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
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:%01x:%04x:%04x:%02x",  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:%01x:%04x:%04x:%02x:%01x",  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()
95 static bool find_slave(struct sdw_bus *bus,  in find_slave()  argument
99 	u64 addr;  in find_slave()  local
103 	status = acpi_evaluate_integer(adev->handle,  in find_slave()
104 				       METHOD_NAME__ADR, NULL, &addr);  in find_slave()
107 		dev_err(bus->dev, "_ADR resolution failed: %x\n",  in find_slave()
112 	if (bus->ops->override_adr)  in find_slave()
113 		addr = bus->ops->override_adr(bus, addr);  in find_slave()
115 	if (!addr)  in find_slave()
119 	link_id = SDW_DISCO_LINK_ID(addr);  in find_slave()
122 	if (link_id != bus->link_id)  in find_slave()
125 	sdw_extract_slave_id(bus, addr, id);  in find_slave()
131  * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
132  * @bus: SDW bus instance
136 int sdw_acpi_find_slaves(struct sdw_bus *bus)  in sdw_acpi_find_slaves()  argument
141 	parent = ACPI_COMPANION(bus->dev);  in sdw_acpi_find_slaves()
143 		dev_err(bus->dev, "Can't find parent for acpi bind\n");  in sdw_acpi_find_slaves()
144 		return -ENODEV;  in sdw_acpi_find_slaves()
147 	list_for_each_entry(adev, &parent->children, node) {  in sdw_acpi_find_slaves()
152 		if (!find_slave(bus, adev, &id))  in sdw_acpi_find_slaves()
155 		/* brute-force O(N^2) search for duplicates */  in sdw_acpi_find_slaves()
157 		list_for_each_entry(adev2, &parent2->children, node) {  in sdw_acpi_find_slaves()
162 			if (!find_slave(bus, adev2, &id2))  in sdw_acpi_find_slaves()
172 				dev_dbg(bus->dev,  in sdw_acpi_find_slaves()
177 				dev_err(bus->dev,  in sdw_acpi_find_slaves()
180 				return -ENODEV;  in sdw_acpi_find_slaves()
191 		sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));  in sdw_acpi_find_slaves()
200  * sdw_of_find_slaves() - Find Slave devices in master device tree node
201  * @bus: SDW bus instance
205 int sdw_of_find_slaves(struct sdw_bus *bus)  in sdw_of_find_slaves()  argument
207 	struct device *dev = bus->dev;  in sdw_of_find_slaves()
210 	for_each_child_of_node(bus->dev->of_node, node) {  in sdw_of_find_slaves()
215 		const __be32 *addr;  in sdw_of_find_slaves()  local
230 		addr = of_get_property(node, "reg", &len);  in sdw_of_find_slaves()
231 		if (!addr || (len < 2 * sizeof(u32))) {  in sdw_of_find_slaves()
236 		link_id = be32_to_cpup(addr++);  in sdw_of_find_slaves()
237 		id.unique_id = be32_to_cpup(addr);  in sdw_of_find_slaves()
241 		if (link_id != bus->link_id)  in sdw_of_find_slaves()
244 		sdw_slave_add(bus, &id, of_fwnode_handle(node));  in sdw_of_find_slaves()