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authorEnric Balletbo i Serra <enric.balletbo@collabora.com>2019-05-08 12:19:56 +0300
committerLee Jones <lee.jones@linaro.org>2019-05-14 10:13:28 +0300
commit4f8f2bb7ab032150ba94cf60ea5aaf3e3ac3d2ca (patch)
treedc3d0c8feb4e6ec1ff482b00b97d7a31f949c312 /drivers/mfd
parent90486af5e0f7334091b94264a84713611933e97e (diff)
downloadlinux-4f8f2bb7ab032150ba94cf60ea5aaf3e3ac3d2ca.tar.xz
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 <wnhuang@google.com> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/cros_ec_dev.c10
1 files changed, 10 insertions, 0 deletions
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