// SPDX-License-Identifier: GPL-2.0-only /* * AD7785/AD7792/AD7793/AD7794/AD7795 SPI ADC driver * * Copyright 2011-2012 Analog Devices Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Registers */ #define AD7793_REG_COMM 0 /* Communications Register (WO, 8-bit) */ #define AD7793_REG_STAT 0 /* Status Register (RO, 8-bit) */ #define AD7793_REG_MODE 1 /* Mode Register (RW, 16-bit */ #define AD7793_REG_CONF 2 /* Configuration Register (RW, 16-bit) */ #define AD7793_REG_DATA 3 /* Data Register (RO, 16-/24-bit) */ #define AD7793_REG_ID 4 /* ID Register (RO, 8-bit) */ #define AD7793_REG_IO 5 /* IO Register (RO, 8-bit) */ #define AD7793_REG_OFFSET 6 /* Offset Register (RW, 16-bit * (AD7792)/24-bit (AD7793)) */ #define AD7793_REG_FULLSALE 7 /* Full-Scale Register * (RW, 16-bit (AD7792)/24-bit (AD7793)) */ /* Communications Register Bit Designations (AD7793_REG_COMM) */ #define AD7793_COMM_WEN (1 << 7) /* Write Enable */ #define AD7793_COMM_WRITE (0 << 6) /* Write Operation */ #define AD7793_COMM_READ (1 << 6) /* Read Operation */ #define AD7793_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */ #define AD7793_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */ /* Status Register Bit Designations (AD7793_REG_STAT) */ #define AD7793_STAT_RDY (1 << 7) /* Ready */ #define AD7793_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */ #define AD7793_STAT_CH3 (1 << 2) /* Channel 3 */ #define AD7793_STAT_CH2 (1 << 1) /* Channel 2 */ #define AD7793_STAT_CH1 (1 << 0) /* Channel 1 */ /* Mode Register Bit Designations (AD7793_REG_MODE) */ #define AD7793_MODE_SEL(x) (((x) & 0x7) << 13) /* Operation Mode Select */ #define AD7793_MODE_SEL_MASK (0x7 << 13) /* Operation Mode Select mask */ #define AD7793_MODE_CLKSRC(x) (((x) & 0x3) << 6) /* ADC Clock Source Select */ #define AD7793_MODE_RATE(x) ((x) & 0xF) /* Filter Update Rate Select */ #define AD7793_MODE_CONT 0 /* Continuous Conversion Mode */ #define AD7793_MODE_SINGLE 1 /* Single Conversion Mode */ #define AD7793_MODE_IDLE 2 /* Idle Mode */ #define AD7793_MODE_PWRDN 3 /* Power-Down Mode */ #define AD7793_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ #define AD7793_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ #define AD7793_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ #define AD7793_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ #define AD7793_CLK_INT 0 /* Internal 64 kHz Clock not * available at the CLK pin */ #define AD7793_CLK_INT_CO 1 /* Internal 64 kHz Clock available * at the CLK pin */ #define AD7793_CLK_EXT 2 /* External 64 kHz Clock */ #define AD7793_CLK_EXT_DIV2 3 /* External Clock divided by 2 */ /* Configuration Register Bit Designations (AD7793_REG_CONF) */ #define AD7793_CONF_VBIAS(x) (((x) & 0x3) << 14) /* Bias Voltage * Generator Enable */ #define AD7793_CONF_BO_EN (1 << 13) /* Burnout Current Enable */ #define AD7793_CONF_UNIPOLAR (1 << 12) /* Unipolar/Bipolar Enable */ #define AD7793_CONF_BOOST (1 << 11) /* Boost Enable */ #define AD7793_CONF_GAIN(x) (((x) & 0x7) << 8) /* Gain Select */ #define AD7793_CONF_REFSEL(x) ((x) << 6) /* INT/EXT Reference Select */ #define AD7793_CONF_BUF (1 << 4) /* Buffered Mode Enable */ #define AD7793_CONF_CHAN(x) ((x) & 0xf) /* Channel select */ #define AD7793_CONF_CHAN_MASK 0xf /* Channel select mask */ #define AD7793_CH_AIN1P_AIN1M 0 /* AIN1(+) - AIN1(-) */ #define AD7793_CH_AIN2P_AIN2M 1 /* AIN2(+) - AIN2(-) */ #define AD7793_CH_AIN3P_AIN3M 