From patchwork Tue Dec 8 13:19:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Pop X-Patchwork-Id: 11958577 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A1B5C2D0E4 for ; Tue, 8 Dec 2020 13:16:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 143BA23AA9 for ; Tue, 8 Dec 2020 13:16:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728758AbgLHNQG (ORCPT ); Tue, 8 Dec 2020 08:16:06 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:20610 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727135AbgLHNQF (ORCPT ); Tue, 8 Dec 2020 08:16:05 -0500 Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 0B8DBPLn015651; Tue, 8 Dec 2020 08:15:24 -0500 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 3588090xrk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 08 Dec 2020 08:15:24 -0500 Received: from ASHBMBX9.ad.analog.com (ASHBMBX9.ad.analog.com [10.64.17.10]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 0B8DFNcG049670 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 8 Dec 2020 08:15:23 -0500 Received: from ASHBCASHYB4.ad.analog.com (10.64.17.132) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Tue, 8 Dec 2020 08:15:22 -0500 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) by ASHBCASHYB4.ad.analog.com (10.64.17.132) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.721.2; Tue, 8 Dec 2020 08:15:22 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Tue, 8 Dec 2020 08:15:22 -0500 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 0B8DFKdS000595; Tue, 8 Dec 2020 08:15:20 -0500 From: Cristian Pop To: , CC: , , , Cristian Pop Subject: [PATCH v3 1/3] dt-bindings: iio: dac: AD5766 yaml documentation Date: Tue, 8 Dec 2020 15:19:55 +0200 Message-ID: <20201208131957.34381-1-cristian.pop@analog.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2020-12-08_09:2020-12-08,2020-12-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 bulkscore=0 impostorscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 mlxlogscore=999 clxscore=1015 priorityscore=1501 malwarescore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012080081 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org This adds device tree bindings for the AD5766 DAC. Signed-off-by: Cristian Pop Reviewed-by: Rob Herring --- Changes in v3: - Fix errors .../bindings/iio/dac/adi,ad5766.yaml | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml new file mode 100644 index 000000000000..25ec5bc0a6c6 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml @@ -0,0 +1,58 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2020 Analog Devices Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/dac/adi,ad5766.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices AD5766 DAC device driver + +maintainers: + - Cristian Pop + +description: | + Bindings for the Analog Devices AD5766 current DAC device. Datasheet can be + found here: + https://www.analog.com/media/en/technical-documentation/data-sheets/ad5766-5767.pdf + +properties: + compatible: + enum: + - adi,ad5766 + - adi,ad5767 + + reg: + maxItems: 1 + + spi-max-frequency: + maximum: 1000000 + + spi-cpol: true + + reset-gpios: + description: GPIO spec for the RESET pin. If specified, it will be + asserted during driver probe. + maxItems: 1 + +required: + - compatible + - reg + - spi-max-frequency + - spi-cpol + +additionalProperties: false + +examples: + - | + spi { + #address-cells = <1>; + #size-cells = <0>; + + ad5766@0 { + compatible = "adi,ad5766"; + reg = <0>; + spi-cpol; + spi-max-frequency = <1000000>; + reset-gpios = <&gpio 22 0>; + }; + }; From patchwork Tue Dec 8 13:19:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Pop X-Patchwork-Id: 11958575 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02013C2BBCF for ; Tue, 8 Dec 2020 13:16:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3A8223AA9 for ; Tue, 8 Dec 2020 13:16:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729046AbgLHNQJ (ORCPT ); Tue, 8 Dec 2020 08:16:09 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:23754 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727135AbgLHNQI (ORCPT ); Tue, 8 Dec 2020 08:16:08 -0500 Received: from pps.filterd (m0167088.