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 struct sdw_acpi_child_walk_data { 132 struct sdw_bus *bus; 133 struct acpi_device *adev; 134 struct sdw_slave_id id; 135 bool ignore_unique_id; 136 }; 137 138 static int sdw_acpi_check_duplicate(struct acpi_device *adev, void *data) 139 { 140 struct sdw_acpi_child_walk_data *cwd = data; 141 struct sdw_bus *bus = cwd->bus; 142 struct sdw_slave_id id; 143 144 if (adev == cwd->adev) 145 return 0; 146 147 if (!find_slave(bus, adev, &id)) 148 return 0; 149 150 if (cwd->id.sdw_version != id.sdw_version || cwd->id.mfg_id != id.mfg_id || 151 cwd->id.part_id != id.part_id || cwd->id.class_id != id.class_id) 152 return 0; 153 154 if (cwd->id.unique_id != id.unique_id) { 155 dev_dbg(bus->dev, 156 "Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 157 cwd->id.unique_id, id.unique_id, cwd->id.mfg_id, 158 cwd->id.part_id); 159 cwd->ignore_unique_id = false; 160 return 0; 161 } 162 163 dev_err(bus->dev, 164 "Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 165 cwd->id.unique_id, id.unique_id, cwd->id.mfg_id, cwd->id.part_id); 166 return -ENODEV; 167 } 168 169 static int sdw_acpi_find_one(struct acpi_device *adev, void *data) 170 { 171 struct sdw_bus *bus = data; 172 struct sdw_acpi_child_walk_data cwd = { 173 .bus = bus, 174 .adev = adev, 175 .ignore_unique_id = true, 176 }; 177 int ret; 178 179 if (!find_slave(bus, adev, &cwd.id)) 180 return 0; 181 182 /* Brute-force O(N^2) search for duplicates. */ 183 ret = acpi_dev_for_each_child(ACPI_COMPANION(bus->dev), 184 sdw_acpi_check_duplicate, &cwd); 185 if (ret) 186 return ret; 187 188 if (cwd.ignore_unique_id) 189 cwd.id.unique_id = SDW_IGNORED_UNIQUE_ID; 190 191 /* Ignore errors and continue. */ 192 sdw_slave_add(bus, &cwd.id, acpi_fwnode_handle(adev)); 193 return 0; 194 } 195 196 /* 197 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node 198 * @bus: SDW bus instance 199 * 200 * Scans Master ACPI node for SDW child Slave devices and registers it. 201 */ 202 int sdw_acpi_find_slaves(struct sdw_bus *bus) 203 { 204 struct acpi_device *parent; 205 206 parent = ACPI_COMPANION(bus->dev); 207 if (!parent) { 208 dev_err(bus->dev, "Can't find parent for acpi bind\n"); 209 return -ENODEV; 210 } 211 212 return acpi_dev_for_each_child(parent, sdw_acpi_find_one, bus); 213 } 214 215 #endif 216 217 /* 218 * sdw_of_find_slaves() - Find Slave devices in master device tree node 219 * @bus: SDW bus instance 220 * 221 * Scans Master DT node for SDW child Slave devices and registers it. 222 */ 223 int sdw_of_find_slaves(struct sdw_bus *bus) 224 { 225 struct device *dev = bus->dev; 226 struct device_node *node; 227 228 for_each_child_of_node(bus->dev->of_node, node) { 229 int link_id, ret, len; 230 unsigned int sdw_version; 231 const char *compat = NULL; 232 struct sdw_slave_id id; 233 const __be32 *addr; 234 235 compat = of_get_property(node, "compatible", NULL); 236 if (!compat) 237 continue; 238 239 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version, 240 &id.mfg_id, &id.part_id, &id.class_id); 241 242 if (ret != 4) { 243 dev_err(dev, "Invalid compatible string found %s\n", 244 compat); 245 continue; 246 } 247 248 addr = of_get_property(node, "reg", &len); 249 if (!addr || (len < 2 * sizeof(u32))) { 250 dev_err(dev, "Invalid Link and Instance ID\n"); 251 continue; 252 } 253 254 link_id = be32_to_cpup(addr++); 255 id.unique_id = be32_to_cpup(addr); 256 id.sdw_version = sdw_version; 257 258 /* Check for link_id match */ 259 if (link_id != bus->link_id) 260 continue; 261 262 sdw_slave_add(bus, &id, of_fwnode_handle(node)); 263 } 264 265 return 0; 266 } 267