1 // SPDX-License-Identifier: GPL-2.0+
3  * cc2.c - Support for the Amphenol ChipCap 2 relative humidity, temperature sensor
11  * https://www.amphenol-sensors.com/en/telaire/humidity/527-humidity-sensors/3095-chipcap-2
58 /* ensure clean off -> on transitions */
97 /* %RH as a per cent mille from a register value */
102 	return tmp / ((1 << 14) - 1);  in cc2_rh_convert()
108 	return data * ((1 << 14) - 1) / CC2_RH_MAX;  in cc2_rh_to_reg()
114 	unsigned long tmp = ((data >> 2) * 165 * 1000U) / ((1 << 14) - 1);  in cc2_temp_convert()
116 	return tmp - 40 * 1000U;  in cc2_temp_convert()
124 	if (regulator_is_enabled(data->regulator))  in cc2_enable()
128 	try_wait_for_completion(&data->complete);  in cc2_enable()
130 	ret = regulator_enable(data->regulator);  in cc2_enable()
136 	data->process_irqs = true;  in cc2_enable()
146 	data->process_irqs = false;  in cc2_disable()
149 	if (regulator_is_enabled(data->regulator)) {  in cc2_disable()
150 		err = regulator_disable(data->regulator);  in cc2_disable()
152 			dev_dbg(&data->client->dev, "Failed to disable device");  in cc2_disable()
162 		return -ETIMEDOUT;  in cc2_cmd_response_diagnostic()
170 		return -EBUSY;  in cc2_cmd_response_diagnostic()
180 		return -ENODATA;  in cc2_cmd_response_diagnostic()
183 		return -EINVAL;  in cc2_cmd_response_diagnostic()
194 		ret = ret < 0 ? ret : -EIO;  in cc2_read_command_status()
198 	return cc2_cmd_response_diagnostic(&client->dev, status);  in cc2_read_command_status()
203  * first 10 ms after power-up. Only in case the command window is missed,
216 		ret = i2c_smbus_write_word_data(data->client, CC2_START_CM, 0);  in cc2_command_mode_start()
220 		if (data->irq_ready > 0) {  in cc2_command_mode_start()
222 			ret = wait_for_completion_timeout(&data->complete,  in cc2_command_mode_start()
225 				return -ETIMEDOUT;  in cc2_command_mode_start()
230 		ret = cc2_read_command_status(data->client);  in cc2_command_mode_start()
231 		if (ret != -ETIMEDOUT || i == CC2_CM_RETRIES)  in cc2_command_mode_start()
249 	ret = i2c_smbus_write_word_data(data->client, CC2_START_NOM, 0);  in cc2_command_mode_finish()
266 	ret = i2c_smbus_write_word_data(data->client, reg, val);  in cc2_write_reg()
270 	if (data->irq_ready > 0) {  in cc2_write_reg()
272 		ret = wait_for_completion_timeout(&data->complete, timeout);  in cc2_write_reg()
274 			ret = -ETIMEDOUT;  in cc2_write_reg()
281 	ret = cc2_read_command_status(data->client);  in cc2_write_reg()
299 	ret = i2c_smbus_write_word_data(data->client, reg, 0);  in cc2_read_reg()
303 	if (data->irq_ready > 0) {  in cc2_read_reg()
305 		ret = wait_for_completion_timeout(&data->complete, timeout);  in cc2_read_reg()
307 			return -ETIMEDOUT;  in cc2_read_reg()
312 	ret = i2c_master_recv(data->client, buf, CC2_EEPROM_DATA_LEN);  in cc2_read_reg()
314 		return ret < 0 ? ret : -EIO;  in cc2_read_reg()
318 	return cc2_read_command_status(data->client);  in cc2_read_reg()
344 		ret = ret < 0 ? ret : -EIO;  in cc2_data_fetch()
349 		return -EBUSY;  in cc2_data_fetch()
352 		return -EIO;  in cc2_data_fetch()
362 		return -EINVAL;  in cc2_data_fetch()
374 	if (data->irq_ready > 0) {  in cc2_read_measurement()
376 		ret = wait_for_completion_timeout(&data->complete, timeout);  in cc2_read_measurement()
378 			return -ETIMEDOUT;  in cc2_read_measurement()
384 	ret = cc2_data_fetch(data->client, type, val);  in cc2_read_measurement()
414  * exiting the command mode, there is no need to force two power-up sequences.
