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Message-ID: <SN6PR02MB4093DFF8D832D8ABABCEBF78CA659@SN6PR02MB4093.namprd02.prod.outlook.com>
Date: Mon, 22 Mar 2021 12:11:58 +0000
From: Raviteja Narayanam <rna@...inx.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"jic23@...nel.org" <jic23@...nel.org>
CC: Michal Simek <michals@...inx.com>,
"pmeerw@...erw.net" <pmeerw@...erw.net>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
git <git@...inx.com>, Shubhrajyoti Datta <shubhraj@...inx.com>
Subject: RE: [PATCH 2/2] iio: adc: Add support for TI INA260 power monitors
> -----Original Message-----
> From: Lars-Peter Clausen <lars@...afoo.de>
> Sent: Monday, March 22, 2021 5:22 PM
> To: Raviteja Narayanam <rna@...inx.com>; robh+dt@...nel.org;
> jic23@...nel.org
> Cc: Michal Simek <michals@...inx.com>; pmeerw@...erw.net; linux-
> iio@...r.kernel.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; git <git@...inx.com>; Shubhrajyoti Datta
> <shubhraj@...inx.com>
> Subject: Re: [PATCH 2/2] iio: adc: Add support for TI INA260 power monitors
>
> On 3/22/21 12:43 PM, Lars-Peter Clausen wrote:
> > On 3/22/21 11:50 AM, Raviteja Narayanam wrote:
> >> This driver supports software buffer mode and raw reads of ina260 iio
> >> channels.
> >>
> >> In software buffer mode, a kthread will capture the active
> >> scan_elements periodically using a delay. This can produce a stream
> >> of up to 3 channels plus a 64 bits timestamp based on the scan_elements.
> >>
> >> Signed-off-by: Raviteja Narayanam <raviteja.narayanam@...inx.com>
> >> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
> >
> > Hi,
> >
> > Thanks for that patch, it looks really good.
> >
> > Looking at the datasheet the part seems to be very similar to the
> > ina226 from a software interface point of view. Looks like the current
> > and calibration register are missing and the scales are a bit different.
> >
> > We already have a driver for the ina226 (adc-ina2xx) and it looks like
> > your driver is also inspired by it. Have you considered adding support
> > for the ina260 to the existing driver? This will reduce the amount of
> > duplicated code.
>
> To add to that this driver has some nice new features and bug fixes that are
> not in the ina2xx driver, like debug register access. But the ina2xx has also
> seen a fair amount of improvements since this driver was branched off of it.
> It would be nice to get the best of both in a single driver.
Thanks for the review Lars.
Yes, using ina2xx driver was the first preference but after this discussion (https://www.spinics.net/lists/devicetree/msg354475.html ),
we have started a new driver as ina260 was considered to be sufficiently different from ina2xx.
Regards,
Raviteja N
>
> >
> > - Lars
> >
> >> ---
> >> MAINTAINERS | 8 +
> >> drivers/iio/adc/Kconfig | 12 +
> >> drivers/iio/adc/Makefile | 1 +
> >> drivers/iio/adc/ina260-adc.c | 556
> >> +++++++++++++++++++++++++++++++++++
> >> 4 files changed, 577 insertions(+)
> >> create mode 100644 drivers/iio/adc/ina260-adc.c
> >>
> >> diff --git a/MAINTAINERS b/MAINTAINERS index
> >> aa84121c5611..768a4b148035 100644
> >> --- a/MAINTAINERS
> >> +++ b/MAINTAINERS
> >> @@ -8760,6 +8760,14 @@ F: Documentation/hwmon/ina2xx.rst
> >> F: drivers/hwmon/ina2xx.c
> >> F: include/linux/platform_data/ina2xx.h
> >> +INA260 POWER MONITOR DRIVER
> >> +M: Raviteja Narayanam <raviteja.narayanam@...inx.com>
> >> +R: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
> >> +R: Michal Simek <michal.simek@...inx.com>
> >> +S: Maintained
> >> +F: Documentation/devicetree/bindings/iio/adc/ti,ina260.yaml
> >> +F: drivers/iio/adc/ina260-adc.c
> >> +
> >> INDUSTRY PACK SUBSYSTEM (IPACK)
> >> M: Samuel Iglesias Gonsalvez <siglesias@...lia.com>
> >> M: Jens Taprogge <jens.taprogge@...rogge.org> diff --git
> >> a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index
> >> bf7d22fa4be2..f6f8fd6bd113 100644
> >> --- a/drivers/iio/adc/Kconfig
> >> +++ b/drivers/iio/adc/Kconfig
> >> @@ -497,6 +497,18 @@ 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 INA260_ADC
> >> + tristate "Texas Instruments INA260 Power Monitors IIO driver"
> >> + depends on I2C
> >> + select REGMAP_I2C
> >> + select IIO_BUFFER
> >> + select IIO_KFIFO_BUF
> >> + help
> >> + Say yes here to build support for TI INA260 power monitor.
