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 mutex_destroy(&slave->sdw_dev_lock); 16 kfree(slave); 17 } 18 19 struct device_type sdw_slave_type = { 20 .name = "sdw_slave", 21 .release = sdw_slave_release, 22 .uevent = sdw_slave_uevent, 23 }; 24 25 int sdw_slave_add(struct sdw_bus *bus, 26 struct sdw_slave_id *id, struct fwnode_handle *fwnode) 27 { 28 struct sdw_slave *slave; 29 int ret; 30 int i; 31 32 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 33 if (!slave) 34 return -ENOMEM; 35 36 /* Initialize data structure */ 37 memcpy(&slave->id, id, sizeof(*id)); 38 slave->dev.parent = bus->dev; 39 slave->dev.fwnode = fwnode; 40 41 if (id->unique_id == SDW_IGNORED_UNIQUE_ID) { 42 /* name shall be sdw:link:mfg:part:class */ 43 dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x", 44 bus->link_id, id->mfg_id, id->part_id, 45 id->class_id); 46 } else { 47 /* name shall be sdw:link:mfg:part:class:unique */ 48 dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x:%01x", 49 bus->link_id, id->mfg_id, id->part_id, 50 id->class_id, id->unique_id); 51 } 52 53 slave->dev.bus = &sdw_bus_type; 54 slave->dev.of_node = of_node_get(to_of_node(fwnode)); 55 slave->dev.type = &sdw_slave_type; 56 slave->dev.groups = sdw_slave_status_attr_groups; 57 slave->bus = bus; 58 slave->status = SDW_SLAVE_UNATTACHED; 59 init_completion(&slave->enumeration_complete); 60 init_completion(&slave->initialization_complete); 61 slave->dev_num = 0; 62 slave->probed = false; 63 slave->first_interrupt_done = false; 64 mutex_init(&slave->sdw_dev_lock); 65 66 for (i = 0; i < SDW_MAX_PORTS; i++) 67 init_completion(&slave->port_ready[i]); 68 69 mutex_lock(&bus->bus_lock); 70 list_add_tail(&slave->node, &bus->slaves); 71 mutex_unlock(&bus->bus_lock); 72 73 ret = device_register(&slave->dev); 74 if (ret) { 75 dev_err(bus->dev, "Failed to add slave: ret %d\n", ret); 76 77 /* 78 * On err, don't free but drop ref as this will be freed 79 * when release method is invoked. 80 */ 81 mutex_lock(&bus->bus_lock); 82 list_del(&slave->node); 83 mutex_unlock(&bus->bus_lock); 84 put_device(&slave->dev); 85 86 return ret; 87 } 88 sdw_slave_debugfs_init(slave); 89 90 return ret; 91 } 92 EXPORT_SYMBOL(sdw_slave_add); 93 94 #if IS_ENABLED(CONFIG_ACPI) 95 96 static bool find_slave(struct sdw_bus *bus, 97 struct acpi_device *adev, 98 struct sdw_slave_id *id) 99 { 100 u64 addr; 101 unsigned int link_id; 102 acpi_status status; 103 104 status = acpi_evaluate_integer(adev->handle, 105 METHOD_NAME__ADR, NULL, &addr); 106 107 if (ACPI_FAILURE(status)) { 108 dev_err(bus->dev, "_ADR resolution failed: %x\n", 109 status); 110 return false; 111 } 112 113 if (bus->ops->override_adr) 114 addr = bus->ops->override_adr(bus, addr); 115 116 if (!addr) 117 return false; 118 119 /* Extract link id from ADR, Bit 51 to 48 (included) */ 120 link_id = SDW_DISCO_LINK_ID(addr); 121 122 /* Check for link_id match */ 123 if (link_id != bus->link_id) 124 return false; 125 126 sdw_extract_slave_id(bus, addr, id); 127 128 return true; 129 } 130 131 /* 132 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node 133 * @bus: SDW bus instance 134 * 135 * Scans Master ACPI node for SDW child Slave devices and registers it. 136 */ 137 int sdw_acpi_find_slaves(struct sdw_bus *bus) 138 { 139 struct acpi_device *adev, *parent; 140 struct acpi_device *adev2, *parent2; 141 142 parent = ACPI_COMPANION(bus->dev); 143 if (!parent) { 144 dev_err(bus->dev, "Can't find parent for acpi bind\n"); 145 return -ENODEV; 146 } 147 148 list_for_each_entry(adev, &parent->children, node) { 149 struct sdw_slave_id id; 150 struct sdw_slave_id id2; 151 bool ignore_unique_id = true; 152 153 if (!find_slave(bus, adev, &id)) 154 continue; 155 156 /* brute-force O(N^2) search for duplicates */ 157 parent2 = parent; 158 list_for_each_entry(adev2, &parent2->children, node) { 159 160 if (adev == adev2) 161 continue; 162 163 if (!find_slave(bus, adev2, &id2)) 164 continue; 165 166 if (id.sdw_version != id2.sdw_version || 167 id.mfg_id != id2.mfg_id || 168 id.part_id != id2.part_id || 169 id.class_id != id2.class_id) 170 continue; 171 172 if (id.unique_id != id2.unique_id) { 173 dev_dbg(bus->dev, 174 "Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 175 id.unique_id, id2.unique_id, id.mfg_id, id.part_id); 176 ignore_unique_id = false; 177 } else { 178 dev_err(bus->dev, 179 "Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 180 id.unique_id, id2.unique_id, id.mfg_id, id.part_id); 181 return -ENODEV; 182 } 183 } 184 185 if (ignore_unique_id) 186 id.unique_id = SDW_IGNORED_UNIQUE_ID; 187 188 /* 189 * don't error check for sdw_slave_add as we want to continue 190 * adding Slaves 191 */ 192 sdw_slave_add(bus, &id, acpi_fwnode_handle(adev)); 193 } 194 195 return 0; 196 } 197 198 #endif 199 200 /* 201 * sdw_of_find_slaves() - Find Slave devices in master device tree node 202 * @bus: SDW bus instance 203 * 204 * Scans Master DT node for SDW child Slave devices and registers it. 205 */ 206 int sdw_of_find_slaves(struct sdw_bus *bus) 207 { 208 struct device *dev = bus->dev; 209 struct device_node *node; 210 211 for_each_child_of_node(bus->dev->of_node, node) { 212 int link_id, ret, len; 213 unsigned int sdw_version; 214 const char *compat = NULL; 215 struct sdw_slave_id id; 216 const __be32 *addr; 217 218 compat = of_get_property(node, "compatible", NULL); 219 if (!compat) 220 continue; 221 222 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version, 223 &id.mfg_id, &id.part_id, &id.class_id); 224 225 if (ret != 4) { 226 dev_err(dev, "Invalid compatible string found %s\n", 227 compat); 228 continue; 229 } 230 231 addr = of_get_property(node, "reg", &len); 232 if (!addr || (len < 2 * sizeof(u32))) { 233 dev_err(dev, "Invalid Link and Instance ID\n"); 234 continue; 235 } 236 237 link_id = be32_to_cpup(addr++); 238 id.unique_id = be32_to_cpup(addr); 239 id.sdw_version = sdw_version; 240 241 /* Check for link_id match */ 242 if (link_id != bus->link_id) 243 continue; 244 245 sdw_slave_add(bus, &id, of_fwnode_handle(node)); 246 } 247 248 return 0; 249 } 250