Commit e804f0a7 authored by Björn Ardö's avatar Björn Ardö Committed by Wolfram Sang
Browse files

i2c: slave-eeprom: Make it possible to pre-load eeprom data 



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: default avatarPatrick Williams <patrick@stwcx.xyz>
Signed-off-by: default avatarBjörn Ardö <bjorn.ardo@axis.com>
[wsa: some cosmetic changes]
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent e42688ed

drivers/i2c/i2c-slave-eeprom.c

+25 −0
Original line number Diff line number Diff line
@@ -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 ret = device_property_read_string(&client->dev, "firmware-name", &eeprom_data);



	if (!ret) {

		ret = request_firmware_into_buf(&fw, eeprom_data, &client->dev,

						eeprom->buffer, size);

		if (ret)

			return ret;

		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;