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iio: adc: Add Maxim max9611 ADC driver
Add iio driver for Maxim max9611 and max9612 current-sense amplifiers with 12-bits ADC interface. Datasheet publicly available at: https://datasheets.maximintegrated.com/en/ds/MAX9611-MAX9612.pdf Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Jacopo Mondi
Jonathan Cameron
parent
3fed601c1c
commit
69780a3bbc
@ -398,6 +398,16 @@ config MAX1363
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To compile this driver as a module, choose M here: the module will be
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called max1363.
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config MAX9611
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tristate "Maxim max9611/max9612 ADC driver"
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depends on I2C
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help
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Say yes here to build support for Maxim max9611/max9612 current sense
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amplifier with 12-bits ADC interface.
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To compile this driver as a module, choose M here: the module will be
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called max9611.
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config MCP320X
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tristate "Microchip Technology MCP3x01/02/04/08"
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depends on SPI
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@ -38,6 +38,7 @@ obj-$(CONFIG_LTC2497) += ltc2497.o
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obj-$(CONFIG_MAX1027) += max1027.o
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obj-$(CONFIG_MAX11100) += max11100.o
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obj-$(CONFIG_MAX1363) += max1363.o
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obj-$(CONFIG_MAX9611) += max9611.o
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obj-$(CONFIG_MCP320X) += mcp320x.o
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obj-$(CONFIG_MCP3422) += mcp3422.o
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obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o
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585
drivers/iio/adc/max9611.c
Normal file
585
drivers/iio/adc/max9611.c
Normal file
@ -0,0 +1,585 @@
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/*
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* iio/adc/max9611.c
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*
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* Maxim max9611/max9612 high side current sense amplifier with
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* 12-bit ADC interface.
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*
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* Copyright (C) 2017 Jacopo Mondi
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* This driver supports input common-mode voltage, current-sense
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* amplifier with programmable gains and die temperature reading from
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* Maxim max9611/max9612.
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*
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* Op-amp, analog comparator, and watchdog functionalities are not
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* supported by this driver.
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#define DRIVER_NAME "max9611"
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/* max9611 register addresses */
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#define MAX9611_REG_CSA_DATA 0x00
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#define MAX9611_REG_RS_DATA 0x02
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#define MAX9611_REG_TEMP_DATA 0x08
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#define MAX9611_REG_CTRL1 0x0a
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#define MAX9611_REG_CTRL2 0x0b
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/* max9611 REG1 mux configuration options */
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#define MAX9611_MUX_MASK GENMASK(3, 0)
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#define MAX9611_MUX_SENSE_1x 0x00
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#define MAX9611_MUX_SENSE_4x 0x01
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#define MAX9611_MUX_SENSE_8x 0x02
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#define MAX9611_INPUT_VOLT 0x03
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#define MAX9611_MUX_TEMP 0x06
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/* max9611 voltage (both csa and input) helper macros */
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#define MAX9611_VOLTAGE_SHIFT 0x04
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#define MAX9611_VOLTAGE_RAW(_r) ((_r) >> MAX9611_VOLTAGE_SHIFT)
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/*
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* max9611 current sense amplifier voltage output:
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* LSB and offset values depends on selected gain (1x, 4x, 8x)
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*
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* GAIN LSB (nV) OFFSET (LSB steps)
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* 1x 107500 1
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* 4x 26880 1
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* 8x 13440 3
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*
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* The complete formula to calculate current sense voltage is:
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* (((adc_read >> 4) - offset) / ((1 / LSB) * 10^-3)
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*/
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#define MAX9611_CSA_1X_LSB_nV 107500
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#define MAX9611_CSA_4X_LSB_nV 26880
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#define MAX9611_CSA_8X_LSB_nV 13440
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#define MAX9611_CSA_1X_OFFS_RAW 1
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#define MAX9611_CSA_4X_OFFS_RAW 1
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#define MAX9611_CSA_8X_OFFS_RAW 3
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/*
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* max9611 common input mode (CIM): LSB is 14mV, with 14mV offset at 25 C
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*
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* The complete formula to calculate input common voltage is:
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* (((adc_read >> 4) * 1000) - offset) / (1 / 14 * 1000)
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*/
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#define MAX9611_CIM_LSB_mV 14
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#define MAX9611_CIM_OFFSET_RAW 1
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/*
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* max9611 temperature reading: LSB is 480 milli degrees Celsius
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*
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* The complete formula to calculate temperature is:
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* ((adc_read >> 7) * 1000) / (1 / 480 * 1000)
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*/
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#define MAX9611_TEMP_MAX_POS 0x7f80
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#define MAX9611_TEMP_MAX_NEG 0xff80
