1 |
3 |
xianfeng |
/*
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2 |
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* Routines for driver control interface
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3 |
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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23 |
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#include <linux/threads.h>
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24 |
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#include <linux/interrupt.h>
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25 |
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#include <linux/slab.h>
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26 |
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#include <linux/vmalloc.h>
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27 |
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#include <linux/time.h>
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28 |
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#include <sound/core.h>
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29 |
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#include <sound/minors.h>
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30 |
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#include <sound/info.h>
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31 |
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#include <sound/control.h>
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32 |
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33 |
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/* max number of user-defined controls */
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34 |
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#define MAX_USER_CONTROLS 32
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35 |
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36 |
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struct snd_kctl_ioctl {
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37 |
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struct list_head list; /* list of all ioctls */
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38 |
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snd_kctl_ioctl_func_t fioctl;
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39 |
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};
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40 |
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41 |
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static DECLARE_RWSEM(snd_ioctl_rwsem);
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42 |
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static LIST_HEAD(snd_control_ioctls);
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43 |
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#ifdef CONFIG_COMPAT
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44 |
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static LIST_HEAD(snd_control_compat_ioctls);
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#endif
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46 |
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47 |
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static int snd_ctl_open(struct inode *inode, struct file *file)
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48 |
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{
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49 |
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unsigned long flags;
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50 |
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struct snd_card *card;
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51 |
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struct snd_ctl_file *ctl;
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52 |
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int err;
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53 |
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54 |
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card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
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55 |
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if (!card) {
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56 |
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err = -ENODEV;
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57 |
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goto __error1;
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58 |
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}
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59 |
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err = snd_card_file_add(card, file);
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60 |
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if (err < 0) {
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61 |
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err = -ENODEV;
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62 |
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goto __error1;
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63 |
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}
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64 |
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if (!try_module_get(card->module)) {
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65 |
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err = -EFAULT;
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66 |
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goto __error2;
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67 |
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}
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68 |
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ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
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69 |
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if (ctl == NULL) {
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70 |
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err = -ENOMEM;
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71 |
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goto __error;
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72 |
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}
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73 |
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INIT_LIST_HEAD(&ctl->events);
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74 |
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init_waitqueue_head(&ctl->change_sleep);
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75 |
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spin_lock_init(&ctl->read_lock);
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76 |
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ctl->card = card;
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77 |
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ctl->prefer_pcm_subdevice = -1;
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78 |
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ctl->prefer_rawmidi_subdevice = -1;
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79 |
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ctl->pid = current->pid;
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80 |
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file->private_data = ctl;
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81 |
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write_lock_irqsave(&card->ctl_files_rwlock, flags);
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list_add_tail(&ctl->list, &card->ctl_files);
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83 |
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write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
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84 |
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return 0;
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85 |
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86 |
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__error:
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87 |
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module_put(card->module);
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88 |
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__error2:
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89 |
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snd_card_file_remove(card, file);
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90 |
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__error1:
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91 |
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return err;
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92 |
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}
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93 |
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94 |
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static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
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95 |
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{
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96 |
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unsigned long flags;
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97 |
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struct snd_kctl_event *cread;
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98 |
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99 |
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spin_lock_irqsave(&ctl->read_lock, flags);
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100 |
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while (!list_empty(&ctl->events)) {
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101 |
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cread = snd_kctl_event(ctl->events.next);
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102 |
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list_del(&cread->list);
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103 |
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kfree(cread);
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104 |
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}
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105 |
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spin_unlock_irqrestore(&ctl->read_lock, flags);
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106 |
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}
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107 |
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108 |
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static int snd_ctl_release(struct inode *inode, struct file *file)
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109 |
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{
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110 |
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unsigned long flags;
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111 |
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struct snd_card *card;
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112 |
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struct snd_ctl_file *ctl;
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113 |
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struct snd_kcontrol *control;
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114 |
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unsigned int idx;
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115 |
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116 |
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ctl = file->private_data;
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117 |
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fasync_helper(-1, file, 0, &ctl->fasync);
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118 |
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file->private_data = NULL;
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119 |
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card = ctl->card;
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120 |
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write_lock_irqsave(&card->ctl_files_rwlock, flags);
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list_del(&ctl->list);
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write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
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down_write(&card->controls_rwsem);
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list_for_each_entry(control, &card->controls, list)
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for (idx = 0; idx < control->count; idx++)
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126 |
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if (control->vd[idx].owner == ctl)
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127 |
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control->vd[idx].owner = NULL;
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128 |
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up_write(&card->controls_rwsem);
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129 |
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snd_ctl_empty_read_queue(ctl);
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130 |
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kfree(ctl);
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131 |
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module_put(card->module);
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132 |
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snd_card_file_remove(card, file);
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133 |
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return 0;
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134 |
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}
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135 |
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136 |
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void snd_ctl_notify(struct snd_card *card, unsigned int mask,
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137 |
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struct snd_ctl_elem_id *id)
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138 |
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{
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139 |
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unsigned long flags;
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140 |
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struct snd_ctl_file *ctl;
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141 |
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struct snd_kctl_event *ev;
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142 |
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143 |
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snd_assert(card != NULL && id != NULL, return);
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144 |
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read_lock(&card->ctl_files_rwlock);
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145 |
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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146 |
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card->mixer_oss_change_count++;
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147 |
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#endif
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148 |
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list_for_each_entry(ctl, &card->ctl_files, list) {
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149 |
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if (!ctl->subscribed)
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150 |
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continue;
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151 |
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spin_lock_irqsave(&ctl->read_lock, flags);
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152 |
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list_for_each_entry(ev, &ctl->events, list) {
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153 |
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if (ev->id.numid == id->numid) {
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154 |
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ev->mask |= mask;
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155 |
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goto _found;
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156 |
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}
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157 |
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}
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158 |
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ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
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159 |
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if (ev) {
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160 |
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ev->id = *id;
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161 |
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ev->mask = mask;
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162 |
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list_add_tail(&ev->list, &ctl->events);
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163 |
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} else {
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164 |
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snd_printk(KERN_ERR "No memory available to allocate event\n");
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165 |
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}
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166 |
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_found:
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167 |
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wake_up(&ctl->change_sleep);
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168 |
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spin_unlock_irqrestore(&ctl->read_lock, flags);
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169 |
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kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
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170 |
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}
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171 |
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read_unlock(&card->ctl_files_rwlock);
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172 |
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}
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173 |
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174 |
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EXPORT_SYMBOL(snd_ctl_notify);
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175 |
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176 |
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/**
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177 |
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* snd_ctl_new - create a control instance from the template
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178 |
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* @control: the control template
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179 |
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* @access: the default control access
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180 |
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*
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181 |
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* Allocates a new struct snd_kcontrol instance and copies the given template
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182 |
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* to the new instance. It does not copy volatile data (access).
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183 |
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*
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184 |
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* Returns the pointer of the new instance, or NULL on failure.
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185 |
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*/
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186 |
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static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
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187 |
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unsigned int access)
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188 |
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{
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189 |
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struct snd_kcontrol *kctl;
|
190 |
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unsigned int idx;
|
191 |
|
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|
192 |
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snd_assert(control != NULL, return NULL);
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193 |
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snd_assert(control->count > 0, return NULL);
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194 |
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kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
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195 |
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if (kctl == NULL) {
|
196 |
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snd_printk(KERN_ERR "Cannot allocate control instance\n");
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197 |
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return NULL;
|
198 |
|
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}
|
199 |
|
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*kctl = *control;
|
200 |
|
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for (idx = 0; idx < kctl->count; idx++)
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201 |
|
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kctl->vd[idx].access = access;
|
202 |
|
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return kctl;
|
203 |
|
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}
|
204 |
|
|
|
205 |
|
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/**
|
206 |
|
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* snd_ctl_new1 - create a control instance from the template
|
207 |
|
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* @ncontrol: the initialization record
|
208 |
|
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* @private_data: the private data to set
|
209 |
|
|
*
|
210 |
|
|
* Allocates a new struct snd_kcontrol instance and initialize from the given
|
211 |
|
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* template. When the access field of ncontrol is 0, it's assumed as
|
212 |
|
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* READWRITE access. When the count field is 0, it's assumes as one.
|
213 |
|
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*
|
214 |
|
|
* Returns the pointer of the newly generated instance, or NULL on failure.
