Add iio driver for Maxim max9611/9612 current-sense amplifiers with
12-bits ADC.
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
drivers/iio/adc/Kconfig | 10 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/max961x.c | 648 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 659 insertions(+)
create mode 100644 drivers/iio/adc/max961x.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index dedae7a..f86026a 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -354,6 +354,16 @@ config MAX1363
To compile this driver as a module, choose M here: the module will be
called max1363.
+config MAX961x
+ tristate "Maxim max9611/9612 ADC driver"
+ depends on I2C
+ help
+ Say yes here to build support for Maxim max9611/9612 current sense
+ amplifiers with 12-bits ADC interface.
+
+ To compile this driver as a module, choose M here: the module will be
+ called max961x.
+
config MCP320X
tristate "Microchip Technology MCP3x01/02/04/08"
depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index d001262..ff19250 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_LTC2485) += ltc2485.o
obj-$(CONFIG_MAX1027) += max1027.o
obj-$(CONFIG_MAX11100) += max11100.o
obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_MAX961x) += max961x.o
obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_MCP3422) += mcp3422.o
obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o
diff --git a/drivers/iio/adc/max961x.c b/drivers/iio/adc/max961x.c
new file mode 100644
index 0000000..a544e69
--- /dev/null
+++ b/drivers/iio/adc/max961x.c
@@ -0,0 +1,648 @@
+/*
+ * iio/adc/max961x.c
+ *
+ * Maxim max9611/9612 high side current sense amplifier with
+ * 12-bit ADC interface.
+ *
+ * Copyright (C) 2017 Jacopo Mondi
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This driver supports input common-mode voltage, current-sense
+ * amplifier with programmable gains and die temperature reading from
+ * Maxim max9611/9612.
+ * Op-amp, analog comparator, and watchdog functionalities are not
+ * supported by this driver.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/module.h>
+
+#define DRIVER_NAME "max961x"
+
+/* max961x register addresses */
+#define REG_CSA_DATA 0x00
+#define REG_RS_DATA 0x02
+#define REG_TEMP_DATA 0x08
+#define REG_CTRL1 0x0a
+#define REG_CTRL2 0x0b
+
+/* max961x REG1 mux configuration options */
+#define MUX_MASK 0x07
+#define MUX_SENSE_1x 0x00
+#define MUX_SENSE_4x 0x01
+#define MUX_SENSE_8x 0x02
+#define MUX_INPUT_VOLTAGE 0x03
+#define MUX_TEMPERATURE 0x06
+
+/* max961x voltage (both sense and input) helper macros */
+#define MAX961x_VOLTAGE_SHIFT 0x04
+#define MAX961x_VOLTAGE_RAW(_r) ((_r) >> MAX961x_VOLTAGE_SHIFT)
+
+/*
+ * max961x current sense amplifier voltage output:
+ * LSB and offset values depends on selected gain (1x, 4x, 8x)
+ *
+ * GAIN LSB (nV) OFFSET (LSB steps)
+ * 1x 107500 1
+ * 4x 26880 1
+ * 8x 13440 3
+ *
+ * The complete formula to calculate current sense voltage is:
+ * (((adc_read >> 4) - offset) / ((1 / LSB) * 10^-3)
+ */
+#define CSA_VOLT_1x_LSB_nV 107500
+#define CSA_VOLT_4x_LSB_nV 26880
+#define CSA_VOLT_8x_LSB_nV 13440
+#define CSA_VOLT_1x_LSB_DIV 9302
+#define CSA_VOLT_4x_LSB_DIV 37202
+#define CSA_VOLT_8x_LSB_DIV 74404
+
+#define CSA_VOLT_1x_OFFS_RAW 1
+#define CSA_VOLT_4x_OFFS_RAW 1
+#define CSA_VOLT_8x_OFFS_RAW 3
+#define CSA_VOLT_1x_OFFS_uV 100
