iio/adc/qcom-pm8xxx-xoadc.c

7  * specific-purpose and general purpose ADC converters and channels.
28  * Qualcomm tree. Their kernel has two out-of-tree drivers for the ADC:
30  * drivers/hwmon/pm8xxx-adc.c
58 /* Proper ADC registers */
100  * On a later ADC the decimation factors are defined as
168  * ADC code to the value that IIO expects, in uV or millicelsius
308  * include/linux/mfd/pm8xxx/pm8xxx-adc.h
370  * struct pm8xxx_chan_info - ADC channel information
418 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_eoc_irq()  local
420 	complete(&adc->complete);  in pm8xxx_eoc_irq()
426 pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)  in pm8xxx_get_channel()  argument
430 	for (i = 0; i < adc->nchans; i++) {  in pm8xxx_get_channel()
431 		struct pm8xxx_chan_info *ch = &adc->chans[i];  in pm8xxx_get_channel()
438 static int pm8xxx_read_channel_rsv(struct pm8xxx_xoadc *adc,  in pm8xxx_read_channel_rsv()  argument
448 	dev_dbg(adc->dev, "read channel \"%s\", amux %d, prescale/mux: %d, rsv %d\n",  in pm8xxx_read_channel_rsv()
451 	mutex_lock(&adc->lock);  in pm8xxx_read_channel_rsv()
456 	ret = regmap_write(adc->map, ADC_ARB_USRP_AMUX_CNTRL, val);  in pm8xxx_read_channel_rsv()
463 	if (adc->variant->broken_ratiometric && !force_ratiometric) {  in pm8xxx_read_channel_rsv()
493 	ret = regmap_update_bits(adc->map,  in pm8xxx_read_channel_rsv()
500 	ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,  in pm8xxx_read_channel_rsv()
506 	ret = regmap_write(adc->map, ADC_ARB_USRP_DIG_PARAM,  in pm8xxx_read_channel_rsv()
513 	ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,  in pm8xxx_read_channel_rsv()
519 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,  in pm8xxx_read_channel_rsv()
523 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,  in pm8xxx_read_channel_rsv()
530 	reinit_completion(&adc->complete);  in pm8xxx_read_channel_rsv()
531 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,  in pm8xxx_read_channel_rsv()
538 	ret = wait_for_completion_timeout(&adc->complete,  in pm8xxx_read_channel_rsv()
541 		dev_err(adc->dev, "conversion timed out\n");  in pm8xxx_read_channel_rsv()
546 	ret = regmap_read(adc->map, ADC_ARB_USRP_DATA0, &val);  in pm8xxx_read_channel_rsv()
550 	ret = regmap_read(adc->map, ADC_ARB_USRP_DATA1, &val);  in pm8xxx_read_channel_rsv()
556 	/* Turn off the ADC by setting the arbiter to 0 twice */  in pm8xxx_read_channel_rsv()
557 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);  in pm8xxx_read_channel_rsv()
560 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);  in pm8xxx_read_channel_rsv()
565 	mutex_unlock(&adc->lock);  in pm8xxx_read_channel_rsv()
569 static int pm8xxx_read_channel(struct pm8xxx_xoadc *adc,  in pm8xxx_read_channel()  argument
578 	return pm8xxx_read_channel_rsv(adc, ch, 0xff, adc_code, false);  in pm8xxx_read_channel()
581 static int pm8xxx_calibrate_device(struct pm8xxx_xoadc *adc)  in pm8xxx_calibrate_device()  argument
590 	adc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;  in pm8xxx_calibrate_device()
591 	adc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;  in pm8xxx_calibrate_device()
594 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);  in pm8xxx_calibrate_device()
597 	ret = pm8xxx_read_channel(adc, ch, &read_1250v);  in pm8xxx_calibrate_device()
599 		dev_err(adc->dev, "could not read 1.25V reference channel\n");  in pm8xxx_calibrate_device()
602 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);  in pm8xxx_calibrate_device()
605 	ret = pm8xxx_read_channel(adc, ch, &read_0625v);  in pm8xxx_calibrate_device()
607 		dev_err(adc->dev, "could not read 0.625V reference channel\n");  in pm8xxx_calibrate_device()
611 		dev_err(adc->dev, "read same ADC code for 1.25V and 0.625V\n");  in pm8xxx_calibrate_device()
615 	adc->graph[VADC_CALIB_ABSOLUTE].dy = read_1250v - read_0625v;  in pm8xxx_calibrate_device()
616 	adc->graph[VADC_CALIB_ABSOLUTE].gnd = read_0625v;  in pm8xxx_calibrate_device()
618 	dev_info(adc->dev, "absolute calibration dx = %d uV, dy = %d units\n",  in pm8xxx_calibrate_device()
619 		 VADC_ABSOLUTE_RANGE_UV, adc->graph[VADC_CALIB_ABSOLUTE].dy);  in pm8xxx_calibrate_device()
622 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);  in pm8xxx_calibrate_device()
625 	ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV5,  in pm8xxx_calibrate_device()
628 		dev_err(adc->dev, "could not read MUXOFF reference channel\n");  in pm8xxx_calibrate_device()
631 	ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV4,  in pm8xxx_calibrate_device()
