From patchwork Thu Nov 16 13:46:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dumitru Ceclan X-Patchwork-Id: 744490 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IylrlW6v" Received: from mail-ed1-x533.google.com (mail-ed1-x533.google.com [IPv6:2a00:1450:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5EA5B1A7; Thu, 16 Nov 2023 05:47:09 -0800 (PST) Received: by mail-ed1-x533.google.com with SMTP id 4fb4d7f45d1cf-54366784377so1181009a12.3; Thu, 16 Nov 2023 05:47:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1700142428; x=1700747228; 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=L9n2xlD0wmj6Y3GfFvYUtUVU7W4PyowozgTvXhqljkM=; b=IylrlW6v7DtHvv7OvjDDvV/34m1TvSKNsxfJlnIXppOaGctf43CpxKxrz87DibILKl v+2EFhusJnR537eC4PoQeZ1Nbm3CnxK/9EIptImzUuCAiF0rk4P9ZMkpkVCt633nbw5O oS7XVZnP7nPJ7ckeYzowim5LCe4HlPZRFtBpqvSJ3EX6gKBemAOXkOzzoJQMjYVJZTVw rHX0fVZPdAOihhO/yNyOWDOURRD3f0+2X+LJ1fmp6xVeXftGef3WgO/k4yUkeU9iltHL HsoMATyIgrwDmmS/IkiVPzgPnXByzFsXwyhxbaG88gBRWf0m5sayJ3SEsX0LlkQMqqLf ZDgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700142428; x=1700747228; 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=L9n2xlD0wmj6Y3GfFvYUtUVU7W4PyowozgTvXhqljkM=; b=RcvDbeC9Kpy+fYwETLtBQPVArRXqFPbyFECkXTEOn2wOLB8eUIjoD+4bWMrEunEleV ZXOZB19PmBl2wv+stcwOAhsE1mZ/jlg+AJ6ixrp8RKmb0663vNubmAjeNNmDGHwvfyS/ hk38aXVGKcC3Q2kNlJIqFBKFFVofu7LA7FmMJ++dMq8c79L32eDsla0Er4KqCJmC8zIN ih2aJpHMHFr6QPPP7Jqkl+yvOkbd1FpUryJy951GJndBse9qLk+nO5bECv1qhZqgqwvh QtENUlpsZjF2D1bBBSUsiaMvfj1HqFXX+8/7UnavgyJcpo8pbetLqqN6qRvne3TI+As7 wO0A== X-Gm-Message-State: AOJu0YzxMSk7b9lUDNd79M48rVjWZNw+8SbpyJusdsnJj/GbGK3RA9Vr IVNdwTIqCI2Bxr2yf4s/hH8= X-Google-Smtp-Source: AGHT+IGiNTqEu8LaJx4ixCV09z6qAw39EYMaRL3aIgaMsO2r0lxNZZbqRdUlQ+Qy+6sZX2wqPiTsCg== X-Received: by 2002:a17:907:97c9:b0:9dc:2291:d384 with SMTP id js9-20020a17090797c900b009dc2291d384mr14436665ejc.22.1700142427367; Thu, 16 Nov 2023 05:47:07 -0800 (PST) Received: from HYB-hhAwRlzzMZb.ad.analog.com ([5.2.194.157]) by smtp.gmail.com with ESMTPSA id ov3-20020a170906fc0300b00977cad140a8sm8467005ejb.218.2023.11.16.05.47.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Nov 2023 05:47:07 -0800 (PST) From: mitrutzceclan X-Google-Original-From: mitrutzceclan To: Cc: linus.walleij@linaro.org, brgl@bgdev.pl, andy@kernel.org, linux-gpio@vger.kernel.org, Lars-Peter Clausen , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Walle , Andy Shevchenko , Arnd Bergmann , ChiaEn Wu , Niklas Schnelle , =?utf-8?q?Leonard_G=C3=B6hrs?= , Mike Looijmans , Haibo Chen , Hugo Villeneuve , Ceclan Dumitru , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Dumitru Ceclan Subject: [PATCH v4 2/2] iio: adc: ad7173: add AD7173 driver Date: Thu, 16 Nov 2023 15:46:55 +0200 Message-ID: <20231116134655.21052-2-user@HYB-hhAwRlzzMZb> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231116134655.21052-1-user@HYB-hhAwRlzzMZb> References: <20231116134655.21052-1-user@HYB-hhAwRlzzMZb> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Dumitru Ceclan The AD7173 family offer a complete integrated Sigma-Delta ADC solution which can be used in high precision, low noise single channel applications or higher speed multiplexed applications. The Sigma-Delta ADC is intended primarily for measurement of signals close to DC but also delivers outstanding performance with input bandwidths out to ~10kHz. Reviewed-by: Michael Walle # for gpio-regmap Signed-off-by: Dumitru Ceclan --- V3 -> V4 - cleaned up includes - add ad7173_gpio_disable(), include to devm actions - remove iio_device_claim_direct_mode() from update_scan_mode() - always set differential iio_chan attribute to true, retain bipolar info only in private struct - store multiple regulators in state for