The AD5766/AD5767 are 16-channel, 16-bit/12-bit, voltage output dense DACs Digital-to-Analog converters. This change adds support for these DACs. Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ad5766-5767.pdf Signed-off-by: Cristian Pop <cristian.pop@xxxxxxxxxx> --- Changelog in v3: - Add ABI doc - Add build files - Fix build, define local macro "IIO_ENUM_AVAILABLE_SHARED" - Better description for "lock" variable - Use "put_unaligned_xx16"a - Rename to: "_ad5766_spi_write" and "_ad5766_spi_read" from "_ad5766_spi_write" and "_ad5766_spi_read" drivers/iio/dac/Kconfig | 10 + drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ad5766.c | 766 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 777 insertions(+) create mode 100644 drivers/iio/dac/ad5766.c diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index 6f6074a5d3db..cea07b4cced1 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -189,6 +189,16 @@ config AD5764 To compile this driver as a module, choose M here: the module will be called ad5764. +config AD5766 + tristate "Analog Devices AD5766/AD5767 DAC driver" + depends on SPI_MASTER + help + Say yes here to build support for Analog Devices AD5766, AD5767 + Digital to Analog Converter. + + To compile this driver as a module, choose M here: the + module will be called ad5766. + config AD5770R tristate "Analog Devices AD5770R IDAC driver" depends on SPI_MASTER diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 2fc481167724..33e16f14902a 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_AD5755) += ad5755.o obj-$(CONFIG_AD5755) += ad5758.o obj-$(CONFIG_AD5761) += ad5761.o obj-$(CONFIG_AD5764) += ad5764.o +obj-$(CONFIG_AD5766) += ad5766.o obj-$(CONFIG_AD5770R) += ad5770r.o obj-$(CONFIG_AD5791) += ad5791.o obj-$(CONFIG_AD5686) += ad5686.o diff --git a/drivers/iio/dac/ad5766.c b/drivers/iio/dac/ad5766.c new file mode 100644 index 000000000000..3c634d63a6db --- /dev/null +++ b/drivers/iio/dac/ad5766.c @@ -0,0 +1,766 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices AD5766, AD5767 + * Digital to Analog Converters driver + * + * Copyright 2019-2020 Analog Devices Inc. + */ + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/iio/iio.h> +#include <linux/bitfield.h> +#include <linux/unaligned/be_byteshift.h> + +#define AD5766_UPPER_WORD_SPI_MASK GENMASK(31, 16) +#define AD5766_LOWER_WORD_SPI_MASK GENMASK(15, 0) +#define AD5766_DITHER_SOURCE_MASK(x) GENMASK(((2 * x) + 1), (2 * x)) +#define AD5766_DITHER_SCALE_MASK(x) AD5766_DITHER_SOURCE_MASK(x) + +#define AD5766_CMD_NOP_MUX_OUT 0x00 +#define AD5766_CMD_SDO_CNTRL 0x01 +#define AD5766_CMD_WR_IN_REG(x) (0x10 | ((x) & 0xF)) +#define AD5766_CMD_WR_DAC_REG(x) (0x20 | ((x) & 0xF)) +#define AD5766_CMD_SW_LDAC 0x30 +#define AD5766_CMD_SPAN_REG 0x40 +#define AD5766_CMD_WR_PWR_DITHER 0x51 +#define AD5766_CMD_WR_DAC_REG_ALL 0x60 +#define AD5766_CMD_SW_FULL_RESET 0x70 +#define AD5766_CMD_READBACK_REG(x) (0x80 | ((x) & 0xF)) +#define AD5766_CMD_DITHER_SIG_1 0x90 +#define AD5766_CMD_DITHER_SIG_2 0xA0 +#define AD5766_CMD_INV_DITHER 0xB0 +#define AD5766_CMD_DITHER_SCALE_1 0xC0 +#define AD5766_CMD_DITHER_SCALE_2 0xD0 + +#define AD5766_FULL_RESET_CODE 0x1234 + +enum ad5766_type { + ID_AD5766, + ID_AD5767, +}; + +enum ad5766_voltage_range { + AD5766_VOLTAGE_RANGE_M20V_0V, + AD5766_VOLTAGE_RANGE_M16V_to_0V, + AD5766_VOLTAGE_RANGE_M10V_to_0V, + AD5766_VOLTAGE_RANGE_M12V_to_14V, + AD5766_VOLTAGE_RANGE_M16V_to_10V, + AD5766_VOLTAGE_RANGE_M10V_to_6V, + AD5766_VOLTAGE_RANGE_M5V_to_5V, + AD5766_VOLTAGE_RANGE_M10V_to_10V, + AD5766_VOLTAGE_RANGE_MAX, +}; + +/** + * struct