2  * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
29 #include <dt-bindings/iio/qcom,spmi-vadc.h>
31 #include "qcom-vadc-common.h"
84  * struct vadc_channel_prop - VADC channel property.
88  * @prescale: channel scaling performed on the input signal.
93  * @scale_fn_type: Represents the scaling function to convert voltage
107  * struct vadc_priv - VADC private structure.
147 	return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);  in vadc_read()
152 	return regmap_write(vadc->regmap, vadc->base + offset, data);  in vadc_write()
211 	dev_err(vadc->dev,  in vadc_show_status()
230 	ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);  in vadc_configure()
235 	decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;  in vadc_configure()
241 	ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);  in vadc_configure()
245 	ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);  in vadc_configure()
249 	if (prop->avg_samples)  in vadc_configure()
279 	return -ETIMEDOUT;  in vadc_poll_wait_eoc()
286 	ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);  in vadc_read_result()
300 	for (i = 0; i < vadc->nchannels; i++)  in vadc_get_channel()
301 		if (vadc->chan_props[i].channel == num)  in vadc_get_channel()
302 			return &vadc->chan_props[i];  in vadc_get_channel()
304 	dev_dbg(vadc->dev, "no such channel %02x\n", num);  in vadc_get_channel()
315 	mutex_lock(&vadc->lock);  in vadc_do_conversion()
321 	if (!vadc->poll_eoc)  in vadc_do_conversion()
322 		reinit_completion(&vadc->complete);  in vadc_do_conversion()
332 	timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;  in vadc_do_conversion()
334 	if (vadc->poll_eoc) {  in vadc_do_conversion()
337 		ret = wait_for_completion_timeout(&vadc->complete, timeout);  in vadc_do_conversion()
339 			ret = -ETIMEDOUT;  in vadc_do_conversion()
354 		dev_err(vadc->dev, "conversion failed\n");  in vadc_do_conversion()
356 	mutex_unlock(&vadc->lock);  in vadc_do_conversion()
366 	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;  in vadc_measure_ref_points()
367 	vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;  in vadc_measure_ref_points()
384 		ret = -EINVAL;  in vadc_measure_ref_points()
388 	vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;  in vadc_measure_ref_points()
389 	vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;  in vadc_measure_ref_points()
403 		ret = -EINVAL;  in vadc_measure_ref_points()
407 	vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;  in vadc_measure_ref_points()
408 	vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;  in vadc_measure_ref_points()
411 		dev_err(vadc->dev, "measure reference points failed\n");  in vadc_measure_ref_points()
418 	unsigned int pre;  in vadc_prescaling_from_dt()  local
420 	for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)  in vadc_prescaling_from_dt()
421 		if (vadc_prescale_ratios[pre].num == num &&  in vadc_prescaling_from_dt()
422 		    vadc_prescale_ratios[pre].den == den)  in vadc_prescaling_from_dt()
425 	if (pre == ARRAY_SIZE(vadc_prescale_ratios))  in vadc_prescaling_from_dt()
426 		return -EINVAL;  in vadc_prescaling_from_dt()
428 	return pre;  in vadc_prescaling_from_dt()
434 		return -EINVAL;  in vadc_hw_settle_time_from_dt()
447 		return -EINVAL;  in vadc_avg_samples_from_dt()
463 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
468 		ret = qcom_vadc_scale(prop->scale_fn_type,  in vadc_read_raw()
469 				&vadc->graph[prop->calibration],  in vadc_read_raw()
470 				&vadc_prescale_ratios[prop->prescale],  in vadc_read_raw()
471 				(prop->calibration == VADC_CALIB_ABSOLUTE),  in vadc_read_raw()
478 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
486 		ret = -EINVAL;  in vadc_read_raw()
499 	for (i = 0; i < vadc->nchannels; i++)  in vadc_of_xlate()
500 		if (vadc->iio_chans[i].channel == iiospec->args[0])  in vadc_of_xlate()
503 	return -EINVAL;  in vadc_of_xlate()
663 	const char *name = node->name;  in vadc_get_dt_channel_data()
675 		return -EINVAL;  in vadc_get_dt_channel_data()
679 	prop->channel = chan;  in vadc_get_dt_channel_data()
689 		prop->decimation = ret;  in vadc_get_dt_channel_data()
691 		prop->decimation = VADC_DEF_DECIMATION;  in vadc_get_dt_channel_data()
694 	ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);  in vadc_get_dt_channel_data()
698 			dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",  in vadc_get_dt_channel_data()
702 		prop->prescale = ret;  in vadc_get_dt_channel_data()
