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>
22 #include <dt-bindings/iio/qcom,spmi-vadc.h>
24 /* VADC register and bit definitions */
75  * struct vadc_channel_prop - VADC channel property.
98  * struct vadc_priv - VADC private structure.
102  * @nchannels: number of VADC channels.
103  * @chan_props: array of VADC channel properties.
107  * @complete: VADC result notification after interrupt is received.
136 static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)  in vadc_read()  argument
138 	return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);  in vadc_read()
141 static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)  in vadc_write()  argument
143 	return regmap_write(vadc->regmap, vadc->base + offset, data);  in vadc_write()
146 static int vadc_reset(struct vadc_priv *vadc)  in vadc_reset()  argument
151 	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);  in vadc_reset()
155 	ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);  in vadc_reset()
159 	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);  in vadc_reset()
165 	return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);  in vadc_reset()
168 static int vadc_set_state(struct vadc_priv *vadc, bool state)  in vadc_set_state()  argument
170 	return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);  in vadc_set_state()
173 static void vadc_show_status(struct vadc_priv *vadc)  in vadc_show_status()  argument
178 	ret = vadc_read(vadc, VADC_MODE_CTL, &mode);  in vadc_show_status()
182 	ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);  in vadc_show_status()
186 	ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);  in vadc_show_status()
190 	ret = vadc_read(vadc, VADC_CONV_REQ, &req);  in vadc_show_status()
194 	ret = vadc_read(vadc, VADC_STATUS1, &sta1);  in vadc_show_status()
198 	ret = vadc_read(vadc, VADC_EN_CTL1, &en);  in vadc_show_status()
202 	dev_err(vadc->dev,  in vadc_show_status()
207 static int vadc_configure(struct vadc_priv *vadc,  in vadc_configure()  argument
216 	ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);  in vadc_configure()
221 	ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);  in vadc_configure()
226 	decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;  in vadc_configure()
227 	ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);  in vadc_configure()
232 	ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);  in vadc_configure()
236 	ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);  in vadc_configure()
240 	if (prop->avg_samples)  in vadc_configure()
241 		ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);  in vadc_configure()
243 		ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);  in vadc_configure()
248 static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)  in vadc_poll_wait_eoc()  argument
257 		ret = vadc_read(vadc, VADC_STATUS1, &sta1);  in vadc_poll_wait_eoc()
268 	vadc_show_status(vadc);  in vadc_poll_wait_eoc()
270 	return -ETIMEDOUT;  in vadc_poll_wait_eoc()
273 static int vadc_read_result(struct vadc_priv *vadc, u16 *data)  in vadc_read_result()  argument
277 	ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);  in vadc_read_result()
286 static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,  in vadc_get_channel()  argument
291 	for (i = 0; i < vadc->nchannels; i++)  in vadc_get_channel()
292 		if (vadc->chan_props[i].channel == num)  in vadc_get_channel()
293 			return &vadc->chan_props[i];  in vadc_get_channel()
295 	dev_dbg(vadc->dev, "no such channel %02x\n", num);  in vadc_get_channel()
300 static int vadc_do_conversion(struct vadc_priv *vadc,  in vadc_do_conversion()  argument
306 	mutex_lock(&vadc->lock);  in vadc_do_conversion()
308 	ret = vadc_configure(vadc, prop);  in vadc_do_conversion()
312 	if (!vadc->poll_eoc)  in vadc_do_conversion()
313 		reinit_completion(&vadc->complete);  in vadc_do_conversion()
315 	ret = vadc_set_state(vadc, true);  in vadc_do_conversion()
319 	ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);  in vadc_do_conversion()
323 	timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;  in vadc_do_conversion()
325 	if (vadc->poll_eoc) {  in vadc_do_conversion()
326 		ret = vadc_poll_wait_eoc(vadc, timeout);  in vadc_do_conversion()
328 		ret = wait_for_completion_timeout(&vadc->complete, timeout);  in vadc_do_conversion()
330 			ret = -ETIMEDOUT;  in vadc_do_conversion()
335 		ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);  in vadc_do_conversion()
340 	ret = vadc_read_result(vadc, data);  in vadc_do_conversion()
