From e804f0a78e9e43f0105e1bc3e264894b3898e970 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bj=C3=B6rn=20Ard=C3=B6?= Date: Fri, 24 Apr 2020 13:30:36 +0200 Subject: [PATCH] i2c: slave-eeprom: Make it possible to pre-load eeprom data MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Björn Ardö [wsa: some cosmetic changes] Signed-off-by: Wolfram Sang --- 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 cb415b1..f868dfc 100644 --- a/drivers/i2c/i2c-slave-eeprom.c +++ b/drivers/i2c/i2c-slave-eeprom.c @@ -18,6 +18,7 @@ */ #include +#include #include #include #include @@ -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; -- 2.7.4