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Date: Fri, 3 Jun 2016 11:16:23 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Laxman Dewangan <ldewangan@...dia.com>, robh+dt@...nel.org,
corbet@....net, lars@...afoo.de
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, linux-iio@...r.kernel.org,
linux-hwmon@...r.kernel.org, Jean Delvare <khali@...ux-fr.org>,
Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 2/3] iio: adc: ina3221: Add support for IIO ADC driver for
TI INA3221
On 03/06/16 11:06, Jonathan Cameron wrote:
> On 01/06/16 13:34, Laxman Dewangan wrote:
>> The INA3221 is a three-channel, high-side current and bus voltage monitor
>> with an I2C interface from Texas Instruments. The INA3221 monitors both
>> shunt voltage drops and bus supply voltages in addition to having
>> programmable conversion times and averaging modes for these signals.
>> The INA3221 offers both critical and warning alerts to detect multiple
>> programmable out-of-range conditions for each channel.
>>
>> Add support for INA3221 SW driver via IIO ADC interface. The device is
>> register as iio-device and provides interface for voltage/current and power
>> monitor. Also provide interface for setting oneshot/continuous mode and
>> critical/warning threshold for the shunt voltage drop.
>>
>> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> Hi Laxman,
>
> As ever with any driver lying on the border of IIO and hwmon, please include
> a short justification of why you need an IIO driver and also cc the
> hwmon list + maintainers. (cc'd on this reply).
>
> I simply won't take a driver where the hwmon maintainers aren't happy.
> As it stands I'm not seeing obvious reasons in the code for why this
> should be an IIO device.
>
> Funily enough I know this datasheet a little as was evaluating
> it for use on some boards at the day job a week or so ago.
>
> Various comments inline. Major points are:
> * Don't use 'fake' channels to control events. If the events infrastructure
> doesn't handle your events, then fix that rather than working around it.
> * There is a lot of ABI in here concerned with oneshot vs continuous.
> This seems to me to be more than it should be. We wouldn't expect to
> see stuff changing as a result of switching between these modes other
> than wrt to when the data shows up. So I'd expect to not see this
> directly exposed at all - but rather sit in oneshot unless either:
> 1) Buffered mode is running (not currently supported)
> 2) Alerts are on - which I think requires it to be in continuous mode.
>
> Other question to my mind is whether we should be reporting vshunt or
> (using device tree to pass resistance) current.
>
> Code looks good, bu these more fundamental bits need sorting.
Another minor point - why do the power calculations in driver?
no hardware support for it, so why not just leave it to userspace?
>
> Thanks,
>
> Jonathan
>> ---
>> drivers/iio/adc/Kconfig | 12 +
>> drivers/iio/adc/Makefile | 1 +
>> drivers/iio/adc/ina3221.c | 1175 +++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 1188 insertions(+)
>> create mode 100644 drivers/iio/adc/ina3221.c
>>
>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
>> index 25378c5..65f3c27 100644
>> --- a/drivers/iio/adc/Kconfig
>> +++ b/drivers/iio/adc/Kconfig
>> @@ -223,6 +223,18 @@ config INA2XX_ADC
>> Say yes here to build support for TI INA2xx family of Power Monitors.
>> This driver is mutually exclusive with the HWMON version.
>>
>> +config INA3221
>> + tristate "TI INA3221 3-Channel Shunt and Bus Voltage Monitor"
>> + depends on I2C
>> + select REGMAP_I2C
>> + help
>> + INA3221 is Triple-Channel, High-Side Measurement, Shunt and Bus
>> + Voltage Monitor device from TI. This driver support the reading
>> + of all channel's voltage/current and power via IIO interface.
>> + Say yes here to build support for TI INA3221. To compile this
>> + driver as a module, choose M here: the module will be called
>> + ina3221.
>> +
>> config IMX7D_ADC
>> tristate "IMX7D ADC driver"
>> depends on ARCH_MXC || COMPILE_TEST
>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
>> index 38638d4..c24f455 100644
>> --- a/drivers/iio/adc/Makefile
>> +++ b/drivers/iio/adc/Makefile
>> @@ -24,6 +24,7 @@ obj-$(CONFIG_FSL_MX25_ADC) += fsl-imx25-gcq.o
>> obj-$(CONFIG_HI8435) += hi8435.o
>> obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
>> obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
>> +obj-$(CONFIG_INA3221) += ina3221.o
>> obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
>> obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
>> obj-$(CONFIG_MAX1027) += max1027.o
>> diff --git a/drivers/iio/adc/ina3221.c b/drivers/iio/adc/ina3221.c
>> new file mode 100644
>> index 0000000..a17f688
>> --- /dev/null
>> +++ b/drivers/iio/adc/ina3221.c
>> @@ -0,0 +1,1175 @@
>> +/*
>> + * IIO driver for INA3221
>> + *
>> + * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
>> + *
>> + * 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.
