/* * INA2XX Current and Power Monitors * * Copyright 2015 Baylibre SAS. * * 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. * * Based on linux/drivers/iio/adc/ad7291.c * Copyright 2010-2011 Analog Devices Inc. * * Based on linux/drivers/hwmon/ina2xx.c * Copyright 2012 Lothar Felten * * Licensed under the GPL-2 or later. * * IIO driver for INA219-220-226-230-231 * * Configurable 7-bit I2C slave address from 0x40 to 0x4F */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* INA2XX registers definition */ #define INA2XX_CONFIG 0x00 #define INA2XX_SHUNT_VOLTAGE 0x01 /* readonly */ #define INA2XX_BUS_VOLTAGE 0x02 /* readonly */ #define INA2XX_POWER 0x03 /* readonly */ #define INA2XX_CURRENT 0x04 /* readonly */ #define INA2XX_CALIBRATION 0x05 #define INA226_MASK_ENABLE 0x06 #define INA226_CVRF BIT(3) #define INA2XX_MAX_REGISTERS 8 /* settings - depend on use case */ #define INA219_CONFIG_DEFAULT 0x399F /* PGA=1/8, BRNG=32V */ #define INA219_DEFAULT_IT 532 #define INA219_DEFAULT_BRNG 1 /* 32V */ #define INA219_DEFAULT_PGA 125 /* 1000/8 */ #define INA226_CONFIG_DEFAULT 0x4327 #define INA226_DEFAULT_AVG 4 #define INA226_DEFAULT_IT 1110 #define INA2XX_RSHUNT_DEFAULT 10000 /* * bit masks for reading the settings in the configuration register * FIXME: use regmap_fields. */ #define INA2XX_MODE_MASK GENMASK(3, 0) /* Gain for VShunt: 1/8 (default), 1/4, 1/2, 1 */ #define INA219_PGA_MASK GENMASK(12, 11) #define INA219_SHIFT_PGA(val) ((val) << 11) /* VBus range: 32V (default), 16V */ #define INA219_BRNG_MASK BIT(13) #define INA219_SHIFT_BRNG(val) ((val) << 13) /* Averaging for VBus/VShunt/Power */ #define INA226_AVG_MASK GENMASK(11, 9) #define INA226_SHIFT_AVG(val) ((val) << 9) /* Integration time for VBus */ #define INA219_ITB_MASK GENMASK(10, 7) #define INA219_SHIFT_ITB(val) ((val) << 7) #define INA226_ITB_MASK GENMASK(8, 6) #define INA226_SHIFT_ITB(val) ((val) << 6) /* Integration time for VShunt */ #define INA219_ITS_MASK GENMASK(6, 3) #define INA219_SHIFT_ITS(val) ((val) << 3) #define INA226_ITS_MASK GENMASK(5, 3) #define INA226_SHIFT_ITS(val) ((val) << 3) /* INA219 Bus voltage register, low bits are flags */ #define INA219_OVF BIT(0) #define INA219_CNVR BIT(1) #define INA219_BUS_VOLTAGE_SHIFT 3 /* Cosmetic macro giving the sampling period for a full P=UxI cycle */ #define SAMPLING_PERIOD(c) ((c->int_time_vbus + c->int_time_vshunt) \ * c->avg) static bool ina2xx_is_writeable_reg(struct device *dev, unsigned int reg) { return (reg == INA2XX_CONFIG) || (reg > INA2XX_CURRENT); } static bool ina2xx_is_volatile_reg(struct device *dev, unsigned int reg) { return (reg != INA2XX_CONFIG); } static inline bool is_signed_reg(unsigned int reg) { return (reg == INA2XX_SHUNT_VOLTAGE) || (reg == INA2XX_CURRENT); } static const struct regmap_config ina2xx_regmap_config = { .reg_bits = 8, .val_bits = 16, .max_register = INA2XX_MAX_REGISTERS, .writeable_reg = ina2xx_is_writeable_reg, .volatile_reg = ina2xx_is_volatile_reg, }; enum ina2xx_ids { ina219, ina226 }; struct ina2xx_config { u16 config_default; int calibration_value; int shunt_voltage_lsb; /* nV */ int bus_voltage_shift; /* position of lsb */ int bus_voltage_lsb; /* uV */ /* fixed relation between current and power lsb, uW/uA */ int power_lsb_factor; enum ina2xx_ids chip_id; }; struct ina2xx_chip_info { struct regmap *regmap; struct task_struct *task; const struct ina2xx_config *config; struct mutex state_lock; unsigned int shunt_resistor_uohm; int