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 92 #if IS_ENABLED(CONFIG_ACPI) 93 94 static bool find_slave(struct sdw_bus *bus, 95 struct acpi_device *adev, 96 struct sdw_slave_id *id) 97 { 98 unsigned long long addr; 99 unsigned int link_id; 100 acpi_status status; 101 102 status = acpi_evaluate_integer(adev->handle, 103 METHOD_NAME__ADR, NULL, &addr); 104 105 if (ACPI_FAILURE(status)) { 106 dev_err(bus->dev, "_ADR resolution failed: %x\n", 107 status); 108 return false; 109 } 110 111 /* Extract link id from ADR, Bit 51 to 48 (included) */ 112 link_id = SDW_DISCO_LINK_ID(addr); 113 114 /* Check for link_id match */ 115 if (link_id != bus->link_id) 116 return false; 117 118 sdw_extract_slave_id(bus, addr, id); 119 120 return true; 121 } 122 123 /* 124 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node 125 * @bus: SDW bus instance 126 * 127 * Scans Master ACPI node for SDW child Slave devices and registers it. 128 */ 129 int sdw_acpi_find_slaves(struct sdw_bus *bus) 130 { 131 struct acpi_device *adev, *parent; 132 struct acpi_device *adev2, *parent2; 133 134 parent = ACPI_COMPANION(bus->dev); 135 if (!parent) { 136 dev_err(bus->dev, "Can't find parent for acpi bind\n"); 137 return -ENODEV; 138 } 139 140 list_for_each_entry(adev, &parent->children, node) { 141 struct sdw_slave_id id; 142 struct sdw_slave_id id2; 143 bool ignore_unique_id = true; 144 145 if (!find_slave(bus, adev, &id)) 146 continue; 147 148 /* brute-force O(N^2) search for duplicates */ 149 parent2 = parent; 150 list_for_each_entry(adev2, &parent2->children, node) { 151 152 if (adev == adev2) 153 continue; 154 155 if (!find_slave(bus, adev2, &id2)) 156 continue; 157 158 if (id.sdw_version != id2.sdw_version || 159 id.mfg_id != id2.mfg_id || 160 id.part_id != id2.part_id || 161 id.class_id != id2.class_id) 162 continue; 163 164 if (id.unique_id != id2.unique_id) { 165 dev_dbg(bus->dev, 166 "Valid unique IDs %x %x for Slave mfg %x part %d\n", 167 id.unique_id, id2.unique_id, 168 id.mfg_id, id.part_id); 169 ignore_unique_id = false; 170 } else { 171 dev_err(bus->dev, 172 "Invalid unique IDs %x %x for Slave mfg %x part %d\n", 173 id.unique_id, id2.unique_id, 174 id.mfg_id, id.part_id); 175 return -ENODEV; 176 } 177 } 178 179 if (ignore_unique_id) 180 id.unique_id = SDW_IGNORED_UNIQUE_ID; 181 182 /* 183 * don't error check for sdw_slave_add as we want to continue 184 * adding Slaves 185 */ 186 sdw_slave_add(bus, &id, acpi_fwnode_handle(adev)); 187 } 188 189 return 0; 190 } 191 192 #endif 193 194 /* 195 * sdw_of_find_slaves() - Find Slave devices in master device tree node 196 * @bus: SDW bus instance 197 * 198 * Scans Master DT node for SDW child Slave devices and registers it. 199 */ 200 int sdw_of_find_slaves(struct sdw_bus *bus) 201 { 202 struct device *dev = bus->dev; 203 struct device_node *node; 204 205 for_each_child_of_node(bus->dev->of_node, node) { 206 int link_id, ret, len; 207 unsigned int sdw_version; 208 const char *compat = NULL; 209 struct sdw_slave_id id; 210 const __be32 *addr; 211 212 compat = of_get_property(node, "compatible", NULL); 213 if (!compat) 214 continue; 215 216 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version, 217 &id.mfg_id, &id.part_id, &id.class_id); 218 219 if (ret != 4) { 220 dev_err(dev, "Invalid compatible string found %s\n", 221 compat); 222 continue; 223 } 224 225 addr = of_get_property(node, "reg", &len); 226 if (!addr || (len < 2 * sizeof(u32))) { 227 dev_err(dev, "Invalid Link and Instance ID\n"); 228 continue; 229 } 230 231 link_id = be32_to_cpup(addr++); 232 id.unique_id = be32_to_cpup(addr); 233 id.sdw_version = sdw_version; 234 235 /* Check for link_id match */ 236 if (link_id != bus->link_id) 237 continue; 238 239 sdw_slave_add(bus, &id, of_fwnode_handle(node)); 240 } 241 242 return 0; 243 } 244