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 0B8D9kI5009873; Tue, 8 Dec 2020 08:15:25 -0500 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 3584x99akd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 08 Dec 2020 08:15:25 -0500 Received: from ASHBMBX9.ad.analog.com (ASHBMBX9.ad.analog.com [10.64.17.10]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 0B8DFOg4049673 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 8 Dec 2020 08:15:24 -0500 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Tue, 8 Dec 2020 08:15:23 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Tue, 8 Dec 2020 08:15:23 -0500 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 0B8DFKdT000595; Tue, 8 Dec 2020 08:15:22 -0500 From: Cristian Pop To: , CC: , , , Cristian Pop Subject: [PATCH v3 2/3] Documentation/ABI/testing: Add documentation for AD5766 new ABI Date: Tue, 8 Dec 2020 15:19:56 +0200 Message-ID: <20201208131957.34381-2-cristian.pop@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201208131957.34381-1-cristian.pop@analog.com> References: <20201208131957.34381-1-cristian.pop@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2020-12-08_09:2020-12-08,2020-12-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 mlxlogscore=999 adultscore=0 phishscore=0 mlxscore=0 clxscore=1015 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012080081 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org New interface is proposed for dither functionality. This future allows composing an external signals to the selected output channel. The dither signal can be turned on/off, scaled, inverted, or it can be selected from different sources. Signed-off-by: Cristian Pop --- .../ABI/testing/sysfs-bus-iio-dac-ad5766 | 45 +++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766 diff --git a/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766 b/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766 new file mode 100644 index 000000000000..361bbd0862df --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766 @@ -0,0 +1,45 @@ +What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_pwr +KernelVersion: +Contact: linux-iio@vger.kernel.org +Description: + Dither power on/off. Write 0 to power on dither or 1 to power it off. + +What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_invert +KernelVersion: +Contact: linux-iio@vger.kernel.org +Description: + Inverts the dither applied to the selected DAC channel. Dither signal is + not inverted (default) Dither signal is inverted. + +What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale_available +KernelVersion: +Contact: linux-iio@vger.kernel.org +Description: + Returns possible scalings available for the current channel: + "NO_SCALING 75%_SCALING 50%_SCALING 25%_SCALING" + +What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale +KernelVersion: +Contact: linux-iio@vger.kernel.org +Description: + Scales the dither before it is applied to the selected channel. + NO_SCALING - No scaling + 75%_SCALING - 75% scaling + 50%_SCALING - 50% scaling + 25%_SCALING - 25% scaling + +What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_source_available +KernelVersion: +Contact: linux-iio@vger.kernel.org +Description: + Returns possible dither sources available for the selected channel: + "NO_DITHER N0 N1" + +What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_source +KernelVersion: +Contact: linux-iio@vger.kernel.org +Description: + Selects dither source applied to the selected channel. + NO_DITHER - No dither applied + N0 - N0 dither signal applied + N1 - N1 dither signal applied From patchwork Tue Dec 8 13:19:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Pop X-Patchwork-Id: 11958573 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD77FC2BBCD for ; Tue, 8 Dec 2020 13:16:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9EAF023AA9 for ; Tue, 8 Dec 2020 13:16:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729149AbgLHNQK (ORCPT ); Tue, 8 Dec 2020 08:16:10 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:24678 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726338AbgLHNQK (ORCPT ); Tue, 8 Dec 2020 08:16:10 -0500 Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 0B8DBPbl015642; Tue, 8 Dec 2020 08:15:27 -0500 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 3588090xrp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 08 Dec 2020 08:15:27 -0500 Received: from ASHBMBX9.ad.analog.com (ASHBMBX9.ad.analog.com [10.64.17.10]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 0B8DFQ4b049676 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 8 Dec 2020 08:15:26 -0500 Received: from ASHBCASHYB4.ad.analog.com (10.64.17.132) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Tue, 8 Dec 2020 08:15:25 -0500 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) by ASHBCASHYB4.ad.analog.com (10.64.17.132) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.721.2; Tue, 8 Dec 2020 08:15:24 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Tue, 8 Dec 2020 08:15:24 -0500 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 0B8DFKdU000595; Tue, 8 Dec 2020 08:15:23 -0500 From: Cristian Pop To: , CC: , , , Cristian Pop Subject: [PATCH v3 3/3] iio: dac: ad5766: add driver support for AD5766 Date: Tue, 8 Dec 2020 15:19:57 +0200 Message-ID: <20201208131957.34381-3-cristian.pop@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201208131957.34381-1-cristian.pop@analog.com> References: <20201208131957.34381-1-cristian.pop@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2020-12-08_09:2020-12-08,2020-12-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 bulkscore=0 impostorscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 mlxlogscore=999 clxscore=1011 priorityscore=1501 malwarescore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012080081 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The AD5766/AD5767 are 16-channel, 16-bit/12-bit, voltage output dense DACs Digital-to-Analog converters. This change adds support for these DACs. Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ad5766-5767.pdf Signed-off-by: Cristian Pop --- Changelog in v3: - Add ABI doc - Add build files - Fix build, define local macro "IIO_ENUM_AVAILABLE_SHARED" - Better description for "lock" variable - Use "put_unaligned_xx16"a - Rename to: "_ad5766_spi_write" and "_ad5766_spi_read" from "_ad5766_spi_write" and "_ad5766_spi_read" drivers/iio/dac/Kconfig | 10 + drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ad5766.c | 766 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 777 insertions(+) create mode 100644 drivers/iio/dac/ad5766.c diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index 6f6074a5d3db..cea07b4cced1 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -189,6 +189,16 @@ config AD5764 To compile this driver as a module, choose M here: the module will be called ad5764. +config AD5766 + tristate "Analog Devices AD5766/AD5767 DAC driver" + depends on SPI_MASTER + help + Say yes here to build support for Analog Devices AD5766, AD5767 + Digital to Analog Converter. + + To compile this driver as a module, choose M here: the + module will be called ad5766. + config AD5770R tristate "Analog Devices AD5770R IDAC driver" depends on SPI_MASTER diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 2fc481167724..33e16f14902a 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_AD5755) += ad5755.o