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misc: ds1682: Add NVMEM support

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Add NVMEM support for the internal EEPROM.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Link: https://lore.kernel.org/r/20240315213540.1682964-1-sean.anderson@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Anderson 2024-03-15 17:35:40 -04:00 committed by Greg Kroah-Hartman
parent ad76f3e8f5
commit 115ee55351
1 changed files with 37 additions and 0 deletions
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37
drivers/misc/ds1682.c
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@ -32,6 +32,7 @@
#include <linux/i2c.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/nvmem-provider.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <linux/hwmon-sysfs.h>
@ -197,11 +198,43 @@ static const struct bin_attribute ds1682_eeprom_attr = {
.write = ds1682_eeprom_write,
};
static int ds1682_nvmem_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct i2c_client *client = priv;
int ret;
ret = i2c_smbus_read_i2c_block_data(client, DS1682_REG_EEPROM + offset,
bytes, val);
return ret < 0 ? ret : 0;
}
static int ds1682_nvmem_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct i2c_client *client = priv;
int ret;
ret = i2c_smbus_write_i2c_block_data(client, DS1682_REG_EEPROM + offset,
bytes, val);
return ret < 0 ? ret : 0;
}
/*
* Called when a ds1682 device is matched with this driver
*/
static int ds1682_probe(struct i2c_client *client)
{
struct nvmem_config config = {
.dev = &client->dev,
.owner = THIS_MODULE,
.type = NVMEM_TYPE_EEPROM,
.reg_read = ds1682_nvmem_read,
.reg_write = ds1682_nvmem_write,
.size = DS1682_EEPROM_SIZE,
.priv = client,
};
struct nvmem_device *nvmem;
int rc;
if (!i2c_check_functionality(client->adapter,
@ -211,6 +244,10 @@ static int ds1682_probe(struct i2c_client *client)
goto exit;
}
nvmem = devm_nvmem_register(&client->dev, &config);
if (IS_ENABLED(CONFIG_NVMEM) && IS_ERR(nvmem))
return PTR_ERR(nvmem);
rc = sysfs_create_group(&client->dev.kobj, &ds1682_group);
if (rc)
goto exit;