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