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/acpi/device_sysfs.c | 651 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 651 insertions(+) create mode 100644 drivers/acpi/device_sysfs.c (limited to 'drivers/acpi/device_sysfs.c') diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c new file mode 100644 index 000000000..c5434b998 --- /dev/null +++ b/drivers/acpi/device_sysfs.c @@ -0,0 +1,651 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * drivers/acpi/device_sysfs.c - ACPI device sysfs attributes and modalias. + * + * Copyright (C) 2015, Intel Corp. + * Author: Mika Westerberg + * Author: Rafael J. Wysocki + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#include +#include +#include +#include + +#include "internal.h" + +static ssize_t acpi_object_path(acpi_handle handle, char *buf) +{ + struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; + int result; + + result = acpi_get_name(handle, ACPI_FULL_PATHNAME, &path); + if (result) + return result; + + result = sysfs_emit(buf, "%s\n", (char *)path.pointer); + kfree(path.pointer); + return result; +} + +struct acpi_data_node_attr { + struct attribute attr; + ssize_t (*show)(struct acpi_data_node *, char *); + ssize_t (*store)(struct acpi_data_node *, const char *, size_t count); +}; + +#define DATA_NODE_ATTR(_name) \ + static struct acpi_data_node_attr data_node_##_name = \ + __ATTR(_name, 0444, data_node_show_##_name, NULL) + +static ssize_t data_node_show_path(struct acpi_data_node *dn, char *buf) +{ + return dn->handle ? acpi_object_path(dn->handle, buf) : 0; +} + +DATA_NODE_ATTR(path); + +static struct attribute *acpi_data_node_default_attrs[] = { + &data_node_path.attr, + NULL +}; +ATTRIBUTE_GROUPS(acpi_data_node_default); + +#define to_data_node(k) container_of(k, struct acpi_data_node, kobj) +#define to_attr(a) container_of(a, struct acpi_data_node_attr, attr) + +static ssize_t acpi_data_node_attr_show(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + struct acpi_data_node *dn = to_data_node(kobj); + struct acpi_data_node_attr *dn_attr = to_attr(attr); + + return dn_attr->show ? dn_attr->show(dn, buf) : -ENXIO; +} + +static const struct sysfs_ops acpi_data_node_sysfs_ops = { + .show = acpi_data_node_attr_show, +}; + +static void acpi_data_node_release(struct kobject *kobj) +{ + struct acpi_data_node *dn = to_data_node(kobj); + + complete(&dn->kobj_done); +} + +static const struct kobj_type acpi_data_node_ktype = { + .sysfs_ops = &acpi_data_node_sysfs_ops, + .default_groups = acpi_data_node_default_groups, + .release = acpi_data_node_release, +}; + +static void acpi_expose_nondev_subnodes(struct kobject *kobj, + struct acpi_device_data *data) +{ + struct list_head *list = &data->subnodes; + struct acpi_data_node *dn; + + if (list_empty(list)) + return; + + list_for_each_entry(dn, list, sibling) { + int ret; + + init_completion(&dn->kobj_done); + ret = kobject_init_and_add(&dn->kobj, &acpi_data_node_ktype, + kobj, "%s", dn->name); + if (!ret) + acpi_expose_nondev_subnodes(&dn->kobj, &dn->data); + else if (dn->handle) + acpi_handle_err(dn->handle, "Failed to expose (%d)\n", ret); + } +} + +static void acpi_hide_nondev_subnodes(struct acpi_device_data *data) +{ + struct list_head *list = &data->subnodes; + struct acpi_data_node *dn; + + if (list_empty(list)) + return; + + list_for_each_entry_reverse(dn, list, sibling) { + acpi_hide_nondev_subnodes(&dn->data); + kobject_put(&dn->kobj); + } +} + +/** + * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent + * @acpi_dev: ACPI device object. + * @modalias: Buffer to print into. + * @size: Size of the buffer. + * + * Creates hid/cid(s) string needed for modalias and uevent + * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: + * char *modalias: "acpi:IBM0001:ACPI0001" + * Return: 0: no _HID and no _CID + * -EINVAL: output error + * -ENOMEM: output is truncated + */ +static int create_pnp_modalias(const struct acpi_device *acpi_dev, char *modalias, + int size) +{ + int len; + int count; + struct acpi_hardware_id *id; + + /* Avoid unnecessarily loading modules for non present devices. */ + if (!acpi_device_is_present(acpi_dev)) + return 0; + + /* + * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should + * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the + * device's list. + */ + count = 0; + list_for_each_entry(id, &acpi_dev->pnp.ids, list) + if (strcmp(id->id, ACPI_DT_NAMESPACE_HID)) + count++; + + if (!count) + return 0; + + len = snprintf(modalias, size, "acpi:"); + if (len >= size) + return -ENOMEM; + + size -= len; + + list_for_each_entry(id, &acpi_dev->pnp.ids, list) { + if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID)) + continue; + + count = snprintf(&modalias[len], size, "%s:", id->id); + + if (count >= size) + return -ENOMEM; + + len += count; + size -= count; + } + + return len; +} + +/** + * create_of_modalias - Creates DT compatible string for modalias and uevent + * @acpi_dev: ACPI device object. + * @modalias: Buffer to print into. + * @size: Size of the buffer. + * + * Expose DT compatible modalias as of:NnameTCcompatible. This function should + * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of + * ACPI/PNP IDs. + */ +static int create_of_modalias(const struct acpi_device *acpi_dev, char *modalias, + int size) +{ + struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; + const union acpi_object *of_compatible, *obj; + acpi_status status; + int len, count; + int i, nval; + char *c; + + status = acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf); + if (ACPI_FAILURE(status)) + return -ENODEV; + + /* DT strings are all in lower case */ + for (c = buf.pointer; *c != '\0'; c++) + *c = tolower(*c); + + len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer); + ACPI_FREE(buf.pointer); + + if (len >= size) + return -ENOMEM; + + size -= len; + + of_compatible = acpi_dev->data.of_compatible; + if (of_compatible->type == ACPI_TYPE_PACKAGE) { + nval = of_compatible->package.count; + obj = of_compatible->package.elements; + } else { /* Must be ACPI_TYPE_STRING. */ + nval = 1; + obj = of_compatible; + } + for (i = 0; i < nval; i++, obj++) { + count = snprintf(&modalias[len], size, "C%s", + obj->string.pointer); + + if (count >= size) + return -ENOMEM; + + len += count; + size -= count; + } + + return len; +} + +int __acpi_device_uevent_modalias(const struct acpi_device *adev, + struct kobj_uevent_env *env) +{ + int len; + + if (!adev) + return -ENODEV; + + if (list_empty(&adev->pnp.ids)) + return 0; + + if (add_uevent_var(env, "MODALIAS=")) + return -ENOMEM; + + if (adev->data.of_compatible) + len = create_of_modalias(adev, &env->buf[env->buflen - 1], + sizeof(env->buf) - env->buflen); + else + len = create_pnp_modalias(adev, &env->buf[env->buflen - 1], + sizeof(env->buf) - env->buflen); + if (len < 0) + return len; + + env->buflen += len; + + return 0; +} + +/** + * acpi_device_uevent_modalias - uevent modalias for ACPI-enumerated devices. + * @dev: Struct device to get ACPI device node. + * @env: Environment variables of the kobject uevent. + * + * Create the uevent modalias field for ACPI-enumerated devices. + * + * Because other buses do not support ACPI HIDs & CIDs, e.g. for a device with + * hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001". + */ +int acpi_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env) +{ + return __acpi_device_uevent_modalias(acpi_companion_match(dev), env); +} +EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); + +static int __acpi_device_modalias(const struct acpi_device *adev, char *buf, int size) +{ + int len, count; + + if (!adev) + return -ENODEV; + + if (list_empty(&adev->pnp.ids)) + return 0; + + len = create_pnp_modalias(adev, buf, size - 1); + if (len < 0) { + return len; + } else if (len > 0) { + buf[len++] = '\n'; + size -= len; + } + if (!adev->data.of_compatible) + return len; + + count = create_of_modalias(adev, buf + len, size - 1); + if (count < 0) { + return count; + } else if (count > 0) { + len += count; + buf[len++] = '\n'; + } + + return