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_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_device *hdev = NULL; 137 struct hdac_bus *bus = ebus_to_hbus(ebus); 138 char name[15]; 139 int ret; 140 141 hdev = kzalloc(sizeof(*hdev), GFP_KERNEL); 142 if (!hdev) 143 return -ENOMEM; 144 145 snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->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 return 0; 162 } 163 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); 164 165 /** 166 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device 167 * @hdev: hdac device to clean up 168 */ 169 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) 170 { 171 snd_hdac_device_exit(hdev); 172 kfree(hdev); 173 } 174 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 175