1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
10 #include <linux/iio/adc/qcom-vadc-common.h>
23 #include <dt-bindings/iio/qcom,spmi-vadc.h>
76  * struct vadc_channel_prop - VADC channel property.
78  * @calibration: calibration type.
91 	enum vadc_calibration calibration;  member
101  * struct vadc_priv - VADC private structure.
111  * @graph: store parameters for calibration.
141 	return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);  in vadc_read()
146 	return regmap_write(vadc->regmap, vadc->base + offset, data);  in vadc_write()
205 	dev_err(vadc->dev,  in vadc_show_status()
224 	ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);  in vadc_configure()
229 	decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;  in vadc_configure()
235 	ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);  in vadc_configure()
239 	ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);  in vadc_configure()
243 	if (prop->avg_samples)  in vadc_configure()
273 	return -ETIMEDOUT;  in vadc_poll_wait_eoc()
280 	ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);  in vadc_read_result()
294 	for (i = 0; i < vadc->nchannels; i++)  in vadc_get_channel()
295 		if (vadc->chan_props[i].channel == num)  in vadc_get_channel()
296 			return &vadc->chan_props[i];  in vadc_get_channel()
298 	dev_dbg(vadc->dev, "no such channel %02x\n", num);  in vadc_get_channel()
309 	mutex_lock(&vadc->lock);  in vadc_do_conversion()
315 	if (!vadc->poll_eoc)  in vadc_do_conversion()
316 		reinit_completion(&vadc->complete);  in vadc_do_conversion()
326 	timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;  in vadc_do_conversion()
328 	if (vadc->poll_eoc) {  in vadc_do_conversion()
331 		ret = wait_for_completion_timeout(&vadc->complete, timeout);  in vadc_do_conversion()
333 			ret = -ETIMEDOUT;  in vadc_do_conversion()
348 		dev_err(vadc->dev, "conversion failed\n");  in vadc_do_conversion()
350 	mutex_unlock(&vadc->lock);  in vadc_do_conversion()
360 	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;  in vadc_measure_ref_points()
361 	vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;  in vadc_measure_ref_points()
378 		ret = -EINVAL;  in vadc_measure_ref_points()
382 	vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;  in vadc_measure_ref_points()
383 	vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;  in vadc_measure_ref_points()
385 	/* Ratiometric calibration */  in vadc_measure_ref_points()
397 		ret = -EINVAL;  in vadc_measure_ref_points()
401 	vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;  in vadc_measure_ref_points()
402 	vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;  in vadc_measure_ref_points()
405 		dev_err(vadc->dev, "measure reference points failed\n");  in vadc_measure_ref_points()
412 	unsigned int pre;  in vadc_prescaling_from_dt()  local
414 	for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)  in vadc_prescaling_from_dt()
415 		if (vadc_prescale_ratios[pre].numerator == numerator &&  in vadc_prescaling_from_dt()
416 		    vadc_prescale_ratios[pre].denominator == denominator)  in vadc_prescaling_from_dt()
419 	if (pre == ARRAY_SIZE(vadc_prescale_ratios))  in vadc_prescaling_from_dt()
420 		return -EINVAL;  in vadc_prescaling_from_dt()
422 	return pre;  in vadc_prescaling_from_dt()
428 		return -EINVAL;  in vadc_hw_settle_time_from_dt()
441 		return -EINVAL;  in vadc_avg_samples_from_dt()
457 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
462 		ret = qcom_vadc_scale(prop->scale_fn_type,  in vadc_read_raw()
463 				&vadc->graph[prop->calibration],  in vadc_read_raw()
464 				&vadc_prescale_ratios[prop->prescale],  in vadc_read_raw()
465 				(prop->calibration == VADC_CALIB_ABSOLUTE),  in vadc_read_raw()
472 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
480 		ret = -EINVAL;  in vadc_read_raw()
493 	for (i = 0; i < vadc->nchannels; i++)  in vadc_fwnode_xlate()
494 		if (vadc->iio_chans[i].channel == iiospec->args[0])  in vadc_fwnode_xlate()
497 	return -EINVAL;  in vadc_fwnode_xlate()
504 	const char *name = vadc->chan_props[chan->address].channel_name;  in vadc_read_label()
679 		return -EINVAL;  in vadc_get_fw_channel_data()
685 	prop->channel_name = label;  in vadc_get_fw_channel_data()
688 	prop->channel = chan;  in vadc_get_fw_channel_data()
698 		prop->decimation = ret;  in vadc_get_fw_channel_data()
700 		prop->decimation = VADC_DEF_DECIMATION;  in vadc_get_fw_channel_data()
703 	ret = fwnode_property_read_u32_array(fwnode, "qcom,pre-scaling", varr, 2);  in vadc_get_fw_channel_data()
