1 // SPDX-License-Identifier: GPL-2.0
129 #define AD7280A_NUM_CH			(AD7280A_AUX_ADC_6_REG - \
135 					     (c) - AD7280A_CELLS_PER_DEV)
143 /* 5-bit device address is sent LSB first */
203 	unsigned char crc = ad7280_calc_crc8(st->crc_tab, val >> 10);  in ad7280_check_crc()
206 		return -EIO;  in ad7280_check_crc()
215  * conversion delays and acquisition time options it may take up to 250us, in
221 	if (st->readback_delay_us < 50)  in ad7280_delay()
222 		udelay(st->readback_delay_us);  in ad7280_delay()
231 		.tx_buf	= &st->tx,  in __ad7280_read32()
232 		.rx_buf = &st->rx,  in __ad7280_read32()
233 		.len = sizeof(st->tx),  in __ad7280_read32()
236 	st->tx = cpu_to_be32(AD7280A_READ_TXVAL);  in __ad7280_read32()
238 	ret = spi_sync_transfer(st->spi, &t, 1);  in __ad7280_read32()
242 	*val = be32_to_cpu(st->rx);  in __ad7280_read32()
256 			ad7280_calc_crc8(st->crc_tab, reg >> 11));  in ad7280_write()
260 	st->tx = cpu_to_be32(reg);  in ad7280_write()
262 	return spi_write(st->spi, &st->tx, sizeof(st->tx));  in ad7280_write()
278 				      st->oversampling_ratio));  in ad7280_read_reg()
289 				      st->oversampling_ratio));  in ad7280_read_reg()
304 		return -EIO;  in ad7280_read_reg()
308 		return -EFAULT;  in ad7280_read_reg()
330 				      st->oversampling_ratio));  in ad7280_read_channel()
342 				      st->oversampling_ratio));  in ad7280_read_channel()
353 		return -EIO;  in ad7280_read_channel()
357 		return -EFAULT;  in ad7280_read_channel()
381 				      st->oversampling_ratio));  in ad7280_read_all_channels()
393 			return -EIO;  in ad7280_read_all_channels()
412 		     FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, st->oversampling_ratio));  in ad7280_sw_power_down()
425 			   st->ctrl_lb);  in ad7280_chain_setup()
434 			   st->ctrl_lb);  in ad7280_chain_setup()
449 			return n - 1;  in ad7280_chain_setup()
452 			ret = -EIO;  in ad7280_chain_setup()
457 			ret = -EIO;  in ad7280_chain_setup()
461 	ret = -EFAULT;  in ad7280_chain_setup()
466 		     FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, st->oversampling_ratio));  in ad7280_chain_setup()
478 			  !!(st->cb_mask[chan->address >> 8] &  in ad7280_show_balance_sw()
479 			     BIT(chan->address & 0xFF)));  in ad7280_show_balance_sw()
496 	devaddr = chan->address >> 8;  in ad7280_store_balance_sw()
497 	ch = chan->address & 0xFF;  in ad7280_store_balance_sw()
499 	mutex_lock(&st->lock);  in ad7280_store_balance_sw()
501 		st->cb_mask[devaddr] |= BIT(ch);  in ad7280_store_balance_sw()
503 		st->cb_mask[devaddr] &= ~BIT(ch);  in ad7280_store_balance_sw()
507 				      st->cb_mask[devaddr]));  in ad7280_store_balance_sw()
508 	mutex_unlock(&st->lock);  in ad7280_store_balance_sw()
522 	mutex_lock(&st->lock);  in ad7280_show_balance_timer()
523 	ret = ad7280_read_reg(st, chan->address >> 8,  in ad7280_show_balance_timer()
524 			      (chan->address & 0xFF) + AD7280A_CB1_TIMER_REG);  in ad7280_show_balance_timer()
525 	mutex_unlock(&st->lock);  in ad7280_show_balance_timer()
552 		return -EINVAL;  in ad7280_store_balance_timer()
554 	mutex_lock(&st->lock);  in ad7280_store_balance_timer()
