From patchwork Mon Nov 23 14:50:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Pop X-Patchwork-Id: 11925511 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,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 746D0C2D0E4 for ; Mon, 23 Nov 2020 14:46:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 163902075A for ; Mon, 23 Nov 2020 14:46:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728463AbgKWOpo (ORCPT ); Mon, 23 Nov 2020 09:45:44 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:56342 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728493AbgKWOpn (ORCPT ); Mon, 23 Nov 2020 09:45:43 -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 0ANEefkr014241; Mon, 23 Nov 2020 09:45:41 -0500 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com with ESMTP id 34y08uw2hc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 23 Nov 2020 09:45:41 -0500 Received: from ASHBMBX8.ad.analog.com (ASHBMBX8.ad.analog.com [10.64.17.5]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 0ANEjdF5065267 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Mon, 23 Nov 2020 09:45:39 -0500 Received: from ASHBCASHYB5.ad.analog.com (10.64.17.133) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Mon, 23 Nov 2020 09:45:38 -0500 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBCASHYB5.ad.analog.com (10.64.17.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Mon, 23 Nov 2020 09:45:38 -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 15.1.1779.2 via Frontend Transport; Mon, 23 Nov 2020 09:45:38 -0500 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 0ANEjZLA024630; Mon, 23 Nov 2020 09:45:36 -0500 From: Cristian Pop To: , CC: , , , Cristian Pop Subject: [PATCH 1/2] dt-bindings: iio: dac: AD5766 yaml documentation Date: Mon, 23 Nov 2020 16:50:41 +0200 Message-ID: <20201123145042.18930-1-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=2.50.10434:6.0.312,18.0.737 definitions=2020-11-23_11:2020-11-23,2020-11-23 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 adultscore=0 mlxlogscore=999 clxscore=1011 priorityscore=1501 impostorscore=0 suspectscore=0 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011230101 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 --- .../bindings/iio/dac/adi,ad5766.yaml | 52 +++++++++++++++++++ 1 file changed, 52 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..aed4a0472bc4 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml @@ -0,0 +1,52 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2020 Analog Devices Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/bindings/iio/dac/adi,ad5766.yaml# +$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 + +examples: + - | + ad5766@0{ + compatible = "adi,ad5766"; + reg = <0>; + spi-cpol; + spi-max-frequency = <1000000>; + reset-gpios = <&gpio 22 0>; + }; From patchwork Mon Nov 23 14:50:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Pop X-Patchwork-Id: 11925513 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,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 1C1A3C64E69 for ; Mon, 23 Nov 2020 14:46:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E5FA920782 for ; Mon, 23 Nov 2020 14:46:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728493AbgKWOpr (ORCPT ); Mon, 23 Nov 2020 09:45:47 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:60012 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728655AbgKWOpr (ORCPT ); Mon, 23 Nov 2020 09:45:47 -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 0ANEeoln014470; Mon, 23 Nov 2020 09:45:44 -0500 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 34y08uw2hf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 23 Nov 2020 09:45:43 -0500 Received: from SCSQMBX11.ad.analog.com (SCSQMBX11.ad.analog.com [10.77.17.10]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 0ANEjfjh049625 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Mon, 23 Nov 2020 09:45:42 -0500 Received: from SCSQMBX11.ad.analog.com (10.77.17.10) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Mon, 23 Nov 2020 06:45:40 -0800 Received: from zeus.spd.analog.com (10.66.68.11) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Mon, 23 Nov 2020 06:45:40 -0800 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 0ANEjZLB024630; Mon, 23 Nov 2020 09:45:37 -0500 From: Cristian Pop To: , CC: , , , Cristian Pop Subject: [PATCH 2/2] iio: dac: ad5766: add driver support for AD5766 Date: Mon, 23 Nov 2020 16:50:42 +0200 Message-ID: <20201123145042.18930-2-cristian.pop@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201123145042.18930-1-cristian.pop@analog.com> References: <20201123145042.18930-1-cristian.pop@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-23_11:2020-11-23,2020-11-23 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 priorityscore=1501 impostorscore=0 suspectscore=0 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011230101 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 --- drivers/iio/dac/ad5766.c | 768 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 768 insertions(+) create mode 100644 drivers/iio/dac/ad5766.c diff --git a/drivers/iio/dac/ad5766.c b/drivers/iio/dac/ad5766.c new file mode 100644 index 000000000000..feef78960990 --- /dev/null +++ b/drivers/iio/dac/ad5766.c @@ -0,0 +1,768 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices AD5766, AD5767 + * Digital to Analog Converters driver + * + * Copyright 2019 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include + +#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, +}; + +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); +static ssize_t ad5766_read_ext(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf); + +static int ad5766_get_dither_source(struct iio_dev *dev, + const struct iio_chan_spec *chan); + +static int ad5766_set_dither_source(struct iio_dev *dev, + const struct iio_chan_spec *chan, + unsigned int mode); + +static int ad5766_get_dither_scale(struct iio_dev *dev, + const struct iio_chan_spec *chan); + +static int ad5766_set_dither_scale(struct iio_dev *dev, + const struct iio_chan_spec *chan, + unsigned int mode); + +#define _AD5766_CHAN_EXT_INFO(_name, _what, _shared) { \ + .name = _name, \ + .read = ad5766_read_ext, \ + .write = ad5766_write_ext, \ + .private = _what, \ + .shared = _shared, \ +} + +enum { + AD5766_DITHER_PWR, + AD5766_DITHER_INVERT +}; + +static const char * const ad5766_dither_sources[] = { + "NO_DITHER", + "N0", + "N1", +}; + +static const char * const ad5766_dither_scales[] = { + "NO_SCALING", + "75%_SCALING", + "50%_SCALING", + "25%_SCALING", +}; + +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 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 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)), \ +} + +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; +}; + +/** + * struct ad5766_state - driver instance specific data + * @spi: Spi device + * @lock: Mutex lock + * @chip_info: Chip model specific constants + * @gpio_reset: Reset gpio + * @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: No dither, N0, N1 + * @dither_source: Selects between 4 possible sources: + * No scale, 75%, 50%, 25% + * @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; + s32 scale_avail[AD5766_VOLTAGE_RANGE_MAX][2]; + s32 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_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long info); + +static int ad5766_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m); + +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); + +static const struct iio_info ad5766_info = { + .read_raw = ad5766_read_raw, + .write_raw = ad5766_write_raw, + .read_avail = ad5766_read_avail, +}; + +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 int _ad5766_spi_write(struct ad5766_state *st, + u8 command, + u16 data) +{ + st->data[0].b8[0] = command; + st->data[0].b8[1] = (data & 0xFF00) >> 8; + st->data[0].b8[2] = (data & 0x00FF) >> 0; + + return spi_write(st->spi, &st->data[0].b8[0], 3); +} + +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 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_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; + + /* 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; + ret = _ad5766_spi_write(st, AD5766_CMD_DITHER_SIG_1, + st->dither_source & 0xFFFF); + if (ret) + return ret; + + ret = _ad5766_spi_write(st, AD5766_CMD_DITHER_SIG_2, + (st->dither_source >> 16) & 0xFFFF); + if (ret) + return ret; + + st->dither_scale = 0; + ret = _ad5766_spi_write(st, AD5766_CMD_DITHER_SCALE_1, + st->dither_scale & 0xFFFF); + if (ret) + return ret; + + ret = _ad5766_spi_write(st, AD5766_CMD_DITHER_SCALE_2, + (st->dither_scale >> 16) & 0xFFFF); + 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_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); + const int max_val = (1 << chan->scan_type.realbits); + + switch (info) { + case IIO_CHAN_INFO_RAW: + 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 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_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 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; +} + +static int ad5766_get_dither_source(struct iio_dev *dev, + const struct iio_chan_spec *chan) +{ + struct ad5766_state *st = iio_priv(dev); + + return (st->dither_source >> (chan->channel * 2) & 0x03); +} + +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); + + st->dither_source = (st->dither_source & ~(0x03 << (chan->channel * 2))) + | (mode << (chan->channel * 2)); + + ret = ad5766_write(dev, AD5766_CMD_DITHER_SIG_1, + st->dither_source & 0xFFFF); + if (ret) + return ret; + + return ad5766_write(dev, AD5766_CMD_DITHER_SIG_2, + (st->dither_source >> 16) & 0xFFFF); +} + +static int ad5766_get_dither_scale(struct iio_dev *dev, + const struct iio_chan_spec *chan) +{ + struct ad5766_state *st = iio_priv(dev); + + return (st->dither_scale >> (chan->channel * 2) & 0x03); +} + +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); + + st->dither_scale = (st->dither_scale & ~(0x03 << (chan->channel * 2))) + | (scale << (chan->channel * 2)); + + ret = ad5766_write(dev, AD5766_CMD_DITHER_SCALE_1, + st->dither_scale & 0xFFFF); + if (ret) + return ret; + + return ad5766_write(dev, AD5766_CMD_DITHER_SCALE_2, + (st->dither_scale >> 16) & 0xFFFF); +} + +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 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 = (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 = (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_probe(struct spi_device *spi) +{ + enum ad5766_type type = spi_get_device_id(spi)->driver_data; + 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); + spi_set_drvdata(spi, indio_dev); + + mutex_init(&st->lock); + + st->spi = spi; + 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");