eeprom: at24: use i2c_smbus_read_i2c_block_data_or_emulated

For i2c busses that support only SMBUS extensions, the eeprom at24
driver reads data from the device using the SMBus block, word or byte
read protocols depending on availability.

Replace the block read emulation from the driver with the
i2c_smbus_read_i2c_block_data_or_emulated call from i2c core.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 2b254f3a1154e641628dc9e92a84572f4a4174f9..c6cb7f8f325e91c530656b4d1eac709c82f8212e 100644 (file)
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -186,19 +186,11 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf,
        if (count > io_limit)
                count = io_limit;
 
-       switch (at24->use_smbus) {
-       case I2C_SMBUS_I2C_BLOCK_DATA:
+       if (at24->use_smbus) {
                /* Smaller eeproms can work given some SMBus extension calls */
                if (count > I2C_SMBUS_BLOCK_MAX)
                        count = I2C_SMBUS_BLOCK_MAX;
-               break;
-       case I2C_SMBUS_WORD_DATA:
-               count = 2;
-               break;
-       case I2C_SMBUS_BYTE_DATA:
-               count = 1;
-               break;
-       default:
+       } else {
                /*
                 * When we have a better choice than SMBus calls, use a
                 * combined I2C message. Write address; then read up to
@@ -229,27 +221,10 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf,
        timeout = jiffies + msecs_to_jiffies(write_timeout);
        do {
                read_time = jiffies;
-               switch (at24->use_smbus) {
-               case I2C_SMBUS_I2C_BLOCK_DATA:
-                       status = i2c_smbus_read_i2c_block_data(client, offset,
-                                       count, buf);
-                       break;
-               case I2C_SMBUS_WORD_DATA:
-                       status = i2c_smbus_read_word_data(client, offset);
-                       if (status >= 0) {
-                               buf[0] = status & 0xff;
-                               buf[1] = status >> 8;
-                               status = count;
-                       }
-                       break;
-               case I2C_SMBUS_BYTE_DATA:
-                       status = i2c_smbus_read_byte_data(client, offset);
-                       if (status >= 0) {
-                               buf[0] = status;
-                               status = count;
-                       }
-                       break;
-               default:
+               if (at24->use_smbus) {
+                       status = i2c_smbus_read_i2c_block_data_or_emulated(client, offset,
+                                                                          count, buf);
+               } else {
                        status = i2c_transfer(client->adapter, msg, 2);
                        if (status == 2)
                                status = count;