555 	ret = ad7280_write(st, chan->address >> 8,  in ad7280_store_balance_timer()
556 			   (chan->address & 0xFF) + AD7280A_CB1_TIMER_REG, 0,  in ad7280_store_balance_timer()
558 	mutex_unlock(&st->lock);  in ad7280_store_balance_timer()
593 	chan->type = IIO_VOLTAGE;  in ad7280_voltage_channel_init()
594 	chan->differential = 1;  in ad7280_voltage_channel_init()
595 	chan->channel = i;  in ad7280_voltage_channel_init()
596 	chan->channel2 = chan->channel + 1;  in ad7280_voltage_channel_init()
598 		chan->event_spec = ad7280_events;  in ad7280_voltage_channel_init()
599 		chan->num_event_specs = ARRAY_SIZE(ad7280_events);  in ad7280_voltage_channel_init()
601 	chan->ext_info = ad7280_cell_ext_info;  in ad7280_voltage_channel_init()
607 	chan->type = IIO_TEMP;  in ad7280_temp_channel_init()
608 	chan->channel = i;  in ad7280_temp_channel_init()
610 		chan->event_spec = ad7280_events;  in ad7280_temp_channel_init()
611 		chan->num_event_specs = ARRAY_SIZE(ad7280_events);  in ad7280_temp_channel_init()
618 	chan->indexed = 1;  in ad7280_common_fields_init()
619 	chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);  in ad7280_common_fields_init()
620 	chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);  in ad7280_common_fields_init()
621 	chan->info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO);  in ad7280_common_fields_init()
622 	chan->address = addr;  in ad7280_common_fields_init()
623 	chan->scan_index = cnt;  in ad7280_common_fields_init()
624 	chan->scan_type.sign = 'u';  in ad7280_common_fields_init()
625 	chan->scan_type.realbits = 12;  in ad7280_common_fields_init()
626 	chan->scan_type.storagebits = 32;  in ad7280_common_fields_init()
632 	chan->type = IIO_VOLTAGE;  in ad7280_total_voltage_channel_init()
633 	chan->differential = 1;  in ad7280_total_voltage_channel_init()
634 	chan->channel = 0;  in ad7280_total_voltage_channel_init()
635 	chan->channel2 = dev * AD7280A_CELLS_PER_DEV;  in ad7280_total_voltage_channel_init()
636 	chan->address = AD7280A_ALL_CELLS;  in ad7280_total_voltage_channel_init()
637 	chan->indexed = 1;  in ad7280_total_voltage_channel_init()
638 	chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);  in ad7280_total_voltage_channel_init()
639 	chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);  in ad7280_total_voltage_channel_init()
640 	chan->scan_index = cnt;  in ad7280_total_voltage_channel_init()
641 	chan->scan_type.sign = 'u';  in ad7280_total_voltage_channel_init()
642 	chan->scan_type.realbits = 32;  in ad7280_total_voltage_channel_init()
643 	chan->scan_type.storagebits = 32;  in ad7280_total_voltage_channel_init()
653 		chan = &st->channels[*cnt];  in ad7280_init_dev_channels()
674 	st->channels = devm_kcalloc(&st->spi->dev, (st->slave_num + 1) * 12 + 1,  in ad7280_channel_init()
675 				    sizeof(*st->channels), GFP_KERNEL);  in ad7280_channel_init()
676 	if (!st->channels)  in ad7280_channel_init()
677 		return -ENOMEM;  in ad7280_channel_init()
679 	for (dev = 0; dev <= st->slave_num; dev++)  in ad7280_channel_init()
682 	ad7280_total_voltage_channel_init(&st->channels[cnt], cnt, dev);  in ad7280_channel_init()