704 		prop->prescale = vadc_chans[prop->channel].prescale_index;  in vadc_get_dt_channel_data()
707 	ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);  in vadc_get_dt_channel_data()
711 			dev_err(dev, "%02x invalid hw-settle-time %d us\n",  in vadc_get_dt_channel_data()
715 		prop->hw_settle_time = ret;  in vadc_get_dt_channel_data()
717 		prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;  in vadc_get_dt_channel_data()
720 	ret = of_property_read_u32(node, "qcom,avg-samples", &value);  in vadc_get_dt_channel_data()
724 			dev_err(dev, "%02x invalid avg-samples %d\n",  in vadc_get_dt_channel_data()
728 		prop->avg_samples = ret;  in vadc_get_dt_channel_data()
730 		prop->avg_samples = VADC_DEF_AVG_SAMPLES;  in vadc_get_dt_channel_data()
734 		prop->calibration = VADC_CALIB_RATIOMETRIC;  in vadc_get_dt_channel_data()
736 		prop->calibration = VADC_CALIB_ABSOLUTE;  in vadc_get_dt_channel_data()
752 	vadc->nchannels = of_get_available_child_count(node);  in vadc_get_dt_data()
753 	if (!vadc->nchannels)  in vadc_get_dt_data()
754 		return -EINVAL;  in vadc_get_dt_data()
756 	vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_dt_data()
757 				       sizeof(*vadc->iio_chans), GFP_KERNEL);  in vadc_get_dt_data()
758 	if (!vadc->iio_chans)  in vadc_get_dt_data()
759 		return -ENOMEM;  in vadc_get_dt_data()
761 	vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_dt_data()
762 					sizeof(*vadc->chan_props), GFP_KERNEL);  in vadc_get_dt_data()
763 	if (!vadc->chan_props)  in vadc_get_dt_data()
764 		return -ENOMEM;  in vadc_get_dt_data()
766 	iio_chan = vadc->iio_chans;  in vadc_get_dt_data()
769 		ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);  in vadc_get_dt_data()
776 		vadc->chan_props[index] = prop;  in vadc_get_dt_data()
780 		iio_chan->channel = prop.channel;  in vadc_get_dt_data()
781 		iio_chan->datasheet_name = vadc_chan->datasheet_name;  in vadc_get_dt_data()
782 		iio_chan->info_mask_separate = vadc_chan->info_mask;  in vadc_get_dt_data()
783 		iio_chan->type = vadc_chan->type;  in vadc_get_dt_data()
784 		iio_chan->indexed = 1;  in vadc_get_dt_data()
785 		iio_chan->address = index++;  in vadc_get_dt_data()
792 		dev_err(vadc->dev, "Please define 1.25V channel\n");  in vadc_get_dt_data()
793 		return -ENODEV;  in vadc_get_dt_data()
797 		dev_err(vadc->dev, "Please define 0.625V channel\n");  in vadc_get_dt_data()
798 		return -ENODEV;  in vadc_get_dt_data()
802 		dev_err(vadc->dev, "Please define VDD channel\n");  in vadc_get_dt_data()
803 		return -ENODEV;  in vadc_get_dt_data()
807 		dev_err(vadc->dev, "Please define GND channel\n");  in vadc_get_dt_data()
808 		return -ENODEV;  in vadc_get_dt_data()
818 	complete(&vadc->complete);  in vadc_isr()
833 		dev_err(vadc->dev, "%d is not ADC\n", val);  in vadc_check_revision()
834 		return -ENODEV;  in vadc_check_revision()
842 		dev_err(vadc->dev, "%d is not VADC\n", val);  in vadc_check_revision()
843 		return -ENODEV;  in vadc_check_revision()
851 		dev_err(vadc->dev, "revision %d not supported\n", val);  in vadc_check_revision()
852 		return -ENODEV;  in vadc_check_revision()
860 	struct device_node *node = pdev->dev.of_node;  in vadc_probe()
861 	struct device *dev = &pdev->dev;  in vadc_probe()
868 	regmap = dev_get_regmap(dev->parent, NULL);  in vadc_probe()
870 		return -ENODEV;  in vadc_probe()
878 		return -ENOMEM;  in vadc_probe()
881 	vadc->regmap = regmap;  in vadc_probe()
882 	vadc->dev = dev;  in vadc_probe()
883 	vadc->base = reg;  in vadc_probe()
884 	vadc->are_ref_measured = false;  in vadc_probe()
885 	init_completion(&vadc->complete);  in vadc_probe()
886 	mutex_init(&vadc->lock);  in vadc_probe()
898 		if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)  in vadc_probe()
900 		vadc->poll_eoc = true;  in vadc_probe()
903 				       "spmi-vadc", vadc);  in vadc_probe()
918 	indio_dev->dev.parent = dev;  in vadc_probe()
919 	indio_dev->dev.of_node = node;  in vadc_probe()
920 	indio_dev->name = pdev->name;  in vadc_probe()
921 	indio_dev->modes = INDIO_DIRECT_MODE;  in vadc_probe()
922 	indio_dev->info = &vadc_info;  in vadc_probe()
923 	indio_dev->channels = vadc->iio_chans;  in vadc_probe()
924 	indio_dev->num_channels = vadc->nchannels;  in vadc_probe()
930 	{ .compatible = "qcom,spmi-vadc" },
937 		   .name = "qcom-spmi-vadc",
944 MODULE_ALIAS("platform:qcom-spmi-vadc");
947 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
948 MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");