diff options
Diffstat (limited to 'drivers/pci/pwrctl/core.c')
| -rw-r--r-- | drivers/pci/pwrctl/core.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/drivers/pci/pwrctl/core.c b/drivers/pci/pwrctl/core.c deleted file mode 100644 index 01d913b60316..000000000000 --- a/drivers/pci/pwrctl/core.c +++ /dev/null @@ -1,157 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2024 Linaro Ltd. - */ - -#include <linux/device.h> -#include <linux/export.h> -#include <linux/kernel.h> -#include <linux/pci.h> -#include <linux/pci-pwrctl.h> -#include <linux/property.h> -#include <linux/slab.h> - -static int pci_pwrctl_notify(struct notifier_block *nb, unsigned long action, - void *data) -{ - struct pci_pwrctl *pwrctl = container_of(nb, struct pci_pwrctl, nb); - struct device *dev = data; - - if (dev_fwnode(dev) != dev_fwnode(pwrctl->dev)) - return NOTIFY_DONE; - - switch (action) { - case BUS_NOTIFY_ADD_DEVICE: - /* - * We will have two struct device objects bound to two different - * drivers on different buses but consuming the same DT node. We - * must not bind the pins twice in this case but only once for - * the first device to be added. - * - * If we got here then the PCI device is the second after the - * power control platform device. Mark its OF node as reused. - */ - dev->of_node_reused = true; - break; - case BUS_NOTIFY_BOUND_DRIVER: - pwrctl->link = device_link_add(dev, pwrctl->dev, - DL_FLAG_AUTOREMOVE_CONSUMER); - if (!pwrctl->link) - dev_err(pwrctl->dev, "Failed to add device link\n"); - break; - case BUS_NOTIFY_UNBOUND_DRIVER: - if (pwrctl->link) - device_link_remove(dev, pwrctl->dev); - break; - } - - return NOTIFY_DONE; -} - -static void rescan_work_func(struct work_struct *work) -{ - struct pci_pwrctl *pwrctl = container_of(work, struct pci_pwrctl, work); - - pci_lock_rescan_remove(); - pci_rescan_bus(to_pci_dev(pwrctl->dev->parent)->bus); - pci_unlock_rescan_remove(); -} - -/** - * pci_pwrctl_init() - Initialize the PCI power control context struct - * - * @pwrctl: PCI power control data - * @dev: Parent device - */ -void pci_pwrctl_init(struct pci_pwrctl *pwrctl, struct device *dev) -{ - pwrctl->dev = dev; - INIT_WORK(&pwrctl->work, rescan_work_func); -} -EXPORT_SYMBOL_GPL(pci_pwrctl_init); - -/** - * pci_pwrctl_device_set_ready() - Notify the pwrctl subsystem that the PCI - * device is powered-up and ready to be detected. - * - * @pwrctl: PCI power control data. - * - * Returns: - * 0 on success, negative error number on error. - * - * Note: - * This function returning 0 doesn't mean the device was detected. It means, - * that the bus rescan was successfully started. The device will get bound to - * its PCI driver asynchronously. - */ -int pci_pwrctl_device_set_ready(struct pci_pwrctl *pwrctl) -{ - int ret; - - if (!pwrctl->dev) - return -ENODEV; - - pwrctl->nb.notifier_call = pci_pwrctl_notify; - ret = bus_register_notifier(&pci_bus_type, &pwrctl->nb); - if (ret) - return ret; - - schedule_work(&pwrctl->work); - - return 0; -} -EXPORT_SYMBOL_GPL(pci_pwrctl_device_set_ready); - -/** - * pci_pwrctl_device_unset_ready() - Notify the pwrctl subsystem that the PCI - * device is about to be powered-down. - * - * @pwrctl: PCI power control data. - */ -void pci_pwrctl_device_unset_ready(struct pci_pwrctl *pwrctl) -{ - /* - * We don't have to delete the link here. Typically, this function - * is only called when the power control device is being detached. If - * it is being detached then the child PCI device must have already - * been unbound too or the device core wouldn't let us unbind. - */ - bus_unregister_notifier(&pci_bus_type, &pwrctl->nb); -} -EXPORT_SYMBOL_GPL(pci_pwrctl_device_unset_ready); - -static void devm_pci_pwrctl_device_unset_ready(void *data) -{ - struct pci_pwrctl *pwrctl = data; - - pci_pwrctl_device_unset_ready(pwrctl); -} - -/** - * devm_pci_pwrctl_device_set_ready - Managed variant of - * pci_pwrctl_device_set_ready(). - * - * @dev: Device managing this pwrctl provider. - * @pwrctl: PCI power control data. - * - * Returns: - * 0 on success, negative error number on error. - */ -int devm_pci_pwrctl_device_set_ready(struct device *dev, - struct pci_pwrctl *pwrctl) -{ - int ret; - - ret = pci_pwrctl_device_set_ready(pwrctl); - if (ret) - return ret; - - return devm_add_action_or_reset(dev, - devm_pci_pwrctl_device_unset_ready, - pwrctl); -} -EXPORT_SYMBOL_GPL(devm_pci_pwrctl_device_set_ready); - -MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>"); -MODULE_DESCRIPTION("PCI Device Power Control core driver"); -MODULE_LICENSE("GPL"); |