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i2c: Restore i2c_smbus_read_block_data 

Add back the i2c_smbus_read_block_data helper function, it is needed
by the upcoming lm93 hardware monitoring driver and possibly others.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2007-05-01 23:26:34 +02:00 committed by Jean Delvare
parent 7d054817b7
commit b86a1bc8e3
2 changed files with 19 additions and 0 deletions
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16
drivers/i2c/i2c-core.c
View File

@ -1298,6 +1298,22 @@ s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value)
} }
EXPORT_SYMBOL(i2c_smbus_write_word_data); EXPORT_SYMBOL(i2c_smbus_write_word_data);
/* Returns the number of read bytes */
s32 i2c_smbus_read_block_data(struct i2c_client *client, u8 command,
u8 *values)
{
union i2c_smbus_data data;
if (i2c_smbus_xfer(client->adapter, client->addr, client->flags,
I2C_SMBUS_READ, command,
I2C_SMBUS_BLOCK_DATA, &data))
return -1;
memcpy(values, &data.block[1], data.block[0]);
return data.block[0];
}
EXPORT_SYMBOL(i2c_smbus_read_block_data);
s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command, s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command,
u8 length, const u8 *values) u8 length, const u8 *values)
{ {

3
include/linux/i2c.h
View File

@ -82,6 +82,9 @@ extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command); extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
extern s32 i2c_smbus_write_word_data(struct i2c_client * client, extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
u8 command, u16 value); u8 command, u16 value);
/* Returns the number of read bytes */
extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
u8 command, u8 *values);
extern s32 i2c_smbus_write_block_data(struct i2c_client * client, extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
u8 command, u8 length, u8 command, u8 length,
const u8 *values); const u8 *values);