From nobody Sat Nov 23 05:37:46 2024 Received: from mail-wr1-f52.google.com (mail-wr1-f52.google.com [209.85.221.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C4291DDC22; Sun, 17 Nov 2024 18:28:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731868114; cv=none; b=BOgRtjCrby1iVFux18dZGTiC4lRIzEmHwbxA2ejFr9erbfXJxNcaAt9CaK7ewLJ8n+HHaRsvFbS9CMo5BocgNHVWZlzfvXsxnqEXJahUw7ggQUq6iLJ599yT1De/SG/wk5Dd4t5JXXX/bOtdyD+KtXeMTOa90zd8MhgSxkxLcxY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731868114; c=relaxed/simple; bh=Z7P8zkNLYdTfpu5DhAwcHjffAVE5EbJYRzO8KjJdDWM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=to8EGlTnzZ2gDJln/Jd1bmHrM+QidRll59w01RvusfHr9PH7m6xZIWGARDtUnlsXftjfXXsmsDZyZ0tTYoGydv4SNtXFV5io0z02Sed61bwPVEGs5DYGVA8IHEPPHQ4MpWTqaMDZ/IVmsegPzPXNBNRfcgDFc+FlqtFyM7aPAoo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=W4QwwEyd; arc=none smtp.client-ip=209.85.221.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="W4QwwEyd" Received: by mail-wr1-f52.google.com with SMTP id ffacd0b85a97d-38231f84d8fso94679f8f.3; Sun, 17 Nov 2024 10:28:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1731868111; x=1732472911; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=s/7YHZgr3ztO/Z4vG8ysu402O+69tdVx/wSYmqJAcik=; b=W4QwwEydxHulD8E35spQP9lgSCkv9/wurCCdkY3ipVgE93at+bbKQzQxptYWdb1IOn uGTGMsyPW9nUiZhS06FnRdXKdn3I4OGU1L4/FMM2UBmGraY2vUtDI5HrqyRZut1NT5tv Y6Tc6G72qHYq8DZpMb17SzEtRezRkqQ5Fm8d/0iBZ1eORZP9IT0DCwRO0PkxUsBfiPVo gKMVjoZP1/SZkS1/rjoFL810vKTF60Ys/pCL7Ie3DlneH++Irj9DcZhiqd3/v79d3MfR sSKAuf3bBmDD7K2tdfm4yuuvwcPRCm9QjPllKmgww/GOVDWp/ZZTi+2VESPt/HaSWoVH zGDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731868111; x=1732472911; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=s/7YHZgr3ztO/Z4vG8ysu402O+69tdVx/wSYmqJAcik=; b=GXCDhAQDIpTNgV/KyOINRHj9gU3TUdEYImSIJFJothi23YbhH2FcjBXVWL0Lk5+45/ ZOtgUnYH0AimB1XViYwiwlTU/ZczZ7cY91J9vg42DplWw3yjRmB/qKrQXKxuUgqCAfRO 5v26TeZh3x2fRsDsRmIh4A1KliUyoodNQemB+EvhnqYId2h51MI89zZWURBvx4z/QNju K00knBbwp6dtv/bIiaC4VCaL7g9ABK3oUFeCOQ1zEzd0x3Ka4tHvkByYICjSf+qMabjR pyNvLk3p2wT/3FdpkFZONDJ+t6aWtmQVl2sO9wI1+N4QeDbnHPRNjkwa9YTpgfeV/gGH pPkA== X-Forwarded-Encrypted: i=1; AJvYcCVMiNISUI8+R5g8qaaAVvLMW1IlDnJyZdPgc2KgfrfWzdl0mZpezDu2tdTbjAtVzxc5licOtaJ7/Gey4Xs=@vger.kernel.org X-Gm-Message-State: AOJu0Yyy0ZSLLCLHj6EeC1yIsE+c45794oobJ4IhkFyCLqKl62urtXiY 8jdtrOhjRBUAeVIkTpL9Jx47EEs2f3KMpkU7jjlc6Ky7yWuWJB5C X-Gm-Gg: ASbGncseUWhssu6ubX+6VsZHcNAK+VUvs+ztsaz24Y/F+dkm2AXuT4RDO7F6CmIVfSK jfm2/0ZElsJbu58v6ldq7d6Xq6mqDEhP5i4SauRS6B1al6Pwjm25SyYySR1VraXikZTRHOzHful 3HaDAwCCQPnmzxvNkdUbXEC+2WBd83C3mWUG9CfJJu6Zfm0+JMIJiad3HE/s2NtFxDxUxCNex/8 VtdEGbdJPZqNUR6/pJ9HBiNvLFoQs18OC4FTtht2HqtlH2jOTdk6wS6F9OM4PFgbJJLwnXmaP4/ 2Q8SQqv1SVVKWgdjfD71B91F0QYW X-Google-Smtp-Source: AGHT+IEITVBC0lvPuCmdnEbVFgy8ODWuDTFLqnfBjClQ7MvPpmZgoIfPBCQ4/i9CIthX931zsvs8Qw== X-Received: by 2002:a05:6000:4012:b0:378:955f:cc0c with SMTP id ffacd0b85a97d-38225aa2cc0mr3008642f8f.14.1731868110548; Sun, 17 Nov 2024 10:28:30 -0800 (PST) Received: from 5dfbf0f66296.v.cablecom.net (84-72-156-211.dclient.hispeed.ch. [84.72.156.211]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3823f72441bsm3028137f8f.101.2024.11.17.10.28.