obj-$(CONFIG_AD5755) += ad5758.o obj-$(CONFIG_AD5761) += ad5761.o obj-$(CONFIG_AD5764) += ad5764.o +obj-$(CONFIG_AD5766) += ad5766.o obj-$(CONFIG_AD5770R) += ad5770r.o obj-$(CONFIG_AD5791) += ad5791.o obj-$(CONFIG_AD5686) += ad5686.o diff --git a/drivers/iio/dac/ad5766.c b/drivers/iio/dac/ad5766.c new file mode 100644 index 000000000000..3c634d63a6db --- /dev/null +++ b/drivers/iio/dac/ad5766.c @@ -0,0 +1,766 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices AD5766, AD5767 + * Digital to Analog Converters driver + * + * Copyright 2019-2020 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define AD5766_UPPER_WORD_SPI_MASK GENMASK(31, 16) +#define AD5766_LOWER_WORD_SPI_MASK GENMASK(15, 0) +#define AD5766_DITHER_SOURCE_MASK(x) GENMASK(((2 * x) + 1), (2 * x)) +#define AD5766_DITHER_SCALE_MASK(x) AD5766_DITHER_SOURCE_MASK(x) + +#define AD5766_CMD_NOP_MUX_OUT 0x00 +#define AD5766_CMD_SDO_CNTRL 0x01 +#define AD5766_CMD_WR_IN_REG(x) (0x10 | ((x) & 0xF)) +#define AD5766_CMD_WR_DAC_REG(x) (0x20 | ((x) & 0xF)) +#define AD5766_CMD_SW_LDAC 0x30 +#define AD5766_CMD_SPAN_REG 0x40 +#define AD5766_CMD_WR_PWR_DITHER 0x51 +#define AD5766_CMD_WR_DAC_REG_ALL 0x60 +#define AD5766_CMD_SW_FULL_RESET 0x70 +#define AD5766_CMD_READBACK_REG(x) (0x80 | ((x) & 0xF)) +#define AD5766_CMD_DITHER_SIG_1 0x90 +#define AD5766_CMD_DITHER_SIG_2 0xA0 +#define AD5766_CMD_INV_DITHER 0xB0 +#define AD5766_CMD_DITHER_SCALE_1 0xC0 +#define AD5766_CMD_DITHER_SCALE_2 0xD0 + +#define AD5766_FULL_RESET_CODE 0x1234 + +enum ad5766_type { + ID_AD5766, + ID_AD5767, +}; + +enum ad5766_voltage_range { + AD5766_VOLTAGE_RANGE_M20V_0V, + AD5766_VOLTAGE_RANGE_M16V_to_0V, + AD5766_VOLTAGE_RANGE_M10V_to_0V, + AD5766_VOLTAGE_RANGE_M12V_to_14V, + AD5766_VOLTAGE_RANGE_M16V_to_10V, + AD5766_VOLTAGE_RANGE_M10V_to_6V, + AD5766_VOLTAGE_RANGE_M5V_to_5V, + AD5766_VOLTAGE_RANGE_M10V_to_10V, + AD5766_VOLTAGE_RANGE_MAX, +}; + +/** + * struct ad5766_chip_info - chip specific information + * @num_channels: number of channels + * @channel: channel specification + */ +struct ad5766_chip_info { + unsigned int num_channels; + const struct iio_chan_spec *channels; +}; + +enum { + AD5766_DITHER_PWR, + AD5766_DITHER_INVERT +}; + +/* + * External dither signal can be composed with the DAC output, if activated. + * The dither signals are applied to the N0 and N1 input pins. + * Dither source for each of the channel can be selected by writing to + * "dither_source",a 32 bit variable and two bits are used for each of the 16 + * channels: 0: NO_DITHER, 1: N0, 2: N1. + * This variable holds available dither source strings. + */ +static const char * const ad5766_dither_sources[] = { + "NO_DITHER", + "N0", + "N1", +}; + +/* + * Dither signal can also be scaled. + * Available dither scale strings coresponding to "dither_scale" field in + * "struct ad5766_state". + * "dither_scale" is a 32 bit variable and two bits are used for each of the 16 + * channels: 0: NO_SCALING, 1: 75%_SCALING, 2: 50%_SCALING, 3: 25%_SCALING. + */ +static const char * const ad5766_dither_scales[] = { + "NO_SCALING", + "75%_SCALING", + "50%_SCALING", + "25%_SCALING", +}; + +/** + * struct ad5766_state - driver instance specific data + * @spi: SPI device + * @lock: Lock used to restrict concurent access to SPI device + * @chip_info: Chip model specific constants + * @gpio_reset: Reset GPIO, used to reset the device + * @crt_range: Current selected output range + * @cached_offset: Cached range coresponding to the selected offset + * @dither_power_ctrl: Power-down bit for each channel dither block (for + * example, D15 = DAC 15,D8 = DAC 8, and D0 = DAC 0) + * 0 - Normal operation, 1 - Power down + * @dither_invert: Inverts the dither signal applied to the selected DAC + * outputs + * @dither_source: Selects between 3 possible sources: + * 0: No dither, 1: N0, 2: