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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2016-06-06 10:48:46 +0200
committerWolfram Sang <wsa@the-dreams.de>2016-07-17 19:41:54 +0200
commit318aa9c66b337924f96caffab689553e1875aadf (patch)
tree180f0ad46998ed60f45d763d718a1ee49a166649 /drivers/misc
parent2da78ac3ba577e0e4c9f13cbfce51db5a74f7ba3 (diff)
downloadlinux-318aa9c66b337924f96caffab689553e1875aadf.tar.bz2
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/eeprom/at24.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 564a20113377..0621937e7b3a 100644
--- 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) {