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 <[email protected]> Signed-off-by: Enric Balletbo i Serra <[email protected]> --- Changes in v4: None Changes in v3: None Changes in v2: None drivers/mfd/cros_ec_dev.c | 10 ++++++++++ include/linux/mfd/cros_ec.h | 1 + 2 files changed, 11 insertions(+) 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 diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h index 20fb5f298f73..2acbbec75eeb 100644 --- a/include/linux/mfd/cros_ec.h +++ b/include/linux/mfd/cros_ec.h @@ -25,6 +25,7 @@ #define CROS_EC_DEV_NAME "cros_ec" #define CROS_EC_DEV_FP_NAME "cros_fp" #define CROS_EC_DEV_PD_NAME "cros_pd" +#define CROS_EC_DEV_TP_NAME "cros_tp" #define CROS_EC_DEV_ISH_NAME "cros_ish" /* -- 2.20.1