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#define MAX9611_TEMP_MIN_NEG 0xd980
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#define MAX9611_TEMP_MASK GENMASK(7, 15)
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#define MAX9611_TEMP_SHIFT 0x07
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#define MAX9611_TEMP_RAW(_r) ((_r) >> MAX9611_TEMP_SHIFT)
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#define MAX9611_TEMP_SCALE_NUM 1000000
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#define MAX9611_TEMP_SCALE_DIV 2083
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struct max9611_dev {
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struct device *dev;
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struct i2c_client *i2c_client;
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struct mutex lock;
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unsigned int shunt_resistor_uohm;
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};
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enum max9611_conf_ids {
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CONF_SENSE_1x,
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CONF_SENSE_4x,
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CONF_SENSE_8x,
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CONF_IN_VOLT,
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CONF_TEMP,
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};
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/**
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* max9611_mux_conf - associate ADC mux configuration with register address
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* where data shall be read from
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*/
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static const unsigned int max9611_mux_conf[][2] = {
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/* CONF_SENSE_1x */
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{ MAX9611_MUX_SENSE_1x, MAX9611_REG_CSA_DATA },
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/* CONF_SENSE_4x */
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{ MAX9611_MUX_SENSE_4x, MAX9611_REG_CSA_DATA },
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/* CONF_SENSE_8x */
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{ MAX9611_MUX_SENSE_8x, MAX9611_REG_CSA_DATA },
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/* CONF_IN_VOLT */
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{ MAX9611_INPUT_VOLT, MAX9611_REG_RS_DATA },
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/* CONF_TEMP */
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{ MAX9611_MUX_TEMP, MAX9611_REG_TEMP_DATA },
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};
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enum max9611_csa_gain {
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CSA_GAIN_1x,
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CSA_GAIN_4x,
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CSA_GAIN_8x,
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};
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enum max9611_csa_gain_params {
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CSA_GAIN_LSB_nV,
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CSA_GAIN_OFFS_RAW,
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};
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/**
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* max9611_csa_gain_conf - associate gain multiplier with LSB and
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* offset values.
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*
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* Group together parameters associated with configurable gain
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* on current sense amplifier path to ADC interface.
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* Current sense read routine adjusts gain until it gets a meaningful
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* value; use this structure to retrieve the correct LSB and offset values.
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*/
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static const unsigned int max9611_gain_conf[][2] = {
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{ /* [0] CSA_GAIN_1x */
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MAX9611_CSA_1X_LSB_nV,
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MAX9611_CSA_1X_OFFS_RAW,
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},
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{ /* [1] CSA_GAIN_4x */
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MAX9611_CSA_4X_LSB_nV,
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MAX9611_CSA_4X_OFFS_RAW,
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},
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{ /* [2] CSA_GAIN_8x */
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MAX9611_CSA_8X_LSB_nV,
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MAX9611_CSA_8X_OFFS_RAW,
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},
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};
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enum max9611_chan_addrs {
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MAX9611_CHAN_VOLTAGE_INPUT,
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MAX9611_CHAN_VOLTAGE_SENSE,
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MAX9611_CHAN_TEMPERATURE,
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MAX9611_CHAN_CURRENT_LOAD,
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MAX9611_CHAN_POWER_LOAD,
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};
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static const struct iio_chan_spec max9611_channels[] = {
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.address = MAX9611_CHAN_TEMPERATURE,
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},
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{
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.type = IIO_VOLTAGE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.address = MAX9611_CHAN_VOLTAGE_SENSE,
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.indexed = 1,
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.channel = 0,
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},
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{
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.type = IIO_VOLTAGE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.address = MAX9611_CHAN_VOLTAGE_INPUT,
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.indexed = 1,
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.channel = 1,
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},
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{
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.type = IIO_CURRENT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.address = MAX9611_CHAN_CURRENT_LOAD,
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},
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{
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.type = IIO_POWER,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.address = MAX9611_CHAN_POWER_LOAD
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},
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};
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/**
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* max9611_read_single() - read a single value from ADC interface
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*
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* Data registers are 16 bit long, spread between two 8 bit registers
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* with consecutive addresses.