+#define CSA_VOLT_4x_OFFS_uV 45
+#define CSA_VOLT_8x_OFFS_uV 45
+
+#define CSA_VOLT_IIO_RAW(_r, _offs) \
+ ((MAX961x_VOLTAGE_RAW(_r) - (_offs)) * 1000)
+
+/*
+ * max961x common input mode (CIM): LSB is 14mV, with 14mV offset at 25 C
+ *
+ * The complete formula to calculate input common voltage is:
+ * (((adc_read >> 4) * 1000) - offset) / (1 / 14 * 1000)
+ */
+#define CIM_VOLTAGE_LSB_mV 14
+#define CIM_VOLTAGE_OFFSET_mV 14
+#define CIM_VOLTAGE_OFFSET_RAW 1
+
+/*
+ * max961x temperature reading: LSB is 0.48 degrees Celsius
+ *
+ * The complete formula to calculate temperature is:
+ * ((adc_read >> 7) * 1000) / (1 / 0.48 * 1000)
+ */
+#define TEMP_SHIFT 0x07
+#define TEMP_MAX_RAW_POS 0x7f80
+#define TEMP_MAX_RAW_NEG 0xff80
+#define TEMP_MIN_RAW_NEG 0xd980
+#define TEMP_MASK ((1 << TEMP_SHIFT) - 1)
+#define TEMP_RAW(_r) ((_r) >> TEMP_SHIFT)
+#define TEMP_LSB_mC 480
+#define TEMP_SCALE_NUM 1000
+#define TEMP_SCALE_DIV 2083
+
+struct max961x_dev {
+ struct device *dev;
+ struct i2c_client *i2c_client;
+ unsigned int shunt_resistor_uOhm;
+};
+
+enum max961x_conf_ids {
+ CONF_SENSE_1x,
+ CONF_SENSE_4x,
+ CONF_SENSE_8x,
+ CONF_IN_VOLT,
+ CONF_TEMP,
+};
+
+/**
+ * max961x_conf - associate ADC mux configuration with register address where
+ * data shall be read from
+ */
+static unsigned int max961x_conf[][2] = {
+ /* CONF_SENSE_1x */
+ { MUX_SENSE_1x, REG_CSA_DATA },
+ /* CONF_SENSE_4x */
+ { MUX_SENSE_4x, REG_CSA_DATA },
+ /* CONF_SENSE_8x */
+ { MUX_SENSE_8x, REG_CSA_DATA },
+ /* CONF_IN_VOLT */
+ { MUX_INPUT_VOLTAGE, REG_RS_DATA },
+ /* CONF_TEMP */
+ { MUX_TEMPERATURE, REG_TEMP_DATA },
+};
+
+enum max961x_csa_gain {
+ CSA_GAIN_1x,
+ CSA_GAIN_4x,
+ CSA_GAIN_8x,
+};
+
+enum max961x_csa_gain_params {
+ CSA_GAIN_LSB_nV,
+ CSA_GAIN_LSB_DIV,
+ CSA_GAIN_OFFS_nV,
+ CSA_GAIN_OFFS_RAW,
+};
+
+/**
+ * max961x_csa_gain_conf - associate gain multiplier with LSB and
+ * offset values.
+ *
+ * Group together parameters associated with configurable gain
+ * on current sense amplifier path to ADC interface.
+ * Current sense read routine adjusts gain until it gets a meaningful
+ * value; use this structure to retrieve the correct LSB and offset values.
+ */
+static unsigned int max961x_gain_conf[][4] = {
+ { /* [0] CSA_GAIN_1x */
+ CSA_VOLT_1x_LSB_nV,
+ CSA_VOLT_1x_LSB_DIV,
+ CSA_VOLT_1x_OFFS_uV,
+ CSA_VOLT_1x_OFFS_RAW,
+ },
+ { /* [1] CSA_GAIN_4x */
+ CSA_VOLT_4x_LSB_nV,
+ CSA_VOLT_4x_LSB_DIV,
+ CSA_VOLT_4x_OFFS_uV,
+ CSA_VOLT_4x_OFFS_RAW,
+ },
+ { /* [2] CSA_GAIN_8x */
+ CSA_VOLT_8x_LSB_nV,
+ CSA_VOLT_8x_LSB_DIV,
+ CSA_VOLT_8x_OFFS_uV,
+ CSA_VOLT_8x_OFFS_RAW,
+ },
+};
+
+/**
+ * max961x_chan_ids - Identify IIO channels
+ */
+enum max961x_chan_ids {
+ MAX961x_CHAN_VOLTAGE_INPUT,
+ MAX961x_CHAN_VOLTAGE_SENSE,
+ MAX961x_CHAN_TEMPERATURE,
+ MAX961x_CHAN_CURRENT_LOAD,
+ MAX961x_CHAN_POWER_LOAD,
+};
+
+static struct iio_chan_spec max961x_channels[] = {
+ { /* [0] die temperature */
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = MAX961x_CHAN_TEMPERATURE,
+ },
+ { /* [1] common voltage input */
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ .address = MAX961x_CHAN_VOLTAGE_INPUT,
+ .channel = MAX961x_CHAN_VOLTAGE_INPUT,
+ .indexed = 1,
+ },
+ { /* [2] current sense amplifier voltage output */
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ .address = MAX961x_CHAN_VOLTAGE_SENSE,
+ .channel = MAX961x_CHAN_VOLTAGE_SENSE,
