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-rw-r--r--drivers/iio/addac/ad74115.c1943
1 files changed, 1943 insertions, 0 deletions
diff --git a/drivers/iio/addac/ad74115.c b/drivers/iio/addac/ad74115.c
new file mode 100644
index 0000000000..e6bc5eb378
--- /dev/null
+++ b/drivers/iio/addac/ad74115.c
@@ -0,0 +1,1943 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 Analog Devices, Inc.
+ * Author: Cosmin Tanislav <cosmin.tanislav@analog.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/crc8.h>
+#include <linux/device.h>
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/units.h>
+
+#include <asm/unaligned.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define AD74115_NAME "ad74115"
+
+#define AD74115_CH_FUNC_SETUP_REG 0x01
+
+#define AD74115_ADC_CONFIG_REG 0x02
+#define AD74115_ADC_CONFIG_CONV2_RATE_MASK GENMASK(15, 13)
+#define AD74115_ADC_CONFIG_CONV1_RATE_MASK GENMASK(12, 10)
+#define AD74115_ADC_CONFIG_CONV2_RANGE_MASK GENMASK(9, 7)
+#define AD74115_ADC_CONFIG_CONV1_RANGE_MASK GENMASK(6, 4)
+
+#define AD74115_PWR_OPTIM_CONFIG_REG 0x03
+
+#define AD74115_DIN_CONFIG1_REG 0x04
+#define AD74115_DIN_COMPARATOR_EN_MASK BIT(13)
+#define AD74115_DIN_SINK_MASK GENMASK(11, 7)
+#define AD74115_DIN_DEBOUNCE_MASK GENMASK(4, 0)
+
+#define AD74115_DIN_CONFIG2_REG 0x05
+#define AD74115_COMP_THRESH_MASK GENMASK(6, 0)
+
+#define AD74115_OUTPUT_CONFIG_REG 0x06
+#define AD74115_OUTPUT_SLEW_EN_MASK GENMASK(6, 5)
+#define AD74115_OUTPUT_SLEW_LIN_STEP_MASK GENMASK(4, 3)
+#define AD74115_OUTPUT_SLEW_LIN_RATE_MASK GENMASK(2, 1)
+
+#define AD74115_RTD3W4W_CONFIG_REG 0x07
+
+#define AD74115_BURNOUT_CONFIG_REG 0x0a
+#define AD74115_BURNOUT_EXT2_EN_MASK BIT(10)
+#define AD74115_BURNOUT_EXT1_EN_MASK BIT(5)
+#define AD74115_BURNOUT_VIOUT_EN_MASK BIT(0)
+
+#define AD74115_DAC_CODE_REG 0x0b
+
+#define AD74115_DAC_ACTIVE_REG 0x0d
+
+#define AD74115_GPIO_CONFIG_X_REG(x) (0x35 + (x))
+#define AD74115_GPIO_CONFIG_GPI_DATA BIT(5)
+#define AD74115_GPIO_CONFIG_GPO_DATA BIT(4)
+#define AD74115_GPIO_CONFIG_SELECT_MASK GENMASK(2, 0)
+
+#define AD74115_CHARGE_PUMP_REG 0x3a
+
+#define AD74115_ADC_CONV_CTRL_REG 0x3b
+#define AD74115_ADC_CONV_SEQ_MASK GENMASK(13, 12)
+
+#define AD74115_DIN_COMP_OUT_REG 0x40
+
+#define AD74115_LIVE_STATUS_REG 0x42
+#define AD74115_ADC_DATA_RDY_MASK BIT(3)
+
+#define AD74115_READ_SELECT_REG 0x64
+
+#define AD74115_CMD_KEY_REG 0x78
+#define AD74115_CMD_KEY_RESET1 0x15fa
+#define AD74115_CMD_KEY_RESET2 0xaf51
+
+#define AD74115_CRC_POLYNOMIAL 0x7
+DECLARE_CRC8_TABLE(ad74115_crc8_table);
+
+#define AD74115_ADC_CODE_MAX ((int)GENMASK(15, 0))
+#define AD74115_ADC_CODE_HALF (AD74115_ADC_CODE_MAX / 2)
+
+#define AD74115_DAC_VOLTAGE_MAX 12000
+#define AD74115_DAC_CURRENT_MAX 25
+#define AD74115_DAC_CODE_MAX ((int)GENMASK(13, 0))
+#define AD74115_DAC_CODE_HALF (AD74115_DAC_CODE_MAX / 2)
+
+#define AD74115_COMP_THRESH_MAX 98
+
+#define AD74115_SENSE_RESISTOR_OHMS 100
+#define AD74115_REF_RESISTOR_OHMS 2100
+
+#define AD74115_DIN_SINK_LOW_STEP 120
+#define AD74115_DIN_SINK_HIGH_STEP 240
+#define AD74115_DIN_SINK_MAX 31
+
+#define AD74115_FRAME_SIZE 4
+#define AD74115_GPIO_NUM 4
+
+#define AD74115_CONV_TIME_US 1000000
+
+enum ad74115_dac_ch {
+ AD74115_DAC_CH_MAIN,
+ AD74115_DAC_CH_COMPARATOR,
+};
+
+enum ad74115_adc_ch {
+ AD74115_ADC_CH_CONV1,
+ AD74115_ADC_CH_CONV2,
+ AD74115_ADC_CH_NUM
+};
+
+enum ad74115_ch_func {
+ AD74115_CH_FUNC_HIGH_IMPEDANCE,
+ AD74115_CH_FUNC_VOLTAGE_OUTPUT,
+ AD74115_CH_FUNC_CURRENT_OUTPUT,
+ AD74115_CH_FUNC_VOLTAGE_INPUT,
+ AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER,
+ AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER,
+ AD74115_CH_FUNC_2_WIRE_RESISTANCE_INPUT,
+ AD74115_CH_FUNC_3_4_WIRE_RESISTANCE_INPUT,
+ AD74115_CH_FUNC_DIGITAL_INPUT_LOGIC,
+ AD74115_CH_FUNC_DIGITAL_INPUT_LOOP_POWER,
+ AD74115_CH_FUNC_CURRENT_OUTPUT_HART,
+ AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER_HART,
+ AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART,
+ AD74115_CH_FUNC_MAX = AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART,
+ AD74115_CH_FUNC_NUM
+};
+
+enum ad74115_adc_range {
+ AD74115_ADC_RANGE_12V,
+ AD74115_ADC_RANGE_12V_BIPOLAR,
+ AD74115_ADC_RANGE_2_5V_BIPOLAR,
+ AD74115_ADC_RANGE_2_5V_NEG,
+ AD74115_ADC_RANGE_2_5V,
+ AD74115_ADC_RANGE_0_625V,
+ AD74115_ADC_RANGE_104MV_BIPOLAR,
+ AD74115_ADC_RANGE_12V_OTHER,
+ AD74115_ADC_RANGE_MAX = AD74115_ADC_RANGE_12V_OTHER,
+ AD74115_ADC_RANGE_NUM
+};
+
+enum ad74115_adc_conv_seq {
+ AD74115_ADC_CONV_SEQ_STANDBY = 0b00,
+ AD74115_ADC_CONV_SEQ_SINGLE = 0b01,
+ AD74115_ADC_CONV_SEQ_CONTINUOUS = 0b10,
+};
+
+enum ad74115_din_threshold_mode {
+ AD74115_DIN_THRESHOLD_MODE_AVDD,
+ AD74115_DIN_THRESHOLD_MODE_FIXED,
+ AD74115_DIN_THRESHOLD_MODE_MAX = AD74115_DIN_THRESHOLD_MODE_FIXED,
+};
+
+enum ad74115_slew_mode {
+ AD74115_SLEW_MODE_DISABLED,
+ AD74115_SLEW_MODE_LINEAR,
+ AD74115_SLEW_MODE_HART,
+};
+
+enum ad74115_slew_step {
+ AD74115_SLEW_STEP_0_8_PERCENT,
+ AD74115_SLEW_STEP_1_5_PERCENT,
+ AD74115_SLEW_STEP_6_1_PERCENT,
+ AD74115_SLEW_STEP_22_2_PERCENT,
+};
+
+enum ad74115_slew_rate {
+ AD74115_SLEW_RATE_4KHZ,
+ AD74115_SLEW_RATE_64KHZ,
+ AD74115_SLEW_RATE_150KHZ,
+ AD74115_SLEW_RATE_240KHZ,
+};
+
+enum ad74115_gpio_config {
+ AD74115_GPIO_CONFIG_OUTPUT_BUFFERED = 0b010,
+ AD74115_GPIO_CONFIG_INPUT = 0b011,
+};
+
+enum ad74115_gpio_mode {
+ AD74115_GPIO_MODE_LOGIC = 1,
+ AD74115_GPIO_MODE_SPECIAL = 2,
+};
+
+struct ad74115_channels {
+ struct iio_chan_spec *channels;
+ unsigned int num_channels;
+};
+
+struct ad74115_state {
+ struct spi_device *spi;
+ struct regmap *regmap;
+ struct iio_trigger *trig;
+ struct regulator *avdd;
+
+ /*
+ * Synchronize consecutive operations when doing a one-shot
+ * conversion and when updating the ADC samples SPI message.