> >> + This driver can also be built as a module. It supports
> >> software buffer
> >> + mode and raw reads of ina260 iio channels. Up to 4 channels
> >> +are
> >> + supported including timestamp.
> >> +
> >> config INGENIC_ADC
> >> tristate "Ingenic JZ47xx SoCs ADC driver"
> >> depends on MIPS || COMPILE_TEST diff --git
> >> a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index
> >> 5fca90ada0ec..a3bbcad64a41 100644
> >> --- a/drivers/iio/adc/Makefile
> >> +++ b/drivers/iio/adc/Makefile
> >> @@ -47,6 +47,7 @@ obj-$(CONFIG_HI8435) += hi8435.o
> >> obj-$(CONFIG_HX711) += hx711.o
> >> obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
> >> obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
> >> +obj-$(CONFIG_INA260_ADC) += ina260-adc.o
> >> obj-$(CONFIG_INGENIC_ADC) += ingenic-adc.o
> >> obj-$(CONFIG_INTEL_MRFLD_ADC) += intel_mrfld_adc.o
> >> obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o diff --git
> >> a/drivers/iio/adc/ina260-adc.c b/drivers/iio/adc/ina260-adc.c new
> >> file mode 100644 index 000000000000..7f74aa94fd31
> >> --- /dev/null
> >> +++ b/drivers/iio/adc/ina260-adc.c
> >> @@ -0,0 +1,556 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +/*
> >> + * INA260 power monitor driver
> >> + * Based on drivers/iio/adc/ina2xx-adc.c
> >> + *
> >> + * Copyright (C) 2021 Xilinx, Inc.
> >> + */
> >> +
> >> +#include <linux/i2c.h>
> >> +#include <linux/iio/iio.h>
> >> +#include <linux/iio/buffer.h>
> >> +#include <linux/iio/kfifo_buf.h>
> >> +#include <linux/iio/sysfs.h>
> >> +#include <linux/kthread.h>
> >> +#include <linux/module.h>
> >> +#include <linux/of_device.h>
> >> +#include <linux/regmap.h>
> >> +#include <linux/sched/task.h>
> >> +#include <linux/util_macros.h>
> >> +
> >> +/* INA260 registers definition */
> >> +#define INA260_CONFIG 0x00
> >> +#define INA260_CURRENT 0x01
> >> +#define INA260_VOLTAGE 0x02
> >> +#define INA260_POWER 0x03
> >> +#define INA260_MASK_ENABLE 0x06
> >> +#define INA260_ALERT_LIMIT 0x07
> >> +#define INA260_MANF_ID 0xFE
> >> +#define INA260_DIE_ID 0xFF
> >> +
> >> +#define INA260_CONFIG_DEFAULT 0x6327
> >> +
> >> +#define INA260_CURRENT_LSB 1250
> >> +#define INA260_VOLTAGE_LSB 1250
> >> +#define INA260_POWER_LSB 10
> >> +
> >> +/* Bits */
> >> +#define INA260_CVRF BIT(3)
> >> +
> >> +#define INA260_MODE_MASK GENMASK(2, 0) #define
> INA260_VOLT_MASK
> >> +GENMASK(8, 6) #define INA260_SHIFT_VOLT(val) ((val) << 6) #define
> >> +INA260_CURR_MASK GENMASK(5, 3) #define
> INA260_SHIFT_CURR(val)
> >> +((val) << 3) #define INA260_AVG_MASK GENMASK(11, 9) #define
> >> +INA260_SHIFT_AVG(val) ((val) << 9)
> >> +
> >> +#define SAMPLING_PERIOD(x) ({ \
> >> + typeof(x) _x = (x); \
> >> + (_x->config->volt_conv_time \
> >> + + _x->config->curr_conv_time) \
> >> + * _x->config->avgs; })
> >> +
> >> +static bool ina260_is_writeable_reg(struct device *dev, unsigned int
> >> reg)
> >> +{
> >> + return (reg == INA260_CONFIG) || (reg == INA260_MASK_ENABLE) ||
> >> + (reg == INA260_ALERT_LIMIT); }
