| Vinod Koul | 7c3cd18 | 2017-12-14 11:19:34 +0530 | [diff] [blame] | 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/soundwire/sdw.h> |
| 6 | #include <linux/soundwire/sdw_type.h> |
| 7 | #include "bus.h" |
| 8 | |
| 9 | static void sdw_slave_release(struct device *dev) |
| 10 | { |
| 11 | struct sdw_slave *slave = dev_to_sdw_dev(dev); |
| 12 | |
| 13 | kfree(slave); |
| 14 | } |
| 15 | |
| 16 | static int sdw_slave_add(struct sdw_bus *bus, |
| 17 | struct sdw_slave_id *id, struct fwnode_handle *fwnode) |
| 18 | { |
| 19 | struct sdw_slave *slave; |
| 20 | int ret; |
| 21 | |
| 22 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
| 23 | if (!slave) |
| 24 | return -ENOMEM; |
| 25 | |
| 26 | /* Initialize data structure */ |
| 27 | memcpy(&slave->id, id, sizeof(*id)); |
| 28 | slave->dev.parent = bus->dev; |
| 29 | slave->dev.fwnode = fwnode; |
| 30 | |
| 31 | /* name shall be sdw:link:mfg:part:class:unique */ |
| 32 | dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x", |
| 33 | bus->link_id, id->mfg_id, id->part_id, |
| 34 | id->class_id, id->unique_id); |
| 35 | |
| 36 | slave->dev.release = sdw_slave_release; |
| 37 | slave->dev.bus = &sdw_bus_type; |
| 38 | slave->bus = bus; |
| 39 | slave->status = SDW_SLAVE_UNATTACHED; |
| 40 | slave->dev_num = 0; |
| 41 | |
| 42 | mutex_lock(&bus->bus_lock); |
| 43 | list_add_tail(&slave->node, &bus->slaves); |
| 44 | mutex_unlock(&bus->bus_lock); |
| 45 | |
| 46 | ret = device_register(&slave->dev); |
| 47 | if (ret) { |
| 48 | dev_err(bus->dev, "Failed to add slave: ret %d\n", ret); |
| 49 | |
| 50 | /* |
| 51 | * On err, don't free but drop ref as this will be freed |
| 52 | * when release method is invoked. |
| 53 | */ |
| 54 | mutex_lock(&bus->bus_lock); |
| 55 | list_del(&slave->node); |
| 56 | mutex_unlock(&bus->bus_lock); |
| 57 | put_device(&slave->dev); |
| 58 | } |
| 59 | |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | #if IS_ENABLED(CONFIG_ACPI) |
| 64 | /* |
| 65 | * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node |
| 66 | * @bus: SDW bus instance |
| 67 | * |
| 68 | * Scans Master ACPI node for SDW child Slave devices and registers it. |
| 69 | */ |
| 70 | int sdw_acpi_find_slaves(struct sdw_bus *bus) |
| 71 | { |
| 72 | struct acpi_device *adev, *parent; |
| 73 | |
| 74 | parent = ACPI_COMPANION(bus->dev); |
| 75 | if (!parent) { |
| 76 | dev_err(bus->dev, "Can't find parent for acpi bind\n"); |
| 77 | return -ENODEV; |
| 78 | } |
| 79 | |
| 80 | list_for_each_entry(adev, &parent->children, node) { |
| 81 | unsigned long long addr; |
| 82 | struct sdw_slave_id id; |
| 83 | unsigned int link_id; |
| 84 | acpi_status status; |
| 85 | |
| 86 | status = acpi_evaluate_integer(adev->handle, |
| 87 | METHOD_NAME__ADR, NULL, &addr); |
| 88 | |
| 89 | if (ACPI_FAILURE(status)) { |
| 90 | dev_err(bus->dev, "_ADR resolution failed: %x\n", |
| 91 | status); |
| 92 | return status; |
| 93 | } |
| 94 | |
| 95 | /* Extract link id from ADR, Bit 51 to 48 (included) */ |
| 96 | link_id = (addr >> 48) & GENMASK(3, 0); |
| 97 | |
| 98 | /* Check for link_id match */ |
| 99 | if (link_id != bus->link_id) |
| 100 | continue; |
| 101 | |
| 102 | sdw_extract_slave_id(bus, addr, &id); |
| 103 | |
| 104 | /* |
| 105 | * don't error check for sdw_slave_add as we want to continue |
| 106 | * adding Slaves |
| 107 | */ |
| 108 | sdw_slave_add(bus, &id, acpi_fwnode_handle(adev)); |
| 109 | } |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | #endif |