>> + */
>> +
>> +#include <linux/delay.h>
>> +#include <linux/i2c.h>
>> +#include <linux/iio/kfifo_buf.h>
>> +#include <linux/iio/sysfs.h>
>> +#include <linux/module.h>
>> +#include <linux/regmap.h>
>> +#include <linux/util_macros.h>
>> +
>> +/* INA3221 registers definition */
>> +#define INA3221_CONFIG 0x00
>> +#define INA3221_SHUNT_VOL_CHAN1 0x01
>> +#define INA3221_BUS_VOL_CHAN1 0x02
>> +#define INA3221_SHUNT_VOL_CHAN2 0x03
>> +#define INA3221_BUS_VOL_CHAN2 0x04
>> +#define INA3221_SHUNT_VOL_CHAN3 0x05
>> +#define INA3221_BUS_VOL_CHAN3 0x06
>> +#define INA3221_CRIT_CHAN1 0x07
>> +#define INA3221_WARN_CHAN1 0x08
>> +#define INA3221_CRIT_CHAN2 0x09
>> +#define INA3221_WARN_CHAN2 0x0A
>> +#define INA3221_CRIT_CHAN3 0x0B
>> +#define INA3221_WARN_CHAN3 0x0C
>> +#define INA3221_MASK_ENABLE 0x0F
>> +#define INA3221_POWER_VALID_UPPER_LIMIT 0x10
>> +#define INA3221_POWER_VALID_LOWER_LIMIT 0x11
>> +#define INA3221_MAN_ID 0xFE
>> +#define INA3221_DEV_ID 0xFF
>> +
>> +#define INA3221_CONFIG_RESET_MASK BIT(15)
>> +#define INA3221_CONFIG_RESET_EN BIT(15)
>> +
>> +#define INA3221_CONFIG_MODE_MASK GENMASK(2, 0)
>> +#define INA3221_CONFIG_MODE_POWER_DOWN 0
>> +
>> +#define INA3221_CONFIG_AVG_MASK GENMASK(11, 9)
>> +#define INA3221_CONFIG_AVG(val) ((val) << 9)
>> +
>> +#define INA3221_CONFIG_VBUSCT_MASK GENMASK(8, 6)
>> +#define INA3221_CONFIG_VBUSCT(val) ((val) << 6)
>> +
>> +#define INA3221_CONFIG_SHUNTCT_MASK GENMASK(5, 3)
>> +#define INA3221_CONFIG_SHUNTCT(val) ((val) << 3)
>> +
>> +#define INA3221_REG_MASK_WEN BIT(11)
>> +#define INA3221_REG_MASK_CEN BIT(10)
>> +#define INA3221_REG_MASK_CVRF BIT(0)
>> +
>> +#define PACK_MODE_CHAN(mode, chan) ((mode) | ((chan) << 8))
>> +#define UNPACK_MODE(address) ((address) & 0xFF)
>> +#define UNPACK_CHAN(address) (((address) >> 8) & 0xFF)
>> +
>> +#define INA3221_NUMBER_OF_CHANNELS 3
>> +#define INA3221_MAX_CONVERSION_TRIALS 10
>> +#define INA3221_CONFIG_AVG_SAMPLE_DEFAULT 4
>> +#define INA3221_CONFIG_VBUS_CONV_TIME_DEFAULT 150
>> +#define INA3221_CONFIG_SHUNT_CONV_TIME_DEFAULT 150
>> +
>> +#define INA3221_SHUNT_VOL(i) (INA3221_SHUNT_VOL_CHAN1 + (i) * 2)
>> +#define INA3221_BUS_VOL(i) (INA3221_BUS_VOL_CHAN1 + (i) * 2)
>> +#define INA3221_CRIT(i) (INA3221_CRIT_CHAN1 + (i) * 2)
>> +#define INA3221_WARN(i) (INA3221_WARN_CHAN1 + (i) * 2)
>> +
>> +static const struct regmap_range ina3221_readable_ranges[] = {
>> + regmap_reg_range(INA3221_CONFIG, INA3221_POWER_VALID_LOWER_LIMIT),
>> + regmap_reg_range(INA3221_MAN_ID, INA3221_DEV_ID),
>> +};
>> +
>> +static const struct regmap_access_table ina3221_readable_table = {
>> + .yes_ranges = ina3221_readable_ranges,
>> + .n_yes_ranges = ARRAY_SIZE(ina3221_readable_ranges),
>> +};
>> +
>> +static const struct regmap_range ina3221_no_writable_ranges[] = {
>> + regmap_reg_range(INA3221_SHUNT_VOL_CHAN1, INA3221_BUS_VOL_CHAN3),
>> +};
>> +
>> +static const struct regmap_access_table ina3221_writable_table = {
>> + .no_ranges = ina3221_no_writable_ranges,
>> + .n_no_ranges = ARRAY_SIZE(ina3221_no_writable_ranges),
>> +};
>> +
>> +static const struct regmap_range ina3221_no_volatile_ranges[] = {
>> + regmap_reg_range(INA3221_CONFIG, INA3221_CONFIG),
>> + regmap_reg_range(INA3221_CRIT_CHAN1, INA3221_WARN_CHAN3),
>> + regmap_reg_range(INA3221_POWER_VALID_UPPER_LIMIT,
>> + INA3221_POWER_VALID_LOWER_LIMIT),
>> + regmap_reg_range(INA3221_MAN_ID, INA3221_DEV_ID),
>> +};
>> +
>> +static const struct regmap_access_table ina3221_volatile_table = {
>> + .no_ranges = ina3221_no_volatile_ranges,
>> + .n_no_ranges = ARRAY_SIZE(ina3221_no_volatile_ranges),
>> +};
>> +
>> +static const struct regmap_config ina3221_regmap_config = {
>> + .reg_bits = 8,
>> + .val_bits = 16,
>> + .max_register = INA3221_DEV_ID + 1,
>> + .rd_table = &ina3221_readable_table,
>> + .wr_table = &ina3221_writable_table,
>> + .volatile_table = &ina3221_volatile_table,
>> +};
>> +
>> +struct ina3221_channel_data {
>> + const char *name;
>> + int warn_limits;
>> + int crit_limits;
>> + int shunt_resistance;
>> +};
>> +
>> +struct ina3221_platform_data {
>> + struct ina3221_channel_data channel_data[INA3221_NUMBER_OF_CHANNELS];
>> + bool enable_power;
>> + int oneshot_avg_sample;
>> + int oneshot_vbus_conv_time;
>> + int oneshot_shunt_conv_time;
>> + int cont_avg_sample;
>> + int cont_vbus_conv_time;
>> + int cont_shunt_conv_time;
>> + int continuous_mode;
>> + bool warn_alert;
>> + bool crit_alert;
>> + int active_channel;
>> +};
>> +
>> +struct ina3221_chip_info {
>> + struct device *dev;
>> + struct regmap *rmap;
>> + int oneshot_config;
>> + int continuous_config;
>> + int continuous_mode;
>> + struct mutex state_lock;
>> + struct ina3221_platform_data *pdata;
>> +};
>> +
>> +enum ina3221_address {
>> + INA3221_CHANNEL_NAME,
>> + INA3221_CRIT_CURRENT_LIMIT,
>> + INA3221_WARN_CURRENT_LIMIT,
>> + INA3221_MEASURED_VALUE,
>> + INA3221_OPERATING_MODE,
>> + INA3221_OVERSAMPLING_RATIO,
>> + INA3221_VBUS_CONV_TIME,
>> + INA3221_VSHUNT_CONV_TIME,
>> + INA3221_CHANNEL_ONESHOT,
>> + INA3221_CHANNEL_CONTINUOUS,