+ */
+ struct mutex lock;
+ struct gpio_chip gc;
+ struct gpio_chip comp_gc;
+ int irq;
+
+ unsigned int avdd_mv;
+ unsigned long gpio_valid_mask;
+ bool dac_bipolar;
+ bool dac_hart_slew;
+ bool rtd_mode_4_wire;
+ enum ad74115_ch_func ch_func;
+ enum ad74115_din_threshold_mode din_threshold_mode;
+
+ struct completion adc_data_completion;
+ struct spi_message adc_samples_msg;
+ struct spi_transfer adc_samples_xfer[AD74115_ADC_CH_NUM + 1];
+
+ /*
+ * DMA (thus cache coherency maintenance) requires the
+ * transfer buffers to live in their own cache lines.
+ */
+ u8 reg_tx_buf[AD74115_FRAME_SIZE] __aligned(IIO_DMA_MINALIGN);
+ u8 reg_rx_buf[AD74115_FRAME_SIZE];
+ u8 adc_samples_tx_buf[AD74115_FRAME_SIZE * AD74115_ADC_CH_NUM];
+ u8 adc_samples_rx_buf[AD74115_FRAME_SIZE * AD74115_ADC_CH_NUM];
+};
+
+struct ad74115_fw_prop {
+ const char *name;
+ bool is_boolean;
+ bool negate;
+ unsigned int max;
+ unsigned int reg;
+ unsigned int mask;
+ const unsigned int *lookup_tbl;
+ unsigned int lookup_tbl_len;
+};
+
+#define AD74115_FW_PROP(_name, _max, _reg, _mask) \
+{ \
+ .name = (_name), \
+ .max = (_max), \
+ .reg = (_reg), \
+ .mask = (_mask), \
+}
+
+#define AD74115_FW_PROP_TBL(_name, _tbl, _reg, _mask) \
+{ \
+ .name = (_name), \
+ .reg = (_reg), \
+ .mask = (_mask), \
+ .lookup_tbl = (_tbl), \
+ .lookup_tbl_len = ARRAY_SIZE(_tbl), \
+}
+
+#define AD74115_FW_PROP_BOOL(_name, _reg, _mask) \
+{ \
+ .name = (_name), \
+ .is_boolean = true, \
+ .reg = (_reg), \
+ .mask = (_mask), \
+}
+
+#define AD74115_FW_PROP_BOOL_NEG(_name, _reg, _mask) \
+{ \
+ .name = (_name), \
+ .is_boolean = true, \
+ .negate = true, \
+ .reg = (_reg), \
+ .mask = (_mask), \
+}
+
+static const int ad74115_dac_rate_tbl[] = {
+ 0,
+ 4 * 8,
+ 4 * 15,
+ 4 * 61,
+ 4 * 222,
+ 64 * 8,
+ 64 * 15,
+ 64 * 61,
+ 64 * 222,
+ 150 * 8,
+ 150 * 15,
+ 150 * 61,
+ 150 * 222,
+ 240 * 8,
+ 240 * 15,
+ 240 * 61,
+ 240 * 222,
+};
+
+static const unsigned int ad74115_dac_rate_step_tbl[][3] = {
+ { AD74115_SLEW_MODE_DISABLED },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_4KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_4KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_4KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_4KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_64KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_64KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_64KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_64KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_150KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_150KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_150KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_150KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_240KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_240KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_240KHZ },
+ { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_240KHZ },
+};
+
+static const unsigned int ad74115_rtd_excitation_current_ua_tbl[] = {
+ 250, 500, 750, 1000
+};
+
+static const unsigned int ad74115_burnout_current_na_tbl[] = {
+ 0, 50, 0, 500, 1000, 0, 10000, 0
+};
+
+static const unsigned int ad74115_viout_burnout_current_na_tbl[] = {
+ 0, 0, 0, 0, 1000, 0, 10000, 0
+};
+
+static const unsigned int ad74115_gpio_mode_tbl[] = {
+ 0, 0, 0, 1, 2, 3, 4, 5
+};
+
+static const unsigned int ad74115_adc_conv_rate_tbl[] = {
+ 10, 20, 1200, 4800, 9600
+};
+
+static const unsigned int ad74115_debounce_tbl[] = {
+ 0, 13, 18, 24, 32, 42, 56, 75,
+ 100, 130, 180, 240, 320, 420, 560, 750,
+ 1000, 1300, 1800, 2400, 3200, 4200, 5600, 7500,
+ 10000, 13000, 18000, 24000, 32000, 42000, 56000, 75000,
+};
+
+static const unsigned int ad74115_adc_ch_data_regs_tbl[] = {
+ [AD74115_ADC_CH_CONV1] = 0x44,
+ [AD74115_ADC_CH_CONV2] = 0x46,
+};
+
+static const unsigned int ad74115_adc_ch_en_bit_tbl[] = {
+ [AD74115_ADC_CH_CONV1] = BIT(0),
+ [AD74115_ADC_CH_CONV2] = BIT(1),
+};
+
+static const bool ad74115_adc_bipolar_tbl[AD74115_ADC_RANGE_NUM] = {
+ [AD74115_ADC_RANGE_12V_BIPOLAR] = true,
+ [AD74115_ADC_RANGE_2_5V_BIPOLAR] = true,
+ [AD74115_ADC_RANGE_104MV_BIPOLAR] = true,
+};
+
+static const unsigned int ad74115_adc_conv_mul_tbl[AD74115_ADC_RANGE_NUM] = {
+ [AD74115_ADC_RANGE_12V] = 12000,
+ [AD74115_ADC_RANGE_12V_BIPOLAR] = 24000,
+ [AD74115_ADC_RANGE_2_5V_BIPOLAR] = 5000,
+ [AD74115_ADC_RANGE_2_5V_NEG] = 2500,
+ [AD74115_ADC_RANGE_2_5V] = 2500,
+ [AD74115_ADC_RANGE_0_625V] = 625,
+ [AD74115_ADC_RANGE_104MV_BIPOLAR] = 208,
+ [AD74115_ADC_RANGE_12V_OTHER] = 12000,
+};
+
+static const unsigned int ad74115_adc_gain_tbl[AD74115_ADC_RANGE_NUM][2] = {
+ [AD74115_ADC_RANGE_12V] = { 5, 24 },
+ [AD74115_ADC_RANGE_12V_BIPOLAR] = { 5, 24 },
+ [AD74115_ADC_RANGE_2_5V_BIPOLAR] = { 1, 1 },
+ [AD74115_ADC_RANGE_2_5V_NEG] = { 1, 1 },
+ [AD74115_ADC_RANGE_2_5V] = { 1, 1 },
+ [AD74115_ADC_RANGE_0_625V] = { 4, 1 },
+ [AD74115_ADC_RANGE_104MV_BIPOLAR] = { 24, 1 },
+ [AD74115_ADC_RANGE_12V_OTHER] = { 5, 24 },
+};
+
+static const int ad74115_adc_range_tbl[AD74115_ADC_RANGE_NUM][2] = {
+ [AD74115_ADC_RANGE_12V] = { 0, 12000000 },
+ [AD74115_ADC_RANGE_12V_BIPOLAR] = { -12000000, 12000000 },
+ [AD74115_ADC_RANGE_2_5V_BIPOLAR] = { -2500000, 2500000 },
+ [AD74115_ADC_RANGE_2_5V_NEG] = { -2500000, 0 },
+ [AD74115_ADC_RANGE_2_5V] = { 0, 2500000 },
+ [AD74115_ADC_RANGE_0_625V] = { 0, 625000 },
+ [AD74115_ADC_RANGE_104MV_BIPOLAR] = { -104000, 104000 },
+ [AD74115_ADC_RANGE_12V_OTHER] = { 0, 12000000 },
+};
+
+static int _ad74115_find_tbl_index(const unsigned int *tbl, unsigned int tbl_len,
+ unsigned int val, unsigned int *index)
+{
+ unsigned int i;
+
+ for (i = 0; i < tbl_len; i++)
+ if (val == tbl[i]) {
+ *index = i;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+#define ad74115_find_tbl_index(tbl, val, index) \
+ _ad74115_find_tbl_index(tbl, ARRAY_SIZE(tbl), val, index)
+
+static int ad74115_crc(u8 *buf)
+{
+ return crc8(ad74115_crc8_table, buf, 3, 0);
+}
+
+static void ad74115_format_reg_write(u8 reg, u16 val, u8 *buf)
+{
+ buf[0] = reg;
+ put_unaligned_be16(val, &buf[1]);
+ buf[3] = ad74115_crc(buf);
+}
+
+static int ad74115_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct ad74115_state *st = context;
+
+ ad74115_format_reg_write(reg, val, st->reg_tx_buf);
+