343 	vadc_set_state(vadc, false);  in vadc_do_conversion()
345 		dev_err(vadc->dev, "conversion failed\n");  in vadc_do_conversion()
347 	mutex_unlock(&vadc->lock);  in vadc_do_conversion()
351 static int vadc_measure_ref_points(struct vadc_priv *vadc)  in vadc_measure_ref_points()  argument
357 	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;  in vadc_measure_ref_points()
358 	vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;  in vadc_measure_ref_points()
360 	prop = vadc_get_channel(vadc, VADC_REF_1250MV);  in vadc_measure_ref_points()
361 	ret = vadc_do_conversion(vadc, prop, &read_1);  in vadc_measure_ref_points()
366 	prop = vadc_get_channel(vadc, VADC_SPARE1);  in vadc_measure_ref_points()
368 		prop = vadc_get_channel(vadc, VADC_REF_625MV);  in vadc_measure_ref_points()
370 	ret = vadc_do_conversion(vadc, prop, &read_2);  in vadc_measure_ref_points()
375 		ret = -EINVAL;  in vadc_measure_ref_points()
379 	vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;  in vadc_measure_ref_points()
380 	vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;  in vadc_measure_ref_points()
383 	prop = vadc_get_channel(vadc, VADC_VDD_VADC);  in vadc_measure_ref_points()
384 	ret = vadc_do_conversion(vadc, prop, &read_1);  in vadc_measure_ref_points()
388 	prop = vadc_get_channel(vadc, VADC_GND_REF);  in vadc_measure_ref_points()
389 	ret = vadc_do_conversion(vadc, prop, &read_2);  in vadc_measure_ref_points()
394 		ret = -EINVAL;  in vadc_measure_ref_points()
398 	vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;  in vadc_measure_ref_points()
399 	vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;  in vadc_measure_ref_points()
402 		dev_err(vadc->dev, "measure reference points failed\n");  in vadc_measure_ref_points()
417 		return -EINVAL;  in vadc_prescaling_from_dt()
425 		return -EINVAL;  in vadc_hw_settle_time_from_dt()
438 		return -EINVAL;  in vadc_avg_samples_from_dt()
447 	struct vadc_priv *vadc = iio_priv(indio_dev);  in vadc_read_raw()  local
454 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
455 		ret = vadc_do_conversion(vadc, prop, &adc_code);  in vadc_read_raw()
459 		ret = qcom_vadc_scale(prop->scale_fn_type,  in vadc_read_raw()
460 				&vadc->graph[prop->calibration],  in vadc_read_raw()
461 				&vadc_prescale_ratios[prop->prescale],  in vadc_read_raw()
462 				(prop->calibration == VADC_CALIB_ABSOLUTE),  in vadc_read_raw()
469 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
470 		ret = vadc_do_conversion(vadc, prop, &adc_code);  in vadc_read_raw()
477 		ret = -EINVAL;  in vadc_read_raw()
487 	struct vadc_priv *vadc = iio_priv(indio_dev);  in vadc_of_xlate()  local
490 	for (i = 0; i < vadc->nchannels; i++)  in vadc_of_xlate()
491 		if (vadc->iio_chans[i].channel == iiospec->args[0])  in vadc_of_xlate()
494 	return -EINVAL;  in vadc_of_xlate()
654 	const char *name = node->name;  in vadc_get_dt_channel_data()
666 		return -EINVAL;  in vadc_get_dt_channel_data()
670 	prop->channel = chan;  in vadc_get_dt_channel_data()
680 		prop->decimation = ret;  in vadc_get_dt_channel_data()
682 		prop->decimation = VADC_DEF_DECIMATION;  in vadc_get_dt_channel_data()
685 	ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);  in vadc_get_dt_channel_data()
689 			dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",  in vadc_get_dt_channel_data()
693 		prop->prescale = ret;  in vadc_get_dt_channel_data()
695 		prop->prescale = vadc_chans[prop->channel].prescale_index;  in vadc_get_dt_channel_data()
698 	ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);  in vadc_get_dt_channel_data()
702 			dev_err(dev, "%02x invalid hw-settle-time %d us\n",  in vadc_get_dt_channel_data()
706 		prop->hw_settle_time = ret;  in vadc_get_dt_channel_data()
708 		prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;  in vadc_get_dt_channel_data()
711 	ret = of_property_read_u32(node, "qcom,avg-samples", &value);  in vadc_get_dt_channel_data()
715 			dev_err(dev, "%02x invalid avg-samples %d\n",  in vadc_get_dt_channel_data()
719 		prop->avg_samples = ret;  in vadc_get_dt_channel_data()
721 		prop->avg_samples = VADC_DEF_AVG_SAMPLES;  in vadc_get_dt_channel_data()
725 		prop->calibration = VADC_CALIB_RATIOMETRIC;  in vadc_get_dt_channel_data()
727 		prop->calibration = VADC_CALIB_ABSOLUTE;  in vadc_get_dt_channel_data()
734 static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)  in vadc_get_dt_data()  argument
743 	vadc->nchannels = of_get_available_child_count(node);  in vadc_get_dt_data()