>> +};
>> +
>> +static inline int shuntv_register_to_uv(u16 reg)
>> +{
>> + int ret = (s16)reg;
>> +
>> + return (ret >> 3) * 40;
>> +}
>> +
>> +static inline u16 uv_to_shuntv_register(s32 uv)
>> +{
>> + return (u16)(uv / 5);
>> +}
>> +
>> +static inline int busv_register_to_mv(u16 reg)
>> +{
>> + int ret = (s16)reg;
>> +
>> + return (ret >> 3) * 8;
>> +}
>> +
>> +/* convert shunt voltage register value to current (in mA) */
>> +static int shuntv_register_to_ma(u16 reg, int resistance)
>> +{
>> + int uv, ma;
>> +
>> + uv = (s16)reg;
>> + uv = ((uv >> 3) * 40); /* LSB (4th bit) is 40uV */
>> + /*
>> + * calculate uv/resistance with rounding knowing that C99 truncates
>> + * towards zero
>> + */
>> + if (uv > 0)
>> + ma = ((uv * 2 / resistance) + 1) / 2;
>> + else
>> + ma = ((uv * 2 / resistance) - 1) / 2;
>> + return ma;
>> +}
>> +
>> +static int ina3221_get_closest_index(const int *list, int n_list,
>> + int val)
>> +{
>> + if (val > list[n_list - 1] || (val < list[0]))
>> + return -EINVAL;
>> +
>> + return find_closest(val, list, n_list);
>> +}
>> +
>> +/*
>> + * Available averaging rates for INA3221. The indices correspond with
>> + * the bit values expected by the chip (according to the INA3221 datasheet,
>> + * table 3 AVG bit settings, found at
>> + */
>> +static const int ina3221_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024};
>> +
>> +static int ina3221_set_average(struct ina3221_chip_info *chip, unsigned int val,
>> + unsigned int *config)
>> +{
>> + int bits;
>> +
>> + bits = ina3221_get_closest_index(ina3221_avg_tab,
>> + ARRAY_SIZE(ina3221_avg_tab), val);
>> + if (bits < 0)
>> + return bits;
>> +
>> + *config &= ~INA3221_CONFIG_AVG_MASK;
>> + *config |= INA3221_CONFIG_AVG(bits) & INA3221_CONFIG_AVG_MASK;
>> +
>> + return 0;
>> +}
>> +
>> +/* Conversion times in uS */
>> +static const int ina3221_conv_time_tab[] = { 140, 204, 332, 588, 1100,
>> + 2116, 4156, 8244};
>> +
>> +static int ina3221_set_int_time_vbus(struct ina3221_chip_info *chip,
>> + unsigned int val_us, unsigned int *config)
>> +{
>> + int bits;
>> +
>> + bits = ina3221_get_closest_index(ina3221_conv_time_tab,
>> + ARRAY_SIZE(ina3221_conv_time_tab),
>> + val_us);
>> + if (bits < 0)
>> + return bits;
>> +
>> + *config &= ~INA3221_CONFIG_VBUSCT_MASK;
>> + *config |= INA3221_CONFIG_VBUSCT(bits) & INA3221_CONFIG_VBUSCT_MASK;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_set_int_time_vshunt(struct ina3221_chip_info *chip,
>> + unsigned int val_us,
>> + unsigned int *config)
>> +{
>> + int bits;
>> +
>> + bits = ina3221_get_closest_index(ina3221_conv_time_tab,
>> + ARRAY_SIZE(ina3221_conv_time_tab),
>> + val_us);
>> + if (bits < 0)
>> + return bits;
>> +
>> + *config &= ~INA3221_CONFIG_SHUNTCT_MASK;
>> + *config |= INA3221_CONFIG_SHUNTCT(bits) & INA3221_CONFIG_SHUNTCT_MASK;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_do_one_shot_conversion(struct ina3221_chip_info *chip,
>> + int chan, u16 *vbus, u16 *vsh)
>> +{
>> + unsigned int value;
>> + int trials = 0;
>> + int ret;
>> + int conv_time;
>> +
>> + conv_time = max(chip->pdata->oneshot_vbus_conv_time,
>> + chip->pdata->oneshot_shunt_conv_time);
>> +
>> + ret = regmap_write(chip->rmap, INA3221_CONFIG, chip->oneshot_config);
>> + if (ret < 0)
>> + return 0;
>> +
>> + /* Read conversion status */
>> + do {
>> + ret = regmap_read(chip->rmap, INA3221_MASK_ENABLE, &value);
>> + if (ret < 0) {
>> + dev_err(chip->dev,
>> + "Failed to read conversion status: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + if (value & INA3221_REG_MASK_CVRF)
>> + break;
>> + usleep_range(conv_time, conv_time * 2);
>> + } while (++trials < INA3221_MAX_CONVERSION_TRIALS);
>> +
>> + if (trials == INA3221_MAX_CONVERSION_TRIALS) {
>> + dev_err(chip->dev,
>> + "Conversion not completed for maximum trials\n");
>> + return -EAGAIN;
>> + }
>> +
>> + if (vsh) {
>> + ret = regmap_read(chip->rmap, INA3221_SHUNT_VOL(chan), &value);
>> + if (ret < 0)
>> + return ret;
>> + *vsh = (u16)value;
>> + }
>> +
>> + if (vbus) {
>> + ret = regmap_read(chip->rmap, INA3221_BUS_VOL(chan), &value);
>> + if (ret < 0)
>> + return ret;
>> + *vbus = (u16)value;
>> + }
>> +
>> + ret = regmap_write(chip->rmap, INA3221_CONFIG, 0);
>> + if (ret < 0)
>> + return ret;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_read_continuous_conversion(struct ina3221_chip_info *chip,
>> + int chan, u16 *vbus, u16 *vsh)
>> +{
>> + unsigned int value;
>> + int ret;
>> +
>> + if (vsh) {
>> + ret = regmap_read(chip->rmap, INA3221_SHUNT_VOL(chan), &value);
>> + if (ret < 0)
>> + return ret;
>> + *vsh = (u16)value;
>> + }
>> +
>> + if (vbus) {
>> + ret = regmap_read(chip->rmap, INA3221_BUS_VOL(chan), &value);
>> + if (ret < 0)
>> + return ret;
>> + *vbus = (u16)value;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int ina3221_read_vbus_vshunt(struct ina3221_chip_info *chip,
>> + int ch, u16 *vbus, u16 *vsh)
>> +{
>> + if (chip->continuous_mode)
>> + return ina3221_read_continuous_conversion(chip, ch, vbus, vsh);
