| Message ID | 20240223133758.9787-3-mitrutzceclan@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v15,1/3] dt-bindings: adc: add AD7173 | expand |
On Fri, 2024-02-23 at 15:37 +0200, Dumitru Ceclan wrote: > 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: Andy Shevchenko <andy@kernel.org> > Reviewed-by: Michael Walle <michael@walle.cc> # for gpio-regmap > Signed-off-by: Dumitru Ceclan <mitrutzceclan@gmail.com> > --- Any reason for dropping my rb tag? Anyways... Reviewed-by: Nuno Sa <nuno.sa@analog.com> > V14-> V15 > - Use local var for dev instead of &st->sd.spi->dev > - Use sizeof(*st->config_cnts) > - Use device_property_match_property_string() > - ENODATA error when no channels are specified > V13-> V14 > - Update year copyright range > - Drop the ad_sigma_delta_info.irq_flags assigment > - Use spi_setup() after spi mode assigment > - Check IS_ENABLED(CONFIG_COMMON_CLK) for clk registering, drop fwnode NULL > check > - Rename variable fwnode > V12-> V13 > - Add precursor patch for new irq_num attribute in ad_sigma_delta_info and > ad_sigma_delta structs > - Split *_fw_parse_channel_config() into *_channel_config and *_device_config > - Reorder probe calls to ad_sd_init to use correctly the optional irq_num > attribute > - Require in probe interrupt named "rdy" to be present > - If external clock not present, register clk provider > - If external clock present, get clock and enable > - Add constants, strings for clock selections > V11-> V12 > - rename refin, refin2 to vref, vref2 > V10-> V11 <no changes> > V9 -> V10 <no changes> > V8 -> V9 > - Add '(x)' to some macro's definition to reduce NO of checks > - Use reg 0 constant definition in debug_reg_access() > - Rename channels_st_priv_arr to chans_st_arr > - Remove unnecessary u32 cast from read_raw() > - Compute read_raw() offset instead of constant > - Add offset comments to data rate arrays > - Removed redundant newline in _parse_channel_config() > V7 -> V8 > - remove Kconfig commas > - reorder include <...gpio/regmap.h> > - GPO12_DATA(x) from BIT(x) -> BIT(x+0) > - use the same pointer to dev in ad7173_setup() > - rewrite temp channel read_raw scale for better readability > - add comment to explain temp channel offset > - follow multi-line comment style > - change ref_sel type to signed int > - use fwnode_property_match_property_string() > V6 -> V7 > - format Kconfig supported models using '-' > - include types.h instead of stddef.h > - change device_info->num_gpios type to u8 > - reorder fields in ad7173_state, place ad_sigma_delta > - reorder fields in ad7173_device_info, group by type > - add default case in read_raw() > - rename ad7173_debug() to ad7173_debug_reg_access() > - remove explicit u8 cast > - remove return 0; for offset in read_raw() > - add '\n' to error messages > - reorder probe variables -> reversed xmas tree > - remove redundant inner commas in of_match and id_table > - simplify selected reference code by setting default value and ignoring > fwnode_property_read_string() error > - use match_string() for finding selected reference > - err on no channels specified > - add missing fwnode_handle_put(child) on err return branches > - remove spi_set_drvdata() from probe > - remove offset variable from find_live_config(), not used > - add comment showing a generic LRU implementation might be used if one > will exist > - MISC: add blank line to chanel_config struct, trailing comma > ref_sel_str[], > remove blank line in update_scan_mode(), add spaces around '/' > V5->V6 <no changes> > V4 -> V5 > - List Kconfig supported models one per line > - Include <array_size.h> and <container_of.h> > - Remove bits.h and kernel.h include > - Add spaces before '\' on multi-line definitions > - Change constant definition name from "..._MICROV" to "..._uV" > - Change ad7173_channel_config attributes order for grouping by type > - Remove redundant {} in ad7173_gpio_init() > - Add array with reference select strings > - Change parsing of device tree adi,reference-select from integer to string > - Change indentation for ad7173_find_live_config() header > - Use struct_group() in config struct > - Use offsetofend() and sizeof_field() in ad7173_find_live_config() > - Split line on logic operator in ad7173_find_live_config() at configs > comparison > - Use IDA for config slots allocation > - Reverse xmas tree