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path: root/drivers/iio/adc/nct7201.c
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Diffstat (limited to 'drivers/iio/adc/nct7201.c')
-rw-r--r--drivers/iio/adc/nct7201.c501
1 files changed, 501 insertions, 0 deletions
diff --git a/drivers/iio/adc/nct7201.c b/drivers/iio/adc/nct7201.c
new file mode 100644
index 000000000000..d87824e5490f
--- /dev/null
+++ b/drivers/iio/adc/nct7201.c
@@ -0,0 +1,501 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Nuvoton nct7201 and nct7202 power monitor chips.
+ *
+ * Copyright (c) 2024-2025 Nuvoton Technology corporation.
+ */
+
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/time.h>
+#include <linux/types.h>
+#include <linux/unaligned.h>
+
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+
+#define NCT7201_REG_INTERRUPT_STATUS 0x0C
+#define NCT7201_REG_VOLT_LOW_BYTE 0x0F
+#define NCT7201_REG_CONFIGURATION 0x10
+#define NCT7201_BIT_CONFIGURATION_START BIT(0)
+#define NCT7201_BIT_CONFIGURATION_ALERT_MSK BIT(1)
+#define NCT7201_BIT_CONFIGURATION_CONV_RATE BIT(2)
+#define NCT7201_BIT_CONFIGURATION_RESET BIT(7)
+
+#define NCT7201_REG_ADVANCED_CONFIGURATION 0x11
+#define NCT7201_BIT_ADVANCED_CONF_MOD_ALERT BIT(0)
+#define NCT7201_BIT_ADVANCED_CONF_MOD_STS BIT(1)
+#define NCT7201_BIT_ADVANCED_CONF_FAULT_QUEUE BIT(2)
+#define NCT7201_BIT_ADVANCED_CONF_EN_DEEP_SHUTDOWN BIT(4)
+#define NCT7201_BIT_ADVANCED_CONF_EN_SMB_TIMEOUT BIT(5)
+#define NCT7201_BIT_ADVANCED_CONF_MOD_RSTIN BIT(7)
+
+#define NCT7201_REG_CHANNEL_INPUT_MODE 0x12
+#define NCT7201_REG_CHANNEL_ENABLE 0x13
+#define NCT7201_REG_INTERRUPT_MASK_1 0x15
+#define NCT7201_REG_INTERRUPT_MASK_2 0x16
+#define NCT7201_REG_BUSY_STATUS 0x1E
+#define NCT7201_BIT_BUSY BIT(0)
+#define NCT7201_BIT_PWR_UP BIT(1)
+#define NCT7201_REG_ONE_SHOT 0x1F
+#define NCT7201_REG_SMUS_ADDRESS 0xFC
+#define NCT7201_REG_VIN_MASK GENMASK(15, 3)
+
+#define NCT7201_REG_VIN(i) (0x00 + i)
+#define NCT7201_REG_VIN_HIGH_LIMIT(i) (0x20 + (i) * 2)
+#define NCT7201_REG_VIN_LOW_LIMIT(i) (0x21 + (i) * 2)
+#define NCT7201_MAX_CHANNEL 12
+
+static const struct regmap_range nct7201_read_reg_range[] = {
+ regmap_reg_range(NCT7201_REG_INTERRUPT_STATUS, NCT7201_REG_BUSY_STATUS),
+ regmap_reg_range(NCT7201_REG_SMUS_ADDRESS, NCT7201_REG_SMUS_ADDRESS),
+};
+
+static const struct regmap_access_table nct7201_readable_regs_tbl = {
+ .yes_ranges = nct7201_read_reg_range,
+ .n_yes_ranges = ARRAY_SIZE(nct7201_read_reg_range),
+};
+
+static const struct regmap_range nct7201_write_reg_range[] = {
+ regmap_reg_range(NCT7201_REG_CONFIGURATION, NCT7201_REG_INTERRUPT_MASK_2),
+ regmap_reg_range(NCT7201_REG_ONE_SHOT, NCT7201_REG_ONE_SHOT),
+};
+
+static const struct regmap_access_table nct7201_writeable_regs_tbl = {
+ .yes_ranges = nct7201_write_reg_range,
+ .n_yes_ranges = ARRAY_SIZE(nct7201_write_reg_range),
+};
+
+static const struct regmap_range nct7201_read_vin_reg_range[] = {
+ regmap_reg_range(NCT7201_REG_VIN(0), NCT7201_REG_VIN(NCT7201_MAX_CHANNEL - 1)),
+ regmap_reg_range(NCT7201_REG_VIN_HIGH_LIMIT(0),
+ NCT7201_REG_VIN_LOW_LIMIT(NCT7201_MAX_CHANNEL - 1)),
+};
+
+static const struct regmap_access_table nct7201_readable_vin_regs_tbl = {
