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6b8145b054
Add support for PECI device drivers, which unlike PECI controller drivers are actually able to provide functionalities to userspace. Also, extend peci_request API to allow querying more details about PECI device (e.g. model/family), that's going to be used to find a compatible peci_driver. Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Acked-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com> Link: https://lore.kernel.org/r/20220208153639.255278-9-iwona.winiarska@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
237 lines
5.4 KiB
C
237 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2018-2021 Intel Corporation
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#include <linux/bug.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/idr.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/peci.h>
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#include <linux/pm_runtime.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include "internal.h"
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static DEFINE_IDA(peci_controller_ida);
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static void peci_controller_dev_release(struct device *dev)
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{
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struct peci_controller *controller = to_peci_controller(dev);
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mutex_destroy(&controller->bus_lock);
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ida_free(&peci_controller_ida, controller->id);
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kfree(controller);
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}
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struct device_type peci_controller_type = {
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.release = peci_controller_dev_release,
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};
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int peci_controller_scan_devices(struct peci_controller *controller)
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{
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int ret;
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u8 addr;
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for (addr = PECI_BASE_ADDR; addr < PECI_BASE_ADDR + PECI_DEVICE_NUM_MAX; addr++) {
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ret = peci_device_create(controller, addr);
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if (ret)
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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 struct peci_controller *peci_controller_alloc(struct device *dev,
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struct peci_controller_ops *ops)
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{
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struct peci_controller *controller;
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int ret;
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if (!ops->xfer)
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return ERR_PTR(-EINVAL);
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controller = kzalloc(sizeof(*controller), GFP_KERNEL);
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if (!controller)
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return ERR_PTR(-ENOMEM);
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ret = ida_alloc_max(&peci_controller_ida, U8_MAX, GFP_KERNEL);
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if (ret < 0)
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goto err;
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controller->id = ret;
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controller->ops = ops;
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controller->dev.parent = dev;
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controller->dev.bus = &peci_bus_type;
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controller->dev.type = &peci_controller_type;
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device_initialize(&controller->dev);
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mutex_init(&controller->bus_lock);
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return controller;
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err:
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kfree(controller);
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return ERR_PTR(ret);
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}
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static int unregister_child(struct device *dev, void *dummy)
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{
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peci_device_destroy(to_peci_device(dev));
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return 0;
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}
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static void unregister_controller(void *_controller)
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{
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struct peci_controller *controller = _controller;
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/*
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* Detach any active PECI devices. This can't fail, thus we do not
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* check the returned value.
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*/
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device_for_each_child_reverse(&controller->dev, NULL, unregister_child);
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device_unregister(&controller->dev);
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fwnode_handle_put(controller->dev.fwnode);
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pm_runtime_disable(&controller->dev);
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}
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/**
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* devm_peci_controller_add() - add PECI controller
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* @dev: device for devm operations
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* @ops: pointer to controller specific methods
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*
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* In final stage of its probe(), peci_controller driver calls
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* devm_peci_controller_add() to register itself with the PECI bus.
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*
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* Return: Pointer to the newly allocated controller or ERR_PTR() in case of failure.
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*/
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struct peci_controller *devm_peci_controller_add(struct device *dev,
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struct peci_controller_ops *ops)
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{
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struct peci_controller *controller;
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int ret;
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controller = peci_controller_alloc(dev, ops);
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if (IS_ERR(controller))
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return controller;
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ret = dev_set_name(&controller->dev, "peci-%d", controller->id);
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if (ret)
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goto err_put;
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pm_runtime_no_callbacks(&controller->dev);
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pm_suspend_ignore_children(&controller->dev, true);
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pm_runtime_enable(&controller->dev);
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device_set_node(&controller->dev, fwnode_handle_get(dev_fwnode(dev)));
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ret = device_add(&controller->dev);
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if (ret)
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goto err_fwnode;
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ret = devm_add_action_or_reset(dev, unregister_controller, controller);
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if (ret)
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return ERR_PTR(ret);
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/*
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* Ignoring retval since failures during scan are non-critical for
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* controller itself.
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*/
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peci_controller_scan_devices(controller);
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return controller;
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err_fwnode:
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fwnode_handle_put(controller->dev.fwnode);
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pm_runtime_disable(&controller->dev);
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err_put:
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put_device(&controller->dev);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_NS_GPL(devm_peci_controller_add, PECI);
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static const struct peci_device_id *
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peci_bus_match_device_id(const struct peci_device_id *id, struct peci_device *device)
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{
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while (id->family != 0) {
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if (id->family == device->info.family &&
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id->model == device->info.model)
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return id;
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id++;
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}
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return NULL;
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}
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static int peci_bus_device_match(struct device *dev, struct device_driver *drv)
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{
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struct peci_device *device = to_peci_device(dev);
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struct peci_driver *peci_drv = to_peci_driver(drv);
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if (dev->type != &peci_device_type)
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return 0;
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return !!peci_bus_match_device_id(peci_drv->id_table, device);
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}
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static int peci_bus_device_probe(struct device *dev)
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{
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struct peci_device *device = to_peci_device(dev);
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struct peci_driver *driver = to_peci_driver(dev->driver);
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return driver->probe(device, peci_bus_match_device_id(driver->id_table, device));
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}
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static void peci_bus_device_remove(struct device *dev)
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{
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struct peci_device *device = to_peci_device(dev);
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struct peci_driver *driver = to_peci_driver(dev->driver);
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if (driver->remove)
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driver->remove(device);
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}
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struct bus_type peci_bus_type = {
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.name = "peci",
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.match = peci_bus_device_match,
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.probe = peci_bus_device_probe,
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.remove = peci_bus_device_remove,
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.bus_groups = peci_bus_groups,
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};
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static int __init peci_init(void)
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{
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int ret;
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ret = bus_register(&peci_bus_type);
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if (ret < 0) {
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pr_err("peci: failed to register PECI bus type!\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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module_init(peci_init);
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static void __exit peci_exit(void)
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{
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bus_unregister(&peci_bus_type);
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}
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module_exit(peci_exit);
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MODULE_AUTHOR("Jason M Bills <jason.m.bills@linux.intel.com>");
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MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>");
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MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>");
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MODULE_DESCRIPTION("PECI bus core module");
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MODULE_LICENSE("GPL");
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