eeprom: at24: call read/write functions via function pointers

The first step in simplifying the read and write functions is to call
them via function pointers stored in at24_data. When we eventually
split the routines into smaller ones (depending on whether they use
smbus or i2c operations) we'll simply assign them to said pointers
instead of checking the flags at runtime every time we read/write.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.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 564a201133771babe47628cb931a7ac7a85b13f7..0621937e7b3a877b97bbf0f96d69054fd575eb32 100644 (file)
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -58,6 +58,10 @@ struct at24_data {
        int use_smbus;
        int use_smbus_write;
 
+       ssize_t (*read_func)(struct at24_data *, char *, unsigned int, size_t);
+       ssize_t (*write_func)(struct at24_data *,
+                             const char *, unsigned int, size_t);
+
        /*
         * Lock protects against activities from other Linux tasks,
         * but not from changes by other I2C masters.
@@ -351,7 +355,7 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
        while (count) {
                int     status;
 
-               status = at24_eeprom_read(at24, buf, off, count);
+               status = at24->read_func(at24, buf, off, count);
                if (status < 0) {
                        mutex_unlock(&at24->lock);
                        return status;
@@ -383,7 +387,7 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
        while (count) {
                int status;
 
-               status = at24_eeprom_write(at24, buf, off, count);
+               status = at24->write_func(at24, buf, off, count);
                if (status < 0) {
                        mutex_unlock(&at24->lock);
                        return status;
@@ -518,6 +522,9 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
        at24->chip = chip;
        at24->num_addresses = num_addresses;
 
+       at24->read_func = at24_eeprom_read;
+       at24->write_func = at24_eeprom_write;
+
        writable = !(chip.flags & AT24_FLAG_READONLY);
        if (writable) {
                if (!use_smbus || use_smbus_write) {