order for probe local variables > - Use BIT() for computing bipolar channels offset > - Change (MICRO/MILLI) to MILLI in read_raw for integer part of sampling > frequency > - MISC: remove blank line, use 0 value dirrectly, one line statement > devm_kcalloc() > 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 > V2 -> V3 > - change Kconfig GPIO_REGMAP and REGMAP_SPI to be conditioned by GPIOLIB > - cast chip info to (kernel_ulong_t) to suppress warnings > - adjust copyright year to reflect the out-of-tree history > - remove unused sysfs and trigger header files > - clean up defined macros by using FIELD_PREP( ) inline > - use DECLARE_BITMAP( ) for defiining cfg_slots_status > - use clear/set _bit instead of assign_bit > - rename state field regmap to reg_gpiocon_regmap to better represent usage > - replace container_of( ) usages to ad_sigma_delta_to_ad7173( ) > - improve readability of sampling frequency conversion in write_raw( ) > specifying conversion from Micro to Milli > - use iio_device_claim_direct_mode( ) correctly in write_raw( ) > - flip logic in write_raw( ) to reduce line length > - pass only state struct to gpio_init function > - remove else branch at end of probe > - remove comma after list terminator for of_match and id_table arrays > - clarify write_raw( ) realbits 32 bit size check in a comment > - change parsed fw property 'adi,bipolar' to 'bipolar' to matched referenced > adc.yaml > - use reg_set_base for gpio regmap xlate > V1 -> V2 > - keep original out-of-tree AD7173 naming > - remove gpio_cleanup > - handle 32bit realbits offset case > - use iio_device_claim_direct_mode, drop own mutex > - use dev_err_probe > - cleanup headers include > - use GENMASK() and FIELD_PREP() > - use HZ_PER_MHZ > - change #ifdef GPIOLIB to if( IS_ENABLED(CONFIG_GPIOLIB)) > - use gpio-regmap > - change boolean flag in info struct to number of gpios > - NIH memset64 > - use struct pointers for config comparison > - use spi_write_then_read for ADC reset > - use stack allocated buffer for reset > - define constant for reset sequence size > - use kcalloc instead of kzalloc > - change of naming to fw of dt parse function > - change de-referencing chain to local variable dev in multiple locations > - drop write_raw_get_fmt > - add driver private data to spi_device_id table > - use fsleep() instead of usleep_range() > - put config value inline > - align read/write raw arguments > - remove zeroed values from channel templates structure > - define constants for temperature sensor positive and negative inputs > - always enable temperature channel > - configure spi clock phase and polarity from driver > misc changes (test bit, return disable all, indentation fix, change > statements to single line) > > drivers/iio/adc/Kconfig | 17 + > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/ad7173.c | 1104 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 1122 insertions(+) > create mode 100644 drivers/iio/adc/ad7173.c > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index 3b73c509bd68..c32054afdfc4 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -70,6 +70,23 @@ 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 models: > + - 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 d2fda54a3259..dd4210a3634f 100644 > --- a/drivers/iio/adc/Makefile > +++ b/drivers/iio/adc/Makefile > @@ -11,6 +11,7 @@ obj-$(CONFIG_AD7091R) += ad7091r-base.o > obj-$(CONFIG_AD7091R5) += ad7091r5.o > obj-$(CONFIG_AD7091R8) += ad7091r8.o > obj-$(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..3dde473cf859 > --- /dev/null > +++ b/drivers/iio/adc/ad7173.c > @@ -0,0 +1,1104 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * AD7172-2/AD7173-8/AD7175-2/AD7176-2 SPI ADC driver > + * Copyright (C) 2015, 2024 Analog Devices, Inc. > + */ > + > +#include <linux/array_size.h> > +#include <linux/bitfield.h> > +#include <linux/bitmap.h> > +#include <linux/container_of.h> > +#include <linux/clk.h> > +#include <linux/clk-provider.h> > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/err.h> > +#include <linux/gpio/driver.h> > +#include <linux/gpio/regmap.h> > +#include <linux/idr.h> > +#include <linux/interrupt.h> > +#include <linux/math64.h> > +#include <linux/module.h> > +#include <linux/mod_devicetable.h> > +#include <linux/property.h> > +#include <linux/regmap.h> > +#include <linux/regulator/consumer.h> > +#include <linux/slab.h> > +#include <linux/spi/spi.h> > +#include <linux/types.h> > +#include <linux/units.h> > + > +#include <linux/iio/buffer.h> > +#include <linux/iio/iio.h> > +#include <linux/iio/trigger_consumer.h> > +#include <linux/iio/triggered_buffer.h> > + > +#include <linux/iio/adc/ad_sigma_delta.h> > + > +#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_ADC_MODE_CLOCKSEL_INT 0x0 > +#define AD7173_ADC_MODE_CLOCKSEL_INT_OUTPUT 0x1 > +#define AD7173_ADC_MODE_CLOCKSEL_EXT 0x2 > +#define AD7173_ADC_MODE_CLOCKSEL_XTAL 0x3 > + > +#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) + 0) > +#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_uV 2500000 > +#define AD7173_TEMP_SENSIIVITY_uV_per_C 477 > + > +#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 { > + const unsigned int *sinc5_data_rates; > + unsigned int num_sinc5_data_rates; > + unsigned int num_channels; > + unsigned int num_configs; > + unsigned int num_inputs; > + unsigned int clock; > + unsigned int id; > + char *name; > + bool has_temp; > + u8 num_gpios; > +}; > + > +struct ad7173_channel_config { > + u8 cfg_slot; > + bool live; > + > + /* Following fields are used to compare equality. */ > + struct_group(config_props, > + 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 { > + struct ad_sigma_delta sd; > + const struct ad7173_device_info *info; > + struct ad7173_channel *channels; > + struct regulator_bulk_data regulators[3]; > + unsigned int adc_mode; > + unsigned int interface_mode; > + unsigned int num_channels; > + struct ida cfg_slots_status; > + unsigned long long config_usage_counter; > + unsigned long long *config_cnts; > + struct clk *ext_clk; > + struct clk_hw int_clk_hw; > +#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, /* 0-7 */ > + 3115000, 2597000, 1007000, 503800, 381000, 200300, 100500, > 59520, /* 8-15 */ > + 49680, 20010, 16333, 10000, 5000, 2500, > 1250, /* 16-22 */ > +}; > + > +static const unsigned int ad7175_sinc5_data_rates[] = { > + 50000000, 41667000, 31250000, 27778000, /* 0-3 */ > + 20833000, 17857000, 12500000, 10000000, /* 4-7 */ > + 5000000, 2500000, 1000000, 500000, /* 8-11 */ > + 397500, 200000, 100000, 59920, /* 12-15 */ > + 49960, 20000, 16666, 10000, /* 16-19 */ > + 5000, /* 20 */ > +}; > + > +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), > + }, > +}; > + > +static const char *const ad7173_ref_sel_str[] = { > + [AD7173_SETUP_REF_SEL_EXT_REF] = "vref", > + [AD7173_SETUP_REF_SEL_EXT_REF2] = "vref2", > + [AD7173_SETUP_REF_SEL_INT_REF] = "refout-avss", > + [AD7173_SETUP_REF_SEL_AVDD1_AVSS] = "avdd", > +}; > + > +static const char *const ad7173_clk_sel[] = { > + "ext-clk", "xtal" > +}; > + > +#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); > + ret = PTR_ERR_OR_ZERO(st->reg_gpiocon_regmap); > + if (ret) > + return dev_err_probe(dev, ret, "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); > + ret = PTR_ERR_OR_ZERO(st->gpio_regmap); > + if (ret) > + return dev_err_probe(dev, ret, "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 struct ad7173_state *clk_hw_to_ad7173(struct clk_hw *hw) > +{ > + return container_of(hw, struct ad7173_state, int_clk_hw); > +} > + > +static void ad7173_ida_destroy(void *data) > +{ > + struct ad7173_state *st = data; > + > + ida_destroy(&st->cfg_slots_status); > +} > + > +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; > + int i; > + > + cmp_size = sizeof_field(struct ad7173_channel_config, config_props); > + for (i = 0; i < st->num_channels; i++) { > + cfg_aux = &st->channels[i].cfg; > + > + if (cfg_aux->live && > + !memcmp(&cfg->config_props, &cfg_aux->config_props, > cmp_size)) > + return cfg_aux; > + } > + return NULL; > +} > + > +/* Could be replaced with a generic LRU implementation */ > +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; > + > + ida_free(&st->cfg_slots_status, lru_position); > + return ida_alloc(&st->cfg_slots_status, GFP_KERNEL); > +} > + > +/* Could be replaced with a generic LRU implementation */ > +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 = ida_alloc_range(&st->cfg_slots_status, 0, > + st->info->num_configs - 1, > GFP_KERNEL); > + if (free_cfg_slot < 0) > + free_cfg_slot = ad7173_free_config_slot_lru(st); > + > + 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, > +}; > + > +static int ad7173_setup(struct