1 // SPDX-License-Identifier: GPL-2.0-only
6  * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
9 #include <linux/iio/adc/qcom-vadc-common.h>
20  * Thermal monitoring block consists of 8 (ADC_TM5_NUM_CHANNELS) channels. Each
21  * channel is programmed to use one of ADC channels for voltage comparison.
22  * Voltages are programmed using ADC codes, so we have to convert temp to
23  * voltage and then to ADC code value.
25  * Configuration of TM channels must match configuration of corresponding ADC
26  * channels.
96  * struct adc_tm5_channel - ADC Thermal Monitoring channel data.
98  * @adc_channel: corresponding ADC channel number.
104  * @chip: ADC TM chip instance.
119  * struct adc_tm5_chip - ADC Thermal Monitoring properties
123  * @channels: array of ADC TM channel data.
124  * @nchannels: amount of channels defined/allocated
126  * @avg_samples: ability to provide single result from the ADC
134 	struct adc_tm5_channel	*channels;  member
151 	return regmap_bulk_read(adc_tm->regmap, adc_tm->base + offset, data, len);  in adc_tm5_read()
156 	return regmap_bulk_write(adc_tm->regmap, adc_tm->base + offset, data, len);  in adc_tm5_write()
161 	return regmap_write_bits(adc_tm->regmap, adc_tm->base + offset, mask, val);  in adc_tm5_reg_update()
172 		dev_err(chip->dev, "read status low failed: %d\n", ret);  in adc_tm5_isr()
178 		dev_err(chip->dev, "read status high failed: %d\n", ret);  in adc_tm5_isr()
182 	for (i = 0; i < chip->nchannels; i++) {  in adc_tm5_isr()
184 		unsigned int ch = chip->channels[i].channel;  in adc_tm5_isr()
187 		if (!chip->channels[i].tzd)  in adc_tm5_isr()
192 			dev_err(chip->dev, "ctl read failed: %d, channel %d\n", ret, i);  in adc_tm5_isr()
206 			thermal_zone_device_update(chip->channels[i].tzd,  in adc_tm5_isr()
218 	if (!channel || !channel->iio)  in adc_tm5_get_temp()
219 		return -EINVAL;  in adc_tm5_get_temp()
221 	ret = iio_read_channel_processed(channel->iio, temp);  in adc_tm5_get_temp()
226 		return -EINVAL;  in adc_tm5_get_temp()
233 	struct adc_tm5_chip *chip = channel->chip;  in adc_tm5_disable_channel()
234 	unsigned int reg = ADC_TM5_M_EN(channel->channel);  in adc_tm5_disable_channel()
251 		dev_err(chip->dev, "adc-tm enable failed\n");  in adc_tm5_enable()
258 		dev_err(chip->dev, "adc-tm request conversion failed\n");  in adc_tm5_enable()
267 	struct adc_tm5_chip *chip = channel->chip;  in adc_tm5_configure()
269 	u16 reg = ADC_TM5_M_ADC_CH_SEL_CTL(channel->channel);  in adc_tm5_configure()
274 		dev_err(chip->dev, "channel %d params read failed: %d\n", channel->channel, ret);  in adc_tm5_configure()
278 	buf[0] = channel->adc_channel;  in adc_tm5_configure()
282 		u16 adc_code = qcom_adc_tm5_temp_volt_scale(channel->prescale,  in adc_tm5_configure()
283 				chip->data->full_scale_code_volt, high);  in adc_tm5_configure()
293 	if (low != -INT_MAX) {  in adc_tm5_configure()
294 		u16 adc_code = qcom_adc_tm5_temp_volt_scale(channel->prescale,  in adc_tm5_configure()
295 				chip->data->full_scale_code_volt, low);  in adc_tm5_configure()
308 	buf[6] |= FIELD_PREP(ADC_TM5_M_CTL_HW_SETTLE_DELAY_MASK, channel->hw_settle_time);  in adc_tm5_configure()
