From: Liam Girdwood Date: Fri, 29 Jul 2005 14:13:36 +0000 (+0200) Subject: [ALSA] AC97 bus interface for ad-hoc drivers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0ca06a00e206b963587ac471e6d1c52bf33b9a18;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [ALSA] AC97 bus interface for ad-hoc drivers AC97 Codec,PCI drivers I've made the review changes and as requested I've pasted the RFC by Nicolas below:- 'I would like to know what people think of the following patch. It allows for a codec on an AC97 bus to be shared with other drivers which are completely unrelated to audio. It registers a new bus type, and whenever a codec instance is created then a device for it is also registered with the driver model using that bus type. This allows, for example, to use the extra features of the UCB1400 like the touchscreen interface and the additional GPIOs and ADCs available on that chip for battery monitoring. I have a working UCB1400 touchscreen driver here that simply registers with the driver model happily working alongside with audio features using this.' Changes over RFC:- o Now matches codec name within codec group. o Added ac97_dev_release() to stop kernel complaining about no release method for device. o Added 'config SND_AC97_BUS' to sound/pci/Kconfig and moved 'config SND_AC97_CODEC' out with the PCI=n statement. o module is now called snd-ac97-bus Signed-off-by: Liam Girdwood Signed-off-by: Nicolas Pitre Signed-off-by: Takashi Iwai --- diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h index cbe72e06c46..2857cf0472d 100644 --- a/include/sound/ac97_codec.h +++ b/include/sound/ac97_codec.h @@ -26,6 +26,7 @@ */ #include +#include #include "pcm.h" #include "control.h" #include "info.h" @@ -523,6 +524,7 @@ struct _snd_ac97 { /* jack-sharing info */ unsigned char indep_surround; unsigned char channel_mode; + struct device dev; }; /* conditions */ @@ -602,4 +604,8 @@ struct ac97_enum { unsigned short mask; const char **texts; }; + +/* ad hoc AC97 device driver access */ +extern struct bus_type ac97_bus_type; + #endif /* __SOUND_AC97_CODEC_H */ diff --git a/sound/pci/Kconfig b/sound/pci/Kconfig index 26b42bb20a0..1e458919cce 100644 --- a/sound/pci/Kconfig +++ b/sound/pci/Kconfig @@ -1,11 +1,15 @@ # ALSA PCI drivers -menu "PCI devices" - depends on SND!=n && PCI - config SND_AC97_CODEC tristate select SND_PCM + select SND_AC97_BUS + +config SND_AC97_BUS + tristate + +menu "PCI devices" + depends on SND!=n && PCI config SND_ALI5451 tristate "ALi M5451 PCI Audio Controller" diff --git a/sound/pci/ac97/Makefile b/sound/pci/ac97/Makefile index 3c3222122d8..77b3482cb13 100644 --- a/sound/pci/ac97/Makefile +++ b/sound/pci/ac97/Makefile @@ -10,9 +10,11 @@ snd-ac97-codec-objs += ac97_proc.o endif snd-ak4531-codec-objs := ak4531_codec.o +snd-ac97-bus-objs := ac97_bus.o # Toplevel Module Dependency obj-$(CONFIG_SND_AC97_CODEC) += snd-ac97-codec.o obj-$(CONFIG_SND_ENS1370) += snd-ak4531-codec.o +obj-$(CONFIG_SND_AC97_BUS) += snd-ac97-bus.o obj-m := $(sort $(obj-m)) diff --git a/sound/pci/ac97/ac97_bus.c b/sound/pci/ac97/ac97_bus.c new file mode 100644 index 00000000000..227f8b9f67c --- /dev/null +++ b/sound/pci/ac97/ac97_bus.c @@ -0,0 +1,79 @@ +/* + * 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 + +/* + * Codec families have names seperated by commas, so we search for an + * individual codec name within the family string. + */ +static int ac97_bus_match(struct device *dev, struct device_driver *drv) +{ + return (strstr(dev->bus_id, drv->name) != NULL); +} + +static int ac97_bus_suspend(struct device *dev, pm_message_t state) +{ + int ret = 0; + + if (dev->driver && dev->driver->suspend) { + ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE); + if (ret == 0) + ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE); + if (ret == 0) + ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN); + } + return ret; +} + +static int ac97_bus_resume(struct device *dev) +{ + int ret = 0; + + if (dev->driver && dev->driver->resume) { + ret = dev->driver->resume(dev, RESUME_POWER_ON); + if (ret == 0) + ret = dev->driver->resume(dev, RESUME_RESTORE_STATE); + if (ret == 0) + ret = dev->driver->resume(dev, RESUME_ENABLE); + } + return ret; +} + +struct bus_type ac97_bus_type = { + .name = "ac97", + .match = ac97_bus_match, + .suspend = ac97_bus_suspend, + .resume = ac97_bus_resume, +}; + +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"); diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c index cbf790270c3..33dba10f03e 100644 --- a/sound/pci/ac97/ac97_codec.c +++ b/sound/pci/ac97/ac97_codec.c @@ -1813,6 +1813,39 @@ int snd_ac97_bus(snd_card_t *card, int num, ac97_bus_ops_t *ops, return 0; } +/* stop no dev release warning */ +static void ac97_device_release(struct device * dev) +{ +} + +/* register ac97 codec to bus */ +static int snd_ac97_dev_register(snd_device_t *device) +{ + ac97_t *ac97 = device->device_data; + int err; + + ac97->dev.bus = &ac97_bus_type; + ac97->dev.parent = ac97->bus->card->dev; + ac97->dev.platform_data = ac97; + ac97->dev.release = ac97_device_release; + strncpy(ac97->dev.bus_id, snd_ac97_get_short_name(ac97), BUS_ID_SIZE); + if ((err = device_register(&ac97->dev)) < 0) { + snd_printk(KERN_ERR "Can't register ac97 bus\n"); + ac97->dev.bus = NULL; + return err; + } + return 0; +} + +/* unregister ac97 codec */ +static int snd_ac97_dev_unregister(snd_device_t *device) +{ + ac97_t *ac97 = device->device_data; + if (ac97->dev.bus) + device_unregister(&ac97->dev); + return snd_ac97_free(ac97); +} + /* build_ops to do nothing */ static struct snd_ac97_build_ops null_build_ops; @@ -1846,6 +1879,8 @@ int snd_ac97_mixer(ac97_bus_t *bus, ac97_template_t *template, ac97_t **rac97) const ac97_codec_id_t *pid; static snd_device_ops_t ops = { .dev_free = snd_ac97_dev_free, + .dev_register = snd_ac97_dev_register, + .dev_unregister = snd_ac97_dev_unregister, }; snd_assert(rac97 != NULL, return -EINVAL);