From ca66a6770bd9d6d99e469debd1c7363ac455daf9 Mon Sep 17 00:00:00 2001 From: Johnny Chuang Date: Tue, 13 Apr 2021 09:20:50 +0800 Subject: 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 Reviewed-by: Harry Cutts Reviewed-by: Douglas Anderson Tested-by: Douglas Anderson Signed-off-by: Benjamin Tissoires --- drivers/hid/i2c-hid/i2c-hid-core.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'drivers/hid/i2c-hid') 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); -- cgit v1.2.3