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 Nov 2024 10:28:30 -0800 (PST) From: Lothar Rubusch To: lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, eraretuya@gmail.com, l.rubusch@gmail.com Subject: [PATCH v2 14/22] iio: accel: adxl345: read FIFO entries Date: Sun, 17 Nov 2024 18:26:43 +0000 Message-Id: <20241117182651.115056-15-l.rubusch@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20241117182651.115056-1-l.rubusch@gmail.com> References: <20241117182651.115056-1-l.rubusch@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a function to read the elements of the adxl345 FIFO. This will flush the FIFO, and brings it into a ready state. The read out is used to read the elemnts and to reset the fifo again. The cleanup equally needs a read on the INT_SOURCE register. Signed-off-by: Lothar Rubusch --- drivers/iio/accel/adxl345_core.c | 40 ++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_c= ore.c index 508de81bb9..40e78dbdb0 100644 --- a/drivers/iio/accel/adxl345_core.c +++ b/drivers/iio/accel/adxl345_core.c @@ -140,6 +140,8 @@ struct adxl34x_state { const struct adxl345_chip_info *info; struct regmap *regmap; struct adxl34x_platform_data data; /* watermark, fifo_mode, etc */ + + __le16 fifo_buf[3 * ADXL34x_FIFO_SIZE] __aligned(IIO_DMA_MINALIGN); u8 int_map; bool fifo_delay; /* delay: delay is needed for SPI */ u8 intio; @@ -323,6 +325,37 @@ static const struct attribute_group adxl345_attrs_grou= p =3D { .attrs =3D adxl345_attrs, }; =20 +/** + * adxl345_get_fifo_entries() - Read number of FIFO entries into *fifo_ent= ries. + * @st: The initialized state instance of this driver. + * @fifo_entries: A field to be initialized by this function with the numb= er of + * FIFO entries. + * + * Since one read on the FIFO is reading all three axis, X, Y and Z in one= , the + * number of FIFO entries corresponds to the number of triples of those va= lues. + * Note, this sensor does not support treating any axis individually, or + * exclude them from measuring. + * + * Return: 0 or error value. + */ +static int adxl345_get_fifo_entries(struct adxl34x_state *st, int *fifo_en= tries) +{ + unsigned int regval =3D 0; + int ret; + + ret =3D regmap_read(st->regmap, ADXL345_REG_FIFO_STATUS, ®val); + if (ret) { + pr_warn("%s(): Failed to read FIFO_STATUS register\n", __func__); + *fifo_entries =3D 0; + return ret; + } + + *fifo_entries =3D 0x3f & regval; + pr_debug("%s(): fifo_entries %d\n", __func__, *fifo_entries); + + return 0; +} + static const struct iio_buffer_setup_ops adxl345_buffer_ops =3D { }; =20 @@ -363,6 +396,7 @@ static irqreturn_t adxl345_trigger_handler(int irq, voi= d *p) struct iio_dev *indio_dev =3D ((struct iio_poll_func *) p)->indio_dev; struct adxl34x_state *st =3D iio_priv(indio_dev); u8 int_stat; + int fifo_entries; int ret; =20 ret =3D adxl345_get_status(st, &int_stat); @@ -380,9 +414,11 @@ static irqreturn_t adxl345_trigger_handler(int irq, vo= id *p) goto done; } =20 - if (int_stat & (ADXL345_INT_DATA_READY | ADXL345_INT_WATERMARK)) + if (int_stat & (ADXL345_INT_DATA_READY | ADXL345_INT_WATERMARK)) { pr_debug("%s(): WATERMARK or DATA_READY event detected\n", __func__); - + if (adxl345_get_fifo_entries(st, &fifo_entries) < 0) + goto done; + } goto done; done: =20 --=20 2.39.5