iio_dev *indio_dev) > +{ > + struct ad7173_state *st = iio_priv(indio_dev); > + struct device *dev = &st->sd.spi->dev; > + u8 buf[AD7173_RESET_LENGTH]; > + unsigned int id; > + 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(dev, "Unexpected device id: 0x%04X, expected: > 0x%04X\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(dev, st->info->num_configs, > + sizeof(*st->config_cnts), 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_uV; > + 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; > + u64 temp; > + 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) { > + temp = AD7173_VOLTAGE_INT_REF_uV * MILLI; > + temp /= AD7173_TEMP_SENSIIVITY_uV_per_C; > + *val = temp; > + *val2 = chan->scan_type.realbits; > + } 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) { > + /* 0 Kelvin -> raw sample */ > + temp = -ABSOLUTE_ZERO_MILLICELSIUS; > + temp *= AD7173_TEMP_SENSIIVITY_uV_per_C; > + temp <<= chan->scan_type.realbits; > + temp = DIV_U64_ROUND_CLOSEST(temp, > + > AD7173_VOLTAGE_INT_REF_uV * > + MILLI); > + *val = -temp; > + } else { > + *val = -BIT(chan->scan_type.realbits - 1); > + } > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_SAMP_FREQ: > + reg = st->channels[chan->address].cfg.odr; > + > + *val = st->info->sinc5_data_rates[reg] / MILLI; > + *val2 = (st->info->sinc5_data_rates[reg] % MILLI) * (MICRO / > MILLI); > + > + return IIO_VAL_INT_PLUS_MICRO; > + default: > + 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; > + > + 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 0; > +} > + > +static int ad7173_debug_reg_access(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 == AD7173_REG_COMMS) > + 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_reg_access, > + .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 void ad7173_clk_disable_unprepare(void *clk) > +{ > + clk_disable_unprepare(clk); > +} > + > +static unsigned long ad7173_sel_clk(struct ad7173_state *st, > + unsigned int clk_sel) > +{ > + int ret; > + > + st->adc_mode &= !AD7173_ADC_MODE_CLOCKSEL_MASK; > + st->adc_mode |= FIELD_PREP(AD7173_ADC_MODE_CLOCKSEL_MASK, clk_sel); > + ret = ad_sd_write_reg(&st->sd, AD7173_REG_ADC_MODE, 0x2, st- > >adc_mode); > + > + return ret; > +} > + > +static unsigned long ad7173_clk_recalc_rate(struct clk_hw *hw, > + unsigned long parent_rate) > +{ > + struct ad7173_state *st = clk_hw_to_ad7173(hw); > + > + return st->info->clock / HZ_PER_KHZ; > +} > + > +static int ad7173_clk_output_is_enabled(struct clk_hw *hw) > +{ > + struct ad7173_state *st = clk_hw_to_ad7173(hw); > + u32 clk_sel; > + > + clk_sel = FIELD_GET(AD7173_ADC_MODE_CLOCKSEL_MASK, st->adc_mode); > + return clk_sel == AD7173_ADC_MODE_CLOCKSEL_INT_OUTPUT; > +} > + > +static int ad7173_clk_output_prepare(struct clk_hw *hw) > +{ > + struct ad7173_state *st = clk_hw_to_ad7173(hw); > + > + return ad7173_sel_clk(st, AD7173_ADC_MODE_CLOCKSEL_INT_OUTPUT); > +} > + > +static void ad7173_clk_output_unprepare(struct clk_hw *hw) > +{ > + struct ad7173_state *st = clk_hw_to_ad7173(hw); > + > + ad7173_sel_clk(st, AD7173_ADC_MODE_CLOCKSEL_INT); > +} > + > +static const struct clk_ops ad7173_int_clk_ops = { > + .recalc_rate = ad7173_clk_recalc_rate, > + .is_enabled = ad7173_clk_output_is_enabled, > + .prepare = ad7173_clk_output_prepare, > + .unprepare = ad7173_clk_output_unprepare, > +}; > + > +static int ad7173_register_clk_provider(struct iio_dev *indio_dev) > +{ > + struct ad7173_state *st = iio_priv(indio_dev); > + struct device *dev = indio_dev->dev.parent; > + struct fwnode_handle *fwnode = dev_fwnode(dev); > + struct clk_init_data init = {}; > + int ret; > + > + if (!IS_ENABLED(CONFIG_COMMON_CLK)) > + return 0; > + > + init.name = fwnode_get_name(fwnode); > + init.ops = &ad7173_int_clk_ops; > + > + st->int_clk_hw.init = &init; > + ret = devm_clk_hw_register(dev, &st->int_clk_hw); > + if (ret) > + return ret; > + > + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, > + &st->int_clk_hw); > +} > + > +static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev) > +{ > + struct ad7173_channel *chans_st_arr, *chan_st_priv; > + struct ad7173_state *st = iio_priv(indio_dev); > + struct device *dev = indio_dev->dev.parent; > + struct iio_chan_spec *chan_arr, *chan; > + unsigned int ain[2], chan_index = 0; > + struct fwnode_handle *child; > + int ref_sel, ret; > + > + if (st->info->has_temp) { > + chan_arr[chan_index] = ad7173_temp_iio_channel_template; > + chan_st_priv = &chans_st_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 = &chans_st_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).