7  * specific-purpose and general purpose ADC converters and channels.
13 #include <linux/iio/adc/qcom-vadc-common.h>
27  * Qualcomm tree. Their kernel has two out-of-tree drivers for the ADC:
29  * drivers/hwmon/pm8xxx-adc.c
57 /* Proper ADC registers */
99  * On a later ADC the decimation factors are defined as
167  * ADC code to the value that IIO expects, in uV or millicelsius
307  * include/linux/mfd/pm8xxx/pm8xxx-adc.h
369  * struct pm8xxx_chan_info - ADC channel information
417 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_eoc_irq()  local
419 	complete(&adc->complete);  in pm8xxx_eoc_irq()
425 pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)  in pm8xxx_get_channel()  argument
429 	for (i = 0; i < adc->nchans; i++) {  in pm8xxx_get_channel()
430 		struct pm8xxx_chan_info *ch = &adc->chans[i];  in pm8xxx_get_channel()
437 static int pm8xxx_read_channel_rsv(struct pm8xxx_xoadc *adc,  in pm8xxx_read_channel_rsv()  argument
447 	dev_dbg(adc->dev, "read channel \"%s\", amux %d, prescale/mux: %d, rsv %d\n",  in pm8xxx_read_channel_rsv()
450 	mutex_lock(&adc->lock);  in pm8xxx_read_channel_rsv()
455 	ret = regmap_write(adc->map, ADC_ARB_USRP_AMUX_CNTRL, val);  in pm8xxx_read_channel_rsv()
462 	if (adc->variant->broken_ratiometric && !force_ratiometric) {  in pm8xxx_read_channel_rsv()
492 	ret = regmap_update_bits(adc->map,  in pm8xxx_read_channel_rsv()
499 	ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,  in pm8xxx_read_channel_rsv()
505 	ret = regmap_write(adc->map, ADC_ARB_USRP_DIG_PARAM,  in pm8xxx_read_channel_rsv()
512 	ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,  in pm8xxx_read_channel_rsv()
518 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,  in pm8xxx_read_channel_rsv()
522 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,  in pm8xxx_read_channel_rsv()
529 	reinit_completion(&adc->complete);  in pm8xxx_read_channel_rsv()
530 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,  in pm8xxx_read_channel_rsv()
537 	ret = wait_for_completion_timeout(&adc->complete,  in pm8xxx_read_channel_rsv()
540 		dev_err(adc->dev, "conversion timed out\n");  in pm8xxx_read_channel_rsv()
545 	ret = regmap_read(adc->map, ADC_ARB_USRP_DATA0, &val);  in pm8xxx_read_channel_rsv()
549 	ret = regmap_read(adc->map, ADC_ARB_USRP_DATA1, &val);  in pm8xxx_read_channel_rsv()
555 	/* Turn off the ADC by setting the arbiter to 0 twice */  in pm8xxx_read_channel_rsv()
556 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);  in pm8xxx_read_channel_rsv()
559 	ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);  in pm8xxx_read_channel_rsv()
564 	mutex_unlock(&adc->lock);  in pm8xxx_read_channel_rsv()
568 static int pm8xxx_read_channel(struct pm8xxx_xoadc *adc,  in pm8xxx_read_channel()  argument
577 	return pm8xxx_read_channel_rsv(adc, ch, 0xff, adc_code, false);  in pm8xxx_read_channel()
580 static int pm8xxx_calibrate_device(struct pm8xxx_xoadc *adc)  in pm8xxx_calibrate_device()  argument
589 	adc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;  in pm8xxx_calibrate_device()
590 	adc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;  in pm8xxx_calibrate_device()
593 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);  in pm8xxx_calibrate_device()
596 	ret = pm8xxx_read_channel(adc, ch, &read_1250v);  in pm8xxx_calibrate_device()
598 		dev_err(adc->dev, "could not read 1.25V reference channel\n");  in pm8xxx_calibrate_device()
601 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);  in pm8xxx_calibrate_device()
604 	ret = pm8xxx_read_channel(adc, ch, &read_0625v);  in pm8xxx_calibrate_device()
606 		dev_err(adc->dev, "could not read 0.625V reference channel\n");  in pm8xxx_calibrate_device()
610 		dev_err(adc->dev, "read same ADC code for 1.25V and 0.625V\n");  in pm8xxx_calibrate_device()
614 	adc->graph[VADC_CALIB_ABSOLUTE].dy = read_1250v - read_0625v;  in pm8xxx_calibrate_device()
615 	adc->graph[VADC_CALIB_ABSOLUTE].gnd = read_0625v;  in pm8xxx_calibrate_device()
617 	dev_info(adc->dev, "absolute calibration dx = %d uV, dy = %d units\n",  in pm8xxx_calibrate_device()
618 		 VADC_ABSOLUTE_RANGE_UV, adc->graph[VADC_CALIB_ABSOLUTE].dy);  in pm8xxx_calibrate_device()
621 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);  in pm8xxx_calibrate_device()
624 	ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV5,  in pm8xxx_calibrate_device()
627 		dev_err(adc->dev, "could not read MUXOFF reference channel\n");  in pm8xxx_calibrate_device()
630 	ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV4,  in pm8xxx_calibrate_device()