N1 + * Two bits are used for each channel + * @dither_scale: Selects between 4 possible scales: + * 0: No scale, 1: 75%, 2: 50%, 3: 25% + * Two bits are used for each channel + * @scale_avail: Scale available table + * @offset_avail: Offest available table + * @data: SPI transfer buffers + */ +struct ad5766_state { + struct spi_device *spi; + struct mutex lock; + const struct ad5766_chip_info *chip_info; + struct gpio_desc *gpio_reset; + enum ad5766_voltage_range crt_range; + enum ad5766_voltage_range cached_offset; + u16 dither_power_ctrl; + u16 dither_invert; + u32 dither_source; + u32 dither_scale; + int scale_avail[AD5766_VOLTAGE_RANGE_MAX][2]; + int offset_avail[AD5766_VOLTAGE_RANGE_MAX][2]; + union { + u32 d32; + u16 w16[2]; + u8 b8[4]; + } data[3] ____cacheline_aligned; +}; + +struct ad5766_span_tbl { + int min; + int max; +}; + +static const struct ad5766_span_tbl ad5766_span_tbl[] = { + [AD5766_VOLTAGE_RANGE_M20V_0V] = { + .min = -20, + .max = 0, + }, + [AD5766_VOLTAGE_RANGE_M16V_to_0V] = { + .min = -16, + .max = 0, + }, + [AD5766_VOLTAGE_RANGE_M10V_to_0V] = { + .min = -10, + .max = 0, + }, + [AD5766_VOLTAGE_RANGE_M12V_to_14V] = { + .min = -12, + .max = 14, + }, + [AD5766_VOLTAGE_RANGE_M16V_to_10V] = { + .min = -16, + .max = 10, + }, + [AD5766_VOLTAGE_RANGE_M10V_to_6V] = { + .min = -10, + .max = 6, + }, + [AD5766_VOLTAGE_RANGE_M5V_to_5V] = { + .min = -5, + .max = 5, + }, + [AD5766_VOLTAGE_RANGE_M10V_to_10V] = { + .min = -10, + .max = 10, + }, +}; + +static int __ad5766_spi_read(struct ad5766_state *st, u8 dac, int *val) +{ + int ret; + struct spi_transfer xfers[] = { + { + .tx_buf = &st->data[0].d32, + .bits_per_word = 8, + .len = 3, + .cs_change = 1, + }, { + .tx_buf = &st->data[1].d32, + .rx_buf = &st->data[2].d32, + .bits_per_word = 8, + .len = 3, + }, + }; + + st->data[0].d32 = AD5766_CMD_READBACK_REG(dac); + st->data[1].d32 = AD5766_CMD_NOP_MUX_OUT; + + ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers)); + if (ret) + return ret; + + *val = st->data[2].w16[1]; + + return ret; +} + +static int __ad5766_spi_write(struct ad5766_state *st, u8 command, u16 data) +{ + st->data[0].b8[0] = command; + put_unaligned_be16(data, &st->data[0].b8[1]); + + return spi_write(st->spi, &st->data[0].b8[0], 3); +} + +static int ad5766_read(struct iio_dev *indio_dev, u8 dac, int *val) +{ + struct ad5766_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&st->lock); + ret = __ad5766_spi_read(st, dac, val); + mutex_unlock(&st->lock); + + return ret; +} + +static int ad5766_write(struct iio_dev *indio_dev, u8 dac, u16 data) +{ + struct ad5766_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&st->lock); + ret = __ad5766_spi_write(st, AD5766_CMD_WR_DAC_REG(dac), data); + mutex_unlock(&st->lock); + + return ret; +} + +static int ad5766_reset(struct ad5766_state *st) +{ + int ret = 0; + + if (st->gpio_reset) { + gpiod_set_value_cansleep(st->gpio_reset, 0); + ndelay(100); /* t_reset >= 100ns */ + gpiod_set_value_cansleep(st->gpio_reset, 1); + } else { + ret = __ad5766_spi_write(st, AD5766_CMD_SW_FULL_RESET, + AD5766_FULL_RESET_CODE); + if (ret < 0) + return ret; + } + + /* + * Minimum time between a reset and the subsequent successful write is + * typically 25 ns + */ + ndelay(25); + + return 0; +} + +static int ad5766_default_setup(struct ad5766_state *st, + enum ad5766_voltage_range range) +{ + int ret; + uint16_t val; + + /* Always issue a software reset before writing to the span register. */ + ret = ad5766_reset(st); + if (ret) + return ret; + + ret = __ad5766_spi_write(st, AD5766_CMD_SPAN_REG, range); + if (ret) + return ret; + + st->crt_range = range; + st->cached_offset = range; + + st->dither_power_ctrl = 0; + ret = __ad5766_spi_write(st, AD5766_CMD_WR_PWR_DITHER, + st->dither_power_ctrl); + if (ret) + return ret; + + st->dither_source = 0; + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_source); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SIG_1, + st->dither_source & 0xFFFF); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_source); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SIG_2, val); + if (ret) + return ret; + + st->dither_scale = 0; + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_scale); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SCALE_1, val); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_scale); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SCALE_2, val); + if (ret) + return ret; + + st->dither_invert = 0; + ret = __ad5766_spi_write(st, AD5766_CMD_INV_DITHER, st->dither_invert); + if (ret) + return ret; + + return 0; +} + +static int ad5766_set_offset(struct ad5766_state *st, int val, int val2) +{ + int i; + s32 (*tbl)[AD5766_VOLTAGE_RANGE_MAX][2] = &(st->offset_avail); + + for (i = 0; i < AD5766_VOLTAGE_RANGE_MAX; i++) { + if ((*tbl)[i][0] == val && (*tbl)[i][1] == val2) { + st->cached_offset = i; + return 0; + } + } + + return -EINVAL; +} + +static int ad5766_set_scale(struct ad5766_state *st, int val, int val2) +{ + int i; + enum ad5766_voltage_range offset_idx = st->cached_offset; + s32 (*offset_tbl)[AD5766_VOLTAGE_RANGE_MAX][2] = &(st->offset_avail); + s32 (*scale_tbl)[AD5766_VOLTAGE_RANGE_MAX][2] = &(st->scale_avail); + + for (i = 0; i < AD5766_VOLTAGE_RANGE_MAX; i++) { + if ((*scale_tbl)[i][0] != val || (*scale_tbl)[i][1] != val2) + continue; + + if ((*offset_tbl)[i][0] != (*offset_tbl)[offset_idx][0] || + (*offset_tbl)[i][1] != (*offset_tbl)[offset_idx][1]) + continue; + + return ad5766_default_setup(st, i); + } + + return -EINVAL; +} + +static int ad5766_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + struct ad5766_state *st = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + *vals = (const int *)st->scale_avail; + *type = IIO_VAL_INT_PLUS_MICRO; + /* Values are stored in a 2D matrix */ + *length = AD5766_VOLTAGE_RANGE_MAX * 2; + + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_OFFSET: + *vals = (const int *)st->offset_avail; + *type = IIO_VAL_INT_PLUS_MICRO; + /* Values are stored in a 2D matrix */ + *length = AD5766_VOLTAGE_RANGE_MAX * 2; + + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int ad5766_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + int ret; + struct ad5766_state *st = iio_priv(indio_dev); + + switch (m) { + case IIO_CHAN_INFO_RAW: + ret = ad5766_read(indio_dev, chan->address, val); + if (ret) + return ret; + + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val = st->scale_avail[st->crt_range][0]; + *val2 = st->scale_avail[st->crt_range][1]; + + return IIO_VAL_INT_PLUS_MICRO; + + case IIO_CHAN_INFO_OFFSET: + *val = st->offset_avail[st->crt_range][0]; + *val2 = st->offset_avail[st->crt_range][1]; + + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static int ad5766_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long info) +{ + struct ad5766_state *st = iio_priv(indio_dev); + + switch (info) { + case IIO_CHAN_INFO_RAW: + { + const int max_val = (1 << chan->scan_type.realbits); + + if (val >= max_val || val < 0) + return -EINVAL; + val <<= chan->scan_type.shift; + return ad5766_write(indio_dev, chan->address, val); + } + case IIO_CHAN_INFO_OFFSET: + return ad5766_set_offset(st, val, val2); + case IIO_CHAN_INFO_SCALE: + return ad5766_set_scale(st, val, val2); + default: + return -EINVAL; + } +} + +static const struct iio_info ad5766_info = { + .read_raw = ad5766_read_raw, + .write_raw = ad5766_write_raw, + .read_avail = ad5766_read_avail, +}; + +static int ad5766_get_dither_source(struct iio_dev *dev, + const struct iio_chan_spec *chan) +{ + struct ad5766_state *st = iio_priv(dev); + u32 source; + + source = st->dither_source & AD5766_DITHER_SOURCE_MASK(chan->channel); + + return (source >> chan->channel * 2); +} + +static int