1 // SPDX-License-Identifier: GPL-2.0-only
32 #include <linux/i2c.h>
35 #include <linux/nvmem-provider.h>
38 #include <linux/hwmon-sysfs.h>
64 	dev_dbg(dev, "ds1682_show() called on %s\n", attr->attr.name);  in ds1682_show()
67 	rc = i2c_smbus_read_i2c_block_data(client, sattr->index, sattr->nr,  in ds1682_show()
70 		return -EIO;  in ds1682_show()
74 	if (sattr->index == DS1682_REG_ELAPSED) {  in ds1682_show()
77 		/* Detect and retry when a tick occurs mid-read */  in ds1682_show()
79 			rc = i2c_smbus_read_i2c_block_data(client, sattr->index,  in ds1682_show()
80 							   sattr->nr,  in ds1682_show()
83 				return -EIO;  in ds1682_show()
87 			retries--;  in ds1682_show()
95 	return sprintf(buf, "%llu\n", (sattr->nr == 4) ? (val * 250) : val);  in ds1682_show()
99 			    const char *buf, size_t count)  in ds1682_store()  argument
107 	dev_dbg(dev, "ds1682_store() called on %s\n", attr->attr.name);  in ds1682_store()
113 		return -EINVAL;  in ds1682_store()
117 	 * resolution, scale input down to quarter-seconds */  in ds1682_store()
118 	if (sattr->nr == 4)  in ds1682_store()
123 	rc = i2c_smbus_write_i2c_block_data(client, sattr->index, sattr->nr,  in ds1682_store()
127 			sattr->index, sattr->nr);  in ds1682_store()
128 		return -EIO;  in ds1682_store()
131 	return count;  in ds1682_store()
158 				  char *buf, loff_t off, size_t count)  in ds1682_eeprom_read()  argument
163 	dev_dbg(&client->dev, "ds1682_eeprom_read(p=%p, off=%lli, c=%zi)\n",  in ds1682_eeprom_read()
164 		buf, off, count);  in ds1682_eeprom_read()
167 					   count, buf);  in ds1682_eeprom_read()
169 		return -EIO;  in ds1682_eeprom_read()
171 	return count;  in ds1682_eeprom_read()
176 				   char *buf, loff_t off, size_t count)  in ds1682_eeprom_write()  argument
180 	dev_dbg(&client->dev, "ds1682_eeprom_write(p=%p, off=%lli, c=%zi)\n",  in ds1682_eeprom_write()
181 		buf, off, count);  in ds1682_eeprom_write()
185 					   count, buf) < 0)  in ds1682_eeprom_write()
186 		return -EIO;  in ds1682_eeprom_write()
188 	return count;  in ds1682_eeprom_write()
229 		.dev = &client->dev,  in ds1682_probe()
240 	if (!i2c_check_functionality(client->adapter,  in ds1682_probe()
242 		dev_err(&client->dev, "i2c bus does not support the ds1682\n");  in ds1682_probe()
243 		rc = -ENODEV;  in ds1682_probe()
247 	nvmem = devm_nvmem_register(&client->dev, &config);  in ds1682_probe()
251 	rc = sysfs_create_group(&client->dev.kobj, &ds1682_group);  in ds1682_probe()
255 	rc = sysfs_create_bin_file(&client->dev.kobj, &ds1682_eeprom_attr);  in ds1682_probe()
262 	sysfs_remove_group(&client->dev.kobj, &ds1682_group);  in ds1682_probe()
269 	sysfs_remove_bin_file(&client->dev.kobj, &ds1682_eeprom_attr);  in ds1682_remove()
270 	sysfs_remove_group(&client->dev.kobj, &ds1682_group);  in ds1682_remove()
277 MODULE_DEVICE_TABLE(i2c, ds1682_id);