744 	if (!vadc->nchannels)  in vadc_get_dt_data()
745 		return -EINVAL;  in vadc_get_dt_data()
747 	vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_dt_data()
748 				       sizeof(*vadc->iio_chans), GFP_KERNEL);  in vadc_get_dt_data()
749 	if (!vadc->iio_chans)  in vadc_get_dt_data()
750 		return -ENOMEM;  in vadc_get_dt_data()
752 	vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_dt_data()
753 					sizeof(*vadc->chan_props), GFP_KERNEL);  in vadc_get_dt_data()
754 	if (!vadc->chan_props)  in vadc_get_dt_data()
755 		return -ENOMEM;  in vadc_get_dt_data()
757 	iio_chan = vadc->iio_chans;  in vadc_get_dt_data()
760 		ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);  in vadc_get_dt_data()
767 		vadc->chan_props[index] = prop;  in vadc_get_dt_data()
771 		iio_chan->channel = prop.channel;  in vadc_get_dt_data()
772 		iio_chan->datasheet_name = vadc_chan->datasheet_name;  in vadc_get_dt_data()
773 		iio_chan->info_mask_separate = vadc_chan->info_mask;  in vadc_get_dt_data()
774 		iio_chan->type = vadc_chan->type;  in vadc_get_dt_data()
775 		iio_chan->indexed = 1;  in vadc_get_dt_data()
776 		iio_chan->address = index++;  in vadc_get_dt_data()
782 	if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {  in vadc_get_dt_data()
783 		dev_err(vadc->dev, "Please define 1.25V channel\n");  in vadc_get_dt_data()
784 		return -ENODEV;  in vadc_get_dt_data()
787 	if (!vadc_get_channel(vadc, VADC_REF_625MV)) {  in vadc_get_dt_data()
788 		dev_err(vadc->dev, "Please define 0.625V channel\n");  in vadc_get_dt_data()
789 		return -ENODEV;  in vadc_get_dt_data()
792 	if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {  in vadc_get_dt_data()
793 		dev_err(vadc->dev, "Please define VDD channel\n");  in vadc_get_dt_data()
794 		return -ENODEV;  in vadc_get_dt_data()
797 	if (!vadc_get_channel(vadc, VADC_GND_REF)) {  in vadc_get_dt_data()
798 		dev_err(vadc->dev, "Please define GND channel\n");  in vadc_get_dt_data()
799 		return -ENODEV;  in vadc_get_dt_data()
807 	struct vadc_priv *vadc = dev_id;  in vadc_isr()  local
809 	complete(&vadc->complete);  in vadc_isr()
814 static int vadc_check_revision(struct vadc_priv *vadc)  in vadc_check_revision()  argument
819 	ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);  in vadc_check_revision()
824 		dev_err(vadc->dev, "%d is not ADC\n", val);  in vadc_check_revision()
825 		return -ENODEV;  in vadc_check_revision()
828 	ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);  in vadc_check_revision()
833 		dev_err(vadc->dev, "%d is not VADC\n", val);  in vadc_check_revision()
834 		return -ENODEV;  in vadc_check_revision()
837 	ret = vadc_read(vadc, VADC_REVISION2, &val);  in vadc_check_revision()
842 		dev_err(vadc->dev, "revision %d not supported\n", val);  in vadc_check_revision()
843 		return -ENODEV;  in vadc_check_revision()
851 	struct device_node *node = pdev->dev.of_node;  in vadc_probe()
852 	struct device *dev = &pdev->dev;  in vadc_probe()
854 	struct vadc_priv *vadc;  in vadc_probe()  local
859 	regmap = dev_get_regmap(dev->parent, NULL);  in vadc_probe()
861 		return -ENODEV;  in vadc_probe()
867 	indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));  in vadc_probe()
869 		return -ENOMEM;  in vadc_probe()
871 	vadc = iio_priv(indio_dev);  in vadc_probe()
872 	vadc->regmap = regmap;  in vadc_probe()
873 	vadc->dev = dev;  in vadc_probe()
874 	vadc->base = reg;  in vadc_probe()
875 	vadc->are_ref_measured = false;  in vadc_probe()
876 	init_completion(&vadc->complete);  in vadc_probe()
877 	mutex_init(&vadc->lock);  in vadc_probe()
879 	ret = vadc_check_revision(vadc);  in vadc_probe()
883 	ret = vadc_get_dt_data(vadc, node);  in vadc_probe()
889 		if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)  in vadc_probe()
891 		vadc->poll_eoc = true;  in vadc_probe()
894 				       "spmi-vadc", vadc);  in vadc_probe()
899 	ret = vadc_reset(vadc);  in vadc_probe()
905 	ret = vadc_measure_ref_points(vadc);  in vadc_probe()
909 	indio_dev->name = pdev->name;  in vadc_probe()
910 	indio_dev->modes = INDIO_DIRECT_MODE;  in vadc_probe()
911 	indio_dev->info = &vadc_info;  in vadc_probe()
912 	indio_dev->channels = vadc->iio_chans;  in vadc_probe()
913 	indio_dev->num_channels = vadc->nchannels;  in vadc_probe()
919 	{ .compatible = "qcom,spmi-vadc" },
926 		   .name = "qcom-spmi-vadc",
933 MODULE_ALIAS("platform:qcom-spmi-vadc");
934 MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
936 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
937 MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");