avg; int int_time_vbus; /* Bus voltage integration time uS */ int int_time_vshunt; /* Shunt voltage integration time uS */ int range_vbus; /* Bus voltage maximum in V */ int pga_gain_vshunt; /* Shunt voltage PGA gain */ bool allow_async_readout; /* data buffer needs space for channel data and timestamp */ struct { u16 chan[4]; u64 ts __aligned(8); } scan; }; static const struct ina2xx_config ina2xx_config[] = { [ina219] = { .config_default = INA219_CONFIG_DEFAULT, .calibration_value = 4096, .shunt_voltage_lsb = 10000, .bus_voltage_shift = INA219_BUS_VOLTAGE_SHIFT, .bus_voltage_lsb = 4000, .power_lsb_factor = 20, .chip_id = ina219, }, [ina226] = { .config_default = INA226_CONFIG_DEFAULT, .calibration_value = 2048, .shunt_voltage_lsb = 2500, .bus_voltage_shift = 0, .bus_voltage_lsb = 1250, .power_lsb_factor = 25, .chip_id = ina226, }, }; static int ina2xx_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { int ret; struct ina2xx_chip_info *chip = iio_priv(indio_dev); unsigned int regval; switch (mask) { case IIO_CHAN_INFO_RAW: ret = regmap_read(chip->regmap, chan->address, ®val); if (ret) return ret; if (is_signed_reg(chan->address)) *val = (s16) regval; else *val = regval; if (chan->address == INA2XX_BUS_VOLTAGE) *val >>= chip->config->bus_voltage_shift; return IIO_VAL_INT; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *val = chip->avg; return IIO_VAL_INT; case IIO_CHAN_INFO_INT_TIME: *val = 0; if (chan->address == INA2XX_SHUNT_VOLTAGE) *val2 = chip->int_time_vshunt; else *val2 = chip->int_time_vbus; return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_SAMP_FREQ: /* * Sample freq is read only, it is a consequence of * 1/AVG*(CT_bus+CT_shunt). */ *val = DIV_ROUND_CLOSEST(1000000, SAMPLING_PERIOD(chip)); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: switch (chan->address) { case INA2XX_SHUNT_VOLTAGE: /* processed (mV) = raw * lsb(nV) / 1000000 */ *val = chip->config->shunt_voltage_lsb; *val2 = 1000000; return IIO_VAL_FRACTIONAL; case INA2XX_BUS_VOLTAGE: /* processed (mV) = raw * lsb (uV) / 1000 */ *val = chip->config->bus_voltage_lsb; *val2 = 1000; return IIO_VAL_FRACTIONAL; case INA2XX_CURRENT: /* * processed (mA) = raw * current_lsb (mA) * current_lsb (mA) = shunt_voltage_lsb (nV) / * shunt_resistor (uOhm) */ *val = chip->config->shunt_voltage_lsb; *val2 = chip->shunt_resistor_uohm; return IIO_VAL_FRACTIONAL; case INA2XX_POWER: /* * processed (mW) = raw * power_lsb (mW) * power_lsb (mW) = power_lsb_factor (mW/mA) * * current_lsb (mA) */ *val = chip->config->power_lsb_factor * chip->config->shunt_voltage_lsb; *val2 = chip->shunt_resistor_uohm; return IIO_VAL_FRACTIONAL; } return -EINVAL; case IIO_CHAN_INFO_HARDWAREGAIN: switch (chan->address) { case INA2XX_SHUNT_VOLTAGE: *val = chip->pga_gain_vshunt; *val2 = 1000; return IIO_VAL_FRACTIONAL; case INA2XX_BUS_VOLTAGE: *val = chip->range_vbus == 32 ? 1 : 2; return IIO_VAL_INT; } return -EINVAL; } return -EINVAL; } /* * Available averaging rates for ina226. The indices correspond with * the bit values expected by the chip (according to the ina226 datasheet, * table 3 AVG bit settings, found at * https://www.ti.com/lit/ds/symlink/ina226.pdf. */ static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 }; static int ina226_set_average(struct ina2xx_chip_info *chip, unsigned int val, unsigned int *config) { int bits; if (val > 1024 || val < 1) return -EINVAL; bits = find_closest(val, ina226_avg_tab, ARRAY_SIZE(ina226_avg_tab)); chip->avg = ina226_avg_tab[bits]; *config &= ~INA226_AVG_MASK; *config |= INA226_SHIFT_AVG(bits) & INA226_AVG_MASK; return 0; } /* Conversion times in uS */ static const int ina226_conv_time_tab[] = { 140, 204, 332, 588, 1100, 2116, 4156, 8244 }; static int ina226_set_int_time_vbus(struct ina2xx_chip_info *chip, unsigned int val_us, unsigned int *config) { int bits; if (val_us > 8244 || val_us < 140) return -EINVAL; bits = find_closest(val_us, ina226_conv_time_tab, ARRAY_SIZE(ina226_conv_time_tab)); chip->int_time_vbus = ina226_conv_time_tab[bits]; *config &= ~INA226_ITB_MASK; *config |= INA226_SHIFT_ITB(bits) & INA226_ITB_MASK; return 0; } static int ina226_set_int_time_vshunt(struct ina2xx_chip_info *chip, unsigned int val_us, unsigned int *config) { int bits; if (val_us > 8244 || val_us < 140) return -EINVAL; bits = find_closest(val_us, ina226_conv_time_tab, ARRAY_SIZE(ina226_conv_time_tab)); chip->int_time_vshunt = ina226_conv_time_tab[bits]; *config &= ~INA226_ITS_MASK; *config |= INA226_SHIFT_ITS(bits) & INA226_ITS_MASK; return 0; } /* Conversion times in uS. */ static const int ina219_conv_time_tab_subsample[] = { 84, 148, 276, 532 }; static const int ina219_conv_time_tab_average[] = { 532, 1060, 2130, 4260, 8510, 17020, 34050, 68100}; static int ina219_lookup_int_time(unsigned int *val_us, int *bits) { if (*val_us > 68100 || *val_us < 84) return -EINVAL; if (*val_us <= 532) { *bits = find_closest(*val_us, ina219_conv_time_tab_subsample, ARRAY_SIZE(ina219_conv_time_tab_subsample)); *val_us = ina219_conv_time_tab_subsample[*bits]; } else { *bits = find_closest(*val_us, ina219_conv_time_tab_average, ARRAY_SIZE(ina219_conv_time_tab_average)); *val_us = ina219_conv_time_tab_average[*bits]; *bits |= 0x8; } return 0; } static int ina219_set_int_time_vbus(struct ina2xx_chip_info *chip, unsigned int val_us, unsigned int *config) { int bits, ret; unsigned int val_us_best = val_us; ret = ina219_lookup_int_time(&val_us_best, &bits); if (ret) return ret; chip->int_time_vbus = val_us_best; *config &= ~INA219_ITB_MASK; *config |= INA219_SHIFT_ITB(bits) & INA219_ITB_MASK; return 0; } static int ina219_set_int_time_vshunt(struct ina2xx_chip_info *chip, unsigned int val_us, unsigned int *config) { int bits, ret; unsigned int val_us_best = val_us; ret = ina219_lookup_int_time(&val_us_best, &bits); if (ret) return ret; chip->int_time_vshunt = val_us_best; *config &= ~INA219_ITS_MASK; *config |= INA219_SHIFT_ITS(bits) & INA219_ITS_MASK; return 0; } static const int ina219_vbus_range_tab[] = { 1, 2 }; static int ina219_set_vbus_range_denom(struct ina2xx_chip_info *chip, unsigned int range, unsigned int *config) { if (range == 1) chip->range_vbus = 32; else if (range == 2) chip->range_vbus = 16; else return -EINVAL; *config &= ~INA219_BRNG_MASK; *config |= INA219_SHIFT_BRNG(range == 1 ? 1 : 0) & INA219_BRNG_MASK; return 0; } static const int ina219_vshunt_gain_tab[] = { 125, 250, 500, 1000 }; static const int ina219_vshunt_gain_frac[] = { 125, 1000, 250, 1000, 500, 1000, 1000, 1000 }; static int ina219_set_vshunt_pga_gain(struct ina2xx_chip_info *chip, unsigned int gain, unsigned int *config) { int bits; if (gain < 125 || gain > 1000) return -EINVAL; bits = find_closest(gain, ina219_vshunt_gain_tab, ARRAY_SIZE(ina219_vshunt_gain_tab)); chip->pga_gain_vshunt = ina219_vshunt_gain_tab[bits]; bits = 3 - bits; *config &= ~INA219_PGA_MASK; *config |= INA219_SHIFT_PGA(bits) & INA219_PGA_MASK; return 