|
215 |
|
|
*/
|
216 |
|
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struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
|
217 |
|
|
void *private_data)
|
218 |
|
|
{
|
219 |
|
|
struct snd_kcontrol kctl;
|
220 |
|
|
unsigned int access;
|
221 |
|
|
|
222 |
|
|
snd_assert(ncontrol != NULL, return NULL);
|
223 |
|
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snd_assert(ncontrol->info != NULL, return NULL);
|
224 |
|
|
memset(&kctl, 0, sizeof(kctl));
|
225 |
|
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kctl.id.iface = ncontrol->iface;
|
226 |
|
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kctl.id.device = ncontrol->device;
|
227 |
|
|
kctl.id.subdevice = ncontrol->subdevice;
|
228 |
|
|
if (ncontrol->name)
|
229 |
|
|
strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
|
230 |
|
|
kctl.id.index = ncontrol->index;
|
231 |
|
|
kctl.count = ncontrol->count ? ncontrol->count : 1;
|
232 |
|
|
access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
|
233 |
|
|
(ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
|
234 |
|
|
SNDRV_CTL_ELEM_ACCESS_INACTIVE|
|
235 |
|
|
SNDRV_CTL_ELEM_ACCESS_DINDIRECT|
|
236 |
|
|
SNDRV_CTL_ELEM_ACCESS_INDIRECT|
|
237 |
|
|
SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
|
238 |
|
|
SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
|
239 |
|
|
kctl.info = ncontrol->info;
|
240 |
|
|
kctl.get = ncontrol->get;
|
241 |
|
|
kctl.put = ncontrol->put;
|
242 |
|
|
kctl.tlv.p = ncontrol->tlv.p;
|
243 |
|
|
kctl.private_value = ncontrol->private_value;
|
244 |
|
|
kctl.private_data = private_data;
|
245 |
|
|
return snd_ctl_new(&kctl, access);
|
246 |
|
|
}
|
247 |
|
|
|
248 |
|
|
EXPORT_SYMBOL(snd_ctl_new1);
|
249 |
|
|
|
250 |
|
|
/**
|
251 |
|
|
* snd_ctl_free_one - release the control instance
|
252 |
|
|
* @kcontrol: the control instance
|
253 |
|
|
*
|
254 |
|
|
* Releases the control instance created via snd_ctl_new()
|
255 |
|
|
* or snd_ctl_new1().
|
256 |
|
|
* Don't call this after the control was added to the card.
|
257 |
|
|
*/
|
258 |
|
|
void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
|
259 |
|
|
{
|
260 |
|
|
if (kcontrol) {
|
261 |
|
|
if (kcontrol->private_free)
|
262 |
|
|
kcontrol->private_free(kcontrol);
|
263 |
|
|
kfree(kcontrol);
|
264 |
|
|
}
|
265 |
|
|
}
|
266 |
|
|
|
267 |
|
|
EXPORT_SYMBOL(snd_ctl_free_one);
|
268 |
|
|
|
269 |
|
|
static unsigned int snd_ctl_hole_check(struct snd_card *card,
|
270 |
|
|
unsigned int count)
|
271 |
|
|
{
|
272 |
|
|
struct snd_kcontrol *kctl;
|
273 |
|
|
|
274 |
|
|
list_for_each_entry(kctl, &card->controls, list) {
|
275 |
|
|
if ((kctl->id.numid <= card->last_numid &&
|
276 |
|
|
kctl->id.numid + kctl->count > card->last_numid) ||
|
277 |
|
|
(kctl->id.numid <= card->last_numid + count - 1 &&
|
278 |
|
|
kctl->id.numid + kctl->count > card->last_numid + count - 1))
|
279 |
|
|
return card->last_numid = kctl->id.numid + kctl->count - 1;
|
280 |
|
|
}
|
281 |
|
|
return card->last_numid;
|
282 |
|
|
}
|
283 |
|
|
|
284 |
|
|
static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
|
285 |
|
|
{
|
286 |
|
|
unsigned int last_numid, iter = 100000;
|
287 |
|
|
|
288 |
|
|
last_numid = card->last_numid;
|
289 |
|
|
while (last_numid != snd_ctl_hole_check(card, count)) {
|
290 |
|
|
if (--iter == 0) {
|
291 |
|
|
/* this situation is very unlikely */
|
292 |
|
|
snd_printk(KERN_ERR "unable to allocate new control numid\n");
|
293 |
|
|
return -ENOMEM;
|
294 |
|
|
}
|
295 |
|
|
last_numid = card->last_numid;
|
296 |
|
|
}
|
297 |
|
|
return 0;
|
298 |
|
|
}
|
299 |
|
|
|
300 |
|
|
/**
|
301 |
|
|
* snd_ctl_add - add the control instance to the card
|
302 |
|
|
* @card: the card instance
|
303 |
|
|
* @kcontrol: the control instance to add
|
304 |
|
|
*
|
305 |
|
|
* Adds the control instance created via snd_ctl_new() or
|
306 |
|
|
* snd_ctl_new1() to the given card. Assigns also an unique
|
307 |
|
|
* numid used for fast search.
|
308 |
|
|
*
|
309 |
|
|
* Returns zero if successful, or a negative error code on failure.
|
310 |
|
|
*
|
311 |
|
|
* It frees automatically the control which cannot be added.
|
312 |
|
|
*/
|
313 |
|
|
int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
|
314 |
|
|
{
|
315 |
|
|
struct snd_ctl_elem_id id;
|
316 |
|
|
unsigned int idx;
|
317 |
|
|
int err = -EINVAL;
|
318 |
|
|
|
319 |
|
|
if (! kcontrol)
|
320 |
|
|
return err;
|
321 |
|
|
snd_assert(card != NULL, goto error);
|
322 |
|
|
snd_assert(kcontrol->info != NULL, goto error);
|
323 |
|
|
id = kcontrol->id;
|
324 |
|
|
down_write(&card->controls_rwsem);
|
325 |
|
|
if (snd_ctl_find_id(card, &id)) {
|
326 |
|
|
up_write(&card->controls_rwsem);
|
327 |
|
|
snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
|
328 |
|
|
id.iface,
|
329 |
|
|
id.device,
|
330 |
|
|
id.subdevice,
|
331 |
|
|
id.name,
|
332 |
|
|
id.index);
|
333 |
|
|
err = -EBUSY;
|
334 |
|
|
goto error;
|
335 |
|
|
}
|
336 |
|
|
if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
|
337 |
|
|
up_write(&card->controls_rwsem);
|
338 |
|
|
err = -ENOMEM;
|
339 |
|
|
goto error;
|
340 |
|
|
}
|
341 |
|
|
list_add_tail(&kcontrol->list, &card->controls);
|
342 |
|
|
card->controls_count += kcontrol->count;
|
343 |
|
|
kcontrol->id.numid = card->last_numid + 1;
|
344 |
|
|
card->last_numid += kcontrol->count;
|
345 |
|
|
up_write(&card->controls_rwsem);
|
346 |
|
|
for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
|
347 |
|
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
|
348 |
|
|
return 0;
|
349 |
|
|
|
350 |
|
|
error:
|
351 |
|
|
snd_ctl_free_one(kcontrol);
|
352 |
|
|
return err;
|
353 |
|
|
}
|
354 |
|
|
|
355 |
|
|
EXPORT_SYMBOL(snd_ctl_add);
|
356 |
|
|
|
357 |
|
|
/**
|
358 |
|
|
* snd_ctl_remove - remove the control from the card and release it
|
359 |
|
|
* @card: the card instance
|
360 |
|
|
* @kcontrol: the control instance to remove
|
361 |
|
|
*
|
362 |
|
|
* Removes the control from the card and then releases the instance.
|
363 |
|
|
* You don't need to call snd_ctl_free_one(). You must be in
|
364 |
|
|
* the write lock - down_write(&card->controls_rwsem).
|
365 |
|
|
*
|
366 |
|
|
* Returns 0 if successful, or a negative error code on failure.
|
367 |
|
|
*/
|
368 |
|
|
int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
|
369 |
|
|
{
|
370 |
|
|
struct snd_ctl_elem_id id;
|
371 |
|
|
unsigned int idx;
|
372 |
|
|
|
373 |
|
|
snd_assert(card != NULL && kcontrol != NULL, return -EINVAL);
|
374 |
|
|
list_del(&kcontrol->list);
|
375 |
|
|
card->controls_count -= kcontrol->count;
|
376 |
|
|
id = kcontrol->id;
|
377 |
|
|
for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
|
378 |
|
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
|
379 |
|
|
snd_ctl_free_one(kcontrol);
|
380 |
|
|
return 0;
|
381 |
|
|
}
|
382 |
|
|
|
383 |
|
|
EXPORT_SYMBOL(snd_ctl_remove);
|
384 |
|
|
|
385 |
|
|
/**
|
386 |
|
|
* snd_ctl_remove_id - remove the control of the given id and release it
|
387 |
|
|
* @card: the card instance
|
388 |
|
|
* @id: the control id to remove
|
389 |
|
|
*
|
390 |
|
|
* Finds the control instance with the given id, removes it from the
|
391 |
|
|
* card list and releases it.
|
392 |
|
|
*
|
393 |
|
|
* Returns 0 if successful, or a negative error code on failure.
|
394 |
|
|
*/
|
395 |
|
|
int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
|
396 |
|
|
{
|
397 |
|
|
struct snd_kcontrol *kctl;
|
398 |
|
|
int ret;
|
399 |
|
|
|
400 |
|
|
down_write(&card->controls_rwsem);
|
401 |
|
|
kctl = snd_ctl_find_id(card, id);
|
402 |
|
|
if (kctl == NULL) {
|
403 |
|
|
up_write(&card->controls_rwsem);
|
404 |
|
|
return -ENOENT;
|
405 |
|
|
}
|
406 |
|
|
ret = snd_ctl_remove(card, kctl);
|
407 |
|
|
up_write(&card->controls_rwsem);
|
408 |
|
|
return ret;
|
409 |
|
|
}
|
410 |
|
|
|
411 |
|
|
EXPORT_SYMBOL(snd_ctl_remove_id);
|
412 |
|
|
|
413 |
|
|
/**
|
414 |
|
|
* snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it
|
415 |
|
|
* @file: active control handle
|
416 |
|
|
* @id: the control id to remove
|
417 |
|
|
*
|
418 |
|
|
* Finds the control instance with the given id, removes it from the
|
419 |
|
|
* card list and releases it.