>> +
>> + return ina3221_do_one_shot_conversion(chip, ch, vbus, vsh);
>> +}
>> +
>> +static int ina3221_get_channel_voltage(struct ina3221_chip_info *chip,
>> + int chan, int *voltage_uv)
>> +{
>> + u16 vbus;
>> + int ret;
>> +
>> + ret = ina3221_read_vbus_vshunt(chip, chan, &vbus, NULL);
>> + if (ret < 0)
>> + return ret;
>> +
>> + *voltage_uv = busv_register_to_mv(vbus) * 1000;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_get_channel_current(struct ina3221_chip_info *chip,
>> + int chan, int *current_ua)
>> +{
>> + int shunt_res = chip->pdata->channel_data[chan].shunt_resistance;
>> + u16 vsh;
>> + int ret;
>> +
>> + ret = ina3221_do_one_shot_conversion(chip, chan, NULL, &vsh);
>> + if (ret < 0)
>> + return ret;
>> +
>> + *current_ua = shuntv_register_to_ma(vsh, shunt_res) * 1000;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_get_channel_power(struct ina3221_chip_info *chip,
>> + int chan, int *power_uw)
>> +{
>> + int shunt_res = chip->pdata->channel_data[chan].shunt_resistance;
>> + u16 vbus, vsh;
>> + int ret;
>> + int current_ma, voltage_mv;
>> +
>> + ret = ina3221_do_one_shot_conversion(chip, chan, &vbus, &vsh);
>> + if (ret < 0)
>> + return ret;
>> +
>> + current_ma = shuntv_register_to_ma(vsh, shunt_res);
>> + voltage_mv = busv_register_to_mv(vbus);
>> + *power_uw = (voltage_mv * current_ma);
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_get_channel_critical(struct ina3221_chip_info *chip,
>> + int chan, int *curr_limit_ua)
>> +{
>> + *curr_limit_ua = chip->pdata->channel_data[chan].crit_limits;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_set_channel_critical(struct ina3221_chip_info *chip,
>> + int chan, int crit_limit_ua)
>> +{
>> + int s_res = chip->pdata->channel_data[chan].shunt_resistance;
>> + int shunt_volt_limit;
>> + int crit_limit = crit_limit_ua / 1000;
>> + int ret;
>> +
>> + if (crit_limit < 0)
>> + return 0;
>> +
>> + shunt_volt_limit = crit_limit * s_res;
>> + shunt_volt_limit = uv_to_shuntv_register(shunt_volt_limit);
>> +
>> + ret = regmap_write(chip->rmap, INA3221_CRIT(chan), shunt_volt_limit);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to write critical reg 0x%02x: %d\n",
>> + INA3221_CRIT(chan), ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_read_default_channel_critical(struct ina3221_chip_info *chip,
>> + int chan, int *shunt_curr_ua)
>> +{
>> + int shunt_res = chip->pdata->channel_data[chan].shunt_resistance;
>> + int shunt_volt;
>> + unsigned int value;
>> + int ret;
>> +
>> + if (shunt_res <= 0) {
>> + dev_err(chip->dev, "Channel %d have invalid shunt resistor\n",
>> + chan);
>> + return -EINVAL;
>> + }
>> +
>> + ret = regmap_read(chip->rmap, INA3221_CRIT(chan), &value);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to read critical reg 0x%02x: %d\n",
>> + INA3221_CRIT(chan), ret);
>> + return ret;
>> + }
>> + shunt_volt = shuntv_register_to_uv((u16)value);
>> + *shunt_curr_ua = (shunt_volt / shunt_res) * 1000;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_get_channel_warning(struct ina3221_chip_info *chip,
>> + int chan, int *curr_limit_ua)
>> +{
>> + *curr_limit_ua = chip->pdata->channel_data[chan].warn_limits;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_set_channel_warning(struct ina3221_chip_info *chip,
>> + int chan, int warn_limit_ua)
>> +{
>> + int s_res = chip->pdata->channel_data[chan].shunt_resistance;
>> + int shunt_volt_limit;
>> + int warn_limit = warn_limit_ua / 1000;
>> + int ret;
>> +
>> + if (warn_limit < 0)
>> + return 0;
>> +
>> + shunt_volt_limit = warn_limit * s_res;
>> + shunt_volt_limit = uv_to_shuntv_register(shunt_volt_limit);
>> +
>> + ret = regmap_write(chip->rmap, INA3221_WARN(chan), shunt_volt_limit);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to write warning reg 0x%02x: %d\n",
>> + INA3221_CRIT(chan), ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_read_default_channel_warning(struct ina3221_chip_info *chip,
>> + int chan, int *shunt_curr_ua)
>> +{
>> + int shunt_res = chip->pdata->channel_data[chan].shunt_resistance;
>> + int shunt_volt;
>> + unsigned int value;
>> + int ret;
>> +
>> + if (shunt_res <= 0) {
>> + dev_err(chip->dev, "Channel %d have invalid shunt resistor\n",
>> + chan);
>> + return -EINVAL;
>> + }
>> +
>> + ret = regmap_read(chip->rmap, INA3221_WARN(chan), &value);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to read critical reg 0x%02x: %d\n",
>> + INA3221_CRIT(chan), ret);
>> + return ret;
>> + }
>> + shunt_volt = shuntv_register_to_uv((u16)value);
>> + *shunt_curr_ua = (shunt_volt / shunt_res) * 1000;
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_get_operating_mode(struct ina3221_chip_info *chip)
>> +{
>> + return chip->continuous_mode;
>> +}
>> +
>> +static int ina3221_set_operating_mode(struct ina3221_chip_info *chip,
>> + int is_continuous)
>> +{
>> + unsigned int mask, val;
>> + int ret;
>> +
>> + if (!is_continuous) {
>> + ret = regmap_write(chip->rmap, INA3221_CONFIG, 0);
>> + if (ret < 0) {
>> + dev_err(chip->dev,
