forked from luck/tmp_suning_uos_patched
08ceab9d87
Not many updates to the core here, but an awful lot of driver updates
this time round:
- Factoring out of AC'97 reset code into the core
- New drivers for Cirrus CS4349, GTM601, InvenSense ICS43432, Realtek
RT298 and ST STI controllers.
- Machine drivers for Rockchip systems with MAX98090 and RT5645 and
RT5650.
- Initial driver support for Intel Skylake devices.
- A large number of cleanups for Lars-Peter Clausen and Axel Lin.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
iQEcBAABAgAGBQJV4xxpAAoJECTWi3JdVIfQjuUH/3xuZSROdiVUit9zWHepebqR
4e9bgu9vN9RfFZ3BqYC/0TIv8PwtwvDFu3xJoCxy52wcXWuz/H4itH9xh21EiL9l
4s14Sfkj8BA332aQMXKMFBtpB5S1feMFhBSATihfXlfLCLby9Gm0GDoLiiDklX47
svysCy9G9CmCSDufZ6TcO58PUJvjrQaI0SY5oAG2JnHW7XmnG6a7s5gJR4bu/FXs
oJfkLbpfIl03JdJ/q1IoTm0UUyRaTx7cWKoOtp8icoza8cfnsUG8uoCAvbYcG3Li
/1JtZrVjZPM+ZpM0+5gl9mhRpj8zJksDgTPT2mlzWfsgJiuo48w9xqlqItvJjG8=
=92/y
-----END PGP SIGNATURE-----
Merge tag 'asoc-v4.2-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Updates for v4.3
Not many updates to the core here, but an awful lot of driver updates
this time round:
- Factoring out of AC'97 reset code into the core
- New drivers for Cirrus CS4349, GTM601, InvenSense ICS43432, Realtek
RT298 and ST STI controllers.
- Machine drivers for Rockchip systems with MAX98090 and RT5645 and
RT5650.
- Initial driver support for Intel Skylake devices.
- A large number of cleanups for Lars-Peter Clausen and Axel Lin.
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/*
|
|
* 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 <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/device.h>
|
|
#include <linux/string.h>
|
|
#include <sound/ac97_codec.h>
|
|
|
|
/*
|
|
* 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");
|