|
420 |
|
|
*
|
421 |
|
|
* Returns 0 if successful, or a negative error code on failure.
|
422 |
|
|
*/
|
423 |
|
|
static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file,
|
424 |
|
|
struct snd_ctl_elem_id *id)
|
425 |
|
|
{
|
426 |
|
|
struct snd_card *card = file->card;
|
427 |
|
|
struct snd_kcontrol *kctl;
|
428 |
|
|
int idx, ret;
|
429 |
|
|
|
430 |
|
|
down_write(&card->controls_rwsem);
|
431 |
|
|
kctl = snd_ctl_find_id(card, id);
|
432 |
|
|
if (kctl == NULL) {
|
433 |
|
|
up_write(&card->controls_rwsem);
|
434 |
|
|
return -ENOENT;
|
435 |
|
|
}
|
436 |
|
|
for (idx = 0; idx < kctl->count; idx++)
|
437 |
|
|
if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
|
438 |
|
|
up_write(&card->controls_rwsem);
|
439 |
|
|
return -EBUSY;
|
440 |
|
|
}
|
441 |
|
|
ret = snd_ctl_remove(card, kctl);
|
442 |
|
|
up_write(&card->controls_rwsem);
|
443 |
|
|
return ret;
|
444 |
|
|
}
|
445 |
|
|
|
446 |
|
|
/**
|
447 |
|
|
* snd_ctl_rename_id - replace the id of a control on the card
|
448 |
|
|
* @card: the card instance
|
449 |
|
|
* @src_id: the old id
|
450 |
|
|
* @dst_id: the new id
|
451 |
|
|
*
|
452 |
|
|
* Finds the control with the old id from the card, and replaces the
|
453 |
|
|
* id with the new one.
|
454 |
|
|
*
|
455 |
|
|
* Returns zero if successful, or a negative error code on failure.
|
456 |
|
|
*/
|
457 |
|
|
int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
|
458 |
|
|
struct snd_ctl_elem_id *dst_id)
|
459 |
|
|
{
|
460 |
|
|
struct snd_kcontrol *kctl;
|
461 |
|
|
|
462 |
|
|
down_write(&card->controls_rwsem);
|
463 |
|
|
kctl = snd_ctl_find_id(card, src_id);
|
464 |
|
|
if (kctl == NULL) {
|
465 |
|
|
up_write(&card->controls_rwsem);
|
466 |
|
|
return -ENOENT;
|
467 |
|
|
}
|
468 |
|
|
kctl->id = *dst_id;
|
469 |
|
|
kctl->id.numid = card->last_numid + 1;
|
470 |
|
|
card->last_numid += kctl->count;
|
471 |
|
|
up_write(&card->controls_rwsem);
|
472 |
|
|
return 0;
|
473 |
|
|
}
|
474 |
|
|
|
475 |
|
|
EXPORT_SYMBOL(snd_ctl_rename_id);
|
476 |
|
|
|
477 |
|
|
/**
|
478 |
|
|
* snd_ctl_find_numid - find the control instance with the given number-id
|
479 |
|
|
* @card: the card instance
|
480 |
|
|
* @numid: the number-id to search
|
481 |
|
|
*
|
482 |
|
|
* Finds the control instance with the given number-id from the card.
|
483 |
|
|
*
|
484 |
|
|
* Returns the pointer of the instance if found, or NULL if not.
|
485 |
|
|
*
|
486 |
|
|
* The caller must down card->controls_rwsem before calling this function
|
487 |
|
|
* (if the race condition can happen).
|
488 |
|
|
*/
|
489 |
|
|
struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
|
490 |
|
|
{
|
491 |
|
|
struct snd_kcontrol *kctl;
|
492 |
|
|
|
493 |
|
|
snd_assert(card != NULL && numid != 0, return NULL);
|
494 |
|
|
list_for_each_entry(kctl, &card->controls, list) {
|
495 |
|
|
if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
|
496 |
|
|
return kctl;
|
497 |
|
|
}
|
498 |
|
|
return NULL;
|
499 |
|
|
}
|
500 |
|
|
|
501 |
|
|
EXPORT_SYMBOL(snd_ctl_find_numid);
|
502 |
|
|
|
503 |
|
|
/**
|
504 |
|
|
* snd_ctl_find_id - find the control instance with the given id
|
505 |
|
|
* @card: the card instance
|
506 |
|
|
* @id: the id to search
|
507 |
|
|
*
|
508 |
|
|
* Finds the control instance with the given id from the card.
|
509 |
|
|
*
|
510 |
|
|
* Returns the pointer of the instance if found, or NULL if not.
|
511 |
|
|
*
|
512 |
|
|
* The caller must down card->controls_rwsem before calling this function
|
513 |
|
|
* (if the race condition can happen).
|
514 |
|
|
*/
|
515 |
|
|
struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
|
516 |
|
|
struct snd_ctl_elem_id *id)
|
517 |
|
|
{
|
518 |
|
|
struct snd_kcontrol *kctl;
|
519 |
|
|
|
520 |
|
|
snd_assert(card != NULL && id != NULL, return NULL);
|
521 |
|
|
if (id->numid != 0)
|
522 |
|
|
return snd_ctl_find_numid(card, id->numid);
|
523 |
|
|
list_for_each_entry(kctl, &card->controls, list) {
|
524 |
|
|
if (kctl->id.iface != id->iface)
|
525 |
|
|
continue;
|
526 |
|
|
if (kctl->id.device != id->device)
|
527 |
|
|
continue;
|
528 |
|
|
if (kctl->id.subdevice != id->subdevice)
|
529 |
|
|
continue;
|
530 |
|
|
if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
|
531 |
|
|
continue;
|
532 |
|
|
if (kctl->id.index > id->index)
|
533 |
|
|
continue;
|
534 |
|
|
if (kctl->id.index + kctl->count <= id->index)
|
535 |
|
|
continue;
|
536 |
|
|
return kctl;
|
537 |
|
|
}
|
538 |
|
|
return NULL;
|
539 |
|
|
}
|
540 |
|
|
|
541 |
|
|
EXPORT_SYMBOL(snd_ctl_find_id);
|
542 |
|
|
|
543 |
|
|
static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
|
544 |
|
|
unsigned int cmd, void __user *arg)
|
545 |
|
|
{
|
546 |
|
|
struct snd_ctl_card_info *info;
|
547 |
|
|
|
548 |
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
549 |
|
|
if (! info)
|
550 |
|
|
return -ENOMEM;
|
551 |
|
|
down_read(&snd_ioctl_rwsem);
|
552 |
|
|
info->card = card->number;
|
553 |
|
|
strlcpy(info->id, card->id, sizeof(info->id));
|
554 |
|
|
strlcpy(info->driver, card->driver, sizeof(info->driver));
|
555 |
|
|
strlcpy(info->name, card->shortname, sizeof(info->name));
|
556 |
|
|
strlcpy(info->longname, card->longname, sizeof(info->longname));
|
557 |
|
|
strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
|
558 |
|
|
strlcpy(info->components, card->components, sizeof(info->components));
|
559 |
|
|
up_read(&snd_ioctl_rwsem);
|
560 |
|
|
if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
|
561 |
|
|
kfree(info);
|
562 |
|
|
return -EFAULT;
|
563 |
|
|
}
|
564 |
|
|
kfree(info);
|
565 |
|
|
return 0;
|
566 |
|
|
}
|
567 |
|
|
|
568 |
|
|
static int snd_ctl_elem_list(struct snd_card *card,
|
569 |
|
|
struct snd_ctl_elem_list __user *_list)
|
570 |
|
|
{
|
571 |
|
|
struct list_head *plist;
|
572 |
|
|
struct snd_ctl_elem_list list;
|
573 |
|
|
struct snd_kcontrol *kctl;
|
574 |
|
|
struct snd_ctl_elem_id *dst, *id;
|
575 |
|
|
unsigned int offset, space, first, jidx;
|
576 |
|
|
|
577 |
|
|
if (copy_from_user(&list, _list, sizeof(list)))
|
578 |
|
|
return -EFAULT;
|
579 |
|
|
offset = list.offset;
|
580 |
|
|
space = list.space;
|
581 |
|
|
first = 0;
|
582 |
|
|
/* try limit maximum space */
|
583 |
|
|
if (space > 16384)
|
584 |
|
|
return -ENOMEM;
|
585 |
|
|
if (space > 0) {
|
586 |
|
|
/* allocate temporary buffer for atomic operation */
|
587 |
|
|
dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
|
588 |
|
|
if (dst == NULL)
|
589 |
|
|
return -ENOMEM;
|
590 |
|
|
down_read(&card->controls_rwsem);
|
591 |
|
|
list.count = card->controls_count;
|
592 |
|
|
