From: Mika Westerberg Date: Mon, 26 Jan 2015 14:29:32 +0000 (+0200) Subject: HID: i2c-hid: The interrupt should be level sensitive X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f2de746c3f03de4d33a9e69a91e821bd4c2c1030;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git HID: i2c-hid: The interrupt should be level sensitive The Microsoft HID over I2C specification says two things regarding the interrupt: 1) The interrupt should be level sensitive 2) The device keeps the interrupt asserted as long as it has more reports available. We've seen that at least some Atmel and N-Trig panels keep the line low as long as they have something to send. The current version of the driver only detects the first edge but then fails to read rest of the reports (as the line is still asserted). Make the driver follow the specification and configure the HID interrupt to be level sensitive. The Windows HID over I2C driver also seems to do the same. Signed-off-by: Mika Westerberg Acked-by: Benjamin Tissoires Signed-off-by: Jiri Kosina --- diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index d43e967e7533..8f1dfc5c5d9c 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -785,7 +785,7 @@ static int i2c_hid_init_irq(struct i2c_client *client) dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq); ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, client->name, ihid); if (ret < 0) { dev_warn(&client->dev,