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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | // SPDX-License-Identifier: GPL-2.0-only /* * oxfw_hwdep.c - a part of driver for OXFW970/971 based devices * * Copyright (c) 2014 Takashi Sakamoto */ /* * This codes give three functionality. * * 1.get firewire node information * 2.get notification about starting/stopping stream * 3.lock/unlock stream */ #include "oxfw.h" static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, loff_t *offset) { struct snd_oxfw *oxfw = hwdep->private_data; DEFINE_WAIT(wait); union snd_firewire_event event; spin_lock_irq(&oxfw->lock); while (!oxfw->dev_lock_changed) { prepare_to_wait(&oxfw->hwdep_wait, &wait, TASK_INTERRUPTIBLE); spin_unlock_irq(&oxfw->lock); schedule(); finish_wait(&oxfw->hwdep_wait, &wait); if (signal_pending(current)) return -ERESTARTSYS; spin_lock_irq(&oxfw->lock); } memset(&event, 0, sizeof(event)); event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; event.lock_status.status = (oxfw->dev_lock_count > 0); oxfw->dev_lock_changed = false; count = min_t(long, count, sizeof(event.lock_status)); spin_unlock_irq(&oxfw->lock); if (copy_to_user(buf, &event, count)) return -EFAULT; return count; } static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait) { struct snd_oxfw *oxfw = hwdep->private_data; __poll_t events; poll_wait(file, &oxfw->hwdep_wait, wait); spin_lock_irq(&oxfw->lock); if (oxfw->dev_lock_changed) events = EPOLLIN | EPOLLRDNORM; else events = 0; spin_unlock_irq(&oxfw->lock); return events; } static int hwdep_get_info(struct snd_oxfw *oxfw, void __user *arg) { struct fw_device *dev = fw_parent_device(oxfw->unit); struct snd_firewire_get_info info; memset(&info, 0, sizeof(info)); info.type = SNDRV_FIREWIRE_TYPE_OXFW; info.card = dev->card->index; *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); strscpy(info.device_name, dev_name(&dev->device), sizeof(info.device_name)); if (copy_to_user(arg, &info, sizeof(info))) return -EFAULT; return 0; } static int hwdep_lock(struct snd_oxfw *oxfw) { int err; spin_lock_irq(&oxfw->lock); if (oxfw->dev_lock_count == 0) { oxfw->dev_lock_count = -1; err = 0; } else { err = -EBUSY; } spin_unlock_irq(&oxfw->lock); return err; } static int hwdep_unlock(struct snd_oxfw *oxfw) { int err; spin_lock_irq(&oxfw->lock); if (oxfw->dev_lock_count == -1) { oxfw->dev_lock_count = 0; err = 0; } else { err = -EBADFD; } spin_unlock_irq(&oxfw->lock); return err; } static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) { struct snd_oxfw *oxfw = hwdep->private_data; spin_lock_irq(&oxfw->lock); if (oxfw->dev_lock_count == -1) oxfw->dev_lock_count = 0; spin_unlock_irq(&oxfw->lock); return 0; } static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, unsigned int cmd, unsigned long arg) { struct snd_oxfw *oxfw = hwdep->private_data; switch (cmd) { case SNDRV_FIREWIRE_IOCTL_GET_INFO: return hwdep_get_info(oxfw, (void __user *)arg); case SNDRV_FIREWIRE_IOCTL_LOCK: return hwdep_lock(oxfw); case SNDRV_FIREWIRE_IOCTL_UNLOCK: return hwdep_unlock(oxfw); default: return -ENOIOCTLCMD; } } #ifdef CONFIG_COMPAT static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file, unsigned int cmd, unsigned long arg) { return hwdep_ioctl(hwdep, file, cmd, (unsigned long)compat_ptr(arg)); } #else #define hwdep_compat_ioctl NULL #endif int snd_oxfw_create_hwdep(struct snd_oxfw *oxfw) { static const struct snd_hwdep_ops hwdep_ops = { .read = hwdep_read, .release = hwdep_release, .poll = hwdep_poll, .ioctl = hwdep_ioctl, .ioctl_compat = hwdep_compat_ioctl, }; struct snd_hwdep *hwdep; int err; err = snd_hwdep_new(oxfw->card, oxfw->card->driver, 0, &hwdep); if (err < 0) goto end; strcpy(hwdep->name, oxfw->card->driver); hwdep->iface = SNDRV_HWDEP_IFACE_FW_OXFW; hwdep->ops = hwdep_ops; hwdep->private_data = oxfw; hwdep->exclusive = true; end: return err; } |