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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>
This commit is contained in:
Bartosz Golaszewski 2016-06-06 10:48:46 +02:00 committed by Wolfram Sang
parent 2da78ac3ba
commit 318aa9c66b
1 changed files with 9 additions and 2 deletions
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11
drivers/misc/eeprom/at24.c
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@ -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) {