695 	switch (chan->type) {  in ad7280a_read_thresh()
699 			*val = 1000 + (st->cell_threshhigh * 1568L) / 100;  in ad7280a_read_thresh()
702 			*val = 1000 + (st->cell_threshlow * 1568L) / 100;  in ad7280a_read_thresh()
705 			return -EINVAL;  in ad7280a_read_thresh()
711 			*val = ((st->aux_threshhigh) * 196L) / 10;  in ad7280a_read_thresh()
714 			*val = (st->aux_threshlow * 196L) / 10;  in ad7280a_read_thresh()
717 			return -EINVAL;  in ad7280a_read_thresh()
721 		return -EINVAL;  in ad7280a_read_thresh()
738 		return -EINVAL;  in ad7280a_write_thresh()
740 	mutex_lock(&st->lock);  in ad7280a_write_thresh()
741 	switch (chan->type) {  in ad7280a_write_thresh()
743 		value = ((val - 1000) * 100) / 1568; /* LSB 15.68mV */  in ad7280a_write_thresh()
752 			st->cell_threshhigh = value;  in ad7280a_write_thresh()
760 			st->cell_threshlow = value;  in ad7280a_write_thresh()
763 			ret = -EINVAL;  in ad7280a_write_thresh()
777 			st->aux_threshhigh = value;  in ad7280a_write_thresh()
785 			st->aux_threshlow = value;  in ad7280a_write_thresh()
788 			ret = -EINVAL;  in ad7280a_write_thresh()
793 		ret = -EINVAL;  in ad7280a_write_thresh()
798 	mutex_unlock(&st->lock);  in ad7280a_write_thresh()
809 	unsigned int *channels __free(kfree) = kcalloc(st->scan_cnt, sizeof(*channels),  in ad7280_event_handler()
814 	ret = ad7280_read_all_channels(st, st->scan_cnt, channels);  in ad7280_event_handler()
818 	for (i = 0; i < st->scan_cnt; i++) {  in ad7280_event_handler()
824 			if (val >= st->cell_threshhigh) {  in ad7280_event_handler()
831 			} else if (val <= st->cell_threshlow) {  in ad7280_event_handler()
840 			if (val >= st->aux_threshhigh) {  in ad7280_event_handler()
846 			} else if (val <= st->aux_threshlow) {  in ad7280_event_handler()
862 	 * Total Conversion Time = ((tACQ + tCONV) *  in ad7280_update_delay()
864 	 *			   tACQ + ((N - 1) * tDELAY)  in ad7280_update_delay()
866 	 * Readback Delay = Total Conversion Time + tWAIT  in ad7280_update_delay()
869 	st->readback_delay_us =  in ad7280_update_delay()
870 		((ad7280a_t_acq_ns[st->acquisition_time & 0x3] + 720) *  in ad7280_update_delay()
871 			(AD7280A_NUM_CH * ad7280a_n_avg[st->oversampling_ratio & 0x3])) -  in ad7280_update_delay()
872 		ad7280a_t_acq_ns[st->acquisition_time & 0x3] + st->slave_num * 250;  in ad7280_update_delay()
875 	st->readback_delay_us = DIV_ROUND_UP(st->readback_delay_us, 1000);  in ad7280_update_delay()
876 	st->readback_delay_us += 5; /* Add tWAIT */  in ad7280_update_delay()
890 		mutex_lock(&st->lock);  in ad7280_read_raw()
891 		if (chan->address == AD7280A_ALL_CELLS)  in ad7280_read_raw()
892 			ret = ad7280_read_all_channels(st, st->scan_cnt, NULL);  in ad7280_read_raw()
894 			ret = ad7280_read_channel(st, chan->address >> 8,  in ad7280_read_raw()
895 						  chan->address & 0xFF);  in ad7280_read_raw()
896 		mutex_unlock(&st->lock);  in ad7280_read_raw()
905 		if ((chan->address & 0xFF) <= AD7280A_CELL_VOLTAGE_6_REG)  in ad7280_read_raw()
913 		*val = ad7280a_n_avg[st->oversampling_ratio];  in ad7280_read_raw()
916 	return -EINVAL;  in ad7280_read_raw()
