Lines Matching +full:adc +full:- +full:channels
1 // SPDX-License-Identifier: GPL-2.0-only
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:
28 * drivers/misc/pmic8058-xoadc.c
29 * drivers/hwmon/pm8xxx-adc.c
57 /* Proper ADC registers */
99 * On a later ADC the decimation factors are defined as
123 * Physical channels which MUST exist on all PM variants in order to provide
155 * struct xoadc_channel - encodes channel properties and defaults
162 * @prescale: the channels have hard-coded prescale ratios defined
167 * ADC code to the value that IIO expects, in uV or millicelsius
185 * struct xoadc_variant - encodes the XOADC variant characteristics
187 * @channels: the hardware channels and respective settings and defaults
196 const struct xoadc_channel *channels; member
228 * Taken from arch/arm/mach-msm/board-9615.c in the vendor tree:
245 * Taken from arch/arm/mach-msm/board-8930-pmic.c in the vendor tree:
270 * This was created by cross-referencing the vendor tree
271 * arch/arm/mach-msm/board-msm8x60.c msm_adc_channels_data[]
273 * configuration for these channels on an MSM8x60 i.e. PM8058
283 * AMUX channels 5 thru 9 are referred to as MPP5 thru MPP9 in
285 * channels just like any other. They are connected to a switching
287 * 1-to-1 onto MPP5 thru 9, so naming them MPP5 thru MPP9 is
301 /* There are also "unity" and divided by 3 channels (prescaler) but noone is using them */
306 * The PM8921 has some pre-muxing on its channels, this comes from the vendor tree
307 * include/linux/mfd/pm8xxx/pm8xxx-adc.h
308 * board-flo-pmic.c (Nexus 7) and board-8064-pmic.c
317 /* CHAN 6 & 7 (MPP1 & MPP2) are reserved for MPP channels on PM8921 */
327 /* The following channels have premux bit 0 set to 1 (all end in 4) */
346 /* The following channels have premux bit 1 set to 1 (all end in 8) */
369 * struct pm8xxx_chan_info - ADC channel information
387 * struct pm8xxx_xoadc - state container for the XOADC
392 * characteristics of the channels, and sensible default settings
393 * @nchans: number of channels, configured by the device tree
394 * @chans: the channel information per-channel, configured by the device tree
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()
431 if (ch->hwchan->amux_channel == chan) 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()
448 ch->name, ch->hwchan->amux_channel, ch->hwchan->pre_scale_mux, rsv); in pm8xxx_read_channel_rsv()
450 mutex_lock(&adc->lock); in pm8xxx_read_channel_rsv()
453 val = ch->hwchan->amux_channel << ADC_AMUX_SEL_SHIFT; in pm8xxx_read_channel_rsv()
454 val |= ch->hwchan->pre_scale_mux << ADC_AMUX_PREMUX_SHIFT; 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()
465 * reflected in the vendor tree drivers/misc/pmix8058-xoadc.c in pm8xxx_read_channel_rsv()
479 if (ch->hwchan->amux_channel == PM8XXX_CHANNEL_MUXOFF) in pm8xxx_read_channel_rsv()
485 rsvval = (ch->amux_ip_rsv << ADC_RSV_IP_SEL_SHIFT) | 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()
508 ch->decimation << ADC_DIG_PARAM_DEC_SHIFT); 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()
541 ret = -ETIMEDOUT; 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()
595 return -ENODEV; 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()
599 return -ENODEV; in pm8xxx_calibrate_device()
601 ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL); in pm8xxx_calibrate_device()
603 return -ENODEV; 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()
607 return -ENODEV; in pm8xxx_calibrate_device()
610 dev_err(adc->dev, "read same ADC code for 1.25V and 0.625V\n"); in pm8xxx_calibrate_device()
611 return -ENODEV; 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()
623 return -ENODEV; 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()
628 return -ENODEV; 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()
634 return -ENODEV; in pm8xxx_calibrate_device()
636 adc->graph[VADC_CALIB_RATIOMETRIC].dy = in pm8xxx_calibrate_device()
637 read_nomux_rsv5 - read_nomux_rsv4; 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()
661 chan->address); in pm8xxx_read_raw()
662 return -EINVAL; in pm8xxx_read_raw()
664 ret = pm8xxx_read_channel(adc, ch, &adc_code); in pm8xxx_read_raw()
668 ret = qcom_vadc_scale(ch->hwchan->scale_fn_type, in pm8xxx_read_raw()
669 &adc->graph[ch->calibration], in pm8xxx_read_raw()
670 &ch->hwchan->prescale, in pm8xxx_read_raw()
671 (ch->calibration == VADC_CALIB_ABSOLUTE), 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()
681 chan->address); in pm8xxx_read_raw()
682 return -EINVAL; in pm8xxx_read_raw()