+ .indexed = 1,
+ },
+ { /* [3] load current measurement */
+ .type = IIO_CURRENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = MAX961x_CHAN_CURRENT_LOAD,
+ },
+ { /* [4] load current measurement */
+ .type = IIO_POWER,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = MAX961x_CHAN_POWER_LOAD,
+ },
+};
+
+static int max961x_reg_read(struct max961x_dev *max961x, u8 reg, u16 *val)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_swapped(max961x->i2c_client, reg);
+ if (ret < 0) {
+ dev_err(max961x->dev, "i2c read word from 0x%2x failed\n",
+ reg);
+ return ret;
+ }
+
+ *val = ret;
+
+ return 0;
+}
+
+static int max961x_reg_write(struct max961x_dev *max961x, u8 reg, u8 val)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(max961x->i2c_client, reg, val);
+ if (ret) {
+ dev_err(max961x->dev, "i2c write byte failed: 0x%2x - 0x%2x\n",
+ reg, val);
+ return ret;
+ }
+
+ /* FIXME: need a delay here to make register configuration
+ * stabilize. 1 msec at least, from empirical testing.
+ */
+ usleep_range(1000, 2000);
+
+ return 0;
+}
+
+/**
+ * max961x_read_single() - read a single vale from ADC interface
+ *
+ * Data registers are 16 bit long, spread between two 8 bit registers
+ * with consecutive addresses.
+ * Configure ADC mux first, then read register at address "reg_addr".
+ * The smbus_read_word routine asks for 16 bits and the ADC is kind enough
+ * to return values from "reg_addr" and "reg_addr + 1" consecutively.
+ *
+ * @max961x: max961x device
+ * @selector: index for mux and register configuration
+ * @raw_val: the value returned from ADC
+ */
+static int max961x_read_single(struct max961x_dev *max961x,
+ enum max961x_conf_ids selector,
+ u16 *raw_val)
+{
+ int ret;
+
+ u8 mux_conf = max961x_conf[selector][0] & MUX_MASK;
+ u8 reg_addr = max961x_conf[selector][1];
+
+ ret = max961x_reg_write(max961x, REG_CTRL1, mux_conf);
+ if (ret)
+ return ret;
+
+ ret = max961x_reg_read(max961x, reg_addr, raw_val);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * max961x_read_csa_voltage() - read current sense amplifier output voltage
+ *
+ * Current sense amplifier output voltage is read through a configurable
+ * 1x, 4x or 8x gain.
+ * Start with plain 1x gain, and adjust gain control properly until a
+ * meaningful value is read from ADC output.
+ *
+ * @max961x: max961x device
+ * @adc_raw: raw value read from ADC output
+ * @csa_gain: gain configuration option selector
+ */
+static int max961x_read_csa_voltage(struct max961x_dev *max961x,
+ u16 *adc_raw,
+ enum max961x_csa_gain *csa_gain)
+{
+ int ret;
+ unsigned int i;
+ enum max961x_conf_ids gain_selectors[] = {
+ CONF_SENSE_1x,
+ CONF_SENSE_4x,
+ CONF_SENSE_8x
+ };
+
+ for (i = 0; i < ARRAY_SIZE(gain_selectors); ++i) {
+ ret = max961x_read_single(max961x, gain_selectors[i], adc_raw);
+ if (ret)
+ return ret;
+
+ if (*adc_raw > 0) {
+ *csa_gain = gain_selectors[i];
+ return 0;
+ }
+ }
+
+ return -EIO;
+}
+
+static int max961x_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ int ret;
+ u16 adc_data;
+ enum max961x_csa_gain gain_selector;
+ unsigned int *csa_gain;
+ struct max961x_dev *dev = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->address) {
+ case MAX961x_CHAN_TEMPERATURE:
+ ret = max961x_read_single(dev, CONF_TEMP,
+ &adc_data);
+ if (ret)
+ return ret;
+
+ *val = TEMP_RAW(adc_data);
+
+ return IIO_VAL_INT;
