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https://github.com/torvalds/linux
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66e82d2199
Now that the driver core can properly handle constant struct bus_type, move all of the sound subsystem struct bus_type structures as const, placing them into read-only memory which can not be modified at runtime. Note, this fixes a duplicate definition of ac97_bus_type, which somehow was declared extern in a .h file, and then static as a prototype in a .c file, and then properly later on in the same .c file. Amazing that no compiler warning ever showed up for this. Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Cc: Dawei Li <set_pte_at@outlook.com> Cc: Yu Liao <liaoyu15@huawei.com> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Hans de Goede <hdegoede@redhat.com> Cc: linux-sound@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/2023121945-immersion-budget-d0aa@gregkh Signed-off-by: Takashi Iwai <tiwai@suse.de>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* HD-audio bus
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*/
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/export.h>
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#include <sound/hdaudio.h>
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MODULE_DESCRIPTION("HD-audio bus");
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MODULE_LICENSE("GPL");
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/**
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* hdac_get_device_id - gets the hdac device id entry
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* @hdev: HD-audio core device
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* @drv: HD-audio codec driver
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*
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* Compares the hdac device vendor_id and revision_id to the hdac_device
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* driver id_table and returns the matching device id entry.
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*/
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const struct hda_device_id *
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hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv)
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{
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if (drv->id_table) {
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const struct hda_device_id *id = drv->id_table;
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while (id->vendor_id) {
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if (hdev->vendor_id == id->vendor_id &&
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(!id->rev_id || id->rev_id == hdev->revision_id))
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return id;
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id++;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(hdac_get_device_id);
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static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
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{
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if (hdac_get_device_id(dev, drv))
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return 1;
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else
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return 0;
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}
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static int hda_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct hdac_device *hdev = dev_to_hdac_dev(dev);
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struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
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if (hdev->type != hdrv->type)
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return 0;
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/*
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* if driver provided a match function use that otherwise we will
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* use hdac_codec_match function
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*/
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if (hdrv->match)
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return hdrv->match(hdev, hdrv);
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else
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return hdac_codec_match(hdev, hdrv);
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return 1;
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}
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static int hda_uevent(const struct device *dev, struct kobj_uevent_env *env)
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{
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char modalias[32];
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snd_hdac_codec_modalias(dev_to_hdac_dev(dev), modalias,
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sizeof(modalias));
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if (add_uevent_var(env, "MODALIAS=%s", modalias))
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return -ENOMEM;
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return 0;
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}
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const struct bus_type snd_hda_bus_type = {
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.name = "hdaudio",
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.match = hda_bus_match,
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.uevent = hda_uevent,
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};
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EXPORT_SYMBOL_GPL(snd_hda_bus_type);
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static int __init hda_bus_init(void)
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{
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return bus_register(&snd_hda_bus_type);
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}
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static void __exit hda_bus_exit(void)
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{
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bus_unregister(&snd_hda_bus_type);
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}
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subsys_initcall(hda_bus_init);
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module_exit(hda_bus_exit);
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