1 // SPDX-License-Identifier: GPL-2.0+
3  * as3935.c - Support for AS3935 Franklin lightning sensor
5  * Copyright (C) 2014, 2017-2018
15 #include <linux/devm-helpers.h>
94 	ret = spi_w8r8(st->spi, cmd);  in as3935_read()
106 	u8 *buf = st->buf;  in as3935_write()
111 	return spi_write(st->spi, buf, 2);  in as3935_write()
139 		return -EINVAL;  in as3935_sensor_sensitivity_store()
142 		return -EINVAL;  in as3935_sensor_sensitivity_store()
156 	mutex_lock(&st->lock);  in as3935_noise_level_tripped_show()
157 	ret = sysfs_emit(buf, "%d\n", !time_after(jiffies, st->noise_tripped + HZ));  in as3935_noise_level_tripped_show()
158 	mutex_unlock(&st->lock);  in as3935_noise_level_tripped_show()
199 			return -EINVAL;  in as3935_read_raw()
211 		return -EINVAL;  in as3935_read_raw()
224 	struct iio_poll_func *pf = private;  in as3935_trigger_handler()  local
225 	struct iio_dev *indio_dev = pf->indio_dev;  in as3935_trigger_handler()
233 	st->scan.chan = val & AS3935_DATA_MASK;  in as3935_trigger_handler()
234 	iio_push_to_buffers_with_timestamp(indio_dev, &st->scan,  in as3935_trigger_handler()
237 	iio_trigger_notify_done(indio_dev->trig);  in as3935_trigger_handler()
252 		dev_warn(&st->spi->dev, "read error\n");  in as3935_event_work()
260 		iio_trigger_poll_chained(st->trig);  in as3935_event_work()
264 		mutex_lock(&st->lock);  in as3935_event_work()
265 		st->noise_tripped = jiffies;  in as3935_event_work()
266 		mutex_unlock(&st->lock);  in as3935_event_work()
267 		dev_warn(&st->spi->dev, "noise level is too high\n");  in as3935_event_work()
282 	schedule_delayed_work(&st->work, msecs_to_jiffies(3));  in as3935_interrupt_handler()
292 		BIT(5) | (st->tune_cap / TUNE_CAP_DIV));  in calibrate_as3935()
295 	as3935_write(st, AS3935_TUNE_CAP, (st->tune_cap / TUNE_CAP_DIV));  in calibrate_as3935()
296 	as3935_write(st, AS3935_NFLWDTH, st->nflwdth_reg);  in calibrate_as3935()
305 	mutex_lock(&st->lock);  in as3935_suspend()
314 	mutex_unlock(&st->lock);  in as3935_suspend()
325 	mutex_lock(&st->lock);  in as3935_resume()
335 	mutex_unlock(&st->lock);  in as3935_resume()
344 	struct device *dev = &spi->dev;  in as3935_probe()
351 	if (!spi->irq) {  in as3935_probe()
353 		return -EINVAL;  in as3935_probe()
358 		return -ENOMEM;  in as3935_probe()
361 	st->spi = spi;  in as3935_probe()
364 	mutex_init(&st->lock);  in as3935_probe()
367 			"ams,tuning-capacitor-pf", &st->tune_cap);  in as3935_probe()
369 		st->tune_cap = 0;  in as3935_probe()
370 		dev_warn(dev, "no tuning-capacitor-pf set, defaulting to %d",  in as3935_probe()
371 			st->tune_cap);  in as3935_probe()
374 	if (st->tune_cap > MAX_PF_CAP) {  in as3935_probe()
375 		dev_err(dev, "wrong tuning-capacitor-pf setting of %d\n",  in as3935_probe()
376 			st->tune_cap);  in as3935_probe()
377 		return -EINVAL;  in as3935_probe()
381 			"ams,nflwdth", &st->nflwdth_reg);  in as3935_probe()
382 	if (!ret && st->nflwdth_reg > AS3935_NFLWDTH_MASK) {  in as3935_probe()
384 			st->nflwdth_reg);  in as3935_probe()
385 		return -EINVAL;  in as3935_probe()
388 	indio_dev->name = spi_get_device_id(spi)->name;  in as3935_probe()
389 	indio_dev->channels = as3935_channels;  in as3935_probe()
390 	indio_dev->num_channels = ARRAY_SIZE(as3935_channels);  in as3935_probe()
391 	indio_dev->modes = INDIO_DIRECT_MODE;  in as3935_probe()
392 	indio_dev->info = &as3935_info;  in as3935_probe()
394 	trig = devm_iio_trigger_alloc(dev, "%s-dev%d",  in as3935_probe()
395 				      indio_dev->name,  in as3935_probe()
399 		return -ENOMEM;  in as3935_probe()
401 	st->trig = trig;  in as3935_probe()
402 	st->noise_tripped = jiffies - HZ;  in as3935_probe()
422 	ret = devm_delayed_work_autocancel(dev, &st->work, as3935_event_work);  in as3935_probe()
426 	ret = devm_request_irq(dev, spi->irq,  in as3935_probe()