+ .yes_ranges = nct7201_read_vin_reg_range,
+ .n_yes_ranges = ARRAY_SIZE(nct7201_read_vin_reg_range),
+};
+
+static const struct regmap_range nct7201_write_vin_reg_range[] = {
+ regmap_reg_range(NCT7201_REG_VIN_HIGH_LIMIT(0),
+ NCT7201_REG_VIN_LOW_LIMIT(NCT7201_MAX_CHANNEL - 1)),
+};
+
+static const struct regmap_access_table nct7201_writeable_vin_regs_tbl = {
+ .yes_ranges = nct7201_write_vin_reg_range,
+ .n_yes_ranges = ARRAY_SIZE(nct7201_write_vin_reg_range),
+};
+
+static const struct regmap_config nct7201_regmap8_config = {
+ .name = "vin-data-read-byte",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .use_single_read = true,
+ .use_single_write = true,
+ .max_register = 0xff,
+ .rd_table = &nct7201_readable_regs_tbl,
+ .wr_table = &nct7201_writeable_regs_tbl,
+};
+
+static const struct regmap_config nct7201_regmap16_config = {
+ .name = "vin-data-read-word",
+ .reg_bits = 8,
+ .val_bits = 16,
+ .max_register = 0xff,
+ .rd_table = &nct7201_readable_vin_regs_tbl,
+ .wr_table = &nct7201_writeable_vin_regs_tbl,
+};
+
+struct nct7201_chip_info {
+ struct regmap *regmap;
+ struct regmap *regmap16;
+ int num_vin_channels;
+ __le16 vin_mask;
+};
+
+struct nct7201_adc_model_data {
+ const char *model_name;
+ const struct iio_chan_spec *channels;
+ unsigned int num_channels;
+ int num_vin_channels;
+};
+
+static const struct iio_event_spec nct7201_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+#define NCT7201_VOLTAGE_CHANNEL(num) \
+ { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = num + 1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .address = num, \
+ .event_spec = nct7201_events, \
+ .num_event_specs = ARRAY_SIZE(nct7201_events), \
+ }
+
+static const struct iio_chan_spec nct7201_channels[] = {
+ NCT7201_VOLTAGE_CHANNEL(0),
+ NCT7201_VOLTAGE_CHANNEL(1),
+ NCT7201_VOLTAGE_CHANNEL(2),
+ NCT7201_VOLTAGE_CHANNEL(3),
+ NCT7201_VOLTAGE_CHANNEL(4),
+ NCT7201_VOLTAGE_CHANNEL(5),
+ NCT7201_VOLTAGE_CHANNEL(6),
+ NCT7201_VOLTAGE_CHANNEL(7),
+};
+
+static const struct iio_chan_spec nct7202_channels[] = {
+ NCT7201_VOLTAGE_CHANNEL(0),
+ NCT7201_VOLTAGE_CHANNEL(1),
+ NCT7201_VOLTAGE_CHANNEL(2),
+ NCT7201_VOLTAGE_CHANNEL(3),
+ NCT7201_VOLTAGE_CHANNEL(4),
+ NCT7201_VOLTAGE_CHANNEL(5),
+ NCT7201_VOLTAGE_CHANNEL(6),
+ NCT7201_VOLTAGE_CHANNEL(7),
+ NCT7201_VOLTAGE_CHANNEL(8),
+ NCT7201_VOLTAGE_CHANNEL(9),
+ NCT7201_VOLTAGE_CHANNEL(10),
+ NCT7201_VOLTAGE_CHANNEL(11),
+};
+
+static int nct7201_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct nct7201_chip_info *chip = iio_priv(indio_dev);
+ unsigned int value;
+ int err;
+
+ if (chan->type != IIO_VOLTAGE)
+ return -EOPNOTSUPP;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ err = regmap_read(chip->regmap16, NCT7201_REG_VIN(chan->address), &value);
+ if (err)
+ return err;
+ *val = FIELD_GET(NCT7201_REG_VIN_MASK, value);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ /* From the datasheet, we have to multiply by 0.0004995 */
+ *val = 0;
+ *val2 = 499500;
+ return IIO_VAL_INT_PLUS_NANO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int nct7201_read_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int *val, int *val2)
+{
+ struct nct7201_chip_info *chip = iio_priv(indio_dev);