+ return spi_write(st->spi, st->reg_tx_buf, AD74115_FRAME_SIZE);
+}
+
+static int ad74115_crc_check(struct ad74115_state *st, u8 *buf)
+{
+ struct device *dev = &st->spi->dev;
+ u8 expected_crc = ad74115_crc(buf);
+
+ if (buf[3] != expected_crc) {
+ dev_err(dev, "Bad CRC %02x for %02x%02x%02x, expected %02x\n",
+ buf[3], buf[0], buf[1], buf[2], expected_crc);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ad74115_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct ad74115_state *st = context;
+ struct spi_transfer reg_read_xfer[] = {
+ {
+ .tx_buf = st->reg_tx_buf,
+ .len = sizeof(st->reg_tx_buf),
+ .cs_change = 1,
+ },
+ {
+ .rx_buf = st->reg_rx_buf,
+ .len = sizeof(st->reg_rx_buf),
+ },
+ };
+ int ret;
+
+ ad74115_format_reg_write(AD74115_READ_SELECT_REG, reg, st->reg_tx_buf);
+
+ ret = spi_sync_transfer(st->spi, reg_read_xfer, ARRAY_SIZE(reg_read_xfer));
+ if (ret)
+ return ret;
+
+ ret = ad74115_crc_check(st, st->reg_rx_buf);
+ if (ret)
+ return ret;
+
+ *val = get_unaligned_be16(&st->reg_rx_buf[1]);
+
+ return 0;
+}
+
+static const struct regmap_config ad74115_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .reg_read = ad74115_reg_read,
+ .reg_write = ad74115_reg_write,
+};
+
+static int ad74115_gpio_config_set(struct ad74115_state *st, unsigned int offset,
+ enum ad74115_gpio_config cfg)
+{
+ return regmap_update_bits(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset),
+ AD74115_GPIO_CONFIG_SELECT_MASK,
+ FIELD_PREP(AD74115_GPIO_CONFIG_SELECT_MASK, cfg));
+}
+
+static int ad74115_gpio_init_valid_mask(struct gpio_chip *gc,
+ unsigned long *valid_mask,
+ unsigned int ngpios)
+{
+ struct ad74115_state *st = gpiochip_get_data(gc);
+
+ *valid_mask = st->gpio_valid_mask;
+
+ return 0;
+}
+
+static int ad74115_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct ad74115_state *st = gpiochip_get_data(gc);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset), &val);
+ if (ret)
+ return ret;
+
+ return FIELD_GET(AD74115_GPIO_CONFIG_SELECT_MASK, val) == AD74115_GPIO_CONFIG_INPUT;
+}
+
+static int ad74115_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
+{
+ struct ad74115_state *st = gpiochip_get_data(gc);
+
+ return ad74115_gpio_config_set(st, offset, AD74115_GPIO_CONFIG_INPUT);
+}
+
+static int ad74115_gpio_direction_output(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct ad74115_state *st = gpiochip_get_data(gc);
+
+ return ad74115_gpio_config_set(st, offset, AD74115_GPIO_CONFIG_OUTPUT_BUFFERED);
+}
+
+static int ad74115_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct ad74115_state *st = gpiochip_get_data(gc);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset), &val);
+ if (ret)
+ return ret;
+
+ return FIELD_GET(AD74115_GPIO_CONFIG_GPI_DATA, val);
+}
+
+static void ad74115_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
+{
+ struct ad74115_state *st = gpiochip_get_data(gc);
+ struct device *dev = &st->spi->dev;
+ int ret;
+
+ ret = regmap_update_bits(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset),
+ AD74115_GPIO_CONFIG_GPO_DATA,
+ FIELD_PREP(AD74115_GPIO_CONFIG_GPO_DATA, value));
+ if (ret)
+ dev_err(dev, "Failed to set GPIO %u output value, err: %d\n",
+ offset, ret);
+}
+
+static int ad74115_set_comp_debounce(struct ad74115_state *st, unsigned int val)
+{
+ unsigned int len = ARRAY_SIZE(ad74115_debounce_tbl);
+ unsigned int i;
+
+ for (i = 0; i < len; i++)
+ if (val <= ad74115_debounce_tbl[i])
+ break;
+
+ if (i == len)
+ i = len - 1;
+
+ return regmap_update_bits(st->regmap, AD74115_DIN_CONFIG1_REG,
+ AD74115_DIN_DEBOUNCE_MASK,
+ FIELD_PREP(AD74115_DIN_DEBOUNCE_MASK, val));
+}
+
+static int ad74115_comp_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int ad74115_comp_gpio_set_config(struct gpio_chip *chip,
+ unsigned int offset,
+ unsigned long config)
+{
+ struct ad74115_state *st = gpiochip_get_data(chip);
+ u32 param = pinconf_to_config_param(config);
+ u32 arg = pinconf_to_config_argument(config);
+
+ switch (param) {
+ case PIN_CONFIG_INPUT_DEBOUNCE:
+ return ad74115_set_comp_debounce(st, arg);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ad74115_comp_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct ad74115_state *st = gpiochip_get_data(chip);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74115_DIN_COMP_OUT_REG, &val);
+ if (ret)
+ return ret;
+
+ return !!val;
+}
+
+static irqreturn_t ad74115_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ad74115_state *st = iio_priv(indio_dev);
+ int ret;
+
+ ret = spi_sync(st->spi, &st->adc_samples_msg);
+ if (ret)
+ goto out;
+
+ iio_push_to_buffers(indio_dev, st->adc_samples_rx_buf);
+
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ad74115_adc_data_interrupt(int irq, void *data)
+{
+ struct iio_dev *indio_dev = data;
+ struct ad74115_state *st = iio_priv(indio_dev);
+
+ if (iio_buffer_enabled(indio_dev))
+ iio_trigger_poll(st->trig);
+ else
+ complete(&st->adc_data_completion);
+
+ return IRQ_HANDLED;
+}
+
+static int ad74115_set_adc_ch_en(struct ad74115_state *st,
+ enum ad74115_adc_ch channel, bool status)
+{
+ unsigned int mask = ad74115_adc_ch_en_bit_tbl[channel];
+
+ return regmap_update_bits(st->regmap, AD74115_ADC_CONV_CTRL_REG, mask,
+ status ? mask : 0);
+}
+
+static int ad74115_set_adc_conv_seq(struct ad74115_state *st,
+ enum ad74115_adc_conv_seq conv_seq)
+{
+ return regmap_update_bits(st->regmap, AD74115_ADC_CONV_CTRL_REG,
+ AD74115_ADC_CONV_SEQ_MASK,
+ FIELD_PREP(AD74115_ADC_CONV_SEQ_MASK, conv_seq));
+}
+
+static int ad74115_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *active_scan_mask)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+ struct spi_transfer *xfer = st->adc_samples_xfer;
+ u8 *rx_buf = st->adc_samples_rx_buf;
+ u8 *tx_buf = st->adc_samples_tx_buf;
+ unsigned int i;
+ int ret = 0;
+
+ mutex_lock(&st->lock);
+
+ spi_message_init(&st->adc_samples_msg);
+
+ for_each_clear_bit(i, active_scan_mask, AD74115_ADC_CH_NUM) {
+ ret = ad74115_set_adc_ch_en(st, i, false);
+ if (ret)
+ goto out;
+ }
+
+ /*
+ * The read select register is used to select which register's value
+ * will be sent by the slave on the next SPI frame.
+ *
+ * Create an SPI message that, on each step, writes to the read select
+ * register to select the ADC result of the next enabled channel, and
+ * reads the ADC result of the previous enabled channel.
