HID: i2c-hid: Ignore input report if there's no data present on Elan touchpanels

While using Elan touchpads, the message floods:
[  136.138487] i2c_hid i2c-DELL08D6:00: i2c_hid_get_input: incomplete report (14/65535)

Though the message flood is annoying, the device it self works without
any issue. I suspect that the device in question takes too much time to
pull the IRQ back to high after I2C host has done reading its data.

Since the host receives all useful data, let's ignore the input report
when there's no data.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index 8555ce7e737b..2f940c1de616 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -50,6 +50,7 @@
 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET        BIT(1)
 #define I2C_HID_QUIRK_NO_RUNTIME_PM             BIT(2)
 #define I2C_HID_QUIRK_DELAY_AFTER_SLEEP         BIT(3)
+#define I2C_HID_QUIRK_BOGUS_IRQ                 BIT(4)
 
 /* flags */
 #define I2C_HID_STARTED         0
@@ -179,6 +180,8 @@ static const struct i2c_hid_quirks {
                 I2C_HID_QUIRK_DELAY_AFTER_SLEEP },
         { USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001,
                 I2C_HID_QUIRK_NO_RUNTIME_PM },
+        { USB_VENDOR_ID_ELAN, HID_ANY_ID,
+                 I2C_HID_QUIRK_BOGUS_IRQ },
         { 0, 0 }
 };
 
@@ -503,6 +506,12 @@ static void i2c_hid_get_input(struct i2c_hid *ihid)
                 return;
         }
 
+        if (ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ && ret_size == 0xffff) {
+                dev_warn_once(&ihid->client->dev, "%s: IRQ triggered but "
+                              "there's no data\n", __func__);
+                return;
+        }
+
         if ((ret_size > size) || (ret_size < 2)) {
                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
                         __func__, size, ret_size);