+ unsigned int value;
+ int err;
+
+ if (chan->type != IIO_VOLTAGE)
+ return -EOPNOTSUPP;
+
+ if (info != IIO_EV_INFO_VALUE)
+ return -EINVAL;
+
+ if (dir == IIO_EV_DIR_FALLING)
+ err = regmap_read(chip->regmap16, NCT7201_REG_VIN_LOW_LIMIT(chan->address),
+ &value);
+ else
+ err = regmap_read(chip->regmap16, NCT7201_REG_VIN_HIGH_LIMIT(chan->address),
+ &value);
+ if (err)
+ return err;
+
+ *val = FIELD_GET(NCT7201_REG_VIN_MASK, value);
+
+ return IIO_VAL_INT;
+}
+
+static int nct7201_write_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int val, int val2)
+{
+ struct nct7201_chip_info *chip = iio_priv(indio_dev);
+ int err;
+
+ if (chan->type != IIO_VOLTAGE)
+ return -EOPNOTSUPP;
+
+ if (info != IIO_EV_INFO_VALUE)
+ return -EOPNOTSUPP;
+
+ if (dir == IIO_EV_DIR_FALLING)
+ err = regmap_write(chip->regmap16, NCT7201_REG_VIN_LOW_LIMIT(chan->address),
+ FIELD_PREP(NCT7201_REG_VIN_MASK, val));
+ else
+ err = regmap_write(chip->regmap16, NCT7201_REG_VIN_HIGH_LIMIT(chan->address),
+ FIELD_PREP(NCT7201_REG_VIN_MASK, val));
+
+ return err;
+}
+
+static int nct7201_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct nct7201_chip_info *chip = iio_priv(indio_dev);
+
+ if (chan->type != IIO_VOLTAGE)
+ return -EOPNOTSUPP;
+
+ return !!(le16_to_cpu(chip->vin_mask) & BIT(chan->address));
+}
+
+static int nct7201_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ bool state)
+{
+ struct nct7201_chip_info *chip = iio_priv(indio_dev);
+ __le16 mask = cpu_to_le16(BIT(chan->address));
+ int err;
+
+ if (chan->type != IIO_VOLTAGE)
+ return -EOPNOTSUPP;
+
+ if (state)
+ chip->vin_mask |= mask;
+ else
+ chip->vin_mask &= ~mask;
+
+ if (chip->num_vin_channels <= 8)
+ err = regmap_write(chip->regmap, NCT7201_REG_CHANNEL_ENABLE,
+ le16_to_cpu(chip->vin_mask));
+ else
+ err = regmap_bulk_write(chip->regmap, NCT7201_REG_CHANNEL_ENABLE,
+ &chip->vin_mask, sizeof(chip->vin_mask));
+
+ return err;
+}
+
+static const struct iio_info nct7201_info = {
+ .read_raw = nct7201_read_raw,
+ .read_event_config = nct7201_read_event_config,
+ .write_event_config = nct7201_write_event_config,
+ .read_event_value = nct7201_read_event_value,
+ .write_event_value = nct7201_write_event_value,
+};
+
+static const struct iio_info nct7201_info_no_irq = {
+ .read_raw = nct7201_read_raw,
+};
+
+static const struct nct7201_adc_model_data nct7201_model_data = {
+ .model_name = "nct7201",
+ .channels = nct7201_channels,
+ .num_channels = ARRAY_SIZE(nct7201_channels),
+ .num_vin_channels = 8,
+};
+
+static const struct nct7201_adc_model_data nct7202_model_data = {
+ .model_name = "nct7202",
+ .channels = nct7202_channels,
+ .num_channels = ARRAY_SIZE(nct7202_channels),
+ .num_vin_channels = 12,
+};
+
+static int nct7201_init_chip(struct nct7201_chip_info *chip)
+{
+ struct device *dev = regmap_get_device(chip->regmap);
+ __le16 data = cpu_to_le16(GENMASK(chip->num_vin_channels - 1, 0));
+ unsigned int value;
+ int err;
+
+ err = regmap_write(chip->regmap, NCT7201_REG_CONFIGURATION,
+ NCT7201_BIT_CONFIGURATION_RESET);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to reset chip\n");
+
+ /*
+ * After about 25 msecs, the device should be ready and then the power-up
+ * bit will be set to 1.