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* Configure ADC mux first, then read register at address "reg_addr".
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* The smbus_read_word routine asks for 16 bits and the ADC is kind enough
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* to return values from "reg_addr" and "reg_addr + 1" consecutively.
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* Data are transmitted with big-endian ordering: MSB arrives first.
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*
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* @max9611: max9611 device
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* @selector: index for mux and register configuration
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* @raw_val: the value returned from ADC
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*/
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static int max9611_read_single(struct max9611_dev *max9611,
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enum max9611_conf_ids selector,
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u16 *raw_val)
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{
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int ret;
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u8 mux_conf = max9611_mux_conf[selector][0] & MAX9611_MUX_MASK;
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u8 reg_addr = max9611_mux_conf[selector][1];
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/*
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* Keep mutex lock held during read-write to avoid mux register
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* (CTRL1) re-configuration.
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*/
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mutex_lock(&max9611->lock);
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ret = i2c_smbus_write_byte_data(max9611->i2c_client,
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MAX9611_REG_CTRL1, mux_conf);
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if (ret) {
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dev_err(max9611->dev, "i2c write byte failed: 0x%2x - 0x%2x\n",
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MAX9611_REG_CTRL1, mux_conf);
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mutex_unlock(&max9611->lock);
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return ret;
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}
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/*
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* need a delay here to make register configuration
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* stabilize. 1 msec at least, from empirical testing.
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*/
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usleep_range(1000, 2000);
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ret = i2c_smbus_read_word_swapped(max9611->i2c_client, reg_addr);
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if (ret < 0) {
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dev_err(max9611->dev, "i2c read word from 0x%2x failed\n",
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reg_addr);
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mutex_unlock(&max9611->lock);
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return ret;
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}
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*raw_val = ret;
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mutex_unlock(&max9611->lock);
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return 0;
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}
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/**
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* max9611_read_csa_voltage() - read current sense amplifier output voltage
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*
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* Current sense amplifier output voltage is read through a configurable
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* 1x, 4x or 8x gain.
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* Start with plain 1x gain, and adjust gain control properly until a
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* meaningful value is read from ADC output.
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*
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* @max9611: max9611 device
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* @adc_raw: raw value read from ADC output
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* @csa_gain: gain configuration option selector
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*/
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static int max9611_read_csa_voltage(struct max9611_dev *max9611,
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u16 *adc_raw,
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enum max9611_csa_gain *csa_gain)
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{
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enum max9611_conf_ids gain_selectors[] = {
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CONF_SENSE_1x,
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CONF_SENSE_4x,
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CONF_SENSE_8x
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};
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unsigned int i;
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int ret;
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for (i = 0; i < ARRAY_SIZE(gain_selectors); ++i) {
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ret = max9611_read_single(max9611, gain_selectors[i], adc_raw);
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if (ret)
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return ret;
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if (*adc_raw > 0) {
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*csa_gain = gain_selectors[i];
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return 0;
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}
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}
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return -EIO;
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}
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static int max9611_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct max9611_dev *dev = iio_priv(indio_dev);
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enum max9611_csa_gain gain_selector;
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const unsigned int *csa_gain;
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u16 adc_data;
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (chan->address) {
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case MAX9611_CHAN_TEMPERATURE:
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ret = max9611_read_single(dev, CONF_TEMP,
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&adc_data);
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if (ret)
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return -EINVAL;
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*val = MAX9611_TEMP_RAW(adc_data);
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return IIO_VAL_INT;
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case MAX9611_CHAN_VOLTAGE_INPUT:
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ret = max9611_read_single(dev, CONF_IN_VOLT,
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&adc_data);
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if (ret)
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return -EINVAL;
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*val = MAX9611_VOLTAGE_RAW(adc_data);
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return IIO_VAL_INT;
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}
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break;
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case IIO_CHAN_INFO_OFFSET:
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/* MAX9611_CHAN_VOLTAGE_INPUT */
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*val = MAX9611_CIM_OFFSET_RAW;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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switch (chan->address) {
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case MAX9611_CHAN_TEMPERATURE:
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*val = MAX9611_TEMP_SCALE_NUM;
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*val2 = MAX9611_TEMP_SCALE_DIV;
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return IIO_VAL_FRACTIONAL;
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case MAX9611_CHAN_VOLTAGE_INPUT:
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*val = MAX9611_CIM_LSB_mV;
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return IIO_VAL_INT;
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}
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break;
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case IIO_CHAN_INFO_PROCESSED:
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switch (chan->address) {
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case MAX9611_CHAN_VOLTAGE_SENSE:
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/*
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* processed (mV): (raw - offset) * LSB (nV) / 10^6
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*
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* Even if max9611 can output raw csa voltage readings,
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* use a produced value as scale depends on gain.