>> + "Failed to set mode of device: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + goto done;
>> + }
>> +
>> + if ((chip->pdata->warn_alert || chip->pdata->crit_alert)) {
>> + mask = INA3221_REG_MASK_CEN | INA3221_REG_MASK_WEN;
>> + val = (chip->pdata->warn_alert) ? INA3221_REG_MASK_WEN : 0;
>> + val |= (chip->pdata->crit_alert) ? INA3221_REG_MASK_CEN : 0;
>> +
>> + ret = regmap_update_bits(chip->rmap, INA3221_MASK_ENABLE,
>> + mask, val);
>> + if (ret < 0) {
>> + dev_err(chip->dev,
>> + "Failed to enable warn/crit alert: %d\n", ret);
>> + return ret;
>> + }
>> + }
>> +
>> + ret = regmap_write(chip->rmap, INA3221_CONFIG, chip->continuous_config);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to set cont mode: %d\n", ret);
>> + return ret;
>> + }
>> +
>> +done:
>> + chip->continuous_mode = is_continuous;
>> +
>> + return ret;
>> +}
>> +
>> +static int ina3221_read_raw(struct iio_dev *indio_dev,
>> + struct iio_chan_spec const *cspec,
>> + int *val, int *val2, long mask)
>> +{
>> + struct ina3221_chip_info *chip = iio_priv(indio_dev);
>> + int ch = cspec->channel;
>> + int ret = -EINVAL;
>> +
>> + if (mask != IIO_CHAN_INFO_PROCESSED)
>> + return -EINVAL;
>> +
>> + mutex_lock(&chip->state_lock);
>> +
>> + switch (cspec->type) {
>> + case IIO_VOLTAGE:
>> + ret = ina3221_get_channel_voltage(chip, ch, val);
>> + break;
>> +
>> + case IIO_CURRENT:
>> + switch (cspec->address) {
>> + case INA3221_MEASURED_VALUE:
>> + ret = ina3221_get_channel_current(chip, ch, val);
>> + break;
>> +
>> + case INA3221_CRIT_CURRENT_LIMIT:
>> + ret = ina3221_get_channel_critical(chip, ch, val);
>> + break;
>> +
>> + case INA3221_WARN_CURRENT_LIMIT:
>> + ret = ina3221_get_channel_warning(chip, ch, val);
>> + break;
>> + }
>> + break;
>> +
>> + case IIO_POWER:
>> + ret = ina3221_get_channel_power(chip, ch, val);
>> + break;
>> +
>> + default:
>> + break;
>> + }
>> +
>> + mutex_unlock(&chip->state_lock);
>> +
>> + return (ret < 0) ? ret : IIO_VAL_INT;
>> +}
>> +
>> +static int ina3221_write_raw(struct iio_dev *indio_dev,
>> + struct iio_chan_spec const *cspec,
>> + int val, int val2, long mask)
>> +{
>> + struct ina3221_chip_info *chip = iio_priv(indio_dev);
>> + int ch = cspec->channel;
>> + int ret = -EINVAL;
>> +
>> + if (mask != IIO_CHAN_INFO_PROCESSED)
>> + return -EINVAL;
>> +
>> + if (cspec->type != IIO_CURRENT)
>> + return -EINVAL;
>> +
>> + mutex_lock(&chip->state_lock);
>> + switch (cspec->address) {
>> + case INA3221_CRIT_CURRENT_LIMIT:
>> + ret = ina3221_set_channel_critical(chip, ch, val);
>> + if (!ret)
>> + chip->pdata->channel_data[ch].crit_limits = val;
>> + break;
>> +
>> + case INA3221_WARN_CURRENT_LIMIT:
>> + ret = ina3221_set_channel_warning(chip, ch, val);
>> + if (!ret)
>> + chip->pdata->channel_data[ch].warn_limits = val;
>> + break;
>> +
>> + default:
>> + break;
>> + }
>> +
>> + mutex_unlock(&chip->state_lock);
>> +
>> + return ret;
>> +}
>> +
>> +static ssize_t ina3221_show_channel(struct device *dev,
>> + struct device_attribute *attr, char *buf)
>> +{
>> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>> + struct ina3221_chip_info *chip = iio_priv(indio_dev);
>> + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
>> + int mode = UNPACK_MODE(this_attr->address);
>> + int address = UNPACK_CHAN(this_attr->address);
>> + int ret;
>> + int val;
>> +
>> + switch (mode) {
>> + case INA3221_CHANNEL_NAME:
>> + return snprintf(buf, PAGE_SIZE, "%s\n",
>> + chip->pdata->channel_data[address].name);
>> +
>> + case INA3221_OPERATING_MODE:
>> + ret = ina3221_get_operating_mode(chip);
>> + if (ret)
>> + return snprintf(buf, PAGE_SIZE, "continuous\n");
>> + return snprintf(buf, PAGE_SIZE, "oneshot\n");
>> +
>> + case INA3221_OVERSAMPLING_RATIO:
>> + if (address == INA3221_CHANNEL_ONESHOT)
>> + val = chip->pdata->oneshot_avg_sample;
>> + else
>> + val = chip->pdata->cont_avg_sample;
>> + return snprintf(buf, PAGE_SIZE, "%d\n", val);
>> +
>> + case INA3221_VBUS_CONV_TIME:
>> + if (address == INA3221_CHANNEL_ONESHOT)
>> + val = chip->pdata->oneshot_vbus_conv_time;
>> + else
>> + val = chip->pdata->cont_vbus_conv_time;
>> + return snprintf(buf, PAGE_SIZE, "%d\n", val);
>> +
>> + case INA3221_VSHUNT_CONV_TIME:
>> + if (address == INA3221_CHANNEL_ONESHOT)
>> + val = chip->pdata->oneshot_shunt_conv_time;
>> + else
>> + val = chip->pdata->cont_shunt_conv_time;
>> + return snprintf(buf, PAGE_SIZE, "%d\n", val);
>> +
>> + default:
>> + break;
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static ssize_t ina3221_set_channel(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t len)
>> +{
>> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>> + struct ina3221_chip_info *chip = iio_priv(indio_dev);
>> + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
>> + int mode = UNPACK_MODE(this_attr->address);
>> + int address = UNPACK_CHAN(this_attr->address);
> I'd personally use address as an index into an array of static const
> struct. Leads to slightly easier to read and more extensible code.
