1 /* 2 * HWDEP Interface for HD-audio codec 3 * 4 * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de> 5 * 6 * This driver is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This driver is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 #include <linux/init.h> 22 #include <linux/slab.h> 23 #include <linux/compat.h> 24 #include <linux/nospec.h> 25 #include <sound/core.h> 26 #include <sound/hda_codec.h> 27 #include "hda_local.h" 28 #include <sound/hda_hwdep.h> 29 #include <sound/minors.h> 30 31 /* 32 * write/read an out-of-bound verb 33 */ 34 static int verb_write_ioctl(struct hda_codec *codec, 35 struct hda_verb_ioctl __user *arg) 36 { 37 u32 verb, res; 38 39 if (get_user(verb, &arg->verb)) 40 return -EFAULT; 41 res = snd_hda_codec_read(codec, verb >> 24, 0, 42 (verb >> 8) & 0xffff, verb & 0xff); 43 if (put_user(res, &arg->res)) 44 return -EFAULT; 45 return 0; 46 } 47 48 static int get_wcap_ioctl(struct hda_codec *codec, 49 struct hda_verb_ioctl __user *arg) 50 { 51 u32 verb, res; 52 53 if (get_user(verb, &arg->verb)) 54 return -EFAULT; 55 /* open-code get_wcaps(verb>>24) with nospec */ 56 verb >>= 24; 57 if (verb < codec->core.start_nid || 58 verb >= codec->core.start_nid + codec->core.num_nodes) { 59 res = 0; 60 } else { 61 verb -= codec->core.start_nid; 62 verb = array_index_nospec(verb, codec->core.num_nodes); 63 res = codec->wcaps[verb]; 64 } 65 if (put_user(res, &arg->res)) 66 return -EFAULT; 67 return 0; 68 } 69 70 71 /* 72 */ 73 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, 74 unsigned int cmd, unsigned long arg) 75 { 76 struct hda_codec *codec = hw->private_data; 77 void __user *argp = (void __user *)arg; 78 79 switch (cmd) { 80 case HDA_IOCTL_PVERSION: 81 return put_user(HDA_HWDEP_VERSION, (int __user *)argp); 82 case HDA_IOCTL_VERB_WRITE: 83 return verb_write_ioctl(codec, argp); 84 case HDA_IOCTL_GET_WCAP: 85 return get_wcap_ioctl(codec, argp); 86 } 87 return -ENOIOCTLCMD; 88 } 89 90 #ifdef CONFIG_COMPAT 91 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file, 92 unsigned int cmd, unsigned long arg) 93 { 94 return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg)); 95 } 96 #endif 97 98 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file) 99 { 100 #ifndef CONFIG_SND_DEBUG_VERBOSE 101 if (!capable(CAP_SYS_RAWIO)) 102 return -EACCES; 103 #endif 104 return 0; 105 } 106 107 int snd_hda_create_hwdep(struct hda_codec *codec) 108 { 109 char hwname[16]; 110 struct snd_hwdep *hwdep; 111 int err; 112 113 sprintf(hwname, "HDA Codec %d", codec->addr); 114 err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep); 115 if (err < 0) 116 return err; 117 codec->hwdep = hwdep; 118 sprintf(hwdep->name, "HDA Codec %d", codec->addr); 119 hwdep->iface = SNDRV_HWDEP_IFACE_HDA; 120 hwdep->private_data = codec; 121 hwdep->exclusive = 1; 122 123 hwdep->ops.open = hda_hwdep_open; 124 hwdep->ops.ioctl = hda_hwdep_ioctl; 125 #ifdef CONFIG_COMPAT 126 hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat; 127 #endif 128 129 /* for sysfs */ 130 hwdep->dev.groups = snd_hda_dev_attr_groups; 131 dev_set_drvdata(&hwdep->dev, codec); 132 133 return 0; 134 } 135