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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 /include/linux/i2c.h
parentb4f210541fc319bd643ad9a4fdbfe2ce31be6cfc (diff)
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 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 37a45dcd6592..fffdc270ca18 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -128,6 +128,7 @@ i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
enum i2c_alert_protocol {
I2C_PROTOCOL_SMBUS_ALERT,
+ I2C_PROTOCOL_SMBUS_HOST_NOTIFY,
};
/**
@@ -184,6 +185,8 @@ struct i2c_driver {
* The format and meaning of the data value depends on the protocol.
* For the SMBus alert protocol, there is a single bit of data passed
* as the alert response's low bit ("event flag").
+ * For the SMBus Host Notify protocol, the data corresponds to the
+ * 16-bit payload data reported by the slave device acting as master.
*/
void (*alert)(struct i2c_client *, enum i2c_alert_protocol protocol,
unsigned int data);