+ *
+ * Example:
+ * W: [WCH1] [WCH2] [WCH2] [WCH3] [ ]
+ * R: [ ] [RCH1] [RCH2] [RCH3] [RCH4]
+ */
+ for_each_set_bit(i, active_scan_mask, AD74115_ADC_CH_NUM) {
+ ret = ad74115_set_adc_ch_en(st, i, true);
+ if (ret)
+ goto out;
+
+ if (xfer == st->adc_samples_xfer)
+ xfer->rx_buf = NULL;
+ else
+ xfer->rx_buf = rx_buf;
+
+ xfer->tx_buf = tx_buf;
+ xfer->len = AD74115_FRAME_SIZE;
+ xfer->cs_change = 1;
+
+ ad74115_format_reg_write(AD74115_READ_SELECT_REG,
+ ad74115_adc_ch_data_regs_tbl[i], tx_buf);
+
+ spi_message_add_tail(xfer, &st->adc_samples_msg);
+
+ tx_buf += AD74115_FRAME_SIZE;
+ if (xfer != st->adc_samples_xfer)
+ rx_buf += AD74115_FRAME_SIZE;
+ xfer++;
+ }
+
+ xfer->rx_buf = rx_buf;
+ xfer->tx_buf = NULL;
+ xfer->len = AD74115_FRAME_SIZE;
+ xfer->cs_change = 0;
+
+ spi_message_add_tail(xfer, &st->adc_samples_msg);
+
+out:
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static int ad74115_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+
+ return ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_CONTINUOUS);
+}
+
+static int ad74115_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+ unsigned int i;
+ int ret;
+
+ mutex_lock(&st->lock);
+
+ ret = ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_STANDBY);
+ if (ret)
+ goto out;
+
+ /*
+ * update_scan_mode() is not called in the disable path, disable all
+ * channels here.
+ */
+ for (i = 0; i < AD74115_ADC_CH_NUM; i++) {
+ ret = ad74115_set_adc_ch_en(st, i, false);
+ if (ret)
+ goto out;
+ }
+
+out:
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static const struct iio_buffer_setup_ops ad74115_buffer_ops = {
+ .postenable = &ad74115_buffer_postenable,
+ .predisable = &ad74115_buffer_predisable,
+};
+
+static const struct iio_trigger_ops ad74115_trigger_ops = {
+ .validate_device = iio_trigger_validate_own_device,
+};
+
+static int ad74115_get_adc_rate(struct ad74115_state *st,
+ enum ad74115_adc_ch channel, int *val)
+{
+ unsigned int i;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74115_ADC_CONFIG_REG, &i);
+ if (ret)
+ return ret;
+
+ if (channel == AD74115_ADC_CH_CONV1)
+ i = FIELD_GET(AD74115_ADC_CONFIG_CONV1_RATE_MASK, i);
+ else
+ i = FIELD_GET(AD74115_ADC_CONFIG_CONV2_RATE_MASK, i);
+
+ *val = ad74115_adc_conv_rate_tbl[i];
+
+ return IIO_VAL_INT;
+}
+
+static int _ad74115_get_adc_code(struct ad74115_state *st,
+ enum ad74115_adc_ch channel, int *val)
+{
+ unsigned int uval;
+ int ret;
+
+ reinit_completion(&st->adc_data_completion);
+
+ ret = ad74115_set_adc_ch_en(st, channel, true);
+ if (ret)
+ return ret;
+
+ ret = ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_SINGLE);
+ if (ret)
+ return ret;
+
+ if (st->irq) {
+ ret = wait_for_completion_timeout(&st->adc_data_completion,
+ msecs_to_jiffies(1000));
+ if (!ret)
+ return -ETIMEDOUT;
+ } else {
+ unsigned int regval, wait_time;
+ int rate;
+
+ ret = ad74115_get_adc_rate(st, channel, &rate);
+ if (ret < 0)
+ return ret;
+
+ wait_time = DIV_ROUND_CLOSEST(AD74115_CONV_TIME_US, rate);
+
+ ret = regmap_read_poll_timeout(st->regmap, AD74115_LIVE_STATUS_REG,
+ regval, regval & AD74115_ADC_DATA_RDY_MASK,
+ wait_time, 5 * wait_time);
+ if (ret)
+ return ret;
+
+ /*
+ * The ADC_DATA_RDY bit is W1C.
+ * See datasheet page 98, Table 62. Bit Descriptions for
+ * LIVE_STATUS.
+ * Although the datasheet mentions that the bit will auto-clear
+ * when writing to the ADC_CONV_CTRL register, this does not
+ * seem to happen.
+ */
+ ret = regmap_write_bits(st->regmap, AD74115_LIVE_STATUS_REG,
+ AD74115_ADC_DATA_RDY_MASK,
+ FIELD_PREP(AD74115_ADC_DATA_RDY_MASK, 1));
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_read(st->regmap, ad74115_adc_ch_data_regs_tbl[channel], &uval);
+ if (ret)
+ return ret;
+
+ ret = ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_STANDBY);
+ if (ret)
+ return ret;
+
+ ret = ad74115_set_adc_ch_en(st, channel, false);
+ if (ret)
+ return ret;
+
+ *val = uval;
+
+ return IIO_VAL_INT;
+}
+
+static int ad74115_get_adc_code(struct iio_dev *indio_dev,
+ enum ad74115_adc_ch channel, int *val)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+ int ret;
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ mutex_lock(&st->lock);
+ ret = _ad74115_get_adc_code(st, channel, val);
+ mutex_unlock(&st->lock);
+
+ iio_device_release_direct_mode(indio_dev);
+
+ return ret;
+}
+
+static int ad74115_adc_code_to_resistance(int code, int *val, int *val2)
+{
+ if (code == AD74115_ADC_CODE_MAX)
+ code--;
+
+ *val = code * AD74115_REF_RESISTOR_OHMS;
+ *val2 = AD74115_ADC_CODE_MAX - code;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74115_set_dac_code(struct ad74115_state *st,
+ enum ad74115_dac_ch channel, int val)
+{
+ if (val < 0)
+ return -EINVAL;
+
+ if (channel == AD74115_DAC_CH_COMPARATOR) {
+ if (val > AD74115_COMP_THRESH_MAX)
+ return -EINVAL;
+
+ return regmap_update_bits(st->regmap, AD74115_DIN_CONFIG2_REG,
+ AD74115_COMP_THRESH_MASK,
+ FIELD_PREP(AD74115_COMP_THRESH_MASK, val));
+ }
+
+ if (val > AD74115_DAC_CODE_MAX)
+ return -EINVAL;
+
+ return regmap_write(st->regmap, AD74115_DAC_CODE_REG, val);
+}
+
+static int ad74115_get_dac_code(struct ad74115_state *st,
+ enum ad74115_dac_ch channel, int *val)
+{
+ unsigned int uval;
+ int ret;
+
+ if (channel == AD74115_DAC_CH_COMPARATOR)
+ return -EINVAL;
+
+ ret = regmap_read(st->regmap, AD74115_DAC_ACTIVE_REG, &uval);
+ if (ret)
+ return ret;
+
+ *val = uval;
+
+ return IIO_VAL_INT;
+}
+
+static int ad74115_set_adc_rate(struct ad74115_state *st,
+ enum ad74115_adc_ch channel, int val)
+{
+ unsigned int i;
+ int ret;
+
+ ret = ad74115_find_tbl_index(ad74115_adc_conv_rate_tbl, val, &i);
+ if (ret)
+ return ret;
+
+ if (channel == AD74115_ADC_CH_CONV1)
+ return regmap_update_bits(st->regmap, AD74115_ADC_CONFIG_REG,
+ AD74115_ADC_CONFIG_CONV1_RATE_MASK,
+ FIELD_PREP(AD74115_ADC_CONFIG_CONV1_RATE_MASK, i));
+
+ return regmap_update_bits(st->regmap, AD74115_ADC_CONFIG_REG,
+ AD74115_ADC_CONFIG_CONV2_RATE_MASK,
+ FIELD_PREP(AD74115_ADC_CONFIG_CONV2_RATE_MASK, i));
+}
+
+static int ad74115_get_dac_rate(struct ad74115_state *st, int *val)
+{
+ unsigned int i, en_val, step_val, rate_val, tmp;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74115_OUTPUT_CONFIG_REG, &tmp);
+ if (ret)
+ return ret;
+
+ en_val = FIELD_GET(AD74115_OUTPUT_SLEW_EN_MASK, tmp);
+ step_val = FIELD_GET(AD74115_OUTPUT_SLEW_LIN_STEP_MASK, tmp);
+ rate_val = FIELD_GET(AD74115_OUTPUT_SLEW_LIN_RATE_MASK, tmp);
+
+ for (i = 0; i < ARRAY_SIZE(ad74115_dac_rate_step_tbl); i++)