> >> +
> >> +static bool ina260_is_volatile_reg(struct device *dev, unsigned int
> >> reg)
> >> +{
> >> + return (reg != INA260_CONFIG);
> >> +}
> >> +
> >> +static inline bool is_signed_reg(unsigned int reg) {
> >> + return (reg == INA260_CURRENT);
> >> +}
> >> +
> >> +static const struct regmap_config ina260_regmap_config = {
> >> + .reg_bits = 8,
> >> + .val_bits = 16,
> >> + .max_register = 8,
> >> + .writeable_reg = ina260_is_writeable_reg,
> >> + .volatile_reg = ina260_is_volatile_reg, };
> >> +
> >> +enum ina260_ids {ina260 = 0};
> >> +
> >> +/**
> >> + * struct ina260_config - For configurable parameters
> >> + * @config_default: Default configuration
> >> + * @volt_conv_time: Bus voltage conversion time
> >> + * @curr_conv_time: Shunt current conversion time
> >> + * @avgs: Number of samples collected and averaged */ struct
> >> +ina260_config {
> >> + u16 config_default;
> >> + int volt_conv_time;
> >> + int curr_conv_time;
> >> + int avgs;
> >> +};
> >> +
> >> +/**
> >> + * struct ina260_chip - For device specific data
> >> + * @regmap: Regmap pointer to device registers
> >> + * @task: Pointer to task created by buffer mode
> >> + * @lock: Mutex to enable use of multiple user apps
> >> + * @chip_id: Id to determine chip
> >> + * @config: Pointer to config structure */ struct ina260_chip {
> >> + struct regmap *regmap;
> >> + struct task_struct *task;
> >> + struct mutex lock; /* Lock for device writes */
> >> + enum ina260_ids chip_id;
> >> + struct ina260_config *config;
> >> +};
> >> +
> >> +static struct ina260_config ina260_config[] = {
> >> + [ina260] = {
> >> + .config_default = INA260_CONFIG_DEFAULT,
> >> + .volt_conv_time = 1100,
> >> + .curr_conv_time = 1100,
> >> + .avgs = 4,
> >> + },
> >> +};
> >> +
> >> +static int ina260_read_raw(struct iio_dev *indio_dev,
> >> + struct iio_chan_spec const *chan,
> >> + int *val, int *val2, long mask) {
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> + unsigned int regval;
> >> + int ret;
> >> +
> >> + switch (mask) {
> >> + case IIO_CHAN_INFO_RAW:
> >> + if (iio_buffer_enabled(indio_dev))
> >> + return -EBUSY;
> >> +
> >> + ret = regmap_read(chip->regmap, chan->address, ®val);
> >> + if (ret)
> >> + return ret;
> >> +
> >> + if (is_signed_reg(chan->address))
> >> + *val = (s16)regval;
> >> + else
> >> + *val = regval;
> >> + return IIO_VAL_INT;
> >> +
> >> + case IIO_CHAN_INFO_SCALE:
> >> + switch (chan->address) {
> >> + case INA260_CURRENT:
> >> + *val = INA260_CURRENT_LSB;
> >> + *val2 = 1000;
> >> + return IIO_VAL_FRACTIONAL;
> >> +
> >> + case INA260_VOLTAGE:
> >> + *val = INA260_VOLTAGE_LSB;
> >> + *val2 = 1000;
> >> + return IIO_VAL_FRACTIONAL;
> >> +
> >> + case INA260_POWER:
> >> + *val = INA260_POWER_LSB;
> >> + return IIO_VAL_INT;
> >> + }
> >> + return -EINVAL;
> >> +
> >> + case IIO_CHAN_INFO_INT_TIME:
> >> + *val = 0;
> >> + if (chan->address == INA260_VOLTAGE)
> >> + *val2 = chip->config->volt_conv_time;
> >> + else
> >> + *val2 = chip->config->curr_conv_time;
