Commit a89af4ab authored by Brendan McGrath's avatar Brendan McGrath Committed by Jiri Kosina
Browse files

HID: i2c-hid: Add sleep between POWER ON and RESET

Support for the Asus Touchpad was recently added. It turns out this
device can fail initialisation (and become unusable) when the RESET
command is sent too soon after the POWER ON command.

Unfortunately the i2c-hid specification does not specify the need for
a delay between these two commands. But it was discovered the Windows
driver has a 1ms delay.

As a result, this patch modifies the i2c-hid module to add a sleep
inbetween the POWER ON and RESET commands which lasts between 1ms and 5ms.


 for further
Signed-off-by: default avatarBrendan McGrath <>
Reviewed-by: default avatarBenjamin Tissoires <>
Signed-off-by: default avatarJiri Kosina <>
parent 1ebb7114
......@@ -426,6 +426,15 @@ static int i2c_hid_hwreset(struct i2c_client *client)
if (ret)
goto out_unlock;
* The HID over I2C specification states that if a DEVICE needs time
* after the PWR_ON request, it should utilise CLOCK stretching.
* However, it has been observered that the Windows driver provides a
* 1ms sleep between the PWR_ON and RESET requests and that some devices
* rely on this.
usleep_range(1000, 5000);
i2c_hid_dbg(ihid, "resetting...\n");
ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
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