Lines Matching +full:adc +full:- +full:diff +full:- +full:channels
1 // SPDX-License-Identifier: GPL-2.0+
3 * AD7124 SPI ADC driver
20 #include <linux/iio/adc/ad_sigma_delta.h>
180 .name = "ad7124-4",
185 .name = "ad7124-8",
201 diff_new = abs(val - array[i]); in ad7124_find_closest_match()
220 ret = ad_sd_read_reg(&st->sd, addr, bytes, &readval); in ad7124_spi_write_mask()
227 return ad_sd_write_reg(&st->sd, addr, bytes, readval); in ad7124_spi_write_mask()
235 st->adc_control &= ~AD7124_ADC_CTRL_MODE_MSK; in ad7124_set_mode()
236 st->adc_control |= AD7124_ADC_CTRL_MODE(mode); in ad7124_set_mode()
238 return ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL, 2, st->adc_control); in ad7124_set_mode()
246 val = st->channel_config[channel].ain | AD7124_CHANNEL_EN(1) | in ad7124_set_channel()
249 return ad_sd_write_reg(&st->sd, AD7124_CHANNEL(channel), 2, val); in ad7124_set_channel()
269 fclk = clk_get_rate(st->mclk); in ad7124_set_channel_odr()
289 st->channel_config[channel].odr = in ad7124_set_channel_odr()
310 st->channel_config[channel].pga_bits = res; in ad7124_set_channel_gain()
320 fadc = st->channel_config[channel].odr; in ad7124_get_3db_filter_freq()
322 switch (st->channel_config[channel].filter_type) { in ad7124_get_3db_filter_freq()
328 return -EINVAL; in ad7124_get_3db_filter_freq()
352 if (st->channel_config[channel].filter_type != new_filter) { in ad7124_set_3db_filter_freq()
355 st->channel_config[channel].filter_type = new_filter; in ad7124_set_3db_filter_freq()
381 ret = ad_sd_write_reg(&st->sd, in ad7124_read_raw()
382 AD7124_CHANNEL(chan->address), 2, in ad7124_read_raw()
383 st->channel_config[chan->address].ain | in ad7124_read_raw()
390 idx = st->channel_config[chan->address].pga_bits; in ad7124_read_raw()
391 *val = st->channel_config[chan->address].vref_mv; in ad7124_read_raw()
392 if (st->channel_config[chan->address].bipolar) in ad7124_read_raw()
393 *val2 = chan->scan_type.realbits - 1 + idx; in ad7124_read_raw()
395 *val2 = chan->scan_type.realbits + idx; in ad7124_read_raw()
399 if (st->channel_config[chan->address].bipolar) in ad7124_read_raw()
400 *val = -(1 << (chan->scan_type.realbits - 1)); in ad7124_read_raw()
406 *val = st->channel_config[chan->address].odr; in ad7124_read_raw()
410 *val = ad7124_get_3db_filter_freq(st, chan->scan_index); in ad7124_read_raw()
413 return -EINVAL; in ad7124_read_raw()
427 return -EINVAL; in ad7124_write_raw()
429 return ad7124_set_channel_odr(st, chan->address, val); in ad7124_write_raw()
432 return -EINVAL; in ad7124_write_raw()
434 if (st->channel_config[chan->address].bipolar) in ad7124_write_raw()
435 full_scale = 1 << (chan->scan_type.realbits - 1); in ad7124_write_raw()
437 full_scale = 1 << chan->scan_type.realbits; in ad7124_write_raw()
439 vref = st->channel_config[chan->address].vref_mv * 1000000LL; in ad7124_write_raw()
443 return ad7124_set_channel_gain(st, chan->address, gain); in ad7124_write_raw()
446 return -EINVAL; in ad7124_write_raw()
448 return ad7124_set_3db_filter_freq(st, chan->address, val); in ad7124_write_raw()
450 return -EINVAL; in ad7124_write_raw()
463 return -EINVAL; in ad7124_reg_access()
466 ret = ad_sd_read_reg(&st->sd, reg, ad7124_reg_size[reg], in ad7124_reg_access()