> >> +
> >> + return IIO_VAL_INT_PLUS_MICRO;
> >> +
> >> + case IIO_CHAN_INFO_SAMP_FREQ:
> >> + *val = DIV_ROUND_CLOSEST(1000000, SAMPLING_PERIOD(chip));
> >> + return IIO_VAL_INT;
> >> +
> >> + case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> >> + *val = chip->config->avgs;
> >> + return IIO_VAL_INT;
> >> + }
> >> +
> >> + return -EINVAL;
> >> +}
> >> +
> >> +static const int ina260_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512,
> >> 1024 };
> >> +
> >> +/* Conversion times in uS */
> >> +static const int ina260_conv_time_tab[] = { 140, 204, 332, 588,
> >> 1100, 2116, 4156, 8244 };
> >> +
> >> +static int ina260_write_raw(struct iio_dev *indio_dev,
> >> + struct iio_chan_spec const *chan,
> >> + int val, int val2, long mask) {
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> + unsigned int config;
> >> + int ret, bits;
> >> +
> >> + if (iio_buffer_enabled(indio_dev))
> >> + return -EBUSY;
> >> +
> >> + mutex_lock(&chip->lock);
> >> +
> >> + ret = regmap_read(chip->regmap, INA260_CONFIG, &config);
> >> + if (ret)
> >> + goto err;
> >> +
> >> + switch (mask) {
> >> + case IIO_CHAN_INFO_INT_TIME:
> >> + if (val2 > 8244 || val2 < 140) {
> >> + ret = -EINVAL;
> >> + goto err;
> >> + }
> >> +
> >> + bits = find_closest(val2, ina260_conv_time_tab,
> >> + ARRAY_SIZE(ina260_conv_time_tab));
> >> +
> >> + if (chan->address == INA260_VOLTAGE) {
> >> + chip->config->volt_conv_time =
> >> +ina260_conv_time_tab[bits];
> >> + config &= ~INA260_VOLT_MASK;
> >> + config |= INA260_SHIFT_VOLT(bits) & INA260_VOLT_MASK;
> >> + } else {
> >> + chip->config->curr_conv_time =
> >> +ina260_conv_time_tab[bits];
> >> + config &= ~INA260_CURR_MASK;
> >> + config |= INA260_SHIFT_CURR(bits) & INA260_CURR_MASK;
> >> + }
> >> + break;
> >> +
> >> + case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> >> + bits = find_closest(val, ina260_avg_tab,
> >> ARRAY_SIZE(ina260_avg_tab));
> >> + chip->config->avgs = ina260_avg_tab[bits];
> >> + config &= ~INA260_AVG_MASK;
> >> + config |= INA260_SHIFT_AVG(bits) & INA260_AVG_MASK;
> >> + break;
> >> +
> >> + default:
> >> + ret = -EINVAL;
> >> + }
> >> + if (!ret)
> >> + ret = regmap_write(chip->regmap, INA260_CONFIG, config);
> >> +err:
> >> + mutex_unlock(&chip->lock);
> >> +
> >> + return ret;
> >> +}
> >> +
> >> +static int ina260_debug_reg(struct iio_dev *indio_dev,
> >> + unsigned int reg, unsigned int writeval, unsigned
> >> int *readval)
> >> +{
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> +
> >> + if (!readval)
> >> + return regmap_write(chip->regmap, reg, writeval);
> >> +
> >> + return regmap_read(chip->regmap, reg, readval); }
> >> +
> >> +#define INA260_CHAN_VOLTAGE(_index, _address) { \
> >> + .type = IIO_VOLTAGE, \
> >> + .address = (_address), \
> >> + .indexed = 1, \
> >> + .channel = (_index), \
> >> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> >> + BIT(IIO_CHAN_INFO_SCALE) | \
> >> + BIT(IIO_CHAN_INFO_INT_TIME), \
> >> + .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
