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_ext_bus *ebus, struct device *dev, 91 const struct hdac_bus_ops *ops, 92 const struct hdac_io_ops *io_ops) 93 { 94 int ret; 95 static int idx; 96 97 /* check if io ops are provided, if not load the defaults */ 98 if (io_ops == NULL) 99 io_ops = &hdac_ext_default_io; 100 101 ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops); 102 if (ret < 0) 103 return ret; 104 105 INIT_LIST_HEAD(&ebus->hlink_list); 106 ebus->idx = idx++; 107 108 return 0; 109 } 110 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init); 111 112 /** 113 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus 114 * @ebus: the pointer to extended bus object 115 */ 116 void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus) 117 { 118 snd_hdac_bus_exit(&ebus->bus); 119 WARN_ON(!list_empty(&ebus->hlink_list)); 120 } 121 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit); 122 123 static void default_release(struct device *dev) 124 { 125 snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev)); 126 } 127 128 /** 129 * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device 130 * @ebus: hdac extended bus to attach to 131 * @addr: codec address 132 * 133 * Returns zero for success or a negative error code. 134 */ 135 int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr) 136 { 137 struct hdac_ext_device *edev; 138 struct hdac_device *hdev = NULL; 139 struct hdac_bus *bus = ebus_to_hbus(ebus); 140 char name[15]; 141 int ret; 142 143 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 144 if (!edev) 145 return -ENOMEM; 146 hdev = &edev->hdac; 147 148 snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->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 struct hdac_ext_device *edev = to_ehdac_device(hdev); 176 177 snd_hdac_device_exit(hdev); 178 kfree(edev); 179 } 180 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 181 182 /** 183 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices 184 * 185 * @ebus: HD-audio extended bus 186 */ 187 void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus) 188 { 189 struct hdac_device *codec, *__codec; 190 /* 191 * we need to remove all the codec devices objects created in the 192 * snd_hdac_ext_bus_device_init 193 */ 194 list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) { 195 snd_hdac_device_unregister(codec); 196 put_device(&codec->dev); 197 } 198 } 199 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 200 #define dev_to_hdac(dev) (container_of((dev), \ 201 struct hdac_device, dev)) 202 203 static inline struct hdac_ext_driver *get_edrv(struct device *dev) 204 { 205 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); 206 struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv); 207 208 return edrv; 209 } 210 211 static inline struct hdac_ext_device *get_edev(struct device *dev) 212 { 213 struct hdac_device *hdev = dev_to_hdac_dev(dev); 214 struct hdac_ext_device *edev = to_ehdac_device(hdev); 215 216 return edev; 217 } 218 219 static int hda_ext_drv_probe(struct device *dev) 220 { 221 return (get_edrv(dev))->probe(get_edev(dev)); 222 } 223 224 static int hdac_ext_drv_remove(struct device *dev) 225 { 226 return (get_edrv(dev))->remove(get_edev(dev)); 227 } 228 229 static void hdac_ext_drv_shutdown(struct device *dev) 230 { 231 return (get_edrv(dev))->shutdown(get_edev(dev)); 232 } 233 234 /** 235 * snd_hda_ext_driver_register - register a driver for ext hda devices 236 * 237 * @drv: ext hda driver structure 238 */ 239 int snd_hda_ext_driver_register(struct hdac_ext_driver *drv) 240 { 241 drv->hdac.type = HDA_DEV_ASOC; 242 drv->hdac.driver.bus = &snd_hda_bus_type; 243 /* we use default match */ 244 245 if (drv->probe) 246 drv->hdac.driver.probe = hda_ext_drv_probe; 247 if (drv->remove) 248 drv->hdac.driver.remove = hdac_ext_drv_remove; 249 if (drv->shutdown) 250 drv->hdac.driver.shutdown = hdac_ext_drv_shutdown; 251 252 return driver_register(&drv->hdac.driver); 253 } 254 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); 255 256 /** 257 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices 258 * 259 * @drv: ext hda driver structure 260 */ 261 void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv) 262 { 263 driver_unregister(&drv->hdac.driver); 264 } 265 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 266