[PATCH v1 7/9] iio: adc: Add Nuvoton NCT6694 IIO support

Ming Yu
2024-10-24T09:00:19Z

This driver supports IIO functionality for NCT6694 MFD device
based on USB interface.

Signed-off-by: Ming Yu <tmyu0@nuvoton.com>
---
MAINTAINERS | 1 +
drivers/iio/adc/Kconfig | 10 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/nct6694_adc.c | 616 ++++++++++++++++++++++++++++++++++
4 files changed, 628 insertions(+)
create mode 100644 drivers/iio/adc/nct6694_adc.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 2aa87ad84156..5c350eac187d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16440,6 +16440,7 @@ L: linux-kernel@vger.kernel.org
S: Supported
F: drivers/gpio/gpio-nct6694.c
F: drivers/hwmon/nct6694-hwmon.c
+F: drivers/iio/adc/nct6694_adc.c
F: drivers/i2c/busses/i2c-nct6694.c
F: drivers/mfd/nct6694.c
F: drivers/net/can/nct6694_canfd.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 6c4e74420fd2..302511d166db 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1018,6 +1018,16 @@ config NPCM_ADC
This driver can also be built as a module. If so, the module
will be called npcm_adc.

+config NCT6694_ADC
+ tristate "Nuvoton NCT6694 ADC driver"
+ depends on MFD_NCT6694
+ help
+ If you say yes to this option, support will be included for Nuvoton
+ NCT6694, a USB device to ADC.
+
+ This driver can also be built as a module. If so, the module
+ will be called nct6694_adc.
+
config PAC1921
tristate "Microchip Technology PAC1921 driver"
depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 7b91cd98c0e0..db419f77365c 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_MP2629_ADC) += mp2629_adc.o
obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
obj-$(CONFIG_NAU7802) += nau7802.o
obj-$(CONFIG_NPCM_ADC) += npcm_adc.o
+obj-$(CONFIG_NCT6694_ADC) += nct6694_adc.o
obj-$(CONFIG_PAC1921) += pac1921.o
obj-$(CONFIG_PAC1934) += pac1934.o
obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
diff --git a/drivers/iio/adc/nct6694_adc.c b/drivers/iio/adc/nct6694_adc.c
new file mode 100644
index 000000000000..de4cddc8addc
--- /dev/null
+++ b/drivers/iio/adc/nct6694_adc.c
@@ -0,0 +1,616 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Nuvoton NCT6694 IIO driver based on USB interface.
+ *
+ * Copyright (C) 2024 Nuvoton Technology Corp.
+ */
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/nct6694.h>
+
+#define DRVNAME "nct6694-iio"
+
+/* Host interface */
+#define REQUEST_RPT_MOD 0xFF
+#define REQUEST_IIO_MOD 0x00
+
+/* Report Channel */
+#define IIO_VIN_STS(x) (0x68 + (x))
+#define IIO_TMP_STS(x) (0x6A + (x))
+#define IIO_TMP_STS_CH(x) \
+ ({ typeof(x) x_ = x; \
+ (x_ < 10) ? x_ : x_ + 6; })
+
+/* Message Channel*/
+/* Command 00h */
+#define REQUEST_IIO_CMD0_LEN 0x40
+#define REQUEST_IIO_CMD0_OFFSET 0x0000 /* OFFSET = SEL|CMD */
+#define IIO_VIN_EN(x) (0x00 + (x))
+#define IIO_TMP_EN(x) (0x02 + (x))
+/* Command 02h */
+#define REQUEST_IIO_CMD2_LEN 0x90
+#define REQUEST_IIO_CMD2_OFFSET 0x0002 /* OFFSET = SEL|CMD */
+#define IIO_SMI_CTRL_IDX 0x00
+#define IIO_VIN_LIMIT_IDX(x) (0x10 + ((x) * 2))
