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authorJean Delvare <khali@linux-fr.org>2006-01-18 23:14:55 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2006-03-23 14:21:51 -0800
commit7656032b904b936eca65a41afa1f2b3603195657 (patch)
tree13144edd4480448c901d9ae8cfb92f882c29c009 /drivers/i2c/i2c-core.c
parent93766d2de6a3f7eead3fda57fd4638b90d6691fa (diff)
[PATCH] i2c: Speed up block transfers
Speed up i2c_smbus_write_block_data and i2c_smbus_read_i2c_block_data a bit by using memcpy instead of an explicit loop. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/i2c/i2c-core.c')
-rw-r--r--drivers/i2c/i2c-core.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 97334433e53..2b0c555aa01 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -920,12 +920,11 @@ s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command,
u8 length, u8 *values)
{
union i2c_smbus_data data;
- int i;
+
if (length > I2C_SMBUS_BLOCK_MAX)
length = I2C_SMBUS_BLOCK_MAX;
- for (i = 1; i <= length; i++)
- data.block[i] = values[i-1];
data.block[0] = length;
+ memcpy(&data.block[1], values, length);
return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
I2C_SMBUS_WRITE,command,
I2C_SMBUS_BLOCK_DATA,&data);
@@ -935,16 +934,14 @@ s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command,
s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, u8 *values)
{
union i2c_smbus_data data;
- int i;
+
if (i2c_smbus_xfer(client->adapter,client->addr,client->flags,
I2C_SMBUS_READ,command,
I2C_SMBUS_I2C_BLOCK_DATA,&data))
return -1;
- else {
- for (i = 1; i <= data.block[0]; i++)
- values[i-1] = data.block[i];
- return data.block[0];
- }
+
+ memcpy(values, &data.block[1], data.block[0]);
+ return data.block[0];
}
s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, u8 command,