plist = card->controls.next;
|
593 |
|
|
while (plist != &card->controls) {
|
594 |
|
|
if (offset == 0)
|
595 |
|
|
break;
|
596 |
|
|
kctl = snd_kcontrol(plist);
|
597 |
|
|
if (offset < kctl->count)
|
598 |
|
|
break;
|
599 |
|
|
offset -= kctl->count;
|
600 |
|
|
plist = plist->next;
|
601 |
|
|
}
|
602 |
|
|
list.used = 0;
|
603 |
|
|
id = dst;
|
604 |
|
|
while (space > 0 && plist != &card->controls) {
|
605 |
|
|
kctl = snd_kcontrol(plist);
|
606 |
|
|
for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
|
607 |
|
|
snd_ctl_build_ioff(id, kctl, jidx);
|
608 |
|
|
id++;
|
609 |
|
|
space--;
|
610 |
|
|
list.used++;
|
611 |
|
|
}
|
612 |
|
|
plist = plist->next;
|
613 |
|
|
offset = 0;
|
614 |
|
|
}
|
615 |
|
|
up_read(&card->controls_rwsem);
|
616 |
|
|
if (list.used > 0 &&
|
617 |
|
|
copy_to_user(list.pids, dst,
|
618 |
|
|
list.used * sizeof(struct snd_ctl_elem_id))) {
|
619 |
|
|
vfree(dst);
|
620 |
|
|
return -EFAULT;
|
621 |
|
|
}
|
622 |
|
|
vfree(dst);
|
623 |
|
|
} else {
|
624 |
|
|
down_read(&card->controls_rwsem);
|
625 |
|
|
list.count = card->controls_count;
|
626 |
|
|
up_read(&card->controls_rwsem);
|
627 |
|
|
}
|
628 |
|
|
if (copy_to_user(_list, &list, sizeof(list)))
|
629 |
|
|
return -EFAULT;
|
630 |
|
|
return 0;
|
631 |
|
|
}
|
632 |
|
|
|
633 |
|
|
static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
|
634 |
|
|
struct snd_ctl_elem_info *info)
|
635 |
|
|
{
|
636 |
|
|
struct snd_card *card = ctl->card;
|
637 |
|
|
struct snd_kcontrol *kctl;
|
638 |
|
|
struct snd_kcontrol_volatile *vd;
|
639 |
|
|
unsigned int index_offset;
|
640 |
|
|
int result;
|
641 |
|
|
|
642 |
|
|
down_read(&card->controls_rwsem);
|
643 |
|
|
kctl = snd_ctl_find_id(card, &info->id);
|
644 |
|
|
if (kctl == NULL) {
|
645 |
|
|
up_read(&card->controls_rwsem);
|
646 |
|
|
return -ENOENT;
|
647 |
|
|
}
|
648 |
|
|
#ifdef CONFIG_SND_DEBUG
|
649 |
|
|
info->access = 0;
|
650 |
|
|
#endif
|
651 |
|
|
result = kctl->info(kctl, info);
|
652 |
|
|
if (result >= 0) {
|
653 |
|
|
snd_assert(info->access == 0, );
|
654 |
|
|
index_offset = snd_ctl_get_ioff(kctl, &info->id);
|
655 |
|
|
vd = &kctl->vd[index_offset];
|
656 |
|
|
snd_ctl_build_ioff(&info->id, kctl, index_offset);
|
657 |
|
|
info->access = vd->access;
|
658 |
|
|
if (vd->owner) {
|
659 |
|
|
info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
|
660 |
|
|
if (vd->owner == ctl)
|
661 |
|
|
info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
|
662 |
|
|
info->owner = vd->owner_pid;
|
663 |
|
|
} else {
|
664 |
|
|
info->owner = -1;
|
665 |
|
|
}
|
666 |
|
|
}
|
667 |
|
|
up_read(&card->controls_rwsem);
|
668 |
|
|
return result;
|
669 |
|
|
}
|
670 |
|
|
|
671 |
|
|
static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
|
672 |
|
|
struct snd_ctl_elem_info __user *_info)
|
673 |
|
|
{
|
674 |
|
|
struct snd_ctl_elem_info info;
|
675 |
|
|
int result;
|
676 |
|
|
|
677 |
|
|
if (copy_from_user(&info, _info, sizeof(info)))
|
678 |
|
|
return -EFAULT;
|
679 |
|
|
snd_power_lock(ctl->card);
|
680 |
|
|
result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
|
681 |
|
|
if (result >= 0)
|
682 |
|
|
result = snd_ctl_elem_info(ctl, &info);
|
683 |
|
|
snd_power_unlock(ctl->card);
|
684 |
|
|
if (result >= 0)
|
685 |
|
|
if (copy_to_user(_info, &info, sizeof(info)))
|
686 |
|
|
return -EFAULT;
|
687 |
|
|
return result;
|
688 |
|
|
}
|
689 |
|
|
|
690 |
|
|
int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control)
|
691 |
|
|
{
|
692 |
|
|
struct snd_kcontrol *kctl;
|
693 |
|
|
struct snd_kcontrol_volatile *vd;
|
694 |
|
|
unsigned int index_offset;
|
695 |
|
|
int result, indirect;
|
696 |
|
|
|
697 |
|
|
down_read(&card->controls_rwsem);
|
698 |
|
|
kctl = snd_ctl_find_id(card, &control->id);
|
699 |
|
|
if (kctl == NULL) {
|
700 |
|
|
result = -ENOENT;
|
701 |
|
|
} else {
|
702 |
|
|
index_offset = snd_ctl_get_ioff(kctl, &control->id);
|
703 |
|
|
vd = &kctl->vd[index_offset];
|
704 |
|
|
indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0;
|
705 |
|
|
if (control->indirect != indirect) {
|
706 |
|
|
result = -EACCES;
|
707 |
|
|
} else {
|
708 |
|
|
if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) {
|
709 |
|
|
snd_ctl_build_ioff(&control->id, kctl, index_offset);
|
710 |
|
|
result = kctl->get(kctl, control);
|
711 |
|
|
} else {
|
712 |
|
|
result = -EPERM;
|
713 |
|
|
}
|
714 |
|
|
}
|
715 |
|
|
}
|
716 |
|
|
up_read(&card->controls_rwsem);
|
717 |
|
|
return result;
|
718 |
|
|
}
|
719 |
|
|
|
720 |
|
|
static int snd_ctl_elem_read_user(struct snd_card *card,
|
721 |
|
|
struct snd_ctl_elem_value __user *_control)
|
722 |
|
|
{
|
723 |
|
|
struct snd_ctl_elem_value *control;
|
724 |
|
|
int result;
|
725 |
|
|
|
726 |
|
|
control = kmalloc(sizeof(*control), GFP_KERNEL);
|
727 |
|
|
if (control == NULL)
|
728 |
|
|
return -ENOMEM;
|
729 |
|
|
if (copy_from_user(control, _control, sizeof(*control))) {
|
730 |
|
|
kfree(control);
|
731 |
|
|
return -EFAULT;
|
732 |
|
|
}
|
733 |
|
|
snd_power_lock(card);
|
734 |
|
|
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
|
735 |
|
|
if (result >= 0)
|
736 |
|
|
result = snd_ctl_elem_read(card, control);
|
737 |
|
|
snd_power_unlock(card);
|
738 |
|
|
if (result >= 0)
|
739 |
|
|
if (copy_to_user(_control, control, sizeof(*control)))
|
740 |
|
|
result = -EFAULT;
|
741 |
|
|
kfree(control);
|
742 |
|
|
return result;
|
743 |
|
|
}
|
744 |
|
|
|
745 |
|
|
int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
|
746 |
|
|
struct snd_ctl_elem_value *control)
|
747 |
|
|
{
|
748 |
|
|
struct snd_kcontrol *kctl;
|
749 |
|
|
struct snd_kcontrol_volatile *vd;
|
750 |
|
|
unsigned int index_offset;
|
751 |
|
|
int result, indirect;
|
752 |
|
|
|
753 |
|
|
down_read(&card->controls_rwsem);
|
754 |
|
|
kctl = snd_ctl_find_id(card, &control->id);
|
755 |
|
|
if (kctl == NULL) {
|
756 |
|
|
result = -ENOENT;
|
757 |
|
|
} else {
|
758 |
|
|
index_offset = snd_ctl_get_ioff(kctl, &control->id);
|
759 |
|
|
vd = &kctl->vd[index_offset];
|
760 |
|
|
indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0;
|
761 |
|
|
if (control->indirect != indirect) {
|
762 |
|
|
result = -EACCES;
|
763 |
|
|
} else {
|
764 |
|
|
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
|
765 |
|
|
kctl->put == NULL ||
|
766 |
|
|
(file && vd->owner != NULL && vd->owner != file)) {
|
767 |
|
|
result = -EPERM;
|
768 |
|
|
} else {
|
769 |
|
|
snd_ctl_build_ioff(&control->id, kctl, index_offset);
|
770 |
|
|
result = kctl->put(kctl, control);
|
771 |
|
|
}
|
772 |
|
|
if (result > 0) {
|
773 |
|
|
up_read(&card->controls_rwsem);