> >> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
> >> + .scan_index = (_index), \
> >> + .scan_type = { \
> >> + .sign = 'u', \
> >> + .realbits = 16, \
> >> + .storagebits = 16, \
> >> + .endianness = IIO_CPU, \
> >> + } \
> >> +}
> >> +
> >> +#define INA260_CHAN_CURRENT(_index, _address) { \
> >> + .type = IIO_CURRENT, \
> >> + .address = (_address), \
> >> + .indexed = 1, \
> >> + .channel = (_index), \
> >> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> >> + BIT(IIO_CHAN_INFO_SCALE) | \
> >> + BIT(IIO_CHAN_INFO_INT_TIME), \
> >> + .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
> >> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
> >> + .scan_index = (_index), \
> >> + .scan_type = { \
> >> + .sign = 's', \
> >> + .realbits = 16, \
> >> + .storagebits = 16, \
> >> + .endianness = IIO_CPU, \
> >> + } \
> >> +}
> >> +
> >> +#define INA260_CHAN_POWER(_index, _address) { \
> >> + .type = IIO_POWER, \
> >> + .address = (_address), \
> >> + .indexed = 1, \
> >> + .channel = (_index), \
> >> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> >> + BIT(IIO_CHAN_INFO_SCALE), \
> >> + .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
> >> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
> >> + .scan_index = (_index), \
> >> + .scan_type = { \
> >> + .sign = 'u', \
> >> + .realbits = 16, \
> >> + .storagebits = 16, \
> >> + .endianness = IIO_CPU, \
> >> + } \
> >> +}
> >> +
> >> +static const struct iio_chan_spec ina260_channels[] = {
> >> + INA260_CHAN_CURRENT(0, INA260_CURRENT),
> >> + INA260_CHAN_VOLTAGE(1, INA260_VOLTAGE),
> >> + INA260_CHAN_POWER(2, INA260_POWER),
> >> + IIO_CHAN_SOFT_TIMESTAMP(3),
> >> +};
> >> +
> >> +/* Possible integration times for current and voltage */ static
> >> +IIO_CONST_ATTR_NAMED(ina260_integration_time_available,
> >> + integration_time_available,
> >> + "0.000140 0.000204 0.000332 0.000588 0.001100
> >> 0.002116 0.004156 0.008244");
> >> +
> >> +static struct attribute *ina260_attributes[] = {
> >> +&iio_const_attr_ina260_integration_time_available.dev_attr.attr,
> >> + NULL,
> >> +};
> >> +
> >> +static const struct attribute_group ina260_attribute_group = {
> >> + .attrs = ina260_attributes,
> >> +};
> >> +
> >> +static const struct iio_info ina260_info = {
> >> + .attrs = &ina260_attribute_group,
> >> + .read_raw = ina260_read_raw,
> >> + .write_raw = ina260_write_raw,
> >> + .debugfs_reg_access = ina260_debug_reg, };
> >> +
> >> +static int ina260_conversion_ready(struct iio_dev *indio_dev) {
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> + unsigned int alert;
> >> + int ret;
> >> +
> >> + ret = regmap_read(chip->regmap, INA260_MASK_ENABLE, &alert);
> >> + if (ret < 0)
> >> + return ret;
> >> +
> >> + return (alert & INA260_CVRF);
> >> +}
> >> +
> >> +static int ina260_work_buffer(struct iio_dev *indio_dev) {
> >> + /* data buffer needs space for channel data and timestap */
> >> + unsigned short data[3 + sizeof(s64) / sizeof(short)];
