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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>
This commit is contained in:
Enric Balletbo i Serra 2019-05-08 11:19:56 +02:00 committed by Lee Jones
parent 90486af5e0
commit 4f8f2bb7ab
2 changed files with 11 additions and 0 deletions
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10
drivers/mfd/cros_ec_dev.c
View File

@ -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

1
include/linux/mfd/cros_ec.h
View File

@ -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"
/*