voltage references - compute read_raw offset depending on channel used reference - configure channel setup using selected reference - add ad7173_get_ref_voltage_milli() - clean up ad7173_fw_sparse_channel_config() changing array access of channel structs to pointers - retain chip name in st->info structure - use spi_device_get_match_data() in probe drivers/iio/adc/Kconfig | 13 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad7173.c | 936 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 950 insertions(+) create mode 100644 drivers/iio/adc/ad7173.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 35f9867da12c..c0d522ef1db5 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -54,6 +54,19 @@ config AD7124 To compile this driver as a module, choose M here: the module will be called ad7124. +config AD7173 + tristate "Analog Devices AD7173 driver" + depends on SPI_MASTER + select AD_SIGMA_DELTA + select GPIO_REGMAP if GPIOLIB + select REGMAP_SPI if GPIOLIB + help + Say yes here to build support for Analog Devices AD7173 and similar ADC + (currently supported: AD7172-2, AD7173-8, AD7175-2, AD7176-2). + + To compile this driver as a module, choose M here: the module will be + called ad7173. + config AD7192 tristate "Analog Devices AD7190 AD7192 AD7193 AD7195 ADC driver" depends on SPI diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index bee11d442af4..9f1f8f263340 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o obj-$(CONFIG_AD4130) += ad4130.o obj-$(CONFIG_AD7091R5) += ad7091r5.o ad7091r-base.o obj-$(CONFIG_AD7124) += ad7124.o +obj-$(CONFIG_AD7173) += ad7173.o obj-$(CONFIG_AD7192) += ad7192.o obj-$(CONFIG_AD7266) += ad7266.o obj-$(CONFIG_AD7280) += ad7280a.o diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c new file mode 100644 index 000000000000..cbd3ba7ceab8 --- /dev/null +++ b/drivers/iio/adc/ad7173.c @@ -0,0 +1,936 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * AD7172-2/AD7173-8/AD7175-2/AD7176-2 SPI ADC driver + * Copyright (C) 2015, 2023 Analog Devices, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include + +#define AD7173_REG_COMMS 0x00 +#define AD7173_REG_ADC_MODE 0x01 +#define AD7173_REG_INTERFACE_MODE 0x02 +#define AD7173_REG_CRC 0x03 +#define AD7173_REG_DATA 0x04 +#define AD7173_REG_GPIO 0x06 +#define AD7173_REG_ID 0x07 +#define AD7173_REG_CH(x) (0x10 + (x)) +#define AD7173_REG_SETUP(x) (0x20 + (x)) +#define AD7173_REG_FILTER(x) (0x28 + (x)) +#define AD7173_REG_OFFSET(x) (0x30 + (x)) +#define AD7173_REG_GAIN(x) (0x38 + (x)) + +#define AD7173_RESET_LENGTH BITS_TO_BYTES(64) + +#define AD7173_CH_ENABLE BIT(15) +#define AD7173_CH_SETUP_SEL_MASK GENMASK(14, 12) +#define AD7173_CH_SETUP_AINPOS_MASK GENMASK(9, 5) +#define AD7173_CH_SETUP_AINNEG_MASK GENMASK(4, 0) + +#define AD7173_CH_ADDRESS(pos, neg) \ + (FIELD_PREP(AD7173_CH_SETUP_AINPOS_MASK, pos) |\ + FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg)) +#define AD7173_AIN_TEMP_POS 17 +#define AD7173_AIN_TEMP_NEG 18 + +#define AD7172_ID 0x00d0 +#define AD7173_ID 0x30d0 +#define AD7175_ID 0x0cd0 +#define AD7176_ID 0x0c90 +#define AD7173_ID_MASK GENMASK(15, 4) + +#define AD7173_ADC_MODE_REF_EN BIT(15) +#define AD7173_ADC_MODE_SING_CYC BIT(13) +#define AD7173_ADC_MODE_MODE_MASK GENMASK(6, 4) +#define AD7173_ADC_MODE_CLOCKSEL_MASK GENMASK(3, 2) + +#define AD7173_GPIO_PDSW BIT(14) +#define AD7173_GPIO_OP_EN2_3 BIT(13) +#define AD7173_GPIO_MUX_IO BIT(12) +#define AD7173_GPIO_SYNC_EN BIT(11) +#define AD7173_GPIO_ERR_EN BIT(10) +#define AD7173_GPIO_ERR_DAT BIT(9) +#define AD7173_GPIO_GP_DATA3 BIT(7) +#define AD7173_GPIO_GP_DATA2 BIT(6) +#define AD7173_GPIO_IP_EN1 BIT(5) +#define AD7173_GPIO_IP_EN0 BIT(4) +#define AD7173_GPIO_OP_EN1 BIT(3) +#define