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 bus->idx = idx++; 108 bus->cmd_dma_state = true; 109 110 return 0; 111 } 112 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init); 113 114 /** 115 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus 116 * @ebus: the pointer to extended bus object 117 */ 118 void snd_hdac_ext_bus_exit(struct hdac_bus *bus) 119 { 120 snd_hdac_bus_exit(bus); 121 WARN_ON(!list_empty(&bus->hlink_list)); 122 } 123 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit); 124 125 static void default_release(struct device *dev) 126 { 127 snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev)); 128 } 129 130 /** 131 * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device 132 * @ebus: hdac extended bus to attach to 133 * @addr: codec address 134 * 135 * Returns zero for success or a negative error code. 136 */ 137 int snd_hdac_ext_bus_device_init(struct hdac_bus *bus, int addr, 138 struct hdac_device *hdev) 139 { 140 char name[15]; 141 int ret; 142 143 hdev->bus = bus; 144 145 snprintf(name, sizeof(name), "ehdaudio%dD%d", bus->idx, addr); 146 147 ret = snd_hdac_device_init(hdev, bus, name, addr); 148 if (ret < 0) { 149 dev_err(bus->dev, "device init failed for hdac device\n"); 150 return ret; 151 } 152 hdev->type = HDA_DEV_ASOC; 153 hdev->dev.release = default_release; 154 155 ret = snd_hdac_device_register(hdev); 156 if (ret) { 157 dev_err(bus->dev, "failed to register hdac device\n"); 158 snd_hdac_ext_bus_device_exit(hdev); 159 return ret; 160 } 161 162 return 0; 163 } 164 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); 165 166 /** 167 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device 168 * @hdev: hdac device to clean up 169 */ 170 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) 171 { 172 snd_hdac_device_exit(hdev); 173 kfree(hdev); 174 } 175 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 176 177 /** 178 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices 179 * 180 * @ebus: HD-audio extended bus 181 */ 182 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus) 183 { 184 struct hdac_device *codec, *__codec; 185 /* 186 * we need to remove all the codec devices objects created in the 187 * snd_hdac_ext_bus_device_init 188 */ 189 list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) { 190 snd_hdac_device_unregister(codec); 191 put_device(&codec->dev); 192 } 193 } 194 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 195 #define dev_to_hdac(dev) (container_of((dev), \ 196 struct hdac_device, dev)) 197 198 static inline struct hdac_driver *get_hdrv(struct device *dev) 199 { 200 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); 201 return hdrv; 202 } 203 204 static inline struct hdac_device *get_hdev(struct device *dev) 205 { 206 struct hdac_device *hdev = dev_to_hdac_dev(dev); 207 return hdev; 208 } 209 210 static int hda_ext_drv_probe(struct device *dev) 211 { 212 return (get_hdrv(dev))->probe(get_hdev(dev)); 213 } 214 215 static int hdac_ext_drv_remove(struct device *dev) 216 { 217 return (get_hdrv(dev))->remove(get_hdev(dev)); 218 } 219 220 static void hdac_ext_drv_shutdown(struct device *dev) 221 { 222 return (get_hdrv(dev))->shutdown(get_hdev(dev)); 223 } 224 225 /** 226 * snd_hda_ext_driver_register - register a driver for ext hda devices 227 * 228 * @drv: ext hda driver structure 229 */ 230 int snd_hda_ext_driver_register(struct hdac_driver *drv) 231 { 232 drv->type = HDA_DEV_ASOC; 233 drv->driver.bus = &snd_hda_bus_type; 234 /* we use default match */ 235 236 if (drv->probe) 237 drv->driver.probe = hda_ext_drv_probe; 238 if (drv->remove) 239 drv->driver.remove = hdac_ext_drv_remove; 240 if (drv->shutdown) 241 drv->driver.shutdown = hdac_ext_drv_shutdown; 242 243 return driver_register(&drv->driver); 244 } 245 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); 246 247 /** 248 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices 249 * 250 * @drv: ext hda driver structure 251 */ 252 void snd_hda_ext_driver_unregister(struct hdac_driver *drv) 253 { 254 driver_unregister(&drv->driver); 255 } 256 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 257