21 #include <dt-bindings/iio/qcom,spmi-vadc.h>
23 #include "qcom-vadc-common.h"
25 /* VADC register and bit definitions */
76  * struct vadc_channel_prop - VADC channel property.
99  * struct vadc_priv - VADC private structure.
103  * @nchannels: number of VADC channels.
104  * @chan_props: array of VADC channel properties.
108  * @complete: VADC result notification after interrupt is received.
137 static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)  in vadc_read()  argument
139 	return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);  in vadc_read()
142 static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)  in vadc_write()  argument
144 	return regmap_write(vadc->regmap, vadc->base + offset, data);  in vadc_write()
147 static int vadc_reset(struct vadc_priv *vadc)  in vadc_reset()  argument
152 	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);  in vadc_reset()
156 	ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);  in vadc_reset()
160 	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);  in vadc_reset()
166 	return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);  in vadc_reset()
169 static int vadc_set_state(struct vadc_priv *vadc, bool state)  in vadc_set_state()  argument
171 	return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);  in vadc_set_state()
174 static void vadc_show_status(struct vadc_priv *vadc)  in vadc_show_status()  argument
179 	ret = vadc_read(vadc, VADC_MODE_CTL, &mode);  in vadc_show_status()
183 	ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);  in vadc_show_status()
187 	ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);  in vadc_show_status()
191 	ret = vadc_read(vadc, VADC_CONV_REQ, &req);  in vadc_show_status()
195 	ret = vadc_read(vadc, VADC_STATUS1, &sta1);  in vadc_show_status()
199 	ret = vadc_read(vadc, VADC_EN_CTL1, &en);  in vadc_show_status()
203 	dev_err(vadc->dev,  in vadc_show_status()
208 static int vadc_configure(struct vadc_priv *vadc,  in vadc_configure()  argument
217 	ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);  in vadc_configure()
222 	ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);  in vadc_configure()
228 	ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);  in vadc_configure()
233 	ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);  in vadc_configure()
237 	ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);  in vadc_configure()
242 		ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);  in vadc_configure()
244 		ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);  in vadc_configure()
249 static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)  in vadc_poll_wait_eoc()  argument
258 		ret = vadc_read(vadc, VADC_STATUS1, &sta1);  in vadc_poll_wait_eoc()
269 	vadc_show_status(vadc);  in vadc_poll_wait_eoc()
274 static int vadc_read_result(struct vadc_priv *vadc, u16 *data)  in vadc_read_result()  argument
278 	ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);  in vadc_read_result()
287 static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,  in vadc_get_channel()  argument
292 	for (i = 0; i < vadc->nchannels; i++)  in vadc_get_channel()
293 		if (vadc->chan_props[i].channel == num)  in vadc_get_channel()
294 			return &vadc->chan_props[i];  in vadc_get_channel()
296 	dev_dbg(vadc->dev, "no such channel %02x\n", num);  in vadc_get_channel()
301 static int vadc_do_conversion(struct vadc_priv *vadc,  in vadc_do_conversion()  argument
307 	mutex_lock(&vadc->lock);  in vadc_do_conversion()
309 	ret = vadc_configure(vadc, prop);  in vadc_do_conversion()
313 	if (!vadc->poll_eoc)  in vadc_do_conversion()
314 		reinit_completion(&vadc->complete);  in vadc_do_conversion()
316 	ret = vadc_set_state(vadc, true);  in vadc_do_conversion()
320 	ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);  in vadc_do_conversion()
326 	if (vadc->poll_eoc) {  in vadc_do_conversion()
327 		ret = vadc_poll_wait_eoc(vadc, timeout);  in vadc_do_conversion()
329 		ret = wait_for_completion_timeout(&vadc->complete, timeout);  in vadc_do_conversion()
336 		ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);  in vadc_do_conversion()
341 	ret = vadc_read_result(vadc, data);  in vadc_do_conversion()
344 	vadc_set_state(vadc, false);  in vadc_do_conversion()
346 		dev_err(vadc->dev, "conversion failed\n");  in vadc_do_conversion()
348 	mutex_unlock(&vadc->lock);  in vadc_do_conversion()
352 static int vadc_measure_ref_points(struct vadc_priv *vadc)  in vadc_measure_ref_points()  argument
358 	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;  in vadc_measure_ref_points()
359 	vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;  in vadc_measure_ref_points()
361 	prop = vadc_get_channel(vadc, VADC_REF_1250MV);  in vadc_measure_ref_points()
362 	ret = vadc_do_conversion(vadc, prop, &read_1);  in vadc_measure_ref_points()
