SMBus Host Notify allows a slave device to act as a master on a bus to notify the host of an interrupt. On Intel chipsets, the functionality is directly implemented in the firmware. We just need to export a function to call .alert() on the proper device driver. i2c_handle_smbus_host_notify() behaves like i2c_handle_smbus_alert(). When called, it schedules a task that will be able to sleep to go through the list of devices attached to the adapter. The current implementation allows one Host Notification to be scheduled while an other is running.
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| @@ -102,6 +102,7 @@ struct i2c_msg { · 101 unmodified lines | ||
| 102 | 102 | #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 |
| 103 | 103 | #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ |
| 104 | 104 | #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ |
| 105 | +#define I2C_FUNC_SMBUS_HOST_NOTIFY 0x10000000 | |
| 105 | 106 | |
| 106 | 107 | #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ |
| 107 | 108 | I2C_FUNC_SMBUS_WRITE_BYTE) |