i2c: slave-eeprom: Make it possible to pre-load eeprom data
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Message ID 1567781706-2191-1-git-send-email-bjorn.ardo@axis.com
State New
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Series
  • i2c: slave-eeprom: Make it possible to pre-load eeprom data
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Commit Message

Björn Ardö Sept. 6, 2019, 2:55 p.m. UTC
If the slave eeprom has a "firmware-name" in devicetree, then
pre-load the data in the eeprom with this file.

Signed-off-by: Björn Ardö <bjorn.ardo@axis.com>
---
 drivers/i2c/i2c-slave-eeprom.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

Patch
diff mbox series

diff --git a/drivers/i2c/i2c-slave-eeprom.c b/drivers/i2c/i2c-slave-eeprom.c
index db9763c..40e7d48 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 +121,21 @@  static ssize_t i2c_slave_eeprom_bin_write(struct file *filp, struct kobject *kob
 	return count;
 }
 
+static int i2c_slave_preload_eeprom_data(struct eeprom_data *eeprom, struct i2c_client *client, unsigned int size)
+{
+	if (client->dev.of_node) {
+		const struct firmware *fw;
+		const char *eeprom_data;
+		if (!of_property_read_string(client->dev.of_node, "firmware-name", &eeprom_data)) {
+			int ret = request_firmware_into_buf(&fw, eeprom_data, &client->dev, eeprom->buffer, size);
+			if (ret)
+				return ret;
+			release_firmware(fw);
+		}
+	}
+	return 0;
+}
+
 static int i2c_slave_eeprom_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	struct eeprom_data *eeprom;
@@ -138,6 +154,10 @@  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_preload_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;