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authorJean Delvare <khali@linux-fr.org>2009-12-06 17:06:29 +0100
committerJean Delvare <khali@linux-fr.org>2009-12-06 17:06:29 +0100
commit38f41f282f1f88b4038f019de51cb95984e569d5 (patch)
treed885feffa6639bfb8824c4e7a68135ceed436fe4 /drivers/i2c
parent4710317891e4824ce1510a6b5066abbd3e917750 (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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-stub.c8
1 files changed, 6 insertions, 2 deletions
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 = {