|
774 |
|
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &control->id);
|
775 |
|
|
return 0;
|
776 |
|
|
}
|
777 |
|
|
}
|
778 |
|
|
}
|
779 |
|
|
up_read(&card->controls_rwsem);
|
780 |
|
|
return result;
|
781 |
|
|
}
|
782 |
|
|
|
783 |
|
|
static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
|
784 |
|
|
struct snd_ctl_elem_value __user *_control)
|
785 |
|
|
{
|
786 |
|
|
struct snd_ctl_elem_value *control;
|
787 |
|
|
struct snd_card *card;
|
788 |
|
|
int result;
|
789 |
|
|
|
790 |
|
|
control = kmalloc(sizeof(*control), GFP_KERNEL);
|
791 |
|
|
if (control == NULL)
|
792 |
|
|
return -ENOMEM;
|
793 |
|
|
if (copy_from_user(control, _control, sizeof(*control))) {
|
794 |
|
|
kfree(control);
|
795 |
|
|
return -EFAULT;
|
796 |
|
|
}
|
797 |
|
|
card = file->card;
|
798 |
|
|
snd_power_lock(card);
|
799 |
|
|
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
|
800 |
|
|
if (result >= 0)
|
801 |
|
|
result = snd_ctl_elem_write(card, file, control);
|
802 |
|
|
snd_power_unlock(card);
|
803 |
|
|
if (result >= 0)
|
804 |
|
|
if (copy_to_user(_control, control, sizeof(*control)))
|
805 |
|
|
result = -EFAULT;
|
806 |
|
|
kfree(control);
|
807 |
|
|
return result;
|
808 |
|
|
}
|
809 |
|
|
|
810 |
|
|
static int snd_ctl_elem_lock(struct snd_ctl_file *file,
|
811 |
|
|
struct snd_ctl_elem_id __user *_id)
|
812 |
|
|
{
|
813 |
|
|
struct snd_card *card = file->card;
|
814 |
|
|
struct snd_ctl_elem_id id;
|
815 |
|
|
struct snd_kcontrol *kctl;
|
816 |
|
|
struct snd_kcontrol_volatile *vd;
|
817 |
|
|
int result;
|
818 |
|
|
|
819 |
|
|
if (copy_from_user(&id, _id, sizeof(id)))
|
820 |
|
|
return -EFAULT;
|
821 |
|
|
down_write(&card->controls_rwsem);
|
822 |
|
|
kctl = snd_ctl_find_id(card, &id);
|
823 |
|
|
if (kctl == NULL) {
|
824 |
|
|
result = -ENOENT;
|
825 |
|
|
} else {
|
826 |
|
|
vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
|
827 |
|
|
if (vd->owner != NULL)
|
828 |
|
|
result = -EBUSY;
|
829 |
|
|
else {
|
830 |
|
|
vd->owner = file;
|
831 |
|
|
vd->owner_pid = current->pid;
|
832 |
|
|
result = 0;
|
833 |
|
|
}
|
834 |
|
|
}
|
835 |
|
|
up_write(&card->controls_rwsem);
|
836 |
|
|
return result;
|
837 |
|
|
}
|
838 |
|
|
|
839 |
|
|
static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
|
840 |
|
|
struct snd_ctl_elem_id __user *_id)
|
841 |
|
|
{
|
842 |
|
|
struct snd_card *card = file->card;
|
843 |
|
|
struct snd_ctl_elem_id id;
|
844 |
|
|
struct snd_kcontrol *kctl;
|
845 |
|
|
struct snd_kcontrol_volatile *vd;
|
846 |
|
|
int result;
|
847 |
|
|
|
848 |
|
|
if (copy_from_user(&id, _id, sizeof(id)))
|
849 |
|
|
return -EFAULT;
|
850 |
|
|
down_write(&card->controls_rwsem);
|
851 |
|
|
kctl = snd_ctl_find_id(card, &id);
|
852 |
|
|
if (kctl == NULL) {
|
853 |
|
|
result = -ENOENT;
|
854 |
|
|
} else {
|
855 |
|
|
vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
|
856 |
|
|
if (vd->owner == NULL)
|
857 |
|
|
result = -EINVAL;
|
858 |
|
|
else if (vd->owner != file)
|
859 |
|
|
result = -EPERM;
|
860 |
|
|
else {
|
861 |
|
|
vd->owner = NULL;
|
862 |
|
|
vd->owner_pid = 0;
|
863 |
|
|
result = 0;
|
864 |
|
|
}
|
865 |
|
|
}
|
866 |
|
|
up_write(&card->controls_rwsem);
|
867 |
|
|
return result;
|
868 |
|
|
}
|
869 |
|
|
|
870 |
|
|
struct user_element {
|
871 |
|
|
struct snd_ctl_elem_info info;
|
872 |
|
|
void *elem_data; /* element data */
|
873 |
|
|
unsigned long elem_data_size; /* size of element data in bytes */
|
874 |
|
|
void *tlv_data; /* TLV data */
|
875 |
|
|
unsigned long tlv_data_size; /* TLV data size */
|
876 |
|
|
void *priv_data; /* private data (like strings for enumerated type) */
|
877 |
|
|
unsigned long priv_data_size; /* size of private data in bytes */
|
878 |
|
|
};
|
879 |
|
|
|
880 |
|
|
static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
|
881 |
|
|
struct snd_ctl_elem_info *uinfo)
|
882 |
|
|
{
|
883 |
|
|
struct user_element *ue = kcontrol->private_data;
|
884 |
|
|
|
885 |
|
|
*uinfo = ue->info;
|
886 |
|
|
return 0;
|
887 |
|
|
}
|
888 |
|
|
|
889 |
|
|
static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
|
890 |
|
|
struct snd_ctl_elem_value *ucontrol)
|
891 |
|
|
{
|
892 |
|
|
struct user_element *ue = kcontrol->private_data;
|
893 |
|
|
|
894 |
|
|
memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
|
895 |
|
|
return 0;
|
896 |
|
|
}
|
897 |
|
|
|
898 |
|
|
static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
|
899 |
|
|
struct snd_ctl_elem_value *ucontrol)
|
900 |
|
|
{
|
901 |
|
|
int change;
|
902 |
|
|
struct user_element *ue = kcontrol->private_data;
|
903 |
|
|
|
904 |
|
|
change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
|
905 |
|
|
if (change)
|
906 |
|
|
memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
|
907 |
|
|
return change;
|
908 |
|
|
}
|
909 |
|
|
|
910 |
|
|
static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
|
911 |
|
|
int op_flag,
|
912 |
|
|
unsigned int size,
|
913 |
|
|
unsigned int __user *tlv)
|
914 |
|
|
{
|
915 |
|
|
struct user_element *ue = kcontrol->private_data;
|
916 |
|
|
int change = 0;
|
917 |
|
|
void *new_data;
|
918 |
|
|
|
919 |
|
|
if (op_flag > 0) {
|
920 |
|
|
if (size > 1024 * 128) /* sane value */
|
921 |
|
|
return -EINVAL;
|
922 |
|
|
new_data = kmalloc(size, GFP_KERNEL);
|
923 |
|
|
if (new_data == NULL)
|
924 |
|
|
return -ENOMEM;
|
925 |
|
|
if (copy_from_user(new_data, tlv, size)) {
|
926 |
|
|
kfree(new_data);
|
927 |
|
|
return -EFAULT;
|
928 |
|
|
}
|
929 |
|
|
change = ue->tlv_data_size != size;
|
930 |
|
|
if (!change)
|
931 |
|
|
change = memcmp(ue->tlv_data, new_data, size);
|
932 |
|
|
kfree(ue->tlv_data);
|
933 |
|
|
ue->tlv_data = new_data;
|
934 |
|
|
ue->tlv_data_size = size;
|
935 |
|
|
} else {
|
936 |
|
|
if (! ue->tlv_data_size || ! ue->tlv_data)
|
937 |
|
|
return -ENXIO;
|
938 |
|
|
if (size < ue->tlv_data_size)
|
939 |
|
|
return -ENOSPC;
|
940 |
|
|
if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
|
941 |
|
|
return -EFAULT;
|
942 |
|
|
}
|
943 |
|
|
return change;
|
944 |
|
|
}
|
945 |
|
|
|
946 |
|
|
static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
|
947 |
|
|
{
|
948 |
|
|
struct user_element *ue = kcontrol->private_data;
|
949 |
|
|
if (ue->tlv_data)
|
950 |
|
|
kfree(ue->tlv_data);
|
951 |
|
|
kfree(ue);
|
952 |
|
|
}
|
953 |
|
|
|
954 |
|
|
static int snd_ctl_elem_add(struct snd_ctl_file *file,
|
955 |
|
|
struct snd_ctl_elem_info *info, int replace)
|
956 |
|
|
{
|
957 |
|
|
struct snd_card *card = file->card;
|
958 |
|
|
struct snd_kcontrol kctl, *_kctl;
|
959 |
|
|
unsigned int access;
