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mfd: cros_ec: Instantiate properly CrOS FP MCU device 

Support Fingerprint MCU as a special of CrOS EC devices. The current FP
MCU uses the same EC SPI protocol v3 as other CrOS EC devices on a SPI
bus.

When a MCU has fingerprint support (aka EC_FEATURE_FINGERPRINT), it is
instantiated as a special CrOS EC device with device name 'cros_fp'. So
regardless of the probing order between the actual cros_ec and cros_fp,
the userspace and other kernel drivers should not confuse them.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
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 11:19:55 +02:00 committed by Lee Jones
parent 93abf68b6b
commit 90486af5e0
2 changed files with 11 additions and 0 deletions
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10
drivers/mfd/cros_ec_dev.c
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@ -419,6 +419,16 @@ static int ec_device_probe(struct platform_device *pdev)
device_initialize(&ec->class_dev); device_initialize(&ec->class_dev);
cdev_init(&ec->cdev, &fops); cdev_init(&ec->cdev, &fops);
/* Check whether this is actually a Fingerprint MCU rather than an EC */
if (cros_ec_check_features(ec, EC_FEATURE_FINGERPRINT)) {
dev_info(dev, "CrOS Fingerprint MCU detected.\n");
/*
* Help userspace differentiating ECs from FP MCU,
* regardless of the probing order.
*/
ec_platform->ec_name = CROS_EC_DEV_FP_NAME;
}
/* /*
* Check whether this is actually an Integrated Sensor Hub (ISH) * Check whether this is actually an Integrated Sensor Hub (ISH)
* rather than an EC. * rather than an EC.

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

@ -23,6 +23,7 @@
#include <linux/mutex.h> #include <linux/mutex.h>
#define CROS_EC_DEV_NAME "cros_ec" #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_PD_NAME "cros_pd"
#define CROS_EC_DEV_ISH_NAME "cros_ish" #define CROS_EC_DEV_ISH_NAME "cros_ish"