1 // SPDX-License-Identifier: GPL-2.0-only
3   * iio/adc/max1027.c
182  * ->available_scan_masks, the core will select the most appropriate
183  * ->active_scan_mask and the "minimum" number of channels will be
188  * filter out the unneeded samples based on the ->active_scan_mask that has
195 	GENMASK(1, 1 - (temp)), GENMASK(2, 1 - (temp)),			\
196 	GENMASK(3, 1 - (temp)), GENMASK(4, 1 - (temp)),			\
197 	GENMASK(5, 1 - (temp)), GENMASK(6, 1 - (temp)),			\
198 	GENMASK(7, 1 - (temp)), GENMASK(8, 1 - (temp))
202 	GENMASK(9, 1 - (temp)), GENMASK(10, 1 - (temp)),		\
203 	GENMASK(11, 1 - (temp)), GENMASK(12, 1 - (temp))
207 	GENMASK(13, 1 - (temp)), GENMASK(14, 1 - (temp)),		\
208 	GENMASK(15, 1 - (temp)), GENMASK(16, 1 - (temp))
284 	if (st->spi->irq) {  in max1027_wait_eoc()
285 		ret = wait_for_completion_timeout(&st->complete,  in max1027_wait_eoc()
287 		reinit_completion(&st->complete);  in max1027_wait_eoc()
289 			return -ETIMEDOUT;  in max1027_wait_eoc()
291 		if (indio_dev->active_scan_mask)  in max1027_wait_eoc()
292 			conversion_time *= hweight32(*indio_dev->active_scan_mask);  in max1027_wait_eoc()
305 	st->reg = MAX1027_CONV_REG | MAX1027_SCAN_0_N;  in max1027_configure_chans_and_start()
306 	st->reg |= MAX1027_CHAN(fls(*indio_dev->active_scan_mask) - 2);  in max1027_configure_chans_and_start()
307 	if (*indio_dev->active_scan_mask & MAX1X27_SCAN_MASK_TEMP)  in max1027_configure_chans_and_start()
308 		st->reg |= MAX1027_TEMP;  in max1027_configure_chans_and_start()
310 	return spi_write(st->spi, &st->reg, 1);  in max1027_configure_chans_and_start()
317 	st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2;  in max1027_enable_trigger()
321 	 * MODE0: external hardware trigger wired to the cnvst input pin  in max1027_enable_trigger()
325 		st->reg |= MAX1027_CKS_MODE0;  in max1027_enable_trigger()
327 		st->reg |= MAX1027_CKS_MODE2;  in max1027_enable_trigger()
329 	return spi_write(st->spi, &st->reg, 1);  in max1027_enable_trigger()
344 	st->reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel) |  in max1027_read_single_value()
346 	if (chan->type == IIO_TEMP)  in max1027_read_single_value()
347 		st->reg |= MAX1027_TEMP;  in max1027_read_single_value()
348 	ret = spi_write(st->spi, &st->reg, 1);  in max1027_read_single_value()
350 		dev_err(&indio_dev->dev,  in max1027_read_single_value()
356 	 * For an unknown reason, when we use the mode "10" (write  in max1027_read_single_value()
365 	ret = spi_read(st->spi, st->buffer, (chan->type == IIO_TEMP) ? 4 : 2);  in max1027_read_single_value()
373 	*val = be16_to_cpu(st->buffer[0]);  in max1027_read_single_value()
385 	mutex_lock(&st->lock);  in max1027_read_raw()
392 		switch (chan->type) {  in max1027_read_raw()
400 			*val2 = chan->scan_type.realbits;  in max1027_read_raw()
404 			ret = -EINVAL;  in max1027_read_raw()
409 		ret = -EINVAL;  in max1027_read_raw()
413 	mutex_unlock(&st->lock);  in max1027_read_raw()
423 	u8 *val = (u8 *)st->buffer;  in max1027_debugfs_reg_access()
426 		int ret = spi_read(st->spi, val, 2);  in max1027_debugfs_reg_access()
427 		*readval = be16_to_cpu(st->buffer[0]);  in max1027_debugfs_reg_access()
432 	return spi_write(st->spi, val, 1);  in max1027_debugfs_reg_access()
444 	 * the external hardware trigger.  in max1027_set_cnvst_trigger_state()
465 	scanned_chans = fls(*indio_dev->active_scan_mask) - 1;  in max1027_read_scan()