2 /* AIN3(+) - AIN3(-) */ #define AD7793_CH_AIN1M_AIN1M 3 /* AIN1(-) - AIN1(-) */ #define AD7793_CH_TEMP 6 /* Temp Sensor */ #define AD7793_CH_AVDD_MONITOR 7 /* AVDD Monitor */ #define AD7795_CH_AIN4P_AIN4M 4 /* AIN4(+) - AIN4(-) */ #define AD7795_CH_AIN5P_AIN5M 5 /* AIN5(+) - AIN5(-) */ #define AD7795_CH_AIN6P_AIN6M 6 /* AIN6(+) - AIN6(-) */ #define AD7795_CH_AIN1M_AIN1M 8 /* AIN1(-) - AIN1(-) */ /* ID Register Bit Designations (AD7793_REG_ID) */ #define AD7785_ID 0x3 #define AD7792_ID 0xA #define AD7793_ID 0xB #define AD7794_ID 0xF #define AD7795_ID 0xF #define AD7796_ID 0xA #define AD7797_ID 0xB #define AD7798_ID 0x8 #define AD7799_ID 0x9 #define AD7793_ID_MASK 0xF /* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */ #define AD7793_IO_IEXC1_IOUT1_IEXC2_IOUT2 0 /* IEXC1 connect to IOUT1, * IEXC2 connect to IOUT2 */ #define AD7793_IO_IEXC1_IOUT2_IEXC2_IOUT1 1 /* IEXC1 connect to IOUT2, * IEXC2 connect to IOUT1 */ #define AD7793_IO_IEXC1_IEXC2_IOUT1 2 /* Both current sources * IEXC1,2 connect to IOUT1 */ #define AD7793_IO_IEXC1_IEXC2_IOUT2 3 /* Both current sources * IEXC1,2 connect to IOUT2 */ #define AD7793_IO_IXCEN_10uA (1 << 0) /* Excitation Current 10uA */ #define AD7793_IO_IXCEN_210uA (2 << 0) /* Excitation Current 210uA */ #define AD7793_IO_IXCEN_1mA (3 << 0) /* Excitation Current 1mA */ /* NOTE: * The AD7792/AD7793 features a dual use data out ready DOUT/RDY output. * In order to avoid contentions on the SPI bus, it's therefore necessary * to use spi bus locking. * * The DOUT/RDY output must also be wired to an interrupt capable GPIO. */ #define AD7793_FLAG_HAS_CLKSEL BIT(0) #define AD7793_FLAG_HAS_REFSEL BIT(1) #define AD7793_FLAG_HAS_VBIAS BIT(2) #define AD7793_HAS_EXITATION_CURRENT BIT(3) #define AD7793_FLAG_HAS_GAIN BIT(4) #define AD7793_FLAG_HAS_BUFFER BIT(5) struct ad7793_chip_info { unsigned int id; const struct iio_chan_spec *channels; unsigned int num_channels; unsigned int flags; const struct iio_info *iio_info; const u16 *sample_freq_avail; }; struct ad7793_state { const struct ad7793_chip_info *chip_info; struct regulator *reg; u16 int_vref_mv; u16 mode; u16 conf; u32 scale_avail[8][2]; struct ad_sigma_delta sd; }; enum ad7793_supported_device_ids { ID_AD7785, ID_AD7792, ID_AD7793, ID_AD7794, ID_AD7795, ID_AD7796, ID_AD7797, ID_AD7798, ID_AD7799, }; static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd) { return container_of(sd, struct ad7793_state, sd); } static int ad7793_set_channel(struct ad_sigma_delta *sd, unsigned int channel) { struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); st->conf &= ~AD7793_CONF_CHAN_MASK; st->conf |= AD7793_CONF_CHAN(channel); return ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 2, st->conf); } static int ad7793_set_mode(struct ad_sigma_delta *sd, enum ad_sigma_delta_mode mode) { struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); st->mode &= ~AD7793_MODE_SEL_MASK; st->mode |= AD7793_MODE_SEL(mode); return ad_sd_write_reg(&st->sd, AD7793_REG_MODE, 2, st->mode); } static const struct ad_sigma_delta_info ad7793_sigma_delta_info = { .set_channel = ad7793_set_channel, .set_mode = ad7793_set_mode, .has_registers = true, .addr_shift = 3, .read_mask = BIT(6), .irq_flags = IRQF_TRIGGER_FALLING, }; static const struct ad_sd_calib_data