From patchwork Thu Mar 6 21:03:33 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Santos X-Patchwork-Id: 870959 Received: from mx0b-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E16F52702CD; Thu, 6 Mar 2025 21:04:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.135.77 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741295060; cv=none; b=lgJLZ5kXdxkbHjXfomxiWVKaXwoz/kxVvWP6D5ZDGd7V7BRVcP+zxrrAaaedYzvTvG/wl+87Khg2/YlcbEPKm6Y1RUucu/T/ag/5ytzAAPelbhTiyRwJN2PcHHlkXzIJNqHE3mitokq/32UrtWZ6SToHiRpiPGWMrsf8Hhbrdbs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741295060; c=relaxed/simple; bh=3t2yRwtIyHnwZTVmgqlqi10dcp1gLhf9hvtRNpEpyBw=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=r3FtJk9yrJnnOst9uPKlP5GyXpnrYzOaj/vrzKURc0ZzL6p2/nksmJHcJh42CBymvjfVLO9udjm+I2WGXENSBDIcxzSHbxWW9kWvspU1WFJvwc9tW9q81mYecTyCZCFuiAg11ke3VChBh09waXGMMeQ1xDydkuqMY2zEoxZaNR4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=analog.com; spf=pass smtp.mailfrom=analog.com; dkim=pass (2048-bit key) header.d=analog.com header.i=@analog.com header.b=H/0ZMGxM; arc=none smtp.client-ip=148.163.135.77 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=analog.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=analog.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=analog.com header.i=@analog.com header.b="H/0ZMGxM" Received: from pps.filterd (m0375855.ppops.net [127.0.0.1]) by mx0b-00128a01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 526HfeCC032609; Thu, 6 Mar 2025 16:03:58 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=analog.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=DKIM; bh=61VAA O+275msP8/6TVq3mpXFw+06tJEKFkr/npZ9bWE=; b=H/0ZMGxMatamDvCGylalq CCiLIGPEaOOCtrhx7JKEMPgOaSeU7SYmAchdBiehN0ck+mSLfkVA6si+ZLgWoS3f 70mpPCV3ab0USZYHgeIPDQseUH/SJRnL0ZRa/sMnxaQ799CvrO8vBAyqi8owmhfx S6xf2JEbMOGnTVvKISuc0Tx1puZYXfhuN1HhkHMMqy2E9CGpDFce14HiO2X2/78N 3sxLmTPWIr/8puPaChmc/uFB+O52ty8XtKSq5fe+r/qjDRTV1D5JUsuizSZymUTg 5KlPO7QOf++x2yYhvd+wzMZD59JObsZ8eYASlCjKWrvF28gt0ZiEpwDU3KjawpRZ A== Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0b-00128a01.pphosted.com (PPS) with ESMTPS id 457d6x1tcv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 06 Mar 2025 16:03:57 -0500 (EST) 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 526L3uJC031415 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 6 Mar 2025 16:03:56 -0500 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Thu, 6 Mar 2025 16:03:56 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Thu, 6 Mar 2025 16:03:56 -0500 Received: from JSANTO12-L01.ad.analog.com ([10.65.60.206]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 526L3Xhi011547; Thu, 6 Mar 2025 16:03:36 -0500 From: Jonathan Santos To: , , , CC: Jonathan Santos , , , , , , , , , , , , , , , David Lechner Subject: [PATCH v4 13/17] iio: adc: ad7768-1: add multiple scan types to support 16-bits mode Date: Thu, 6 Mar 2025 18:03:33 -0300 Message-ID: <3fa270de049e76799499c0750fd2461d3936afd0.1741268122.git.Jonathan.Santos@analog.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: 10Unp9fDJndqhbp7yZm-MdvDTunf9BYJ X-Proofpoint-ORIG-GUID: 10Unp9fDJndqhbp7yZm-MdvDTunf9BYJ X-Authority-Analysis: v=2.4 cv=E4w3pbdl c=1 sm=1 tr=0 ts=67ca0dbd cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=Vs1iUdzkB0EA:10 a=ajdmHsczAAAA:8 a=gAnH3GRIAAAA:8 a=TVenB2Com6UDTqQwcj8A:9 a=Cd2TjbhyRiE6FbCepFud:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-06_07,2025-03-06_04,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 suspectscore=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 lowpriorityscore=0 malwarescore=0 impostorscore=0 phishscore=0 clxscore=1011 mlxscore=0 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2503060160 When the device is configured to decimation x8, only possible in the sinc5 filter, output data is reduced to 16-bits in order to support 1 MHz of sampling frequency due to clock limitation. Use multiple scan types feature to enable the driver to switch scan type in runtime, making possible to support both 24-bit and 16-bit resolution. Reviewed-by: David Lechner Signed-off-by: Jonathan Santos --- v4 Changes: * None. v3 Changes: * Decreased storagebits to 16 for AD7768_SCAN_TYPE_HIGH_SPEED scan type. v2 Changes: * Included the ".shift" value back to scan_type. * Changed the number of bytes from regmap_read instead of shifting the ADC sample value when the word size is lower (16-bits). --- drivers/iio/adc/ad7768-1.c | 74 ++++++++++++++++++++++++++++++++------ 1 file changed, 64 insertions(+), 10 deletions(-) diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index d1c3bf4f0f45..a51279fa6447 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -142,6 +142,15 @@ struct ad7768_clk_configuration { enum ad7768_pwrmode pwrmode; }; +enum ad7768_scan_type { + AD7768_SCAN_TYPE_NORMAL, + AD7768_SCAN_TYPE_HIGH_SPEED, +}; + +static const int ad7768_mclk_div_rates[4] = { + 16, 8, 4, 2, +}; + static const struct ad7768_clk_configuration ad7768_clk_config[] = { { AD7768_MCLK_DIV_2, AD7768_DEC_RATE_8, 16, AD7768_FAST_MODE }, { AD7768_MCLK_DIV_2, AD7768_DEC_RATE_16, 32, AD7768_FAST_MODE }, @@ -156,6 +165,22 @@ static const struct ad7768_clk_configuration ad7768_clk_config[] = { { AD7768_MCLK_DIV_16, AD7768_DEC_RATE_1024, 16384, AD7768_ECO_MODE }, }; +static const struct iio_scan_type ad7768_scan_type[] = { + [AD7768_SCAN_TYPE_NORMAL] = { + .sign = 's', + .realbits = 24, + .storagebits = 32, + .shift = 8, + .endianness = IIO_BE, + }, + [AD7768_SCAN_TYPE_HIGH_SPEED] = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_BE, + }, +}; + static const struct iio_chan_spec ad7768_channels[] = { { .type = IIO_VOLTAGE, @@ -165,13 +190,9 @@ static const struct iio_chan_spec ad7768_channels[] = { .indexed = 1, .channel = 0, .scan_index = 0, - .scan_type = { - .sign = 's', - .realbits = 24, - .storagebits = 32, - .shift = 8, - .endianness = IIO_BE, - }, + .has_ext_scan_type = 1, + .ext_scan_type = ad7768_scan_type, + .num_ext_scan_type = ARRAY_SIZE(ad7768_scan_type), }, }; @@ -185,6 +206,7 @@ struct ad7768_state { struct clk *mclk; struct gpio_chip gpiochip; unsigned int mclk_freq; + unsigned int dec_rate; unsigned int samp_freq; struct completion completion; struct iio_trigger *trig; @@ -297,6 +319,15 @@ static int ad7768_scan_direct(struct iio_dev *indio_dev) if (ret) return ret; + /* + * When the decimation rate is set to x8, the ADC data precision is + * reduced from 24 bits to 16 bits. Since the AD7768_REG_ADC_DATA + * register provides 24-bit data, the precision is reduced by + * right-shifting the read value by 8 bits. + */ + if (st->dec_rate == 8) + readval >>= 8; + /* * Any SPI configuration of the AD7768-1 can only be * performed in continuous conversion mode. @@ -516,6 +547,8 @@ static int ad7768_set_freq(struct ad7768_state *st, if (ret < 0) return ret; + st->dec_rate = ad7768_clk_config[idx].clk_div / + ad7768_mclk_div_rates[ad7768_clk_config[idx].mclk_div]; st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq, ad7768_clk_config[idx].clk_div); @@ -549,8 +582,13 @@ static int ad7768_read_raw(struct iio_dev *indio_dev, int *val, int *val2, long info) { struct ad7768_state *st = iio_priv(indio_dev); + const struct iio_scan_type *scan_type; int scale_uv, ret; + scan_type = iio_get_current_scan_type(indio_dev, chan); + if (IS_ERR(scan_type)) + return PTR_ERR(scan_type); + switch (info) { case IIO_CHAN_INFO_RAW: ret = iio_device_claim_direct_mode(indio_dev); @@ -559,7 +597,7 @@ static int ad7768_read_raw(struct iio_dev *indio_dev, ret = ad7768_scan_direct(indio_dev); if (ret >= 0) - *val = sign_extend32(ret, chan->scan_type.realbits - 1); + *val = sign_extend32(ret, scan_type->realbits - 1); iio_device_release_direct_mode(indio_dev); if (ret < 0) @@ -573,7 +611,7 @@ static int ad7768_read_raw(struct iio_dev *indio_dev, return scale_uv; *val = (scale_uv * 2) / 1000; - *val2 = chan->scan_type.realbits; + *val2 = scan_type->realbits; return IIO_VAL_FRACTIONAL_LOG2; @@ -617,11 +655,21 @@ static const struct attribute_group ad7768_group = { .attrs = ad7768_attributes, }; +static int ad7768_get_current_scan_type(const struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct ad7768_state *st = iio_priv(indio_dev); + + return st->dec_rate == 8 ? AD7768_SCAN_TYPE_HIGH_SPEED : + AD7768_SCAN_TYPE_NORMAL; +} + 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, + .get_current_scan_type = &ad7768_get_current_scan_type, .debugfs_reg_access = &ad7768_reg_access, }; @@ -676,9 +724,15 @@ static irqreturn_t ad7768_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct ad7768_state *st = iio_priv(indio_dev); + const struct iio_scan_type *scan_type; int ret; - ret = spi_read(st->spi, &st->data.scan.chan, 3); + scan_type = iio_get_current_scan_type(indio_dev, &indio_dev->channels[0]); + if (IS_ERR(scan_type)) + return PTR_ERR(scan_type); + + ret = spi_read(st->spi, &st->data.scan.chan, + BITS_TO_BYTES(scan_type->realbits)); if (ret < 0) goto out;