469 ret = ad_sd_write_reg(&st->sd, reg, ad7124_reg_size[reg], in ad7124_reg_access()
500 ret = ad_sd_reset(&st->sd, 64); in ad7124_soft_reset()
506 ret = ad_sd_read_reg(&st->sd, AD7124_STATUS, 1, &readval); in ad7124_soft_reset()
515 } while (--timeout); in ad7124_soft_reset()
517 dev_err(&st->sd.spi->dev, "Soft reset failed\n"); in ad7124_soft_reset()
519 return -EIO; in ad7124_soft_reset()
527 ret = ad_sd_read_reg(&st->sd, AD7124_ID, 1, &readval); in ad7124_check_chip_id()
534 if (chip_id != st->chip_info->chip_id) { in ad7124_check_chip_id()
535 dev_err(&st->sd.spi->dev, in ad7124_check_chip_id()
537 st->chip_info->chip_id, chip_id); in ad7124_check_chip_id()
538 return -ENODEV; in ad7124_check_chip_id()
542 dev_err(&st->sd.spi->dev, in ad7124_check_chip_id()
544 return -ENODEV; in ad7124_check_chip_id()
553 unsigned int refsel = st->channel_config[channel_number].refsel; in ad7124_init_channel_vref()
559 if (IS_ERR(st->vref[refsel])) { in ad7124_init_channel_vref()
560 dev_err(&st->sd.spi->dev, in ad7124_init_channel_vref()
563 return PTR_ERR(st->vref[refsel]); in ad7124_init_channel_vref()
565 st->channel_config[channel_number].vref_mv = in ad7124_init_channel_vref()
566 regulator_get_voltage(st->vref[refsel]); in ad7124_init_channel_vref()
568 st->channel_config[channel_number].vref_mv /= 1000; in ad7124_init_channel_vref()
571 st->channel_config[channel_number].vref_mv = 2500; in ad7124_init_channel_vref()
572 st->adc_control &= ~AD7124_ADC_CTRL_REF_EN_MSK; in ad7124_init_channel_vref()
573 st->adc_control |= AD7124_ADC_CTRL_REF_EN(1); in ad7124_init_channel_vref()
574 return ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL, in ad7124_init_channel_vref()
575 2, st->adc_control); in ad7124_init_channel_vref()
577 dev_err(&st->sd.spi->dev, "Invalid reference %d\n", refsel); in ad7124_init_channel_vref()
578 return -EINVAL; in ad7124_init_channel_vref()
594 st->num_channels = of_get_available_child_count(np); in ad7124_of_parse_channel_config()
595 if (!st->num_channels) { in ad7124_of_parse_channel_config()
596 dev_err(indio_dev->dev.parent, "no channel children\n"); in ad7124_of_parse_channel_config()
597 return -ENODEV; in ad7124_of_parse_channel_config()
600 chan = devm_kcalloc(indio_dev->dev.parent, st->num_channels, in ad7124_of_parse_channel_config()
603 return -ENOMEM; in ad7124_of_parse_channel_config()
605 chan_config = devm_kcalloc(indio_dev->dev.parent, st->num_channels, in ad7124_of_parse_channel_config()
608 return -ENOMEM; in ad7124_of_parse_channel_config()
610 indio_dev->channels = chan; in ad7124_of_parse_channel_config()
611 indio_dev->num_channels = st->num_channels; in ad7124_of_parse_channel_config()
612 st->channel_config = chan_config; in ad7124_of_parse_channel_config()
619 ret = of_property_read_u32_array(child, "diff-channels", in ad7124_of_parse_channel_config()
624 st->channel_config[channel].ain = AD7124_CHANNEL_AINP(ain[0]) | in ad7124_of_parse_channel_config()
626 st->channel_config[channel].bipolar = in ad7124_of_parse_channel_config()
629 ret = of_property_read_u32(child, "adi,reference-select", &tmp); in ad7124_of_parse_channel_config()
631 st->channel_config[channel].refsel = AD7124_INT_REF; in ad7124_of_parse_channel_config()
633 st->channel_config[channel].refsel = tmp; in ad7124_of_parse_channel_config()