+ if (en_val == ad74115_dac_rate_step_tbl[i][0] &&
+ step_val == ad74115_dac_rate_step_tbl[i][1] &&
+ rate_val == ad74115_dac_rate_step_tbl[i][2])
+ break;
+
+ if (i == ARRAY_SIZE(ad74115_dac_rate_step_tbl))
+ return -EINVAL;
+
+ *val = ad74115_dac_rate_tbl[i];
+
+ return IIO_VAL_INT;
+}
+
+static int ad74115_set_dac_rate(struct ad74115_state *st, int val)
+{
+ unsigned int i, en_val, step_val, rate_val, mask, tmp;
+ int ret;
+
+ ret = ad74115_find_tbl_index(ad74115_dac_rate_tbl, val, &i);
+ if (ret)
+ return ret;
+
+ en_val = ad74115_dac_rate_step_tbl[i][0];
+ step_val = ad74115_dac_rate_step_tbl[i][1];
+ rate_val = ad74115_dac_rate_step_tbl[i][2];
+
+ mask = AD74115_OUTPUT_SLEW_EN_MASK;
+ mask |= AD74115_OUTPUT_SLEW_LIN_STEP_MASK;
+ mask |= AD74115_OUTPUT_SLEW_LIN_RATE_MASK;
+
+ tmp = FIELD_PREP(AD74115_OUTPUT_SLEW_EN_MASK, en_val);
+ tmp |= FIELD_PREP(AD74115_OUTPUT_SLEW_LIN_STEP_MASK, step_val);
+ tmp |= FIELD_PREP(AD74115_OUTPUT_SLEW_LIN_RATE_MASK, rate_val);
+
+ return regmap_update_bits(st->regmap, AD74115_OUTPUT_CONFIG_REG, mask, tmp);
+}
+
+static int ad74115_get_dac_scale(struct ad74115_state *st,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2)
+{
+ if (chan->channel == AD74115_DAC_CH_MAIN) {
+ if (chan->type == IIO_VOLTAGE) {
+ *val = AD74115_DAC_VOLTAGE_MAX;
+
+ if (st->dac_bipolar)
+ *val *= 2;
+
+ } else {
+ *val = AD74115_DAC_CURRENT_MAX;
+ }
+
+ *val2 = AD74115_DAC_CODE_MAX;
+ } else {
+ if (st->din_threshold_mode == AD74115_DIN_THRESHOLD_MODE_AVDD) {
+ *val = 196 * st->avdd_mv;
+ *val2 = 10 * AD74115_COMP_THRESH_MAX;
+ } else {
+ *val = 49000;
+ *val2 = AD74115_COMP_THRESH_MAX;
+ }
+ }
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74115_get_dac_offset(struct ad74115_state *st,
+ struct iio_chan_spec const *chan, int *val)
+{
+ if (chan->channel == AD74115_DAC_CH_MAIN) {
+ if (chan->type == IIO_VOLTAGE && st->dac_bipolar)
+ *val = -AD74115_DAC_CODE_HALF;
+ else
+ *val = 0;
+ } else {
+ if (st->din_threshold_mode == AD74115_DIN_THRESHOLD_MODE_AVDD)
+ *val = -48;
+ else
+ *val = -38;
+ }
+
+ return IIO_VAL_INT;
+}
+
+static int ad74115_get_adc_range(struct ad74115_state *st,
+ enum ad74115_adc_ch channel, unsigned int *val)
+{
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74115_ADC_CONFIG_REG, val);
+ if (ret)
+ return ret;
+
+ if (channel == AD74115_ADC_CH_CONV1)
+ *val = FIELD_GET(AD74115_ADC_CONFIG_CONV1_RANGE_MASK, *val);
+ else
+ *val = FIELD_GET(AD74115_ADC_CONFIG_CONV2_RANGE_MASK, *val);
+
+ return 0;
+}
+
+static int ad74115_get_adc_resistance_scale(struct ad74115_state *st,
+ unsigned int range,
+ int *val, int *val2)
+{
+ *val = ad74115_adc_gain_tbl[range][1] * AD74115_REF_RESISTOR_OHMS;
+ *val2 = ad74115_adc_gain_tbl[range][0];
+
+ if (ad74115_adc_bipolar_tbl[range])
+ *val2 *= AD74115_ADC_CODE_HALF;
+ else
+ *val2 *= AD74115_ADC_CODE_MAX;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74115_get_adc_scale(struct ad74115_state *st,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2)
+{
+ unsigned int range;
+ int ret;
+
+ ret = ad74115_get_adc_range(st, chan->channel, &range);
+ if (ret)
+ return ret;
+
+ if (chan->type == IIO_RESISTANCE)
+ return ad74115_get_adc_resistance_scale(st, range, val, val2);
+
+ *val = ad74115_adc_conv_mul_tbl[range];
+ *val2 = AD74115_ADC_CODE_MAX;
+
+ if (chan->type == IIO_CURRENT)
+ *val2 *= AD74115_SENSE_RESISTOR_OHMS;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74115_get_adc_resistance_offset(struct ad74115_state *st,
+ unsigned int range,
+ int *val, int *val2)
+{
+ unsigned int d = 10 * AD74115_REF_RESISTOR_OHMS
+ * ad74115_adc_gain_tbl[range][1];
+
+ *val = 5;
+
+ if (ad74115_adc_bipolar_tbl[range])
+ *val -= AD74115_ADC_CODE_HALF;
+
+ *val *= d;
+
+ if (!st->rtd_mode_4_wire) {
+ /* Add 0.2 Ohm to the final result for 3-wire RTD. */
+ unsigned int v = 2 * ad74115_adc_gain_tbl[range][0];
+
+ if (ad74115_adc_bipolar_tbl[range])
+ v *= AD74115_ADC_CODE_HALF;
+ else
+ v *= AD74115_ADC_CODE_MAX;
+
+ *val += v;
+ }
+
+ *val2 = d;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74115_get_adc_offset(struct ad74115_state *st,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2)
+{
+ unsigned int range;
+ int ret;
+
+ ret = ad74115_get_adc_range(st, chan->channel, &range);
+ if (ret)
+ return ret;
+
+ if (chan->type == IIO_RESISTANCE)
+ return ad74115_get_adc_resistance_offset(st, range, val, val2);
+
+ if (ad74115_adc_bipolar_tbl[range])
+ *val = -AD74115_ADC_CODE_HALF;
+ else if (range == AD74115_ADC_RANGE_2_5V_NEG)
+ *val = -AD74115_ADC_CODE_MAX;
+ else
+ *val = 0;
+
+ return IIO_VAL_INT;
+}
+
+static int ad74115_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long info)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ if (chan->output)
+ return ad74115_get_dac_code(st, chan->channel, val);
+
+ return ad74115_get_adc_code(indio_dev, chan->channel, val);
+ case IIO_CHAN_INFO_PROCESSED:
+ ret = ad74115_get_adc_code(indio_dev, chan->channel, val);
+ if (ret)
+ return ret;
+
+ return ad74115_adc_code_to_resistance(*val, val, val2);
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->output)
+ return ad74115_get_dac_scale(st, chan, val, val2);
+
+ return ad74115_get_adc_scale(st, chan, val, val2);
+ case IIO_CHAN_INFO_OFFSET:
+ if (chan->output)
+ return ad74115_get_dac_offset(st, chan, val);
+
+ return ad74115_get_adc_offset(st, chan, val, val2);
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (chan->output)
+ return ad74115_get_dac_rate(st, val);
+
+ return ad74115_get_adc_rate(st, chan->channel, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad74115_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val, int val2,
+ long info)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ if (!chan->output)
+ return -EINVAL;
+
+ return ad74115_set_dac_code(st, chan->channel, val);
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (chan->output)
+ return ad74115_set_dac_rate(st, val);
+
+ return ad74115_set_adc_rate(st, chan->channel, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad74115_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length, long info)
+{
+ switch (info) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (chan->output) {
+ *vals = ad74115_dac_rate_tbl;
+ *length = ARRAY_SIZE(ad74115_dac_rate_tbl);
+ } else {
+ *vals = ad74115_adc_conv_rate_tbl;
+ *length = ARRAY_SIZE(ad74115_adc_conv_rate_tbl);
+ }
+
+ *type = IIO_VAL_INT;
+
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad74115_reg_access(struct iio_dev *indio_dev, unsigned int reg,
