + const char *name = fwnode_get_name(fwnode), *label; u32 chan, value, varr[2]; int ret; @@ -667,6 +679,11 @@ static int vadc_get_fw_channel_data(struct device *dev, return -EINVAL; } + ret = fwnode_property_read_string(fwnode, "label", &label); + if (ret) + label = vadc_chans[chan].datasheet_name; + prop->channel_name = label; + /* the channel has DT description */ prop->channel = chan;