From e456cd37bc28abe47dc65189df916ac0510ac1d4 Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Thu, 9 Jun 2016 16:53:48 +0200 Subject: i2c: smbus: add SMBus Host Notify support 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. Tested-by: Andrew Duggan Signed-off-by: Benjamin Tissoires Signed-off-by: Wolfram Sang --- Documentation/i2c/smbus-protocol | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/smbus-protocol b/Documentation/i2c/smbus-protocol index 6012b12..14d4ec1 100644 --- a/Documentation/i2c/smbus-protocol +++ b/Documentation/i2c/smbus-protocol @@ -199,6 +199,12 @@ alerting device's address. [S] [HostAddr] [Wr] A [DevAddr] A [DataLow] A [DataHigh] A [P] +This is implemented in the following way in the Linux kernel: +* I2C bus drivers which support SMBus Host Notify should call + i2c_setup_smbus_host_notify() to setup SMBus Host Notify support. +* I2C drivers for devices which can trigger SMBus Host Notify should implement + the optional alert() callback. + Packet Error Checking (PEC) =========================== -- cgit v1.1