1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
8 #include "bus.h"
24 int sdw_slave_add(struct sdw_bus *bus,  in sdw_slave_add()  argument
25 		  struct sdw_slave_id *id, struct fwnode_handle *fwnode)  in sdw_slave_add()  argument
33 		return -ENOMEM;  in sdw_slave_add()
36 	memcpy(&slave->id, id, sizeof(*id));  in sdw_slave_add()
37 	slave->dev.parent = bus->dev;  in sdw_slave_add()
38 	slave->dev.fwnode = fwnode;  in sdw_slave_add()
40 	if (id->unique_id == SDW_IGNORED_UNIQUE_ID) {  in sdw_slave_add()
42 		dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x",  in sdw_slave_add()
43 			     bus->link_id, id->mfg_id, id->part_id,  in sdw_slave_add()
44 			     id->class_id);  in sdw_slave_add()
47 		dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x",  in sdw_slave_add()
48 			     bus->link_id, id->mfg_id, id->part_id,  in sdw_slave_add()
49 			     id->class_id, id->unique_id);  in sdw_slave_add()
52 	slave->dev.bus = &sdw_bus_type;  in sdw_slave_add()
53 	slave->dev.of_node = of_node_get(to_of_node(fwnode));  in sdw_slave_add()
54 	slave->dev.type = &sdw_slave_type;  in sdw_slave_add()
55 	slave->dev.groups = sdw_slave_status_attr_groups;  in sdw_slave_add()
56 	slave->bus = bus;  in sdw_slave_add()
57 	slave->status = SDW_SLAVE_UNATTACHED;  in sdw_slave_add()
58 	init_completion(&slave->enumeration_complete);  in sdw_slave_add()
59 	init_completion(&slave->initialization_complete);  in sdw_slave_add()
60 	slave->dev_num = 0;  in sdw_slave_add()
61 	init_completion(&slave->probe_complete);  in sdw_slave_add()
62 	slave->probed = false;  in sdw_slave_add()
63 	slave->first_interrupt_done = false;  in sdw_slave_add()
66 		init_completion(&slave->port_ready[i]);  in sdw_slave_add()
68 	mutex_lock(&bus->bus_lock);  in sdw_slave_add()
69 	list_add_tail(&slave->node, &bus->slaves);  in sdw_slave_add()
70 	mutex_unlock(&bus->bus_lock);  in sdw_slave_add()
72 	ret = device_register(&slave->dev);  in sdw_slave_add()
74 		dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);  in sdw_slave_add()
80 		mutex_lock(&bus->bus_lock);  in sdw_slave_add()
81 		list_del(&slave->node);  in sdw_slave_add()
82 		mutex_unlock(&bus->bus_lock);  in sdw_slave_add()
83 		put_device(&slave->dev);  in sdw_slave_add()
94 static bool find_slave(struct sdw_bus *bus,  in find_slave()  argument
96 		       struct sdw_slave_id *id)  in find_slave()  argument
102 	status = acpi_evaluate_integer(adev->handle,  in find_slave()
106 		dev_err(bus->dev, "_ADR resolution failed: %x\n",  in find_slave()
111 	/* Extract link id from ADR, Bit 51 to 48 (included) */  in find_slave()
115 	if (link_id != bus->link_id)  in find_slave()
118 	sdw_extract_slave_id(bus, addr, id);  in find_slave()
124  * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
125  * @bus: SDW bus instance
129 int sdw_acpi_find_slaves(struct sdw_bus *bus)  in sdw_acpi_find_slaves()  argument
134 	parent = ACPI_COMPANION(bus->dev);  in sdw_acpi_find_slaves()
136 		dev_err(bus->dev, "Can't find parent for acpi bind\n");  in sdw_acpi_find_slaves()
137 		return -ENODEV;  in sdw_acpi_find_slaves()
140 	list_for_each_entry(adev, &parent->children, node) {  in sdw_acpi_find_slaves()
141 		struct sdw_slave_id id;  in sdw_acpi_find_slaves()  local
145 		if (!find_slave(bus, adev, &id))  in sdw_acpi_find_slaves()
148 		/* brute-force O(N^2) search for duplicates */  in sdw_acpi_find_slaves()
150 		list_for_each_entry(adev2, &parent2->children, node) {  in sdw_acpi_find_slaves()
155 			if (!find_slave(bus, adev2, &id2))  in sdw_acpi_find_slaves()
158 			if (id.sdw_version != id2.sdw_version ||  in sdw_acpi_find_slaves()
159 			    id.mfg_id != id2.mfg_id ||  in sdw_acpi_find_slaves()
160 			    id.part_id != id2.part_id ||  in sdw_acpi_find_slaves()
161 			    id.class_id != id2.class_id)  in sdw_acpi_find_slaves()
164 			if (id.unique_id != id2.unique_id) {  in sdw_acpi_find_slaves()
165 				dev_dbg(bus->dev,  in sdw_acpi_find_slaves()
167 					id.unique_id, id2.unique_id,  in sdw_acpi_find_slaves()
168 					id.mfg_id, id.part_id);  in sdw_acpi_find_slaves()
171 				dev_err(bus->dev,  in sdw_acpi_find_slaves()
173 					id.unique_id, id2.unique_id,  in sdw_acpi_find_slaves()
174 					id.mfg_id, id.part_id);  in sdw_acpi_find_slaves()
175 				return -ENODEV;  in sdw_acpi_find_slaves()
180 			id.unique_id = SDW_IGNORED_UNIQUE_ID;  in sdw_acpi_find_slaves()
186 		sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));  in sdw_acpi_find_slaves()
195  * sdw_of_find_slaves() - Find Slave devices in master device tree node
196  * @bus: SDW bus instance
200 int sdw_of_find_slaves(struct sdw_bus *bus)  in sdw_of_find_slaves()  argument
202 	struct device *dev = bus->dev;  in sdw_of_find_slaves()
205 	for_each_child_of_node(bus->dev->of_node, node) {  in sdw_of_find_slaves()
209 		struct sdw_slave_id id;  in sdw_of_find_slaves()  local
217 			     &id.mfg_id, &id.part_id, &id.class_id);  in sdw_of_find_slaves()
227 			dev_err(dev, "Invalid Link and Instance ID\n");  in sdw_of_find_slaves()
232 		id.unique_id = be32_to_cpup(addr);  in sdw_of_find_slaves()
233 		id.sdw_version = sdw_version;  in sdw_of_find_slaves()
236 		if (link_id != bus->link_id)  in sdw_of_find_slaves()
239 		sdw_slave_add(bus, &id, of_fwnode_handle(node));  in sdw_of_find_slaves()