Messages in this thread Patch in this message | | | From | Enric Balletbo i Serra <> | Subject | [PATCH v2 4/4] mfd: cros_ec: instantiate properly CrOS Touchpad MCU device | Date | Fri, 5 Apr 2019 19:33:24 +0200 |
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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> ---
Changes in v2: None
drivers/mfd/cros_ec_dev.c | 10 ++++++++++ include/linux/mfd/cros_ec.h | 1 + 2 files changed, 11 insertions(+)
diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 79746e817cdb..be827910e9d0 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -659,6 +659,16 @@ 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 diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h index b393bd4e4b73..981381fbb3fd 100644 --- a/include/linux/mfd/cros_ec.h +++ b/include/linux/mfd/cros_ec.h @@ -26,6 +26,7 @@ #define CROS_EC_DEV_FP_NAME "cros_fp" #define CROS_EC_DEV_ISH_NAME "cros_ish" #define CROS_EC_DEV_PD_NAME "cros_pd" +#define CROS_EC_DEV_TP_NAME "cros_tp" /* * The EC is unresponsive for a time after a reboot command. Add a -- 2.20.1
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