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*/
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ret = max9611_read_csa_voltage(dev, &adc_data,
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&gain_selector);
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if (ret)
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return -EINVAL;
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csa_gain = max9611_gain_conf[gain_selector];
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adc_data -= csa_gain[CSA_GAIN_OFFS_RAW];
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*val = MAX9611_VOLTAGE_RAW(adc_data) *
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csa_gain[CSA_GAIN_LSB_nV];
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*val2 = 1000000;
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return IIO_VAL_FRACTIONAL;
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case MAX9611_CHAN_CURRENT_LOAD:
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/* processed (mA): Vcsa (nV) / Rshunt (uOhm) */
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ret = max9611_read_csa_voltage(dev, &adc_data,
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&gain_selector);
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if (ret)
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return -EINVAL;
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csa_gain = max9611_gain_conf[gain_selector];
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adc_data -= csa_gain[CSA_GAIN_OFFS_RAW];
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*val = MAX9611_VOLTAGE_RAW(adc_data) *
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csa_gain[CSA_GAIN_LSB_nV];
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*val2 = dev->shunt_resistor_uohm;
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return IIO_VAL_FRACTIONAL;
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case MAX9611_CHAN_POWER_LOAD:
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/*
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* processed (mW): Vin (mV) * Vcsa (uV) /
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* Rshunt (uOhm)
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*/
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ret = max9611_read_single(dev, CONF_IN_VOLT,
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&adc_data);
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if (ret)
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return -EINVAL;
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adc_data -= MAX9611_CIM_OFFSET_RAW;
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*val = MAX9611_VOLTAGE_RAW(adc_data) *
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MAX9611_CIM_LSB_mV;
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ret = max9611_read_csa_voltage(dev, &adc_data,
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&gain_selector);
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if (ret)
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return -EINVAL;
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csa_gain = max9611_gain_conf[gain_selector];
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/* divide by 10^3 here to avoid 32bit overflow */
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adc_data -= csa_gain[CSA_GAIN_OFFS_RAW];
|
||||
*val *= MAX9611_VOLTAGE_RAW(adc_data) *
|
||||
csa_gain[CSA_GAIN_LSB_nV] / 1000;
|
||||
*val2 = dev->shunt_resistor_uohm;
|
||||
|
||||
return IIO_VAL_FRACTIONAL;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static ssize_t max9611_shunt_resistor_show(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct max9611_dev *max9611 = iio_priv(dev_to_iio_dev(dev));
|
||||
unsigned int i, r;
|
||||
|
||||
i = max9611->shunt_resistor_uohm / 1000;
|
||||
r = max9611->shunt_resistor_uohm % 1000;
|
||||
|
||||
return sprintf(buf, "%u.%03u\n", i, r);
|
||||
}
|
||||
|
||||
static IIO_DEVICE_ATTR(in_power_shunt_resistor, 0444,
|
||||
max9611_shunt_resistor_show, NULL, 0);
|
||||
static IIO_DEVICE_ATTR(in_current_shunt_resistor, 0444,
|
||||
