1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright (c) 2018-2021 Intel Corporation
5 #include <linux/peci.h>
6 #include <linux/peci-cpu.h>
12  * PECI device can be removed using sysfs, but the removal can also happen as
13  * a result of controller being removed.
14  * Mutex is used to protect PECI device from being double-deleted.
29 	 * PECI device may be in a state where it is unable to return a proper  in peci_get_revision()
37 		return -EIO;  in peci_get_revision()
103 	device->info.family = peci_x86_cpu_family(cpu_id);  in peci_device_info_init()
104 	device->info.model = peci_x86_cpu_model(cpu_id);  in peci_device_info_init()
109 	device->info.peci_revision = revision;  in peci_device_info_init()
111 	device->info.socket_id = device->addr - PECI_BASE_ADDR;  in peci_device_info_init()
116 static int peci_detect(struct peci_controller *controller, u8 addr)  in peci_detect()  argument
119 	 * PECI Ping is a command encoded by tx_len = 0, rx_len = 0.  in peci_detect()
126 	mutex_lock(&controller->bus_lock);  in peci_detect()
127 	ret = controller->ops->xfer(controller, addr, &req);  in peci_detect()
128 	mutex_unlock(&controller->bus_lock);  in peci_detect()
143 	if (device->addr == *addr)  in peci_dev_exists()
144 		return -EBUSY;  in peci_dev_exists()
149 int peci_device_create(struct peci_controller *controller, u8 addr)  in peci_device_create()  argument
155 		return -EINVAL;  in peci_device_create()
158 	ret = device_for_each_child(&controller->dev, &addr, peci_dev_exists);  in peci_device_create()
162 	ret = peci_detect(controller, addr);  in peci_device_create()
168 		if (ret == -EIO || ret == -ETIMEDOUT)  in peci_device_create()
176 		return -ENOMEM;  in peci_device_create()
178 	device_initialize(&device->dev);  in peci_device_create()
180 	device->addr = addr;  in peci_device_create()
181 	device->dev.parent = &controller->dev;  in peci_device_create()
182 	device->dev.bus = &peci_bus_type;  in peci_device_create()
183 	device->dev.type = &peci_device_type;  in peci_device_create()
189 	ret = dev_set_name(&device->dev, "%d-%02x", controller->id, device->addr);  in peci_device_create()
193 	ret = device_add(&device->dev);  in peci_device_create()
200 	put_device(&device->dev);  in peci_device_create()
208 	if (!device->deleted) {  in peci_device_destroy()
209 		device_unregister(&device->dev);  in peci_device_destroy()
210 		device->deleted = true;  in peci_device_destroy()
218 	driver->driver.bus = &peci_bus_type;  in __peci_driver_register()
219 	driver->driver.owner = owner;  in __peci_driver_register()
220 	driver->driver.mod_name = mod_name;  in __peci_driver_register()
222 	if (!driver->probe) {  in __peci_driver_register()
223 		pr_err("peci: trying to register driver without probe callback\n");  in __peci_driver_register()
224 		return -EINVAL;  in __peci_driver_register()
227 	if (!driver->id_table) {  in __peci_driver_register()
228 		pr_err("peci: trying to register driver without device id table\n");  in __peci_driver_register()
229 		return -EINVAL;  in __peci_driver_register()
232 	return driver_register(&driver->driver);  in __peci_driver_register()
234 EXPORT_SYMBOL_NS_GPL(__peci_driver_register, PECI);
238 	driver_unregister(&driver->driver);  in peci_driver_unregister()
240 EXPORT_SYMBOL_NS_GPL(peci_driver_unregister, PECI);