1 // SPDX-License-Identifier: GPL-2.0-only
103 #define AD3552R_REG_ADDR_CH_DAC_16B(ch)			(0x2C - (1 - ch) * 2)
108 #define AD3552R_REG_ADDR_CH_INPUT_16B(ch)		(0x36 - (1 - ch) * 2)
112 #define AD3552R_REG_ADDR_CH_DAC_24B(ch)			(0x3D - (1 - ch) * 3)
117 #define AD3552R_REG_ADDR_CH_INPUT_24B(ch)		(0x4B - (1 - ch) * 3)
134 	/* Internal source with Vref I/O floating */
136 	/* Internal source with Vref I/O at 2.5V */
138 	/* External source with Vref I/O as input */
154 	/* Range from -5 V to 5 V. Requires Rfb2x connection  */
156 	/* Range from -10 V to 10 V. Requires Rfb4x connection  */
164 	[AD3552R_CH_OUTPUT_RANGE_NEG_5__5V]	= {-5000, 5000},
165 	[AD3552R_CH_OUTPUT_RANGE_NEG_10__10V]	= {-10000, 10000}
177 	/* Range from -2.5 V to 7.5 V. Requires Rfb2x connection  */
179 	/* Range from -5 V to 5 V. Requires Rfb2x connection  */
188 	[AD3542R_CH_OUTPUT_RANGE_NEG_2P5__7P5V]	= {-2500, 7500},
189 	[AD3542R_CH_OUTPUT_RANGE_NEG_5__5V]	= {-5000, 5000}
212 	/* - Direct register values */
213 	/* From 0-3 */
216 	 * 0 -> Internal Vref, vref_io pin floating (default)
217 	 * 1 -> Internal Vref, vref_io driven by internal vref
218 	 * 2 or 3 -> External Vref
233 	 * Over-rider the range selector in order to manually set the output
247 	/* Channel select. When set allow Input -> DAC and Mask -> DAC */
259 	u8	p;  member
292 /* 0 -> reg addr, 1->ch0 mask, 2->ch1 mask */
348 		return spi_write_then_read(dac->spi, buf, 1, data, len);  in ad3552r_transfer()
351 	return spi_write_then_read(dac->spi, buf, len + 1, NULL, 0);  in ad3552r_transfer()
450 	u8 ch = chan->channel;  in ad3552r_read_raw()
454 		mutex_lock(&dac->lock);  in ad3552r_read_raw()
457 		mutex_unlock(&dac->lock);  in ad3552r_read_raw()
463 		mutex_lock(&dac->lock);  in ad3552r_read_raw()
466 		mutex_unlock(&dac->lock);  in ad3552r_read_raw()
473 		*val = dac->ch_data[ch].scale_int;  in ad3552r_read_raw()
474 		*val2 = dac->ch_data[ch].scale_dec;  in ad3552r_read_raw()
477 		*val = dac->ch_data[ch].offset_int;  in ad3552r_read_raw()
478 		*val2 = dac->ch_data[ch].offset_dec;  in ad3552r_read_raw()
481 		return -EINVAL;  in ad3552r_read_raw()
494 	mutex_lock(&dac->lock);  in ad3552r_write_raw()
498 					AD3552R_REG_ADDR_CH_DAC_24B(chan->channel),  in ad3552r_write_raw()
503 					   chan->channel, !val);  in ad3552r_write_raw()
506 		err = -EINVAL;  in ad3552r_write_raw()
509 	mutex_unlock(&dac->lock);  in ad3552r_write_raw()
541 	if (!dac->gpio_ldac) {  in ad3552r_write_all_channels()
550 	if (dac->gpio_ldac)  in ad3552r_write_all_channels()
551 		return ad3552r_trigger_hw_ldac(dac->gpio_ldac);  in ad3552r_write_all_channels()
576 	if (dac->gpio_ldac)  in ad3552r_write_codes()
577 		return ad3552r_trigger_hw_ldac(dac->gpio_ldac);  in ad3552r_write_codes()
582 static irqreturn_t ad3552r_trigger_handler(int irq, void *p)  in ad3552r_trigger_handler()  argument
584 	struct iio_poll_func *pf = p;  in ad3552r_trigger_handler()
585 	struct iio_dev *indio_dev = pf->indio_dev;  in ad3552r_trigger_handler()
586 	struct iio_buffer *buf = indio_dev->buffer;  in ad3552r_trigger_handler()
597 	mutex_lock(&dac->lock);  in ad3552r_trigger_handler()
598 	ad3552r_write_codes(dac, *indio_dev->active_scan_mask, buff);  in ad3552r_trigger_handler()
599 	mutex_unlock(&dac->lock);  in ad3552r_trigger_handler()
601 	iio_trigger_notify_done(indio_dev->trig);  in ad3552r_trigger_handler()
622 		return -ENODEV;  in ad3552r_check_scratch_pad()
633 		return -ENODEV;  in ad3552r_check_scratch_pad()
648 	err = ad3552r_read_reg(addr->dac, addr->addr, &val);  in ad3552r_read_reg_wrapper()
661 	dac->gpio_reset = devm_gpiod_get_optional(&dac->spi->dev, "reset",  in ad3552r_reset()
663 	if (IS_ERR(dac->gpio_reset))  in ad3552r_reset()
664 		return dev_err_probe(&dac->spi->dev, PTR_ERR(dac->gpio_reset),  in ad3552r_reset()
667 	if (dac->gpio_reset) {  in ad3552r_reset()