\n", > + ain[0], ain[1]); > + } > + > + ret = fwnode_property_match_property_string(child, > + "adi,reference- > select", > + > ad7173_ref_sel_str, > + > ARRAY_SIZE(ad7173_ref_sel_str)); > + if (ret < 0) > + ref_sel = AD7173_SETUP_REF_SEL_INT_REF; > + else > + ref_sel = ret; > + > + if (ref_sel == AD7173_SETUP_REF_SEL_EXT_REF2 && > + st->info->id != AD7173_ID) { > + fwnode_handle_put(child); > + return dev_err_probe(dev, -EINVAL, "External > reference 2 is only available on ad7173-8\n"); > + } > + > + ret = ad7173_get_ref_voltage_milli(st, ref_sel); > + if (ret < 0) { > + fwnode_handle_put(child); > + return dev_err_probe(dev, ret, > + "Cannot use reference %u\n", > ref_sel); > + } > + 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_fw_parse_device_config(struct iio_dev *indio_dev) > +{ > + struct ad7173_state *st = iio_priv(indio_dev); > + struct device *dev = indio_dev->dev.parent; > + unsigned int num_channels; > + int ret; > + > + st->regulators[0].supply = > ad7173_ref_sel_str[AD7173_SETUP_REF_SEL_EXT_REF]; > + st->regulators[1].supply = > ad7173_ref_sel_str[AD7173_SETUP_REF_SEL_EXT_REF2]; > + st->regulators[2].supply = > ad7173_ref_sel_str[AD7173_SETUP_REF_SEL_AVDD1_AVSS]; > + > + /* > + * If a regulator is not available, it will be set to a dummy > regulator. > + * Each channel reference is checked with regulator_get_voltage() > before > + * setting attributes so if any channel uses a dummy supply the > driver > + * probe will fail. > + */ > + 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"); > + > + ret = device_property_match_property_string(dev, "clock-names", > + ad7173_clk_sel, > + > ARRAY_SIZE(ad7173_clk_sel)); > + if (ret < 0) { > + st->adc_mode |= FIELD_PREP(AD7173_ADC_MODE_CLOCKSEL_MASK, > AD7173_ADC_MODE_CLOCKSEL_INT); > + ad7173_register_clk_provider(indio_dev); > + } else { > + st->adc_mode |= FIELD_PREP(AD7173_ADC_MODE_CLOCKSEL_MASK, > AD7173_ADC_MODE_CLOCKSEL_EXT + ret); > + st->ext_clk = devm_clk_get(dev, ad7173_clk_sel[ret]); > + if (IS_ERR(st->ext_clk)) > + return dev_err_probe(dev, PTR_ERR(st->ext_clk), > + "Failed to get external > clock\n"); > + > + ret = clk_prepare_enable(st->ext_clk); > + if (ret) > + return dev_err_probe(dev, ret, > + "Failed to enable external > clock\n"); > + > + ret = devm_add_action_or_reset(dev, > ad7173_clk_disable_unprepare, > + st->ext_clk); > + if (ret) > + return ret; > + } > + > + ret = fwnode_irq_get_byname(dev_fwnode(dev), "rdy"); > + if (ret < 0) > + return dev_err_probe(dev, ret, "Interrupt 'rdy' is > required\n"); > + > + ad7173_sigma_delta_info.irq_line = ret; > + > + num_channels = device_get_child_node_count(dev); > + > + if (st->info->has_temp) > + num_channels++; > + > + if (num_channels == 0) > + return dev_err_probe(dev, -ENODATA, "No channels > specified\n"); > + st->num_channels = num_channels; > + > + indio_dev->channels = devm_kcalloc(dev, sizeof(*indio_dev->channels), > + num_channels, GFP_KERNEL); > + if (!indio_dev->channels) > + return -ENOMEM; > + > + st->channels = devm_kcalloc(dev, num_channels, sizeof(*st->channels), > + GFP_KERNEL); > + if (!st->channels) > + return -ENOMEM; > + > + indio_dev->num_channels = num_channels; > + return ad7173_fw_parse_channel_config(indio_dev); > +} > + > +static int ad7173_probe(struct spi_device *spi) > +{ > + struct device *dev = &spi->dev; > + struct ad7173_state *st; > + struct iio_dev *indio_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; > + > + ida_init(&st->cfg_slots_status); > + ret = devm_add_action_or_reset(dev, ad7173_ida_destroy, st); > + if (ret) > + return ret; > + > + indio_dev->name = st->info->name; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->info = &ad7173_info; > + > + spi->mode = SPI_MODE_3; > + spi_setup(spi); > + > + 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; > + > + ret = ad7173_fw_parse_device_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 <lars@metafo.de>"); > +MODULE_AUTHOR("Dumitru Ceclan <dumitru.ceclan@analog.com>"); > +MODULE_DESCRIPTION("Analog Devices AD7172/AD7173/AD7175/AD7176 ADC driver"); > +MODULE_LICENSE("GPL");