ad7793_calib_arr[6] = { {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M}, {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M}, {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M}, {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M}, {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M}, {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M} }; static int ad7793_calibrate_all(struct ad7793_state *st) { return ad_sd_calibrate_all(&st->sd, ad7793_calib_arr, ARRAY_SIZE(ad7793_calib_arr)); } static int ad7793_check_platform_data(struct ad7793_state *st, const struct ad7793_platform_data *pdata) { if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 || pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) && ((pdata->exitation_current != AD7793_IX_10uA) && (pdata->exitation_current != AD7793_IX_210uA))) return -EINVAL; if (!(st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) && pdata->clock_src != AD7793_CLK_SRC_INT) return -EINVAL; if (!(st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) && pdata->refsel != AD7793_REFSEL_REFIN1) return -EINVAL; if (!(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) && pdata->bias_voltage != AD7793_BIAS_VOLTAGE_DISABLED) return -EINVAL; if (!(st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) && pdata->exitation_current != AD7793_IX_DISABLED) return -EINVAL; return 0; } static int ad7793_setup(struct iio_dev *indio_dev, const struct ad7793_platform_data *pdata, unsigned int vref_mv) { struct ad7793_state *st = iio_priv(indio_dev); int i, ret; unsigned long long scale_uv; u32 id; ret = ad7793_check_platform_data(st, pdata); if (ret) return ret; /* reset the serial interface */ ret = ad_sd_reset(&st->sd, 32); if (ret < 0) goto out; usleep_range(500, 2000); /* Wait for at least 500us */ /* write/read test for device presence */ ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id); if (ret) goto out; id &= AD7793_ID_MASK; if (id != st->chip_info->id) { ret = -ENODEV; dev_err(&st->sd.spi->dev, "device ID query failed\n"); goto out; } st->mode = AD7793_MODE_RATE(1); st->conf = 0; if (st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src); if (st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) st->conf |= AD7793_CONF_REFSEL(pdata->refsel); if (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage); if (pdata->buffered || !(st->chip_info->flags & AD7793_FLAG_HAS_BUFFER)) st->conf |= AD7793_CONF_BUF; if (pdata->boost_enable && (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS)) st->conf |= AD7793_CONF_BOOST; if (pdata->burnout_current) st->conf |= AD7793_CONF_BO_EN; if (pdata->unipolar) st->conf |= AD7793_CONF_UNIPOLAR; if (!(st->chip_info->flags & AD7793_FLAG_HAS_GAIN)) st->conf |= AD7793_CONF_GAIN(7); ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE); if (ret) goto out; ret = ad7793_set_channel(&st->sd, 0); if (ret) goto out; if (st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) { ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1, pdata->exitation_current | (pdata->current_source_direction << 2)); if (ret) goto out; } ret = ad7793_calibrate_all(st); if (ret) goto out; /* Populate available ADC input ranges */ for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { scale_uv = ((u64)vref_mv * 100000000) >> (st->chip_info->channels[0].scan_type.realbits - (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1)); scale_uv >>= i; st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; st->scale_avail[i][0] = scale_uv; } return 0; out: dev_err(&st->sd.spi->dev, "setup failed\n"); return