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Commit b86a1bc8 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

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: default avatarJean Delvare <khali@linux-fr.org>
parent 7d054817

drivers/i2c/i2c-core.c

+16 −0
Original line number Diff line number Diff line
@@ -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)

{

include/linux/i2c.h

+3 −0
Original line number Diff line number Diff line
@@ -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);