+
+ case MAX961x_CHAN_VOLTAGE_INPUT:
+ ret = max961x_read_single(dev, CONF_IN_VOLT,
+ &adc_data);
+ if (ret)
+ return ret;
+
+ *val = MAX961x_VOLTAGE_RAW(adc_data);
+
+ return IIO_VAL_INT;
+
+ case MAX961x_CHAN_VOLTAGE_SENSE:
+ ret = max961x_read_csa_voltage(dev, &adc_data,
+ &gain_selector);
+ if (ret)
+ return ret;
+
+ *val = MAX961x_VOLTAGE_RAW(adc_data);
+
+ return IIO_VAL_INT;
+
+ case MAX961x_CHAN_CURRENT_LOAD:
+ /* raw (nV): raw * LSB (nV) */
+ ret = max961x_read_csa_voltage(dev, &adc_data,
+ &gain_selector);
+ if (ret)
+ return ret;
+
+ csa_gain = max961x_gain_conf[gain_selector];
+
+ *val = MAX961x_VOLTAGE_RAW(adc_data) *
+ csa_gain[CSA_GAIN_LSB_nV];
+
+ return IIO_VAL_INT;
+
+ case MAX961x_CHAN_POWER_LOAD:
+ /* raw (mV): raw * LSB (mV) */
+ ret = max961x_read_single(dev, CONF_IN_VOLT,
+ &adc_data);
+
+ *val = MAX961x_VOLTAGE_RAW(adc_data) *
+ CIM_VOLTAGE_LSB_mV;
+
+ return IIO_VAL_INT;
+ }
+
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->address) {
+
+ case MAX961x_CHAN_TEMPERATURE:
+ /* processed (C): raw * scale (C) */
+ *val = TEMP_SCALE_NUM;
+ *val2 = TEMP_SCALE_DIV;
+
+ return IIO_VAL_FRACTIONAL;
+
+ case MAX961x_CHAN_VOLTAGE_INPUT:
+ /* processed (mV): raw * scale_mV */
+ ret = max961x_read_single(dev, CONF_IN_VOLT,
+ &adc_data);
+ if (ret)
+ return ret;
+
+ *val = CIM_VOLTAGE_LSB_mV;
+
+ return IIO_VAL_INT;
+
+ case MAX961x_CHAN_VOLTAGE_SENSE:
+ /* processed (mV): raw (mV) * (scale (nV) / 10^6) */
+ ret = max961x_read_csa_voltage(dev, &adc_data,
+ &gain_selector);
+ if (ret)
+ return ret;
+
+ csa_gain = max961x_gain_conf[gain_selector];
+
+ *val = csa_gain[CSA_GAIN_LSB_nV];
+ *val2 = 1000000;
+
+ return IIO_VAL_FRACTIONAL;
+
+ case MAX961x_CHAN_CURRENT_LOAD:
+ /* processed (mA): raw (nV) / scale (uOhm) */
+ *val = 1;
+ *val2 = dev->shunt_resistor_uOhm;
+
+ return IIO_VAL_FRACTIONAL;
+
+ case MAX961x_CHAN_POWER_LOAD:
+ /* processed (mW): raw (mV) * (scale (mA) / 1000) */
+ ret = max961x_read_csa_voltage(dev, &adc_data,
+ &gain_selector);
+ if (ret)
+ return ret;
+
+ csa_gain = max961x_gain_conf[gain_selector];
+
+ /* val = (nV / uOhm) = mA */
+ *val = MAX961x_VOLTAGE_RAW(adc_data) *
+ csa_gain[CSA_GAIN_LSB_nV];
+ *val /= dev->shunt_resistor_uOhm;
+
+ *val2 = 1000;
+
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ case IIO_CHAN_INFO_OFFSET:
+ switch (chan->address) {
+ case MAX961x_CHAN_VOLTAGE_INPUT:
+ *val = CIM_VOLTAGE_OFFSET_RAW;
+
+ return IIO_VAL_INT;
+
+ case MAX961x_CHAN_VOLTAGE_SENSE:
+ ret = max961x_read_csa_voltage(dev, &adc_data,
+ &gain_selector);
+ if (ret)
+ return ret;
+
+ *val = max961x_gain_conf[gain_selector]
+ [CSA_GAIN_OFFS_RAW];
+ *val2 = 1000;
+
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ case IIO_CHAN_INFO_PROCESSED:
+ /* processed (mC): raw * LSB (mC) */
+ if (chan->address != MAX961x_CHAN_TEMPERATURE)
+ return -EINVAL;
+
+ ret = max961x_read_single(dev, CONF_TEMP,
+ &adc_data);
+ if (ret)
+ return ret;
+
+ *val = TEMP_RAW(adc_data) * TEMP_LSB_mC;
+
+ return IIO_VAL_INT;
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t max961x_shunt_resistor_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct max961x_dev *max961x = iio_priv(dev_to_iio_dev(dev));
+
+ return sprintf(buf, "%d\n", max961x->shunt_resistor_uOhm);
+}
+
+static IIO_DEVICE_ATTR(in_shunt_resistor, S_IRUGO,
+ max961x_shunt_resistor_show, NULL, 0);
+
