From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/soundwire/slave.c | 286 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 286 insertions(+) create mode 100644 drivers/soundwire/slave.c (limited to 'drivers/soundwire/slave.c') diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c new file mode 100644 index 000000000..e0c49cbcb --- /dev/null +++ b/drivers/soundwire/slave.c @@ -0,0 +1,286 @@ +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) +// Copyright(c) 2015-17 Intel Corporation. + +#include +#include +#include +#include +#include +#include "bus.h" +#include "sysfs_local.h" + +static void sdw_slave_release(struct device *dev) +{ + struct sdw_slave *slave = dev_to_sdw_dev(dev); + + of_node_put(slave->dev.of_node); + mutex_destroy(&slave->sdw_dev_lock); + kfree(slave); +} + +const struct device_type sdw_slave_type = { + .name = "sdw_slave", + .release = sdw_slave_release, + .uevent = sdw_slave_uevent, +}; +EXPORT_SYMBOL_GPL(sdw_slave_type); + +int sdw_slave_add(struct sdw_bus *bus, + struct sdw_slave_id *id, struct fwnode_handle *fwnode) +{ + struct sdw_slave *slave; + int ret; + int i; + + slave = kzalloc_obj(*slave); + if (!slave) + return -ENOMEM; + + /* Initialize data structure */ + memcpy(&slave->id, id, sizeof(*id)); + slave->dev.parent = bus->dev; + slave->dev.fwnode = fwnode; + + if (id->unique_id == SDW_IGNORED_UNIQUE_ID) { + /* name shall be sdw:ctrl:link:mfg:part:class */ + dev_set_name(&slave->dev, "sdw:%01x:%01x:%04x:%04x:%02x", + bus->controller_id, bus->link_id, id->mfg_id, id->part_id, + id->class_id); + } else { + /* name shall be sdw:ctrl:link:mfg:part:class:unique */ + dev_set_name(&slave->dev, "sdw:%01x:%01x:%04x:%04x:%02x:%01x", + bus->controller_id, bus->link_id, id->mfg_id, id->part_id, + id->class_id, id->unique_id); + } + + slave->dev.bus = &sdw_bus_type; + slave->dev.of_node = of_node_get(to_of_node(fwnode)); + slave->dev.type = &sdw_slave_type; + slave->dev.groups = sdw_slave_status_attr_groups; + slave->bus = bus; + slave->status = SDW_SLAVE_UNATTACHED; + init_completion(&slave->enumeration_complete); + init_completion(&slave->initialization_complete); + slave->dev_num = 0; + slave->probed = false; + slave->first_interrupt_done = false; + mutex_init(&slave->sdw_dev_lock); + + for (i = 0; i < SDW_MAX_PORTS; i++) + init_completion(&slave->port_ready[i]); + + mutex_lock(&bus->bus_lock); + list_add_tail(&slave->node, &bus->slaves); + mutex_unlock(&bus->bus_lock); + + /* + * The Soundwire driver probe may optionally register SDCA + * sub-devices, one per Function. This means the information + * on the SDCA revision and the number/type of Functions need + * to be extracted from platform firmware before the SoundWire + * driver probe, and as a consequence before the SoundWire + * device_register() below. + */ + sdca_lookup_interface_revision(slave); + sdca_lookup_functions(slave); + + ret = device_register(&slave->dev); + if (ret) { + dev_err(bus->dev, "Failed to add slave: ret %d\n", ret); + + /* + * On err, don't free but drop ref as this will be freed + * when release method is invoked. + */ + mutex_lock(&bus->bus_lock); + list_del(&slave->node); + mutex_unlock(&bus->bus_lock); + put_device(&slave->dev); + + return ret; + } + sdw_slave_debugfs_init(slave); + + return ret; +} +EXPORT_SYMBOL(sdw_slave_add); + +#if IS_ENABLED(CONFIG_ACPI) + +static bool find_slave(struct sdw_bus *bus, + struct acpi_device *adev, + struct sdw_slave_id *id) +{ + unsigned int link_id; + u64 addr; + int ret; + + if (acpi_bus_get_status(adev) || !acpi_dev_ready_for_enumeration(adev)) + return false; + + ret = acpi_get_local_u64_address(adev->handle, &addr); + if (ret < 0) + return false; + + if (bus->ops->override_adr) + addr = bus->ops->override_adr(bus, addr); + + if (!addr) + return false; + + /* Extract link id from ADR, Bit 51 to 48 (included) */ + link_id = SDW_DISCO_LINK_ID(addr); + + /* Check for link_id match */ + if (link_id != bus->link_id) + return false; + + sdw_extract_slave_id(bus, addr, id); + + return true; +} + +struct sdw_acpi_child_walk_data { + struct sdw_bus *bus; + struct acpi_device *adev; + struct sdw_slave_id id; + bool ignore_unique_id; +}; + +static int sdw_acpi_check_duplicate(struct acpi_device *adev, void *data) +{ + struct sdw_acpi_child_walk_data *cwd = data; + struct sdw_bus *bus = cwd->bus; + struct sdw_slave_id id; + + if (adev == cwd->adev) + return 0; + + if (!find_slave(bus, adev, &id)) + return 0; + + if (cwd->id.sdw_version != id.sdw_version || cwd->id.mfg_id != id.mfg_id || + cwd->id.part_id != id.part_id || cwd->id.class_id != id.class_id) + return 0; + + if (cwd->id.unique_id != id.unique_id) { + dev_dbg(bus->dev, + "Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", + cwd->id.unique_id, id.unique_id, cwd->id.mfg_id, + cwd->id.part_id); + cwd->ignore_unique_id = false; + return 0; + } + + dev_err(bus->dev, + "Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", + cwd->id.unique_id, id.unique_id, cwd->id.mfg_id, cwd->id.part_id); + return -ENODEV; +} + +static int sdw_acpi_find_one(struct acpi_device *adev, void *data) +{ + struct sdw_bus *bus = data; + struct sdw_acpi_child_walk_data cwd = { + .bus = bus, + .adev = adev, + .ignore_unique_id = true, + }; + int ret; + + if (!find_slave(bus, adev, &cwd.id)) + return 0; + + /* Brute-force O(N^2) search for duplicates. */ + ret = acpi_dev_for_each_child(ACPI_COMPANION(bus->dev), + sdw_acpi_check_duplicate, &cwd); + if (ret) + return ret; + + if (cwd.ignore_unique_id) + cwd.id.unique_id = SDW_IGNORED_UNIQUE_ID; + + /* Ignore errors and continue. */ + sdw_slave_add(bus, &cwd.id, acpi_fwnode_handle(adev)); + return 0; +} + +/* + * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node + * @bus: SDW bus instance + * + * Scans Master ACPI node for SDW child Slave devices and registers it. + */ +int sdw_acpi_find_slaves(struct sdw_bus *bus) +{ + struct acpi_device *parent; + + parent = ACPI_COMPANION(bus->dev); + if (!parent) { + dev_err(bus->dev, "Can't find parent for acpi bind\n"); + return -ENODEV; + } + + return acpi_dev_for_each_child(parent, sdw_acpi_find_one, bus); +} + +#endif + +/* + * sdw_of_find_slaves() - Find Slave devices in master device tree node + * @bus: SDW bus instance + * + * Scans Master DT node for SDW child Slave devices and registers it. + */ +int sdw_of_find_slaves(struct sdw_bus *bus) +{ + struct device *dev = bus->dev; + struct device_node *node; + + for_each_child_of_node(bus->dev->of_node, node) { + int link_id, ret, len; + unsigned int sdw_version; + const char *compat = NULL; + struct sdw_slave_id id; + const __be32 *addr; + + ret = of_property_read_string(node, "compatible", &compat); + if (ret) + continue; + + ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version, + &id.mfg_id, &id.part_id, &id.class_id); + + if (ret != 4) { + dev_err(dev, "Invalid compatible string found %s\n", + compat); + continue; + } + + addr = of_get_property(node, "reg", &len); + if (!addr || (len < 2 * sizeof(u32))) { + dev_err(dev, "Invalid Link and Instance ID\n"); + continue; + } + + link_id = be32_to_cpup(addr++); + id.unique_id = be32_to_cpup(addr); + id.sdw_version = sdw_version; + + /* Check for link_id match */ + if (link_id != bus->link_id) + continue; + + sdw_slave_add(bus, &id, of_fwnode_handle(node)); + } + + return 0; +} + +struct device *of_sdw_find_device_by_node(struct device_node *np) +{ + return bus_find_device_by_of_node(&sdw_bus_type, np); +} +EXPORT_SYMBOL_GPL(of_sdw_find_device_by_node); + +MODULE_IMPORT_NS("SND_SOC_SDCA"); -- cgit v1.3.1