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 3b73c509bd68..c32054afdfc4 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -70,6 +70,23 @@ 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 models: + - 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 d2fda54a3259..dd4210a3634f 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_AD7091R) += ad7091r-base.o obj-$(CONFIG_AD7091R5) += ad7091r5.o obj-$(CONFIG_AD7091R8) += ad7091r8.o obj-$(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..3dde473cf859 --- /dev/null +++ b/drivers/iio/adc/ad7173.c @@ -0,0 +1,1104 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * AD7172-2/AD7173-8/AD7175-2/AD7176-2 SPI ADC driver + * Copyright (C) 2015, 2024 Analog Devices, Inc. + */ + +#include <linux/array_size.h> +#include <linux/bitfield.h> +#include <linux/bitmap.h> +#include <linux/container_of.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/gpio/regmap.h> +#include <linux/idr.h> +#include <linux/interrupt.h> +#include <linux/math64.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/types.h> +#include <linux/units.h> + +#include <linux/iio/buffer.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#include <linux/iio/adc/ad_sigma_delta.h> + +#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_ADC_MODE_CLOCKSEL_INT 0x0 +#define AD7173_ADC_MODE_CLOCKSEL_INT_OUTPUT 0x1 +#define AD7173_ADC_MODE_CLOCKSEL_EXT 0x2 +#define AD7173_ADC_MODE_CLOCKSEL_XTAL 0x3 + +#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) + 0) +#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_uV 2500000 +#define AD7173_TEMP_SENSIIVITY_uV_per_C 477 + +#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 { + const unsigned int *sinc5_data_rates; + unsigned int num_sinc5_data_rates; + unsigned int num_channels; + unsigned int num_configs; + unsigned int num_inputs; + unsigned int clock; + unsigned int id; + char *name; + bool has_temp; + u8 num_gpios; +}; + +struct ad7173_channel_config { + u8 cfg_slot; + bool live; + + /* Following fields are used to compare equality. */ + struct_group(config_props, + 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 { + struct ad_sigma_delta sd; + const struct ad7173_device_info *info; + struct ad7173_channel *channels; + struct regulator_bulk_data regulators[3]; + unsigned int adc_mode; + unsigned int interface_mode; + unsigned int num_channels; + struct ida cfg_slots_status; + unsigned long long config_usage_counter; + unsigned long long *config_cnts; + struct clk *ext_clk; + struct clk_hw int_clk_hw; +#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, /* 0-7 */ + 3115000, 2597000, 1007000, 503800, 381000, 200300, 100500, 59520, /* 8-15 */ + 49680, 20010, 16333, 10000, 5000, 2500, 1250, /* 16-22 */ +}; + +static const unsigned int ad7175_sinc5_data_rates[] = { + 50000000, 41667000, 31250000, 27778000, /* 0-3 */ + 20833000, 17857000, 12500000, 10000000, /* 4-7 */ + 5000000, 2500000, 1000000, 500000, /* 8-11 */ + 397500, 200000, 100000, 59920, /* 12-15 */ + 49960, 20000, 16666, 10000, /* 16-19 */ + 5000, /* 20 */ +}; + +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), + }, +}; + +static const char *const ad7173_ref_sel_str[] = { + [AD7173_SETUP_REF_SEL_EXT_REF] = "vref", + [AD7173_SETUP_REF_SEL_EXT_REF2] = "vref2", + [AD7173_SETUP_REF_SEL_INT_REF] = "refout-avss", + [AD7173_SETUP_REF_SEL_AVDD1_AVSS] = "avdd", +}; + +static const char *const ad7173_clk_sel[] = { + "ext-clk", "xtal" +}; + +#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); + ret = PTR_ERR_OR_ZERO(st->reg_gpiocon_regmap); + if (ret) + return dev_err_probe(dev, ret, "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); + ret = PTR_ERR_OR_ZERO(st->gpio_regmap); + if (ret) + return dev_err_probe(dev, ret, "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 struct ad7173_state *clk_hw_to_ad7173(struct clk_hw *hw) +{ + return container_of(hw, struct ad7173_state, int_clk_hw); +} + +static void ad7173_ida_destroy(void *data) +{ + struct ad7173_state *st = data; + + ida_destroy(&st->cfg_slots_status); +} + +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; + int i; + + cmp_size = sizeof_field(struct ad7173_channel_config, config_props); + for (i = 0; i < st->num_channels; i++) { + cfg_aux = &st->channels[i].cfg; + + if (cfg_aux->live && + !memcmp(&cfg->config_props, &cfg_aux->config_props, cmp_size)) + return