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 const 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:ctrl:link:mfg:part:class */ 43 dev_set_name(&slave->dev, "sdw:%01x:%01x:%04x:%04x:%02x", 44 bus->controller_id, bus->link_id, id->mfg_id, id->part_id, 45 id->class_id); 46 } else { 47 /* name shall be sdw:ctrl:link:mfg:part:class:unique */ 48 dev_set_name(&slave->dev, "sdw:%01x:%01x:%04x:%04x:%02x:%01x", 49 bus->controller_id, 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 unsigned int link_id; 101 u64 addr; 102 int ret; 103 104 ret = acpi_get_local_u64_address(adev->handle, &addr); 105 if (ret < 0) 106 return false; 107 108 if (bus->ops->override_adr) 109 addr = bus->ops->override_adr(bus, addr); 110 111 if (!addr) 112 return false; 113 114 /* Extract link id from ADR, Bit 51 to 48 (included) */ 115 link_id = SDW_DISCO_LINK_ID(addr); 116 117 /* Check for link_id match */ 118 if (link_id != bus->link_id) 119 return false; 120 121 sdw_extract_slave_id(bus, addr, id); 122 123 return true; 124 } 125 126 struct sdw_acpi_child_walk_data { 127 struct sdw_bus *bus; 128 struct acpi_device *adev; 129 struct sdw_slave_id id; 130 bool ignore_unique_id; 131 }; 132 133 static int sdw_acpi_check_duplicate(struct acpi_device *adev, void *data) 134 { 135 struct sdw_acpi_child_walk_data *cwd = data; 136 struct sdw_bus *bus = cwd->bus; 137 struct sdw_slave_id id; 138 139 if (adev == cwd->adev) 140 return 0; 141 142 if (!find_slave(bus, adev, &id)) 143 return 0; 144 145 if (cwd->id.sdw_version != id.sdw_version || cwd->id.mfg_id != id.mfg_id || 146 cwd->id.part_id != id.part_id || cwd->id.class_id != id.class_id) 147 return 0; 148 149 if (cwd->id.unique_id != id.unique_id) { 150 dev_dbg(bus->dev, 151 "Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 152 cwd->id.unique_id, id.unique_id, cwd->id.mfg_id, 153 cwd->id.part_id); 154 cwd->ignore_unique_id = false; 155 return 0; 156 } 157 158 dev_err(bus->dev, 159 "Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", 160 cwd->id.unique_id, id.unique_id, cwd->id.mfg_id, cwd->id.part_id); 161 return -ENODEV; 162 } 163 164 static int sdw_acpi_find_one(struct acpi_device *adev, void *data) 165 { 166 struct sdw_bus *bus = data; 167 struct sdw_acpi_child_walk_data cwd = { 168 .bus = bus, 169 .adev = adev, 170 .ignore_unique_id = true, 171 }; 172 int ret; 173 174 if (!find_slave(bus, adev, &cwd.id)) 175 return 0; 176 177 /* Brute-force O(N^2) search for duplicates. */ 178 ret = acpi_dev_for_each_child(ACPI_COMPANION(bus->dev), 179 sdw_acpi_check_duplicate, &cwd); 180 if (ret) 181 return ret; 182 183 if (cwd.ignore_unique_id) 184 cwd.id.unique_id = SDW_IGNORED_UNIQUE_ID; 185 186 /* Ignore errors and continue. */ 187 sdw_slave_add(bus, &cwd.id, acpi_fwnode_handle(adev)); 188 return 0; 189 } 190 191 /* 192 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node 193 * @bus: SDW bus instance 194 * 195 * Scans Master ACPI node for SDW child Slave devices and registers it. 196 */ 197 int sdw_acpi_find_slaves(struct sdw_bus *bus) 198 { 199 struct acpi_device *parent; 200 201 parent = ACPI_COMPANION(bus->dev); 202 if (!parent) { 203 dev_err(bus->dev, "Can't find parent for acpi bind\n"); 204 return -ENODEV; 205 } 206 207 return acpi_dev_for_each_child(parent, sdw_acpi_find_one, bus); 208 } 209 210 #endif 211 212 /* 213 * sdw_of_find_slaves() - Find Slave devices in master device tree node 214 * @bus: SDW bus instance 215 * 216 * Scans Master DT node for SDW child Slave devices and registers it. 217 */ 218 int sdw_of_find_slaves(struct sdw_bus *bus) 219 { 220 struct device *dev = bus->dev; 221 struct device_node *node; 222 223 for_each_child_of_node(bus->dev->of_node, node) { 224 int link_id, ret, len; 225 unsigned int sdw_version; 226 const char *compat = NULL; 227 struct sdw_slave_id id; 228 const __be32 *addr; 229 230 compat = of_get_property(node, "compatible", NULL); 231 if (!compat) 232 continue; 233 234 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version, 235 &id.mfg_id, &id.part_id, &id.class_id); 236 237 if (ret != 4) { 238 dev_err(dev, "Invalid compatible string found %s\n", 239 compat); 240 continue; 241 } 242 243 addr = of_get_property(node, "reg", &len); 244 if (!addr || (len < 2 * sizeof(u32))) { 245 dev_err(dev, "Invalid Link and Instance ID\n"); 246 continue; 247 } 248 249 link_id = be32_to_cpup(addr++); 250 id.unique_id = be32_to_cpup(addr); 251 id.sdw_version = sdw_version; 252 253 /* Check for link_id match */ 254 if (link_id != bus->link_id) 255 continue; 256 257 sdw_slave_add(bus, &id, of_fwnode_handle(node)); 258 } 259 260 return 0; 261 } 262