ad5766_chip_info - chip specific information + * @num_channels: number of channels + * @channel: channel specification + */ +struct ad5766_chip_info { + unsigned int num_channels; + const struct iio_chan_spec *channels; +}; + +enum { + AD5766_DITHER_PWR, + AD5766_DITHER_INVERT +}; + +/* + * External dither signal can be composed with the DAC output, if activated. + * The dither signals are applied to the N0 and N1 input pins. + * Dither source for each of the channel can be selected by writing to + * "dither_source",a 32 bit variable and two bits are used for each of the 16 + * channels: 0: NO_DITHER, 1: N0, 2: N1. + * This variable holds available dither source strings. + */ +static const char * const ad5766_dither_sources[] = { + "NO_DITHER", + "N0", + "N1", +}; + +/* + * Dither signal can also be scaled. + * Available dither scale strings coresponding to "dither_scale" field in + * "struct ad5766_state". + * "dither_scale" is a 32 bit variable and two bits are used for each of the 16 + * channels: 0: NO_SCALING, 1: 75%_SCALING, 2: 50%_SCALING, 3: 25%_SCALING. + */ +static const char * const ad5766_dither_scales[] = { + "NO_SCALING", + "75%_SCALING", + "50%_SCALING", + "25%_SCALING", +}; + +/** + * struct ad5766_state - driver instance specific data + * @spi: SPI device + * @lock: Lock used to restrict concurent access to SPI device + * @chip_info: Chip model specific constants + * @gpio_reset: Reset GPIO, used to reset the device + * @crt_range: Current selected output range + * @cached_offset: Cached range coresponding to the selected offset + * @dither_power_ctrl: Power-down bit for each channel dither block (for + * example, D15 = DAC 15,D8 = DAC 8, and D0 = DAC 0) + * 0 - Normal operation, 1 - Power down + * @dither_invert: Inverts the dither signal applied to the selected DAC + * outputs + * @dither_source: Selects between 3 possible sources: + * 0: No dither, 1: N0, 2: N1 + * Two bits are used for each channel + * @dither_scale: Selects between 4 possible scales: + * 0: No scale, 1: 75%, 2: 50%, 3: 25% + * Two bits are used for each channel + * @scale_avail: Scale available table + * @offset_avail: Offest available table + * @data: SPI transfer buffers + */ +struct ad5766_state { + struct spi_device *spi; + struct mutex lock; + const struct ad5766_chip_info *chip_info; + struct gpio_desc *gpio_reset; + enum ad5766_voltage_range crt_range; + enum ad5766_voltage_range cached_offset; + u16 dither_power_ctrl; + u16 dither_invert; + u32 dither_source; + u32 dither_scale; + int scale_avail[AD5766_VOLTAGE_RANGE_MAX][2]; + int offset_avail[AD5766_VOLTAGE_RANGE_MAX][2]; + union { + u32 d32; + u16 w16[2]; + u8 b8[4]; + } data[3] ____cacheline_aligned; +}; + +struct ad5766_span_tbl { + int min; + int max; +}; + +static const struct ad5766_span_tbl ad5766_span_tbl[] = { + [AD5766_VOLTAGE_RANGE_M20V_0V] = { + .min = -20, + .max = 0, + }, + [AD5766_VOLTAGE_RANGE_M16V_to_0V] = { + .min = -16, + .max = 0, + }, + [AD5766_VOLTAGE_RANGE_M10V_to_0V] = { + .min = -10, + .max = 0, + }, + [AD5766_VOLTAGE_RANGE_M12V_to_14V] = { + .min = -12, + .max = 14, + }, + [AD5766_VOLTAGE_RANGE_M16V_to_10V] = { + .min = -16, + .max = 10, + }, + [AD5766_VOLTAGE_RANGE_M10V_to_6V] = { + .min = -10, + .max = 6, + }, + [AD5766_VOLTAGE_RANGE_M5V_to_5V] = { + .min = -5, + .max = 5, + }, + [AD5766_VOLTAGE_RANGE_M10V_to_10V] = { + .min = -10, + .max = 10, + }, +}; + +static int __ad5766_spi_read(struct ad5766_state *st, u8 dac, int *val) +{ + int ret; + struct spi_transfer xfers[] = { + { + .tx_buf = &st->data[0].d32, + .bits_per_word = 8, + .len = 3, + .cs_change = 1, + }, { + .tx_buf = &st->data[1].d32, + .rx_buf = &st->data[2].d32, + .bits_per_word = 8, + .len = 3, + }, + }; + + st->data[0].d32 = AD5766_CMD_READBACK_REG(dac); + st->data[1].d32 = AD5766_CMD_NOP_MUX_OUT; + + ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers)); + if (ret) + return ret; + + *val = st->data[2].w16[1]; + + return ret; +} + +static int __ad5766_spi_write(struct ad5766_state *st, u8 command, u16 data) +{ + st->data[0].b8[0] = command; + put_unaligned_be16(data, &st->data[0].b8[1]); + + return spi_write(st->spi, &st->data[0].b8[0], 3); +} + +static int ad5766_read(struct iio_dev *indio_dev, u8 dac, int *val) +{ + struct ad5766_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&st->lock); + ret = __ad5766_spi_read(st, dac, val); + mutex_unlock(&st->lock); + + return ret; +} + +static int ad5766_write(struct iio_dev *indio_dev, u8 dac, u16 data) +{ + struct ad5766_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&st->lock); + ret = __ad5766_spi_write(st, AD5766_CMD_WR_DAC_REG(dac), data); + mutex_unlock(&st->lock); + + return ret; +} + +static int ad5766_reset(struct ad5766_state *st) +{ + int ret = 0; + + if (st->gpio_reset) { + gpiod_set_value_cansleep(st->gpio_reset, 0); + ndelay(100); /* t_reset >= 100ns */ + gpiod_set_value_cansleep(st->gpio_reset, 1); + } else { + ret = __ad5766_spi_write(st, AD5766_CMD_SW_FULL_RESET, + AD5766_FULL_RESET_CODE); + if (ret < 0) + return ret; + } + + /* + * Minimum time between a reset and the subsequent successful write is + * typically 25 ns + */ + ndelay(25); + + return 0; +} + +static int ad5766_default_setup(struct ad5766_state *st, + enum ad5766_voltage_range range) +{ + int ret; + uint16_t val; + + /* Always issue a software reset before writing to the span register. */ + ret = ad5766_reset(st); + if (ret) + return ret; + + ret = __ad5766_spi_write(st, AD5766_CMD_SPAN_REG, range); + if (ret) + return ret; + + st->crt_range = range; + st->cached_offset = range; + + st->dither_power_ctrl = 0; + ret = __ad5766_spi_write(st, AD5766_CMD_WR_PWR_DITHER, + st->dither_power_ctrl); + if (ret) + return ret; + + st->dither_source = 0; + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_source); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SIG_1, + st->dither_source & 0xFFFF); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_source); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SIG_2, val); + if (ret) + return ret; + + st->dither_scale = 0; + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_scale); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SCALE_1, val); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_scale); + ret = __ad5766_spi_write(st, AD5766_CMD_DITHER_SCALE_2, val); + if (ret) + return ret; + + st->dither_invert = 0; + ret = __ad5766_spi_write(st, AD5766_CMD_INV_DITHER, st->dither_invert); + if (ret) + return ret; + + return 0; +} + +static int ad5766_set_offset(struct ad5766_state *st, int val, int val2) +{ + int i; + s32 (*tbl)[AD5766_VOLTAGE_RANGE_MAX][2] = &(st->offset_avail); + + for (i = 0; i < AD5766_VOLTAGE_RANGE_MAX; i++) { + if ((*tbl)[i][0] == val && (*tbl)[i][1] == val2) { + st->cached_offset = i; + return 0; + } + } + + return -EINVAL; +} + +static int ad5766_set_scale(struct ad5766_state *st, int val, int val2) +{ + int i; + enum ad5766_voltage_range