cfg_aux; + } + return NULL; +} + +/* Could be replaced with a generic LRU implementation */ +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; + + ida_free(&st->cfg_slots_status, lru_position); + return ida_alloc(&st->cfg_slots_status, GFP_KERNEL); +} + +/* Could be replaced with a generic LRU implementation */ +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 = ida_alloc_range(&st->cfg_slots_status, 0, + st->info->num_configs - 1, GFP_KERNEL); + if (free_cfg_slot < 0) + free_cfg_slot = ad7173_free_config_slot_lru(st); + + 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, +}; + +static int ad7173_setup(struct iio_dev *indio_dev) +{ + struct ad7173_state *st = iio_priv(indio_dev); + struct device *dev = &st->sd.spi->dev; + u8 buf[AD7173_RESET_LENGTH]; + unsigned int id; + 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(dev, "Unexpected device id: 0x%04X, expected: 0x%04X\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(dev, st->info->num_configs, + sizeof(*st->config_cnts), 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_uV; + 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; + u64 temp; + 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) { + temp = AD7173_VOLTAGE_INT_REF_uV * MILLI; + temp /= AD7173_TEMP_SENSIIVITY_uV_per_C; + *val = temp; + *val2 = chan->scan_type.realbits; + } 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) { + /* 0 Kelvin -> raw sample */ + temp = -ABSOLUTE_ZERO_MILLICELSIUS; + temp *= AD7173_TEMP_SENSIIVITY_uV_per_C; + temp <<= chan->scan_type.realbits; + temp = DIV_U64_ROUND_CLOSEST(temp, + AD7173_VOLTAGE_INT_REF_uV * + MILLI); + *val = -temp; + } else { + *val = -BIT(chan->scan_type.realbits - 1); + } + return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + reg = st->channels[chan->address].cfg.odr; + + *val = st->info->sinc5_data_rates[reg] / MILLI; + *val2 = (st->info->sinc5_data_rates[reg] % MILLI) * (MICRO / MILLI); + + return IIO_VAL_INT_PLUS_MICRO; + default: + 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; + + 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 0; +} + +static int ad7173_debug_reg_access(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 == AD7173_REG_COMMS) + 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_reg_access, + .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 void ad7173_clk_disable_unprepare(void *clk) +{ + clk_disable_unprepare(clk); +} + +static unsigned long ad7173_sel_clk(struct ad7173_state *st, + unsigned int clk_sel) +{ + int ret; + + st->adc_mode &= !AD7173_ADC_MODE_CLOCKSEL_MASK; + st->adc_mode |= FIELD_PREP(AD7173_ADC_MODE_CLOCKSEL_MASK, clk_sel); + ret = ad_sd_write_reg(&st->sd, AD7173_REG_ADC_MODE, 0x2, st->adc_mode); + + return ret; +} + +static unsigned long ad7173_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct ad7173_state *st = clk_hw_to_ad7173(hw); + + return st->info->clock / HZ_PER_KHZ; +} + +static int ad7173_clk_output_is_enabled(struct clk_hw *hw) +{ + struct ad7173_state *st = clk_hw_to_ad7173(hw); + u32 clk_sel; + + clk_sel = FIELD_GET(AD7173_ADC_MODE_CLOCKSEL_MASK, st->adc_mode); + return clk_sel == AD7173_ADC_MODE_CLOCKSEL_INT_OUTPUT; +} + +static int ad7173_clk_output_prepare(struct clk_hw *hw) +{ + struct ad7173_state *st = clk_hw_to_ad7173(hw); + + return ad7173_sel_clk(st, AD7173_ADC_MODE_CLOCKSEL_INT_OUTPUT); +} + +static void ad7173_clk_output_unprepare(struct clk_hw *hw) +{ + struct ad7173_state *st = clk_hw_to_ad7173(hw); + + ad7173_sel_clk(st, AD7173_ADC_MODE_CLOCKSEL_INT); +} + +static const struct clk_ops ad7173_int_clk_ops = { + .recalc_rate = ad7173_clk_recalc_rate, + .is_enabled = ad7173_clk_output_is_enabled, + .prepare = ad7173_clk_output_prepare, + .unprepare = ad7173_clk_output_unprepare, +}; + +static int ad7173_register_clk_provider(struct iio_dev *indio_dev) +{ + struct ad7173_state *st = iio_priv(indio_dev); + struct device *dev = indio_dev->dev.parent; + struct fwnode_handle *fwnode = dev_fwnode(dev); + struct clk_init_data init = {}; + int ret; + + if (!IS_ENABLED(CONFIG_COMMON_CLK)) + return 0; + + init.name = fwnode_get_name(fwnode); + init.ops = &ad7173_int_clk_ops; + + st->int_clk_hw.init = &init; + ret = devm_clk_hw_register(dev, &st->int_clk_hw); + if (ret) + return ret; + + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, + &st->int_clk_hw); +} + +static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev) +{ + struct ad7173_channel *chans_st_arr, *chan_st_priv; + struct ad7173_state *st = iio_priv(indio_dev); + struct device *dev = indio_dev->dev.parent; + struct iio_chan_spec *chan_arr, *chan; + unsigned int ain[2], chan_index = 0; + struct fwnode_handle *child; + int ref_sel, ret; + + if (st->info->has_temp) { + chan_arr[chan_index] = ad7173_temp_iio_channel_template; + chan_st_priv = &chans_st_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 = &chans_st_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).