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mfd: cros_ec: Add cros-usbpd-notify subdevice

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Add the cros-usbpd-notify driver as a subdevice on platforms that
support the EC_FEATURE_USB_PD EC feature flag and don't have the
ACPI PD notification device defined.

This driver allows other cros-ec devices to receive PD event
notifications from the Chrome OS Embedded Controller (EC) via a
notification chain.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Prashant Malani 2020-01-14 15:22:20 -08:00 committed by Lee Jones
parent 1112ba02ff
commit 4602dce036
1 changed files with 22 additions and 0 deletions
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22
drivers/mfd/cros_ec_dev.c
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@ -5,6 +5,7 @@
* Copyright (C) 2014 Google, Inc.
*/
#include <linux/kconfig.h>
#include <linux/mfd/core.h>
#include <linux/mfd/cros_ec.h>
#include <linux/module.h>
@ -87,6 +88,10 @@ static const struct mfd_cell cros_usbpd_charger_cells[] = {
{ .name = "cros-usbpd-logger", },
};
static const struct mfd_cell cros_usbpd_notify_cells[] = {
{ .name = "cros-usbpd-notify", },
};
static const struct cros_feature_to_cells cros_subdevices[] = {
{
.id = EC_FEATURE_CEC,
@ -202,6 +207,23 @@ static int ec_device_probe(struct platform_device *pdev)
}
}
/*
* The PD notifier driver cell is separate since it only needs to be
* explicitly added on platforms that don't have the PD notifier ACPI
* device entry defined.
*/
if (IS_ENABLED(CONFIG_OF)) {
if (cros_ec_check_features(ec, EC_FEATURE_USB_PD)) {
retval = mfd_add_hotplug_devices(ec->dev,
cros_usbpd_notify_cells,
ARRAY_SIZE(cros_usbpd_notify_cells));
if (retval)
dev_err(ec->dev,
"failed to add PD notify devices: %d\n",
retval);
}
}
/*
* The following subdevices cannot be detected by sending the
* EC_FEATURE_GET_CMD to the Embedded Controller device.