AD7173_GPIO_OP_EN0 BIT(2) +#define AD7173_GPIO_GP_DATA1 BIT(1) +#define AD7173_GPIO_GP_DATA0 BIT(0) + +#define AD7173_GPO12_DATA(x) BIT(x) +#define AD7173_GPO23_DATA(x) BIT(x + 4) +#define AD7173_GPO_DATA(x) (x < 2 ? AD7173_GPO12_DATA(x) : AD7173_GPO23_DATA(x)) + +#define AD7173_INTERFACE_DATA_STAT BIT(6) +#define AD7173_INTERFACE_DATA_STAT_EN(x)\ + FIELD_PREP(AD7173_INTERFACE_DATA_STAT, x) + +#define AD7173_SETUP_BIPOLAR BIT(12) +#define AD7173_SETUP_AREF_BUF_MASK GENMASK(11, 10) +#define AD7173_SETUP_AIN_BUF_MASK GENMASK(9, 8) + +#define AD7173_SETUP_REF_SEL_MASK GENMASK(5, 4) +#define AD7173_SETUP_REF_SEL_AVDD1_AVSS 0x3 +#define AD7173_SETUP_REF_SEL_INT_REF 0x2 +#define AD7173_SETUP_REF_SEL_EXT_REF2 0x1 +#define AD7173_SETUP_REF_SEL_EXT_REF 0x0 +#define AD7173_VOLTAGE_INT_REF_MICROV 2500000 + +#define AD7173_FILTER_ODR0_MASK GENMASK(5, 0) +#define AD7173_MAX_CONFIGS 8 + +enum ad7173_ids { + ID_AD7172_2, + ID_AD7173_8, + ID_AD7175_2, + ID_AD7176_2, +}; + +struct ad7173_device_info { + char *name; + unsigned int id; + unsigned int num_inputs; + unsigned int num_configs; + unsigned int num_channels; + unsigned char num_gpios; + bool has_temp; + unsigned int clock; + + const unsigned int *sinc5_data_rates; + unsigned int num_sinc5_data_rates; +}; + +struct ad7173_channel_config { + bool live; + u8 cfg_slot; + /* Following fields are used to compare equality. Bipolar must be first */ + bool bipolar; + bool input_buf; + u8 odr; + u8 ref_sel; +}; + +struct ad7173_channel { + unsigned int chan_reg; + unsigned int ain; + struct ad7173_channel_config cfg; +}; + +struct ad7173_state { + const struct ad7173_device_info *info; + struct ad_sigma_delta sd; + struct ad7173_channel *channels; + struct regulator_bulk_data regulators[3]; + unsigned int adc_mode; + unsigned int interface_mode; + unsigned int num_channels; + DECLARE_BITMAP(cfg_slots_status, AD7173_MAX_CONFIGS); /* slots usage status */ + unsigned long long config_usage_counter; + unsigned long long *config_cnts; +#if IS_ENABLED(CONFIG_GPIOLIB) + struct regmap *reg_gpiocon_regmap; + struct gpio_regmap *gpio_regmap; +#endif +}; + +static const unsigned int ad7173_sinc5_data_rates[] = { + 6211000, 6211000, 6211000, 6211000, 6211000, 6211000, 5181000, 4444000, + 3115000, 2597000, 1007000, 503800, 381000, 200300, 100500, 59520, + 49680, 20010, 16333, 10000, 5000, 2500, 1250, +}; + +static const unsigned int ad7175_sinc5_data_rates[] = { + 50000000, 41667000, 31250000, 27778000, 20833000, 17857000, 12500000, + 10000000, 5000000, 2500000, 1000000, 500000, 397500, 200000, + 100000, 59920, 49960, 20000, 16666, 10000, 5000, +}; + +static const struct ad7173_device_info ad7173_device_info[] = { + [ID_AD7172_2] = { + .name = "ad7172-2", + .id = AD7172_ID, + .num_inputs = 5, + .num_channels = 4, + .num_configs = 4, + .num_gpios = 2, + .has_temp = true, + .clock = 2 * HZ_PER_MHZ, + .sinc5_data_rates = ad7173_sinc5_data_rates, + .num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates), + }, + [ID_AD7173_8] = { + .name = "ad7173-8", + .id = AD7173_ID, + .num_inputs = 17, + .num_channels = 16, + .num_configs = 8, + .num_gpios = 4, + .has_temp = true, + .clock = 2 * HZ_PER_MHZ, + .sinc5_data_rates = ad7173_sinc5_data_rates, + .num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates), + }, + [ID_AD7175_2] = { + .name = "ad7175-2", + .id = AD7175_ID, + .num_inputs = 5, + .num_channels = 4, + .num_configs = 4, + .num_gpios = 2, + .has_temp = true, + .clock = 16 * HZ_PER_MHZ, + .sinc5_data_rates = ad7175_sinc5_data_rates, + .num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates), + }, + [ID_AD7176_2] = { + .name = "ad7176-2", + .id = AD7176_ID, + .num_inputs = 5, + .num_channels = 4, + .num_configs = 