1 // SPDX-License-Identifier: GPL-2.0-or-later
13 #include <linux/hwmon-sysfs.h>
19 /* commands (high precision mode) */
23 /* commands (low precision mode) */
41 /* delays for non-blocking i2c commands, both in us */
75 	int ret = i2c_master_send(client, data->command, SHTC1_CMD_LENGTH);  in shtc1_update_values()
77 		dev_err(&client->dev, "failed to send command: %d\n", ret);  in shtc1_update_values()
78 		return ret < 0 ? ret : -EIO;  in shtc1_update_values()
87 	if (!data->setup.blocking_io)  in shtc1_update_values()
88 		usleep_range(data->nonblocking_wait_time,  in shtc1_update_values()
89 			     data->nonblocking_wait_time + 1000);  in shtc1_update_values()
93 		dev_err(&client->dev, "failed to read values: %d\n", ret);  in shtc1_update_values()
94 		return ret < 0 ? ret : -EIO;  in shtc1_update_values()
104 	struct i2c_client *client = data->client;  in shtc1_update_client()
109 	mutex_lock(&data->update_lock);  in shtc1_update_client()
111 	if (time_after(jiffies, data->last_updated + HZ / 10) || !data->valid) {  in shtc1_update_client()
118 		 * T = -45 + 175 * ST / 2^16  in shtc1_update_client()
124 		data->temperature = ((21875 * val) >> 13) - 45000;  in shtc1_update_client()
126 		data->humidity = ((12500 * val) >> 13);  in shtc1_update_client()
128 		data->last_updated = jiffies;  in shtc1_update_client()
129 		data->valid = true;  in shtc1_update_client()
133 	mutex_unlock(&data->update_lock);  in shtc1_update_client()
146 	return sprintf(buf, "%d\n", data->temperature);  in temp1_input_show()
156 	return sprintf(buf, "%d\n", data->humidity);  in humidity1_input_show()
172 	if (data->setup.high_precision) {  in shtc1_select_command()
173 		data->command = data->setup.blocking_io ?  in shtc1_select_command()
176 		data->nonblocking_wait_time = (data->chip == shtc1) ?  in shtc1_select_command()
180 		data->command = data->setup.blocking_io ?  in shtc1_select_command()
183 		data->nonblocking_wait_time = (data->chip == shtc1) ?  in shtc1_select_command()
198 	enum shtcx_chips chip = i2c_match_id(shtc1_id, client)->driver_data;  in shtc1_probe()
199 	struct i2c_adapter *adap = client->adapter;  in shtc1_probe()
200 	struct device *dev = &client->dev;  in shtc1_probe()
201 	struct device_node *np = dev->of_node;  in shtc1_probe()
205 		return -ENODEV;  in shtc1_probe()
211 		return ret < 0 ? ret : -ENODEV;  in shtc1_probe()
216 		return -ENODEV;  in shtc1_probe()
223 			return -ENODEV;  in shtc1_probe()
227 		return -ENODEV;  in shtc1_probe()
232 		return -ENOMEM;  in shtc1_probe()
234 	data->setup.blocking_io = false;  in shtc1_probe()
235 	data->setup.high_precision = true;  in shtc1_probe()
236 	data->client = client;  in shtc1_probe()
237 	data->chip = chip;  in shtc1_probe()
240 		data->setup.blocking_io = of_property_read_bool(np, "sensirion,blocking-io");  in shtc1_probe()
241 		data->setup.high_precision = !of_property_read_bool(np, "sensicon,low-precision");  in shtc1_probe()
243 		if (client->dev.platform_data)  in shtc1_probe()
244 			data->setup = *(struct shtc1_platform_data *)dev->platform_data;  in shtc1_probe()
248 	mutex_init(&data->update_lock);  in shtc1_probe()
251 							   client->name,  in shtc1_probe()