634 		dev_err(adc->dev, "could not read MUXOFF reference channel\n");  in pm8xxx_calibrate_device()
637 	adc->graph[VADC_CALIB_RATIOMETRIC].dy =  in pm8xxx_calibrate_device()
639 	adc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_nomux_rsv4;  in pm8xxx_calibrate_device()
641 	dev_info(adc->dev, "ratiometric calibration dx = %d, dy = %d units\n",  in pm8xxx_calibrate_device()
643 		 adc->graph[VADC_CALIB_RATIOMETRIC].dy);  in pm8xxx_calibrate_device()
652 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_read_raw()  local
659 		ch = pm8xxx_get_channel(adc, chan->address);  in pm8xxx_read_raw()
661 			dev_err(adc->dev, "no such channel %lu\n",  in pm8xxx_read_raw()
665 		ret = pm8xxx_read_channel(adc, ch, &adc_code);  in pm8xxx_read_raw()
670 				      &adc->graph[ch->calibration],  in pm8xxx_read_raw()
679 		ch = pm8xxx_get_channel(adc, chan->address);  in pm8xxx_read_raw()
681 			dev_err(adc->dev, "no such channel %lu\n",  in pm8xxx_read_raw()
685 		ret = pm8xxx_read_channel(adc, ch, &adc_code);  in pm8xxx_read_raw()
699 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_of_xlate()  local
720 	for (i = 0; i < adc->nchans; i++)  in pm8xxx_of_xlate()
721 		if (adc->chans[i].hwchan->pre_scale_mux == pre_scale_mux &&  in pm8xxx_of_xlate()
722 		    adc->chans[i].hwchan->amux_channel == amux_channel)  in pm8xxx_of_xlate()
823 static int pm8xxx_xoadc_parse_channels(struct pm8xxx_xoadc *adc,  in pm8xxx_xoadc_parse_channels()  argument
831 	adc->nchans = of_get_available_child_count(np);  in pm8xxx_xoadc_parse_channels()
832 	if (!adc->nchans) {  in pm8xxx_xoadc_parse_channels()
833 		dev_err(adc->dev, "no channel children\n");  in pm8xxx_xoadc_parse_channels()
836 	dev_dbg(adc->dev, "found %d ADC channels\n", adc->nchans);  in pm8xxx_xoadc_parse_channels()
838 	adc->iio_chans = devm_kcalloc(adc->dev, adc->nchans,  in pm8xxx_xoadc_parse_channels()
839 				      sizeof(*adc->iio_chans), GFP_KERNEL);  in pm8xxx_xoadc_parse_channels()
840 	if (!adc->iio_chans)  in pm8xxx_xoadc_parse_channels()
843 	adc->chans = devm_kcalloc(adc->dev, adc->nchans,  in pm8xxx_xoadc_parse_channels()
844 				  sizeof(*adc->chans), GFP_KERNEL);  in pm8xxx_xoadc_parse_channels()
845 	if (!adc->chans)  in pm8xxx_xoadc_parse_channels()
850 		ch = &adc->chans[i];  in pm8xxx_xoadc_parse_channels()
851 		ret = pm8xxx_xoadc_parse_channel(adc->dev, child,  in pm8xxx_xoadc_parse_channels()
852 						 adc->variant->channels,  in pm8xxx_xoadc_parse_channels()
853 						 &adc->iio_chans[i],  in pm8xxx_xoadc_parse_channels()
863 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);  in pm8xxx_xoadc_parse_channels()
865 		dev_err(adc->dev, "missing 1.25V reference channel\n");  in pm8xxx_xoadc_parse_channels()
868 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);  in pm8xxx_xoadc_parse_channels()
870 		dev_err(adc->dev, "missing 0.625V reference channel\n");  in pm8xxx_xoadc_parse_channels()
873 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);  in pm8xxx_xoadc_parse_channels()
875 		dev_err(adc->dev, "missing MUXOFF reference channel\n");  in pm8xxx_xoadc_parse_channels()
885 	struct pm8xxx_xoadc *adc;  in pm8xxx_xoadc_probe()  local
896 	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));  in pm8xxx_xoadc_probe()
901 	adc = iio_priv(indio_dev);  in pm8xxx_xoadc_probe()
902 	adc->dev = dev;  in pm8xxx_xoadc_probe()
903 	adc->variant = variant;  in pm8xxx_xoadc_probe()
904 	init_completion(&adc->complete);  in pm8xxx_xoadc_probe()
905 	mutex_init(&adc->lock);  in pm8xxx_xoadc_probe()
907 	ret = pm8xxx_xoadc_parse_channels(adc, np);  in pm8xxx_xoadc_probe()
916 	adc->map = map;  in pm8xxx_xoadc_probe()
919 	adc->vref = devm_regulator_get(dev, "xoadc-ref");  in pm8xxx_xoadc_probe()
920 	if (IS_ERR(adc->vref)) {  in pm8xxx_xoadc_probe()
922 		return PTR_ERR(adc->vref);  in pm8xxx_xoadc_probe()
924 	ret = regulator_enable(adc->vref);  in pm8xxx_xoadc_probe()
940 	indio_dev->channels = adc->iio_chans;  in pm8xxx_xoadc_probe()
941 	indio_dev->num_channels = adc->nchans;  in pm8xxx_xoadc_probe()
947 	ret = pm8xxx_calibrate_device(adc);  in pm8xxx_xoadc_probe()
958 	regulator_disable(adc->vref);  in pm8xxx_xoadc_probe()
966 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_xoadc_remove()  local
970 	regulator_disable(adc->vref);  in pm8xxx_xoadc_remove()
1000 		.compatible = "qcom,pm8018-adc",
1004 		.compatible = "qcom,pm8038-adc",
1008 		.compatible = "qcom,pm8058-adc",
1012 		.compatible = "qcom,pm8921-adc",
1021 		.name	= "pm8xxx-adc",