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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2016-06-09 16:53:48 +0200
committerWolfram Sang <wsa@the-dreams.de>2016-06-17 13:24:05 +0200
commite456cd37bc28abe47dc65189df916ac0510ac1d4 (patch)
tree28f3dc9cdf024c2ee088002cb00ec526b87a4e34 /Documentation/i2c
parentb4f210541fc319bd643ad9a4fdbfe2ce31be6cfc (diff)
downloadblackbird-op-linux-e456cd37bc28abe47dc65189df916ac0510ac1d4.tar.gz
blackbird-op-linux-e456cd37bc28abe47dc65189df916ac0510ac1d4.zip
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 <aduggan@synaptics.com> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/smbus-protocol6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/i2c/smbus-protocol b/Documentation/i2c/smbus-protocol
index 6012b12b3510..14d4ec1be245 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)
===========================
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