diff options
Diffstat (limited to 'drivers/i2c/i2c-slave-eeprom.c')
| -rw-r--r-- | drivers/i2c/i2c-slave-eeprom.c | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/drivers/i2c/i2c-slave-eeprom.c b/drivers/i2c/i2c-slave-eeprom.c index cb415b10642f..593f2fd39d17 100644 --- a/drivers/i2c/i2c-slave-eeprom.c +++ b/drivers/i2c/i2c-slave-eeprom.c @@ -5,10 +5,9 @@ * Copyright (C) 2014 by Wolfram Sang, Sang Engineering <wsa@sang-engineering.com> * Copyright (C) 2014 by Renesas Electronics Corporation * - * Because most IP blocks can only detect one I2C slave address anyhow, this - * driver does not support simulating EEPROM types which take more than one - * address. It is prepared to simulate bigger EEPROMs with an internal 16 bit - * pointer, yet implementation is deferred until the need actually arises. + * Because most slave IP cores can only detect one I2C slave address anyhow, + * this driver does not support simulating EEPROM types which take more than + * one address. */ /* @@ -18,6 +17,7 @@ */ #include <linux/bitfield.h> +#include <linux/firmware.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/module.h> @@ -40,7 +40,7 @@ struct eeprom_data { #define I2C_SLAVE_BYTELEN GENMASK(15, 0) #define I2C_SLAVE_FLAG_ADDR16 BIT(16) #define I2C_SLAVE_FLAG_RO BIT(17) -#define I2C_SLAVE_DEVICE_MAGIC(_len, _flags) ((_flags) | (_len)) +#define I2C_SLAVE_DEVICE_MAGIC(_len, _flags) ((_flags) | ((_len) - 1)) static int i2c_slave_eeprom_slave_cb(struct i2c_client *client, enum i2c_slave_event event, u8 *val) @@ -120,24 +120,47 @@ 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; int ret; - unsigned int size = FIELD_GET(I2C_SLAVE_BYTELEN, id->driver_data); + unsigned int size = FIELD_GET(I2C_SLAVE_BYTELEN, id->driver_data) + 1; unsigned int flag_addr16 = FIELD_GET(I2C_SLAVE_FLAG_ADDR16, id->driver_data); eeprom = devm_kzalloc(&client->dev, sizeof(struct eeprom_data) + size, GFP_KERNEL); if (!eeprom) return -ENOMEM; - eeprom->idx_write_cnt = 0; eeprom->num_address_bytes = flag_addr16 ? 2 : 1; eeprom->address_mask = size - 1; eeprom->read_only = FIELD_GET(I2C_SLAVE_FLAG_RO, id->driver_data); 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; @@ -175,6 +198,8 @@ static const struct i2c_device_id i2c_slave_eeprom_id[] = { { "slave-24c32ro", I2C_SLAVE_DEVICE_MAGIC(32768 / 8, I2C_SLAVE_FLAG_ADDR16 | I2C_SLAVE_FLAG_RO) }, { "slave-24c64", I2C_SLAVE_DEVICE_MAGIC(65536 / 8, I2C_SLAVE_FLAG_ADDR16) }, { "slave-24c64ro", I2C_SLAVE_DEVICE_MAGIC(65536 / 8, I2C_SLAVE_FLAG_ADDR16 | I2C_SLAVE_FLAG_RO) }, + { "slave-24c512", I2C_SLAVE_DEVICE_MAGIC(524288 / 8, I2C_SLAVE_FLAG_ADDR16) }, + { "slave-24c512ro", I2C_SLAVE_DEVICE_MAGIC(524288 / 8, I2C_SLAVE_FLAG_ADDR16 | I2C_SLAVE_FLAG_RO) }, { } }; MODULE_DEVICE_TABLE(i2c, i2c_slave_eeprom_id); |