0; } static int ina2xx_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { switch (mask) { case IIO_CHAN_INFO_HARDWAREGAIN: switch (chan->address) { case INA2XX_SHUNT_VOLTAGE: *type = IIO_VAL_FRACTIONAL; *length = sizeof(ina219_vshunt_gain_frac) / sizeof(int); *vals = ina219_vshunt_gain_frac; return IIO_AVAIL_LIST; case INA2XX_BUS_VOLTAGE: *type = IIO_VAL_INT; *length = sizeof(ina219_vbus_range_tab) / sizeof(int); *vals = ina219_vbus_range_tab; return IIO_AVAIL_LIST; } } return -EINVAL; } static int ina2xx_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct ina2xx_chip_info *chip = iio_priv(indio_dev); unsigned int config, tmp; int ret; if (iio_buffer_enabled(indio_dev)) return -EBUSY; mutex_lock(&chip->state_lock); ret = regmap_read(chip->regmap, INA2XX_CONFIG, &config); if (ret) goto err; tmp = config; switch (mask) { case IIO_CHAN_INFO_OVERSAMPLING_RATIO: ret = ina226_set_average(chip, val, &tmp); break; case IIO_CHAN_INFO_INT_TIME: if (chip->config->chip_id == ina226) { if (chan->address == INA2XX_SHUNT_VOLTAGE) ret = ina226_set_int_time_vshunt(chip, val2, &tmp); else ret = ina226_set_int_time_vbus(chip, val2, &tmp); } else { if (chan->address == INA2XX_SHUNT_VOLTAGE) ret = ina219_set_int_time_vshunt(chip, val2, &tmp); else ret = ina219_set_int_time_vbus(chip, val2, &tmp); } break; case IIO_CHAN_INFO_HARDWAREGAIN: if (chan->address == INA2XX_SHUNT_VOLTAGE) ret = ina219_set_vshunt_pga_gain(chip, val * 1000 + val2 / 1000, &tmp); else ret = ina219_set_vbus_range_denom(chip, val, &tmp); break; default: ret = -EINVAL; } if (!ret && (tmp != config)) ret = regmap_write(chip->regmap, INA2XX_CONFIG, tmp); err: mutex_unlock(&chip->state_lock); return ret; } static ssize_t ina2xx_allow_async_readout_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ina2xx_chip_info *chip = iio_priv(dev_to_iio_dev(dev)); return sprintf(buf, "%d\n", chip->allow_async_readout); } static ssize_t ina2xx_allow_async_readout_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct ina2xx_chip_info *chip = iio_priv(dev_to_iio_dev(dev)); bool val; int ret; ret = strtobool(buf, &val); if (ret) return ret; chip->allow_async_readout = val; return len; } /* * Calibration register is set to the best value, which eliminates * truncation errors on calculating current register in hardware. * According to datasheet (INA 226: eq. 3, INA219: eq. 4) the best values * are 2048 for ina226 and 4096 for ina219. They are hardcoded as * calibration_value. */ static int ina2xx_set_calibration(struct ina2xx_chip_info *chip) { return regmap_write(chip->regmap, INA2XX_CALIBRATION, chip->config->calibration_value); } static int set_shunt_resistor(struct ina2xx_chip_info *chip, unsigned int val) { if (val == 0 || val > INT_MAX) return -EINVAL; chip->shunt_resistor_uohm = val; return 0; } static ssize_t ina2xx_shunt_resistor_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ina2xx_chip_info *chip = iio_priv(dev_to_iio_dev(dev)); int vals[2] = { chip->shunt_resistor_uohm, 1000000 }; return iio_format_value(buf, IIO_VAL_FRACTIONAL, 1, vals); } static ssize_t ina2xx_shunt_resistor_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct ina2xx_chip_info *chip = iio_priv(dev_to_iio_dev(dev)); int val, val_fract, ret; ret = iio_str_to_fixpoint(buf, 100000, &val, &val_fract); if (ret) return ret; ret = set_shunt_resistor(chip, val * 1000000 + val_fract); if (ret) return ret; return len; } #define INA219_CHAN(_type, _index, _address) { \ .type = (_type), \ .