1 // SPDX-License-Identifier: GPL-2.0-or-later
20 #include <linux/hwmon-sysfs.h>
72 		.data = (void *)2
76 		.data = (void *)3
80 		.data = (void *)4
84 		.data = (void *)2
88 		.data = (void *)3
111 	struct tmp421_channel channel[MAX_CHANNELS];  member
120 		temp = temp - 64 * 256;  in temp_from_raw()
127 static int tmp421_update_device(struct tmp421_data *data)  in tmp421_update_device()  argument
129 	struct i2c_client *client = data->client;  in tmp421_update_device()
133 	mutex_lock(&data->update_lock);  in tmp421_update_device()
135 	if (time_after(jiffies, data->last_updated + (HZ / 2)) ||  in tmp421_update_device()
136 	    !data->valid) {  in tmp421_update_device()
140 		data->config = ret;  in tmp421_update_device()
142 		for (i = 0; i < data->channels; i++) {  in tmp421_update_device()
146 			data->channel[i].temp = ret << 8;  in tmp421_update_device()
151 			data->channel[i].temp |= ret;  in tmp421_update_device()
153 		data->last_updated = jiffies;  in tmp421_update_device()
154 		data->valid = true;  in tmp421_update_device()
158 	mutex_unlock(&data->update_lock);  in tmp421_update_device()
161 		data->valid = false;  in tmp421_update_device()
168 static int tmp421_enable_channels(struct tmp421_data *data)  in tmp421_enable_channels()  argument
171 	struct i2c_client *client = data->client;  in tmp421_enable_channels()
172 	struct device *dev = &client->dev;  in tmp421_enable_channels()
182 	for (i = 0; i < data->channels; i++)  in tmp421_enable_channels()
183 		if (data->channel[i].enabled)  in tmp421_enable_channels()
197 		       u32 attr, int channel, long *val)  in tmp421_read()  argument
208 		if (!tmp421->channel[channel].enabled)  in tmp421_read()
209 			return -ENODATA;  in tmp421_read()
210 		*val = temp_from_raw(tmp421->channel[channel].temp,  in tmp421_read()
211 				     tmp421->config & TMP421_CONFIG_RANGE);  in tmp421_read()
214 		if (!tmp421->channel[channel].enabled)  in tmp421_read()
215 			return -ENODATA;  in tmp421_read()
220 		*val = !!(tmp421->channel[channel].temp & 0x03);  in tmp421_read()
223 		*val = tmp421->channel[channel].enabled;  in tmp421_read()
226 		return -EOPNOTSUPP;  in tmp421_read()
232 			     u32 attr, int channel, const char **str)  in tmp421_read_string()  argument
234 	struct tmp421_data *data = dev_get_drvdata(dev);  in tmp421_read_string()  local
236 	*str = data->channel[channel].label;  in tmp421_read_string()
242 			u32 attr, int channel, long val)  in tmp421_write()  argument
244 	struct tmp421_data *data = dev_get_drvdata(dev);  in tmp421_write()  local
249 		data->channel[channel].enabled = val;  in tmp421_write()
250 		ret = tmp421_enable_channels(data);  in tmp421_write()
253 	    ret = -EOPNOTSUPP;  in tmp421_write()
259 static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type,  in tmp421_is_visible()  argument
260 				 u32 attr, int channel)  in tmp421_is_visible()  argument
275 static int tmp421_init_client(struct tmp421_data *data)  in tmp421_init_client()  argument
278 	struct i2c_client *client = data->client;  in tmp421_init_client()
286 		dev_err(&client->dev,  in tmp421_init_client()
295 		dev_info(&client->dev, "Enable monitoring chip\n");  in tmp421_init_client()
299 	return tmp421_enable_channels(data);  in tmp421_init_client()
306 	struct i2c_adapter *adapter = client->adapter;  in tmp421_detect()
311 	int addr = client->addr;  in tmp421_detect()
315 		return -ENODEV;  in tmp421_detect()