\n", + ain[0], ain[1]); + } + + ret = fwnode_property_match_property_string(child, + "adi,reference-select", + ad7173_ref_sel_str, + ARRAY_SIZE(ad7173_ref_sel_str)); + if (ret < 0) + ref_sel = AD7173_SETUP_REF_SEL_INT_REF; + else + ref_sel = ret; + + if (ref_sel == AD7173_SETUP_REF_SEL_EXT_REF2 && + st->info->id != AD7173_ID) { + fwnode_handle_put(child); + return dev_err_probe(dev, -EINVAL, "External reference 2 is only available on ad7173-8\n"); + } + + ret = ad7173_get_ref_voltage_milli(st, ref_sel); + if (ret < 0) { + fwnode_handle_put(child); + return dev_err_probe(dev, ret, + "Cannot use reference %u\n", ref_sel); + } + 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_fw_parse_device_config(struct iio_dev *indio_dev) +{ + struct ad7173_state *st = iio_priv(indio_dev); + struct device *dev = indio_dev->dev.parent; + unsigned int num_channels; + int ret; + + st->regulators[0].supply = ad7173_ref_sel_str[AD7173_SETUP_REF_SEL_EXT_REF]; + st->regulators[1].supply = ad7173_ref_sel_str[AD7173_SETUP_REF_SEL_EXT_REF2]; + st->regulators[2].supply = ad7173_ref_sel_str[AD7173_SETUP_REF_SEL_AVDD1_AVSS]; + + /* + * If a regulator is not available, it will be set to a dummy regulator. + * Each channel reference is checked with regulator_get_voltage() before + * setting attributes so if any channel uses a dummy supply the driver + * probe will fail. + */ + 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"); + + ret = device_property_match_property_string(dev, "clock-names", + ad7173_clk_sel, + ARRAY_SIZE(ad7173_clk_sel)); + if (ret < 0) { + st->adc_mode |= FIELD_PREP(AD7173_ADC_MODE_CLOCKSEL_MASK, AD7173_ADC_MODE_CLOCKSEL_INT); + ad7173_register_clk_provider(indio_dev); + } else { + st->adc_mode |= FIELD_PREP(AD7173_ADC_MODE_CLOCKSEL_MASK, AD7173_ADC_MODE_CLOCKSEL_EXT + ret); + st->ext_clk = devm_clk_get(dev, ad7173_clk_sel[ret]); + if (IS_ERR(st->ext_clk)) + return dev_err_probe(dev, PTR_ERR(st->ext_clk), + "Failed to get external clock\n"); + + ret = clk_prepare_enable(st->ext_clk); + if (ret) + return dev_err_probe(dev, ret, + "Failed to enable external clock\n"); + + ret = devm_add_action_or_reset(dev, ad7173_clk_disable_unprepare, + st->ext_clk); + if (ret) + return ret; + } + + ret = fwnode_irq_get_byname(dev_fwnode(dev), "rdy"); + if (ret < 0) + return dev_err_probe(dev, ret, "Interrupt 'rdy' is required\n"); + + ad7173_sigma_delta_info.irq_line = ret; + + num_channels = device_get_child_node_count(dev); + + if (st->info->has_temp) + num_channels++; + + if (num_channels == 0) + return dev_err_probe(dev, -ENODATA, "No channels specified\n"); + st->num_channels = num_channels; + + indio_dev->channels = devm_kcalloc(dev, sizeof(*indio_dev->channels), + num_channels, GFP_KERNEL); + if (!indio_dev->channels) + return -ENOMEM; + + st->channels = devm_kcalloc(dev, num_channels, sizeof(*st->channels), + GFP_KERNEL); + if (!st->channels) + return -ENOMEM; + + indio_dev->num_channels = num_channels; + return ad7173_fw_parse_channel_config(indio_dev); +} + +static int ad7173_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct ad7173_state *st; + struct iio_dev *indio_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; + + ida_init(&st->cfg_slots_status); + ret = devm_add_action_or_reset(dev, ad7173_ida_destroy, st); + if (ret) + return ret; + + indio_dev->name = st->info->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &ad7173_info; + + spi->mode = SPI_MODE_3; + spi_setup(spi); + + 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; + + ret = ad7173_fw_parse_device_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 <lars@metafo.de>"); +MODULE_AUTHOR("Dumitru Ceclan <dumitru.ceclan@analog.com>"); +MODULE_DESCRIPTION("Analog Devices AD7172/AD7173/AD7175/AD7176 ADC driver"); +MODULE_LICENSE("GPL");