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 <sound/driver.h> 22 #include <linux/init.h> 23 #include <linux/slab.h> 24 #include <linux/pci.h> 25 #include <linux/compat.h> 26 #include <linux/mutex.h> 27 #include <sound/core.h> 28 #include "hda_codec.h" 29 #include "hda_local.h" 30 #include <sound/hda_hwdep.h> 31 32 /* 33 * write/read an out-of-bound verb 34 */ 35 static int verb_write_ioctl(struct hda_codec *codec, 36 struct hda_verb_ioctl __user *arg) 37 { 38 u32 verb, res; 39 40 if (get_user(verb, &arg->verb)) 41 return -EFAULT; 42 res = snd_hda_codec_read(codec, verb >> 24, 0, 43 (verb >> 8) & 0xffff, verb & 0xff); 44 if (put_user(res, &arg->res)) 45 return -EFAULT; 46 return 0; 47 } 48 49 static int get_wcap_ioctl(struct hda_codec *codec, 50 struct hda_verb_ioctl __user *arg) 51 { 52 u32 verb, res; 53 54 if (get_user(verb, &arg->verb)) 55 return -EFAULT; 56 res = get_wcaps(codec, verb >> 24); 57 if (put_user(res, &arg->res)) 58 return -EFAULT; 59 return 0; 60 } 61 62 63 /* 64 */ 65 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, 66 unsigned int cmd, unsigned long arg) 67 { 68 struct hda_codec *codec = hw->private_data; 69 void __user *argp = (void __user *)arg; 70 71 switch (cmd) { 72 case HDA_IOCTL_PVERSION: 73 return put_user(HDA_HWDEP_VERSION, (int __user *)argp); 74 case HDA_IOCTL_VERB_WRITE: 75 return verb_write_ioctl(codec, argp); 76 case HDA_IOCTL_GET_WCAP: 77 return get_wcap_ioctl(codec, argp); 78 } 79 return -ENOIOCTLCMD; 80 } 81 82 #ifdef CONFIG_COMPAT 83 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file, 84 unsigned int cmd, unsigned long arg) 85 { 86 return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg)); 87 } 88 #endif 89 90 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file) 91 { 92 #ifndef CONFIG_SND_DEBUG_DETECT 93 if (!capable(CAP_SYS_RAWIO)) 94 return -EACCES; 95 #endif 96 return 0; 97 } 98 99 int __devinit snd_hda_create_hwdep(struct hda_codec *codec) 100 { 101 char hwname[16]; 102 struct snd_hwdep *hwdep; 103 int err; 104 105 sprintf(hwname, "HDA Codec %d", codec->addr); 106 err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep); 107 if (err < 0) 108 return err; 109 codec->hwdep = hwdep; 110 sprintf(hwdep->name, "HDA Codec %d", codec->addr); 111 hwdep->iface = SNDRV_HWDEP_IFACE_HDA; 112 hwdep->private_data = codec; 113 hwdep->exclusive = 1; 114 115 hwdep->ops.open = hda_hwdep_open; 116 hwdep->ops.ioctl = hda_hwdep_ioctl; 117 #ifdef CONFIG_COMPAT 118 hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat; 119 #endif 120 121 return 0; 122 } 123