offset_idx = st->cached_offset; + s32 (*offset_tbl)[AD5766_VOLTAGE_RANGE_MAX][2] = &(st->offset_avail); + s32 (*scale_tbl)[AD5766_VOLTAGE_RANGE_MAX][2] = &(st->scale_avail); + + for (i = 0; i < AD5766_VOLTAGE_RANGE_MAX; i++) { + if ((*scale_tbl)[i][0] != val || (*scale_tbl)[i][1] != val2) + continue; + + if ((*offset_tbl)[i][0] != (*offset_tbl)[offset_idx][0] || + (*offset_tbl)[i][1] != (*offset_tbl)[offset_idx][1]) + continue; + + return ad5766_default_setup(st, i); + } + + return -EINVAL; +} + +static int ad5766_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + struct ad5766_state *st = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + *vals = (const int *)st->scale_avail; + *type = IIO_VAL_INT_PLUS_MICRO; + /* Values are stored in a 2D matrix */ + *length = AD5766_VOLTAGE_RANGE_MAX * 2; + + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_OFFSET: + *vals = (const int *)st->offset_avail; + *type = IIO_VAL_INT_PLUS_MICRO; + /* Values are stored in a 2D matrix */ + *length = AD5766_VOLTAGE_RANGE_MAX * 2; + + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int ad5766_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + int ret; + struct ad5766_state *st = iio_priv(indio_dev); + + switch (m) { + case IIO_CHAN_INFO_RAW: + ret = ad5766_read(indio_dev, chan->address, val); + if (ret) + return ret; + + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val = st->scale_avail[st->crt_range][0]; + *val2 = st->scale_avail[st->crt_range][1]; + + return IIO_VAL_INT_PLUS_MICRO; + + case IIO_CHAN_INFO_OFFSET: + *val = st->offset_avail[st->crt_range][0]; + *val2 = st->offset_avail[st->crt_range][1]; + + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static int ad5766_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long info) +{ + struct ad5766_state *st = iio_priv(indio_dev); + + switch (info) { + case IIO_CHAN_INFO_RAW: + { + const int max_val = (1 << chan->scan_type.realbits); + + if (val >= max_val || val < 0) + return -EINVAL; + val <<= chan->scan_type.shift; + return ad5766_write(indio_dev, chan->address, val); + } + case IIO_CHAN_INFO_OFFSET: + return ad5766_set_offset(st, val, val2); + case IIO_CHAN_INFO_SCALE: + return ad5766_set_scale(st, val, val2); + default: + return -EINVAL; + } +} + +static const struct iio_info ad5766_info = { + .read_raw = ad5766_read_raw, + .write_raw = ad5766_write_raw, + .read_avail = ad5766_read_avail, +}; + +static int ad5766_get_dither_source(struct iio_dev *dev, + const struct iio_chan_spec *chan) +{ + struct ad5766_state *st = iio_priv(dev); + u32 source; + + source = st->dither_source & AD5766_DITHER_SOURCE_MASK(chan->channel); + + return (source >> chan->channel * 2); +} + +static int ad5766_set_dither_source(struct iio_dev *dev, + const struct iio_chan_spec *chan, + unsigned int mode) +{ + int ret; + struct ad5766_state *st = iio_priv(dev); + uint16_t val; + + st->dither_source &= ~AD5766_DITHER_SOURCE_MASK(chan->channel); + st->dither_source |= (mode << (chan->channel * 2)); + + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_source); + ret = ad5766_write(dev, AD5766_CMD_DITHER_SIG_1, val); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_source); + return ad5766_write(dev, AD5766_CMD_DITHER_SIG_2, val); +} + +static const struct iio_enum ad5766_dither_source_enum = { + .items = ad5766_dither_sources, + .num_items = ARRAY_SIZE(ad5766_dither_sources), + .set = ad5766_set_dither_source, + .get = ad5766_get_dither_source, +}; + +static int ad5766_get_dither_scale(struct