+ */
+ fsleep(25 * USEC_PER_MSEC);
+
+ err = regmap_read(chip->regmap, NCT7201_REG_BUSY_STATUS, &value);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to read busy status\n");
+ if (!(value & NCT7201_BIT_PWR_UP))
+ return dev_err_probe(dev, -EIO, "Failed to power up after reset\n");
+
+ /* Enable Channels */
+ if (chip->num_vin_channels <= 8)
+ err = regmap_write(chip->regmap, NCT7201_REG_CHANNEL_ENABLE,
+ le16_to_cpu(data));
+ else
+ err = regmap_bulk_write(chip->regmap, NCT7201_REG_CHANNEL_ENABLE,
+ &data, sizeof(data));
+ if (err)
+ return dev_err_probe(dev, err, "Failed to enable channels\n");
+
+ err = regmap_bulk_read(chip->regmap, NCT7201_REG_CHANNEL_ENABLE,
+ &chip->vin_mask, sizeof(chip->vin_mask));
+ if (err)
+ return dev_err_probe(dev, err,
+ "Failed to read channel enable register\n");
+
+ /* Start monitoring if needed */
+ err = regmap_set_bits(chip->regmap, NCT7201_REG_CONFIGURATION,
+ NCT7201_BIT_CONFIGURATION_START);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to start monitoring\n");
+
+ return 0;
+}
+
+static irqreturn_t nct7201_irq_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct nct7201_chip_info *chip = iio_priv(indio_dev);
+ __le16 data;
+ int err;
+
+ err = regmap_bulk_read(chip->regmap, NCT7201_REG_INTERRUPT_STATUS,
+ &data, sizeof(data));
+ if (err)
+ return IRQ_NONE;
+
+ if (data)
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+ 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns(indio_dev));
+
+ return IRQ_HANDLED;
+}
+
+static int nct7201_probe(struct i2c_client *client)
+{
+ const struct nct7201_adc_model_data *model_data;
+ struct device *dev = &client->dev;
+ struct nct7201_chip_info *chip;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ model_data = i2c_get_match_data(client);
+ if (!model_data)
+ return -ENODEV;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
+ if (!indio_dev)
+ return -ENOMEM;
+ chip = iio_priv(indio_dev);
+
+ chip->regmap = devm_regmap_init_i2c(client, &nct7201_regmap8_config);
+ if (IS_ERR(chip->regmap))
+ return dev_err_probe(dev, PTR_ERR(chip->regmap),
+ "Failed to init regmap\n");
+
+ chip->regmap16 = devm_regmap_init_i2c(client, &nct7201_regmap16_config);
+ if (IS_ERR(chip->regmap16))
+ return dev_err_probe(dev, PTR_ERR(chip->regmap16),
+ "Failed to init regmap16\n");
+
+ chip->num_vin_channels = model_data->num_vin_channels;
+
+ ret = nct7201_init_chip(chip);
+ if (ret)
+ return ret;
+
+ indio_dev->name = model_data->model_name;
+ indio_dev->channels = model_data->channels;
+ indio_dev->num_channels = model_data->num_channels;
+ if (client->irq) {
+ /* Enable alert function */
+ ret = regmap_clear_bits(chip->regmap, NCT7201_REG_CONFIGURATION,
+ NCT7201_BIT_CONFIGURATION_ALERT_MSK);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to enable alert function\n");
+
+ ret = devm_request_threaded_irq(dev, client->irq,
+ NULL, nct7201_irq_handler,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ client->name, indio_dev);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to assign interrupt.\n");
+
+ indio_dev->info = &nct7201_info;
+ } else {
+ indio_dev->info = &nct7201_info_no_irq;
+ }
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct i2c_device_id nct7201_id[] = {
+ { .name = "nct7201", .driver_data = (kernel_ulong_t)&nct7201_model_data },
+ { .name = "nct7202", .driver_data = (kernel_ulong_t)&nct7202_model_data },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, nct7201_id);
+
+static const struct of_device_id nct7201_of_match[] = {
+ {
+ .compatible = "nuvoton,nct7201",
+ .data = &nct7201_model_data,
+ },
+ {
+ .compatible = "nuvoton,nct7202",
+ .data = &nct7202_model_data,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, nct7201_of_match);
+
+static struct i2c_driver nct7201_driver = {
+ .driver = {
+ .name = "nct7201",
+ .of_match_table = nct7201_of_match,
+ },
+ .probe = nct7201_probe,
+ .id_table = nct7201_id,
+};
+module_i2c_driver(nct7201_driver);
+
+MODULE_AUTHOR("Eason Yang <j2anfernee@gmail.com>");
+MODULE_DESCRIPTION("Nuvoton NCT7201 voltage monitor driver");
+MODULE_LICENSE("GPL");
generated by cgit (git 2.34.1) at 2025-07-24 18:18:34 +0000