4, + .num_gpios = 2, + .has_temp = false, + .clock = 16 * HZ_PER_MHZ, + .sinc5_data_rates = ad7175_sinc5_data_rates, + .num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates), + }, +}; + +#if IS_ENABLED(CONFIG_GPIOLIB) + +static const struct regmap_range ad7173_range_gpio[] = { + regmap_reg_range(AD7173_REG_GPIO, AD7173_REG_GPIO), +}; + +static const struct regmap_access_table ad7173_access_table = { + .yes_ranges = ad7173_range_gpio, + .n_yes_ranges = ARRAY_SIZE(ad7173_range_gpio), +}; + +static const struct regmap_config ad7173_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .rd_table = &ad7173_access_table, + .wr_table = &ad7173_access_table, + .read_flag_mask = BIT(6), +}; + +static int ad7173_mask_xlate(struct gpio_regmap *gpio, unsigned int base, + unsigned int offset, unsigned int *reg, + unsigned int *mask) +{ + *mask = AD7173_GPO_DATA(offset); + *reg = base; + return 0; +} + +static void ad7173_gpio_disable(void *data) +{ + struct ad7173_state *st = data; + unsigned int mask; + + mask = AD7173_GPIO_OP_EN0 | AD7173_GPIO_OP_EN1 | AD7173_GPIO_OP_EN2_3; + regmap_update_bits(st->reg_gpiocon_regmap, AD7173_REG_GPIO, mask, ~mask); +} + +static int ad7173_gpio_init(struct ad7173_state *st) +{ + struct gpio_regmap_config gpio_regmap = {}; + struct device *dev = &st->sd.spi->dev; + unsigned int mask; + int ret; + + st->reg_gpiocon_regmap = devm_regmap_init_spi(st->sd.spi, &ad7173_regmap_config); + if (IS_ERR(st->reg_gpiocon_regmap)) { + return dev_err_probe(dev, PTR_ERR(st->reg_gpiocon_regmap), + "Unable to init regmap\n"); + } + + mask = AD7173_GPIO_OP_EN0 | AD7173_GPIO_OP_EN1 | AD7173_GPIO_OP_EN2_3; + regmap_update_bits(st->reg_gpiocon_regmap, AD7173_REG_GPIO, mask, mask); + + ret = devm_add_action_or_reset(dev, ad7173_gpio_disable, st); + if (ret) + return ret; + + gpio_regmap.parent = dev; + gpio_regmap.regmap = st->reg_gpiocon_regmap; + gpio_regmap.ngpio = st->info->num_gpios; + gpio_regmap.reg_set_base = AD7173_REG_GPIO; + gpio_regmap.reg_mask_xlate = ad7173_mask_xlate; + + st->gpio_regmap = devm_gpio_regmap_register(dev, &gpio_regmap); + if (IS_ERR(st->gpio_regmap)) { + return dev_err_probe(dev, PTR_ERR(st->gpio_regmap), + "Unable to init gpio-regmap\n"); + } + + return 0; +} + +#endif /* CONFIG_GPIOLIB */ + +static struct ad7173_state *ad_sigma_delta_to_ad7173(struct ad_sigma_delta *sd) +{ + return container_of(sd, struct ad7173_state, sd); +} + +static void ad7173_reset_usage_cnts(struct ad7173_state *st) +{ + memset64(st->config_cnts, 0, st->info->num_configs); + st->config_usage_counter = 0; +} + +static struct ad7173_channel_config *ad7173_find_live_config + (struct ad7173_state *st, struct ad7173_channel_config *cfg) +{ + struct ad7173_channel_config *cfg_aux; + ptrdiff_t cmp_size, offset; + int i; + + offset = offsetof(struct ad7173_channel_config, cfg_slot) + + sizeof(cfg->cfg_slot); + cmp_size = sizeof(*cfg) - offset; + + for (i = 0; i < st->num_channels; i++) { + cfg_aux = &st->channels[i].cfg; + + if (cfg_aux->live && !memcmp(&cfg->bipolar, &cfg_aux->bipolar, + cmp_size)) + return cfg_aux; + } + return NULL; +} + +static int ad7173_free_config_slot_lru(struct ad7173_state *st) +{ + int i, lru_position = 0; + + for (i = 1; i < st->info->num_configs; i++) + if (st->config_cnts[i] < st->config_cnts[lru_position]) + lru_position = i; + + for (i = 0; i < st->num_channels; i++) + if (st->channels[i].cfg.cfg_slot == lru_position) + st->channels[i].cfg.live = false; + + clear_bit(lru_position, st->cfg_slots_status); + return lru_position; +} + +static int ad7173_load_config(struct ad7173_state *st, + struct ad7173_channel_config *cfg) +{ + unsigned int config; + int free_cfg_slot, ret; + + free_cfg_slot = find_first_zero_bit(st->cfg_slots_status, + st->info->num_configs); + if (free_cfg_slot == st->info->num_configs) + free_cfg_slot = ad7173_free_config_slot_lru(st); + + set_bit(free_cfg_slot, st->cfg_slots_status); + cfg->cfg_slot = free_cfg_slot; + + config = FIELD_PREP(AD7173_SETUP_REF_SEL_MASK, cfg->ref_sel); + + if (cfg->bipolar) + config |= AD7173_SETUP_BIPOLAR; + + if (cfg->input_buf) + config |= AD7173_SETUP_AIN_BUF_MASK; + + ret = ad_sd_write_reg(&st->sd, AD7173_REG_SETUP(free_cfg_slot), 2, config); + if (ret) + return ret; + + return ad_sd_write_reg(&st->sd, AD7173_REG_FILTER(free_cfg_slot), 2, + AD7173_FILTER_ODR0_MASK & cfg->odr); +} + +static int ad7173_config_channel(struct ad7173_state *st, int addr) +{ + struct ad7173_channel_config *cfg = &st->channels[addr].cfg; + struct ad7173_channel_config *live_cfg; + int ret; + + if (!cfg->live) { + live_cfg = ad7173_find_live_config(st, cfg); + if (live_cfg) { + cfg->cfg_slot = live_cfg->cfg_slot; + } else { + ret = ad7173_load_config(st, cfg); + if (ret) + return ret; + cfg->live = true; + } + } + + if (st->config_usage_counter == U64_MAX) + ad7173_reset_usage_cnts(st); + + st->config_usage_counter++; + st->config_cnts[cfg->cfg_slot] = st->config_usage_counter; + + return 0; +} + +static int ad7173_set_channel(struct ad_sigma_delta *sd, unsigned int channel) +{ + struct ad7173_state *st = ad_sigma_delta_to_ad7173(sd); + unsigned int val; + int ret; + + ret = ad7173_config_channel(st, channel); + if (ret) + return ret; + + val = AD7173_CH_ENABLE | + FIELD_PREP(AD7173_CH_SETUP_SEL_MASK, st->channels[channel].cfg.cfg_slot) | + st->channels[channel].ain; + + return ad_sd_write_reg(&st->sd, AD7173_REG_CH(channel), 2, val); +} + +static int ad7173_set_mode(struct ad_sigma_delta *sd, + enum ad_sigma_delta_mode mode) +{ + struct ad7173_state *st = ad_sigma_delta_to_ad7173(sd); + + st->adc_mode &= ~AD7173_ADC_MODE_MODE_MASK; + st->adc_mode |= FIELD_PREP(AD7173_ADC_MODE_MODE_MASK, mode); + + return ad_sd_write_reg(&st->sd, AD7173_REG_ADC_MODE, 2, st->adc_mode); +} + +static int ad7173_append_status(struct ad_sigma_delta *sd, bool append) +{ + struct ad7173_state *st = ad_sigma_delta_to_ad7173(sd); + unsigned int interface_mode = st->interface_mode; + int ret; + + interface_mode |= AD7173_INTERFACE_DATA_STAT_EN(append); + ret = ad_sd_write_reg(&st->sd, AD7173_REG_INTERFACE_MODE, 2, interface_mode); + if (ret) + return ret; + + st->interface_mode = interface_mode; + + return 0; +} + +static int ad7173_disable_all(struct ad_sigma_delta *sd) +{ + struct ad7173_state *st = ad_sigma_delta_to_ad7173(sd); + int ret; + int i; + + for (i = 0; i < st->num_channels; i++) { + ret = ad_sd_write_reg(sd, AD7173_REG_CH(i), 2, 0); + if (ret < 0) + return ret; + } + + return 0; +} + +static struct ad_sigma_delta_info ad7173_sigma_delta_info = { + .set_channel = ad7173_set_channel, + .append_status = ad7173_append_status, + .disable_all = ad7173_disable_all, + .set_mode = ad7173_set_mode, + .has_registers = true, + .addr_shift = 0, + .read_mask = BIT(6), + .status_ch_mask = GENMASK(3, 0), + .data_reg = AD7173_REG_DATA, + .irq_flags = IRQF_TRIGGER_FALLING, +}; + +static int ad7173_setup(struct iio_dev *indio_dev) +{ + struct ad7173_state *st = iio_priv(indio_dev); + unsigned int id; + u8 buf[AD7173_RESET_LENGTH]; + int ret; + + /* reset the serial interface */ + memset(buf, 0xff, AD7173_RESET_LENGTH); + ret = spi_write_then_read(st->sd.spi, buf, sizeof(buf), NULL, 0); + if (ret < 0) + return ret; + + /* datasheet recommends a delay of at least 500us after reset */ + fsleep(500); + + ret = ad_sd_read_reg(&st->sd, AD7173_REG_ID, 2, &id); + if (ret) + return ret; + + id &= AD7173_ID_MASK; + if (id != st->info->id) + dev_warn(&st->sd.spi->dev, + "Unexpected