>
> Minor point though.
>> + int o_conf, c_conf;
>> + long val;
>> + int *cont_param = NULL;
>> + int ret = -EINVAL;
>> +
>> + if (mode == INA3221_OPERATING_MODE) {
>> + val = ((*buf == 'c') || (*buf == 'C')) ? 1 : 0;
>> + } else {
>> + if (kstrtol(buf, 10, &val) < 0)
>> + return -EINVAL;
>> + }
>> +
>> + mutex_lock(&chip->state_lock);
>> +
>> + o_conf = chip->oneshot_config;
>> + c_conf = chip->continuous_config;
>> +
>> + switch (mode) {
>> + case INA3221_OPERATING_MODE:
>> + if (chip->continuous_mode == val)
>> + break;
>> +
>> + ret = ina3221_set_operating_mode(chip, val);
>> + break;
>> +
>> + case INA3221_OVERSAMPLING_RATIO:
>> + if (address == INA3221_CHANNEL_ONESHOT) {
>> + ret = ina3221_set_average(chip, val, &o_conf);
>> + if (!ret)
>> + chip->pdata->oneshot_avg_sample = val;
>> + } else {
>> + ret = ina3221_set_average(chip, val, &c_conf);
>> + if (!ret)
>> + cont_param = &chip->pdata->cont_avg_sample;
>> + }
>> + break;
>> +
>> + case INA3221_VBUS_CONV_TIME:
>> + if (address == INA3221_CHANNEL_ONESHOT) {
>> + ret = ina3221_set_int_time_vbus(chip, val, &o_conf);
>> + if (!ret)
>> + chip->pdata->oneshot_vbus_conv_time = val;
>> + } else {
>> + ret = ina3221_set_int_time_vbus(chip, val, &c_conf);
>> + if (!ret)
>> + cont_param = &chip->pdata->cont_vbus_conv_time;
>> + }
>> + break;
>> +
>> + case INA3221_VSHUNT_CONV_TIME:
>> + if (address == INA3221_CHANNEL_ONESHOT) {
>> + ret = ina3221_set_int_time_vshunt(chip, val, &o_conf);
>> + if (!ret)
>> + chip->pdata->oneshot_shunt_conv_time = val;
>> + } else {
>> + ret = ina3221_set_int_time_vshunt(chip, val, &c_conf);
>> + if (!ret)
>> + cont_param = &chip->pdata->cont_shunt_conv_time;
>> + }
>> + break;
>> +
>> + default:
>> + break;
>> + }
>> +
>> + if (ret < 0)
>> + goto exit;
>> +
>> + chip->oneshot_config = o_conf;
>> + if (chip->continuous_mode && chip->continuous_config != c_conf) {
>> + ret = regmap_write(chip->rmap, INA3221_CONFIG, c_conf);
>> + if (ret < 0)
>> + goto exit;
>> + }
>> + chip->continuous_config = c_conf;
>> + if (cont_param)
>> + *cont_param = val;
>> +
>> +exit:
>> + mutex_unlock(&chip->state_lock);
>> +
>> + return len;
>> +}
>> +
>> +static IIO_DEVICE_ATTR(rail_name_0, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_CHANNEL_NAME, 0));
>> +
>> +static IIO_DEVICE_ATTR(rail_name_1, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_CHANNEL_NAME, 1));
>> +
>> +static IIO_DEVICE_ATTR(rail_name_2, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_CHANNEL_NAME, 2));
>> +
>> +static IIO_DEVICE_ATTR(operating_mode, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_OPERATING_MODE, 0));
>> +
>> +static IIO_DEVICE_ATTR(oneshot_oversampling_ratio, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_OVERSAMPLING_RATIO,
>> + INA3221_CHANNEL_ONESHOT));
>> +
>> +static IIO_DEVICE_ATTR(continuous_oversampling_ratio, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_OVERSAMPLING_RATIO,
>> + INA3221_CHANNEL_CONTINUOUS));
>> +
>> +static IIO_DEVICE_ATTR(oneshot_vbus_conv_time, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_VBUS_CONV_TIME,
>> + INA3221_CHANNEL_ONESHOT));
>> +
>> +static IIO_DEVICE_ATTR(continuous_vbus_conv_time, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_VBUS_CONV_TIME,
>> + INA3221_CHANNEL_CONTINUOUS));
>> +
>> +static IIO_DEVICE_ATTR(oneshot_vshunt_conv_time, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_VSHUNT_CONV_TIME,
>> + INA3221_CHANNEL_ONESHOT));
>> +
>> +static IIO_DEVICE_ATTR(continuous_vshunt_conv_time, S_IRUGO | S_IWUSR,
>> + ina3221_show_channel, ina3221_set_channel,
>> + PACK_MODE_CHAN(INA3221_VSHUNT_CONV_TIME,
>> + INA3221_CHANNEL_CONTINUOUS));
>> +
>> +static struct attribute *ina3221_attributes[] = {
>> + &iio_dev_attr_rail_name_0.dev_attr.attr,
>> + &iio_dev_attr_rail_name_1.dev_attr.attr,
>> + &iio_dev_attr_rail_name_2.dev_attr.attr,
>> + &iio_dev_attr_oneshot_oversampling_ratio.dev_attr.attr,
>> + &iio_dev_attr_continuous_oversampling_ratio.dev_attr.attr,
>> + &iio_dev_attr_oneshot_vbus_conv_time.dev_attr.attr,
>> + &iio_dev_attr_continuous_vbus_conv_time.dev_attr.attr,
>> + &iio_dev_attr_oneshot_vshunt_conv_time.dev_attr.attr,
>> + &iio_dev_attr_continuous_vshunt_conv_time.dev_attr.attr,
>> + &iio_dev_attr_operating_mode.dev_attr.attr,
> Was about to complain about docs then noticed patch 3. There's a lot
> here and it's mostly non standard.. hmm.
