diff options
| -rw-r--r-- | drivers/i2c/i2c-core.c | 16 | ||||
| -rw-r--r-- | include/linux/i2c.h | 3 |
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index a58f89a6418..64f8e56d300 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -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); +/* 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, u8 length, const u8 *values) { diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 3fe2ad37da3..cae7d618030 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -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_write_word_data(struct i2c_client * client, 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, u8 command, u8 length, const u8 *values); |