diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/Makefile | 1 | ||||
| -rw-r--r-- | drivers/base/auxiliary.c | 1 | ||||
| -rw-r--r-- | drivers/base/auxiliary_sysfs.c | 113 |
3 files changed, 115 insertions, 0 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 3079bfe53d04..7fb21768ca36 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_NUMA) += node.o obj-$(CONFIG_MEMORY_HOTPLUG) += memory.o ifeq ($(CONFIG_SYSFS),y) obj-$(CONFIG_MODULES) += module.o +obj-$(CONFIG_AUXILIARY_BUS) += auxiliary_sysfs.o endif obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o obj-$(CONFIG_REGMAP) += regmap/ diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c index d3a2c40c2f12..3f01f4ec69e5 100644 --- a/drivers/base/auxiliary.c +++ b/drivers/base/auxiliary.c @@ -287,6 +287,7 @@ int auxiliary_device_init(struct auxiliary_device *auxdev) dev->bus = &auxiliary_bus_type; device_initialize(&auxdev->dev); + mutex_init(&auxdev->sysfs.lock); return 0; } EXPORT_SYMBOL_GPL(auxiliary_device_init); diff --git a/drivers/base/auxiliary_sysfs.c b/drivers/base/auxiliary_sysfs.c new file mode 100644 index 000000000000..754f21730afd --- /dev/null +++ b/drivers/base/auxiliary_sysfs.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES + */ + +#include <linux/auxiliary_bus.h> +#include <linux/slab.h> + +#define AUXILIARY_MAX_IRQ_NAME 11 + +struct auxiliary_irq_info { + struct device_attribute sysfs_attr; + char name[AUXILIARY_MAX_IRQ_NAME]; +}; + +static struct attribute *auxiliary_irq_attrs[] = { + NULL +}; + +static const struct attribute_group auxiliary_irqs_group = { + .name = "irqs", + .attrs = auxiliary_irq_attrs, +}; + +static int auxiliary_irq_dir_prepare(struct auxiliary_device *auxdev) +{ + int ret = 0; + + guard(mutex)(&auxdev->sysfs.lock); + if (auxdev->sysfs.irq_dir_exists) + return 0; + + ret = devm_device_add_group(&auxdev->dev, &auxiliary_irqs_group); + if (ret) + return ret; + + auxdev->sysfs.irq_dir_exists = true; + xa_init(&auxdev->sysfs.irqs); + return 0; +} + +/** + * auxiliary_device_sysfs_irq_add - add a sysfs entry for the given IRQ + * @auxdev: auxiliary bus device to add the sysfs entry. + * @irq: The associated interrupt number. + * + * This function should be called after auxiliary device have successfully + * received the irq. + * The driver is responsible to add a unique irq for the auxiliary device. The + * driver can invoke this function from multiple thread context safely for + * unique irqs of the auxiliary devices. The driver must not invoke this API + * multiple times if the irq is already added previously. + * + * Return: zero on success or an error code on failure. + */ +int auxiliary_device_sysfs_irq_add(struct auxiliary_device *auxdev, int irq) +{ + struct auxiliary_irq_info *info __free(kfree) = NULL; + struct device *dev = &auxdev->dev; + int ret; + + ret = auxiliary_irq_dir_prepare(auxdev); + if (ret) + return ret; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + sysfs_attr_init(&info->sysfs_attr.attr); + snprintf(info->name, AUXILIARY_MAX_IRQ_NAME, "%d", irq); + + ret = xa_insert(&auxdev->sysfs.irqs, irq, info, GFP_KERNEL); + if (ret) + return ret; + + info->sysfs_attr.attr.name = info->name; + ret = sysfs_add_file_to_group(&dev->kobj, &info->sysfs_attr.attr, + auxiliary_irqs_group.name); + if (ret) + goto sysfs_add_err; + + xa_store(&auxdev->sysfs.irqs, irq, no_free_ptr(info), GFP_KERNEL); + return 0; + +sysfs_add_err: + xa_erase(&auxdev->sysfs.irqs, irq); + return ret; +} +EXPORT_SYMBOL_GPL(auxiliary_device_sysfs_irq_add); + +/** + * auxiliary_device_sysfs_irq_remove - remove a sysfs entry for the given IRQ + * @auxdev: auxiliary bus device to add the sysfs entry. + * @irq: the IRQ to remove. + * + * This function should be called to remove an IRQ sysfs entry. + * The driver must invoke this API when IRQ is released by the device. + */ +void auxiliary_device_sysfs_irq_remove(struct auxiliary_device *auxdev, int irq) +{ + struct auxiliary_irq_info *info __free(kfree) = xa_load(&auxdev->sysfs.irqs, irq); + struct device *dev = &auxdev->dev; + + if (!info) { + dev_err(&auxdev->dev, "IRQ %d doesn't exist\n", irq); + return; + } + sysfs_remove_file_from_group(&dev->kobj, &info->sysfs_attr.attr, + auxiliary_irqs_group.name); + xa_erase(&auxdev->sysfs.irqs, irq); +} +EXPORT_SYMBOL_GPL(auxiliary_device_sysfs_irq_remove); |