>> + NULL,
>> +};
>> +
>> +static const struct attribute_group ina3221_groups = {
>> + .attrs = ina3221_attributes,
>> +};
>> +
>> +#define channel_type(_type, _add, _channel, _name) { \
>> + .type = _type, \
>> + .indexed = 1, \
>> + .address = _add, \
>> + .channel = _channel, \
>> + .extend_name = _name, \
>> + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) \
>> +}
>> +
>> +#define channel_spec(ch) \
>> + channel_type(IIO_VOLTAGE, 0, ch, NULL), \
>> + channel_type(IIO_CURRENT, INA3221_MEASURED_VALUE, ch, NULL), \
>> + channel_type(IIO_CURRENT, INA3221_CRIT_CURRENT_LIMIT, ch, "warning"), \
>> + channel_type(IIO_CURRENT, INA3221_WARN_CURRENT_LIMIT, ch, "critical"), \
> These aren't channels that I can see but rather events on a given channel.
> There's an issue here as well in that IIO doesn't currently support two
> events of the same type on a single channel - our event codes have no
> way of distguishing between them. This needs fixing but we haven't done
> it yet.
>
> Also these particular events do make this seem rather more or a power
> monitoring chip than we'd normally expect to see in IIO - hence the
> need for that justification in the patch description ;)
>> + channel_type(IIO_POWER, 0, ch, NULL)
>> +
>> +static const struct iio_chan_spec ina3221_channels_spec[] = {
>> + channel_spec(0),
>> + channel_spec(1),
>> + channel_spec(2),
>> +};
>> +
>> +static const struct iio_info ina3221_info = {
>> + .driver_module = THIS_MODULE,
>> + .attrs = &ina3221_groups,
>> + .read_raw = ina3221_read_raw,
>> + .write_raw = ina3221_write_raw,
>> +};
>> +
>> +static int ina3221_process_pdata(struct ina3221_chip_info *chip,
>> + struct ina3221_platform_data *pdata)
>> +{
>> + unsigned int o_conf;
>> + unsigned int c_conf;
>> + int ret;
>> +
>> + o_conf = 0x7 << 12;
>> + c_conf = pdata->active_channel << 12;
>> +
>> + o_conf |= (chip->pdata->enable_power) ? 0x3 : 0x2;
>> + c_conf |= (chip->pdata->enable_power) ? 0x7 : 0x6;
>> +
>> + ret = ina3221_set_average(chip, pdata->oneshot_avg_sample, &o_conf);
>> + if (ret < 0)
>> + return ret;
>> + ret = ina3221_set_average(chip, pdata->cont_avg_sample, &c_conf);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = ina3221_set_int_time_vbus(chip, pdata->oneshot_vbus_conv_time,
>> + &o_conf);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = ina3221_set_int_time_vbus(chip, pdata->cont_vbus_conv_time,
>> + &c_conf);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = ina3221_set_int_time_vshunt(chip, pdata->oneshot_shunt_conv_time,
>> + &o_conf);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = ina3221_set_int_time_vshunt(chip, pdata->cont_shunt_conv_time,
>> + &c_conf);
>> + if (ret < 0)
>> + return ret;
>> +
>> + chip->oneshot_config = o_conf;
>> + chip->continuous_config = c_conf;
>> + return 0;
>> +}
>> +
> There is a lot of moderately controversial stuff in here - I'll reply to
> the binding doc instead of here on these though.
>> +static int ina3221_get_platform_data_dt(struct ina3221_chip_info *chip)
>> +{
>> + struct device *dev = chip->dev;
>> + struct device_node *np = dev->of_node;
>> + struct device_node *np_chan;
>> + struct ina3221_platform_data *pdata;
>> + struct ina3221_channel_data *cdata;
>> + char channel_name[20];
>> + u32 value;
>> + int curr_ua;
>> + int id;
>> + int ret;
>> +
>> + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
>> + if (!pdata)
>> + return -ENOMEM;
>> +
>> + chip->pdata = pdata;
>> +
>> + ret = of_property_read_u32(np, "one-shot-average-sample", &value);
>> + if (!ret)
>> + pdata->oneshot_avg_sample = value;
>> + else
>> + pdata->oneshot_avg_sample = INA3221_CONFIG_AVG_SAMPLE_DEFAULT;
>> +
>> + ret = of_property_read_u32(np, "one-shot-vbus-conv-time-us", &value);
>> + if (!ret)
>> + pdata->oneshot_vbus_conv_time = value;
>> + else
>> + pdata->oneshot_vbus_conv_time =
>> + INA3221_CONFIG_VBUS_CONV_TIME_DEFAULT;
>> +
>> + ret = of_property_read_u32(np, "one-shot-shunt-conv-time-us",
>> + &value);
>> + if (!ret)
>> + pdata->oneshot_shunt_conv_time = value;
>> + else
>> + pdata->oneshot_shunt_conv_time =
>> + INA3221_CONFIG_SHUNT_CONV_TIME_DEFAULT;
>> +
>> + ret = of_property_read_u32(np, "continuous-average-sample", &value);
>> + if (!ret)
>> + pdata->cont_avg_sample = value;
>> + else
>> + pdata->cont_avg_sample = INA3221_CONFIG_AVG_SAMPLE_DEFAULT;
>> +
>> + ret = of_property_read_u32(np, "continuous-vbus-conv-time-us", &value);
>> + if (!ret)
>> + pdata->cont_vbus_conv_time = value;
>> + else
>> + pdata->cont_vbus_conv_time =
>> + INA3221_CONFIG_VBUS_CONV_TIME_DEFAULT;
>> +
>> + ret = of_property_read_u32(np, "continuous-shunt-conv-time-us", &value);
>> + if (!ret)
>> + pdata->cont_shunt_conv_time = value;
>> + else
>> + pdata->cont_shunt_conv_time =
>> + INA3221_CONFIG_SHUNT_CONV_TIME_DEFAULT;
>> +
>> + pdata->enable_power = of_property_read_bool(np,
>> + "enable-power-monitor");
>> + pdata->continuous_mode = of_property_read_bool(np,
