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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2020 Google LLC
*
* This driver serves as the receiver of cros_ec PD host events.
*/
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_data/cros_usbpd_notify.h>
#include <linux/platform_device.h>
#define DRV_NAME "cros-usbpd-notify"
#define ACPI_DRV_NAME "GOOG0003"
static BLOCKING_NOTIFIER_HEAD(cros_usbpd_notifier_list);
/**
* cros_usbpd_register_notify - Register a notifier callback for PD events.
* @nb: Notifier block pointer to register
*
* On ACPI platforms this corresponds to host events on the ECPD
* "GOOG0003" ACPI device. On non-ACPI platforms this will filter mkbp events
* for USB PD events.
*
* Return: 0 on success or negative error code.
*/
int cros_usbpd_register_notify(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&cros_usbpd_notifier_list,
nb);
}
EXPORT_SYMBOL_GPL(cros_usbpd_register_notify);
/**
* cros_usbpd_unregister_notify - Unregister notifier callback for PD events.
* @nb: Notifier block pointer to unregister
*
* Unregister a notifier callback that was previously registered with
* cros_usbpd_register_notify().
*/
void cros_usbpd_unregister_notify(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&cros_usbpd_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(cros_usbpd_unregister_notify);
#ifdef CONFIG_ACPI
static int cros_usbpd_notify_add_acpi(struct acpi_device *adev)
{
return 0;
}
static void cros_usbpd_notify_acpi(struct acpi_device *adev, u32 event)
{
blocking_notifier_call_chain(&cros_usbpd_notifier_list, event, NULL);
}
static const struct acpi_device_id cros_usbpd_notify_acpi_device_ids[] = {
{ ACPI_DRV_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, cros_usbpd_notify_acpi_device_ids);
static struct acpi_driver cros_usbpd_notify_acpi_driver = {
.name = DRV_NAME,
.class = DRV_NAME,
.ids = cros_usbpd_notify_acpi_device_ids,
.ops = {
.add = cros_usbpd_notify_add_acpi,
.notify = cros_usbpd_notify_acpi,
},
};
#endif /* CONFIG_ACPI */
static int cros_usbpd_notify_plat(struct notifier_block *nb,
unsigned long queued_during_suspend,
void *data)
{
struct cros_ec_device *ec_dev = (struct cros_ec_device *)data;
u32 host_event = cros_ec_get_host_event(ec_dev);
if (!host_event)
return NOTIFY_BAD;
if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
blocking_notifier_call_chain(&cros_usbpd_notifier_list,
host_event, NULL);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
static int cros_usbpd_notify_probe_plat(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
struct notifier_block *nb;
int ret;
nb = devm_kzalloc(dev, sizeof(*nb), GFP_KERNEL);
if (!nb)
return -ENOMEM;
nb->notifier_call = cros_usbpd_notify_plat;
dev_set_drvdata(dev, nb);
ret = blocking_notifier_chain_register(&ecdev->ec_dev->event_notifier,
nb);
if (ret < 0) {
dev_err(dev, "Failed to register notifier\n");
return ret;
}
return 0;
}
static int cros_usbpd_notify_remove_plat(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
struct notifier_block *nb =
(struct notifier_block *)dev_get_drvdata(dev);
blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier, nb);
return 0;
}
static struct platform_driver cros_usbpd_notify_plat_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = cros_usbpd_notify_probe_plat,
.remove = cros_usbpd_notify_remove_plat,
};
static int __init cros_usbpd_notify_init(void)
{
int ret;
ret = platform_driver_register(&cros_usbpd_notify_plat_driver);
if (ret < 0)
return ret;
#ifdef CONFIG_ACPI
acpi_bus_register_driver(&cros_usbpd_notify_acpi_driver);
#endif
return 0;
}
static void __exit cros_usbpd_notify_exit(void)
{
#ifdef CONFIG_ACPI
acpi_bus_unregister_driver(&cros_usbpd_notify_acpi_driver);
#endif
platform_driver_unregister(&cros_usbpd_notify_plat_driver);
}
module_init(cros_usbpd_notify_init);
module_exit(cros_usbpd_notify_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ChromeOS power delivery notifier device");
MODULE_AUTHOR("Jon Flatley <jflat@chromium.org>");
MODULE_ALIAS("platform:" DRV_NAME);
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