ad5766_set_dither_source(struct iio_dev *dev, + const struct iio_chan_spec *chan, + unsigned int mode) +{ + int ret; + struct ad5766_state *st = iio_priv(dev); + uint16_t val; + + st->dither_source &= ~AD5766_DITHER_SOURCE_MASK(chan->channel); + st->dither_source |= (mode << (chan->channel * 2)); + + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_source); + ret = ad5766_write(dev, AD5766_CMD_DITHER_SIG_1, val); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_source); + return ad5766_write(dev, AD5766_CMD_DITHER_SIG_2, val); +} + +static const struct iio_enum ad5766_dither_source_enum = { + .items = ad5766_dither_sources, + .num_items = ARRAY_SIZE(ad5766_dither_sources), + .set = ad5766_set_dither_source, + .get = ad5766_get_dither_source, +}; + +static int ad5766_get_dither_scale(struct iio_dev *dev, + const struct iio_chan_spec *chan) +{ + struct ad5766_state *st = iio_priv(dev); + u32 scale; + + scale = st->dither_scale & AD5766_DITHER_SCALE_MASK(chan->channel); + + return (scale >> chan->channel * 2); +} + +static int ad5766_set_dither_scale(struct iio_dev *dev, + const struct iio_chan_spec *chan, + unsigned int scale) +{ + int ret; + struct ad5766_state *st = iio_priv(dev); + uint16_t val; + + st->dither_scale &= ~AD5766_DITHER_SCALE_MASK(chan->channel); + st->dither_scale |= (scale << (chan->channel * 2)); + + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_scale); + ret = ad5766_write(dev, AD5766_CMD_DITHER_SCALE_1, val); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_scale); + return ad5766_write(dev, AD5766_CMD_DITHER_SCALE_2, val); +} + +static const struct iio_enum ad5766_dither_scale_enum = { + .items = ad5766_dither_scales, + .num_items = ARRAY_SIZE(ad5766_dither_scales), + .set = ad5766_set_dither_scale, + .get = ad5766_get_dither_scale, +}; + +static ssize_t ad5766_read_ext(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + int ret; + struct ad5766_state *st = iio_priv(indio_dev); + + switch ((u32)private) { + case AD5766_DITHER_PWR: + return sprintf(buf, "%u\n", 0x01 & + ~(st->dither_power_ctrl >> chan->channel)); + break; + case AD5766_DITHER_INVERT: + return sprintf(buf, "%u\n", 0x01 & + (st->dither_invert >> chan->channel)); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static ssize_t ad5766_write_ext(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + bool readin; + int ret; + struct ad5766_state *st = iio_priv(indio_dev); + + ret = kstrtobool(buf, &readin); + if (ret) + return ret; + + switch ((u32)private) { + case AD5766_DITHER_PWR: + ret = kstrtobool(buf, &readin); + if (ret) + break; + readin = !readin; + st->dither_power_ctrl = (st->dither_power_ctrl & + ~BIT(chan->channel)) | + (readin << chan->channel); + ret = ad5766_write(indio_dev, AD5766_CMD_WR_PWR_DITHER, + st->dither_power_ctrl); + break; + case AD5766_DITHER_INVERT: + st->dither_invert = (st->dither_invert & + ~BIT(chan->channel)) | + (readin << chan->channel); + ret = ad5766_write(indio_dev, AD5766_CMD_INV_DITHER, + st->dither_power_ctrl); + break; + default: + ret = -EINVAL; + break; + } + + return ret ? ret : len; +} + +#define _AD5766_CHAN_EXT_INFO(_name, _what, _shared) { \ + .name = _name, \ + .read = ad5766_read_ext, \ + .write = ad5766_write_ext, \ + .private = _what, \ + .shared = _shared, \ +} + +#define IIO_ENUM_AVAILABLE_SHARED(_name, _shared, _e) \ +{ \ + .name = (_name "_available"), \ + .shared = _shared, \ + .read = iio_enum_available_read, \ + .private = (uintptr_t)(_e), \ +} + +static const struct iio_chan_spec_ext_info ad5766_ext_info[] = { + + _AD5766_CHAN_EXT_INFO("dither_pwr", AD5766_DITHER_PWR, IIO_SEPARATE), + _AD5766_CHAN_EXT_INFO("dither_invert", AD5766_DITHER_INVERT, + IIO_SEPARATE), + IIO_ENUM("dither_source", IIO_SEPARATE, &ad5766_dither_source_enum), + IIO_ENUM_AVAILABLE_SHARED("dither_source", + IIO_SEPARATE, + &ad5766_dither_source_enum), + IIO_ENUM("dither_scale", IIO_SEPARATE, &ad5766_dither_scale_enum), + IIO_ENUM_AVAILABLE_SHARED("dither_scale", + IIO_SEPARATE, + &ad5766_dither_scale_enum), + {} +}; + +#define