From 4f8f2bb7ab032150ba94cf60ea5aaf3e3ac3d2ca Mon Sep 17 00:00:00 2001 From: Enric Balletbo i Serra Date: Wed, 8 May 2019 11:19:56 +0200 Subject: mfd: cros_ec: Instantiate properly CrOS Touchpad MCU device Support Touchpad MCU as a special of CrOS EC devices. The current Touchpad MCU is used on Eve Chromebook and used the same protocol as other CrOS EC devices. When a MCU has touchpad support (aka EC_FEATURE_TOUCHPAD), it is instantiated as a special CrOS EC device with device name 'cros_tp'. So regardless of the probing order between the actual cros_ec and cros_tp, the userspace and other kernel drivers should not confuse them. Signed-off-by: Wei-Ning Huang Signed-off-by: Enric Balletbo i Serra Signed-off-by: Lee Jones --- drivers/mfd/cros_ec_dev.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/mfd') diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 71a01a096595..54a58df571b6 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -442,6 +442,16 @@ static int ec_device_probe(struct platform_device *pdev) ec_platform->ec_name = CROS_EC_DEV_ISH_NAME; } + /* Check whether this is actually a Touchpad MCU rather than an EC */ + if (cros_ec_check_features(ec, EC_FEATURE_TOUCHPAD)) { + dev_info(dev, "CrOS Touchpad MCU detected.\n"); + /* + * Help userspace differentiating ECs from TP MCU, + * regardless of the probing order. + */ + ec_platform->ec_name = CROS_EC_DEV_TP_NAME; + } + /* * Add the class device * Link to the character device for creating the /dev entry -- cgit v1.2.3-59-g8ed1b