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 <sound/core.h> 25 #include "hda_codec.h" 26 #include "hda_local.h" 27 #include <sound/hda_hwdep.h> 28 #include <sound/minors.h> 29 30 /* 31 * write/read an out-of-bound verb 32 */ 33 static int verb_write_ioctl(struct hda_codec *codec, 34 struct hda_verb_ioctl __user *arg) 35 { 36 u32 verb, res; 37 38 if (get_user(verb, &arg->verb)) 39 return -EFAULT; 40 res = snd_hda_codec_read(codec, verb >> 24, 0, 41 (verb >> 8) & 0xffff, verb & 0xff); 42 if (put_user(res, &arg->res)) 43 return -EFAULT; 44 return 0; 45 } 46 47 static int get_wcap_ioctl(struct hda_codec *codec, 48 struct hda_verb_ioctl __user *arg) 49 { 50 u32 verb, res; 51 52 if (get_user(verb, &arg->verb)) 53 return -EFAULT; 54 res = get_wcaps(codec, verb >> 24); 55 if (put_user(res, &arg->res)) 56 return -EFAULT; 57 return 0; 58 } 59 60 61 /* 62 */ 63 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, 64 unsigned int cmd, unsigned long arg) 65 { 66 struct hda_codec *codec = hw->private_data; 67 void __user *argp = (void __user *)arg; 68 69 switch (cmd) { 70 case HDA_IOCTL_PVERSION: 71 return put_user(HDA_HWDEP_VERSION, (int __user *)argp); 72 case HDA_IOCTL_VERB_WRITE: 73 return verb_write_ioctl(codec, argp); 74 case HDA_IOCTL_GET_WCAP: 75 return get_wcap_ioctl(codec, argp); 76 } 77 return -ENOIOCTLCMD; 78 } 79 80 #ifdef CONFIG_COMPAT 81 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file, 82 unsigned int cmd, unsigned long arg) 83 { 84 return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg)); 85 } 86 #endif 87 88 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file) 89 { 90 #ifndef CONFIG_SND_DEBUG_VERBOSE 91 if (!capable(CAP_SYS_RAWIO)) 92 return -EACCES; 93 #endif 94 return 0; 95 } 96 97 int snd_hda_create_hwdep(struct hda_codec *codec) 98 { 99 char hwname[16]; 100 struct snd_hwdep *hwdep; 101 int err; 102 103 sprintf(hwname, "HDA Codec %d", codec->addr); 104 err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep); 105 if (err < 0) 106 return err; 107 codec->hwdep = hwdep; 108 sprintf(hwdep->name, "HDA Codec %d", codec->addr); 109 hwdep->iface = SNDRV_HWDEP_IFACE_HDA; 110 hwdep->private_data = codec; 111 hwdep->exclusive = 1; 112 113 hwdep->ops.open = hda_hwdep_open; 114 hwdep->ops.ioctl = hda_hwdep_ioctl; 115 #ifdef CONFIG_COMPAT 116 hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat; 117 #endif 118 119 /* for sysfs */ 120 hwdep->dev.groups = snd_hda_dev_attr_groups; 121 dev_set_drvdata(&hwdep->dev, codec); 122 123 return 0; 124 } 125