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authorIrina Tirdea2015-08-12 17:31:34 +0300
committerWolfram Sang2015-08-24 14:05:20 +0200
commit2cd9fbd0ed5ef12bf550c06126ebbe720574fc0e (patch)
tree4760471d7368b66c7a8b9445a0e3c18c4fa07d8f /drivers/misc
parent01eef96e37d77cd89156e5f51aab81a9d5c96539 (diff)
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/eeprom/at24.c37
1 files changed, 6 insertions, 31 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 2b254f3a1154..c6cb7f8f325e 100644
--- 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;