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authorJohnny Chuang <johnny.chuang.emc@gmail.com>2021-04-13 09:20:50 +0800
committerBenjamin Tissoires <benjamin.tissoires@redhat.com>2021-05-07 14:32:28 +0200
commitca66a6770bd9d6d99e469debd1c7363ac455daf9 (patch)
tree9cc1b47abf27ab4f3ca54ed03ce09f40571f8ad0 /drivers/hid
parent6be388f4a35d2ce5ef7dbf635a8964a5da7f799f (diff)
downloadlinux-ca66a6770bd9d6d99e469debd1c7363ac455daf9.tar.bz2
HID: i2c-hid: Skip ELAN power-on command after reset
For ELAN touchscreen, we found our boot code of IC was not flexible enough to receive and handle this command. Once the FW main code of our controller is crashed for some reason, the controller could not be enumerated successfully to be recognized by the system host. therefore, it lost touch functionality. Add quirk for skip send power-on command after reset. It will impact to ELAN touchscreen and touchpad on HID over I2C projects. Fixes: 43b7029f475e ("HID: i2c-hid: Send power-on command after reset"). Cc: stable@vger.kernel.org Signed-off-by: Johnny Chuang <johnny.chuang.emc@gmail.com> Reviewed-by: Harry Cutts <hcutts@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/i2c-hid/i2c-hid-core.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index 9993133989a5..ce91b1e57876 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -45,6 +45,7 @@
#define I2C_HID_QUIRK_BOGUS_IRQ BIT(4)
#define I2C_HID_QUIRK_RESET_ON_RESUME BIT(5)
#define I2C_HID_QUIRK_BAD_INPUT_SIZE BIT(6)
+#define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET BIT(7)
/* flags */
@@ -178,6 +179,11 @@ static const struct i2c_hid_quirks {
I2C_HID_QUIRK_RESET_ON_RESUME },
{ USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
I2C_HID_QUIRK_BAD_INPUT_SIZE },
+ /*
+ * Sending the wakeup after reset actually break ELAN touchscreen controller
+ */
+ { USB_VENDOR_ID_ELAN, HID_ANY_ID,
+ I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET },
{ 0, 0 }
};
@@ -461,7 +467,8 @@ static int i2c_hid_hwreset(struct i2c_client *client)
}
/* At least some SIS devices need this after reset */
- ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
+ if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
+ ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
out_unlock:
mutex_unlock(&ihid->reset_lock);