929 			return -EINVAL;  in ad7280_write_raw()
932 				st->oversampling_ratio = i;  in ad7280_write_raw()
937 		return -EINVAL;  in ad7280_write_raw()
939 		return -EINVAL;  in ad7280_write_raw()
957 	struct device *dev = &spi->dev;  in ad7280_probe()
964 		return -ENOMEM;  in ad7280_probe()
968 	st->spi = spi;  in ad7280_probe()
969 	mutex_init(&st->lock);  in ad7280_probe()
971 	st->thermistor_term_en =  in ad7280_probe()
972 		device_property_read_bool(dev, "adi,thermistor-termination");  in ad7280_probe()
974 	if (device_property_present(dev, "adi,acquisition-time-ns")) {  in ad7280_probe()
977 		ret = device_property_read_u32(dev, "adi,acquisition-time-ns", &val);  in ad7280_probe()
983 			st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_400ns;  in ad7280_probe()
986 			st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_800ns;  in ad7280_probe()
989 			st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_1200ns;  in ad7280_probe()
992 			st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_1600ns;  in ad7280_probe()
995 			dev_err(dev, "Firmware provided acquisition time is invalid\n");  in ad7280_probe()
996 			return -EINVAL;  in ad7280_probe()
999 		st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_400ns;  in ad7280_probe()
1003 	if (device_property_present(dev, "adi,voltage-alert-last-chan")) {  in ad7280_probe()
1006 		ret = device_property_read_u32(dev, "adi,voltage-alert-last-chan", &val);  in ad7280_probe()
1012 			st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_VIN4_VIN5;  in ad7280_probe()
1015 			st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_VIN5;  in ad7280_probe()
1025 	crc8_populate_msb(st->crc_tab, POLYNOM);  in ad7280_probe()
1027 	st->spi->max_speed_hz = AD7280A_MAX_SPI_CLK_HZ;  in ad7280_probe()
1028 	st->spi->mode = SPI_MODE_1;  in ad7280_probe()
1029 	spi_setup(st->spi);  in ad7280_probe()
1031 	st->ctrl_lb = FIELD_PREP(AD7280A_CTRL_LB_ACQ_TIME_MSK, st->acquisition_time) |  in ad7280_probe()
1032 		FIELD_PREP(AD7280A_CTRL_LB_THERMISTOR_MSK, st->thermistor_term_en);  in ad7280_probe()
1033 	st->oversampling_ratio = 0; /* No oversampling */  in ad7280_probe()
1039 	st->slave_num = ret;  in ad7280_probe()
1040 	st->scan_cnt = (st->slave_num + 1) * AD7280A_NUM_CH;  in ad7280_probe()
1041 	st->cell_threshhigh = 0xFF;  in ad7280_probe()
1042 	st->aux_threshhigh = 0xFF;  in ad7280_probe()
1050 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7280_probe()
1051 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7280_probe()
1053 	ret = ad7280_channel_init(st, spi->irq > 0);  in ad7280_probe()
1057 	indio_dev->num_channels = ret;  in ad7280_probe()
1058 	indio_dev->channels = st->channels;  in ad7280_probe()
1059 	if (spi->irq > 0) {  in ad7280_probe()
1066 		ret = ad7280_write(st, ad7280a_devaddr(st->slave_num),  in ad7280_probe()
1070 					      st->chain_last_alert_ignore));  in ad7280_probe()
1074 		ret = devm_request_threaded_irq(dev, spi->irq,  in ad7280_probe()
1079 						indio_dev->name,  in ad7280_probe()
1084 		indio_dev->info = &ad7280_info;  in ad7280_probe()
1086 		indio_dev->info = &ad7280_info_no_irq;  in ad7280_probe()