+ unsigned int writeval, unsigned int *readval)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+
+ if (readval)
+ return regmap_read(st->regmap, reg, readval);
+
+ return regmap_write(st->regmap, reg, writeval);
+}
+
+static const struct iio_info ad74115_info = {
+ .read_raw = ad74115_read_raw,
+ .write_raw = ad74115_write_raw,
+ .read_avail = ad74115_read_avail,
+ .update_scan_mode = ad74115_update_scan_mode,
+ .debugfs_reg_access = ad74115_reg_access,
+};
+
+#define AD74115_DAC_CHANNEL(_type, index) \
+ { \
+ .type = (_type), \
+ .channel = (index), \
+ .indexed = 1, \
+ .output = 1, \
+ .scan_index = -1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \
+ | BIT(IIO_CHAN_INFO_SCALE) \
+ | BIT(IIO_CHAN_INFO_OFFSET), \
+ }
+
+#define _AD74115_ADC_CHANNEL(_type, index, extra_mask_separate) \
+ { \
+ .type = (_type), \
+ .channel = (index), \
+ .indexed = 1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \
+ | BIT(IIO_CHAN_INFO_SAMP_FREQ) \
+ | (extra_mask_separate), \
+ .info_mask_separate_available = \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .scan_index = index, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = 16, \
+ .storagebits = 32, \
+ .shift = 8, \
+ .endianness = IIO_BE, \
+ }, \
+ }
+
+#define AD74115_ADC_CHANNEL(_type, index) \
+ _AD74115_ADC_CHANNEL(_type, index, BIT(IIO_CHAN_INFO_SCALE) \
+ | BIT(IIO_CHAN_INFO_OFFSET))
+
+static struct iio_chan_spec ad74115_voltage_input_channels[] = {
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+static struct iio_chan_spec ad74115_voltage_output_channels[] = {
+ AD74115_DAC_CHANNEL(IIO_VOLTAGE, AD74115_DAC_CH_MAIN),
+ AD74115_ADC_CHANNEL(IIO_CURRENT, AD74115_ADC_CH_CONV1),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+static struct iio_chan_spec ad74115_current_input_channels[] = {
+ AD74115_ADC_CHANNEL(IIO_CURRENT, AD74115_ADC_CH_CONV1),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+static struct iio_chan_spec ad74115_current_output_channels[] = {
+ AD74115_DAC_CHANNEL(IIO_CURRENT, AD74115_DAC_CH_MAIN),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+static struct iio_chan_spec ad74115_2_wire_resistance_input_channels[] = {
+ _AD74115_ADC_CHANNEL(IIO_RESISTANCE, AD74115_ADC_CH_CONV1,
+ BIT(IIO_CHAN_INFO_PROCESSED)),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+static struct iio_chan_spec ad74115_3_4_wire_resistance_input_channels[] = {
+ AD74115_ADC_CHANNEL(IIO_RESISTANCE, AD74115_ADC_CH_CONV1),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+static struct iio_chan_spec ad74115_digital_input_logic_channels[] = {
+ AD74115_DAC_CHANNEL(IIO_VOLTAGE, AD74115_DAC_CH_COMPARATOR),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+static struct iio_chan_spec ad74115_digital_input_loop_channels[] = {
+ AD74115_DAC_CHANNEL(IIO_CURRENT, AD74115_DAC_CH_MAIN),
+ AD74115_DAC_CHANNEL(IIO_VOLTAGE, AD74115_DAC_CH_COMPARATOR),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),
+ AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),
+};
+
+#define _AD74115_CHANNELS(_channels) \
+ { \
+ .channels = _channels, \
+ .num_channels = ARRAY_SIZE(_channels), \
+ }
+
+#define AD74115_CHANNELS(name) \
+ _AD74115_CHANNELS(ad74115_ ## name ## _channels)
+
+static const struct ad74115_channels ad74115_channels_map[AD74115_CH_FUNC_NUM] = {
+ [AD74115_CH_FUNC_HIGH_IMPEDANCE] = AD74115_CHANNELS(voltage_input),
+ [AD74115_CH_FUNC_VOLTAGE_INPUT] = AD74115_CHANNELS(voltage_input),
+
+ [AD74115_CH_FUNC_VOLTAGE_OUTPUT] = AD74115_CHANNELS(voltage_output),
+
+ [AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER] = AD74115_CHANNELS(current_input),
+ [AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER] = AD74115_CHANNELS(current_input),
+ [AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER_HART] = AD74115_CHANNELS(current_input),
+ [AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART] = AD74115_CHANNELS(current_input),
+
+ [AD74115_CH_FUNC_CURRENT_OUTPUT] = AD74115_CHANNELS(current_output),
+ [AD74115_CH_FUNC_CURRENT_OUTPUT_HART] = AD74115_CHANNELS(current_output),
+
+ [AD74115_CH_FUNC_2_WIRE_RESISTANCE_INPUT] = AD74115_CHANNELS(2_wire_resistance_input),
+ [AD74115_CH_FUNC_3_4_WIRE_RESISTANCE_INPUT] = AD74115_CHANNELS(3_4_wire_resistance_input),
+
+ [AD74115_CH_FUNC_DIGITAL_INPUT_LOGIC] = AD74115_CHANNELS(digital_input_logic),
+
+ [AD74115_CH_FUNC_DIGITAL_INPUT_LOOP_POWER] = AD74115_CHANNELS(digital_input_loop),
+};
+
+#define AD74115_GPIO_MODE_FW_PROP(i) \
+{ \
+ .name = "adi,gpio" __stringify(i) "-mode", \
+ .reg = AD74115_GPIO_CONFIG_X_REG(i), \
+ .mask = AD74115_GPIO_CONFIG_SELECT_MASK, \
+ .lookup_tbl = ad74115_gpio_mode_tbl, \
+ .lookup_tbl_len = ARRAY_SIZE(ad74115_gpio_mode_tbl), \
+}
+
+static const struct ad74115_fw_prop ad74115_gpio_mode_fw_props[] = {
+ AD74115_GPIO_MODE_FW_PROP(0),
+ AD74115_GPIO_MODE_FW_PROP(1),
+ AD74115_GPIO_MODE_FW_PROP(2),
+ AD74115_GPIO_MODE_FW_PROP(3),
+};
+
+static const struct ad74115_fw_prop ad74115_din_threshold_mode_fw_prop =
+ AD74115_FW_PROP_BOOL("adi,digital-input-threshold-mode-fixed",
+ AD74115_DIN_CONFIG2_REG, BIT(7));
+
+static const struct ad74115_fw_prop ad74115_dac_bipolar_fw_prop =
+ AD74115_FW_PROP_BOOL("adi,dac-bipolar", AD74115_OUTPUT_CONFIG_REG, BIT(7));
+
+static const struct ad74115_fw_prop ad74115_ch_func_fw_prop =
+ AD74115_FW_PROP("adi,ch-func", AD74115_CH_FUNC_MAX,
+ AD74115_CH_FUNC_SETUP_REG, GENMASK(3, 0));
+
+static const struct ad74115_fw_prop ad74115_rtd_mode_fw_prop =
+ AD74115_FW_PROP_BOOL("adi,4-wire-rtd", AD74115_RTD3W4W_CONFIG_REG, BIT(3));
+
+static const struct ad74115_fw_prop ad74115_din_range_fw_prop =
+ AD74115_FW_PROP_BOOL("adi,digital-input-sink-range-high",
+ AD74115_DIN_CONFIG1_REG, BIT(12));
+
+static const struct ad74115_fw_prop ad74115_ext2_burnout_current_fw_prop =
+ AD74115_FW_PROP_TBL("adi,ext2-burnout-current-nanoamp",
+ ad74115_burnout_current_na_tbl,
+ AD74115_BURNOUT_CONFIG_REG, GENMASK(14, 12));
+
+static const struct ad74115_fw_prop ad74115_ext1_burnout_current_fw_prop =
+ AD74115_FW_PROP_TBL("adi,ext1-burnout-current-nanoamp",
+ ad74115_burnout_current_na_tbl,
+ AD74115_BURNOUT_CONFIG_REG, GENMASK(9, 7));
+
+static const struct ad74115_fw_prop ad74115_viout_burnout_current_fw_prop =
+ AD74115_FW_PROP_TBL("adi,viout-burnout-current-nanoamp",
+ ad74115_viout_burnout_current_na_tbl,
+ AD74115_BURNOUT_CONFIG_REG, GENMASK(4, 2));
+
+static const struct ad74115_fw_prop ad74115_fw_props[] = {
+ AD74115_FW_PROP("adi,conv2-mux", 3,