>> + "enable-continuous-mode");
>> + pdata->warn_alert = of_property_read_bool(np, "enable-warning-alert");
>> + pdata->crit_alert = of_property_read_bool(np, "enable-critical-alert");
>> +
>> + for (id = 0; id < INA3221_NUMBER_OF_CHANNELS; ++id) {
>> + sprintf(channel_name, "channel%d", id);
>> + np_chan = of_get_child_by_name(np, channel_name);
>> + if (!np_chan)
>> + continue;
>> +
>> + cdata = &pdata->channel_data[id];
>> +
>> + ret = of_property_read_string(np_chan, "label", &cdata->name);
>> + if (ret < 0) {
>> + dev_err(dev, "Channel %s does not have label\n",
>> + np_chan->full_name);
>> + continue;
>> + }
>> +
>> + ret = of_property_read_u32(np_chan,
>> + "warning-current-limit-microamp",
>> + &value);
>> + cdata->warn_limits = (!ret) ? value : ret;
>> +
>> + ret = of_property_read_u32(np_chan,
>> + "critical-current-limit-microamp",
>> + &value);
>> + cdata->crit_limits = (!ret) ? value : ret;
>> +
>> + ret = of_property_read_u32(np_chan, "shunt-resistor-mohm",
>> + &value);
>> + if (!ret)
>> + cdata->shunt_resistance = value;
>> +
>> + pdata->active_channel |= BIT(INA3221_NUMBER_OF_CHANNELS - id -
>> + 1);
>> +
>> + if (cdata->crit_limits < 0) {
>> + ret = ina3221_read_default_channel_critical(chip, id,
>> + &curr_ua);
>> + if (ret < 0)
>> + return ret;
>> + cdata->crit_limits = curr_ua;
>> + } else {
>> + ret = ina3221_set_channel_critical(chip, id,
>> + cdata->crit_limits);
>> + if (ret < 0)
>> + return ret;
>> + }
>> +
>> + if (cdata->warn_limits < 0) {
>> + ret = ina3221_read_default_channel_warning(chip, id,
>> + &curr_ua);
>> + if (ret < 0)
>> + return ret;
>> + cdata->warn_limits = curr_ua;
>> + } else {
>> + ret = ina3221_set_channel_warning(chip, id,
>> + cdata->warn_limits);
>> + if (ret < 0)
>> + return ret;
>> + }
>> + }
>> +
>> + if (!pdata->active_channel)
>> + return -EINVAL;
>> +
>> + ret = ina3221_process_pdata(chip, pdata);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to process platform data: %d\n",
>> + ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_do_reset(struct ina3221_chip_info *chip)
>> +{
>> + int ret;
>> +
>> + ret = regmap_update_bits(chip->rmap, INA3221_CONFIG,
>> + INA3221_CONFIG_RESET_MASK,
>> + INA3221_CONFIG_RESET_EN);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to reset device: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = regmap_update_bits(chip->rmap, INA3221_CONFIG,
>> + INA3221_CONFIG_RESET_MASK, 0);
>> + if (ret < 0) {
>> + dev_err(chip->dev, "Failed to reset device: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ina3221_probe(struct i2c_client *client,
>> + const struct i2c_device_id *id)
>> +{
>> + struct ina3221_chip_info *chip;
>> + struct iio_dev *indio_dev;
>> + int ret;
>> +
>> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
>> + if (!indio_dev)
>> + return -ENOMEM;
>> +
>> + chip = iio_priv(indio_dev);
>> +
>> + chip->rmap = devm_regmap_init_i2c(client, &ina3221_regmap_config);
>> + if (IS_ERR(chip->rmap)) {
>> + ret = PTR_ERR(chip->rmap);
>> + dev_err(&client->dev, "Failed to initialise regmap: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + chip->dev = &client->dev;
>> + mutex_init(&chip->state_lock);
>> + i2c_set_clientdata(client, indio_dev);
>> +
>> + ret = ina3221_do_reset(chip);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = ina3221_get_platform_data_dt(chip);
>> + if (ret < 0) {
>> + dev_err(&client->dev, "Failed to get platform data: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = ina3221_set_operating_mode(chip, chip->pdata->continuous_mode);
>> + if (ret < 0)
>> + return ret;
>> +
>> + indio_dev->modes = INDIO_DIRECT_MODE;
>> + indio_dev->dev.parent = &client->dev;
>> + indio_dev->channels = ina3221_channels_spec;
>> + indio_dev->num_channels = ARRAY_SIZE(ina3221_channels_spec);
>> + indio_dev->name = id->name;
>> + indio_dev->info = &ina3221_info;
>> +
>> + return iio_device_register(indio_dev);
>> +}
>> +
>> +static int ina3221_remove(struct i2c_client *client)
>> +{
>> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
>> + struct ina3221_chip_info *chip = iio_priv(indio_dev);
>> +
>> + iio_device_unregister(indio_dev);
>> +
>> + /* Powerdown */
>> + return regmap_update_bits(chip->rmap, INA3221_CONFIG,
>> + INA3221_CONFIG_MODE_MASK,
>> + INA3221_CONFIG_MODE_POWER_DOWN);
>> +}
>> +
>> +static const struct i2c_device_id ina3221_id[] = {
>> + {.name = "ina3221"},
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(i2c, ina3221_id);
>> +
>> +static struct i2c_driver ina3221_driver = {
>> + .driver = {
>> + .name = "ina3221",
>> + },
>> + .probe = ina3221_probe,
>> + .remove = ina3221_remove,
>> + .id_table = ina3221_id,
>> +};
>> +module_i2c_driver(ina3221_driver);
>> +
>> +MODULE_DESCRIPTION("Texas Instruments INA3221 ADC driver");
>> +MODULE_AUTHOR("Laxman Dewangan <ldewangan@...dia.com>");
>> +MODULE_LICENSE("GPL v2");
>>
>
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