262 lines
6.7 KiB
C
262 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2020 Google LLC
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*
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* This driver serves as the receiver of cros_ec PD host events.
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*/
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/platform_data/cros_ec_proto.h>
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#include <linux/platform_data/cros_usbpd_notify.h>
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#include <linux/platform_device.h>
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#define DRV_NAME "cros-usbpd-notify"
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#define DRV_NAME_PLAT_ACPI "cros-usbpd-notify-acpi"
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#define ACPI_DRV_NAME "GOOG0003"
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static BLOCKING_NOTIFIER_HEAD(cros_usbpd_notifier_list);
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struct cros_usbpd_notify_data {
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struct device *dev;
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struct cros_ec_device *ec;
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struct notifier_block nb;
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};
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/**
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* cros_usbpd_register_notify - Register a notifier callback for PD events.
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* @nb: Notifier block pointer to register
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*
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* On ACPI platforms this corresponds to host events on the ECPD
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* "GOOG0003" ACPI device. On non-ACPI platforms this will filter mkbp events
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* for USB PD events.
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*
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* Return: 0 on success or negative error code.
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*/
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int cros_usbpd_register_notify(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&cros_usbpd_notifier_list,
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nb);
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}
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EXPORT_SYMBOL_GPL(cros_usbpd_register_notify);
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/**
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* cros_usbpd_unregister_notify - Unregister notifier callback for PD events.
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* @nb: Notifier block pointer to unregister
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*
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* Unregister a notifier callback that was previously registered with
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* cros_usbpd_register_notify().
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*/
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void cros_usbpd_unregister_notify(struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&cros_usbpd_notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(cros_usbpd_unregister_notify);
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static void cros_usbpd_get_event_and_notify(struct device *dev,
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struct cros_ec_device *ec_dev)
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{
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struct ec_response_host_event_status host_event_status;
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u32 event = 0;
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int ret;
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/*
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* We still send a 0 event out to older devices which don't
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* have the updated device heirarchy.
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*/
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if (!ec_dev) {
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dev_dbg(dev,
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"EC device inaccessible; sending 0 event status.\n");
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goto send_notify;
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}
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/* Check for PD host events on EC. */
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ret = cros_ec_command(ec_dev, 0, EC_CMD_PD_HOST_EVENT_STATUS,
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NULL, 0, &host_event_status, sizeof(host_event_status));
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if (ret < 0) {
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dev_warn(dev, "Can't get host event status (err: %d)\n", ret);
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goto send_notify;
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}
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event = host_event_status.status;
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send_notify:
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blocking_notifier_call_chain(&cros_usbpd_notifier_list, event, NULL);
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}
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#ifdef CONFIG_ACPI
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static void cros_usbpd_notify_acpi(acpi_handle device, u32 event, void *data)
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{
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struct cros_usbpd_notify_data *pdnotify = data;
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cros_usbpd_get_event_and_notify(pdnotify->dev, pdnotify->ec);
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}
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static int cros_usbpd_notify_probe_acpi(struct platform_device *pdev)
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{
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struct cros_usbpd_notify_data *pdnotify;
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struct device *dev = &pdev->dev;
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struct acpi_device *adev;
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struct cros_ec_device *ec_dev;
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acpi_status status;
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adev = ACPI_COMPANION(dev);
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pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
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if (!pdnotify)
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return -ENOMEM;
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/* Get the EC device pointer needed to talk to the EC. */
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ec_dev = dev_get_drvdata(dev->parent);
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if (!ec_dev) {
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/*
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* We continue even for older devices which don't have the
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* correct device heirarchy, namely, GOOG0003 is a child
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* of GOOG0004.
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*/
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dev_warn(dev, "Couldn't get Chrome EC device pointer.\n");
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}
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pdnotify->dev = dev;
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pdnotify->ec = ec_dev;
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status = acpi_install_notify_handler(adev->handle,
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ACPI_ALL_NOTIFY,
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cros_usbpd_notify_acpi,
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pdnotify);
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if (ACPI_FAILURE(status)) {
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dev_warn(dev, "Failed to register notify handler %08x\n",
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status);
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return -EINVAL;
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}
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return 0;
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}
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static int cros_usbpd_notify_remove_acpi(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct acpi_device *adev = ACPI_COMPANION(dev);
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acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
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cros_usbpd_notify_acpi);
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return 0;
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}
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static const struct acpi_device_id cros_usbpd_notify_acpi_device_ids[] = {
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{ ACPI_DRV_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, cros_usbpd_notify_acpi_device_ids);
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static struct platform_driver cros_usbpd_notify_acpi_driver = {
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.driver = {
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.name = DRV_NAME_PLAT_ACPI,
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.acpi_match_table = cros_usbpd_notify_acpi_device_ids,
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},
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.probe = cros_usbpd_notify_probe_acpi,
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.remove = cros_usbpd_notify_remove_acpi,
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};
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#endif /* CONFIG_ACPI */
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static int cros_usbpd_notify_plat(struct notifier_block *nb,
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unsigned long queued_during_suspend,
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void *data)
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{
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struct cros_usbpd_notify_data *pdnotify = container_of(nb,
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struct cros_usbpd_notify_data, nb);
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struct cros_ec_device *ec_dev = (struct cros_ec_device *)data;
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u32 host_event = cros_ec_get_host_event(ec_dev);
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if (!host_event)
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return NOTIFY_DONE;
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if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) |
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EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
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cros_usbpd_get_event_and_notify(pdnotify->dev, ec_dev);
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return NOTIFY_OK;
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}
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return NOTIFY_DONE;
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}
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static int cros_usbpd_notify_probe_plat(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
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struct cros_usbpd_notify_data *pdnotify;
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int ret;
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pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
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if (!pdnotify)
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return -ENOMEM;
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pdnotify->dev = dev;
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pdnotify->ec = ecdev->ec_dev;
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pdnotify->nb.notifier_call = cros_usbpd_notify_plat;
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dev_set_drvdata(dev, pdnotify);
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ret = blocking_notifier_chain_register(&ecdev->ec_dev->event_notifier,
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&pdnotify->nb);
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if (ret < 0) {
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dev_err(dev, "Failed to register notifier\n");
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return ret;
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}
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return 0;
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}
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static int cros_usbpd_notify_remove_plat(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
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struct cros_usbpd_notify_data *pdnotify =
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(struct cros_usbpd_notify_data *)dev_get_drvdata(dev);
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blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier,
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&pdnotify->nb);
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return 0;
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}
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static struct platform_driver cros_usbpd_notify_plat_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.probe = cros_usbpd_notify_probe_plat,
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.remove = cros_usbpd_notify_remove_plat,
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};
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static int __init cros_usbpd_notify_init(void)
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{
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int ret;
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ret = platform_driver_register(&cros_usbpd_notify_plat_driver);
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if (ret < 0)
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return ret;
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#ifdef CONFIG_ACPI
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platform_driver_register(&cros_usbpd_notify_acpi_driver);
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#endif
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return 0;
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}
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static void __exit cros_usbpd_notify_exit(void)
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{
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#ifdef CONFIG_ACPI
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platform_driver_unregister(&cros_usbpd_notify_acpi_driver);
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#endif
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platform_driver_unregister(&cros_usbpd_notify_plat_driver);
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}
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module_init(cros_usbpd_notify_init);
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module_exit(cros_usbpd_notify_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ChromeOS power delivery notifier device");
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MODULE_AUTHOR("Jon Flatley <jflat@chromium.org>");
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MODULE_ALIAS("platform:" DRV_NAME);
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