1 // SPDX-License-Identifier: GPL-2.0-or-later
12 #include <linux/device.h>
17  * snd_ac97_check_id() - Reads and checks the vendor ID of the device
18  * @ac97: The AC97 device to check
19  * @id: The ID to compare to
20  * @id_mask: Mask that is applied to the device ID before comparing to @id
22  * If @id is 0 this function returns true if the read device vendor ID is
23  * a valid ID. If @id is non 0 this functions returns true if @id
24  * matches the read vendor ID. Otherwise the function returns false.
26 static bool snd_ac97_check_id(struct snd_ac97 *ac97, unsigned int id,  in snd_ac97_check_id()  argument
29 	ac97->id = ac97->bus->ops->read(ac97, AC97_VENDOR_ID1) << 16;  in snd_ac97_check_id()
30 	ac97->id |= ac97->bus->ops->read(ac97, AC97_VENDOR_ID2);  in snd_ac97_check_id()
32 	if (ac97->id == 0x0 || ac97->id == 0xffffffff)  in snd_ac97_check_id()
35 	if (id != 0 && id != (ac97->id & id_mask))  in snd_ac97_check_id()
42  * snd_ac97_reset() - Reset AC'97 device
43  * @ac97: The AC'97 device to reset
45  * @id: Expected device vendor ID
46  * @id_mask: Mask that is applied to the device ID before comparing to @id
48  * This function resets the AC'97 device. If @try_warm is true the function
52  * otherwise a negative error code. If @id is 0 any valid device ID will be
53  * accepted, otherwise only the ID that matches @id and @id_mask is accepted.
55 int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,  in snd_ac97_reset()  argument
58 	const struct snd_ac97_bus_ops *ops = ac97->bus->ops;  in snd_ac97_reset()
60 	if (try_warm && ops->warm_reset) {  in snd_ac97_reset()
61 		ops->warm_reset(ac97);  in snd_ac97_reset()
62 		if (snd_ac97_check_id(ac97, id, id_mask))  in snd_ac97_reset()
66 	if (ops->reset)  in snd_ac97_reset()
67 		ops->reset(ac97);  in snd_ac97_reset()
68 	if (ops->warm_reset)  in snd_ac97_reset()
69 		ops->warm_reset(ac97);  in snd_ac97_reset()
71 	if (snd_ac97_check_id(ac97, id, id_mask))  in snd_ac97_reset()
74 	return -ENODEV;  in snd_ac97_reset()
81  * structure and may  decide based on the id field amongst other things.
83 static int ac97_bus_match(struct device *dev, struct device_driver *drv)  in ac97_bus_match()