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authorEnric Balletbo i Serra <enric.balletbo@collabora.com>2019-05-08 11:19:55 +0200
committerLee Jones <lee.jones@linaro.org>2019-05-14 08:13:28 +0100
commit90486af5e0f7334091b94264a84713611933e97e (patch)
tree922bc0011aeb7055040e093d8c9fb2649bcfe672 /drivers/mfd
parent93abf68b6bcb50481d84db41e4d7e7e143f24757 (diff)
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>
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 a3b319913097..71a01a096595 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -419,6 +419,16 @@ static int ec_device_probe(struct platform_device *pdev)
device_initialize(&ec->class_dev);
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)
* rather than an EC.