1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-17 Intel Corporation. 3 4 #include <linux/acpi.h> 5 #include <linux/of.h> 6 #include <linux/soundwire/sdw.h> 7 #include <linux/soundwire/sdw_type.h> 8 #include "bus.h" 9 #include "sysfs_local.h" 10 11 static void sdw_slave_release(struct device *dev) 12 { 13 struct sdw_slave *slave = dev_to_sdw_dev(dev); 14 15 kfree(slave); 16 } 17 18 struct device_type sdw_slave_type = { 19 .name = "sdw_slave", 20 .release = sdw_slave_release, 21 .uevent = sdw_slave_uevent, 22 }; 23 24 int sdw_slave_add(struct sdw_bus *bus, 25 struct sdw_slave_id *id, struct fwnode_handle *fwnode) 26 { 27 struct sdw_slave *slave; 28 int ret; 29 int i; 30 31 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 32 if (!slave) 33 return -ENOMEM; 34 35 /* Initialize data structure */ 36 memcpy(&slave->id, id, sizeof(*id)); 37 slave->dev.parent = bus->dev; 38 slave->dev.fwnode = fwnode; 39 40 if (id->unique_id == SDW_IGNORED_UNIQUE_ID) { 41 /* name shall be sdw:link:mfg:part:class */ 42 dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x", 43 bus->link_id, id->mfg_id, id->part_id, 44 id->class_id); 45 } else { 46 /* name shall be sdw:link:mfg:part:class:unique */ 47 dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x", 48 bus->link_id, id->mfg_id, id->part_id, 49 id->class_id, id->unique_id); 50 } 51 52 slave->dev.bus = &sdw_bus_type; 53 slave->dev.of_node = of_node_get(to_of_node(fwnode)); 54 slave->dev.type = &sdw_slave_type; 55 slave->dev.groups = sdw_slave_status_attr_groups; 56 slave->bus = bus; 57 slave->status = SDW_SLAVE_UNATTACHED; 58 init_completion(&slave->enumeration_complete); 59 init_completion(&slave->initialization_complete); 60 slave->dev_num = 0; 61 init_completion(&slave->probe_complete); 62 slave->probed = false; 63 slave->first_interrupt_done = false; 64 65 for (i = 0; i < SDW_MAX_PORTS; i++) 66 init_completion(&slave->port_ready[i]); 67 68 mutex_lock(&bus->bus_lock); 69 list_add_tail(&slave->node, &bus->slaves); 70 mutex_unlock(&bus->bus_lock); 71 72 ret = device_register(&slave->dev); 73 if (ret) { 74 dev_err(bus->dev, "Failed to add slave: ret %d\n", ret); 75 76 /* 77 * On err, don't free but drop ref as this will be freed 78 * when release method is invoked. 79 */ 80 mutex_lock(&bus->bus_lock); 81 list_del(&slave->node); 82 mutex_unlock(&bus->bus_lock); 83 put_device(&slave->dev); 84 85 return ret; 86 } 87 sdw_slave_debugfs_init(slave); 88 89 return ret; 90 } 91 EXPORT_SYMBOL(sdw_slave_add); 92 93 #if IS_ENABLED(CONFIG_ACPI) 94 95 static bool find_slave(struct sdw_bus *bus, 96 struct acpi_device *adev, 97 struct sdw_slave_id *id) 98 { 99 u64 addr; 100 unsigned int link_id; 101 acpi_status status; 102 103 status = acpi_evaluate_integer(adev->handle, 104 METHOD_NAME__ADR, NULL, &addr); 105 106 if (ACPI_FAILURE(status)) { 107 dev_err(bus->dev, "_ADR resolution failed: %x\n", 108 status); 109 return false; 110 } 111 112 if (bus->ops->override_adr) 113 addr = bus->ops->override_adr(bus, addr); 114 115 if (!addr) 116 return false; 117 118 /* Extract link id from ADR, Bit 51 to 48 (included) */ 119 link_id = SDW_DISCO_LINK_ID(addr); 120 121 /* Check for link_id match */ 122 if (link_id != bus->link_id) 123 return false; 124 125 sdw_extract_slave_id(bus, addr, id); 126 127 return true; 128 } 129 130 /* 131 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node 132 * @bus: SDW bus instance 133 * 134 * Scans Master ACPI node for SDW child Slave devices and registers it. 135 */ 136 int sdw_acpi_find_slaves(struct sdw_bus *bus) 137 { 138 struct acpi_device *adev, *parent; 139 struct acpi_device *adev2, *parent2; 140 141 parent = ACPI_COMPANION(bus->dev); 142 if (!parent) { 143 dev_err(bus->dev, "Can't find parent for acpi bind\n"); 144 return -ENODEV; 145 } 146 147 list_for_each_entry(adev, &parent->children, node) { 148 struct sdw_slave_id id; 149 struct sdw_slave_id id2; 150 bool ignore_unique_id = true; 151 152 if (!find_slave(bus, adev, &id)) 153 continue; 154 155 /* brute-force O(N^2) search for duplicates */ 156 parent2 = parent; 157 list_for_each_entry(adev2, &parent2->children, node) { 158 159 if (adev == adev2) 160 continue; 161 162 if (!find_slave(bus, adev2, &id2)) 163 continue; 164 165 if (id.sdw_version != id2.sdw_version || 166 id.mfg_id != id2.mfg_id || 167 id.part_id != id2.part_id || 168 id.class_id != id2.class_id) 169 continue; 170 171 if (id.unique_id != id2.unique_id) { 172 dev_dbg(bus->dev, 173 "Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 174 id.unique_id, id2.unique_id, id.mfg_id, id.part_id); 175 ignore_unique_id = false; 176 } else { 177 dev_err(bus->dev, 178 "Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 179 id.unique_id, id2.unique_id, id.mfg_id, id.part_id); 180 return -ENODEV; 181 } 182 } 183 184 if (ignore_unique_id) 185 id.unique_id = SDW_IGNORED_UNIQUE_ID; 186 187 /* 188 * don't error check for sdw_slave_add as we want to continue 189 * adding Slaves 190 */ 191 sdw_slave_add(bus, &id, acpi_fwnode_handle(adev)); 192 } 193 194 return 0; 195 } 196 197 #endif 198 199 /* 200 * sdw_of_find_slaves() - Find Slave devices in master device tree node 201 * @bus: SDW bus instance 202 * 203 * Scans Master DT node for SDW child Slave devices and registers it. 204 */ 205 int sdw_of_find_slaves(struct sdw_bus *bus) 206 { 207 struct device *dev = bus->dev; 208 struct device_node *node; 209 210 for_each_child_of_node(bus->dev->of_node, node) { 211 int link_id, ret, len; 212 unsigned int sdw_version; 213 const char *compat = NULL; 214 struct sdw_slave_id id; 215 const __be32 *addr; 216 217 compat = of_get_property(node, "compatible", NULL); 218 if (!compat) 219 continue; 220 221 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version, 222 &id.mfg_id, &id.part_id, &id.class_id); 223 224 if (ret != 4) { 225 dev_err(dev, "Invalid compatible string found %s\n", 226 compat); 227 continue; 228 } 229 230 addr = of_get_property(node, "reg", &len); 231 if (!addr || (len < 2 * sizeof(u32))) { 232 dev_err(dev, "Invalid Link and Instance ID\n"); 233 continue; 234 } 235 236 link_id = be32_to_cpup(addr++); 237 id.unique_id = be32_to_cpup(addr); 238 id.sdw_version = sdw_version; 239 240 /* Check for link_id match */ 241 if (link_id != bus->link_id) 242 continue; 243 244 sdw_slave_add(bus, &id, of_fwnode_handle(node)); 245 } 246 247 return 0; 248 } 249