+#define IIO_TMP_LIMIT_IDX(x) (0x30 + ((x) * 2))
+#define IIO_CMD2_HYST_MASK 0x1F
+/* Command 03h */
+#define REQUEST_IIO_CMD3_LEN 0x08
+#define REQUEST_IIO_CMD3_OFFSET 0x0003 /* OFFSET = SEL|CMD */
+
+struct nct6694_iio_data {
+ struct nct6694 *nct6694;
+
+ /* Make sure read & write commands are consecutive */
+ struct mutex iio_lock;
+};
+
+static const struct iio_event_spec nct6694_volt_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),
+ }
+};
+
+static const struct iio_event_spec nct6694_temp_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ }
+};
+
+#define NCT6694_VOLTAGE_CHANNEL(num, addr) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = num, \
+ .address = addr, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE) | \
+ BIT(IIO_CHAN_INFO_PROCESSED), \
+ .event_spec = nct6694_volt_events, \
+ .num_event_specs = ARRAY_SIZE(nct6694_volt_events), \
+}
+
+#define NCT6694_TEMPERATURE_CHANNEL(num, addr) { \
+ .type = IIO_TEMP, \
+ .indexed = 1, \
+ .channel = num, \
+ .address = addr, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE) | \
+ BIT(IIO_CHAN_INFO_PROCESSED) | \
+ BIT(IIO_CHAN_INFO_HYSTERESIS), \
+ .event_spec = nct6694_temp_events, \
+ .num_event_specs = ARRAY_SIZE(nct6694_temp_events), \
+}
+
+static const struct iio_chan_spec nct6694_iio_channels[] = {
+ NCT6694_VOLTAGE_CHANNEL(0, 0x0), /* VIN0 */
+ NCT6694_VOLTAGE_CHANNEL(1, 0x1), /* VIN1 */
+ NCT6694_VOLTAGE_CHANNEL(2, 0x2), /* VIN2 */
+ NCT6694_VOLTAGE_CHANNEL(3, 0x3), /* VIN3 */
+ NCT6694_VOLTAGE_CHANNEL(4, 0x4), /* VIN5 */
+ NCT6694_VOLTAGE_CHANNEL(5, 0x5), /* VIN6 */
+ NCT6694_VOLTAGE_CHANNEL(6, 0x6), /* VIN7 */
+ NCT6694_VOLTAGE_CHANNEL(7, 0x7), /* VIN14 */
+ NCT6694_VOLTAGE_CHANNEL(8, 0x8), /* VIN15 */
+ NCT6694_VOLTAGE_CHANNEL(9, 0x9), /* VIN16 */
+ NCT6694_VOLTAGE_CHANNEL(10, 0xA), /* VBAT */
+ NCT6694_VOLTAGE_CHANNEL(11, 0xB), /* VSB */
+ NCT6694_VOLTAGE_CHANNEL(12, 0xC), /* AVSB */
+ NCT6694_VOLTAGE_CHANNEL(13, 0xD), /* VCC */
+ NCT6694_VOLTAGE_CHANNEL(14, 0xE), /* VHIF */
+ NCT6694_VOLTAGE_CHANNEL(15, 0xF), /* VTT */
+
+ NCT6694_TEMPERATURE_CHANNEL(0, 0x10), /* THR1 */
+ NCT6694_TEMPERATURE_CHANNEL(1, 0x12), /* THR2 */
+ NCT6694_TEMPERATURE_CHANNEL(2, 0x14), /* THR14 */
+ NCT6694_TEMPERATURE_CHANNEL(3, 0x16), /* THR15 */
+ NCT6694_TEMPERATURE_CHANNEL(4, 0x18), /* THR16 */
+ NCT6694_TEMPERATURE_CHANNEL(5, 0x1A), /* TDP0 */
+ NCT6694_TEMPERATURE_CHANNEL(6, 0x1C), /* TDP1 */
+ NCT6694_TEMPERATURE_CHANNEL(7, 0x1E), /* TDP2 */
+ NCT6694_TEMPERATURE_CHANNEL(8, 0x20), /* TDP3 */
+ NCT6694_TEMPERATURE_CHANNEL(9, 0x22), /* TDP4 */
+
+ NCT6694_TEMPERATURE_CHANNEL(10, 0x30), /* DTIN0 */
+ NCT6694_TEMPERATURE_CHANNEL(11, 0x32), /* DTIN1 */
+ NCT6694_TEMPERATURE_CHANNEL(12, 0x34), /* DTIN2 */
+ NCT6694_TEMPERATURE_CHANNEL(13, 0x36), /* DTIN3 */
+ NCT6694_TEMPERATURE_CHANNEL(14, 0x38), /* DTIN4 */
+ NCT6694_TEMPERATURE_CHANNEL(15, 0x3A), /* DTIN5 */
+ NCT6694_TEMPERATURE_CHANNEL(16, 0x3C), /* DTIN6 */
+ NCT6694_TEMPERATURE_CHANNEL(17, 0x3E), /* DTIN7 */
+ NCT6694_TEMPERATURE_CHANNEL(18, 0x40), /* DTIN8 */
