1 // SPDX-License-Identifier: GPL-2.0+
3  * max30100.c - Support for MAX30100 heart rate and pulse oximeter sensor
76 	__be16 buffer[2]; /* 2 16-bit channels */
147 		.scan_index = -1,
153 	return regmap_update_bits(data->regmap, MAX30100_REG_MODE_CONFIG,  in max30100_set_powermode()
162 	ret = regmap_write(data->regmap, MAX30100_REG_FIFO_WR_PTR, 0);  in max30100_clear_fifo()
166 	ret = regmap_write(data->regmap, MAX30100_REG_FIFO_OVR_CTR, 0);  in max30100_clear_fifo()
170 	return regmap_write(data->regmap, MAX30100_REG_FIFO_RD_PTR, 0);  in max30100_clear_fifo()
202 	ret = regmap_read(data->regmap, MAX30100_REG_INT_STATUS, &val);  in max30100_fifo_count()
208 		return MAX30100_REG_FIFO_DATA_ENTRY_COUNT - 1;  in max30100_fifo_count()
217 	ret = i2c_smbus_read_i2c_block_data(data->client,  in max30100_read_measurement()
220 					    (u8 *) &data->buffer);  in max30100_read_measurement()
231 	mutex_lock(&data->lock);  in max30100_interrupt_handler()
238 		iio_push_to_buffers(data->indio_dev, data->buffer);  in max30100_interrupt_handler()
239 		cnt--;  in max30100_interrupt_handler()
242 	mutex_unlock(&data->lock);  in max30100_interrupt_handler()
251 	/* LED turned off */  in max30100_get_current_idx()
264 	return -EINVAL;  in max30100_get_current_idx()
269 	struct device *dev = &data->client->dev;  in max30100_led_init()
273 	ret = device_property_read_u32_array(dev, "maxim,led-current-microamp",  in max30100_led_init()
276 		/* Default to 24 mA RED LED, 50 mA IR LED */  in max30100_led_init()
280 		dev_warn(dev, "no led-current-microamp set");  in max30100_led_init()
282 		return regmap_write(data->regmap, MAX30100_REG_LED_CONFIG, reg);  in max30100_led_init()
285 	/* RED LED current */  in max30100_led_init()
288 		dev_err(dev, "invalid RED current setting %d", val[0]);  in max30100_led_init()
292 	ret = regmap_update_bits(data->regmap, MAX30100_REG_LED_CONFIG,  in max30100_led_init()
299 	/* IR LED current */  in max30100_led_init()
302 		dev_err(dev, "invalid IR current setting %d", val[1]);  in max30100_led_init()
306 	return regmap_update_bits(data->regmap, MAX30100_REG_LED_CONFIG,  in max30100_led_init()
314 	/* setup LED current settings */  in max30100_chip_init()
319 	/* enable hi-res SPO2 readings at 100Hz */  in max30100_chip_init()
320 	ret = regmap_write(data->regmap, MAX30100_REG_SPO2_CONFIG,  in max30100_chip_init()
327 	ret = regmap_update_bits(data->regmap, MAX30100_REG_MODE_CONFIG,  in max30100_chip_init()
335 	return regmap_update_bits(data->regmap, MAX30100_REG_INT_ENABLE,  in max30100_chip_init()
346 	ret = regmap_read(data->regmap, MAX30100_REG_TEMP_INTEGER, &reg);  in max30100_read_temp()
351 	ret = regmap_read(data->regmap, MAX30100_REG_TEMP_FRACTION, &reg);  in max30100_read_temp()
366 	ret = regmap_update_bits(data->regmap, MAX30100_REG_MODE_CONFIG,  in max30100_get_temp()
382 	int ret = -EINVAL;  in max30100_read_raw()
390 		mutex_lock(&indio_dev->mlock);  in max30100_read_raw()
393 			ret = -EAGAIN;  in max30100_read_raw()
401 		mutex_unlock(&indio_dev->mlock);  in max30100_read_raw()
424 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in max30100_probe()
426 		return -ENOMEM;  in max30100_probe()
428 	indio_dev->name = MAX30100_DRV_NAME;  in max30100_probe()
429 	indio_dev->channels = max30100_channels;  in max30100_probe()
430 	indio_dev->info = &max30100_info;  in max30100_probe()
431 	indio_dev->num_channels = ARRAY_SIZE(max30100_channels);  in max30100_probe()
432 	indio_dev->available_scan_masks = max30100_scan_masks;  in max30100_probe()
433 	indio_dev->modes = INDIO_DIRECT_MODE;  in max30100_probe()
435 	ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev,  in max30100_probe()
441 	data->indio_dev = indio_dev;  in max30100_probe()
442 	data->client = client;  in max30100_probe()
444 	mutex_init(&data->lock);  in max30100_probe()
447 	data->regmap = devm_regmap_init_i2c(client, &max30100_regmap_config);  in max30100_probe()
448 	if (IS_ERR(data->regmap)) {  in max30100_probe()
449 		dev_err(&client->dev, "regmap initialization failed.\n");  in max30100_probe()
450 		return PTR_ERR(data->regmap);  in max30100_probe()
458 	if (client->irq <= 0) {  in max30100_probe()
459 		dev_err(&client->dev, "no valid irq defined\n");  in max30100_probe()
460 		return -EINVAL;  in max30100_probe()
462 	ret = devm_request_threaded_irq(&client->dev, client->irq,  in max30100_probe()
467 		dev_err(&client->dev, "request irq (%d) failed\n", client->irq);  in max30100_probe()