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), \ .scan_index = (_index), \ .scan_type = { \ .sign = 'u', \ .realbits = 16, \ .storagebits = 16, \ .endianness = IIO_CPU, \ } \ } #define INA226_CHAN(_type, _index, _address) { \ .type = (_type), \ .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, \ } \ } /* * Sampling Freq is a consequence of the integration times of * the Voltage channels. */ #define INA219_CHAN_VOLTAGE(_index, _address, _shift) { \ .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) | \ BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ .info_mask_separate_available = \ BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ .scan_index = (_index), \ .scan_type = { \ .sign = 'u', \ .shift = _shift, \ .realbits = 16 - _shift, \ .storagebits = 16, \ .endianness = IIO_LE, \ } \ } #define INA226_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_LE, \ } \ } static const struct iio_chan_spec ina226_channels[] = { INA226_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE), INA226_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE), INA226_CHAN(IIO_POWER, 2, INA2XX_POWER), INA226_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT), IIO_CHAN_SOFT_TIMESTAMP(4), }; static const struct iio_chan_spec ina219_channels[] = { INA219_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE, 0), INA219_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE, INA219_BUS_VOLTAGE_SHIFT), INA219_CHAN(IIO_POWER, 2, INA2XX_POWER), INA219_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT), IIO_CHAN_SOFT_TIMESTAMP(4), }; static int ina2xx_conversion_ready(struct iio_dev *indio_dev) { struct ina2xx_chip_info *chip = iio_priv(indio_dev); int ret; unsigned int alert; /* * Because the timer thread and the chip conversion clock * are asynchronous, the period difference will eventually * result in reading V[k-1] again, or skip V[k] at time Tk. * In order to resync the timer with the conversion process * we check the ConVersionReadyFlag. * On hardware that supports using the ALERT pin to toggle a * GPIO a triggered buffer could be used instead. * For now, we do an extra read of the MASK_ENABLE register (INA226) * resp. the BUS_VOLTAGE register (INA219). */ if (chip->config->chip_id == ina226) { ret = regmap_read(chip->regmap, INA226_MASK_ENABLE, &alert); alert &= INA226_CVRF; } else { ret = regmap_read(chip->regmap, INA2XX_BUS_VOLTAGE, &alert); alert &= INA219_CNVR; } if (ret < 0) return ret; return !!alert; } static int ina2xx_work_buffer(struct iio_dev *indio_dev) { struct ina2xx_chip_info *chip = iio_priv(indio_dev); int bit, ret, i = 0; s64 time; time = iio_get_time_ns(indio_dev); /* * Single register reads: bulk_read will not work with ina226/219 * as there is no auto-increment of the register pointer. */ for_each_set_bit(bit, indio_dev->active_scan_mask, indio_dev->masklength) { unsigned int val; ret = regmap_read(chip->regmap, INA2XX_SHUNT_VOLTAGE + bit, &val); if (ret < 0) return ret; chip->scan.chan[i++] = val; } iio_push_to_buffers_with_timestamp(indio_dev, &chip->scan, time); return 0; }; static int ina2xx_capture_thread(void *data) { struct iio_dev *indio_dev = data; struct ina2xx_chip_info *chip = iio_priv(indio_dev); int sampling_us = SAMPLING_PERIOD(chip); int ret; struct timespec64 next, now, delta; s64 delay_us; /* * Poll a bit faster than the chip internal Fs, in case * we wish to sync with the conversion ready flag. */ if (!chip->allow_async_readout) sampling_us -= 200; ktime_get_ts64(&next); do { while (!chip->allow_async_readout) { ret = ina2xx_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; } ret = ina2xx_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 ina2xx_buffer_enable(struct iio_dev *indio_dev) { struct ina2xx_chip_info *chip = iio_priv(indio_dev); unsigned int sampling_us = SAMPLING_PERIOD(chip); struct task_struct *task; dev_dbg(&indio_dev->dev, "Enabling buffer w/ scan_mask %02x, freq = %d, avg =%u\n", (unsigned int)(*indio_dev->active_scan_mask), 1000000 / sampling_us, chip->avg); dev_dbg(&indio_dev->dev, "Expected work period: %u us\n", sampling_us); dev_dbg(&indio_dev->dev, "Async readout mode: %d\n", chip->allow_async_readout); task = kthread_run(ina2xx_capture_thread, (void *)indio_dev, "%s:%d-%uus", indio_dev->name, iio_device_id(indio_dev), sampling_us); if (IS_ERR(task)) return PTR_ERR(task); chip->task = task; return 0; } static int ina2xx_buffer_disable(struct iio_dev *indio_dev) { struct ina2xx_chip_info *chip = iio_priv(indio_dev); if (chip->task) { kthread_stop(chip->task); chip->task = NULL; } return 0; } static const struct iio_buffer_setup_ops ina2xx_setup_ops = { .postenable = &ina2xx_buffer_enable, .predisable = &ina2xx_buffer_disable, }; static int ina2xx_debug_reg(struct iio_dev *indio_dev, unsigned reg, unsigned writeval, unsigned *readval) { struct ina2xx_chip_info *chip = iio_priv(indio_dev); if (!readval) return regmap_write(chip->regmap, reg, writeval); return regmap_read(chip->regmap, reg, readval); } /* Possible integration times for vshunt and vbus */ static IIO_CONST_ATTR_NAMED(ina219_integration_time_available, integration_time_available, "0.000084 0.000148 0.000276 0.000532 0.001060 0.002130 0.004260 0.008510 0.017020 0.034050 0.068100"); static IIO_CONST_ATTR_NAMED(ina226_integration_time_available, integration_time_available, "0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244"); static IIO_DEVICE_ATTR(in_allow_async_readout, S_IRUGO | S_IWUSR, ina2xx_allow_async_readout_show, ina2xx_allow_async_readout_store, 0); static IIO_DEVICE_ATTR(in_shunt_resistor, S_IRUGO | S_IWUSR, ina2xx_shunt_resistor_show, ina2xx_shunt_resistor_store, 0); static struct attribute *ina219_attributes[] = { &iio_dev_attr_in_allow_async_readout.dev_attr.attr, &iio_const_attr_ina219_integration_time_available.dev_attr.attr, &iio_dev_attr_in_shunt_resistor.dev_attr.attr, NULL, }; static struct attribute *ina226_attributes[] = { &iio_dev_attr_in_allow_async_readout.dev_attr.attr, &iio_const_attr_ina226_integration_time_available.dev_attr.attr, &iio_dev_attr_in_shunt_resistor.dev_attr.attr, NULL, }; static const struct attribute_group ina219_attribute_group = { .attrs = ina219_attributes, }; static const struct attribute_group ina226_attribute_group = { .attrs = ina226_attributes, }; static const struct iio_info ina219_info = { .attrs = &ina219_attribute_group, .read_raw = ina2xx_read_raw, .read_avail = ina2xx_read_avail, .write_raw = ina2xx_write_raw, .debugfs_reg_access = ina2xx_debug_reg, }; static const struct iio_info ina226_info = { .attrs = &ina226_attribute_group, .read_raw = ina2xx_read_raw, .write_raw = ina2xx_write_raw, .debugfs_reg_access = ina2xx_debug_reg, }; /* Initialize the configuration and calibration registers. */ static int ina2xx_init(struct ina2xx_chip_info *chip, unsigned int config) { int ret = regmap_write(chip->regmap, INA2XX_CONFIG, config); if (ret) return ret; return ina2xx_set_calibration(chip); } static int ina2xx_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct ina2xx_chip_info *chip; struct iio_dev *indio_dev; unsigned int val; enum ina2xx_ids type; int ret; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); if (!indio_dev) return -ENOMEM; chip = iio_priv(indio_dev); /* This is only used for device removal purposes. */ i2c_set_clientdata(client, indio_dev); chip->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config); if (IS_ERR(chip->regmap)) { dev_err(&client->dev, "failed to allocate register map\n"); return PTR_ERR(chip->regmap); } if (client->dev.of_node) type = (uintptr_t)of_device_get_match_data(&client->dev); else type = id->driver_data; chip->config = &ina2xx_config[type]; mutex_init(&chip->state_lock); if (of_property_read_u32(client->dev.of_node, "shunt-resistor", &val) < 0) { struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev); if (pdata) val = pdata->shunt_uohms; else val = INA2XX_RSHUNT_DEFAULT; } ret = set_shunt_resistor(chip, val); if (ret) return ret; /* Patch the current config register with default. */ val = chip->config->config_default; if (id->driver_data == ina226) { ina226_set_average(chip, INA226_DEFAULT_AVG, &val); ina226_set_int_time_vbus(chip, INA226_DEFAULT_IT, &val); ina226_set_int_time_vshunt(chip, INA226_DEFAULT_IT, &val); } else { chip->avg = 1; ina219_set_int_time_vbus(chip, INA219_DEFAULT_IT, &val); ina219_set_int_time_vshunt(chip, INA219_DEFAULT_IT, &val); ina219_set_vbus_range_denom(chip, INA219_DEFAULT_BRNG, &val); ina219_set_vshunt_pga_gain(chip, INA219_DEFAULT_PGA, &val); } ret = ina2xx_init(chip, val); if (ret) { dev_err(&client->dev, "error configuring the device\n"); return ret; } indio_dev->modes = INDIO_DIRECT_MODE; if (id->driver_data == ina226) { indio_dev->channels = ina226_channels; indio_dev->num_channels = ARRAY_SIZE(ina226_channels); indio_dev->info = &ina226_info; } else { indio_dev->channels = ina219_channels; indio_dev->num_channels = ARRAY_SIZE(ina219_channels); indio_dev->info = &ina219_info; } indio_dev->name = id->name; ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev, INDIO_BUFFER_SOFTWARE, &ina2xx_setup_ops); if (ret) return ret; return iio_device_register(indio_dev); } static int ina2xx_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); struct ina2xx_chip_info *chip = iio_priv(indio_dev); iio_device_unregister(indio_dev); /* Powerdown */ return regmap_update_bits(chip->regmap, INA2XX_CONFIG, INA2XX_MODE_MASK, 0); } static const struct i2c_device_id ina2xx_id[] = { {"ina219", ina219}, {"ina220", ina219}, {"ina226", ina226}, {"ina230", ina226}, {"ina231", ina226}, {} }; MODULE_DEVICE_TABLE(i2c, ina2xx_id); static const struct of_device_id ina2xx_of_match[] = { { .compatible = "ti,ina219", .data = (void *)ina219 }, { .compatible = "ti,ina220", .data = (void *)ina219 }, { .compatible = "ti,ina226", .data = (void *)ina226 }, { .compatible = "ti,ina230", .data = (void *)ina226 }, { .compatible = "ti,ina231", .data = (void *)ina226 }, {}, }; MODULE_DEVICE_TABLE(of, ina2xx_of_match); static struct i2c_driver ina2xx_driver = { .driver = { .name = KBUILD_MODNAME, .of_match_table = ina2xx_of_match, }, .probe = ina2xx_probe, .remove = ina2xx_remove, .id_table = ina2xx_id, }; module_i2c_driver(ina2xx_driver); MODULE_AUTHOR("Marc Titinger "); MODULE_DESCRIPTION("Texas Instruments INA2XX ADC driver"); MODULE_LICENSE("GPL v2");