1 /* 2 * hdac-ext-bus.c - HD-audio extended core bus functions. 3 * 4 * Copyright (C) 2014-2015 Intel Corp 5 * Author: Jeeja KP <jeeja.kp@intel.com> 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 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. 11 * 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. 16 * 17 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 18 */ 19 20 #include <linux/module.h> 21 #include <linux/slab.h> 22 #include <linux/io.h> 23 #include <sound/hdaudio_ext.h> 24 25 MODULE_DESCRIPTION("HDA extended core"); 26 MODULE_LICENSE("GPL v2"); 27 28 static void hdac_ext_writel(u32 value, u32 __iomem *addr) 29 { 30 writel(value, addr); 31 } 32 33 static u32 hdac_ext_readl(u32 __iomem *addr) 34 { 35 return readl(addr); 36 } 37 38 static void hdac_ext_writew(u16 value, u16 __iomem *addr) 39 { 40 writew(value, addr); 41 } 42 43 static u16 hdac_ext_readw(u16 __iomem *addr) 44 { 45 return readw(addr); 46 } 47 48 static void hdac_ext_writeb(u8 value, u8 __iomem *addr) 49 { 50 writeb(value, addr); 51 } 52 53 static u8 hdac_ext_readb(u8 __iomem *addr) 54 { 55 return readb(addr); 56 } 57 58 static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type, 59 size_t size, struct snd_dma_buffer *buf) 60 { 61 return snd_dma_alloc_pages(type, bus->dev, size, buf); 62 } 63 64 static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf) 65 { 66 snd_dma_free_pages(buf); 67 } 68 69 static const struct hdac_io_ops hdac_ext_default_io = { 70 .reg_writel = hdac_ext_writel, 71 .reg_readl = hdac_ext_readl, 72 .reg_writew = hdac_ext_writew, 73 .reg_readw = hdac_ext_readw, 74 .reg_writeb = hdac_ext_writeb, 75 .reg_readb = hdac_ext_readb, 76 .dma_alloc_pages = hdac_ext_dma_alloc_pages, 77 .dma_free_pages = hdac_ext_dma_free_pages, 78 }; 79 80 /** 81 * snd_hdac_ext_bus_init - initialize a HD-audio extended bus 82 * @ebus: the pointer to extended bus object 83 * @dev: device pointer 84 * @ops: bus verb operators 85 * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use 86 * default ops 87 * 88 * Returns 0 if successful, or a negative error code. 89 */ 90 int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev, 91 const struct hdac_bus_ops *ops, 92 const struct hdac_io_ops *io_ops, 93 const struct hdac_ext_bus_ops *ext_ops) 94 { 95 int ret; 96 static int idx; 97 98 /* check if io ops are provided, if not load the defaults */ 99 if (io_ops == NULL) 100 io_ops = &hdac_ext_default_io; 101 102 ret = snd_hdac_bus_init(bus, dev, ops, io_ops); 103 if (ret < 0) 104 return ret; 105 106 bus->ext_ops = ext_ops; 107 INIT_LIST_HEAD(&bus->hlink_list); 108 bus->idx = idx++; 109 110 mutex_init(&bus->lock); 111 bus->cmd_dma_state = true; 112 113 return 0; 114 } 115 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init); 116 117 /** 118 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus 119 * @ebus: the pointer to extended bus object 120 */ 121 void snd_hdac_ext_bus_exit(struct hdac_bus *bus) 122 { 123 snd_hdac_bus_exit(bus); 124 WARN_ON(!list_empty(&bus->hlink_list)); 125 } 126 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit); 127 128 static void default_release(struct device *dev) 129 { 130 snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev)); 131 } 132 133 /** 134 * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device 135 * @ebus: hdac extended bus to attach to 136 * @addr: codec address 137 * 138 * Returns zero for success or a negative error code. 139 */ 140 int snd_hdac_ext_bus_device_init(struct hdac_bus *bus, int addr, 141 struct hdac_device *hdev) 142 { 143 char name[15]; 144 int ret; 145 146 hdev->bus = bus; 147 148 snprintf(name, sizeof(name), "ehdaudio%dD%d", bus->idx, addr); 149 150 ret = snd_hdac_device_init(hdev, bus, name, addr); 151 if (ret < 0) { 152 dev_err(bus->dev, "device init failed for hdac device\n"); 153 return ret; 154 } 155 hdev->type = HDA_DEV_ASOC; 156 hdev->dev.release = default_release; 157 158 ret = snd_hdac_device_register(hdev); 159 if (ret) { 160 dev_err(bus->dev, "failed to register hdac device\n"); 161 snd_hdac_ext_bus_device_exit(hdev); 162 return ret; 163 } 164 165 return 0; 166 } 167 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); 168 169 /** 170 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device 171 * @hdev: hdac device to clean up 172 */ 173 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) 174 { 175 snd_hdac_device_exit(hdev); 176 kfree(hdev); 177 } 178 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 179 180 /** 181 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices 182 * 183 * @ebus: HD-audio extended bus 184 */ 185 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus) 186 { 187 struct hdac_device *codec, *__codec; 188 /* 189 * we need to remove all the codec devices objects created in the 190 * snd_hdac_ext_bus_device_init 191 */ 192 list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) { 193 snd_hdac_device_unregister(codec); 194 put_device(&codec->dev); 195 } 196 } 197 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 198 #define dev_to_hdac(dev) (container_of((dev), \ 199 struct hdac_device, dev)) 200 201 static inline struct hdac_driver *get_hdrv(struct device *dev) 202 { 203 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); 204 return hdrv; 205 } 206 207 static inline struct hdac_device *get_hdev(struct device *dev) 208 { 209 struct hdac_device *hdev = dev_to_hdac_dev(dev); 210 return hdev; 211 } 212 213 static int hda_ext_drv_probe(struct device *dev) 214 { 215 return (get_hdrv(dev))->probe(get_hdev(dev)); 216 } 217 218 static int hdac_ext_drv_remove(struct device *dev) 219 { 220 return (get_hdrv(dev))->remove(get_hdev(dev)); 221 } 222 223 static void hdac_ext_drv_shutdown(struct device *dev) 224 { 225 return (get_hdrv(dev))->shutdown(get_hdev(dev)); 226 } 227 228 /** 229 * snd_hda_ext_driver_register - register a driver for ext hda devices 230 * 231 * @drv: ext hda driver structure 232 */ 233 int snd_hda_ext_driver_register(struct hdac_driver *drv) 234 { 235 drv->type = HDA_DEV_ASOC; 236 drv->driver.bus = &snd_hda_bus_type; 237 /* we use default match */ 238 239 if (drv->probe) 240 drv->driver.probe = hda_ext_drv_probe; 241 if (drv->remove) 242 drv->driver.remove = hdac_ext_drv_remove; 243 if (drv->shutdown) 244 drv->driver.shutdown = hdac_ext_drv_shutdown; 245 246 return driver_register(&drv->driver); 247 } 248 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); 249 250 /** 251 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices 252 * 253 * @drv: ext hda driver structure 254 */ 255 void snd_hda_ext_driver_unregister(struct hdac_driver *drv) 256 { 257 driver_unregister(&drv->driver); 258 } 259 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 260