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sound/ac97_bus.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Linux driver model AC97 bus interface * * Author: Nicolas Pitre * Created: Jan 14, 2005 * Copyright: (C) MontaVista Software Inc. |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> #include <linux/device.h> #include <linux/string.h> |
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#include <sound/ac97_codec.h> |
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/* |
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* snd_ac97_check_id() - Reads and checks the vendor ID of the device * @ac97: The AC97 device to check * @id: The ID to compare to * @id_mask: Mask that is applied to the device ID before comparing to @id * * If @id is 0 this function returns true if the read device vendor ID is * a valid ID. If @id is non 0 this functions returns true if @id * matches the read vendor ID. Otherwise the function returns false. */ static bool snd_ac97_check_id(struct snd_ac97 *ac97, unsigned int id, unsigned int id_mask) { ac97->id = ac97->bus->ops->read(ac97, AC97_VENDOR_ID1) << 16; ac97->id |= ac97->bus->ops->read(ac97, AC97_VENDOR_ID2); if (ac97->id == 0x0 || ac97->id == 0xffffffff) return false; if (id != 0 && id != (ac97->id & id_mask)) return false; return true; } /** * snd_ac97_reset() - Reset AC'97 device * @ac97: The AC'97 device to reset * @try_warm: Try a warm reset first * @id: Expected device vendor ID * @id_mask: Mask that is applied to the device ID before comparing to @id * * This function resets the AC'97 device. If @try_warm is true the function * first performs a warm reset. If the warm reset is successful the function * returns 1. Otherwise or if @try_warm is false the function issues cold reset * followed by a warm reset. If this is successful the function returns 0, * otherwise a negative error code. If @id is 0 any valid device ID will be * accepted, otherwise only the ID that matches @id and @id_mask is accepted. */ int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id, unsigned int id_mask) { |
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const struct snd_ac97_bus_ops *ops = ac97->bus->ops; |
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if (try_warm && ops->warm_reset) { ops->warm_reset(ac97); if (snd_ac97_check_id(ac97, id, id_mask)) return 1; } if (ops->reset) ops->reset(ac97); if (ops->warm_reset) ops->warm_reset(ac97); if (snd_ac97_check_id(ac97, id, id_mask)) return 0; return -ENODEV; } EXPORT_SYMBOL_GPL(snd_ac97_reset); /* |
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* Let drivers decide whether they want to support given codec from their |
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* probe method. Drivers have direct access to the struct snd_ac97 * structure and may decide based on the id field amongst other things. |
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*/ static int ac97_bus_match(struct device *dev, struct device_driver *drv) { |
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return 1; |
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} |
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struct bus_type ac97_bus_type = { .name = "ac97", .match = ac97_bus_match, |
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}; static int __init ac97_bus_init(void) { return bus_register(&ac97_bus_type); } subsys_initcall(ac97_bus_init); static void __exit ac97_bus_exit(void) { bus_unregister(&ac97_bus_type); } module_exit(ac97_bus_exit); EXPORT_SYMBOL(ac97_bus_type); MODULE_LICENSE("GPL"); |