+ NCT6694_TEMPERATURE_CHANNEL(19, 0x42), /* DTIN9 */
+ NCT6694_TEMPERATURE_CHANNEL(20, 0x44), /* DTIN10 */
+ NCT6694_TEMPERATURE_CHANNEL(21, 0x46), /* DTIN11 */
+ NCT6694_TEMPERATURE_CHANNEL(22, 0x48), /* DTIN12 */
+ NCT6694_TEMPERATURE_CHANNEL(23, 0x4A), /* DTIN13 */
+ NCT6694_TEMPERATURE_CHANNEL(24, 0x4C), /* DTIN14 */
+ NCT6694_TEMPERATURE_CHANNEL(25, 0x4E), /* DTIN15 */
+};
+
+static int nct6694_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct nct6694_iio_data *data = iio_priv(indio_dev);
+ unsigned char buf[2], tmp_hyst, enable_idx;
+ int ret;
+
+ if (chan->type != IIO_VOLTAGE && chan->type != IIO_TEMP)
+ return -EOPNOTSUPP;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_ENABLE:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ enable_idx = IIO_VIN_EN(chan->channel / 8);
+ break;
+
+ case IIO_TEMP:
+ enable_idx = IIO_TMP_EN(chan->channel / 8);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD0_OFFSET,
+ REQUEST_IIO_CMD0_LEN, enable_idx,
+ 1, buf);
+ if (ret)
+ return -EINVAL;
+
+ *val = buf[0] & BIT(chan->channel % 8) ? 1 : 0;
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_PROCESSED:
+ ret = nct6694_read_msg(data->nct6694, REQUEST_RPT_MOD,
+ chan->address, 2, 0, 2, buf);
+ if (ret)
+ return -EINVAL;
+
+ switch (chan->type) {
+ case IIO_VOLTAGE: /* in micro Voltage */
+ *val = buf[0] * 16;
+
+ return IIO_VAL_INT;
+
+ case IIO_TEMP: /* in milli degrees Celsius */
+ *val = (signed char)buf[0] * 1000;
+ *val += buf[1] & 0x80 ? 500 : 0;
+ *val += buf[1] & 0x40 ? 250 : 0;
+ *val += buf[1] & 0x20 ? 125 : 0;
+
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+
+ case IIO_CHAN_INFO_HYSTERESIS:
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN,
+ IIO_TMP_LIMIT_IDX(chan->channel),
+ 2, buf);
+ if (ret)
+ return -EINVAL;
+
+ switch (chan->type) {
+ case IIO_TEMP: /* in milli degrees Celsius */
+ tmp_hyst = buf[0] >> 5;
+ *val = (buf[1] - tmp_hyst) * 1000;
+
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int nct6694_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct nct6694_iio_data *data = iio_priv(indio_dev);
+ unsigned char enable_buf[REQUEST_IIO_CMD0_LEN] = {0};
+ unsigned char buf[REQUEST_IIO_CMD2_LEN] = {0};
+ unsigned char delta_hyst;
+ int ret;
+
+ if (chan->type != IIO_VOLTAGE && chan->type != IIO_TEMP)
+ return -EOPNOTSUPP;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_ENABLE:
+ mutex_lock(&data->iio_lock);
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD0_OFFSET,
+ REQUEST_IIO_CMD0_LEN, 0,
+ REQUEST_IIO_CMD0_LEN,
+ enable_buf);
+ if (ret)
+ goto err;
+
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ if (val) {
+ enable_buf[IIO_VIN_EN(chan->channel / 8)] |=
+ BIT(chan->channel % 8);
+ } else {
+ enable_buf[IIO_VIN_EN(chan->channel / 8)] &=
+ ~BIT(chan->channel % 8);
+ }
+
+ break;
+
+ case IIO_TEMP:
+ if (val) {
+ enable_buf[IIO_TMP_EN(chan->channel / 8)] |=
+ BIT(chan->channel % 8);
+ } else {
+ enable_buf[IIO_TMP_EN(chan->channel / 8)] &=
+ ~BIT(chan->channel % 8);
+ }
+
+ break;
+