|
960 |
|
|
long private_size;
|
961 |
|
|
struct user_element *ue;
|
962 |
|
|
int idx, err;
|
963 |
|
|
|
964 |
|
|
if (card->user_ctl_count >= MAX_USER_CONTROLS)
|
965 |
|
|
return -ENOMEM;
|
966 |
|
|
if (info->count > 1024)
|
967 |
|
|
return -EINVAL;
|
968 |
|
|
access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
|
969 |
|
|
(info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
|
970 |
|
|
SNDRV_CTL_ELEM_ACCESS_INACTIVE|
|
971 |
|
|
SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
|
972 |
|
|
info->id.numid = 0;
|
973 |
|
|
memset(&kctl, 0, sizeof(kctl));
|
974 |
|
|
down_write(&card->controls_rwsem);
|
975 |
|
|
_kctl = snd_ctl_find_id(card, &info->id);
|
976 |
|
|
err = 0;
|
977 |
|
|
if (_kctl) {
|
978 |
|
|
if (replace)
|
979 |
|
|
err = snd_ctl_remove(card, _kctl);
|
980 |
|
|
else
|
981 |
|
|
err = -EBUSY;
|
982 |
|
|
} else {
|
983 |
|
|
if (replace)
|
984 |
|
|
err = -ENOENT;
|
985 |
|
|
}
|
986 |
|
|
up_write(&card->controls_rwsem);
|
987 |
|
|
if (err < 0)
|
988 |
|
|
return err;
|
989 |
|
|
memcpy(&kctl.id, &info->id, sizeof(info->id));
|
990 |
|
|
kctl.count = info->owner ? info->owner : 1;
|
991 |
|
|
access |= SNDRV_CTL_ELEM_ACCESS_USER;
|
992 |
|
|
kctl.info = snd_ctl_elem_user_info;
|
993 |
|
|
if (access & SNDRV_CTL_ELEM_ACCESS_READ)
|
994 |
|
|
kctl.get = snd_ctl_elem_user_get;
|
995 |
|
|
if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
|
996 |
|
|
kctl.put = snd_ctl_elem_user_put;
|
997 |
|
|
if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
|
998 |
|
|
kctl.tlv.c = snd_ctl_elem_user_tlv;
|
999 |
|
|
access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
|
1000 |
|
|
}
|
1001 |
|
|
switch (info->type) {
|
1002 |
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
1003 |
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER:
|
1004 |
|
|
private_size = sizeof(long);
|
1005 |
|
|
if (info->count > 128)
|
1006 |
|
|
return -EINVAL;
|
1007 |
|
|
break;
|
1008 |
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
|
1009 |
|
|
private_size = sizeof(long long);
|
1010 |
|
|
if (info->count > 64)
|
1011 |
|
|
return -EINVAL;
|
1012 |
|
|
break;
|
1013 |
|
|
case SNDRV_CTL_ELEM_TYPE_BYTES:
|
1014 |
|
|
private_size = sizeof(unsigned char);
|
1015 |
|
|
if (info->count > 512)
|
1016 |
|
|
return -EINVAL;
|
1017 |
|
|
break;
|
1018 |
|
|
case SNDRV_CTL_ELEM_TYPE_IEC958:
|
1019 |
|
|
private_size = sizeof(struct snd_aes_iec958);
|
1020 |
|
|
if (info->count != 1)
|
1021 |
|
|
return -EINVAL;
|
1022 |
|
|
break;
|
1023 |
|
|
default:
|
1024 |
|
|
return -EINVAL;
|
1025 |
|
|
}
|
1026 |
|
|
private_size *= info->count;
|
1027 |
|
|
ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
|
1028 |
|
|
if (ue == NULL)
|
1029 |
|
|
return -ENOMEM;
|
1030 |
|
|
ue->info = *info;
|
1031 |
|
|
ue->info.access = 0;
|
1032 |
|
|
ue->elem_data = (char *)ue + sizeof(*ue);
|
1033 |
|
|
ue->elem_data_size = private_size;
|
1034 |
|
|
kctl.private_free = snd_ctl_elem_user_free;
|
1035 |
|
|
_kctl = snd_ctl_new(&kctl, access);
|
1036 |
|
|
if (_kctl == NULL) {
|
1037 |
|
|
kfree(ue);
|
1038 |
|
|
return -ENOMEM;
|
1039 |
|
|
}
|
1040 |
|
|
_kctl->private_data = ue;
|
1041 |
|
|
for (idx = 0; idx < _kctl->count; idx++)
|
1042 |
|
|
_kctl->vd[idx].owner = file;
|
1043 |
|
|
err = snd_ctl_add(card, _kctl);
|
1044 |
|
|
if (err < 0)
|
1045 |
|
|
return err;
|
1046 |
|
|
|
1047 |
|
|
down_write(&card->controls_rwsem);
|
1048 |
|
|
card->user_ctl_count++;
|
1049 |
|
|
up_write(&card->controls_rwsem);
|
1050 |
|
|
|
1051 |
|
|
return 0;
|
1052 |
|
|
}
|
1053 |
|
|
|
1054 |
|
|
static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
|
1055 |
|
|
struct snd_ctl_elem_info __user *_info, int replace)
|
1056 |
|
|
{
|
1057 |
|
|
struct snd_ctl_elem_info info;
|
1058 |
|
|
if (copy_from_user(&info, _info, sizeof(info)))
|
1059 |
|
|
return -EFAULT;
|
1060 |
|
|
return snd_ctl_elem_add(file, &info, replace);
|
1061 |
|
|
}
|
1062 |
|
|
|
1063 |
|
|
static int snd_ctl_elem_remove(struct snd_ctl_file *file,
|
1064 |
|
|
struct snd_ctl_elem_id __user *_id)
|
1065 |
|
|
{
|
1066 |
|
|
struct snd_ctl_elem_id id;
|
1067 |
|
|
int err;
|
1068 |
|
|
|
1069 |
|
|
if (copy_from_user(&id, _id, sizeof(id)))
|
1070 |
|
|
return -EFAULT;
|
1071 |
|
|
err = snd_ctl_remove_unlocked_id(file, &id);
|
1072 |
|
|
if (! err) {
|
1073 |
|
|
struct snd_card *card = file->card;
|
1074 |
|
|
down_write(&card->controls_rwsem);
|
1075 |
|
|
card->user_ctl_count--;
|
1076 |
|
|
up_write(&card->controls_rwsem);
|
1077 |
|
|
}
|
1078 |
|
|
return err;
|
1079 |
|
|
}
|
1080 |
|
|
|
1081 |
|
|
static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
|
1082 |
|
|
{
|
1083 |
|
|
int subscribe;
|
1084 |
|
|
if (get_user(subscribe, ptr))
|
1085 |
|
|
return -EFAULT;
|
1086 |
|
|
if (subscribe < 0) {
|
1087 |
|
|
subscribe = file->subscribed;
|
1088 |
|
|
if (put_user(subscribe, ptr))
|
1089 |
|
|
return -EFAULT;
|
1090 |
|
|
return 0;
|
1091 |
|
|
}
|
1092 |
|
|
if (subscribe) {
|
1093 |
|
|
file->subscribed = 1;
|
1094 |
|
|
return 0;
|
1095 |
|
|
} else if (file->subscribed) {
|
1096 |
|
|
snd_ctl_empty_read_queue(file);
|
1097 |
|
|
file->subscribed = 0;
|
1098 |
|
|
}
|
1099 |
|
|
return 0;
|
1100 |
|
|
}
|
1101 |
|
|
|
1102 |
|
|
static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
|
1103 |
|
|
struct snd_ctl_tlv __user *_tlv,
|
1104 |
|
|
int op_flag)
|
1105 |
|
|
{
|
1106 |
|
|
struct snd_card *card = file->card;
|
1107 |
|
|
struct snd_ctl_tlv tlv;
|
1108 |
|
|
struct snd_kcontrol *kctl;
|
1109 |
|
|
struct snd_kcontrol_volatile *vd;
|
1110 |
|
|
unsigned int len;
|
1111 |
|
|
int err = 0;
|
1112 |
|
|
|
1113 |
|
|
if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
|
1114 |
|
|
return -EFAULT;
|
1115 |
|
|
if (tlv.length < sizeof(unsigned int) * 3)
|
1116 |
|
|
return -EINVAL;
|
1117 |
|
|
down_read(&card->controls_rwsem);
|
1118 |
|
|
kctl = snd_ctl_find_numid(card, tlv.numid);
|
1119 |
|
|
if (kctl == NULL) {
|
1120 |
|
|
err = -ENOENT;
|
1121 |
|
|
goto __kctl_end;
|
1122 |
|
|
}
|
1123 |
|
|
if (kctl->tlv.p == NULL) {
|
1124 |
|
|
err = -ENXIO;
|
1125 |
|
|
goto __kctl_end;
|
1126 |
|
|
}
|
1127 |
|
|
vd = &kctl->vd[tlv.numid - kctl->id.numid];
|
1128 |
|
|
if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
|
1129 |
|
|
(op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
|
1130 |
|
|
(op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
|
1131 |
|
|
err = -ENXIO;
|
1132 |
|
|
goto __kctl_end;
|
1133 |
|
|
}
|
1134 |
|
|
if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
|
1135 |
|
|
