1 // SPDX-License-Identifier: GPL-2.0-only
32 #include <linux/i2c.h>
37 #include <linux/hwmon-sysfs.h>
63 	dev_dbg(dev, "ds1682_show() called on %s\n", attr->attr.name);  in ds1682_show()
66 	rc = i2c_smbus_read_i2c_block_data(client, sattr->index, sattr->nr,  in ds1682_show()
69 		return -EIO;  in ds1682_show()
73 	if (sattr->index == DS1682_REG_ELAPSED) {  in ds1682_show()
76 		/* Detect and retry when a tick occurs mid-read */  in ds1682_show()
78 			rc = i2c_smbus_read_i2c_block_data(client, sattr->index,  in ds1682_show()
79 							   sattr->nr,  in ds1682_show()
82 				return -EIO;  in ds1682_show()
86 			retries--;  in ds1682_show()
94 	return sprintf(buf, "%llu\n", (sattr->nr == 4) ? (val * 250) : val);  in ds1682_show()
98 			    const char *buf, size_t count)  in ds1682_store()  argument
106 	dev_dbg(dev, "ds1682_store() called on %s\n", attr->attr.name);  in ds1682_store()
112 		return -EINVAL;  in ds1682_store()
116 	 * resolution, scale input down to quarter-seconds */  in ds1682_store()
117 	if (sattr->nr == 4)  in ds1682_store()
122 	rc = i2c_smbus_write_i2c_block_data(client, sattr->index, sattr->nr,  in ds1682_store()
126 			sattr->index, sattr->nr);  in ds1682_store()
127 		return -EIO;  in ds1682_store()
130 	return count;  in ds1682_store()
157 				  char *buf, loff_t off, size_t count)  in ds1682_eeprom_read()  argument
162 	dev_dbg(&client->dev, "ds1682_eeprom_read(p=%p, off=%lli, c=%zi)\n",  in ds1682_eeprom_read()
163 		buf, off, count);  in ds1682_eeprom_read()
166 					   count, buf);  in ds1682_eeprom_read()
168 		return -EIO;  in ds1682_eeprom_read()
170 	return count;  in ds1682_eeprom_read()
175 				   char *buf, loff_t off, size_t count)  in ds1682_eeprom_write()  argument
179 	dev_dbg(&client->dev, "ds1682_eeprom_write(p=%p, off=%lli, c=%zi)\n",  in ds1682_eeprom_write()
180 		buf, off, count);  in ds1682_eeprom_write()
184 					   count, buf) < 0)  in ds1682_eeprom_write()
185 		return -EIO;  in ds1682_eeprom_write()
187 	return count;  in ds1682_eeprom_write()
208 	if (!i2c_check_functionality(client->adapter,  in ds1682_probe()
210 		dev_err(&client->dev, "i2c bus does not support the ds1682\n");  in ds1682_probe()
211 		rc = -ENODEV;  in ds1682_probe()
215 	rc = sysfs_create_group(&client->dev.kobj, &ds1682_group);  in ds1682_probe()
219 	rc = sysfs_create_bin_file(&client->dev.kobj, &ds1682_eeprom_attr);  in ds1682_probe()
226 	sysfs_remove_group(&client->dev.kobj, &ds1682_group);  in ds1682_probe()
233 	sysfs_remove_bin_file(&client->dev.kobj, &ds1682_eeprom_attr);  in ds1682_remove()
234 	sysfs_remove_group(&client->dev.kobj, &ds1682_group);  in ds1682_remove()
242 MODULE_DEVICE_TABLE(i2c, ds1682_id);