+ AD74115_ADC_CONFIG_REG, GENMASK(3, 2)),
+
+ AD74115_FW_PROP_BOOL_NEG("adi,sense-agnd-buffer-low-power",
+ AD74115_PWR_OPTIM_CONFIG_REG, BIT(4)),
+ AD74115_FW_PROP_BOOL_NEG("adi,lf-buffer-low-power",
+ AD74115_PWR_OPTIM_CONFIG_REG, BIT(3)),
+ AD74115_FW_PROP_BOOL_NEG("adi,hf-buffer-low-power",
+ AD74115_PWR_OPTIM_CONFIG_REG, BIT(2)),
+ AD74115_FW_PROP_BOOL_NEG("adi,ext2-buffer-low-power",
+ AD74115_PWR_OPTIM_CONFIG_REG, BIT(1)),
+ AD74115_FW_PROP_BOOL_NEG("adi,ext1-buffer-low-power",
+ AD74115_PWR_OPTIM_CONFIG_REG, BIT(0)),
+
+ AD74115_FW_PROP_BOOL("adi,comparator-invert",
+ AD74115_DIN_CONFIG1_REG, BIT(14)),
+ AD74115_FW_PROP_BOOL("adi,digital-input-debounce-mode-counter-reset",
+ AD74115_DIN_CONFIG1_REG, BIT(6)),
+
+ AD74115_FW_PROP_BOOL("adi,digital-input-unbuffered",
+ AD74115_DIN_CONFIG2_REG, BIT(10)),
+ AD74115_FW_PROP_BOOL("adi,digital-input-short-circuit-detection",
+ AD74115_DIN_CONFIG2_REG, BIT(9)),
+ AD74115_FW_PROP_BOOL("adi,digital-input-open-circuit-detection",
+ AD74115_DIN_CONFIG2_REG, BIT(8)),
+
+ AD74115_FW_PROP_BOOL("adi,dac-current-limit-low",
+ AD74115_OUTPUT_CONFIG_REG, BIT(0)),
+
+ AD74115_FW_PROP_BOOL("adi,3-wire-rtd-excitation-swap",
+ AD74115_RTD3W4W_CONFIG_REG, BIT(2)),
+ AD74115_FW_PROP_TBL("adi,rtd-excitation-current-microamp",
+ ad74115_rtd_excitation_current_ua_tbl,
+ AD74115_RTD3W4W_CONFIG_REG, GENMASK(1, 0)),
+
+ AD74115_FW_PROP_BOOL("adi,ext2-burnout-current-polarity-sourcing",
+ AD74115_BURNOUT_CONFIG_REG, BIT(11)),
+ AD74115_FW_PROP_BOOL("adi,ext1-burnout-current-polarity-sourcing",
+ AD74115_BURNOUT_CONFIG_REG, BIT(6)),
+ AD74115_FW_PROP_BOOL("adi,viout-burnout-current-polarity-sourcing",
+ AD74115_BURNOUT_CONFIG_REG, BIT(1)),
+
+ AD74115_FW_PROP_BOOL("adi,charge-pump",
+ AD74115_CHARGE_PUMP_REG, BIT(0)),
+};
+
+static int ad74115_apply_fw_prop(struct ad74115_state *st,
+ const struct ad74115_fw_prop *prop, u32 *retval)
+{
+ struct device *dev = &st->spi->dev;
+ u32 val = 0;
+ int ret;
+
+ if (prop->is_boolean) {
+ val = device_property_read_bool(dev, prop->name);
+ } else {
+ ret = device_property_read_u32(dev, prop->name, &val);
+ if (ret && prop->lookup_tbl)
+ val = prop->lookup_tbl[0];
+ }
+
+ *retval = val;
+
+ if (prop->negate)
+ val = !val;
+
+ if (prop->lookup_tbl)
+ ret = _ad74115_find_tbl_index(prop->lookup_tbl,
+ prop->lookup_tbl_len, val, &val);
+ else if (prop->max && val > prop->max)
+ ret = -EINVAL;
+ else
+ ret = 0;
+
+ if (ret)
+ return dev_err_probe(dev, -EINVAL,
+ "Invalid value %u for prop %s\n",
+ val, prop->name);
+
+ WARN(!prop->mask, "Prop %s mask is empty\n", prop->name);
+
+ val = (val << __ffs(prop->mask)) & prop->mask;
+
+ return regmap_update_bits(st->regmap, prop->reg, prop->mask, val);
+}
+
+static int ad74115_setup_adc_conv2_range(struct ad74115_state *st)
+{
+ unsigned int tbl_len = ARRAY_SIZE(ad74115_adc_range_tbl);
+ const char *prop_name = "adi,conv2-range-microvolt";
+ s32 vals[2] = {
+ ad74115_adc_range_tbl[0][0],
+ ad74115_adc_range_tbl[0][1],
+ };
+ struct device *dev = &st->spi->dev;
+ unsigned int i;
+
+ device_property_read_u32_array(dev, prop_name, vals, 2);
+
+ for (i = 0; i < tbl_len; i++)
+ if (vals[0] == ad74115_adc_range_tbl[i][0] &&
+ vals[1] == ad74115_adc_range_tbl[i][1])
+ break;
+
+ if (i == tbl_len)
+ return dev_err_probe(dev, -EINVAL,
+ "Invalid value %d, %d for prop %s\n",
+ vals[0], vals[1], prop_name);
+
+ return regmap_update_bits(st->regmap, AD74115_ADC_CONFIG_REG,
+ AD74115_ADC_CONFIG_CONV2_RANGE_MASK,
+ FIELD_PREP(AD74115_ADC_CONFIG_CONV2_RANGE_MASK, i));
+}
+
+static int ad74115_setup_iio_channels(struct iio_dev *indio_dev)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+ struct device *dev = &st->spi->dev;
+ struct iio_chan_spec *channels;
+
+ channels = devm_kcalloc(dev, sizeof(*channels),
+ indio_dev->num_channels, GFP_KERNEL);
+ if (!channels)
+ return -ENOMEM;
+
+ indio_dev->channels = channels;
+
+ memcpy(channels, ad74115_channels_map[st->ch_func].channels,
+ sizeof(*channels) * ad74115_channels_map[st->ch_func].num_channels);
+
+ if (channels[0].output && channels[0].channel == AD74115_DAC_CH_MAIN &&
+ channels[0].type == IIO_VOLTAGE && !st->dac_hart_slew) {
+ channels[0].info_mask_separate |= BIT(IIO_CHAN_INFO_SAMP_FREQ);
+ channels[0].info_mask_separate_available |= BIT(IIO_CHAN_INFO_SAMP_FREQ);
+ }
+
+ return 0;
+}
+
+static int ad74115_setup_gpio_chip(struct ad74115_state *st)
+{
+ struct device *dev = &st->spi->dev;
+
+ if (!st->gpio_valid_mask)
+ return 0;
+
+ st->gc = (struct gpio_chip) {
+ .owner = THIS_MODULE,
+ .label = AD74115_NAME,
+ .base = -1,
+ .ngpio = AD74115_GPIO_NUM,
+ .parent = dev,
+ .can_sleep = true,
+ .init_valid_mask = ad74115_gpio_init_valid_mask,
+ .get_direction = ad74115_gpio_get_direction,
+ .direction_input = ad74115_gpio_direction_input,
+ .direction_output = ad74115_gpio_direction_output,
+ .get = ad74115_gpio_get,
+ .set = ad74115_gpio_set,
+ };
+
+ return devm_gpiochip_add_data(dev, &st->gc, st);
+}
+
+static int ad74115_setup_comp_gpio_chip(struct ad74115_state *st)
+{
+ struct device *dev = &st->spi->dev;
+ u32 val;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74115_DIN_CONFIG1_REG, &val);
+ if (ret)
+ return ret;
+
+ if (!(val & AD74115_DIN_COMPARATOR_EN_MASK))
+ return 0;
+
+ st->comp_gc = (struct gpio_chip) {
+ .owner = THIS_MODULE,
+ .label = AD74115_NAME,
+ .base = -1,
+ .ngpio = 1,
+ .parent = dev,
+ .can_sleep = true,
+ .get_direction = ad74115_comp_gpio_get_direction,
+ .get = ad74115_comp_gpio_get,
+ .set_config = ad74115_comp_gpio_set_config,
+ };
+
+ return devm_gpiochip_add_data(dev, &st->comp_gc, st);
+}
+
+static int ad74115_setup(struct iio_dev *indio_dev)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+ struct device *dev = &st->spi->dev;
+ u32 val, din_range_high;
+ unsigned int i;
+ int ret;
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_ch_func_fw_prop, &val);
+ if (ret)
+ return ret;
+
+ indio_dev->num_channels += ad74115_channels_map[val].num_channels;
+ st->ch_func = val;
+
+ ret = ad74115_setup_adc_conv2_range(st);
+ if (ret)
+ return ret;
+
+ val = device_property_read_bool(dev, "adi,dac-hart-slew");
+ if (val) {
+ st->dac_hart_slew = val;
+
+ ret = regmap_update_bits(st->regmap, AD74115_OUTPUT_CONFIG_REG,
+ AD74115_OUTPUT_SLEW_EN_MASK,
+ FIELD_PREP(AD74115_OUTPUT_SLEW_EN_MASK,
+ AD74115_SLEW_MODE_HART));
+ if (ret)
+ return ret;
+ }
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_din_range_fw_prop,
+ &din_range_high);
+ if (ret)
+ return ret;
+