len; +} + +/** + * acpi_device_modalias - modalias sysfs attribute for ACPI-enumerated devices. + * @dev: Struct device to get ACPI device node. + * @buf: The buffer to save pnp_modalias and of_modalias. + * @size: Size of buffer. + * + * Create the modalias sysfs attribute for ACPI-enumerated devices. + * + * Because other buses do not support ACPI HIDs & CIDs, e.g. for a device with + * hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001". + */ +int acpi_device_modalias(struct device *dev, char *buf, int size) +{ + return __acpi_device_modalias(acpi_companion_match(dev), buf, size); +} +EXPORT_SYMBOL_GPL(acpi_device_modalias); + +static ssize_t +modalias_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return __acpi_device_modalias(to_acpi_device(dev), buf, 1024); +} +static DEVICE_ATTR_RO(modalias); + +static ssize_t real_power_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct acpi_device *adev = to_acpi_device(dev); + int state; + int ret; + + ret = acpi_device_get_power(adev, &state); + if (ret) + return ret; + + return sysfs_emit(buf, "%s\n", acpi_power_state_string(state)); +} + +static DEVICE_ATTR_RO(real_power_state); + +static ssize_t power_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct acpi_device *adev = to_acpi_device(dev); + + return sysfs_emit(buf, "%s\n", acpi_power_state_string(adev->power.state)); +} + +static DEVICE_ATTR_RO(power_state); + +static ssize_t +eject_store(struct device *d, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct acpi_device *acpi_device = to_acpi_device(d); + acpi_object_type not_used; + acpi_status status; + + if (!count || buf[0] != '1') + return -EINVAL; + + if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) + && !d->driver) + return -ENODEV; + + status = acpi_get_type(acpi_device->handle, ¬_used); + if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) + return -ENODEV; + + acpi_dev_get(acpi_device); + status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT); + if (ACPI_SUCCESS(status)) + return count; + + acpi_dev_put(acpi_device); + acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, + ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); + return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; +} + +static DEVICE_ATTR_WO(eject); + +static ssize_t +hid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + + return sysfs_emit(buf, "%s\n", acpi_device_hid(acpi_dev)); +} +static DEVICE_ATTR_RO(hid); + +static ssize_t cid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_device_info *info = NULL; + ssize_t len = 0; + + acpi_get_object_info(acpi_dev->handle, &info); + if (!info) + return 0; + + if (info->valid & ACPI_VALID_CID) { + struct acpi_pnp_device_id_list *cid_list = &info->compatible_id_list; + int i; + + for (i = 0; i < cid_list->count - 1; i++) + len += sysfs_emit_at(buf, len, "%s,", cid_list->ids[i].string); + + len += sysfs_emit_at(buf, len, "%s\n", cid_list->ids[i].string); + } + + kfree(info); + + return len; +} +static DEVICE_ATTR_RO(cid); + +static ssize_t uid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + + return sysfs_emit(buf, "%s\n", acpi_device_uid(acpi_dev)); +} +static DEVICE_ATTR_RO(uid); + +static ssize_t adr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + + if (acpi_dev->pnp.bus_address > U32_MAX) + return sysfs_emit(buf, "0x%016llx\n", acpi_dev->pnp.bus_address); + else + return sysfs_emit(buf, "0x%08llx\n", acpi_dev->pnp.bus_address); +} +static DEVICE_ATTR_RO(adr); + +static ssize_t path_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + + return acpi_object_path(acpi_dev->handle, buf); +} +static DEVICE_ATTR_RO(path); + +/* sysfs file that shows description text from the ACPI _STR method */ +static ssize_t description_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; + union acpi_object *str_obj; + acpi_status status; + int result; + + status = acpi_evaluate_object_typed(acpi_dev->handle, "_STR", + NULL, &buffer, + ACPI_TYPE_BUFFER); + if (ACPI_FAILURE(status)) + return -EIO; + + str_obj = buffer.pointer; + + /* + * The _STR object contains a Unicode identifier for a device. + * We need to convert to utf-8 so it can be displayed. + */ + result = utf16s_to_utf8s( + (wchar_t *)str_obj->buffer.pointer, + str_obj->buffer.length, + UTF16_LITTLE_ENDIAN, buf, + PAGE_SIZE - 1); + + buf[result++] = '\n'; + + ACPI_FREE(str_obj); + + return result; +} +static DEVICE_ATTR_RO(description); + +static ssize_t +sun_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + acpi_status status; + unsigned long long sun; + + status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun); + if (ACPI_FAILURE(status)) + return -EIO; + + return sysfs_emit(buf, "%llu\n", sun); +} +static DEVICE_ATTR_RO(sun); + +static ssize_t +hrv_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + acpi_status status; + unsigned long long hrv; + + status = acpi_evaluate_integer(acpi_dev->handle, "_HRV", NULL, &hrv); + if (ACPI_FAILURE(status)) + return -EIO; + + return sysfs_emit(buf, "%llu\n", hrv); +} +static DEVICE_ATTR_RO(hrv); + +static ssize_t status_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + acpi_status status; + unsigned long long sta; + + status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); + if (ACPI_FAILURE(status)) + return -EIO; + + return sysfs_emit(buf, "%llu\n", sta); +} +static DEVICE_ATTR_RO(status); + +static struct attribute *acpi_attrs[] = { + &dev_attr_path.attr, + &dev_attr_hid.attr, + &dev_attr_cid.attr, + &dev_attr_modalias.attr, + &dev_attr_description.attr, + &dev_attr_adr.attr, + &dev_attr_uid.attr, + &dev_attr_sun.attr, + &dev_attr_hrv.attr, + &dev_attr_status.attr, + &dev_attr_eject.attr, + &dev_attr_power_state.attr, + &dev_attr_real_power_state.attr, + NULL +}; + +static bool acpi_show_attr(struct acpi_device *dev, const struct device_attribute *attr) +{ + /* + * Devices gotten from FADT don't have a "path" attribute + */ + if (attr == &dev_attr_path) + return dev->handle; + + if (attr == &dev_attr_hid || attr == &dev_attr_modalias) + return !list_empty(&dev->pnp.ids); + + if (attr == &dev_attr_description) + return acpi_has_method(dev->handle, "_STR"); + + if (attr == &dev_attr_adr) + return dev->pnp.type.bus_address; + + if (attr == &dev_attr_uid) + return acpi_device_uid(dev); + + if (attr == &dev_attr_sun) + return acpi_has_method(dev->handle, "_SUN"); + + if (attr == &dev_attr_hrv) + return acpi_has_method(dev->handle, "_HRV"); + + if (attr == &dev_attr_status) + return acpi_has_method(dev->handle, "_STA"); + + if (attr == &dev_attr_cid) + return acpi_has_method(dev->handle, "_CID"); + + /* + * If device has _EJ0, 'eject' file is created that is used to trigger + * hot-removal function from userland. + */ + if (attr == &dev_attr_eject) + return acpi_has_method(dev->handle, "_EJ0"); + + if (attr == &dev_attr_power_state) + return dev->flags.power_manageable; + + if (attr == &dev_attr_real_power_state) + return dev->flags.power_manageable && dev->power.flags.power_resources; + + dev_warn_once(&dev->dev, "Unexpected attribute: %s\n", attr->attr.name); + return false; +} + +static umode_t acpi_attr_is_visible(struct kobject *kobj, + struct attribute *attr, + int attrno) +{ + struct acpi_device *dev = to_acpi_device(kobj_to_dev(kobj)); + + if (acpi_show_attr(dev, container_of(attr, struct device_attribute, attr))) + return attr->mode; + else + return 0; +} + +static const struct attribute_group acpi_group = { + .attrs = acpi_attrs, + .is_visible = acpi_attr_is_visible, +}; + +const struct attribute_group *acpi_groups[] = { + &acpi_group, + NULL +}; + +/** + * acpi_device_setup_files - Create sysfs attributes of an ACPI device. + * @dev: ACPI device object. + */ +void acpi_device_setup_files(struct acpi_device *dev) +{ + acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data); +} + +/** + * acpi_device_remove_files - Remove sysfs attributes of an ACPI device. + * @dev: ACPI device object. + */ +void acpi_device_remove_files(struct acpi_device *dev) +{ + acpi_hide_nondev_subnodes(&dev->data); +} -- cgit v1.3.1