/* * Linux driver model AC97 bus interface * * Author: Nicolas Pitre * Created: Jan 14, 2005 * Copyright: (C) MontaVista Software Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include #include #include /* * 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) { struct snd_ac97_bus_ops *ops = ac97->bus->ops; 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); /* * Let drivers decide whether they want to support given codec from their * probe method. Drivers have direct access to the struct snd_ac97 * structure and may decide based on the id field amongst other things. */ static int ac97_bus_match(struct device *dev, struct device_driver *drv) { return 1; } struct bus_type ac97_bus_type = { .name = "ac97", .match = ac97_bus_match, }; 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"); 8384553dddcf5b81b22'>Kconfig
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authorStanislaw Gruszka <sgruszka@redhat.com>2017-01-29 12:40:52 +0100
committerKalle Valo <kvalo@codeaurora.org>2017-01-31 09:08:52 +0200
commit33e962c8871f015f5c8978384553dddcf5b81b22 (patch)
tree43aff96c2ee21d9e0fa2018457778a4de52053cd /net/nfc/nci/Kconfig
parent575ddce0507789bf9830d089557d2199d2f91865 (diff)
rt2x00: fix clk_get call
clk_get() takes two arguments and might return ERR_PTR(), so we have to nullify pointer on that case, to do not break further call to clk_get_rate(). Reported-by: Felix Fietkau <nbd@nbd.name> Fixes: 34db70b92fae ("rt2x00: add copy of clk for soc devices") Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'net/nfc/nci/Kconfig')