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Subject[PATCHv3] i2c: slave-eeprom: Make it possible to pre-load eeprom data
Date
If the slave eeprom has a "firmware-name" in devicetree, then
pre-load the data in the eeprom with this file. Otherwise we
init the eeprom with 0xFF.

Signed-off-by: Björn Ardö <bjorn.ardo@axis.com>
---
drivers/i2c/i2c-slave-eeprom.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/drivers/i2c/i2c-slave-eeprom.c b/drivers/i2c/i2c-slave-eeprom.c
index cb415b10642f..b425cefea92c 100644
--- a/drivers/i2c/i2c-slave-eeprom.c
+++ b/drivers/i2c/i2c-slave-eeprom.c
@@ -18,6 +18,7 @@
*/

#include <linux/bitfield.h>
+#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
@@ -120,6 +121,26 @@ static ssize_t i2c_slave_eeprom_bin_write(struct file *filp, struct kobject *kob
return count;
}

+static int i2c_slave_init_eeprom_data(struct eeprom_data *eeprom, struct i2c_client *client,
+ unsigned int size)
+{
+ const struct firmware *fw;
+ const char *eeprom_data;
+ int error = device_property_read_string(&client->dev, "firmware-name", &eeprom_data);
+
+ if (!error) {
+ error = request_firmware_into_buf(&fw, eeprom_data, &client->dev,
+ eeprom->buffer, size);
+ if (error)
+ return error;
+ release_firmware(fw);
+ } else {
+ /* An empty eeprom typically has all bits set to 1 */
+ memset(eeprom->buffer, 0xFF, size);
+ }
+ return 0;
+}
+
static int i2c_slave_eeprom_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct eeprom_data *eeprom;
@@ -138,6 +159,10 @@ static int i2c_slave_eeprom_probe(struct i2c_client *client, const struct i2c_de
spin_lock_init(&eeprom->buffer_lock);
i2c_set_clientdata(client, eeprom);

+ ret = i2c_slave_init_eeprom_data(eeprom, client, size);
+ if (ret)
+ return ret;
+
sysfs_bin_attr_init(&eeprom->bin);
eeprom->bin.attr.name = "slave-eeprom";
eeprom->bin.attr.mode = S_IRUSR | S_IWUSR;
--
2.11.0
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