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = nct6694_write_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD0_OFFSET,
+ REQUEST_IIO_CMD0_LEN, enable_buf);
+ if (ret)
+ goto err;
+
+ break;
+
+ case IIO_CHAN_INFO_HYSTERESIS:
+ switch (chan->type) {
+ case IIO_TEMP:
+ mutex_lock(&data->iio_lock);
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN, 0,
+ REQUEST_IIO_CMD2_LEN, buf);
+ if (ret)
+ goto err;
+
+ delta_hyst = buf[IIO_TMP_LIMIT_IDX(chan->channel) + 1] - (u8)val;
+ if (delta_hyst > 7) {
+ pr_err("%s: The Hysteresis value must be less than 7!\n",
+ __func__);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ buf[IIO_TMP_LIMIT_IDX(chan->channel)] &= IIO_CMD2_HYST_MASK;
+ buf[IIO_TMP_LIMIT_IDX(chan->channel)] |= (delta_hyst << 5);
+ break;
+
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+ ret = nct6694_write_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN, buf);
+ if (ret)
+ goto err;
+
+ break;
+
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+
+err:
+ mutex_unlock(&data->iio_lock);
+ return ret;
+}
+
+static int nct6694_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 nct6694_iio_data *data = iio_priv(indio_dev);
+ unsigned char buf, ch;
+ int ret;
+
+ if (chan->type != IIO_VOLTAGE && chan->type != IIO_TEMP)
+ return -EOPNOTSUPP;
+
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ ret = nct6694_read_msg(data->nct6694, REQUEST_RPT_MOD,
+ IIO_VIN_STS(chan->channel / 8),
+ 1, 0, 1, &buf);
+ if (ret)
+ return -EINVAL;
+
+ return !!(buf & BIT(chan->channel % 8));
+
+ case IIO_TEMP:
+ ch = (u8)IIO_TMP_STS_CH(chan->channel);
+
+ ret = nct6694_read_msg(data->nct6694, REQUEST_RPT_MOD,
+ IIO_TMP_STS(ch / 8),
+ 1, 0, 1, &buf);
+ if (ret)
+ return -EINVAL;
+
+ return !!(buf & BIT(ch % 8));
+
+ default:
+ return -EINVAL;
+ }
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int nct6694_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 nct6694_iio_data *data = iio_priv(indio_dev);
+ unsigned char buf[2];
+ int ret;
+
+ if (chan->type != IIO_VOLTAGE && chan->type != IIO_TEMP)
+ return -EOPNOTSUPP;
+
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN,
+ IIO_VIN_LIMIT_IDX(chan->channel),
+ 2, buf);
+ if (ret)
+ return -EINVAL;
+
+ *val = buf[0] * 16;
+ return IIO_VAL_INT;
+
+ case IIO_TEMP:
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN,
+ IIO_TMP_LIMIT_IDX(chan->channel),
+ 2, buf);
+ if (ret)
+ return -EINVAL;
+
+ *val = (signed char)buf[1] * 1000;
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+
+ case IIO_EV_DIR_FALLING:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN,
+ IIO_VIN_LIMIT_IDX(chan->channel),
+ 2, buf);
+ if (ret)
+ return -EINVAL;
+
+ *val = buf[1] * 16;
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int nct6694_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 nct6694_iio_data *data = iio_priv(indio_dev);
+ unsigned char buf[REQUEST_IIO_CMD2_LEN] = {0};
+ int ret;
+
+ if (chan->type != IIO_VOLTAGE && chan->type != IIO_TEMP)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&data->iio_lock);
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN, 0,
