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i2c-stub: Implement I2C block support 

This is required to test some drivers, for example at24.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2009-12-06 17:06:28 +01:00
parent 69b0089a67
commit 4710317891
2 changed files with 29 additions and 5 deletions
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6
Documentation/i2c/i2c-stub
View File

@ -2,9 +2,9 @@ MODULE: i2c-stub
DESCRIPTION:
This module is a very simple fake I2C/SMBus driver. It implements four
types of SMBus commands: write quick, (r/w) byte, (r/w) byte data, and
(r/w) word data.
This module is a very simple fake I2C/SMBus driver. It implements five
types of SMBus commands: write quick, (r/w) byte, (r/w) byte data, (r/w)
word data, and (r/w) I2C block data.
You need to provide chip addresses as a module parameter when loading this
driver, which will then only react to SMBus commands to these addresses.

28
drivers/i2c/busses/i2c-stub.c
View File

@ -48,7 +48,7 @@ static s32 stub_xfer(struct i2c_adapter * adap, u16 addr, unsigned short flags,
char read_write, u8 command, int size, union i2c_smbus_data * data)
{
s32 ret;
int i;
int i, len;
struct stub_chip *chip = NULL;
/* Search for the right chip */
@ -118,6 +118,29 @@ static s32 stub_xfer(struct i2c_adapter * adap, u16 addr, unsigned short flags,
ret = 0;
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
len = data->block[0];
if (read_write == I2C_SMBUS_WRITE) {
for (i = 0; i < len; i++) {
chip->words[command + i] &= 0xff00;
chip->words[command + i] |= data->block[1 + i];
}
dev_dbg(&adap->dev, "i2c block data - addr 0x%02x, "
"wrote %d bytes at 0x%02x.\n",
addr, len, command);
} else {
for (i = 0; i < len; i++) {
data->block[1 + i] =
chip->words[command + i] & 0xff;
}
dev_dbg(&adap->dev, "i2c block data - addr 0x%02x, "
"read %d bytes at 0x%02x.\n",
addr, len, command);
}
ret = 0;
break;
default:
dev_dbg(&adap->dev, "Unsupported I2C/SMBus command\n");
ret = -EOPNOTSUPP;
@ -130,7 +153,8 @@ static s32 stub_xfer(struct i2c_adapter * adap, u16 addr, unsigned short flags,
static u32 stub_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA;
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK;
}
static const struct i2c_algorithm smbus_algorithm = {