diff options
| author | Jean Delvare <khali@linux-fr.org> | 2009-12-06 17:06:29 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2009-12-06 17:06:29 +0100 |
| commit | 38f41f282f1f88b4038f019de51cb95984e569d5 (patch) | |
| tree | d885feffa6639bfb8824c4e7a68135ceed436fe4 | |
| parent | 4710317891e4824ce1510a6b5066abbd3e917750 (diff) | |
i2c-stub: Allow user to disable some commands
Add a module parameter to override the functionality bitfield. This
lets the user disable some commands. This can be used to force a chip
driver to take different code paths.
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 | 8 |
2 files changed, 12 insertions, 2 deletions
diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub index d9c383b30925..326d1ee81e0e 100644 --- a/Documentation/i2c/i2c-stub +++ b/Documentation/i2c/i2c-stub @@ -33,6 +33,12 @@ PARAMETERS: int chip_addr[10]: The SMBus addresses to emulate chips at. +unsigned long functionality: + Functionality override, to disable some commands. See I2C_FUNC_* + constants in <linux/i2c.h> for the suitable values. For example, + value 0x1f0000 would only enable the quick, byte and byte data + commands. + CAVEATS: If your target driver polls some byte or word waiting for it to change, the diff --git a/drivers/i2c/busses/i2c-stub.c b/drivers/i2c/busses/i2c-stub.c index 52ebeda1a64b..0c770eabe85e 100644 --- a/drivers/i2c/busses/i2c-stub.c +++ b/drivers/i2c/busses/i2c-stub.c @@ -35,6 +35,10 @@ module_param_array(chip_addr, ushort, NULL, S_IRUGO); MODULE_PARM_DESC(chip_addr, "Chip addresses (up to 10, between 0x03 and 0x77)"); +static unsigned long functionality = ~0UL; +module_param(functionality, ulong, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(functionality, "Override functionality bitfield"); + struct stub_chip { u8 pointer; u16 words[256]; /* Byte operations use the LSB as per SMBus @@ -152,9 +156,9 @@ 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 | + return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | - I2C_FUNC_SMBUS_I2C_BLOCK; + I2C_FUNC_SMBUS_I2C_BLOCK) & functionality; } static const struct i2c_algorithm smbus_algorithm = { |