453 			return cc2->rh_alarm.low_alarm_visible ? 0444 : 0;  in cc2_is_visible()
455 			return cc2->rh_alarm.high_alarm_visible ? 0444 : 0;  in cc2_is_visible()
458 			return cc2->rh_alarm.low_alarm_visible ? 0644 : 0;  in cc2_is_visible()
461 			return cc2->rh_alarm.high_alarm_visible ? 0644 : 0;  in cc2_is_visible()
483 	if (cc2->process_irqs)  in cc2_ready_interrupt()
484 		complete(&cc2->complete);  in cc2_ready_interrupt()
493 	if (cc2->process_irqs) {  in cc2_low_interrupt()
494 		hwmon_notify_event(cc2->hwmon, hwmon_humidity,  in cc2_low_interrupt()
496 		cc2->rh_alarm.low_alarm = true;  in cc2_low_interrupt()
506 	if (cc2->process_irqs) {  in cc2_high_interrupt()
507 		hwmon_notify_event(cc2->hwmon, hwmon_humidity,  in cc2_high_interrupt()
509 		cc2->rh_alarm.high_alarm = true;  in cc2_high_interrupt()
525 	if (data->rh_alarm.low_alarm) {  in cc2_humidity_min_alarm_status()
527 		data->rh_alarm.low_alarm = *val;  in cc2_humidity_min_alarm_status()
545 	if (data->rh_alarm.high_alarm) {  in cc2_humidity_max_alarm_status()
547 		data->rh_alarm.high_alarm = *val;  in cc2_humidity_max_alarm_status()
561 	mutex_lock(&data->dev_access_lock);  in cc2_read()
591 			ret = -EOPNOTSUPP;  in cc2_read()
595 		ret = -EOPNOTSUPP;  in cc2_read()
598 	mutex_unlock(&data->dev_access_lock);  in cc2_read()
612 		return -EOPNOTSUPP;  in cc2_write()
615 		return -EINVAL;  in cc2_write()
617 	mutex_lock(&data->dev_access_lock);  in cc2_write()
645 		ret = -EOPNOTSUPP;  in cc2_write()
649 	mutex_unlock(&data->dev_access_lock);  in cc2_write()
658 	data->irq_ready = fwnode_irq_get_byname(dev_fwnode(dev), "ready");  in cc2_request_ready_irq()
659 	if (data->irq_ready > 0) {  in cc2_request_ready_irq()
660 		init_completion(&data->complete);  in cc2_request_ready_irq()
661 		ret = devm_request_threaded_irq(dev, data->irq_ready, NULL,  in cc2_request_ready_irq()
675 	data->irq_low = fwnode_irq_get_byname(dev_fwnode(dev), "low");  in cc2_request_alarm_irqs()
676 	if (data->irq_low > 0) {  in cc2_request_alarm_irqs()
677 		ret = devm_request_threaded_irq(dev, data->irq_low, NULL,  in cc2_request_alarm_irqs()
685 		data->rh_alarm.low_alarm_visible = true;  in cc2_request_alarm_irqs()
688 	data->irq_high = fwnode_irq_get_byname(dev_fwnode(dev), "high");  in cc2_request_alarm_irqs()
689 	if (data->irq_high > 0) {  in cc2_request_alarm_irqs()
690 		ret = devm_request_threaded_irq(dev, data->irq_high, NULL,  in cc2_request_alarm_irqs()
698 		data->rh_alarm.high_alarm_visible = true;  in cc2_request_alarm_irqs()
726 	struct device *dev = &client->dev;  in cc2_probe()
729 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))  in cc2_probe()
730 		return -EOPNOTSUPP;  in cc2_probe()
734 		return -ENOMEM;  in cc2_probe()
738 	mutex_init(&data->dev_access_lock);  in cc2_probe()
740 	data->client = client;  in cc2_probe()
742 	data->regulator = devm_regulator_get_exclusive(dev, "vdd");  in cc2_probe()
743 	if (IS_ERR(data->regulator))  in cc2_probe()
744 		return dev_err_probe(dev, PTR_ERR(data->regulator),  in cc2_probe()
755 	data->hwmon = devm_hwmon_device_register_with_info(dev, client->name,  in cc2_probe()
758 	if (IS_ERR(data->hwmon))  in cc2_probe()
759 		return dev_err_probe(dev, PTR_ERR(data->hwmon),  in cc2_probe()