diff options
| author |   Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2019-05-08 11:19:55 +0200 |
|---|---|---|
| committer |   Lee Jones <lee.jones@linaro.org> | 2019-05-14 08:13:28 +0100 |
| commit | 90486af5e0f7334091b94264a84713611933e97e (patch) | |
| tree | 922bc0011aeb7055040e093d8c9fb2649bcfe672 /drivers/mfd | |
| parent | mfd: cros_ec: Update the EC feature codes (diff) | |
| download | linux-dev-90486af5e0f7334091b94264a84713611933e97e.tar.xz linux-dev-90486af5e0f7334091b94264a84713611933e97e.zip | |
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.c | 10 |
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. |