1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * hdac-ext-bus.c - HD-audio extended core bus functions. 4 * 5 * Copyright (C) 2014-2015 Intel Corp 6 * Author: Jeeja KP <jeeja.kp@intel.com> 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 10 */ 11 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/io.h> 15 #include <sound/hdaudio_ext.h> 16 17 MODULE_DESCRIPTION("HDA extended core"); 18 MODULE_LICENSE("GPL v2"); 19 20 static void hdac_ext_writel(u32 value, u32 __iomem *addr) 21 { 22 writel(value, addr); 23 } 24 25 static u32 hdac_ext_readl(u32 __iomem *addr) 26 { 27 return readl(addr); 28 } 29 30 static void hdac_ext_writew(u16 value, u16 __iomem *addr) 31 { 32 writew(value, addr); 33 } 34 35 static u16 hdac_ext_readw(u16 __iomem *addr) 36 { 37 return readw(addr); 38 } 39 40 static void hdac_ext_writeb(u8 value, u8 __iomem *addr) 41 { 42 writeb(value, addr); 43 } 44 45 static u8 hdac_ext_readb(u8 __iomem *addr) 46 { 47 return readb(addr); 48 } 49 50 static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type, 51 size_t size, struct snd_dma_buffer *buf) 52 { 53 return snd_dma_alloc_pages(type, bus->dev, size, buf); 54 } 55 56 static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf) 57 { 58 snd_dma_free_pages(buf); 59 } 60 61 static const struct hdac_io_ops hdac_ext_default_io = { 62 .reg_writel = hdac_ext_writel, 63 .reg_readl = hdac_ext_readl, 64 .reg_writew = hdac_ext_writew, 65 .reg_readw = hdac_ext_readw, 66 .reg_writeb = hdac_ext_writeb, 67 .reg_readb = hdac_ext_readb, 68 .dma_alloc_pages = hdac_ext_dma_alloc_pages, 69 .dma_free_pages = hdac_ext_dma_free_pages, 70 }; 71 72 /** 73 * snd_hdac_ext_bus_init - initialize a HD-audio extended bus 74 * @ebus: the pointer to extended bus object 75 * @dev: device pointer 76 * @ops: bus verb operators 77 * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use 78 * default ops 79 * 80 * Returns 0 if successful, or a negative error code. 81 */ 82 int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev, 83 const struct hdac_bus_ops *ops, 84 const struct hdac_io_ops *io_ops, 85 const struct hdac_ext_bus_ops *ext_ops) 86 { 87 int ret; 88 static int idx; 89 90 /* check if io ops are provided, if not load the defaults */ 91 if (io_ops == NULL) 92 io_ops = &hdac_ext_default_io; 93 94 ret = snd_hdac_bus_init(bus, dev, ops, io_ops); 95 if (ret < 0) 96 return ret; 97 98 bus->ext_ops = ext_ops; 99 bus->idx = idx++; 100 bus->cmd_dma_state = true; 101 102 return 0; 103 } 104 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init); 105 106 /** 107 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus 108 * @ebus: the pointer to extended bus object 109 */ 110 void snd_hdac_ext_bus_exit(struct hdac_bus *bus) 111 { 112 snd_hdac_bus_exit(bus); 113 WARN_ON(!list_empty(&bus->hlink_list)); 114 } 115 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit); 116 117 static void default_release(struct device *dev) 118 { 119 snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev)); 120 } 121 122 /** 123 * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device 124 * @ebus: hdac extended bus to attach to 125 * @addr: codec address 126 * 127 * Returns zero for success or a negative error code. 128 */ 129 int snd_hdac_ext_bus_device_init(struct hdac_bus *bus, int addr, 130 struct hdac_device *hdev) 131 { 132 char name[15]; 133 int ret; 134 135 hdev->bus = bus; 136 137 snprintf(name, sizeof(name), "ehdaudio%dD%d", bus->idx, addr); 138 139 ret = snd_hdac_device_init(hdev, bus, name, addr); 140 if (ret < 0) { 141 dev_err(bus->dev, "device init failed for hdac device\n"); 142 return ret; 143 } 144 hdev->type = HDA_DEV_ASOC; 145 hdev->dev.release = default_release; 146 147 ret = snd_hdac_device_register(hdev); 148 if (ret) { 149 dev_err(bus->dev, "failed to register hdac device\n"); 150 snd_hdac_ext_bus_device_exit(hdev); 151 return ret; 152 } 153 154 return 0; 155 } 156 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); 157 158 /** 159 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device 160 * @hdev: hdac device to clean up 161 */ 162 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) 163 { 164 snd_hdac_device_exit(hdev); 165 } 166 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 167 168 /** 169 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices 170 * 171 * @ebus: HD-audio extended bus 172 */ 173 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus) 174 { 175 struct hdac_device *codec, *__codec; 176 /* 177 * we need to remove all the codec devices objects created in the 178 * snd_hdac_ext_bus_device_init 179 */ 180 list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) { 181 snd_hdac_device_unregister(codec); 182 put_device(&codec->dev); 183 } 184 } 185 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 186 #define dev_to_hdac(dev) (container_of((dev), \ 187 struct hdac_device, dev)) 188 189 static inline struct hdac_driver *get_hdrv(struct device *dev) 190 { 191 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); 192 return hdrv; 193 } 194 195 static inline struct hdac_device *get_hdev(struct device *dev) 196 { 197 struct hdac_device *hdev = dev_to_hdac_dev(dev); 198 return hdev; 199 } 200 201 static int hda_ext_drv_probe(struct device *dev) 202 { 203 return (get_hdrv(dev))->probe(get_hdev(dev)); 204 } 205 206 static int hdac_ext_drv_remove(struct device *dev) 207 { 208 return (get_hdrv(dev))->remove(get_hdev(dev)); 209 } 210 211 static void hdac_ext_drv_shutdown(struct device *dev) 212 { 213 return (get_hdrv(dev))->shutdown(get_hdev(dev)); 214 } 215 216 /** 217 * snd_hda_ext_driver_register - register a driver for ext hda devices 218 * 219 * @drv: ext hda driver structure 220 */ 221 int snd_hda_ext_driver_register(struct hdac_driver *drv) 222 { 223 drv->type = HDA_DEV_ASOC; 224 drv->driver.bus = &snd_hda_bus_type; 225 /* we use default match */ 226 227 if (drv->probe) 228 drv->driver.probe = hda_ext_drv_probe; 229 if (drv->remove) 230 drv->driver.remove = hdac_ext_drv_remove; 231 if (drv->shutdown) 232 drv->driver.shutdown = hdac_ext_drv_shutdown; 233 234 return driver_register(&drv->driver); 235 } 236 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); 237 238 /** 239 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices 240 * 241 * @drv: ext hda driver structure 242 */ 243 void snd_hda_ext_driver_unregister(struct hdac_driver *drv) 244 { 245 driver_unregister(&drv->driver); 246 } 247 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 248