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> + int bit, ret, i = 0;
> >> + s64 time;
> >> +
> >> + time = iio_get_time_ns(indio_dev);
> >> +
> >> + /*
> >> + * Read current, voltage and power from device
> >> + */
> >> + for_each_set_bit(bit, indio_dev->active_scan_mask,
> >> + indio_dev->masklength) {
> >> + unsigned int val;
> >> +
> >> + ret = regmap_read(chip->regmap, INA260_CURRENT + bit, &val);
> >> + if (ret < 0)
> >> + return ret;
> >> +
> >> + data[i++] = val;
> >> + }
> >> +
> >> + iio_push_to_buffers_with_timestamp(indio_dev, data, time);
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static int ina260_capture_thread(void *data) {
> >> + struct iio_dev *indio_dev = data;
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> + int sampling_us = SAMPLING_PERIOD(chip);
> >> + struct timespec64 next, now, delta;
> >> + s64 delay_us;
> >> + int ret;
> >> +
> >> + ktime_get_ts64(&next);
> >> +
> >> + do {
> >> + while (1) {
> >> + /* Check if conversion is ready */
> >> + ret = ina260_conversion_ready(indio_dev);
> >> + if (ret < 0)
> >> + return ret;
> >> +
> >> + /*
> >> + * If the conversion was not yet finished,
> >> + * reset the reference timestamp.
> >> + */
> >> + if (ret == 0)
> >> + ktime_get_ts64(&next);
> >> + else
> >> + break;
> >> + }
> >> + /* Read the data from sensor and push it to buffers */
> >> + ret = ina260_work_buffer(indio_dev);
> >> + if (ret < 0)
> >> + return ret;
> >> +
> >> + ktime_get_ts64(&now);
> >> + /*
> >> + * Advance the timestamp for the next poll by one sampling
> >> + * interval, and sleep for the remainder (next - now)
> >> + * In case "next" has already passed, the interval is added
> >> + * multiple times, i.e. samples are dropped.
> >> + */
> >> + do {
> >> + timespec64_add_ns(&next, 1000 * sampling_us);
> >> + delta = timespec64_sub(next, now);
> >> + delay_us = div_s64(timespec64_to_ns(&delta), 1000);
> >> + } while (delay_us <= 0);
> >> +
> >> + usleep_range(delay_us, (delay_us * 3) >> 1);
> >> +
> >> + } while (!kthread_should_stop());
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static int ina260_buffer_enable(struct iio_dev *indio_dev) {
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> + unsigned int sampling_us = SAMPLING_PERIOD(chip);
> >> + struct task_struct *task;
> >> +
> >> + task = kthread_create(ina260_capture_thread, (void *)indio_dev,
> >> + "%s:%d-%uus", indio_dev->name, indio_dev->id,
> >> + sampling_us);
> >> +
> >> + if (IS_ERR(task))
> >> + return PTR_ERR(task);
> >> +
> >> + get_task_struct(task);
> >> + wake_up_process(task);
> >> + chip->task = task;
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static int ina260_buffer_disable(struct iio_dev *indio_dev) {
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> +
> >> + if (chip->task) {
> >> + kthread_stop(chip->task);
> >> + put_task_struct(chip->task);
> >> + chip->task = NULL;
> >> + }
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static const struct iio_buffer_setup_ops ina260_setup_ops = {
