1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
94  * struct iadc_chip - IADC Current ADC device structure.
99  * @poll_eoc: Poll for end of conversion instead of waiting for IRQ.
122 	ret = regmap_read(iadc->regmap, iadc->base + offset, &val);  in iadc_read()
132 	return regmap_write(iadc->regmap, iadc->base + offset, data);  in iadc_write()
191 	dev_err(iadc->dev,  in iadc_status_show()
235 	if (!iadc->poll_eoc)  in iadc_configure()
236 		reinit_completion(&iadc->complete);  in iadc_configure()
248 	unsigned int count, retry;  in iadc_poll_wait_eoc()  local
252 	retry = interval_us / IADC_CONV_TIME_MIN_US;  in iadc_poll_wait_eoc()
254 	for (count = 0; count < retry; count++) {  in iadc_poll_wait_eoc()
268 	return -ETIMEDOUT;  in iadc_poll_wait_eoc()
273 	return regmap_bulk_read(iadc->regmap, iadc->base + IADC_DATA, data, 2);  in iadc_read_result()
287 	if (iadc->poll_eoc) {  in iadc_do_conversion()
290 		ret = wait_for_completion_timeout(&iadc->complete,  in iadc_do_conversion()
293 			ret = -ETIMEDOUT;  in iadc_do_conversion()
304 		dev_err(iadc->dev, "conversion failed\n");  in iadc_do_conversion()
320 		mutex_lock(&iadc->lock);  in iadc_read_raw()
321 		ret = iadc_do_conversion(iadc, chan->channel, &adc_raw);  in iadc_read_raw()
322 		mutex_unlock(&iadc->lock);  in iadc_read_raw()
326 		vsense_raw = adc_raw - iadc->offset[chan->channel];  in iadc_read_raw()
329 		vsense_uv /= (s32)iadc->gain - iadc->offset[chan->channel];  in iadc_read_raw()
331 		isense_ua = vsense_uv / iadc->rsense[chan->channel];  in iadc_read_raw()
333 		dev_dbg(iadc->dev, "off %d gain %d adc %d %duV I %duA\n",  in iadc_read_raw()
334 			iadc->offset[chan->channel], iadc->gain,  in iadc_read_raw()
345 	return -EINVAL;  in iadc_read_raw()
356 	complete(&iadc->complete);  in iadc_isr()
365 	ret = iadc_do_conversion(iadc, IADC_GAIN_17P857MV, &iadc->gain);  in iadc_update_offset()
370 				 &iadc->offset[IADC_INT_RSENSE]);  in iadc_update_offset()
374 	if (iadc->gain == iadc->offset[IADC_INT_RSENSE]) {  in iadc_update_offset()
375 		dev_err(iadc->dev, "error: internal offset == gain %d\n",  in iadc_update_offset()
376 			iadc->gain);  in iadc_update_offset()
377 		return -EINVAL;  in iadc_update_offset()
381 				 &iadc->offset[IADC_EXT_RSENSE]);  in iadc_update_offset()
385 	if (iadc->gain == iadc->offset[IADC_EXT_RSENSE]) {  in iadc_update_offset()
386 		dev_err(iadc->dev, "error: external offset == gain %d\n",  in iadc_update_offset()
387 			iadc->gain);  in iadc_update_offset()
388 		return -EINVAL;  in iadc_update_offset()
404 		dev_err(iadc->dev, "%d is not ADC\n", val);  in iadc_version_check()
405 		return -EINVAL;  in iadc_version_check()
413 		dev_err(iadc->dev, "%d is not IADC\n", val);  in iadc_version_check()
414 		return -EINVAL;  in iadc_version_check()
422 		dev_err(iadc->dev, "revision %d not supported\n", val);  in iadc_version_check()
423 		return -EINVAL;  in iadc_version_check()
434 	ret = of_property_read_u32(node, "qcom,external-resistor-micro-ohms",  in iadc_rsense_read()
435 				   &iadc->rsense[IADC_EXT_RSENSE]);  in iadc_rsense_read()
437 		iadc->rsense[IADC_EXT_RSENSE] = IADC_INT_RSENSE_IDEAL_VALUE;  in iadc_rsense_read()
439 	if (!iadc->rsense[IADC_EXT_RSENSE]) {  in iadc_rsense_read()
440 		dev_err(iadc->dev, "external resistor can't be zero Ohms");  in iadc_rsense_read()
441 		return -EINVAL;  in iadc_rsense_read()
452 	sign = (deviation & IADC_NOMINAL_RSENSE_SIGN_MASK) ? -1 : 1;  in iadc_rsense_read()
461 	iadc->rsense[IADC_INT_RSENSE] = int_sense;  in iadc_rsense_read()
486 	struct device_node *node = pdev->dev.of_node;  in iadc_probe()
487 	struct device *dev = &pdev->dev;  in iadc_probe()
495 		return -ENOMEM;  in iadc_probe()
498 	iadc->dev = dev;  in iadc_probe()
500 	iadc->regmap = dev_get_regmap(dev->parent, NULL);  in iadc_probe()
501 	if (!iadc->regmap)  in iadc_probe()
502 		return -ENODEV;  in iadc_probe()
504 	init_completion(&iadc->complete);  in iadc_probe()
505 	mutex_init(&iadc->lock);  in iadc_probe()
509 		return -ENODEV;  in iadc_probe()
511 	iadc->base = res;  in iadc_probe()
515 		return -ENODEV;  in iadc_probe()
519 		return -ENODEV;  in iadc_probe()
521 	dev_dbg(iadc->dev, "sense resistors %d and %d micro Ohm\n",  in iadc_probe()
522 		iadc->rsense[IADC_INT_RSENSE],  in iadc_probe()
523 		iadc->rsense[IADC_EXT_RSENSE]);  in iadc_probe()
526 	if (irq_eoc == -EPROBE_DEFER)  in iadc_probe()
530 		iadc->poll_eoc = true;  in iadc_probe()
538 	if (!iadc->poll_eoc) {  in iadc_probe()
540 					"spmi-iadc", iadc);  in iadc_probe()
546 		device_init_wakeup(iadc->dev, 1);  in iadc_probe()
555 	indio_dev->name = pdev->name;  in iadc_probe()
556 	indio_dev->modes = INDIO_DIRECT_MODE;  in iadc_probe()
557 	indio_dev->info = &iadc_info;  in iadc_probe()
558 	indio_dev->channels = iadc_channels;  in iadc_probe()
559 	indio_dev->num_channels = ARRAY_SIZE(iadc_channels);  in iadc_probe()
565 	{ .compatible = "qcom,spmi-iadc" },
573 		   .name = "qcom-spmi-iadc",
581 MODULE_ALIAS("platform:qcom-spmi-iadc");
584 MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");