635 st->channel_config[channel].buf_positive = in ad7124_of_parse_channel_config()
636 of_property_read_bool(child, "adi,buffered-positive"); in ad7124_of_parse_channel_config()
637 st->channel_config[channel].buf_negative = in ad7124_of_parse_channel_config()
638 of_property_read_bool(child, "adi,buffered-negative"); in ad7124_of_parse_channel_config()
659 fclk = clk_get_rate(st->mclk); in ad7124_setup()
661 return -EINVAL; in ad7124_setup()
668 ret = clk_set_rate(st->mclk, fclk); in ad7124_setup()
674 st->adc_control &= ~AD7124_ADC_CTRL_PWR_MSK; in ad7124_setup()
675 st->adc_control |= AD7124_ADC_CTRL_PWR(power_mode); in ad7124_setup()
676 ret = ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL, 2, st->adc_control); in ad7124_setup()
680 for (i = 0; i < st->num_channels; i++) { in ad7124_setup()
681 val = st->channel_config[i].ain | AD7124_CHANNEL_SETUP(i); in ad7124_setup()
682 ret = ad_sd_write_reg(&st->sd, AD7124_CHANNEL(i), 2, val); in ad7124_setup()
690 tmp = (st->channel_config[i].buf_positive << 1) + in ad7124_setup()
691 st->channel_config[i].buf_negative; in ad7124_setup()
693 val = AD7124_CONFIG_BIPOLAR(st->channel_config[i].bipolar) | in ad7124_setup()
694 AD7124_CONFIG_REF_SEL(st->channel_config[i].refsel) | in ad7124_setup()
696 ret = ad_sd_write_reg(&st->sd, AD7124_CONFIG(i), 2, val); in ad7124_setup()
702 * set all the enabled channels to this default value. in ad7124_setup()
717 info = of_device_get_match_data(&spi->dev); in ad7124_probe()
719 return -ENODEV; in ad7124_probe()
721 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); in ad7124_probe()
723 return -ENOMEM; in ad7124_probe()
727 st->chip_info = info; in ad7124_probe()
729 ad_sd_init(&st->sd, indio_dev, spi, &ad7124_sigma_delta_info); in ad7124_probe()
733 indio_dev->name = st->chip_info->name; in ad7124_probe()
734 indio_dev->modes = INDIO_DIRECT_MODE; in ad7124_probe()
735 indio_dev->info = &ad7124_info; in ad7124_probe()
737 ret = ad7124_of_parse_channel_config(indio_dev, spi->dev.of_node); in ad7124_probe()
741 for (i = 0; i < ARRAY_SIZE(st->vref); i++) { in ad7124_probe()
745 st->vref[i] = devm_regulator_get_optional(&spi->dev, in ad7124_probe()
747 if (PTR_ERR(st->vref[i]) == -ENODEV) in ad7124_probe()
749 else if (IS_ERR(st->vref[i])) in ad7124_probe()
750 return PTR_ERR(st->vref[i]); in ad7124_probe()
752 ret = regulator_enable(st->vref[i]); in ad7124_probe()
757 st->mclk = devm_clk_get(&spi->dev, "mclk"); in ad7124_probe()
758 if (IS_ERR(st->mclk)) { in ad7124_probe()
759 ret = PTR_ERR(st->mclk); in ad7124_probe()
763 ret = clk_prepare_enable(st->mclk); in ad7124_probe()
785 dev_err(&spi->dev, "Failed to register iio device\n"); in ad7124_probe()
794 clk_disable_unprepare(st->mclk); in ad7124_probe()
796 for (i = ARRAY_SIZE(st->vref) - 1; i >= 0; i--) { in ad7124_probe()
797 if (!IS_ERR_OR_NULL(st->vref[i])) in ad7124_probe()
798 regulator_disable(st->vref[i]); in ad7124_probe()
812 clk_disable_unprepare(st->mclk); in ad7124_remove()
814 for (i = ARRAY_SIZE(st->vref) - 1; i >= 0; i--) { in ad7124_remove()
815 if (!IS_ERR_OR_NULL(st->vref[i])) in ad7124_remove()
816 regulator_disable(st->vref[i]); in ad7124_remove()
823 { .compatible = "adi,ad7124-4",
825 { .compatible = "adi,ad7124-8",