i2c: Convert the eeprom driver to a new-style i2c driver
The new-style eeprom driver implements the optional detect() callback
to cover the use cases of the legacy driver.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/i2c/chips/eeprom.c b/drivers/i2c/chips/eeprom.c
index 373ea8d..2c27193 100644
--- a/drivers/i2c/chips/eeprom.c
+++ b/drivers/i2c/chips/eeprom.c
@@ -47,7 +47,6 @@
/* Each client has this additional data */
struct eeprom_data {
- struct i2c_client client;
struct mutex update_lock;
u8 valid; /* bitfield, bit!=0 if slice is valid */
unsigned long last_updated[8]; /* In jiffies, 8 slices */
@@ -56,19 +55,6 @@
};
-static int eeprom_attach_adapter(struct i2c_adapter *adapter);
-static int eeprom_detect(struct i2c_adapter *adapter, int address, int kind);
-static int eeprom_detach_client(struct i2c_client *client);
-
-/* This is the driver that will be inserted */
-static struct i2c_driver eeprom_driver = {
- .driver = {
- .name = "eeprom",
- },
- .attach_adapter = eeprom_attach_adapter,
- .detach_client = eeprom_detach_client,
-};
-
static void eeprom_update_client(struct i2c_client *client, u8 slice)
{
struct eeprom_data *data = i2c_get_clientdata(client);
@@ -148,25 +134,17 @@
.read = eeprom_read,
};
-static int eeprom_attach_adapter(struct i2c_adapter *adapter)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int eeprom_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info)
{
- if (!(adapter->class & (I2C_CLASS_DDC | I2C_CLASS_SPD)))
- return 0;
- return i2c_probe(adapter, &addr_data, eeprom_detect);
-}
-
-/* This function is called by i2c_probe */
-static int eeprom_detect(struct i2c_adapter *adapter, int address, int kind)
-{
- struct i2c_client *client;
- struct eeprom_data *data;
- int err = 0;
+ struct i2c_adapter *adapter = client->adapter;
/* EDID EEPROMs are often 24C00 EEPROMs, which answer to all
addresses 0x50-0x57, but we only care about 0x50. So decline
attaching to addresses >= 0x51 on DDC buses */
- if (!(adapter->class & I2C_CLASS_SPD) && address >= 0x51)
- goto exit;
+ if (!(adapter->class & I2C_CLASS_SPD) && client->addr >= 0x51)
+ return -ENODEV;
/* There are four ways we can read the EEPROM data:
(1) I2C block reads (faster, but unsupported by most adapters)
@@ -177,32 +155,33 @@
because all known adapters support one of the first two. */
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA)
&& !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK))
- goto exit;
+ return -ENODEV;
+
+ strlcpy(info->type, "eeprom", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int eeprom_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct eeprom_data *data;
+ int err;
if (!(data = kzalloc(sizeof(struct eeprom_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- client = &data->client;
memset(data->data, 0xff, EEPROM_SIZE);
i2c_set_clientdata(client, data);
- client->addr = address;
- client->adapter = adapter;
- client->driver = &eeprom_driver;
-
- /* Fill in the remaining client fields */
- strlcpy(client->name, "eeprom", I2C_NAME_SIZE);
mutex_init(&data->update_lock);
data->nature = UNKNOWN;
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(client)))
- goto exit_kfree;
-
/* Detect the Vaio nature of EEPROMs.
We use the "PCG-" or "VGN-" prefix as the signature. */
- if (address == 0x57
+ if (client->addr == 0x57
&& i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
char name[4];
@@ -221,33 +200,42 @@
/* create the sysfs eeprom file */
err = sysfs_create_bin_file(&client->dev.kobj, &eeprom_attr);
if (err)
- goto exit_detach;
+ goto exit_kfree;
return 0;
-exit_detach:
- i2c_detach_client(client);
exit_kfree:
kfree(data);
exit:
return err;
}
-static int eeprom_detach_client(struct i2c_client *client)
+static int eeprom_remove(struct i2c_client *client)
{
- int err;
-
sysfs_remove_bin_file(&client->dev.kobj, &eeprom_attr);
-
- err = i2c_detach_client(client);
- if (err)
- return err;
-
kfree(i2c_get_clientdata(client));
return 0;
}
+static const struct i2c_device_id eeprom_id[] = {
+ { "eeprom", 0 },
+ { }
+};
+
+static struct i2c_driver eeprom_driver = {
+ .driver = {
+ .name = "eeprom",
+ },
+ .probe = eeprom_probe,
+ .remove = eeprom_remove,
+ .id_table = eeprom_id,
+
+ .class = I2C_CLASS_DDC | I2C_CLASS_SPD,
+ .detect = eeprom_detect,
+ .address_data = &addr_data,
+};
+
static int __init eeprom_init(void)
{
return i2c_add_driver(&eeprom_driver);