AD576x_CHANNEL(_chan, _bits) { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .output = 1, \ + .channel = (_chan), \ + .address = (_chan), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type_available = \ + BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = (_bits), \ + .storagebits = 16, \ + .shift = 16 - (_bits), \ + }, \ + .ext_info = ad5766_ext_info, \ +} + +#define DECLARE_AD576x_CHANNELS(_name, _bits) \ +const struct iio_chan_spec _name[] = { \ + AD576x_CHANNEL(0, (_bits)), \ + AD576x_CHANNEL(1, (_bits)), \ + AD576x_CHANNEL(2, (_bits)), \ + AD576x_CHANNEL(3, (_bits)), \ + AD576x_CHANNEL(4, (_bits)), \ + AD576x_CHANNEL(5, (_bits)), \ + AD576x_CHANNEL(6, (_bits)), \ + AD576x_CHANNEL(7, (_bits)), \ + AD576x_CHANNEL(8, (_bits)), \ + AD576x_CHANNEL(9, (_bits)), \ + AD576x_CHANNEL(10, (_bits)), \ + AD576x_CHANNEL(11, (_bits)), \ + AD576x_CHANNEL(12, (_bits)), \ + AD576x_CHANNEL(13, (_bits)), \ + AD576x_CHANNEL(14, (_bits)), \ + AD576x_CHANNEL(15, (_bits)), \ +} + +static DECLARE_AD576x_CHANNELS(ad5766_channels, 16); +static DECLARE_AD576x_CHANNELS(ad5767_channels, 12); + +static const struct ad5766_chip_info ad5766_chip_infos[] = { + [ID_AD5766] = { + .num_channels = ARRAY_SIZE(ad5766_channels), + .channels = ad5766_channels, + }, + [ID_AD5767] = { + .num_channels = ARRAY_SIZE(ad5767_channels), + .channels = ad5767_channels, + }, +}; + +static void ad5766_init_scale_tables(struct ad5766_state *st) +{ + int i; + s32 denom; + s64 offset; + u64 scale; + u8 realbits = st->chip_info->channels[0].scan_type.realbits; + + for (i = 0; i < AD5766_VOLTAGE_RANGE_MAX; i++) { + offset = (1 << realbits) * ad5766_span_tbl[i].min; + denom = ad5766_span_tbl[i].max - ad5766_span_tbl[i].min; + offset = div_s64(offset * 1000000, denom); + st->offset_avail[i][0] = div_s64(offset, 1000000); + div_s64_rem(offset, 1000000, &st->offset_avail[i][1]); + + scale = ad5766_span_tbl[i].max - ad5766_span_tbl[i].min; + scale = div_u64((scale * 1000000000), (1 << realbits)); + st->scale_avail[i][0] = (int)div_u64(scale, 1000000); + div_s64_rem(scale, 1000000, &st->scale_avail[i][1]); + } +} + +static int ad5766_probe(struct spi_device *spi) +{ + enum ad5766_type type; + struct iio_dev *indio_dev; + struct ad5766_state *st; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + mutex_init(&st->lock); + + st->spi = spi; + type = spi_get_device_id(spi)->driver_data; + st->chip_info = &ad5766_chip_infos[type]; + + indio_dev->channels = st->chip_info->channels; + indio_dev->num_channels = st->chip_info->num_channels; + indio_dev->info = &ad5766_info; + indio_dev->dev.parent = &spi->dev; + indio_dev->dev.of_node = spi->dev.of_node; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + + st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset", + GPIOD_OUT_HIGH); + + ad5766_init_scale_tables(st); + + ret = ad5766_default_setup(st, AD5766_VOLTAGE_RANGE_M5V_to_5V); + if (ret) + return ret; + + return devm_iio_device_register(&spi->dev, indio_dev); +} + +static const struct of_device_id ad5766_dt_match[] = { + { .compatible = "adi,ad5766" }, + { .compatible = "adi,ad5767" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ad5766_dt_match); + +static const struct spi_device_id ad5766_spi_ids[] = { + { "ad5766", ID_AD5766 }, + { "ad5767", ID_AD5767 }, + {} +}; +MODULE_DEVICE_TABLE(spi, ad5766_spi_ids); + +static struct spi_driver ad5766_driver = { + .driver = { + .name = "ad5766", + .of_match_table = ad5766_dt_match, + }, + .probe = ad5766_probe, + .id_table = ad5766_spi_ids, +}; +module_spi_driver(ad5766_driver); + +MODULE_AUTHOR("Denis-Gabriel Gheorghescu "); +MODULE_DESCRIPTION("Analog Devices AD5766/AD5767 DACs"); +MODULE_LICENSE("GPL v2");