> >> + .postenable = &ina260_buffer_enable,
> >> + .predisable = &ina260_buffer_disable, };
> >> +
> >> +static int ina260_probe(struct i2c_client *client, const struct
> >> i2c_device_id *id)
> >> +{
> >> + struct iio_dev *indio_dev;
> >> + struct iio_buffer *buffer;
> >> + struct ina260_chip *chip;
> >> + enum ina260_ids type = 0;
> >> + int ret;
> >> +
> >> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
> >> + if (!indio_dev)
> >> + return -ENOMEM;
> >> +
> >> + chip = iio_priv(indio_dev);
> >> + i2c_set_clientdata(client, indio_dev);
> >> +
> >> + chip->regmap = devm_regmap_init_i2c(client,
> >> +&ina260_regmap_config);
> >> + if (IS_ERR(chip->regmap)) {
> >> + dev_err(&client->dev, "failed to allocate register map\n");
> >> + return PTR_ERR(chip->regmap);
> >> + }
> >> +
> >> + mutex_init(&chip->lock);
> >> +
> >> + indio_dev->modes = INDIO_DIRECT_MODE |
> INDIO_BUFFER_SOFTWARE;
> >> + indio_dev->dev.parent = &client->dev;
> >> + indio_dev->dev.of_node = client->dev.of_node;
> >> +
> >> + chip->config = &ina260_config[type];
> >> + ret = regmap_write(chip->regmap, INA260_CONFIG,
> >> + chip->config->config_default);
> >> + if (ret) {
> >> + dev_err(&client->dev, "Error configuring the device\n");
> >> + return ret;
> >> + }
> >> + indio_dev->channels = ina260_channels;
> >> + indio_dev->num_channels = ARRAY_SIZE(ina260_channels);
> >> + indio_dev->info = &ina260_info;
> >> + indio_dev->name = id->name;
> >> + indio_dev->setup_ops = &ina260_setup_ops;
> >> +
> >> + buffer = devm_iio_kfifo_allocate(&indio_dev->dev);
> >> + if (!buffer)
> >> + return -ENOMEM;
> >> +
> >> + iio_device_attach_buffer(indio_dev, buffer);
> >> +
> >> + return iio_device_register(indio_dev); }
> >> +
> >> +static int ina260_remove(struct i2c_client *client) {
> >> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> >> + struct ina260_chip *chip = iio_priv(indio_dev);
> >> +
> >> + iio_device_unregister(indio_dev);
> >> + /* Power down */
> >> + return regmap_update_bits(chip->regmap, INA260_CONFIG,
> >> INA260_MODE_MASK, 0);
> >> +}
> >> +
> >> +static const struct i2c_device_id ina260_id[] = {
> >> + {"ina260", ina260},
> >> + {}
> >> +};
> >> +MODULE_DEVICE_TABLE(i2c, ina260_id);
> >> +
> >> +static const struct of_device_id ina260_of_match[] = {
> >> + {
> >> + .compatible = "ti,ina260",
> >> + .data = (void *)ina260
> >> + },
> >> + {},
> >> +};
> >> +MODULE_DEVICE_TABLE(of, ina260_of_match);
> >> +
> >> +static struct i2c_driver ina260_driver = {
> >> + .driver = {
> >> + .name = "ina260-adc",
> >> + .of_match_table = ina260_of_match,
> >> + },
> >> + .probe = ina260_probe,
> >> + .remove = ina260_remove,
> >> + .id_table = ina260_id,
> >> +};
> >> +module_i2c_driver(ina260_driver);
> >> +
> >> +MODULE_AUTHOR("Raviteja Narayanam
> <raviteja.narayanam@...inx.com>");
> >> +MODULE_DESCRIPTION("Texas Instruments INA 260 ADC driver");
> >> +MODULE_LICENSE("GPL v2");
> >
> >
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