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i2c: Restore i2c_smbus_process_call function

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Restore the i2c_smbus_process_call() as one driver (for the
Micronas MAP5401) will need it soon.

[JD: Update documentation accordingly.]

Signed-off-by: Prakash Mortha <pmortha@escient.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Prakash Mortha 2008-10-14 17:30:06 +02:00 committed by Jean Delvare
parent a10f9e7caf
commit 596c88f460
3 changed files with 26 additions and 4 deletions
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4
Documentation/i2c/smbus-protocol
View file

@ -109,8 +109,8 @@ specified through the Comm byte.
S Addr Wr [A] Comm [A] DataLow [A] DataHigh [A] P S Addr Wr [A] Comm [A] DataLow [A] DataHigh [A] P
SMBus Process Call SMBus Process Call: i2c_smbus_process_call()
================== =============================================
This command selects a device register (through the Comm byte), sends This command selects a device register (through the Comm byte), sends
16 bits of data to it, and reads 16 bits of data in return. 16 bits of data to it, and reads 16 bits of data in return.

4
Documentation/i2c/writing-clients
View file

@ -606,6 +606,8 @@ SMBus communication
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);
extern s32 i2c_smbus_process_call(struct i2c_client *client,
u8 command, u16 value);
extern s32 i2c_smbus_read_block_data(struct i2c_client * client, extern s32 i2c_smbus_read_block_data(struct i2c_client * client,
u8 command, u8 *values); 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,
@ -621,8 +623,6 @@ These ones were removed from i2c-core because they had no users, but could
be added back later if needed: be added back later if needed:
extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value); extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value);
extern s32 i2c_smbus_process_call(struct i2c_client * client,
u8 command, u16 value);
extern s32 i2c_smbus_block_process_call(struct i2c_client *client, extern s32 i2c_smbus_block_process_call(struct i2c_client *client,
u8 command, u8 length, u8 command, u8 length,
u8 *values) u8 *values)

22
drivers/i2c/i2c-core.c
View file

@ -1687,6 +1687,28 @@ 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);
/**
* i2c_smbus_process_call - SMBus "process call" protocol
* @client: Handle to slave device
* @command: Byte interpreted by slave
* @value: 16-bit "word" being written
*
* This executes the SMBus "process call" protocol, returning negative errno
* else a 16-bit unsigned "word" received from the device.
*/
s32 i2c_smbus_process_call(struct i2c_client *client, u8 command, u16 value)
{
union i2c_smbus_data data;
int status;
data.word = value;
status = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
I2C_SMBUS_WRITE, command,
I2C_SMBUS_PROC_CALL, &data);
return (status < 0) ? status : data.word;
}
EXPORT_SYMBOL(i2c_smbus_process_call);
/** /**
* i2c_smbus_read_block_data - SMBus "block read" protocol * i2c_smbus_read_block_data - SMBus "block read" protocol
* @client: Handle to slave device * @client: Handle to slave device