+static struct attribute *max961x_attributes[] = {
+ &iio_dev_attr_in_shunt_resistor.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group max961x_attribute_group = {
+ .attrs = max961x_attributes,
+};
+
+static const struct iio_info indio_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = max961x_read_raw,
+ .attrs = &max961x_attribute_group,
+};
+
+static int max961x_init(struct max961x_dev *max961x)
+{
+ int ret;
+ u16 regval;
+ struct i2c_client *client = max961x->i2c_client;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WRITE_BYTE |
+ I2C_FUNC_SMBUS_READ_WORD_DATA)) {
+ dev_err(max961x->dev,
+ "I2c adapter does not support smbus write_byte and "\
+ "read_word_data functionalities. Aborting probe.\n");
+ return -EINVAL;
+ }
+
+ max961x_reg_write(max961x, REG_CTRL1, MUX_TEMPERATURE);
+ max961x_reg_write(max961x, REG_CTRL2, 0);
+
+ /* Make sure die temperature is in range to test communications. */
+ regval = 0;
+ ret = max961x_reg_read(max961x, REG_TEMP_DATA, ®val);
+ if (ret)
+ return ret;
+
+ regval = regval & ~TEMP_MASK;
+ if ((regval > TEMP_MAX_RAW_POS &&
+ regval < TEMP_MIN_RAW_NEG) ||
+ regval > TEMP_MAX_RAW_NEG) {
+ dev_err(max961x->dev,
+ "In-valid value received from ADC 0x%4x: aborting\n",
+ regval);
+ return -EIO;
+ }
+
+ /* Mux shall be zeroed back before applying other configurations */
+ max961x_reg_write(max961x, REG_CTRL1, 0);
+
+ return 0;
+}
+
+static int max961x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct max961x_dev *max961x;
+ struct iio_dev *indio_dev;
+ struct device_node *of_node = client->dev.of_node;
+ unsigned int of_shunt;
+ const char * const shunt_res_prop = "shunt-resistor";
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*max961x));
+ if (IS_ERR(indio_dev))
+ return PTR_ERR(indio_dev);
+
+ i2c_set_clientdata(client, indio_dev);
+
+ max961x = iio_priv(indio_dev);
+ max961x->dev = &client->dev;
+ max961x->i2c_client = client;
+
+ ret = of_property_read_u32(of_node, shunt_res_prop, &of_shunt);
+ if (ret) {
+ dev_err(&client->dev,
+ "Missing %s property for %s node\n",
+ shunt_res_prop, of_node->full_name);
+ return ret;
+ }
+ max961x->shunt_resistor_uOhm = of_shunt;
+
+ ret = max961x_init(max961x);
+ if (ret)
+ return ret;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->dev.of_node = client->dev.of_node;
+ indio_dev->name = DRIVER_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &indio_info;
+ indio_dev->channels = max961x_channels;
+ indio_dev->num_channels = ARRAY_SIZE(max961x_channels);
+
+ ret = devm_iio_device_register(&client->dev, indio_dev);
+ if (ret)
+ return ret;
+
+ dev_info(&client->dev, "%s: probed\n", DRIVER_NAME);
+
+ return 0;
+}
+
+static int max961x_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+
+ return 0;
+}
+
+static const struct of_device_id max961x_of_table[] = {
+ {.compatible = "maxim,max961x"},
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, max961x_of_table);
+
+static struct i2c_driver max961x_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = max961x_of_table,
+ },
+ .probe = max961x_probe,
+ .remove = max961x_remove,
+};
+module_i2c_driver(max961x_driver);
+
+MODULE_AUTHOR("Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Maxim max9611/12 current sense amplifier with 12bit ADC");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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