/* * hdac-ext-bus.c - HD-audio extended core bus functions. * * Copyright (C) 2014-2015 Intel Corp * Author: Jeeja KP * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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; version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include MODULE_DESCRIPTION("HDA extended core"); MODULE_LICENSE("GPL v2"); static void hdac_ext_writel(u32 value, u32 __iomem *addr) { writel(value, addr); } static u32 hdac_ext_readl(u32 __iomem *addr) { return readl(addr); } static void hdac_ext_writew(u16 value, u16 __iomem *addr) { writew(value, addr); } static u16 hdac_ext_readw(u16 __iomem *addr) { return readw(addr); } static void hdac_ext_writeb(u8 value, u8 __iomem *addr) { writeb(value, addr); } static u8 hdac_ext_readb(u8 __iomem *addr) { return readb(addr); } static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type, size_t size, struct snd_dma_buffer *buf) { return snd_dma_alloc_pages(type, bus->dev, size, buf); } static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf) { snd_dma_free_pages(buf); } static const struct hdac_io_ops hdac_ext_default_io = { .reg_writel = hdac_ext_writel, .reg_readl = hdac_ext_readl, .reg_writew = hdac_ext_writew, .reg_readw = hdac_ext_readw, .reg_writeb = hdac_ext_writeb, .reg_readb = hdac_ext_readb, .dma_alloc_pages = hdac_ext_dma_alloc_pages, .dma_free_pages = hdac_ext_dma_free_pages, }; /** * snd_hdac_ext_bus_init - initialize a HD-audio extended bus * @ebus: the pointer to extended bus object * @dev: device pointer * @ops: bus verb operators * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use * default ops * * Returns 0 if successful, or a negative error code. */ int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev, const struct hdac_bus_ops *ops, const struct hdac_io_ops *io_ops) { int ret; static int idx; /* check if io ops are provided, if not load the defaults */ if (io_ops == NULL) io_ops = &hdac_ext_default_io; ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops); if (ret < 0) return ret; INIT_LIST_HEAD(&ebus->hlink_list); ebus->idx = idx++; return 0; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init); /** * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus * @ebus: the pointer to extended bus object */ void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus) { snd_hdac_bus_exit(&ebus->bus); WARN_ON(!list_empty(&ebus->hlink_list)); } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit); static void default_release(struct device *dev) { snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev)); } /** * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device * @ebus: hdac extended bus to attach to * @addr: codec address * * Returns zero for success or a negative error code. */ int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr) { struct hdac_ext_device *edev; struct hdac_device *hdev = NULL; struct hdac_bus *bus = ebus_to_hbus(ebus); char name[15]; int ret; edev = kzalloc(sizeof(*edev), GFP_KERNEL); if (!edev) return -ENOMEM; hdev = &edev->hdac; snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr); ret = snd_hdac_device_init(hdev, bus, name, addr); if (ret < 0) { dev_err(bus->dev, "device init failed for hdac device\n"); return ret; } hdev->type = HDA_DEV_ASOC; hdev->dev.release = default_release; ret = snd_hdac_device_register(hdev); if (ret) { dev_err(bus->dev, "failed to register hdac device\n"); snd_hdac_ext_bus_device_exit(hdev); return ret; } return 0; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); /** * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device * @hdev: hdac device to clean up */ void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) { struct hdac_ext_device *edev = to_ehdac_device(hdev); snd_hdac_device_exit(hdev); kfree(edev); } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); /** * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices * * @ebus: HD-audio extended bus */ void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus) { struct hdac_device *codec, *__codec; /* * we need to remove all the codec devices objects created in the * snd_hdac_ext_bus_device_init */ list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) { snd_hdac_device_unregister(codec); put_device(&codec->dev); } } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); #define dev_to_hdac(dev) (container_of((dev), \ struct hdac_device, dev)) static inline struct hdac_ext_driver *get_edrv(struct device *dev) { struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv); return edrv; } static inline struct hdac_ext_device *get_edev(struct device *dev) { struct hdac_device *hdev = dev_to_hdac_dev(dev); struct hdac_ext_device *edev = to_ehdac_device(hdev); return edev; } static int hda_ext_drv_probe(struct device *dev) { return (get_edrv(dev))->probe(get_edev(dev)); } static int hdac_ext_drv_remove(struct device *dev) { return (get_edrv(dev))->remove(get_edev(dev)); } static void hdac_ext_drv_shutdown(struct device *dev) { return (get_edrv(dev))->shutdown(get_edev(dev)); } /** * snd_hda_ext_driver_register - register a driver for ext hda devices * * @drv: ext hda driver structure */ int snd_hda_ext_driver_register(struct hdac_ext_driver *drv) { drv->hdac.type = HDA_DEV_ASOC; drv->hdac.driver.bus = &snd_hda_bus_type; /* we use default match */ if (drv->probe) drv->hdac.driver.probe = hda_ext_drv_probe; if (drv->remove) drv->hdac.driver.remove = hdac_ext_drv_remove; if (drv->shutdown) drv->hdac.driver.shutdown = hdac_ext_drv_shutdown; return driver_register(&drv->hdac.driver); } EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); /** * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices * * @drv: ext hda driver structure */ void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv) { driver_unregister(&drv->hdac.driver); } EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);