ret; } static const u16 ad7793_sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, 33, 19, 17, 16, 12, 10, 8, 6, 4}; static const u16 ad7797_sample_freq_avail[16] = {0, 0, 0, 123, 62, 50, 0, 33, 0, 17, 16, 12, 10, 8, 6, 4}; static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4"); static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797, sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4"); static int ad7793_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { struct ad7793_state *st = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_SCALE: *vals = (int *)st->scale_avail; *type = IIO_VAL_INT_PLUS_NANO; /* Values are stored in a 2D matrix */ *length = ARRAY_SIZE(st->scale_avail) * 2; return IIO_AVAIL_LIST; default: return -EINVAL; } } static struct attribute *ad7793_attributes[] = { &iio_const_attr_sampling_frequency_available.dev_attr.attr, NULL }; static const struct attribute_group ad7793_attribute_group = { .attrs = ad7793_attributes, }; static struct attribute *ad7797_attributes[] = { &iio_const_attr_sampling_frequency_available_ad7797.dev_attr.attr, NULL }; static const struct attribute_group ad7797_attribute_group = { .attrs = ad7797_attributes, }; static int ad7793_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long m) { struct ad7793_state *st = iio_priv(indio_dev); int ret; unsigned long long scale_uv; bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR); switch (m) { case IIO_CHAN_INFO_RAW: ret = ad_sigma_delta_single_conversion(indio_dev, chan, val); if (ret < 0) return ret; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: switch (chan->type) { case IIO_VOLTAGE: if (chan->differential) { *val = st-> scale_avail[(st->conf >> 8) & 0x7][0]; *val2 = st-> scale_avail[(st->conf >> 8) & 0x7][1]; return IIO_VAL_INT_PLUS_NANO; } /* 1170mV / 2^23 * 6 */ scale_uv = (1170ULL * 1000000000ULL * 6ULL); break; case IIO_TEMP: /* 1170mV / 0.81 mV/C / 2^23 */ scale_uv = 1444444444444444ULL; break; default: return -EINVAL; } scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1)); *val = 0; *val2 = scale_uv; return IIO_VAL_INT_PLUS_NANO; case IIO_CHAN_INFO_OFFSET: if (!unipolar) *val = -(1 << (chan->scan_type.realbits - 1)); else *val = 0; /* Kelvin to Celsius */ if (chan->type == IIO_TEMP) { unsigned long long offset; unsigned int shift; shift = chan->scan_type.realbits - (unipolar ? 0 : 1); offset = 273ULL << shift; do_div(offset, 1444); *val -= offset; } return IIO_VAL_INT; case IIO_CHAN_INFO_SAMP_FREQ: *val = st->chip_info ->sample_freq_avail[AD7793_MODE_RATE(st->mode)]; return IIO_VAL_INT; } return -EINVAL; } static int ad7793_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct ad7793_state *st = iio_priv(indio_dev); int ret, i; unsigned int tmp; ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; switch (mask) { case IIO_CHAN_INFO_SCALE: ret = -EINVAL; for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) if (val2 == st->scale_avail[i][1]) { ret = 0; tmp = st->conf; st->conf &= ~AD7793_CONF_GAIN(-1); st->conf |= AD7793_CONF_GAIN(i); if (tmp == st->conf) break; ad_sd_write_reg(&st->sd, AD7793_REG_CONF, sizeof(st->conf), st->conf); ad7793_calibrate_all(st); break; } break; case IIO_CHAN_INFO_SAMP_FREQ: if (!val) { ret = -EINVAL; break; } for (i = 0; i < 16; i++) if (val == st->chip_info->sample_freq_avail[i]) break; if (i == 16) { ret = -EINVAL; break; } st->mode &= ~AD7793_MODE_RATE(-1); st->mode |= AD7793_MODE_RATE(i); ad_sd_write_reg(&st->sd, AD7793_REG_MODE, sizeof(st->mode), st->mode); break; default: ret = -EINVAL; } iio_device_release_direct_mode(indio_dev); return ret; } static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, long mask) { return IIO_VAL_INT_PLUS_NANO; } static const struct iio_info ad7793_info = { .read_raw = &ad7793_read_raw, .write_raw = &ad7793_write_raw, .write_raw_get_fmt = &ad7793_write_raw_get_fmt, .read_avail = ad7793_read_avail, .attrs = &ad7793_attribute_group, .validate_trigger = ad_sd_validate_trigger, }; static const struct iio_info ad7797_info = { .read_raw = &ad7793_read_raw, .write_raw = &ad7793_write_raw, .write_raw_get_fmt = &ad7793_write_raw_get_fmt, .attrs = &ad7797_attribute_group, .validate_trigger = ad_sd_validate_trigger, }; #define __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift, _extend_name, _type, _mask_type_av, _mask_all) \ { \ .type = (_type), \ .differential = (_channel2 == -1 ? 0 : 1), \ .indexed = 1, \ .channel = (_channel1), \ .channel2 = (_channel2), \ .address = (_address), \ .extend_name = (_extend_name), \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_OFFSET), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ .info_mask_shared_by_type_available = (_mask_type_av), \ .info_mask_shared_by_all = _mask_all, \ .scan_index = (_si), \ .scan_type = { \ .sign = 'u', \ .realbits = (_bits), \ .storagebits = (_storagebits), \ .shift = (_shift), \ .endianness = IIO_BE, \ }, \ } #define AD7793_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift) \ __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift, NULL, IIO_VOLTAGE, \ BIT(IIO_CHAN_INFO_SCALE), \ BIT(IIO_CHAN_INFO_SAMP_FREQ)) #define AD7793_SHORTED_CHANNEL(_si, _channel, _address, _bits, \ _storagebits, _shift) \ __AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \ _storagebits, _shift, "shorted", IIO_VOLTAGE, \ BIT(IIO_CHAN_INFO_SCALE), \ BIT(IIO_CHAN_INFO_SAMP_FREQ)) #define AD7793_TEMP_CHANNEL(_si, _address, _bits, _storagebits, _shift) \ __AD7793_CHANNEL(_si, 0, -1, _address, _bits, \ _storagebits, _shift, NULL, IIO_TEMP, \ 0, \ BIT(IIO_CHAN_INFO_SAMP_FREQ)) #define AD7793_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \ _shift) \ __AD7793_CHANNEL(_si, _channel, -1, _address, _bits, \ _storagebits, _shift, "supply", IIO_VOLTAGE, \ 0, \ BIT(IIO_CHAN_INFO_SAMP_FREQ)) #define AD7797_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift) \ __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift, NULL, IIO_VOLTAGE, \ 0, \ BIT(IIO_CHAN_INFO_SAMP_FREQ)) #define AD7797_SHORTED_CHANNEL(_si, _channel, _address, _bits, \ _storagebits, _shift) \ __AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \ _storagebits, _shift, "shorted", IIO_VOLTAGE, \ 0, \ BIT(IIO_CHAN_INFO_SAMP_FREQ)) #define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \ const struct iio_chan_spec _name##_channels[] = { \ AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \ AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \ AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \ AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \ AD7793_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \ AD7793_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \ IIO_CHAN_SOFT_TIMESTAMP(6), \ } #define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \ const struct iio_chan_spec _name##_channels[] = { \ AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ AD7793_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \ AD7793_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \ AD7793_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \ AD7793_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ AD7793_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \ AD7793_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ IIO_CHAN_SOFT_TIMESTAMP(9), \ } #define DECLARE_AD7797_CHANNELS(_name, _b, _sb) \ const struct iio_chan_spec _name##_channels[] = { \ AD7797_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ AD7797_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ AD7793_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \ AD7793_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ IIO_CHAN_SOFT_TIMESTAMP(4), \ } #define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \ const struct iio_chan_spec _name##_channels[] = { \ AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ AD7793_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ IIO_CHAN_SOFT_TIMESTAMP(5), \ } static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4); static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0); static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0); static DECLARE_AD7795_CHANNELS(ad7794, 16, 32); static DECLARE_AD7795_CHANNELS(ad7795, 24, 32); static DECLARE_AD7797_CHANNELS(ad7796, 16, 16); static DECLARE_AD7797_CHANNELS(ad7797, 24, 32); static DECLARE_AD7799_CHANNELS(ad7798, 16, 16); static DECLARE_AD7799_CHANNELS(ad7799, 24, 32); static const struct ad7793_chip_info ad7793_chip_info_tbl[] = { [ID_AD7785] = { .id = AD7785_ID, .channels = ad7785_channels, .num_channels = ARRAY_SIZE(ad7785_channels), .iio_info = &ad7793_info, .sample_freq_avail = ad7793_sample_freq_avail, .flags = AD7793_FLAG_HAS_CLKSEL | AD7793_FLAG_HAS_REFSEL | AD7793_FLAG_HAS_VBIAS | AD7793_HAS_EXITATION_CURRENT | AD7793_FLAG_HAS_GAIN | AD7793_FLAG_HAS_BUFFER, }, [ID_AD7792] = { .id = AD7792_ID, .channels = ad7792_channels, .num_channels = ARRAY_SIZE(ad7792_channels), .iio_info = &ad7793_info, .sample_freq_avail = ad7793_sample_freq_avail, .flags = AD7793_FLAG_HAS_CLKSEL | AD7793_FLAG_HAS_REFSEL | AD7793_FLAG_HAS_VBIAS | AD7793_HAS_EXITATION_CURRENT | AD7793_FLAG_HAS_GAIN | AD7793_FLAG_HAS_BUFFER, }, [ID_AD7793] = { .id = AD7793_ID, .channels = ad7793_channels, .num_channels = ARRAY_SIZE(ad7793_channels), .iio_info = &ad7793_info, .sample_freq_avail = ad7793_sample_freq_avail, .flags = AD7793_FLAG_HAS_CLKSEL | AD7793_FLAG_HAS_REFSEL | AD7793_FLAG_HAS_VBIAS | AD7793_HAS_EXITATION_CURRENT | AD7793_FLAG_HAS_GAIN | AD7793_FLAG_HAS_BUFFER, }, [ID_AD7794] = { .id = AD7794_ID, .channels = ad7794_channels, .num_channels = ARRAY_SIZE(ad7794_channels), .iio_info = &ad7793_info, .sample_freq_avail = ad7793_sample_freq_avail, .flags = AD7793_FLAG_HAS_CLKSEL | AD7793_FLAG_HAS_REFSEL | AD7793_FLAG_HAS_VBIAS | AD7793_HAS_EXITATION_CURRENT | AD7793_FLAG_HAS_GAIN | AD7793_FLAG_HAS_BUFFER, }, [ID_AD7795] = { .id = AD7795_ID, .channels = ad7795_channels, .num_channels = ARRAY_SIZE(ad7795_channels), .iio_info = &ad7793_info, .sample_freq_avail = ad7793_sample_freq_avail, .flags = AD7793_FLAG_HAS_CLKSEL | AD7793_FLAG_HAS_REFSEL | AD7793_FLAG_HAS_VBIAS | AD7793_HAS_EXITATION_CURRENT | AD7793_FLAG_HAS_GAIN | AD7793_FLAG_HAS_BUFFER, }, [ID_AD7796] = { .id = AD7796_ID, .channels = ad7796_channels, .num_channels = ARRAY_SIZE(ad7796_channels), .iio_info = &ad7797_info, .sample_freq_avail = ad7797_sample_freq_avail, .flags = AD7793_FLAG_HAS_CLKSEL, }, [ID_AD7797] = { .id = AD7797_ID, .channels = ad7797_channels, .num_channels = ARRAY_SIZE(ad7797_channels), .iio_info = &ad7797_info, .sample_freq_avail = ad7797_sample_freq_avail, .flags = AD7793_FLAG_HAS_CLKSEL, }, [ID_AD7798] = { .id = AD7798_ID, .channels = ad7798_channels, .num_channels = ARRAY_SIZE(ad7798_channels), .iio_info = &ad7793_info, .sample_freq_avail = ad7793_sample_freq_avail, .flags = AD7793_FLAG_HAS_GAIN | AD7793_FLAG_HAS_BUFFER, }, [ID_AD7799] = { .id = AD7799_ID, .channels = ad7799_channels, .num_channels = ARRAY_SIZE(ad7799_channels), .iio_info = &ad7793_info, .sample_freq_avail = ad7793_sample_freq_avail, .flags = AD7793_FLAG_HAS_GAIN | AD7793_FLAG_HAS_BUFFER, }, }; static int ad7793_probe(struct spi_device *spi) { const struct ad7793_platform_data *pdata = spi->dev.platform_data; struct ad7793_state *st; struct iio_dev *indio_dev; int ret, vref_mv = 0; if (!pdata) { dev_err(&spi->dev, "no platform data?\n"); return -ENODEV; } if (!spi->irq) { dev_err(&spi->dev, "no IRQ?\n"); return -ENODEV; } indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); if (indio_dev == NULL) return -ENOMEM; st = iio_priv(indio_dev); ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info); if (pdata->refsel != AD7793_REFSEL_INTERNAL) { st->reg = devm_regulator_get(&spi->dev, "refin"); if (IS_ERR(st->reg)) return PTR_ERR(st->reg); ret = regulator_enable(st->reg); if (ret) return ret; vref_mv = regulator_get_voltage(st->reg); if (vref_mv < 0) { ret = vref_mv; goto error_disable_reg; } vref_mv /= 1000; } else { vref_mv = 1170; /* Build-in ref */ } st->chip_info = &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data]; spi_set_drvdata(spi, indio_dev); indio_dev->name = spi_get_device_id(spi)->name; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = st->chip_info->channels; indio_dev->num_channels = st->chip_info->num_channels; indio_dev->info = st->chip_info->iio_info; ret = ad_sd_setup_buffer_and_trigger(indio_dev); if (ret) goto error_disable_reg; ret = ad7793_setup(indio_dev, pdata, vref_mv); if (ret) goto error_remove_trigger; ret = iio_device_register(indio_dev); if (ret) goto error_remove_trigger; return 0; error_remove_trigger: ad_sd_cleanup_buffer_and_trigger(indio_dev); error_disable_reg: if (pdata->refsel != AD7793_REFSEL_INTERNAL) regulator_disable(st->reg); return ret; } static int ad7793_remove(struct spi_device *spi) { const struct ad7793_platform_data *pdata = spi->dev.platform_data; struct iio_dev *indio_dev = spi_get_drvdata(spi); struct ad7793_state *st = iio_priv(indio_dev); iio_device_unregister(indio_dev); ad_sd_cleanup_buffer_and_trigger(indio_dev); if (pdata->refsel != AD7793_REFSEL_INTERNAL) regulator_disable(st->reg); return 0; } static const struct spi_device_id ad7793_id[] = { {"ad7785", ID_AD7785}, {"ad7792", ID_AD7792}, {"ad7793", ID_AD7793}, {"ad7794", ID_AD7794}, {"ad7795", ID_AD7795}, {"ad7796", ID_AD7796}, {"ad7797", ID_AD7797}, {"ad7798", ID_AD7798}, {"ad7799", ID_AD7799}, {} }; MODULE_DEVICE_TABLE(spi, ad7793_id); static struct spi_driver ad7793_driver = { .driver = { .name = "ad7793", }, .probe = ad7793_probe, .remove = ad7793_remove, .id_table = ad7793_id, }; module_spi_driver(ad7793_driver); MODULE_AUTHOR("Michael Hennerich "); MODULE_DESCRIPTION("Analog Devices AD7793 and similar ADCs"); MODULE_LICENSE("GPL v2");