diff options
Diffstat (limited to 'sound/hda/ext/hdac_ext_bus.c')
| -rw-r--r-- | sound/hda/ext/hdac_ext_bus.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c new file mode 100644 index 000000000000..0aa5d9eb6c3f --- /dev/null +++ b/sound/hda/ext/hdac_ext_bus.c @@ -0,0 +1,174 @@ +/* + * hdac-ext-bus.c - HD-audio extended core bus functions. + * + * Copyright (C) 2014-2015 Intel Corp + * Author: Jeeja KP <jeeja.kp@intel.com> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * 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 <linux/module.h> +#include <linux/slab.h> +#include <sound/hdaudio_ext.h> + +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_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_device *hdev = NULL; + struct hdac_bus *bus = ebus_to_hbus(ebus); + char name[15]; + int ret; + + hdev = kzalloc(sizeof(*hdev), GFP_KERNEL); + if (!hdev) + return -ENOMEM; + + 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) +{ + snd_hdac_device_exit(hdev); + kfree(hdev); +} +EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); |