diff options
| author | Jean Delvare <khali@linux-fr.org> | 2009-12-06 17:06:28 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2009-12-06 17:06:28 +0100 |
| commit | 4710317891e4824ce1510a6b5066abbd3e917750 (patch) | |
| tree | 497e78c7b78485ade6d5cb84206a62903f1919a9 | |
| parent | 69b0089a6750a0435570df3ba8456c77b352af55 (diff) | |
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>
| -rw-r--r-- | Documentation/i2c/i2c-stub | 6 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-stub.c | 28 |
2 files changed, 29 insertions, 5 deletions
diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub index 0d8be1c20c16..d9c383b30925 100644 --- a/Documentation/i2c/i2c-stub +++ b/Documentation/i2c/i2c-stub @@ -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. diff --git a/drivers/i2c/busses/i2c-stub.c b/drivers/i2c/busses/i2c-stub.c index 1b7b2af94036..52ebeda1a64b 100644 --- a/drivers/i2c/busses/i2c-stub.c +++ b/drivers/i2c/busses/i2c-stub.c @@ -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 = { |