367 	prop = vadc_get_channel(vadc, VADC_SPARE1);  in vadc_measure_ref_points()
369 		prop = vadc_get_channel(vadc, VADC_REF_625MV);  in vadc_measure_ref_points()
371 	ret = vadc_do_conversion(vadc, prop, &read_2);  in vadc_measure_ref_points()
380 	vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;  in vadc_measure_ref_points()
381 	vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;  in vadc_measure_ref_points()
384 	prop = vadc_get_channel(vadc, VADC_VDD_VADC);  in vadc_measure_ref_points()
385 	ret = vadc_do_conversion(vadc, prop, &read_1);  in vadc_measure_ref_points()
389 	prop = vadc_get_channel(vadc, VADC_GND_REF);  in vadc_measure_ref_points()
390 	ret = vadc_do_conversion(vadc, prop, &read_2);  in vadc_measure_ref_points()
399 	vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;  in vadc_measure_ref_points()
400 	vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;  in vadc_measure_ref_points()
403 		dev_err(vadc->dev, "measure reference points failed\n");  in vadc_measure_ref_points()
448 	struct vadc_priv *vadc = iio_priv(indio_dev);  in vadc_read_raw()  local
455 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
456 		ret = vadc_do_conversion(vadc, prop, &adc_code);  in vadc_read_raw()
461 				&vadc->graph[prop->calibration],  in vadc_read_raw()
470 		prop = &vadc->chan_props[chan->address];  in vadc_read_raw()
471 		ret = vadc_do_conversion(vadc, prop, &adc_code);  in vadc_read_raw()
488 	struct vadc_priv *vadc = iio_priv(indio_dev);  in vadc_of_xlate()  local
491 	for (i = 0; i < vadc->nchannels; i++)  in vadc_of_xlate()
492 		if (vadc->iio_chans[i].channel == iiospec->args[0])  in vadc_of_xlate()
735 static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)  in vadc_get_dt_data()  argument
744 	vadc->nchannels = of_get_available_child_count(node);  in vadc_get_dt_data()
745 	if (!vadc->nchannels)  in vadc_get_dt_data()
748 	vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_dt_data()
749 				       sizeof(*vadc->iio_chans), GFP_KERNEL);  in vadc_get_dt_data()
750 	if (!vadc->iio_chans)  in vadc_get_dt_data()
753 	vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,  in vadc_get_dt_data()
754 					sizeof(*vadc->chan_props), GFP_KERNEL);  in vadc_get_dt_data()
755 	if (!vadc->chan_props)  in vadc_get_dt_data()
758 	iio_chan = vadc->iio_chans;  in vadc_get_dt_data()
761 		ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);  in vadc_get_dt_data()
768 		vadc->chan_props[index] = prop;  in vadc_get_dt_data()
783 	if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {  in vadc_get_dt_data()
784 		dev_err(vadc->dev, "Please define 1.25V channel\n");  in vadc_get_dt_data()
788 	if (!vadc_get_channel(vadc, VADC_REF_625MV)) {  in vadc_get_dt_data()
789 		dev_err(vadc->dev, "Please define 0.625V channel\n");  in vadc_get_dt_data()
793 	if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {  in vadc_get_dt_data()
794 		dev_err(vadc->dev, "Please define VDD channel\n");  in vadc_get_dt_data()
798 	if (!vadc_get_channel(vadc, VADC_GND_REF)) {  in vadc_get_dt_data()
799 		dev_err(vadc->dev, "Please define GND channel\n");  in vadc_get_dt_data()
808 	struct vadc_priv *vadc = dev_id;  in vadc_isr()  local
810 	complete(&vadc->complete);  in vadc_isr()
815 static int vadc_check_revision(struct vadc_priv *vadc)  in vadc_check_revision()  argument
820 	ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);  in vadc_check_revision()
825 		dev_err(vadc->dev, "%d is not ADC\n", val);  in vadc_check_revision()
829 	ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);  in vadc_check_revision()
834 		dev_err(vadc->dev, "%d is not VADC\n", val);  in vadc_check_revision()
838 	ret = vadc_read(vadc, VADC_REVISION2, &val);  in vadc_check_revision()
843 		dev_err(vadc->dev, "revision %d not supported\n", val);  in vadc_check_revision()
855 	struct vadc_priv *vadc;  in vadc_probe()  local
868 	indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));  in vadc_probe()
872 	vadc = iio_priv(indio_dev);  in vadc_probe()
873 	vadc->regmap = regmap;  in vadc_probe()
874 	vadc->dev = dev;  in vadc_probe()
875 	vadc->base = reg;  in vadc_probe()
876 	vadc->are_ref_measured = false;  in vadc_probe()
877 	init_completion(&vadc->complete);  in vadc_probe()
878 	mutex_init(&vadc->lock);  in vadc_probe()
880 	ret = vadc_check_revision(vadc);  in vadc_probe()
884 	ret = vadc_get_dt_data(vadc, node);  in vadc_probe()
892 		vadc->poll_eoc = true;  in vadc_probe()
895 				       "spmi-vadc", vadc);  in vadc_probe()
900 	ret = vadc_reset(vadc);  in vadc_probe()
906 	ret = vadc_measure_ref_points(vadc);  in vadc_probe()
913 	indio_dev->channels = vadc->iio_chans;  in vadc_probe()
914 	indio_dev->num_channels = vadc->nchannels;  in vadc_probe()
920 	{ .compatible = "qcom,spmi-vadc" },
927 		   .name = "qcom-spmi-vadc",
934 MODULE_ALIAS("platform:qcom-spmi-vadc");