From nobody Mon Feb 9 07:43:44 2026 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 F071DEB64DA for ; Wed, 14 Jun 2023 07:56:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236946AbjFNH4a (ORCPT ); Wed, 14 Jun 2023 03:56:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233106AbjFNH41 (ORCPT ); Wed, 14 Jun 2023 03:56:27 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EC9E0106 for ; Wed, 14 Jun 2023 00:56:25 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1q9LMY-000071-TT; Wed, 14 Jun 2023 09:56:18 +0200 Received: from [2a0a:edc0:0:1101:1d::39] (helo=dude03.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1q9LMY-007ItU-1R; Wed, 14 Jun 2023 09:56:18 +0200 Received: from lgo by dude03.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1q9LMX-00EnXI-C0; Wed, 14 Jun 2023 09:56:17 +0200 From: =?UTF-8?q?Leonard=20G=C3=B6hrs?= To: =?UTF-8?q?Leonard=20G=C3=B6hrs?= , kernel@pengutronix.de, Jonathan Cameron , Lars-Peter Clausen Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1] iio: adc: add buffering support to the TI LMP92064 ADC driver Date: Wed, 14 Jun 2023 09:55:36 +0200 Message-Id: <20230614075537.3525194-1-l.goehrs@pengutronix.de> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: lgo@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Enable buffered reading of samples from the LMP92064 ADC. The main benefit of this change is being able to read out current and voltage measurements in a single transfer, allowing instantaneous power measurements. Reads into the buffer can be triggered by any software triggers, e.g. the iio-trig-hrtimer: $ mkdir /sys/kernel/config/iio/triggers/hrtimer/my-trigger $ cat /sys/bus/iio/devices/iio\:device3/name lmp92064 $ iio_readdev -t my-trigger -b 16 iio:device3 | hexdump WARNING: High-speed mode not enabled 0000000 0000 0176 0101 0001 5507 abd5 7645 1768 0000010 0000 016d 0101 0001 ee1e ac6b 7645 1768 ... Signed-off-by: Leonard G=C3=B6hrs --- drivers/iio/adc/ti-lmp92064.c | 54 +++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/drivers/iio/adc/ti-lmp92064.c b/drivers/iio/adc/ti-lmp92064.c index c30ed824924f3..03765c4057dda 100644 --- a/drivers/iio/adc/ti-lmp92064.c +++ b/drivers/iio/adc/ti-lmp92064.c @@ -16,7 +16,10 @@ #include =20 #include +#include #include +#include +#include =20 #define TI_LMP92064_REG_CONFIG_A 0x0000 #define TI_LMP92064_REG_CONFIG_B 0x0001 @@ -91,6 +94,13 @@ static const struct iio_chan_spec lmp92064_adc_channels[= ] =3D { .address =3D TI_LMP92064_CHAN_INC, .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + .scan_index =3D 0, + .scan_type =3D { + .sign =3D 'u', + .realbits =3D 12, + .storagebits =3D 16, + .shift =3D 0, + }, .datasheet_name =3D "INC", }, { @@ -98,8 +108,16 @@ static const struct iio_chan_spec lmp92064_adc_channels= [] =3D { .address =3D TI_LMP92064_CHAN_INV, .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + .scan_index =3D 1, + .scan_type =3D { + .sign =3D 'u', + .realbits =3D 12, + .storagebits =3D 16, + .shift =3D 0, + }, .datasheet_name =3D "INV", }, + IIO_CHAN_SOFT_TIMESTAMP(2), }; =20 static int lmp92064_read_meas(struct lmp92064_adc_priv *priv, u16 *res) @@ -171,6 +189,37 @@ static int lmp92064_read_raw(struct iio_dev *indio_dev, } } =20 +static irqreturn_t lmp92064_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf =3D p; + struct iio_dev *indio_dev =3D pf->indio_dev; + struct lmp92064_adc_priv *priv =3D iio_priv(indio_dev); + int i =3D 0, j, ret; + u16 raw[2]; + u16 *data; + + ret =3D lmp92064_read_meas(priv, raw); + if (ret < 0) + goto done; + + data =3D kmalloc(indio_dev->scan_bytes, GFP_KERNEL); + if (!data) + goto done; + + for_each_set_bit(j, indio_dev->active_scan_mask, indio_dev->masklength) + data[i++] =3D raw[j]; + + iio_push_to_buffers_with_timestamp(indio_dev, data, + iio_get_time_ns(indio_dev)); + + kfree(data); + +done: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + static int lmp92064_reset(struct lmp92064_adc_priv *priv, struct gpio_desc *gpio_reset) { @@ -302,6 +351,11 @@ static int lmp92064_adc_probe(struct spi_device *spi) indio_dev->num_channels =3D ARRAY_SIZE(lmp92064_adc_channels); indio_dev->info =3D &lmp92064_adc_info; =20 + ret =3D devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, + lmp92064_trigger_handler, NULL); + if (ret) + return dev_err_probe(dev, ret, "Failed to setup buffered read\n"); + return devm_iio_device_register(dev, indio_dev); } =20 base-commit: 9561de3a55bed6bdd44a12820ba81ec416e705a7 --=20 2.39.2