466 	if (*indio_dev->active_scan_mask & MAX1X27_SCAN_MASK_TEMP)  in max1027_read_scan()
470 	ret = spi_read(st->spi, st->buffer, scanned_chans * 2);  in max1027_read_scan()
474 	iio_push_to_buffers(indio_dev, st->buffer);  in max1027_read_scan()
485 	 * If buffers are disabled (raw read) or when using external triggers,  in max1027_handler()
488 	 * When using the internal trigger, we must hand-off the choice of the  in max1027_handler()
496 		complete(&st->complete);  in max1027_handler()
498 		iio_trigger_poll(indio_dev->trig);  in max1027_handler()
506 	struct iio_dev *indio_dev = pf->indio_dev;  in max1027_trigger_handler()
523 		dev_err(&indio_dev->dev,  in max1027_trigger_handler()
526 	iio_trigger_notify_done(indio_dev->trig);  in max1027_trigger_handler()
547 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in max1027_probe()
550 		return -ENOMEM;  in max1027_probe()
554 	st->spi = spi;  in max1027_probe()
555 	st->info = &max1027_chip_info_tbl[spi_get_device_id(spi)->driver_data];  in max1027_probe()
557 	mutex_init(&st->lock);  in max1027_probe()
558 	init_completion(&st->complete);  in max1027_probe()
560 	indio_dev->name = spi_get_device_id(spi)->name;  in max1027_probe()
561 	indio_dev->info = &max1027_info;  in max1027_probe()
562 	indio_dev->modes = INDIO_DIRECT_MODE;  in max1027_probe()
563 	indio_dev->channels = st->info->channels;  in max1027_probe()
564 	indio_dev->num_channels = st->info->num_channels;  in max1027_probe()
565 	indio_dev->available_scan_masks = st->info->available_scan_masks;  in max1027_probe()
567 	st->buffer = devm_kmalloc_array(&indio_dev->dev,  in max1027_probe()
568 					indio_dev->num_channels, 2,  in max1027_probe()
570 	if (!st->buffer)  in max1027_probe()
571 		return -ENOMEM;  in max1027_probe()
574 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,  in max1027_probe()
579 		dev_err(&indio_dev->dev, "Failed to setup buffer\n");  in max1027_probe()
584 	if (spi->irq) {  in max1027_probe()
585 		st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",  in max1027_probe()
586 						  indio_dev->name);  in max1027_probe()
587 		if (!st->trig) {  in max1027_probe()
588 			ret = -ENOMEM;  in max1027_probe()
589 			dev_err(&indio_dev->dev,  in max1027_probe()
594 		st->trig->ops = &max1027_trigger_ops;  in max1027_probe()
595 		iio_trigger_set_drvdata(st->trig, indio_dev);  in max1027_probe()
596 		ret = devm_iio_trigger_register(&indio_dev->dev,  in max1027_probe()
597 						st->trig);  in max1027_probe()
599 			dev_err(&indio_dev->dev,  in max1027_probe()
604 		ret = devm_request_irq(&spi->dev, spi->irq, max1027_handler,  in max1027_probe()
606 				       spi->dev.driver->name, indio_dev);  in max1027_probe()
608 			dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");  in max1027_probe()
614 	st->reg = MAX1027_RST_REG;  in max1027_probe()
615 	ret = spi_write(st->spi, &st->reg, 1);  in max1027_probe()
617 		dev_err(&indio_dev->dev, "Failed to reset the ADC\n");  in max1027_probe()
622 	st->reg = MAX1027_AVG_REG;  in max1027_probe()
623 	ret = spi_write(st->spi, &st->reg, 1);  in max1027_probe()
625 		dev_err(&indio_dev->dev, "Failed to configure averaging register\n");  in max1027_probe()
634 	return devm_iio_device_register(&spi->dev, indio_dev);  in max1027_probe()
648 MODULE_DESCRIPTION("MAX1X27/MAX1X29/MAX1X31 ADC");