From patchwork Fri Oct 15 08:15:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12560507 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C987C433FE for ; Fri, 15 Oct 2021 08:17:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3709D61208 for ; Fri, 15 Oct 2021 08:17:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237126AbhJOITs (ORCPT ); Fri, 15 Oct 2021 04:19:48 -0400 Received: from relay7-d.mail.gandi.net ([217.70.183.200]:43429 "EHLO relay7-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237101AbhJOISN (ORCPT ); Fri, 15 Oct 2021 04:18:13 -0400 Received: (Authenticated sender: miquel.raynal@bootlin.com) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id D75BE2001C; Fri, 15 Oct 2021 08:16:05 +0000 (UTC) From: Miquel Raynal To: Jonathan Cameron , Lee Jones , linux-iio@vger.kernel.org, linux-omap@vger.kernel.org, Thomas Petazzoni , Ryan Barnett , linux-kernel@vger.kernel.org Cc: Miquel Raynal , Jonathan Cameron Subject: [PATCH v6 44/48] iio: adc: ti_am335x_adc: Add the scale information Date: Fri, 15 Oct 2021 10:15:02 +0200 Message-Id: <20211015081506.933180-45-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211015081506.933180-1-miquel.raynal@bootlin.com> References: <20211015081506.933180-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Without the scale, the values returned to the user are just a picture of the input voltage against the full scale range of the ADC. We need to provide the actual conversion factor to get milli-Volts values. Signed-off-by: Miquel Raynal Acked-by: Jonathan Cameron --- drivers/iio/adc/ti_am335x_adc.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index e7dba10b29b4..867690b6c2dd 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -417,6 +417,7 @@ static int tiadc_channel_init(struct device *dev, struct iio_dev *indio_dev, chan->indexed = 1; chan->channel = adc_dev->channel_line[i]; chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); chan->datasheet_name = chan_name_ain[chan->channel]; chan->scan_index = i; chan->scan_type.sign = 'u'; @@ -441,6 +442,23 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, unsigned long timeout; int ret; + switch (mask) { + case IIO_CHAN_INFO_RAW: + break; + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_VOLTAGE: + *val = 1800; + *val2 = chan->scan_type.realbits; + return IIO_VAL_FRACTIONAL_LOG2; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } + if (iio_buffer_enabled(indio_dev)) return -EBUSY;