diff options
Diffstat (limited to 'Documentation/i2c/i2c-stub')
| -rw-r--r-- | Documentation/i2c/i2c-stub | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub index 9cc081e6976..89e69ad3436 100644 --- a/Documentation/i2c/i2c-stub +++ b/Documentation/i2c/i2c-stub @@ -6,13 +6,14 @@ 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. -You need to provide a chip address as a module parameter when loading -this driver, which will then only react to SMBus commands to this address. +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. No hardware is needed nor associated with this module. It will accept write -quick commands to one address; it will respond to the other commands (also -to one address) by reading from or writing to an array in memory. It will -also spam the kernel logs for every command it handles. +quick commands to the specified addresses; it will respond to the other +commands (also to the specified addresses) by reading from or writing to +arrays in memory. It will also spam the kernel logs for every command it +handles. A pointer register with auto-increment is implemented for all byte operations. This allows for continuous byte reads like those supported by @@ -26,8 +27,8 @@ The typical use-case is like this: PARAMETERS: -int chip_addr: - The SMBus address to emulate a chip at. +int chip_addr[10]: + The SMBus addresses to emulate chips at. CAVEATS: @@ -41,9 +42,6 @@ If the hardware for your driver has banked registers (e.g. Winbond sensors chips) this module will not work well - although it could be extended to support that pretty easily. -Only one chip address is supported - although this module could be -extended to support more. - If you spam it hard enough, printk can be lossy. This module really wants something like relayfs. |