310 	buf[6] |= FIELD_PREP(ADC_TM5_M_CTL_CAL_SEL_MASK, channel->cal_method);  in adc_tm5_configure()
316 		dev_err(chip->dev, "channel %d params write failed: %d\n", channel->channel, ret);  in adc_tm5_configure()
330 		return -EINVAL;  in adc_tm5_set_trips()
332 	chip = channel->chip;  in adc_tm5_set_trips()
333 	dev_dbg(chip->dev, "%d:low(mdegC):%d, high(mdegC):%d\n",  in adc_tm5_set_trips()
334 		channel->channel, low, high);  in adc_tm5_set_trips()
336 	if (high == INT_MAX && low <= -INT_MAX)  in adc_tm5_set_trips()
354 	for (i = 0; i < adc_tm->nchannels; i++) {  in adc_tm5_register_tzd()
355 		adc_tm->channels[i].chip = adc_tm;  in adc_tm5_register_tzd()
357 		tzd = devm_thermal_zone_of_sensor_register(adc_tm->dev,  in adc_tm5_register_tzd()
358 							   adc_tm->channels[i].channel,  in adc_tm5_register_tzd()
359 							   &adc_tm->channels[i],  in adc_tm5_register_tzd()
362 			if (PTR_ERR(tzd) == -ENODEV) {  in adc_tm5_register_tzd()
363 				dev_warn(adc_tm->dev, "thermal sensor on channel %d is not used\n",  in adc_tm5_register_tzd()
364 					 adc_tm->channels[i].channel);  in adc_tm5_register_tzd()
368 			dev_err(adc_tm->dev, "Error registering TZ zone for channel %d: %ld\n",  in adc_tm5_register_tzd()
369 				adc_tm->channels[i].channel, PTR_ERR(tzd));  in adc_tm5_register_tzd()
372 		adc_tm->channels[i].tzd = tzd;  in adc_tm5_register_tzd()
387 		dev_err(chip->dev, "read failed for BTM channels\n");  in adc_tm5_init()
391 	for (i = 0; i < chip->nchannels; i++) {  in adc_tm5_init()
392 		if (chip->channels[i].channel >= channels_available) {  in adc_tm5_init()
393 			dev_err(chip->dev, "Invalid channel %d\n", chip->channels[i].channel);  in adc_tm5_init()
394 			return -EINVAL;  in adc_tm5_init()
398 	buf[0] = chip->decimation;  in adc_tm5_init()
399 	buf[1] = chip->avg_samples | ADC_TM5_FAST_AVG_EN;  in adc_tm5_init()
406 		dev_err(chip->dev, "block write failed: %d\n", ret);  in adc_tm5_init()
417 	const char *name = node->name;  in adc_tm5_get_dt_channel_data()
420 	struct device *dev = adc_tm->dev;  in adc_tm5_get_dt_channel_data()
431 		return -EINVAL;  in adc_tm5_get_dt_channel_data()
434 	channel->channel = chan;  in adc_tm5_get_dt_channel_data()
437 	 * We are tied to PMIC's ADC controller, which always use single  in adc_tm5_get_dt_channel_data()
439 	 * #io-channel-cells, just enforce cell_count = 1.  in adc_tm5_get_dt_channel_data()
441 	ret = of_parse_phandle_with_fixed_args(node, "io-channels", 1, 0, &args);  in adc_tm5_get_dt_channel_data()
443 		dev_err(dev, "%s: error parsing ADC channel number %d: %d\n", name, chan, ret);  in adc_tm5_get_dt_channel_data()
449 		dev_err(dev, "%s: invalid ADC channel number %d\n", name, chan);  in adc_tm5_get_dt_channel_data()
450 		return -EINVAL;  in adc_tm5_get_dt_channel_data()
452 	channel->adc_channel = args.args[0];  in adc_tm5_get_dt_channel_data()
454 	channel->iio = devm_of_iio_channel_get_by_name(adc_tm->dev, node, NULL);  in adc_tm5_get_dt_channel_data()
455 	if (IS_ERR(channel->iio)) {  in adc_tm5_get_dt_channel_data()
456 		ret = PTR_ERR(channel->iio);  in adc_tm5_get_dt_channel_data()
457 		if (ret != -EPROBE_DEFER)  in adc_tm5_get_dt_channel_data()
462 	ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);  in adc_tm5_get_dt_channel_data()