+ ret = device_property_read_u32(dev, "adi,digital-input-sink-microamp", &val);
+ if (!ret) {
+ if (din_range_high)
+ val = DIV_ROUND_CLOSEST(val, AD74115_DIN_SINK_LOW_STEP);
+ else
+ val = DIV_ROUND_CLOSEST(val, AD74115_DIN_SINK_HIGH_STEP);
+
+ if (val > AD74115_DIN_SINK_MAX)
+ val = AD74115_DIN_SINK_MAX;
+
+ ret = regmap_update_bits(st->regmap, AD74115_DIN_CONFIG1_REG,
+ AD74115_DIN_SINK_MASK,
+ FIELD_PREP(AD74115_DIN_SINK_MASK, val));
+ if (ret)
+ return ret;
+ }
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_din_threshold_mode_fw_prop, &val);
+ if (ret)
+ return ret;
+
+ if (val == AD74115_DIN_THRESHOLD_MODE_AVDD) {
+ ret = regulator_get_voltage(st->avdd);
+ if (ret < 0)
+ return ret;
+
+ st->avdd_mv = ret / 1000;
+ }
+
+ st->din_threshold_mode = val;
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_dac_bipolar_fw_prop, &val);
+ if (ret)
+ return ret;
+
+ st->dac_bipolar = val;
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_rtd_mode_fw_prop, &val);
+ if (ret)
+ return ret;
+
+ st->rtd_mode_4_wire = val;
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_ext2_burnout_current_fw_prop, &val);
+ if (ret)
+ return ret;
+
+ if (val) {
+ ret = regmap_update_bits(st->regmap, AD74115_BURNOUT_CONFIG_REG,
+ AD74115_BURNOUT_EXT2_EN_MASK,
+ FIELD_PREP(AD74115_BURNOUT_EXT2_EN_MASK, 1));
+ if (ret)
+ return ret;
+ }
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_ext1_burnout_current_fw_prop, &val);
+ if (ret)
+ return ret;
+
+ if (val) {
+ ret = regmap_update_bits(st->regmap, AD74115_BURNOUT_CONFIG_REG,
+ AD74115_BURNOUT_EXT1_EN_MASK,
+ FIELD_PREP(AD74115_BURNOUT_EXT1_EN_MASK, 1));
+ if (ret)
+ return ret;
+ }
+
+ ret = ad74115_apply_fw_prop(st, &ad74115_viout_burnout_current_fw_prop, &val);
+ if (ret)
+ return ret;
+
+ if (val) {
+ ret = regmap_update_bits(st->regmap, AD74115_BURNOUT_CONFIG_REG,
+ AD74115_BURNOUT_VIOUT_EN_MASK,
+ FIELD_PREP(AD74115_BURNOUT_VIOUT_EN_MASK, 1));
+ if (ret)
+ return ret;
+ }
+
+ for (i = 0; i < AD74115_GPIO_NUM; i++) {
+ ret = ad74115_apply_fw_prop(st, &ad74115_gpio_mode_fw_props[i], &val);
+ if (ret)
+ return ret;
+
+ if (val == AD74115_GPIO_MODE_LOGIC)
+ st->gpio_valid_mask |= BIT(i);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(ad74115_fw_props); i++) {
+ ret = ad74115_apply_fw_prop(st, &ad74115_fw_props[i], &val);
+ if (ret)
+ return ret;
+ }
+
+ ret = ad74115_setup_gpio_chip(st);
+ if (ret)
+ return ret;
+
+ ret = ad74115_setup_comp_gpio_chip(st);
+ if (ret)
+ return ret;
+
+ return ad74115_setup_iio_channels(indio_dev);
+}
+
+static int ad74115_reset(struct ad74115_state *st)
+{
+ struct device *dev = &st->spi->dev;
+ struct gpio_desc *reset_gpio;
+ int ret;
+
+ reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(reset_gpio))
+ return dev_err_probe(dev, PTR_ERR(reset_gpio),
+ "Failed to find reset GPIO\n");
+
+ if (reset_gpio) {
+ fsleep(100);
+
+ gpiod_set_value_cansleep(reset_gpio, 0);
+ } else {
+ ret = regmap_write(st->regmap, AD74115_CMD_KEY_REG,
+ AD74115_CMD_KEY_RESET1);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(st->regmap, AD74115_CMD_KEY_REG,
+ AD74115_CMD_KEY_RESET2);
+ if (ret)
+ return ret;
+ }
+
+ fsleep(1000);
+
+ return 0;
+}
+
+static void ad74115_regulator_disable(void *data)
+{
+ regulator_disable(data);
+}
+
+static int ad74115_setup_trigger(struct iio_dev *indio_dev)
+{
+ struct ad74115_state *st = iio_priv(indio_dev);
+ struct device *dev = &st->spi->dev;
+ int ret;
+
+ st->irq = fwnode_irq_get_byname(dev_fwnode(dev), "adc_rdy");
+
+ if (st->irq == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ if (st->irq < 0) {
+ st->irq = 0;
+ return 0;
+ }
+
+ ret = devm_request_irq(dev, st->irq, ad74115_adc_data_interrupt,
+ 0, AD74115_NAME, indio_dev);
+ if (ret)
+ return ret;
+
+ st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", AD74115_NAME,
+ iio_device_id(indio_dev));
+ if (!st->trig)
+ return -ENOMEM;
+
+ st->trig->ops = &ad74115_trigger_ops;
+ iio_trigger_set_drvdata(st->trig, st);
+
+ ret = devm_iio_trigger_register(dev, st->trig);
+ if (ret)
+ return ret;
+
+ indio_dev->trig = iio_trigger_get(st->trig);
+
+ return 0;
+}
+
+static int ad74115_probe(struct spi_device *spi)
+{
+ static const char * const regulator_names[] = {
+ "avcc", "dvcc", "dovdd", "refin",
+ };
+ struct device *dev = &spi->dev;
+ struct ad74115_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->spi = spi;
+ mutex_init(&st->lock);
+ init_completion(&st->adc_data_completion);
+
+ indio_dev->name = AD74115_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &ad74115_info;
+
+ st->avdd = devm_regulator_get(dev, "avdd");
+ if (IS_ERR(st->avdd))
+ return PTR_ERR(st->avdd);
+
+ ret = regulator_enable(st->avdd);
+ if (ret) {
+ dev_err(dev, "Failed to enable avdd regulator\n");
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(dev, ad74115_regulator_disable, st->avdd);
+ if (ret)
+ return ret;
+
+ ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulator_names),
+ regulator_names);
+ if (ret)
+ return ret;
+
+ st->regmap = devm_regmap_init(dev, NULL, st, &ad74115_regmap_config);
+ if (IS_ERR(st->regmap))
+ return PTR_ERR(st->regmap);
+
+ ret = ad74115_reset(st);
+ if (ret)
+ return ret;
+
+ ret = ad74115_setup(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = ad74115_setup_trigger(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
+ ad74115_trigger_handler,
+ &ad74115_buffer_ops);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static int ad74115_unregister_driver(struct spi_driver *spi)
+{
+ spi_unregister_driver(spi);
+
+ return 0;
+}
+
+static int __init ad74115_register_driver(struct spi_driver *spi)
+{
+ crc8_populate_msb(ad74115_crc8_table, AD74115_CRC_POLYNOMIAL);
+
+ return spi_register_driver(spi);
+}
+
+static const struct spi_device_id ad74115_spi_id[] = {
+ { "ad74115h" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(spi, ad74115_spi_id);
+
+static const struct of_device_id ad74115_dt_id[] = {
+ { .compatible = "adi,ad74115h" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ad74115_dt_id);
+
+static struct spi_driver ad74115_driver = {
+ .driver = {
+ .name = "ad74115",
+ .of_match_table = ad74115_dt_id,
+ },
+ .probe = ad74115_probe,
+ .id_table = ad74115_spi_id,
+};
+
+module_driver(ad74115_driver,
+ ad74115_register_driver, ad74115_unregister_driver);
+
+MODULE_AUTHOR("Cosmin Tanislav <cosmin.tanislav@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD74115 ADDAC");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 08:06:30 +0000