2 * hdac-ext-bus.c - HD-audio extended core bus functions.
4 * Copyright (C) 2014-2015 Intel Corp
5 * Author: Jeeja KP <jeeja.kp@intel.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 #include <linux/module.h>
21 #include <linux/slab.h>
22 #include <sound/hdaudio_ext.h>
24 MODULE_DESCRIPTION("HDA extended core");
25 MODULE_LICENSE("GPL v2");
27 static void hdac_ext_writel(u32 value, u32 __iomem *addr)
32 static u32 hdac_ext_readl(u32 __iomem *addr)
37 static void hdac_ext_writew(u16 value, u16 __iomem *addr)
42 static u16 hdac_ext_readw(u16 __iomem *addr)
47 static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
52 static u8 hdac_ext_readb(u8 __iomem *addr)
57 static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
58 size_t size, struct snd_dma_buffer *buf)
60 return snd_dma_alloc_pages(type, bus->dev, size, buf);
63 static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
65 snd_dma_free_pages(buf);
68 static const struct hdac_io_ops hdac_ext_default_io = {
69 .reg_writel = hdac_ext_writel,
70 .reg_readl = hdac_ext_readl,
71 .reg_writew = hdac_ext_writew,
72 .reg_readw = hdac_ext_readw,
73 .reg_writeb = hdac_ext_writeb,
74 .reg_readb = hdac_ext_readb,
75 .dma_alloc_pages = hdac_ext_dma_alloc_pages,
76 .dma_free_pages = hdac_ext_dma_free_pages,
80 * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
81 * @ebus: the pointer to extended bus object
82 * @dev: device pointer
83 * @ops: bus verb operators
84 * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
87 * Returns 0 if successful, or a negative error code.
89 int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev,
90 const struct hdac_bus_ops *ops,
91 const struct hdac_io_ops *io_ops)
96 /* check if io ops are provided, if not load the defaults */
98 io_ops = &hdac_ext_default_io;
100 ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
104 INIT_LIST_HEAD(&ebus->hlink_list);
109 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
112 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
113 * @ebus: the pointer to extended bus object
115 void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus)
117 snd_hdac_bus_exit(&ebus->bus);
118 WARN_ON(!list_empty(&ebus->hlink_list));
120 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
122 static void default_release(struct device *dev)
124 snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
128 * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device
129 * @ebus: hdac extended bus to attach to
130 * @addr: codec address
132 * Returns zero for success or a negative error code.
134 int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr)
136 struct hdac_ext_device *edev;
137 struct hdac_device *hdev = NULL;
138 struct hdac_bus *bus = ebus_to_hbus(ebus);
142 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
147 snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr);
149 ret = snd_hdac_device_init(hdev, bus, name, addr);
151 dev_err(bus->dev, "device init failed for hdac device\n");
154 hdev->type = HDA_DEV_ASOC;
155 hdev->dev.release = default_release;
157 ret = snd_hdac_device_register(hdev);
159 dev_err(bus->dev, "failed to register hdac device\n");
160 snd_hdac_ext_bus_device_exit(hdev);
166 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
169 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
170 * @hdev: hdac device to clean up
172 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
174 struct hdac_ext_device *edev = to_ehdac_device(hdev);
176 snd_hdac_device_exit(hdev);
179 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
182 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
184 * @ebus: HD-audio extended bus
186 void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus)
188 struct hdac_device *codec, *__codec;
190 * we need to remove all the codec devices objects created in the
191 * snd_hdac_ext_bus_device_init
193 list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) {
194 snd_hdac_device_unregister(codec);
195 put_device(&codec->dev);
198 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
199 #define dev_to_hdac(dev) (container_of((dev), \
200 struct hdac_device, dev))
202 static inline struct hdac_ext_driver *get_edrv(struct device *dev)
204 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
205 struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv);
210 static inline struct hdac_ext_device *get_edev(struct device *dev)
212 struct hdac_device *hdev = dev_to_hdac_dev(dev);
213 struct hdac_ext_device *edev = to_ehdac_device(hdev);
218 static int hda_ext_drv_probe(struct device *dev)
220 return (get_edrv(dev))->probe(get_edev(dev));
223 static int hdac_ext_drv_remove(struct device *dev)
225 return (get_edrv(dev))->remove(get_edev(dev));
228 static void hdac_ext_drv_shutdown(struct device *dev)
230 return (get_edrv(dev))->shutdown(get_edev(dev));
234 * snd_hda_ext_driver_register - register a driver for ext hda devices
236 * @drv: ext hda driver structure
238 int snd_hda_ext_driver_register(struct hdac_ext_driver *drv)
240 drv->hdac.type = HDA_DEV_ASOC;
241 drv->hdac.driver.bus = &snd_hda_bus_type;
242 /* we use default match */
245 drv->hdac.driver.probe = hda_ext_drv_probe;
247 drv->hdac.driver.remove = hdac_ext_drv_remove;
249 drv->hdac.driver.shutdown = hdac_ext_drv_shutdown;
251 return driver_register(&drv->hdac.driver);
253 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
256 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
258 * @drv: ext hda driver structure
260 void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv)
262 driver_unregister(&drv->hdac.driver);
264 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);