max9611_shunt_resistor_show, NULL, 0);
|
||||
|
||||
static struct attribute *max9611_attributes[] = {
|
||||
&iio_dev_attr_in_power_shunt_resistor.dev_attr.attr,
|
||||
&iio_dev_attr_in_current_shunt_resistor.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group max9611_attribute_group = {
|
||||
.attrs = max9611_attributes,
|
||||
};
|
||||
|
||||
static const struct iio_info indio_info = {
|
||||
.driver_module = THIS_MODULE,
|
||||
.read_raw = max9611_read_raw,
|
||||
.attrs = &max9611_attribute_group,
|
||||
};
|
||||
|
||||
static int max9611_init(struct max9611_dev *max9611)
|
||||
{
|
||||
struct i2c_client *client = max9611->i2c_client;
|
||||
u16 regval;
|
||||
int ret;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter,
|
||||
I2C_FUNC_SMBUS_WRITE_BYTE |
|
||||
I2C_FUNC_SMBUS_READ_WORD_DATA)) {
|
||||
dev_err(max9611->dev,
|
||||
"I2c adapter does not support smbus write_byte or read_word functionalities: aborting probe.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Make sure die temperature is in range to test communications. */
|
||||
ret = max9611_read_single(max9611, CONF_TEMP, ®val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
regval = ret & MAX9611_TEMP_MASK;
|
||||
|
||||
if ((regval > MAX9611_TEMP_MAX_POS &&
|
||||
regval < MAX9611_TEMP_MIN_NEG) ||
|
||||
regval > MAX9611_TEMP_MAX_NEG) {
|
||||
dev_err(max9611->dev,
|
||||
"Invalid value received from ADC 0x%4x: aborting\n",
|
||||
regval);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
/* Mux shall be zeroed back before applying other configurations */
|
||||
ret = i2c_smbus_write_byte_data(max9611->i2c_client,
|
||||
MAX9611_REG_CTRL1, 0);
|
||||
if (ret) {
|
||||
dev_err(max9611->dev, "i2c write byte failed: 0x%2x - 0x%2x\n",
|
||||
MAX9611_REG_CTRL1, 0);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = i2c_smbus_write_byte_data(max9611->i2c_client,
|
||||
MAX9611_REG_CTRL2, 0);
|
||||
if (ret) {
|
||||
dev_err(max9611->dev, "i2c write byte failed: 0x%2x - 0x%2x\n",
|
||||
MAX9611_REG_CTRL2, 0);
|
||||
return ret;
|
||||
}
|
||||
usleep_range(1000, 2000);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id max9611_of_table[] = {
|
||||
{.compatible = "maxim,max9611", .data = "max9611"},
|
||||
{.compatible = "maxim,max9612", .data = "max9612"},
|
||||
{ },
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(of, max9611_of_table);
|
||||
static int max9611_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
const char * const shunt_res_prop = "shunt-resistor-micro-ohms";
|
||||
const struct device_node *of_node = client->dev.of_node;
|
||||
const struct of_device_id *of_id =
|
||||
of_match_device(max9611_of_table, &client->dev);
|
||||
struct max9611_dev *max9611;
|
||||
struct iio_dev *indio_dev;
|
||||
unsigned int of_shunt;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*max9611));
|
||||
if (IS_ERR(indio_dev))
|
||||
return PTR_ERR(indio_dev);
|
||||
|
||||
i2c_set_clientdata(client, indio_dev);
|
||||
|
||||
max9611 = iio_priv(indio_dev);
|
||||
max9611->dev = &client->dev;
|
||||
max9611->i2c_client = client;
|
||||
mutex_init(&max9611->lock);
|
||||
|
||||
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;
|
||||
}
|
||||
max9611->shunt_resistor_uohm = of_shunt;
|
||||
|
||||
ret = max9611_init(max9611);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->dev.of_node = client->dev.of_node;
|
||||
indio_dev->name = of_id->data;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->info = &indio_info;
|
||||
indio_dev->channels = max9611_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(max9611_channels);
|
||||
|
||||
return devm_iio_device_register(&client->dev, indio_dev);
|
||||
}
|
||||
|
||||
static struct i2c_driver max9611_driver = {
|
||||
.driver = {
|
||||
.name = DRIVER_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = max9611_of_table,
|
||||
},
|
||||
.probe = max9611_probe,
|
||||
};
|
||||
module_i2c_driver(max9611_driver);
|
||||
|
||||
MODULE_AUTHOR("Jacopo Mondi <jacopo+renesas@jmondi.org>");
|
||||
MODULE_DESCRIPTION("Maxim max9611/12 current sense amplifier with 12bit ADC");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user