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 <sound/hdaudio_ext.h> 23 24 MODULE_DESCRIPTION("HDA extended core"); 25 MODULE_LICENSE("GPL v2"); 26 27 static void hdac_ext_writel(u32 value, u32 __iomem *addr) 28 { 29 writel(value, addr); 30 } 31 32 static u32 hdac_ext_readl(u32 __iomem *addr) 33 { 34 return readl(addr); 35 } 36 37 static void hdac_ext_writew(u16 value, u16 __iomem *addr) 38 { 39 writew(value, addr); 40 } 41 42 static u16 hdac_ext_readw(u16 __iomem *addr) 43 { 44 return readw(addr); 45 } 46 47 static void hdac_ext_writeb(u8 value, u8 __iomem *addr) 48 { 49 writeb(value, addr); 50 } 51 52 static u8 hdac_ext_readb(u8 __iomem *addr) 53 { 54 return readb(addr); 55 } 56 57 static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type, 58 size_t size, struct snd_dma_buffer *buf) 59 { 60 return snd_dma_alloc_pages(type, bus->dev, size, buf); 61 } 62 63 static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf) 64 { 65 snd_dma_free_pages(buf); 66 } 67 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, 77 }; 78 79 /** 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 85 * default ops 86 * 87 * Returns 0 if successful, or a negative error code. 88 */ 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) 92 { 93 int ret; 94 static int idx; 95 96 /* check if io ops are provided, if not load the defaults */ 97 if (io_ops == NULL) 98 io_ops = &hdac_ext_default_io; 99 100 ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops); 101 if (ret < 0) 102 return ret; 103 104 INIT_LIST_HEAD(&ebus->hlink_list); 105 ebus->idx = idx++; 106 107 return 0; 108 } 109 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init); 110 111 /** 112 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus 113 * @ebus: the pointer to extended bus object 114 */ 115 void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus) 116 { 117 snd_hdac_bus_exit(&ebus->bus); 118 WARN_ON(!list_empty(&ebus->hlink_list)); 119 } 120 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit); 121 122 static void default_release(struct device *dev) 123 { 124 snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev)); 125 } 126 127 /** 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 131 * 132 * Returns zero for success or a negative error code. 133 */ 134 int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr) 135 { 136 struct hdac_ext_device *edev; 137 struct hdac_device *hdev = NULL; 138 struct hdac_bus *bus = ebus_to_hbus(ebus); 139 char name[15]; 140 int ret; 141 142 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 143 if (!edev) 144 return -ENOMEM; 145 hdev = &edev->hdac; 146 147 snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr); 148 149 ret = snd_hdac_device_init(hdev, bus, name, addr); 150 if (ret < 0) { 151 dev_err(bus->dev, "device init failed for hdac device\n"); 152 return ret; 153 } 154 hdev->type = HDA_DEV_ASOC; 155 hdev->dev.release = default_release; 156 157 ret = snd_hdac_device_register(hdev); 158 if (ret) { 159 dev_err(bus->dev, "failed to register hdac device\n"); 160 snd_hdac_ext_bus_device_exit(hdev); 161 return ret; 162 } 163 164 return 0; 165 } 166 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); 167 168 /** 169 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device 170 * @hdev: hdac device to clean up 171 */ 172 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) 173 { 174 struct hdac_ext_device *edev = to_ehdac_device(hdev); 175 176 snd_hdac_device_exit(hdev); 177 kfree(edev); 178 } 179 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 180 181 /** 182 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices 183 * 184 * @ebus: HD-audio extended bus 185 */ 186 void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus) 187 { 188 struct hdac_device *codec, *__codec; 189 /* 190 * we need to remove all the codec devices objects created in the 191 * snd_hdac_ext_bus_device_init 192 */ 193 list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) { 194 snd_hdac_device_unregister(codec); 195 put_device(&codec->dev); 196 } 197 } 198 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 199 #define dev_to_hdac(dev) (container_of((dev), \ 200 struct hdac_device, dev)) 201 202 static inline struct hdac_ext_driver *get_edrv(struct device *dev) 203 { 204 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); 205 struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv); 206 207 return edrv; 208 } 209 210 static inline struct hdac_ext_device *get_edev(struct device *dev) 211 { 212 struct hdac_device *hdev = dev_to_hdac_dev(dev); 213 struct hdac_ext_device *edev = to_ehdac_device(hdev); 214 215 return edev; 216 } 217 218 static int hda_ext_drv_probe(struct device *dev) 219 { 220 return (get_edrv(dev))->probe(get_edev(dev)); 221 } 222 223 static int hdac_ext_drv_remove(struct device *dev) 224 { 225 return (get_edrv(dev))->remove(get_edev(dev)); 226 } 227 228 static void hdac_ext_drv_shutdown(struct device *dev) 229 { 230 return (get_edrv(dev))->shutdown(get_edev(dev)); 231 } 232 233 /** 234 * snd_hda_ext_driver_register - register a driver for ext hda devices 235 * 236 * @drv: ext hda driver structure 237 */ 238 int snd_hda_ext_driver_register(struct hdac_ext_driver *drv) 239 { 240 drv->hdac.type = HDA_DEV_ASOC; 241 drv->hdac.driver.bus = &snd_hda_bus_type; 242 /* we use default match */ 243 244 if (drv->probe) 245 drv->hdac.driver.probe = hda_ext_drv_probe; 246 if (drv->remove) 247 drv->hdac.driver.remove = hdac_ext_drv_remove; 248 if (drv->shutdown) 249 drv->hdac.driver.shutdown = hdac_ext_drv_shutdown; 250 251 return driver_register(&drv->hdac.driver); 252 } 253 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); 254 255 /** 256 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices 257 * 258 * @drv: ext hda driver structure 259 */ 260 void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv) 261 { 262 driver_unregister(&drv->hdac.driver); 263 } 264 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 265