684 ret = pm8xxx_read_channel(adc, ch, &adc_code); in pm8xxx_read_raw()
691 return -EINVAL; in pm8xxx_read_raw()
698 struct pm8xxx_xoadc *adc = iio_priv(indio_dev); in pm8xxx_of_xlate() local
707 if (iiospec->args_count != 2) { in pm8xxx_of_xlate()
708 dev_err(&indio_dev->dev, "wrong number of arguments for %pOFn need 2 got %d\n", in pm8xxx_of_xlate()
709 iiospec->np, in pm8xxx_of_xlate()
710 iiospec->args_count); in pm8xxx_of_xlate()
711 return -EINVAL; in pm8xxx_of_xlate()
713 pre_scale_mux = (u8)iiospec->args[0]; in pm8xxx_of_xlate()
714 amux_channel = (u8)iiospec->args[1]; in pm8xxx_of_xlate()
715 dev_dbg(&indio_dev->dev, "pre scale/mux: %02x, amux: %02x\n", in pm8xxx_of_xlate()
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()
724 return -EINVAL; in pm8xxx_of_xlate()
738 const char *name = np->name; in pm8xxx_xoadc_parse_channel()
759 while (hwchan && hwchan->datasheet_name) { in pm8xxx_xoadc_parse_channel()
760 if (hwchan->pre_scale_mux == pre_scale_mux && in pm8xxx_xoadc_parse_channel()
761 hwchan->amux_channel == amux_channel) in pm8xxx_xoadc_parse_channel()
767 if (!hwchan->datasheet_name) { in pm8xxx_xoadc_parse_channel()
770 return -EINVAL; in pm8xxx_xoadc_parse_channel()
772 ch->name = name; in pm8xxx_xoadc_parse_channel()
773 ch->hwchan = hwchan; in pm8xxx_xoadc_parse_channel()
775 ch->calibration = VADC_CALIB_ABSOLUTE; in pm8xxx_xoadc_parse_channel()
777 ch->decimation = VADC_DEF_DECIMATION; in pm8xxx_xoadc_parse_channel()
780 ch->calibration = VADC_CALIB_RATIOMETRIC; in pm8xxx_xoadc_parse_channel()
783 return -EINVAL; in pm8xxx_xoadc_parse_channel()
787 return -EINVAL; in pm8xxx_xoadc_parse_channel()
800 ch->decimation = ret; in pm8xxx_xoadc_parse_channel()
803 iio_chan->channel = chid; in pm8xxx_xoadc_parse_channel()
804 iio_chan->address = hwchan->amux_channel; in pm8xxx_xoadc_parse_channel()
805 iio_chan->datasheet_name = hwchan->datasheet_name; in pm8xxx_xoadc_parse_channel()
806 iio_chan->type = hwchan->type; in pm8xxx_xoadc_parse_channel()
807 /* All channels are raw or processed */ in pm8xxx_xoadc_parse_channel()
808 iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | in pm8xxx_xoadc_parse_channel()
810 iio_chan->indexed = 1; in pm8xxx_xoadc_parse_channel()
815 hwchan->pre_scale_mux, hwchan->amux_channel, ch->name, in pm8xxx_xoadc_parse_channel()
816 ch->amux_ip_rsv, ch->decimation, hwchan->prescale.num, in pm8xxx_xoadc_parse_channel()
817 hwchan->prescale.den, hwchan->scale_fn_type); in pm8xxx_xoadc_parse_channel()
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()
833 return -ENODEV; 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()
840 return -ENOMEM; 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()
845 return -ENOMEM; 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()
861 /* Check for required channels */ 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()
865 return -ENODEV; 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()
870 return -ENODEV; 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()
875 return -ENODEV; in pm8xxx_xoadc_parse_channels()
884 struct pm8xxx_xoadc *adc; in pm8xxx_xoadc_probe() local
886 struct device_node *np = pdev->dev.of_node; in pm8xxx_xoadc_probe()
888 struct device *dev = &pdev->dev; in pm8xxx_xoadc_probe()
893 return -ENODEV; in pm8xxx_xoadc_probe()
895 indio_dev = devm_iio_device_alloc(dev, sizeof(*adc)); in pm8xxx_xoadc_probe()
897 return -ENOMEM; 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()
910 map = dev_get_regmap(dev->parent, NULL); in pm8xxx_xoadc_probe()
913 return -ENXIO; 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()
930 pm8xxx_eoc_irq, NULL, 0, variant->name, indio_dev); in pm8xxx_xoadc_probe()
936 indio_dev->name = variant->name; in pm8xxx_xoadc_probe()
937 indio_dev->modes = INDIO_DIRECT_MODE; in pm8xxx_xoadc_probe()
938 indio_dev->info = &pm8xxx_xoadc_info; 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()
950 dev_info(dev, "%s XOADC driver enabled\n", variant->name); 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()
975 .name = "PM8018-XOADC",
976 .channels = pm8018_xoadc_channels,
980 .name = "PM8038-XOADC",
981 .channels = pm8038_xoadc_channels,
985 .name = "PM8058-XOADC",
986 .channels = pm8058_xoadc_channels,
992 .name = "PM8921-XOADC",
993 .channels = pm8921_xoadc_channels,
999 .compatible = "qcom,pm8018-adc",
1003 .compatible = "qcom,pm8038-adc",
1007 .compatible = "qcom,pm8058-adc",
1011 .compatible = "qcom,pm8921-adc",
1020 .name = "pm8xxx-adc",
1030 MODULE_ALIAS("platform:pm8xxx-xoadc");