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