670 		gpiod_set_value_cansleep(dac->gpio_reset, 1);  in ad3552r_reset()
691 		dev_err(&dac->spi->dev, "Error while resetting");  in ad3552r_reset()
702 		dev_err(&dac->spi->dev, "Error while resetting");  in ad3552r_reset()
715 	s64 vref, tmp, common, offset, gn, gp;  in ad3552r_get_custom_range()  local
719 	 *	Vmax = 2.5 - [(GainP + Offset / 1024) * 2.5 * Rfb * 1.03]  in ad3552r_get_custom_range()
722 	vref = 2500;  in ad3552r_get_custom_range()
724 	common = 2575 * dac->ch_data[i].rfb;  in ad3552r_get_custom_range()
725 	offset = dac->ch_data[i].gain_offset;  in ad3552r_get_custom_range()
727 	gn = gains_scaling_table[dac->ch_data[i].n];  in ad3552r_get_custom_range()
730 	*v_max = vref + tmp;  in ad3552r_get_custom_range()
732 	gp = gains_scaling_table[dac->ch_data[i].p];  in ad3552r_get_custom_range()
733 	tmp = (1024 * gp - AD3552R_GAIN_SCALE * offset) * common;  in ad3552r_get_custom_range()
735 	*v_min = vref - tmp;  in ad3552r_get_custom_range()
743 	if (dac->ch_data[ch].range_override) {  in ad3552r_calc_gain_and_offset()
747 		idx = dac->ch_data[ch].range;  in ad3552r_calc_gain_and_offset()
748 		if (dac->chip_id == AD3542R_ID) {  in ad3552r_calc_gain_and_offset()
767 	span = v_max - v_min;  in ad3552r_calc_gain_and_offset()
768 	dac->ch_data[ch].scale_int = div_s64_rem(span, 65536, &rem);  in ad3552r_calc_gain_and_offset()
770 	dac->ch_data[ch].scale_dec = DIV_ROUND_CLOSEST((s64)rem * 1000000,  in ad3552r_calc_gain_and_offset()
773 	dac->ch_data[ch].offset_int = div_s64_rem(v_min * 65536, span, &rem);  in ad3552r_calc_gain_and_offset()
775 	dac->ch_data[ch].offset_dec = div_s64(tmp, span);  in ad3552r_calc_gain_and_offset()
796 	return -EINVAL;  in ad3552r_find_range()
803 	struct device *dev = &dac->spi->dev;  in ad3552r_configure_custom_gain()
811 						 "custom-output-range-config");  in ad3552r_configure_custom_gain()
814 			"mandatory custom-output-range-config property missing\n");  in ad3552r_configure_custom_gain()
815 		return -EINVAL;  in ad3552r_configure_custom_gain()
818 	dac->ch_data[ch].range_override = 1;  in ad3552r_configure_custom_gain()
821 	err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-p", &val);  in ad3552r_configure_custom_gain()
823 		dev_err(dev, "mandatory adi,gain-scaling-p property missing\n");  in ad3552r_configure_custom_gain()
827 	dac->ch_data[ch].p = val;  in ad3552r_configure_custom_gain()
829 	err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-n", &val);  in ad3552r_configure_custom_gain()
831 		dev_err(dev, "mandatory adi,gain-scaling-n property missing\n");  in ad3552r_configure_custom_gain()
835 	dac->ch_data[ch].n = val;  in ad3552r_configure_custom_gain()
837 	err = fwnode_property_read_u32(gain_child, "adi,rfb-ohms", &val);  in ad3552r_configure_custom_gain()
839 		dev_err(dev, "mandatory adi,rfb-ohms property missing\n");  in ad3552r_configure_custom_gain()
842 	dac->ch_data[ch].rfb = val;  in ad3552r_configure_custom_gain()
844 	err = fwnode_property_read_u32(gain_child, "adi,gain-offset", &val);  in ad3552r_configure_custom_gain()
846 		dev_err(dev, "mandatory adi,gain-offset property missing\n");  in ad3552r_configure_custom_gain()
849 	dac->ch_data[ch].gain_offset = val;  in ad3552r_configure_custom_gain()
882 	struct device *dev = &dac->spi->dev;  in ad3552r_configure_device()
884 	struct regulator *vref;  in ad3552r_configure_device()  local
888 	dac->gpio_ldac = devm_gpiod_get_optional(dev, "ldac", GPIOD_OUT_HIGH);  in ad3552r_configure_device()
889 	if (IS_ERR(dac->gpio_ldac))  in ad3552r_configure_device()
890 		return dev_err_probe(dev, PTR_ERR(dac->gpio_ldac),  in ad3552r_configure_device()
893 	vref = devm_regulator_get_optional(dev, "vref");  in ad3552r_configure_device()
894 	if (IS_ERR(vref)) {  in ad3552r_configure_device()
895 		if (PTR_ERR(vref) != -ENODEV)  in ad3552r_configure_device()
