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: Patrick Williams <patrick@stwcx.xyz> Signed-off-by: Björn Ardö <bjorn.ardo@axis.com> [wsa: some cosmetic changes] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -18,6 +18,7 @@
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*/
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#include <linux/bitfield.h>
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#include <linux/firmware.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/module.h>
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@ -120,6 +121,26 @@ static ssize_t i2c_slave_eeprom_bin_write(struct file *filp, struct kobject *kob
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return count;
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}
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static int i2c_slave_init_eeprom_data(struct eeprom_data *eeprom, struct i2c_client *client,
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unsigned int size)
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{
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const struct firmware *fw;
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const char *eeprom_data;
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int ret = device_property_read_string(&client->dev, "firmware-name", &eeprom_data);
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if (!ret) {
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ret = request_firmware_into_buf(&fw, eeprom_data, &client->dev,
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eeprom->buffer, size);
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if (ret)
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return ret;
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release_firmware(fw);
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} else {
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/* An empty eeprom typically has all bits set to 1 */
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memset(eeprom->buffer, 0xff, size);
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}
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return 0;
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}
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static int i2c_slave_eeprom_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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struct eeprom_data *eeprom;
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@ -138,6 +159,10 @@ static int i2c_slave_eeprom_probe(struct i2c_client *client, const struct i2c_de
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spin_lock_init(&eeprom->buffer_lock);
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i2c_set_clientdata(client, eeprom);
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ret = i2c_slave_init_eeprom_data(eeprom, client, size);
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if (ret)
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return ret;
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sysfs_bin_attr_init(&eeprom->bin);
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eeprom->bin.attr.name = "slave-eeprom";
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eeprom->bin.attr.mode = S_IRUSR | S_IWUSR;
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