707 			dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",  in vadc_get_fw_channel_data()
711 		prop->prescale = ret;  in vadc_get_fw_channel_data()
713 		prop->prescale = vadc_chans[prop->channel].prescale_index;  in vadc_get_fw_channel_data()
716 	ret = fwnode_property_read_u32(fwnode, "qcom,hw-settle-time", &value);  in vadc_get_fw_channel_data()
720 			dev_err(dev, "%02x invalid hw-settle-time %d us\n",  in vadc_get_fw_channel_data()
724 		prop->hw_settle_time = ret;  in vadc_get_fw_channel_data()
726 		prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;  in vadc_get_fw_channel_data()
729 	ret = fwnode_property_read_u32(fwnode, "qcom,avg-samples", &value);  in vadc_get_fw_channel_data()
733 			dev_err(dev, "%02x invalid avg-samples %d\n",  in vadc_get_fw_channel_data()
737 		prop->avg_samples = ret;  in vadc_get_fw_channel_data()
739 		prop->avg_samples = VADC_DEF_AVG_SAMPLES;  in vadc_get_fw_channel_data()
743 		prop->calibration = VADC_CALIB_RATIOMETRIC;  in vadc_get_fw_channel_data()
745 		prop->calibration = VADC_CALIB_ABSOLUTE;  in vadc_get_fw_channel_data()
760 	vadc->nchannels = device_get_child_node_count(vadc->dev);  in vadc_get_fw_data()
761 	if (!vadc->nchannels)  in vadc_get_fw_data()
762 		return -EINVAL;  in vadc_get_fw_data()
764 	vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_fw_data()
765 				       sizeof(*vadc->iio_chans), GFP_KERNEL);  in vadc_get_fw_data()
766 	if (!vadc->iio_chans)  in vadc_get_fw_data()
767 		return -ENOMEM;  in vadc_get_fw_data()
769 	vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_fw_data()
770 					sizeof(*vadc->chan_props), GFP_KERNEL);  in vadc_get_fw_data()
771 	if (!vadc->chan_props)  in vadc_get_fw_data()
772 		return -ENOMEM;  in vadc_get_fw_data()
774 	iio_chan = vadc->iio_chans;  in vadc_get_fw_data()
776 	device_for_each_child_node_scoped(vadc->dev, child) {  in vadc_get_fw_data()
777 		ret = vadc_get_fw_channel_data(vadc->dev, &prop, child);  in vadc_get_fw_data()
782 		vadc->chan_props[index] = prop;  in vadc_get_fw_data()
786 		iio_chan->channel = prop.channel;  in vadc_get_fw_data()
787 		iio_chan->datasheet_name = vadc_chan->datasheet_name;  in vadc_get_fw_data()
788 		iio_chan->info_mask_separate = vadc_chan->info_mask;  in vadc_get_fw_data()
789 		iio_chan->type = vadc_chan->type;  in vadc_get_fw_data()
790 		iio_chan->indexed = 1;  in vadc_get_fw_data()
791 		iio_chan->address = index++;  in vadc_get_fw_data()
798 		dev_err(vadc->dev, "Please define 1.25V channel\n");  in vadc_get_fw_data()
799 		return -ENODEV;  in vadc_get_fw_data()
803 		dev_err(vadc->dev, "Please define 0.625V channel\n");  in vadc_get_fw_data()
804 		return -ENODEV;  in vadc_get_fw_data()
808 		dev_err(vadc->dev, "Please define VDD channel\n");  in vadc_get_fw_data()
809 		return -ENODEV;  in vadc_get_fw_data()
813 		dev_err(vadc->dev, "Please define GND channel\n");  in vadc_get_fw_data()
814 		return -ENODEV;  in vadc_get_fw_data()
824 	complete(&vadc->complete);  in vadc_isr()
839 		dev_err(vadc->dev, "%d is not ADC\n", val);  in vadc_check_revision()
840 		return -ENODEV;  in vadc_check_revision()
848 		dev_err(vadc->dev, "%d is not VADC\n", val);  in vadc_check_revision()
849 		return -ENODEV;  in vadc_check_revision()
857 		dev_err(vadc->dev, "revision %d not supported\n", val);  in vadc_check_revision()
858 		return -ENODEV;  in vadc_check_revision()
866 	struct device *dev = &pdev->dev;  in vadc_probe()
873 	regmap = dev_get_regmap(dev->parent, NULL);  in vadc_probe()
875 		return -ENODEV;  in vadc_probe()
883 		return -ENOMEM;  in vadc_probe()
886 	vadc->regmap = regmap;  in vadc_probe()
887 	vadc->dev = dev;  in vadc_probe()
888 	vadc->base = reg;  in vadc_probe()
889 	vadc->are_ref_measured = false;  in vadc_probe()
890 	init_completion(&vadc->complete);  in vadc_probe()
891 	mutex_init(&vadc->lock);  in vadc_probe()
903 		if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)  in vadc_probe()
905 		vadc->poll_eoc = true;  in vadc_probe()
908 				       "spmi-vadc", vadc);  in vadc_probe()
923 	indio_dev->name = pdev->name;  in vadc_probe()
924 	indio_dev->modes = INDIO_DIRECT_MODE;  in vadc_probe()
925 	indio_dev->info = &vadc_info;  in vadc_probe()
926 	indio_dev->channels = vadc->iio_chans;  in vadc_probe()
927 	indio_dev->num_channels = vadc->nchannels;  in vadc_probe()
933 	{ .compatible = "qcom,spmi-vadc" },
940 		   .name = "qcom-spmi-vadc",
947 MODULE_ALIAS("platform:qcom-spmi-vadc");
950 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
951 MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");