633 		dev_err(adc->dev, "could not read MUXOFF reference channel\n");  in pm8xxx_calibrate_device()
636 	adc->graph[VADC_CALIB_RATIOMETRIC].dy =  in pm8xxx_calibrate_device()
638 	adc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_nomux_rsv4;  in pm8xxx_calibrate_device()
640 	dev_info(adc->dev, "ratiometric calibration dx = %d, dy = %d units\n",  in pm8xxx_calibrate_device()
642 		 adc->graph[VADC_CALIB_RATIOMETRIC].dy);  in pm8xxx_calibrate_device()
651 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_read_raw()  local
658 		ch = pm8xxx_get_channel(adc, chan->address);  in pm8xxx_read_raw()
660 			dev_err(adc->dev, "no such channel %lu\n",  in pm8xxx_read_raw()
664 		ret = pm8xxx_read_channel(adc, ch, &adc_code);  in pm8xxx_read_raw()
669 				      &adc->graph[ch->calibration],  in pm8xxx_read_raw()
678 		ch = pm8xxx_get_channel(adc, chan->address);  in pm8xxx_read_raw()
680 			dev_err(adc->dev, "no such channel %lu\n",  in pm8xxx_read_raw()
684 		ret = pm8xxx_read_channel(adc, ch, &adc_code);  in pm8xxx_read_raw()
698 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_of_xlate()  local
719 	for (i = 0; i < adc->nchans; i++)  in pm8xxx_of_xlate()
720 		if (adc->chans[i].hwchan->pre_scale_mux == pre_scale_mux &&  in pm8xxx_of_xlate()
721 		    adc->chans[i].hwchan->amux_channel == amux_channel)  in pm8xxx_of_xlate()
822 static int pm8xxx_xoadc_parse_channels(struct pm8xxx_xoadc *adc,  in pm8xxx_xoadc_parse_channels()  argument
830 	adc->nchans = of_get_available_child_count(np);  in pm8xxx_xoadc_parse_channels()
831 	if (!adc->nchans) {  in pm8xxx_xoadc_parse_channels()
832 		dev_err(adc->dev, "no channel children\n");  in pm8xxx_xoadc_parse_channels()
835 	dev_dbg(adc->dev, "found %d ADC channels\n", adc->nchans);  in pm8xxx_xoadc_parse_channels()
837 	adc->iio_chans = devm_kcalloc(adc->dev, adc->nchans,  in pm8xxx_xoadc_parse_channels()
838 				      sizeof(*adc->iio_chans), GFP_KERNEL);  in pm8xxx_xoadc_parse_channels()
839 	if (!adc->iio_chans)  in pm8xxx_xoadc_parse_channels()
842 	adc->chans = devm_kcalloc(adc->dev, adc->nchans,  in pm8xxx_xoadc_parse_channels()
843 				  sizeof(*adc->chans), GFP_KERNEL);  in pm8xxx_xoadc_parse_channels()
844 	if (!adc->chans)  in pm8xxx_xoadc_parse_channels()
849 		ch = &adc->chans[i];  in pm8xxx_xoadc_parse_channels()
850 		ret = pm8xxx_xoadc_parse_channel(adc->dev, child,  in pm8xxx_xoadc_parse_channels()
851 						 adc->variant->channels,  in pm8xxx_xoadc_parse_channels()
852 						 &adc->iio_chans[i],  in pm8xxx_xoadc_parse_channels()
862 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);  in pm8xxx_xoadc_parse_channels()
864 		dev_err(adc->dev, "missing 1.25V reference channel\n");  in pm8xxx_xoadc_parse_channels()
867 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);  in pm8xxx_xoadc_parse_channels()
869 		dev_err(adc->dev, "missing 0.625V reference channel\n");  in pm8xxx_xoadc_parse_channels()
872 	ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);  in pm8xxx_xoadc_parse_channels()
874 		dev_err(adc->dev, "missing MUXOFF reference channel\n");  in pm8xxx_xoadc_parse_channels()
884 	struct pm8xxx_xoadc *adc;  in pm8xxx_xoadc_probe()  local
895 	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));  in pm8xxx_xoadc_probe()
900 	adc = iio_priv(indio_dev);  in pm8xxx_xoadc_probe()
901 	adc->dev = dev;  in pm8xxx_xoadc_probe()
902 	adc->variant = variant;  in pm8xxx_xoadc_probe()
903 	init_completion(&adc->complete);  in pm8xxx_xoadc_probe()
904 	mutex_init(&adc->lock);  in pm8xxx_xoadc_probe()
906 	ret = pm8xxx_xoadc_parse_channels(adc, np);  in pm8xxx_xoadc_probe()
915 	adc->map = map;  in pm8xxx_xoadc_probe()
918 	adc->vref = devm_regulator_get(dev, "xoadc-ref");  in pm8xxx_xoadc_probe()
919 	if (IS_ERR(adc->vref)) {  in pm8xxx_xoadc_probe()
921 		return PTR_ERR(adc->vref);  in pm8xxx_xoadc_probe()
923 	ret = regulator_enable(adc->vref);  in pm8xxx_xoadc_probe()
939 	indio_dev->channels = adc->iio_chans;  in pm8xxx_xoadc_probe()
940 	indio_dev->num_channels = adc->nchans;  in pm8xxx_xoadc_probe()
946 	ret = pm8xxx_calibrate_device(adc);  in pm8xxx_xoadc_probe()
957 	regulator_disable(adc->vref);  in pm8xxx_xoadc_probe()
965 	struct pm8xxx_xoadc *adc = iio_priv(indio_dev);  in pm8xxx_xoadc_remove()  local
969 	regulator_disable(adc->vref);  in pm8xxx_xoadc_remove()
999 		.compatible = "qcom,pm8018-adc",
1003 		.compatible = "qcom,pm8038-adc",
1007 		.compatible = "qcom,pm8058-adc",
1011 		.compatible = "qcom,pm8921-adc",
1020 		.name	= "pm8xxx-adc",