896 			return dev_err_probe(dev, PTR_ERR(vref),  in ad3552r_configure_device()
897 					     "Error getting vref");  in ad3552r_configure_device()
899 		if (device_property_read_bool(dev, "adi,vref-out-en"))  in ad3552r_configure_device()
904 		err = regulator_enable(vref);  in ad3552r_configure_device()
906 			dev_err(dev, "Failed to enable external vref supply\n");  in ad3552r_configure_device()
910 		err = devm_add_action_or_reset(dev, ad3552r_reg_disable, vref);  in ad3552r_configure_device()
912 			regulator_disable(vref);  in ad3552r_configure_device()
916 		voltage = regulator_get_voltage(vref);  in ad3552r_configure_device()
917 		if (voltage > 2500000 + delta || voltage < 2500000 - delta) {  in ad3552r_configure_device()
918 			dev_warn(dev, "vref-supply must be 2.5V");  in ad3552r_configure_device()
919 			return -EINVAL;  in ad3552r_configure_device()
931 	err = device_property_read_u32(dev, "adi,sdo-drive-strength", &val);  in ad3552r_configure_device()
934 			dev_err(dev, "adi,sdo-drive-strength must be less than 4\n");  in ad3552r_configure_device()
935 			return -EINVAL;  in ad3552r_configure_device()
946 	dac->num_ch = device_get_child_node_count(dev);  in ad3552r_configure_device()
947 	if (!dac->num_ch) {  in ad3552r_configure_device()
949 		return -ENODEV;  in ad3552r_configure_device()
961 			err = -EINVAL;  in ad3552r_configure_device()
965 		if (fwnode_property_present(child, "adi,output-range-microvolt")) {  in ad3552r_configure_device()
967 							     "adi,output-range-microvolt",  in ad3552r_configure_device()
972 					"adi,output-range-microvolt property could not be parsed\n");  in ad3552r_configure_device()
976 			err = ad3552r_find_range(dac->chip_id, vals);  in ad3552r_configure_device()
979 					"Invalid adi,output-range-microvolt value\n");  in ad3552r_configure_device()
989 			dac->ch_data[ch].range = val;  in ad3552r_configure_device()
990 		} else if (dac->chip_id == AD3542R_ID) {  in ad3552r_configure_device()
992 				"adi,output-range-microvolt is required for ad3542r\n");  in ad3552r_configure_device()
993 			err = -EINVAL;  in ad3552r_configure_device()
1002 		dac->enabled_ch |= BIT(ch);  in ad3552r_configure_device()
1008 		dac->channels[cnt] = AD3552R_CH_DAC(ch);  in ad3552r_configure_device()
1014 	for_each_clear_bit(ch, &dac->enabled_ch, AD3552R_NUM_CH) {  in ad3552r_configure_device()
1021 	dac->num_ch = cnt;  in ad3552r_configure_device()
1037 		dev_err(&dac->spi->dev, "Reset failed\n");  in ad3552r_init()
1043 		dev_err(&dac->spi->dev, "Scratch pad test failed\n");  in ad3552r_init()
1049 		dev_err(&dac->spi->dev, "Fail read PRODUCT_ID_L\n");  in ad3552r_init()
1056 		dev_err(&dac->spi->dev, "Fail read PRODUCT_ID_H\n");  in ad3552r_init()
1061 	if (id != dac->chip_id) {  in ad3552r_init()
1062 		dev_err(&dac->spi->dev, "Product id not matching\n");  in ad3552r_init()
1063 		return -ENODEV;  in ad3552r_init()
1076 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*dac));  in ad3552r_probe()
1078 		return -ENOMEM;  in ad3552r_probe()
1081 	dac->spi = spi;  in ad3552r_probe()
1082 	dac->chip_id = id->driver_data;  in ad3552r_probe()
1084 	mutex_init(&dac->lock);  in ad3552r_probe()
1091 	if (dac->chip_id == AD3552R_ID)  in ad3552r_probe()
1092 		indio_dev->name = "ad3552r";  in ad3552r_probe()
1094 		indio_dev->name = "ad3542r";  in ad3552r_probe()
1095 	indio_dev->dev.parent = &spi->dev;  in ad3552r_probe()
1096 	indio_dev->info = &ad3552r_iio_info;  in ad3552r_probe()
1097 	indio_dev->num_channels = dac->num_ch;  in ad3552r_probe()
1098 	indio_dev->channels = dac->channels;  in ad3552r_probe()
1099 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad3552r_probe()
1101 	err = devm_iio_triggered_buffer_setup_ext(&indio_dev->dev, indio_dev, NULL,  in ad3552r_probe()
1109 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad3552r_probe()