+ REQUEST_IIO_CMD2_LEN, buf);
+ if (ret)
+ goto err;
+
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ buf[IIO_VIN_LIMIT_IDX(chan->channel)] = (u8)val;
+ break;
+
+ case IIO_TEMP:
+ buf[IIO_TMP_LIMIT_IDX(chan->channel) + 1] = (s8)val;
+ break;
+
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+ break;
+
+ case IIO_EV_DIR_FALLING:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ buf[IIO_VIN_LIMIT_IDX(chan->channel) + 1] = (u8)val;
+ break;
+
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+ break;
+
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = nct6694_write_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN, buf);
+ if (ret)
+ goto err;
+
+err:
+ mutex_unlock(&data->iio_lock);
+ return ret;
+}
+
+static const struct iio_info nct6694_iio_info = {
+ .read_raw = nct6694_read_raw,
+ .write_raw = nct6694_write_raw,
+ .read_event_config = nct6694_read_event_config,
+ .read_event_value = nct6694_read_event_value,
+ .write_event_value = nct6694_write_event_value,
+};
+
+static int nct6694_iio_init(struct nct6694_iio_data *data)
+{
+ unsigned char buf[REQUEST_IIO_CMD2_LEN] = {0};
+ int ret;
+
+ /* Set VIN & TMP Real Time alarm mode */
+ mutex_lock(&data->iio_lock);
+ ret = nct6694_read_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN, 0,
+ REQUEST_IIO_CMD2_LEN, buf);
+ if (ret)
+ goto err;
+
+ buf[IIO_SMI_CTRL_IDX] = 0x02;
+ ret = nct6694_write_msg(data->nct6694, REQUEST_IIO_MOD,
+ REQUEST_IIO_CMD2_OFFSET,
+ REQUEST_IIO_CMD2_LEN, buf);
+ if (ret)
+ goto err;
+
+err:
+ mutex_unlock(&data->iio_lock);
+ return ret;
+}
+
+static int nct6694_iio_probe(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev;
+ struct nct6694_iio_data *data;
+ struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent);
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ data->nct6694 = nct6694;
+ mutex_init(&data->iio_lock);
+ platform_set_drvdata(pdev, data);
+
+ ret = nct6694_iio_init(data);
+ if (ret)
+ return -EIO;
+
+ indio_dev->name = pdev->name;
+ indio_dev->channels = nct6694_iio_channels;
+ indio_dev->num_channels = ARRAY_SIZE(nct6694_iio_channels);
+ indio_dev->info = &nct6694_iio_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ /* Register iio device to IIO framework */
+ ret = devm_iio_device_register(&pdev->dev, indio_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register iio device!\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct platform_driver nct6694_iio_driver = {
+ .driver = {
+ .name = DRVNAME,
+ },
+ .probe = nct6694_iio_probe,
+};
+
+static int __init nct6694_init(void)
+{
+ int err;
+
+ err = platform_driver_register(&nct6694_iio_driver);
+ if (!err) {
+ if (err)
+ platform_driver_unregister(&nct6694_iio_driver);
+ }
+
+ return err;
+}
+subsys_initcall(nct6694_init);
+
+static void __exit nct6694_exit(void)
+{
+ platform_driver_unregister(&nct6694_iio_driver);
+}
+module_exit(nct6694_exit);
+
+MODULE_DESCRIPTION("USB-IIO driver for NCT6694");
+MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>");
+MODULE_LICENSE("GPL");
--
2.34.1