466 			dev_err(dev, "%s: invalid pre-scaling <%d %d>\n",  in adc_tm5_get_dt_channel_data()
470 		channel->prescale = ret;  in adc_tm5_get_dt_channel_data()
473 		channel->prescale = 0;  in adc_tm5_get_dt_channel_data()
476 	ret = of_property_read_u32(node, "qcom,hw-settle-time-us", &value);  in adc_tm5_get_dt_channel_data()
478 		ret = qcom_adc5_hw_settle_time_from_dt(value, adc_tm->data->hw_settle);  in adc_tm5_get_dt_channel_data()
480 			dev_err(dev, "%s invalid hw-settle-time-us %d us\n",  in adc_tm5_get_dt_channel_data()
484 		channel->hw_settle_time = ret;  in adc_tm5_get_dt_channel_data()
486 		channel->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;  in adc_tm5_get_dt_channel_data()
490 		channel->cal_method = ADC_TM5_RATIOMETRIC_CAL;  in adc_tm5_get_dt_channel_data()
492 		channel->cal_method = ADC_TM5_ABSOLUTE_CAL;  in adc_tm5_get_dt_channel_data()
499 	struct adc_tm5_channel *channels;  in adc_tm5_get_dt_data()  local
503 	struct device *dev = adc_tm->dev;  in adc_tm5_get_dt_data()
505 	adc_tm->nchannels = of_get_available_child_count(node);  in adc_tm5_get_dt_data()
506 	if (!adc_tm->nchannels)  in adc_tm5_get_dt_data()
507 		return -EINVAL;  in adc_tm5_get_dt_data()
509 	adc_tm->channels = devm_kcalloc(dev, adc_tm->nchannels,  in adc_tm5_get_dt_data()
510 					sizeof(*adc_tm->channels), GFP_KERNEL);  in adc_tm5_get_dt_data()
511 	if (!adc_tm->channels)  in adc_tm5_get_dt_data()
512 		return -ENOMEM;  in adc_tm5_get_dt_data()
514 	channels = adc_tm->channels;  in adc_tm5_get_dt_data()
516 	adc_tm->data = of_device_get_match_data(dev);  in adc_tm5_get_dt_data()
517 	if (!adc_tm->data)  in adc_tm5_get_dt_data()
518 		adc_tm->data = &adc_tm5_data_pmic;  in adc_tm5_get_dt_data()
522 		ret = qcom_adc5_decimation_from_dt(value, adc_tm->data->decimation);  in adc_tm5_get_dt_data()
527 		adc_tm->decimation = ret;  in adc_tm5_get_dt_data()
529 		adc_tm->decimation = ADC5_DECIMATION_DEFAULT;  in adc_tm5_get_dt_data()
532 	ret = of_property_read_u32(node, "qcom,avg-samples", &value);  in adc_tm5_get_dt_data()
536 			dev_err(dev, "invalid avg-samples %d\n", value);  in adc_tm5_get_dt_data()
539 		adc_tm->avg_samples = ret;  in adc_tm5_get_dt_data()
541 		adc_tm->avg_samples = VADC_DEF_AVG_SAMPLES;  in adc_tm5_get_dt_data()
545 		ret = adc_tm5_get_dt_channel_data(adc_tm, channels, child);  in adc_tm5_get_dt_data()
551 		channels++;  in adc_tm5_get_dt_data()
559 	struct device_node *node = pdev->dev.of_node;  in adc_tm5_probe()
560 	struct device *dev = &pdev->dev;  in adc_tm5_probe()
566 	regmap = dev_get_regmap(dev->parent, NULL);  in adc_tm5_probe()
568 		return -ENODEV;  in adc_tm5_probe()
574 	adc_tm = devm_kzalloc(&pdev->dev, sizeof(*adc_tm), GFP_KERNEL);  in adc_tm5_probe()
576 		return -ENOMEM;  in adc_tm5_probe()
578 	adc_tm->regmap = regmap;  in adc_tm5_probe()
579 	adc_tm->dev = dev;  in adc_tm5_probe()
580 	adc_tm->base = reg;  in adc_tm5_probe()
596 		dev_err(dev, "adc-tm init failed\n");  in adc_tm5_probe()
607 					 IRQF_ONESHOT, "pm-adc-tm5", adc_tm);  in adc_tm5_probe()
612 		.compatible = "qcom,spmi-adc-tm5",
621 		.name = "qcom-spmi-adc-tm5",
628 MODULE_DESCRIPTION("SPMI PMIC Thermal Monitor ADC driver");