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 mutex_init(&ebus->lock); 109 ebus->cmd_dma_state = true; 110 111 return 0; 112 } 113 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init); 114 115 /** 116 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus 117 * @ebus: the pointer to extended bus object 118 */ 119 void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus) 120 { 121 snd_hdac_bus_exit(&ebus->bus); 122 WARN_ON(!list_empty(&ebus->hlink_list)); 123 } 124 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit); 125 126 static void default_release(struct device *dev) 127 { 128 snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev)); 129 } 130 131 /** 132 * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device 133 * @ebus: hdac extended bus to attach to 134 * @addr: codec address 135 * 136 * Returns zero for success or a negative error code. 137 */ 138 int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr) 139 { 140 struct hdac_ext_device *edev; 141 struct hdac_device *hdev = NULL; 142 struct hdac_bus *bus = ebus_to_hbus(ebus); 143 char name[15]; 144 int ret; 145 146 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 147 if (!edev) 148 return -ENOMEM; 149 hdev = &edev->hdev; 150 edev->ebus = ebus; 151 152 snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr); 153 154 ret = snd_hdac_device_init(hdev, bus, name, addr); 155 if (ret < 0) { 156 dev_err(bus->dev, "device init failed for hdac device\n"); 157 return ret; 158 } 159 hdev->type = HDA_DEV_ASOC; 160 hdev->dev.release = default_release; 161 162 ret = snd_hdac_device_register(hdev); 163 if (ret) { 164 dev_err(bus->dev, "failed to register hdac device\n"); 165 snd_hdac_ext_bus_device_exit(hdev); 166 return ret; 167 } 168 169 return 0; 170 } 171 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); 172 173 /** 174 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device 175 * @hdev: hdac device to clean up 176 */ 177 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) 178 { 179 struct hdac_ext_device *edev = to_ehdac_device(hdev); 180 181 snd_hdac_device_exit(hdev); 182 kfree(edev); 183 } 184 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 185 186 /** 187 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices 188 * 189 * @ebus: HD-audio extended bus 190 */ 191 void snd_hdac_ext_bus_device_remove(struct hdac_ext_bus *ebus) 192 { 193 struct hdac_device *codec, *__codec; 194 /* 195 * we need to remove all the codec devices objects created in the 196 * snd_hdac_ext_bus_device_init 197 */ 198 list_for_each_entry_safe(codec, __codec, &ebus->bus.codec_list, list) { 199 snd_hdac_device_unregister(codec); 200 put_device(&codec->dev); 201 } 202 } 203 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 204 #define dev_to_hdac(dev) (container_of((dev), \ 205 struct hdac_device, dev)) 206 207 static inline struct hdac_ext_driver *get_edrv(struct device *dev) 208 { 209 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); 210 struct hdac_ext_driver *edrv = to_ehdac_driver(hdrv); 211 212 return edrv; 213 } 214 215 static inline struct hdac_ext_device *get_edev(struct device *dev) 216 { 217 struct hdac_device *hdev = dev_to_hdac_dev(dev); 218 struct hdac_ext_device *edev = to_ehdac_device(hdev); 219 220 return edev; 221 } 222 223 static int hda_ext_drv_probe(struct device *dev) 224 { 225 return (get_edrv(dev))->probe(get_edev(dev)); 226 } 227 228 static int hdac_ext_drv_remove(struct device *dev) 229 { 230 return (get_edrv(dev))->remove(get_edev(dev)); 231 } 232 233 static void hdac_ext_drv_shutdown(struct device *dev) 234 { 235 return (get_edrv(dev))->shutdown(get_edev(dev)); 236 } 237 238 /** 239 * snd_hda_ext_driver_register - register a driver for ext hda devices 240 * 241 * @drv: ext hda driver structure 242 */ 243 int snd_hda_ext_driver_register(struct hdac_ext_driver *drv) 244 { 245 drv->hdac.type = HDA_DEV_ASOC; 246 drv->hdac.driver.bus = &snd_hda_bus_type; 247 /* we use default match */ 248 249 if (drv->probe) 250 drv->hdac.driver.probe = hda_ext_drv_probe; 251 if (drv->remove) 252 drv->hdac.driver.remove = hdac_ext_drv_remove; 253 if (drv->shutdown) 254 drv->hdac.driver.shutdown = hdac_ext_drv_shutdown; 255 256 return driver_register(&drv->hdac.driver); 257 } 258 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); 259 260 /** 261 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices 262 * 263 * @drv: ext hda driver structure 264 */ 265 void snd_hda_ext_driver_unregister(struct hdac_ext_driver *drv) 266 { 267 driver_unregister(&drv->hdac.driver); 268 } 269 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 270