if (file && vd->owner != NULL && vd->owner != file) {
|
1136 |
|
|
err = -EPERM;
|
1137 |
|
|
goto __kctl_end;
|
1138 |
|
|
}
|
1139 |
|
|
err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
|
1140 |
|
|
if (err > 0) {
|
1141 |
|
|
up_read(&card->controls_rwsem);
|
1142 |
|
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
|
1143 |
|
|
return 0;
|
1144 |
|
|
}
|
1145 |
|
|
} else {
|
1146 |
|
|
if (op_flag) {
|
1147 |
|
|
err = -ENXIO;
|
1148 |
|
|
goto __kctl_end;
|
1149 |
|
|
}
|
1150 |
|
|
len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
|
1151 |
|
|
if (tlv.length < len) {
|
1152 |
|
|
err = -ENOMEM;
|
1153 |
|
|
goto __kctl_end;
|
1154 |
|
|
}
|
1155 |
|
|
if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
|
1156 |
|
|
err = -EFAULT;
|
1157 |
|
|
}
|
1158 |
|
|
__kctl_end:
|
1159 |
|
|
up_read(&card->controls_rwsem);
|
1160 |
|
|
return err;
|
1161 |
|
|
}
|
1162 |
|
|
|
1163 |
|
|
static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
1164 |
|
|
{
|
1165 |
|
|
struct snd_ctl_file *ctl;
|
1166 |
|
|
struct snd_card *card;
|
1167 |
|
|
struct snd_kctl_ioctl *p;
|
1168 |
|
|
void __user *argp = (void __user *)arg;
|
1169 |
|
|
int __user *ip = argp;
|
1170 |
|
|
int err;
|
1171 |
|
|
|
1172 |
|
|
ctl = file->private_data;
|
1173 |
|
|
card = ctl->card;
|
1174 |
|
|
snd_assert(card != NULL, return -ENXIO);
|
1175 |
|
|
switch (cmd) {
|
1176 |
|
|
case SNDRV_CTL_IOCTL_PVERSION:
|
1177 |
|
|
return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
|
1178 |
|
|
case SNDRV_CTL_IOCTL_CARD_INFO:
|
1179 |
|
|
return snd_ctl_card_info(card, ctl, cmd, argp);
|
1180 |
|
|
case SNDRV_CTL_IOCTL_ELEM_LIST:
|
1181 |
|
|
return snd_ctl_elem_list(card, argp);
|
1182 |
|
|
case SNDRV_CTL_IOCTL_ELEM_INFO:
|
1183 |
|
|
return snd_ctl_elem_info_user(ctl, argp);
|
1184 |
|
|
case SNDRV_CTL_IOCTL_ELEM_READ:
|
1185 |
|
|
return snd_ctl_elem_read_user(card, argp);
|
1186 |
|
|
case SNDRV_CTL_IOCTL_ELEM_WRITE:
|
1187 |
|
|
return snd_ctl_elem_write_user(ctl, argp);
|
1188 |
|
|
case SNDRV_CTL_IOCTL_ELEM_LOCK:
|
1189 |
|
|
return snd_ctl_elem_lock(ctl, argp);
|
1190 |
|
|
case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
|
1191 |
|
|
return snd_ctl_elem_unlock(ctl, argp);
|
1192 |
|
|
case SNDRV_CTL_IOCTL_ELEM_ADD:
|
1193 |
|
|
return snd_ctl_elem_add_user(ctl, argp, 0);
|
1194 |
|
|
case SNDRV_CTL_IOCTL_ELEM_REPLACE:
|
1195 |
|
|
return snd_ctl_elem_add_user(ctl, argp, 1);
|
1196 |
|
|
case SNDRV_CTL_IOCTL_ELEM_REMOVE:
|
1197 |
|
|
return snd_ctl_elem_remove(ctl, argp);
|
1198 |
|
|
case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
|
1199 |
|
|
return snd_ctl_subscribe_events(ctl, ip);
|
1200 |
|
|
case SNDRV_CTL_IOCTL_TLV_READ:
|
1201 |
|
|
return snd_ctl_tlv_ioctl(ctl, argp, 0);
|
1202 |
|
|
case SNDRV_CTL_IOCTL_TLV_WRITE:
|
1203 |
|
|
return snd_ctl_tlv_ioctl(ctl, argp, 1);
|
1204 |
|
|
case SNDRV_CTL_IOCTL_TLV_COMMAND:
|
1205 |
|
|
return snd_ctl_tlv_ioctl(ctl, argp, -1);
|
1206 |
|
|
case SNDRV_CTL_IOCTL_POWER:
|
1207 |
|
|
return -ENOPROTOOPT;
|
1208 |
|
|
case SNDRV_CTL_IOCTL_POWER_STATE:
|
1209 |
|
|
#ifdef CONFIG_PM
|
1210 |
|
|
return put_user(card->power_state, ip) ? -EFAULT : 0;
|
1211 |
|
|
#else
|
1212 |
|
|
return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
|
1213 |
|
|
#endif
|
1214 |
|
|
}
|
1215 |
|
|
down_read(&snd_ioctl_rwsem);
|
1216 |
|
|
list_for_each_entry(p, &snd_control_ioctls, list) {
|
1217 |
|
|
err = p->fioctl(card, ctl, cmd, arg);
|
1218 |
|
|
if (err != -ENOIOCTLCMD) {
|
1219 |
|
|
up_read(&snd_ioctl_rwsem);
|
1220 |
|
|
return err;
|
1221 |
|
|
}
|
1222 |
|
|
}
|
1223 |
|
|
up_read(&snd_ioctl_rwsem);
|
1224 |
|
|
snd_printdd("unknown ioctl = 0x%x\n", cmd);
|
1225 |
|
|
return -ENOTTY;
|
1226 |
|
|
}
|
1227 |
|
|
|
1228 |
|
|
static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
|
1229 |
|
|
size_t count, loff_t * offset)
|
1230 |
|
|
{
|
1231 |
|
|
struct snd_ctl_file *ctl;
|
1232 |
|
|
int err = 0;
|
1233 |
|
|
ssize_t result = 0;
|
1234 |
|
|
|
1235 |
|
|
ctl = file->private_data;
|
1236 |
|
|
snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO);
|
1237 |
|
|
if (!ctl->subscribed)
|
1238 |
|
|
return -EBADFD;
|
1239 |
|
|
if (count < sizeof(struct snd_ctl_event))
|
1240 |
|
|
return -EINVAL;
|
1241 |
|
|
spin_lock_irq(&ctl->read_lock);
|
1242 |
|
|
while (count >= sizeof(struct snd_ctl_event)) {
|
1243 |
|
|
struct snd_ctl_event ev;
|
1244 |
|
|
struct snd_kctl_event *kev;
|
1245 |
|
|
while (list_empty(&ctl->events)) {
|
1246 |
|
|
wait_queue_t wait;
|
1247 |
|
|
if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
|
1248 |
|
|
err = -EAGAIN;
|
1249 |
|
|
goto __end_lock;
|
1250 |
|
|
}
|
1251 |
|
|
init_waitqueue_entry(&wait, current);
|
1252 |
|
|
add_wait_queue(&ctl->change_sleep, &wait);
|
1253 |
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
1254 |
|
|
spin_unlock_irq(&ctl->read_lock);
|
1255 |
|
|
schedule();
|
1256 |
|
|
remove_wait_queue(&ctl->change_sleep, &wait);
|
1257 |
|
|
if (signal_pending(current))
|
1258 |
|
|
return -ERESTARTSYS;
|
1259 |
|
|
spin_lock_irq(&ctl->read_lock);
|
1260 |
|
|
}
|
1261 |
|
|
kev = snd_kctl_event(ctl->events.next);
|
1262 |
|
|
ev.type = SNDRV_CTL_EVENT_ELEM;
|
1263 |
|
|
ev.data.elem.mask = kev->mask;
|
1264 |
|
|
ev.data.elem.id = kev->id;
|
1265 |
|
|
list_del(&kev->list);
|
1266 |
|
|
spin_unlock_irq(&ctl->read_lock);
|
1267 |
|
|
kfree(kev);
|
1268 |
|
|
if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
|
1269 |
|
|
err = -EFAULT;
|
1270 |
|
|
goto __end;
|
1271 |
|
|
}
|
1272 |
|
|
spin_lock_irq(&ctl->read_lock);
|
1273 |
|
|
buffer += sizeof(struct snd_ctl_event);
|
1274 |
|
|
count -= sizeof(struct snd_ctl_event);
|
1275 |
|
|
result += sizeof(struct snd_ctl_event);
|
1276 |
|
|
}
|
1277 |
|
|
__end_lock:
|
1278 |
|
|
spin_unlock_irq(&ctl->read_lock);
|
1279 |
|
|
__end:
|
1280 |
|
|
return result > 0 ? result : err;
|
1281 |
|
|
}
|
1282 |
|
|
|
1283 |
|
|
static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
|
1284 |
|
|
{
|
1285 |
|
|
unsigned int mask;
|
1286 |
|
|
struct snd_ctl_file *ctl;
|
1287 |
|
|
|
1288 |
|
|
ctl = file->private_data;
|
1289 |
|
|
if (!ctl->subscribed)
|
1290 |
|
|
return 0;
|
1291 |
|
|
poll_wait(file, &ctl->change_sleep, wait);
|
1292 |
|
|
|
1293 |
|
|
mask = 0;
|
1294 |
|
|
if (!list_empty(&ctl->events))
|
1295 |
|
|
mask |= POLLIN | POLLRDNORM;
|
1296 |
|
|
|
1297 |
|
|
return mask;
|
1298 |
|
|
}
|
1299 |
|
|
|
1300 |
|
|
/*
|
1301 |
|
|
* register the device-specific control-ioctls.
|
1302 |
|
|
* called from each device manager like pcm.c, hwdep.c, etc.