device id: %x, expected: %x\n", + id, st->info->id); + + st->adc_mode |= AD7173_ADC_MODE_SING_CYC; + st->interface_mode = 0x0; + + st->config_usage_counter = 0; + st->config_cnts = devm_kcalloc(indio_dev->dev.parent, + st->info->num_configs, sizeof(u64), + GFP_KERNEL); + if (!st->config_cnts) + return -ENOMEM; + + /* All channels are enabled by default after a reset */ + return ad7173_disable_all(&st->sd); +} + +static unsigned int ad7173_get_ref_voltage_milli(struct ad7173_state *st, + u8 reference_select) +{ + int vref; + + switch (reference_select) { + case AD7173_SETUP_REF_SEL_EXT_REF: + vref = regulator_get_voltage(st->regulators[0].consumer); + break; + + case AD7173_SETUP_REF_SEL_EXT_REF2: + vref = regulator_get_voltage(st->regulators[1].consumer); + break; + + case AD7173_SETUP_REF_SEL_INT_REF: + vref = AD7173_VOLTAGE_INT_REF_MICROV; + break; + + case AD7173_SETUP_REF_SEL_AVDD1_AVSS: + vref = regulator_get_voltage(st->regulators[2].consumer); + break; + + default: + return -EINVAL; + } + + if (vref < 0) + return vref; + + return vref / (MICRO/MILLI); +} + +static int ad7173_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long info) +{ + struct ad7173_state *st = iio_priv(indio_dev); + struct ad7173_channel *ch = &st->channels[chan->address]; + unsigned int reg; + int ret; + + switch (info) { + case IIO_CHAN_INFO_RAW: + ret = ad_sigma_delta_single_conversion(indio_dev, chan, val); + if (ret < 0) + return ret; + + /* disable channel after single conversion */ + ret = ad_sd_write_reg(&st->sd, AD7173_REG_CH(chan->address), 2, 0); + if (ret < 0) + return ret; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + if (chan->type == IIO_TEMP) { + *val = 250000000; + *val2 = 800273203; /* (2^24 * 477) / 10 */ + return IIO_VAL_FRACTIONAL; + } else { + *val = ad7173_get_ref_voltage_milli(st, ch->cfg.ref_sel); + *val2 = chan->scan_type.realbits - !!(ch->cfg.bipolar); + return IIO_VAL_FRACTIONAL_LOG2; + } + case IIO_CHAN_INFO_OFFSET: + if (chan->type == IIO_TEMP) { + *val = -874379; + } else { + if (ch->cfg.bipolar) + /* (1<<31) is UB for a 32bit channel */ + *val = (chan->scan_type.realbits == 32) ? + INT_MIN : + -(1 << (chan->scan_type.realbits - 1)); + else + *val = 0; + } + return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + reg = st->channels[chan->address].cfg.odr; + + *val = st->info->sinc5_data_rates[reg] / (MICRO/MILLI); + *val2 = (st->info->sinc5_data_rates[reg] % MILLI) * (MICRO/MILLI); + + return IIO_VAL_INT_PLUS_MICRO; + } + return -EINVAL; +} + +static int ad7173_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long info) +{ + struct ad7173_state *st = iio_priv(indio_dev); + struct ad7173_channel_config *cfg; + unsigned int freq, i, reg; + int ret; + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + switch (info) { + case IIO_CHAN_INFO_SAMP_FREQ: + freq = val * MILLI + val2 / MILLI; + + for (i = 0; i < st->info->num_sinc5_data_rates - 1; i++) { + if (freq >= st->info->sinc5_data_rates[i]) + break; + } + + cfg = &st->channels[chan->address].cfg; + cfg->odr = i; + + if (!cfg->live) + break; + + ret = ad_sd_read_reg(&st->sd, AD7173_REG_FILTER(cfg->cfg_slot), 2, ®); + if (ret) + break; + reg &= ~AD7173_FILTER_ODR0_MASK; + reg |= FIELD_PREP(AD7173_FILTER_ODR0_MASK, i); + ret = ad_sd_write_reg(&st->sd, AD7173_REG_FILTER(cfg->cfg_slot), 2, reg); + break; + + default: + ret = -EINVAL; + break; + } + + iio_device_release_direct_mode(indio_dev); + return ret; +} + +static int ad7173_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct ad7173_state *st = iio_priv(indio_dev); + int i, ret = 0; + + for (i = 0; i < indio_dev->num_channels; i++) { + if (test_bit(i, scan_mask)) + ret = ad7173_set_channel(&st->sd, i); + else + ret = ad_sd_write_reg(&st->sd, AD7173_REG_CH(i), 2, 0); + + if (ret < 0) + return ret; + } + + return ret; +} + +static int ad7173_debug(struct iio_dev *indio_dev, unsigned int reg, + unsigned int writeval, unsigned int *readval) +{ + struct ad7173_state *st = iio_priv(indio_dev); + u8 reg_size; + + if (reg == 0) + reg_size = 1; + else if (reg == AD7173_REG_CRC || reg == AD7173_REG_DATA || + reg >= AD7173_REG_OFFSET(0)) + reg_size = 3; + else + reg_size = 2; + + if (readval) + return ad_sd_read_reg(&st->sd, reg, reg_size, readval); + + return ad_sd_write_reg(&st->sd, reg, reg_size, writeval); +} + +static const struct iio_info ad7173_info = { + .read_raw = &ad7173_read_raw, + .write_raw = &ad7173_write_raw, + .debugfs_reg_access = &ad7173_debug, + .validate_trigger = ad_sd_validate_trigger, + .update_scan_mode = ad7173_update_scan_mode, +}; + +static const struct iio_chan_spec ad7173_channel_template = { + .type = IIO_VOLTAGE, + .indexed = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + .scan_type = { + .sign = 'u', + .realbits = 24, + .storagebits = 32, + .endianness = IIO_BE, + }, +}; + +static const struct iio_chan_spec ad7173_temp_iio_channel_template = { + .type = IIO_TEMP, + .indexed = 1, + .channel = AD7173_AIN_TEMP_POS, + .channel2 = AD7173_AIN_TEMP_NEG, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + .scan_type = { + .sign = 'u', + .realbits = 24, + .storagebits = 32, + .endianness = IIO_BE, + }, +}; + +static void ad7173_disable_regulators(void *data) +{ + struct ad7173_state *st = data; + + regulator_bulk_disable(ARRAY_SIZE(st->regulators), st->regulators); +} + +static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev) +{ + struct ad7173_state *st = iio_priv(indio_dev); + struct ad7173_channel *channels_st_priv_arr, *chan_st_priv; + struct fwnode_handle *child; + struct device *dev = indio_dev->dev.parent; + struct iio_chan_spec *chan_arr, *chan; + unsigned int num_channels; + unsigned int ain[2], chan_index = 0; + u32 ref_sel; + int ret; + + st->regulators[0].supply = "refin"; + st->regulators[1].supply = "refin2"; + st->regulators[2].supply = "avdd"; + + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(st->regulators), + st->regulators); + if (ret) + return dev_err_probe(dev, ret, "Failed to get regulators\n"); + + ret = regulator_bulk_enable(ARRAY_SIZE(st->regulators), st->regulators); + if (ret) + return dev_err_probe(dev, ret, "Failed to enable regulators\n"); + + ret = devm_add_action_or_reset(dev, ad7173_disable_regulators, st); + if (ret) + return dev_err_probe(dev, ret, + "Failed to add regulators disable action\n"); + + num_channels = device_get_child_node_count(dev); + + if (st->info->has_temp) + num_channels++; + + if (num_channels == 0) + return 0; + st->num_channels = num_channels; + + chan_arr = devm_kcalloc(dev, sizeof(*chan_arr), num_channels, + GFP_KERNEL); + if (!chan_arr) + return -ENOMEM; + + channels_st_priv_arr = devm_kcalloc(dev, num_channels, + sizeof(*channels_st_priv_arr), + GFP_KERNEL); + if (!channels_st_priv_arr) + return -ENOMEM; + + indio_dev->channels = chan_arr; + indio_dev->num_channels = num_channels; + st->channels = channels_st_priv_arr; + + if (st->info->has_temp) { + chan_arr[chan_index] = ad7173_temp_iio_channel_template; + chan_st_priv = &channels_st_priv_arr[chan_index]; + chan_st_priv->ain = + AD7173_CH_ADDRESS(chan_arr[chan_index].channel, chan_arr[chan_index].channel2); + chan_st_priv->cfg.bipolar = false; + chan_st_priv->cfg.input_buf = true; + chan_st_priv->cfg.ref_sel = AD7173_SETUP_REF_SEL_INT_REF; + st->adc_mode |= AD7173_ADC_MODE_REF_EN; + + chan_index++; + } + + device_for_each_child_node(dev, child) { + chan = &chan_arr[chan_index]; + chan_st_priv = &channels_st_priv_arr[chan_index]; + ret = fwnode_property_read_u32_array(child, "diff-channels", + ain, ARRAY_SIZE(ain)); + if (ret) { + fwnode_handle_put(child); + return ret; + } + + if (ain[0] >= st->info->num_inputs || + ain[1] >= st->info->num_inputs) { + fwnode_handle_put(child); + return dev_err_probe(dev, -EINVAL, + "Input pin number out of range for pair (%d %d).", ain[0], ain[1]); + } + + if (fwnode_property_read_u32(child, "adi,reference-select", &ref_sel)) + ref_sel = AD7173_SETUP_REF_SEL_INT_REF; + ret = ad7173_get_ref_voltage_milli(st, (u8)ref_sel); + if (ret < 0) + return dev_err_probe(dev, ret, + "Cannot use reference %u", ref_sel); + if (ref_sel == AD7173_SETUP_REF_SEL_EXT_REF2 && + st->info->id != AD7173_ID) + return dev_err_probe(dev, -EINVAL, "External reference 2 is only available on ad7173-8"); + if (ref_sel == AD7173_SETUP_REF_SEL_INT_REF) + st->adc_mode |= AD7173_ADC_MODE_REF_EN; + chan_st_priv->cfg.ref_sel = ref_sel; + + *chan = ad7173_channel_template; + chan->address = chan_index; + chan->scan_index = chan_index; + chan->channel = ain[0]; + chan->channel2 = ain[1]; + chan->differential = true; + + chan_st_priv->ain = AD7173_CH_ADDRESS(ain[0], ain[1]); + chan_st_priv->chan_reg = chan_index; + chan_st_priv->cfg.input_buf = true; + chan_st_priv->cfg.odr = 0; + + chan_st_priv->cfg.bipolar = fwnode_property_read_bool(child, "bipolar"); + if (chan_st_priv->cfg.bipolar) + chan->info_mask_separate |= BIT(IIO_CHAN_INFO_OFFSET); + + chan_index++; + } + + return 0; +} + +static int ad7173_probe(struct spi_device *spi) +{ + struct ad7173_state *st; + struct iio_dev *indio_dev; + struct device *dev = &spi->dev; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + st->info = spi_get_device_match_data(spi); + if (!st->info) + return -ENODEV; + + indio_dev->name = st->info->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &ad7173_info; + + spi->mode = SPI_MODE_3; + + ad7173_sigma_delta_info.num_slots = st->info->num_configs; + ret = ad_sd_init(&st->sd, indio_dev, spi, &ad7173_sigma_delta_info); + if (ret) + return ret; + + spi_set_drvdata(spi, indio_dev); + + ret = ad7173_fw_parse_channel_config(indio_dev); + if (ret) + return ret; + + ret = devm_ad_sd_setup_buffer_and_trigger(dev, indio_dev); + if (ret) + return ret; + + ret = ad7173_setup(indio_dev); + if (ret) + return ret; + + ret = devm_iio_device_register(dev, indio_dev); + if (ret) + return ret; + + if (IS_ENABLED(CONFIG_GPIOLIB)) + return ad7173_gpio_init(st); + + return 0; +} + +static const struct of_device_id ad7173_of_match[] = { + { .compatible = "adi,ad7172-2", + .data = &ad7173_device_info[ID_AD7172_2], }, + { .compatible = "adi,ad7173-8", + .data = &ad7173_device_info[ID_AD7173_8], }, + { .compatible = "adi,ad7175-2", + .data = &ad7173_device_info[ID_AD7175_2], }, + { .compatible = "adi,ad7176-2", + .data = &ad7173_device_info[ID_AD7176_2], }, + { } +}; +MODULE_DEVICE_TABLE(of, ad7173_of_match); + +static const struct spi_device_id ad7173_id_table[] = { + { "ad7172-2", (kernel_ulong_t)&ad7173_device_info[ID_AD7172_2], }, + { "ad7173-8", (kernel_ulong_t)&ad7173_device_info[ID_AD7173_8], }, + { "ad7175-2", (kernel_ulong_t)&ad7173_device_info[ID_AD7175_2], }, + { "ad7176-2", (kernel_ulong_t)&ad7173_device_info[ID_AD7176_2], }, + { } +}; +MODULE_DEVICE_TABLE(spi, ad7173_id_table); + +static struct spi_driver ad7173_driver = { + .driver = { + .name = "ad7173", + .of_match_table = ad7173_of_match, + }, + .probe = ad7173_probe, + .id_table = ad7173_id_table, +}; +module_spi_driver(ad7173_driver); + +MODULE_AUTHOR("Lars-Peter Clausen "); +MODULE_AUTHOR("Dumitru Ceclan "); +MODULE_DESCRIPTION("Analog Devices AD7172/AD7173/AD7175/AD7176 ADC driver"); +MODULE_LICENSE("GPL");