iio_dev *dev, + const struct iio_chan_spec *chan) +{ + struct ad5766_state *st = iio_priv(dev); + u32 scale; + + scale = st->dither_scale & AD5766_DITHER_SCALE_MASK(chan->channel); + + return (scale >> chan->channel * 2); +} + +static int ad5766_set_dither_scale(struct iio_dev *dev, + const struct iio_chan_spec *chan, + unsigned int scale) +{ + int ret; + struct ad5766_state *st = iio_priv(dev); + uint16_t val; + + st->dither_scale &= ~AD5766_DITHER_SCALE_MASK(chan->channel); + st->dither_scale |= (scale << (chan->channel * 2)); + + val = FIELD_GET(AD5766_LOWER_WORD_SPI_MASK, st->dither_scale); + ret = ad5766_write(dev, AD5766_CMD_DITHER_SCALE_1, val); + if (ret) + return ret; + + val = FIELD_GET(AD5766_UPPER_WORD_SPI_MASK, st->dither_scale); + return ad5766_write(dev, AD5766_CMD_DITHER_SCALE_2, val); +} + +static const struct iio_enum ad5766_dither_scale_enum = { + .items = ad5766_dither_scales, + .num_items = ARRAY_SIZE(ad5766_dither_scales), + .set = ad5766_set_dither_scale, + .get = ad5766_get_dither_scale, +}; + +static ssize_t ad5766_read_ext(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + int ret; + struct ad5766_state *st = iio_priv(indio_dev); + + switch ((u32)private) { + case AD5766_DITHER_PWR: + return sprintf(buf, "%u\n", 0x01 & + ~(st->dither_power_ctrl >> chan->channel)); + break; + case AD5766_DITHER_INVERT: + return sprintf(buf, "%u\n", 0x01 & + (st->dither_invert >> chan->channel)); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static ssize_t ad5766_write_ext(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + bool readin; + int ret; + struct ad5766_state *st = iio_priv(indio_dev); + + ret = kstrtobool(buf, &readin); + if (ret) + return ret; + + switch ((u32)private) { + case AD5766_DITHER_PWR: + ret = kstrtobool(buf, &readin); + if (ret) + break; + readin = !readin; + st->dither_power_ctrl = (st->dither_power_ctrl & + ~BIT(chan->channel)) | + (readin << chan->channel); + ret = ad5766_write(indio_dev, AD5766_CMD_WR_PWR_DITHER, + st->dither_power_ctrl); + break; + case AD5766_DITHER_INVERT: + st->dither_invert = (st->dither_invert & + ~BIT(chan->channel)) | + (readin << chan->channel); + ret = ad5766_write(indio_dev, AD5766_CMD_INV_DITHER, + st->dither_power_ctrl); + break; + default: + ret = -EINVAL; + break; + } + + return ret ? ret : len; +} + +#define _AD5766_CHAN_EXT_INFO(_name, _what, _shared) { \ + .name = _name, \ + .read = ad5766_read_ext, \ + .write = ad5766_write_ext, \ + .private = _what, \ + .shared = _shared, \ +} + +#define IIO_ENUM_AVAILABLE_SHARED(_name, _shared, _e) \ +{ \ + .name = (_name "_available"), \ + .shared = _shared, \ + .read = iio_enum_available_read, \ + .private = (uintptr_t)(_e), \ +} + +static const struct iio_chan_spec_ext_info ad5766_ext_info[] = { + + _AD5766_CHAN_EXT_INFO("dither_pwr", AD5766_DITHER_PWR, IIO_SEPARATE), + _AD5766_CHAN_EXT_INFO("dither_invert", AD5766_DITHER_INVERT, + IIO_SEPARATE), + IIO_ENUM("dither_source", IIO_SEPARATE, &ad5766_dither_source_enum), + IIO_ENUM_AVAILABLE_SHARED("dither_source", + IIO_SEPARATE, + &ad5766_dither_source_enum), + IIO_ENUM("dither_scale", IIO_SEPARATE, &ad5766_dither_scale_enum), + IIO_ENUM_AVAILABLE_SHARED("dither_scale", + IIO_SEPARATE, + &ad5766_dither_scale_enum), + {} +}; + +#define AD576x_CHANNEL(_chan, _bits) { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .output = 1, \ + .channel = (_chan), \ + .address = (_chan), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type_available = \ + BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = (_bits), \ + .storagebits = 16, \ + .shift = 16 - (_bits), \ + }, \ + .ext_info = ad5766_ext_info, \ +} + +#define DECLARE_AD576x_CHANNELS(_name, _bits) \ +const struct iio_chan_spec _name[] = { \ + AD576x_CHANNEL(0, (_bits)), \ + AD576x_CHANNEL(1, (_bits)), \ + AD576x_CHANNEL(2, (_bits)), \ + AD576x_CHANNEL(3, (_bits)), \ + AD576x_CHANNEL(4, (_bits)), \ + AD576x_CHANNEL(5, (_bits)), \ + AD576x_CHANNEL(6, (_bits)), \ + AD576x_CHANNEL(7, (_bits)), \ + AD576x_CHANNEL(8, (_bits)), \ + AD576x_CHANNEL(9, (_bits)), \ + AD576x_CHANNEL(10, (_bits)), \ + AD576x_CHANNEL(11, (_bits)), \ + AD576x_CHANNEL(12, (_bits)), \ + AD576x_CHANNEL(13, (_bits)), \ + AD576x_CHANNEL(14, (_bits)), \ + AD576x_CHANNEL(15, (_bits)), \ +} + +static DECLARE_AD576x_CHANNELS(ad5766_channels, 16); +static DECLARE_AD576x_CHANNELS(ad5767_channels, 12); + +static const struct ad5766_chip_info ad5766_chip_infos[] = { + [ID_AD5766] = { + .num_channels = ARRAY_SIZE(ad5766_channels), + .channels = ad5766_channels, + }, + [ID_AD5767] = { + .num_channels = ARRAY_SIZE(ad5767_channels), + .channels = ad5767_channels, + }, +}; + +static void ad5766_init_scale_tables(struct ad5766_state *st) +{ + int i; + s32 denom; + s64 offset; + u64 scale; + u8 realbits = st->chip_info->channels[0].scan_type.realbits; + + for (i = 0; i < AD5766_VOLTAGE_RANGE_MAX; i++) { + offset = (1 << realbits) * ad5766_span_tbl[i].min; + denom = ad5766_span_tbl[i].max - ad5766_span_tbl[i].min; + offset = div_s64(offset * 1000000, denom); + st->offset_avail[i][0] = div_s64(offset, 1000000); + div_s64_rem(offset, 1000000, &st->offset_avail[i][1]); + + scale = ad5766_span_tbl[i].max - ad5766_span_tbl[i].min; + scale = div_u64((scale * 1000000000), (1 << realbits)); + st->scale_avail[i][0] = (int)div_u64(scale, 1000000); + div_s64_rem(scale, 1000000, &st->scale_avail[i][1]); + } +} + +static int ad5766_probe(struct spi_device *spi) +{ + enum ad5766_type type; + struct iio_dev *indio_dev; + struct ad5766_state *st; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + mutex_init(&st->lock); + + st->spi = spi; + type = spi_get_device_id(spi)->driver_data; + st->chip_info = &ad5766_chip_infos[type]; + + indio_dev->channels = st->chip_info->channels; + indio_dev->num_channels = st->chip_info->num_channels; + indio_dev->info = &ad5766_info; + indio_dev->dev.parent = &spi->dev; + indio_dev->dev.of_node = spi->dev.of_node; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + + st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset", + GPIOD_OUT_HIGH); + + ad5766_init_scale_tables(st); + + ret = ad5766_default_setup(st, AD5766_VOLTAGE_RANGE_M5V_to_5V); + if (ret) + return ret; + + return devm_iio_device_register(&spi->dev, indio_dev); +} + +static const struct of_device_id ad5766_dt_match[] = { + { .compatible = "adi,ad5766" }, + { .compatible = "adi,ad5767" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ad5766_dt_match); + +static const struct spi_device_id ad5766_spi_ids[] = { + { "ad5766", ID_AD5766 }, + { "ad5767", ID_AD5767 }, + {} +}; +MODULE_DEVICE_TABLE(spi, ad5766_spi_ids); + +static struct spi_driver ad5766_driver = { + .driver = { + .name = "ad5766", + .of_match_table = ad5766_dt_match, + }, + .probe = ad5766_probe, + .id_table = ad5766_spi_ids, +}; +module_spi_driver(ad5766_driver); + +MODULE_AUTHOR("Denis-Gabriel Gheorghescu <denis.gheorghescu@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices AD5766/AD5767 DACs"); +MODULE_LICENSE("GPL v2"); -- 2.17.1