|
1303 |
|
|
*/
|
1304 |
|
|
static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
|
1305 |
|
|
{
|
1306 |
|
|
struct snd_kctl_ioctl *pn;
|
1307 |
|
|
|
1308 |
|
|
pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
|
1309 |
|
|
if (pn == NULL)
|
1310 |
|
|
return -ENOMEM;
|
1311 |
|
|
pn->fioctl = fcn;
|
1312 |
|
|
down_write(&snd_ioctl_rwsem);
|
1313 |
|
|
list_add_tail(&pn->list, lists);
|
1314 |
|
|
up_write(&snd_ioctl_rwsem);
|
1315 |
|
|
return 0;
|
1316 |
|
|
}
|
1317 |
|
|
|
1318 |
|
|
int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
|
1319 |
|
|
{
|
1320 |
|
|
return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
|
1321 |
|
|
}
|
1322 |
|
|
|
1323 |
|
|
EXPORT_SYMBOL(snd_ctl_register_ioctl);
|
1324 |
|
|
|
1325 |
|
|
#ifdef CONFIG_COMPAT
|
1326 |
|
|
int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
|
1327 |
|
|
{
|
1328 |
|
|
return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
|
1329 |
|
|
}
|
1330 |
|
|
|
1331 |
|
|
EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
|
1332 |
|
|
#endif
|
1333 |
|
|
|
1334 |
|
|
/*
|
1335 |
|
|
* de-register the device-specific control-ioctls.
|
1336 |
|
|
*/
|
1337 |
|
|
static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
|
1338 |
|
|
struct list_head *lists)
|
1339 |
|
|
{
|
1340 |
|
|
struct snd_kctl_ioctl *p;
|
1341 |
|
|
|
1342 |
|
|
snd_assert(fcn != NULL, return -EINVAL);
|
1343 |
|
|
down_write(&snd_ioctl_rwsem);
|
1344 |
|
|
list_for_each_entry(p, lists, list) {
|
1345 |
|
|
if (p->fioctl == fcn) {
|
1346 |
|
|
list_del(&p->list);
|
1347 |
|
|
up_write(&snd_ioctl_rwsem);
|
1348 |
|
|
kfree(p);
|
1349 |
|
|
return 0;
|
1350 |
|
|
}
|
1351 |
|
|
}
|
1352 |
|
|
up_write(&snd_ioctl_rwsem);
|
1353 |
|
|
snd_BUG();
|
1354 |
|
|
return -EINVAL;
|
1355 |
|
|
}
|
1356 |
|
|
|
1357 |
|
|
int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
|
1358 |
|
|
{
|
1359 |
|
|
return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
|
1360 |
|
|
}
|
1361 |
|
|
|
1362 |
|
|
EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
|
1363 |
|
|
|
1364 |
|
|
#ifdef CONFIG_COMPAT
|
1365 |
|
|
int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
|
1366 |
|
|
{
|
1367 |
|
|
return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
|
1368 |
|
|
}
|
1369 |
|
|
|
1370 |
|
|
EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
|
1371 |
|
|
#endif
|
1372 |
|
|
|
1373 |
|
|
static int snd_ctl_fasync(int fd, struct file * file, int on)
|
1374 |
|
|
{
|
1375 |
|
|
struct snd_ctl_file *ctl;
|
1376 |
|
|
int err;
|
1377 |
|
|
ctl = file->private_data;
|
1378 |
|
|
err = fasync_helper(fd, file, on, &ctl->fasync);
|
1379 |
|
|
if (err < 0)
|
1380 |
|
|
return err;
|
1381 |
|
|
return 0;
|
1382 |
|
|
}
|
1383 |
|
|
|
1384 |
|
|
/*
|
1385 |
|
|
* ioctl32 compat
|
1386 |
|
|
*/
|
1387 |
|
|
#ifdef CONFIG_COMPAT
|
1388 |
|
|
#include "control_compat.c"
|
1389 |
|
|
#else
|
1390 |
|
|
#define snd_ctl_ioctl_compat NULL
|
1391 |
|
|
#endif
|
1392 |
|
|
|
1393 |
|
|
/*
|
1394 |
|
|
* INIT PART
|
1395 |
|
|
*/
|
1396 |
|
|
|
1397 |
|
|
static const struct file_operations snd_ctl_f_ops =
|
1398 |
|
|
{
|
1399 |
|
|
.owner = THIS_MODULE,
|
1400 |
|
|
.read = snd_ctl_read,
|
1401 |
|
|
.open = snd_ctl_open,
|
1402 |
|
|
.release = snd_ctl_release,
|
1403 |
|
|
.poll = snd_ctl_poll,
|
1404 |
|
|
.unlocked_ioctl = snd_ctl_ioctl,
|
1405 |
|
|
.compat_ioctl = snd_ctl_ioctl_compat,
|
1406 |
|
|
.fasync = snd_ctl_fasync,
|
1407 |
|
|
};
|
1408 |
|
|
|
1409 |
|
|
/*
|
1410 |
|
|
* registration of the control device
|
1411 |
|
|
*/
|
1412 |
|
|
static int snd_ctl_dev_register(struct snd_device *device)
|
1413 |
|
|
{
|
1414 |
|
|
struct snd_card *card = device->device_data;
|
1415 |
|
|
int err, cardnum;
|
1416 |
|
|
char name[16];
|
1417 |
|
|
|
1418 |
|
|
snd_assert(card != NULL, return -ENXIO);
|
1419 |
|
|
cardnum = card->number;
|
1420 |
|
|
snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
|
1421 |
|
|
sprintf(name, "controlC%i", cardnum);
|
1422 |
|
|
if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
|
1423 |
|
|
&snd_ctl_f_ops, card, name)) < 0)
|
1424 |
|
|
return err;
|
1425 |
|
|
return 0;
|
1426 |
|
|
}
|
1427 |
|
|
|
1428 |
|
|
/*
|
1429 |
|
|
* disconnection of the control device
|
1430 |
|
|
*/
|
1431 |
|
|
static int snd_ctl_dev_disconnect(struct snd_device *device)
|
1432 |
|
|
{
|
1433 |
|
|
struct snd_card *card = device->device_data;
|
1434 |
|
|
struct snd_ctl_file *ctl;
|
1435 |
|
|
int err, cardnum;
|
1436 |
|
|
|
1437 |
|
|
snd_assert(card != NULL, return -ENXIO);
|
1438 |
|
|
cardnum = card->number;
|
1439 |
|
|
snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
|
1440 |
|
|
|
1441 |
|
|
down_read(&card->controls_rwsem);
|
1442 |
|
|
list_for_each_entry(ctl, &card->ctl_files, list) {
|
1443 |
|
|
wake_up(&ctl->change_sleep);
|
1444 |
|
|
kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
|
1445 |
|
|
}
|
1446 |
|
|
up_read(&card->controls_rwsem);
|
1447 |
|
|
|
1448 |
|
|
if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
|
1449 |
|
|
card, -1)) < 0)
|
1450 |
|
|
return err;
|
1451 |
|
|
return 0;
|
1452 |
|
|
}
|
1453 |
|
|
|
1454 |
|
|
/*
|
1455 |
|
|
* free all controls
|
1456 |
|
|
*/
|
1457 |
|
|
static int snd_ctl_dev_free(struct snd_device *device)
|
1458 |
|
|
{
|
1459 |
|
|
struct snd_card *card = device->device_data;
|
1460 |
|
|
struct snd_kcontrol *control;
|
1461 |
|
|
|
1462 |
|
|
down_write(&card->controls_rwsem);
|
1463 |
|
|
while (!list_empty(&card->controls)) {
|
1464 |
|
|
control = snd_kcontrol(card->controls.next);
|
1465 |
|
|
snd_ctl_remove(card, control);
|
1466 |
|
|
}
|
1467 |
|
|
up_write(&card->controls_rwsem);
|
1468 |
|
|
return 0;
|
1469 |
|
|
}
|
1470 |
|
|
|
1471 |
|
|
/*
|
1472 |
|
|
* create control core:
|
1473 |
|
|
* called from init.c
|
1474 |
|
|
*/
|
1475 |
|
|
int snd_ctl_create(struct snd_card *card)
|
1476 |
|
|
{
|
1477 |
|
|
static struct snd_device_ops ops = {
|
1478 |
|
|
.dev_free = snd_ctl_dev_free,
|
1479 |
|
|
.dev_register = snd_ctl_dev_register,
|
1480 |
|
|
.dev_disconnect = snd_ctl_dev_disconnect,
|
1481 |
|
|
};
|
1482 |
|
|
|
1483 |
|
|
snd_assert(card != NULL, return -ENXIO);
|
1484 |
|
|
return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
|
1485 |
|
|
}
|
1486 |
|
|
|
1487 |
|
|
/*
|
1488 |
|
|
* Frequently used control callbacks
|
1489 |
|
|
*/
|
1490 |
|
|
int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
|
1491 |
|
|
struct snd_ctl_elem_info *uinfo)
|
1492 |
|
|
{
|
1493 |
|
|
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
|
1494 |
|
|
uinfo->count = 1;
|
1495 |
|
|
uinfo->value.integer.min = 0;
|
1496 |
|
|
uinfo->value.integer.max = 1;
|
1497 |
|
|
return 0;
|
1498 |
|
|
}
|
1499 |
|
|
|
1500 |
|
|
EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
|
1501 |
|
|
|
1502 |
|
|
int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
|
1503 |
|
|
struct snd_ctl_elem_info *uinfo)
|
1504 |
|
|
{
|
1505 |
|
|
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
|
1506 |
|
|
uinfo->count = 2;
|
1507 |
|
|
uinfo->value.integer.min = 0;
|
1508 |
|
|
uinfo->value.integer.max = 1;
|
1509 |
|
|
return 0;
|
1510 |
|
|
}
|
1511 |
|
|
|
1512 |
|
|
EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
|