eeprom: at24: remove now unneeded smbus-related code

Remove remaining now unneeded code dealing with SMBUS details.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 8800a38..3fd26d7 100644 (file)
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -513,8 +513,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
        struct at24_platform_data chip;
        kernel_ulong_t magic = 0;
        bool writable;
-       int use_smbus = 0;
-       int use_smbus_write = 0;
        struct at24_data *at24;
        int err;
        unsigned i, num_addresses;
@@ -576,33 +574,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
        if (chip.flags & AT24_FLAG_MAC && chip.byte_len == 4)
                chip.byte_len = 6;
 
-       /* Use I2C operations unless we're stuck with SMBus extensions. */
-       if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
-               if (chip.flags & AT24_FLAG_ADDR16)
-                       return -EPFNOSUPPORT;
-
-               if (i2c_check_functionality(client->adapter,
-                               I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
-                       use_smbus = I2C_SMBUS_I2C_BLOCK_DATA;
-               } else if (i2c_check_functionality(client->adapter,
-                               I2C_FUNC_SMBUS_READ_WORD_DATA)) {
-                       use_smbus = I2C_SMBUS_WORD_DATA;
-               } else if (i2c_check_functionality(client->adapter,
-                               I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
-                       use_smbus = I2C_SMBUS_BYTE_DATA;
-               } else {
-                       return -EPFNOSUPPORT;
-               }
-
-               if (i2c_check_functionality(client->adapter,
-                               I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
-                       use_smbus_write = I2C_SMBUS_I2C_BLOCK_DATA;
-               } else if (i2c_check_functionality(client->adapter,
-                               I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
-                       use_smbus_write = I2C_SMBUS_BYTE_DATA;
-                       chip.page_size = 1;
-               }
-       }
+       if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
+           !i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_WRITE_I2C_BLOCK))
+               chip.page_size = 1;
 
        if (chip.flags & AT24_FLAG_TAKE8ADDR)
                num_addresses = 8;
@@ -638,19 +613,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
        writable = !(chip.flags & AT24_FLAG_READONLY);
        if (writable) {
-               if (!use_smbus || use_smbus_write) {
-
-                       unsigned write_max = chip.page_size;
-
-                       if (write_max > io_limit)
-                               write_max = io_limit;
-                       if (use_smbus && write_max > I2C_SMBUS_BLOCK_MAX)
-                               write_max = I2C_SMBUS_BLOCK_MAX;
-                       at24->write_max = write_max;
-               } else {
-                       dev_warn(&client->dev,
-                               "cannot write due to controller restrictions.");
-               }
+               at24->write_max = min_t(unsigned int, chip.page_size, io_limit);
+               if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
+                   at24->write_max > I2C_SMBUS_BLOCK_MAX)
+                       at24->write_max = I2C_SMBUS_BLOCK_MAX;
        }
 
        /* use dummy devices for multiple-address chips */
@@ -712,12 +678,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
        dev_info(&client->dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
                chip.byte_len, client->name,
                writable ? "writable" : "read-only", at24->write_max);
-       if (use_smbus == I2C_SMBUS_WORD_DATA ||
-           use_smbus == I2C_SMBUS_BYTE_DATA) {
-               dev_notice(&client->dev, "Falling back to %s reads, "
-                          "performance will suffer\n", use_smbus ==
-                          I2C_SMBUS_WORD_DATA ? "word" : "byte");
-       }
 
        /* export data to kernel code */
        if (chip.setup)