319 		return -ENODEV;  in tmp421_detect()
323 		return -ENODEV;  in tmp421_detect()
327 		return -ENODEV;  in tmp421_detect()
336 			return -ENODEV;  in tmp421_detect()
341 			return -ENODEV;  in tmp421_detect()
349 			return -ENODEV;  in tmp421_detect()
353 		return -ENODEV;  in tmp421_detect()
356 	strscpy(info->type, tmp421_id[kind].name, I2C_NAME_SIZE);  in tmp421_detect()
357 	dev_info(&adapter->dev, "Detected TI %s chip at 0x%02x\n",  in tmp421_detect()
358 		 names[kind], client->addr);  in tmp421_detect()
365 				      struct tmp421_data *data)  in tmp421_probe_child_from_dt()  argument
368 	struct device *dev = &client->dev;  in tmp421_probe_child_from_dt()
379 	if (i >= data->channels) {  in tmp421_probe_child_from_dt()
381 		return -EINVAL;  in tmp421_probe_child_from_dt()
384 	of_property_read_string(child, "label", &data->channel[i].label);  in tmp421_probe_child_from_dt()
385 	if (data->channel[i].label)  in tmp421_probe_child_from_dt()
386 		data->temp_config[i] |= HWMON_T_LABEL;  in tmp421_probe_child_from_dt()
388 	data->channel[i].enabled = of_device_is_available(child);  in tmp421_probe_child_from_dt()
390 	err = of_property_read_s32(child, "ti,n-factor", &val);  in tmp421_probe_child_from_dt()
393 			dev_err(dev, "n-factor can't be set for internal channel\n");  in tmp421_probe_child_from_dt()
394 			return -EINVAL;  in tmp421_probe_child_from_dt()
397 		if (val > 127 || val < -128) {  in tmp421_probe_child_from_dt()
398 			dev_err(dev, "n-factor for channel %d invalid (%d)\n",  in tmp421_probe_child_from_dt()
400 			return -EINVAL;  in tmp421_probe_child_from_dt()
402 		i2c_smbus_write_byte_data(client, TMP421_N_FACTOR_REG_1 + i - 1,  in tmp421_probe_child_from_dt()
409 static int tmp421_probe_from_dt(struct i2c_client *client, struct tmp421_data *data)  in tmp421_probe_from_dt()  argument
411 	struct device *dev = &client->dev;  in tmp421_probe_from_dt()
412 	const struct device_node *np = dev->of_node;  in tmp421_probe_from_dt()
416 		if (strcmp(child->name, "channel"))  in tmp421_probe_from_dt()
419 		err = tmp421_probe_child_from_dt(client, child, data);  in tmp421_probe_from_dt()
436 	struct device *dev = &client->dev;  in tmp421_probe()
438 	struct tmp421_data *data;  in tmp421_probe()  local
441 	data = devm_kzalloc(dev, sizeof(struct tmp421_data), GFP_KERNEL);  in tmp421_probe()
442 	if (!data)  in tmp421_probe()
443 		return -ENOMEM;  in tmp421_probe()
445 	mutex_init(&data->update_lock);  in tmp421_probe()
446 	data->channels = (unsigned long)i2c_get_match_data(client);  in tmp421_probe()
447 	data->client = client;  in tmp421_probe()
449 	for (i = 0; i < data->channels; i++) {  in tmp421_probe()
450 		data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_ENABLE;  in tmp421_probe()
451 		data->channel[i].enabled = true;  in tmp421_probe()
454 	err = tmp421_probe_from_dt(client, data);  in tmp421_probe()
458 	err = tmp421_init_client(data);  in tmp421_probe()
462 	data->chip.ops = &tmp421_ops;  in tmp421_probe()
463 	data->chip.info = data->info;  in tmp421_probe()
465 	data->info[0] = &data->temp_info;  in tmp421_probe()
467 	data->temp_info.type = hwmon_temp;  in tmp421_probe()
468 	data->temp_info.config = data->temp_config;  in tmp421_probe()
470 	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,  in tmp421_probe()
471 							 data,  in tmp421_probe()
472 							 &data->chip,  in tmp421_probe()