sound/pci/hda/hda_hwdep.c

   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/pci.h>
  24 #include <linux/compat.h>
  25 #include <linux/mutex.h>
  26 #include <linux/ctype.h>
  27 #include <sound/core.h>
  28 #include "hda_codec.h"
  29 #include "hda_local.h"
  30 #include <sound/hda_hwdep.h>
  31 #include <sound/minors.h>
  32
  33 /*
  34  * write/read an out-of-bound verb
  35  */
  36 static int verb_write_ioctl(struct hda_codec *codec,
  37                             struct hda_verb_ioctl __user *arg)
  38 {
  39         u32 verb, res;
  40
  41         if (get_user(verb, &arg->verb))
  42                 return -EFAULT;
  43         res = snd_hda_codec_read(codec, verb >> 24, 0,
  44                                  (verb >> 8) & 0xffff, verb & 0xff);
  45         if (put_user(res, &arg->res))
  46                 return -EFAULT;
  47         return 0;
  48 }
  49
  50 static int get_wcap_ioctl(struct hda_codec *codec,
  51                           struct hda_verb_ioctl __user *arg)
  52 {
  53         u32 verb, res;
  54
  55         if (get_user(verb, &arg->verb))
  56                 return -EFAULT;
  57         res = get_wcaps(codec, verb >> 24);
  58         if (put_user(res, &arg->res))
  59                 return -EFAULT;
  60         return 0;
  61 }
  62
  63
  64 /*
  65  */
  66 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
  67                            unsigned int cmd, unsigned long arg)
  68 {
  69         struct hda_codec *codec = hw->private_data;
  70         void __user *argp = (void __user *)arg;
  71
  72         switch (cmd) {
  73         case HDA_IOCTL_PVERSION:
  74                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
  75         case HDA_IOCTL_VERB_WRITE:
  76                 return verb_write_ioctl(codec, argp);
  77         case HDA_IOCTL_GET_WCAP:
  78                 return get_wcap_ioctl(codec, argp);
  79         }
  80         return -ENOIOCTLCMD;
  81 }
  82
  83 #ifdef CONFIG_COMPAT
  84 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
  85                                   unsigned int cmd, unsigned long arg)
  86 {
  87         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
  88 }
  89 #endif
  90
  91 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
  92 {
  93 #ifndef CONFIG_SND_DEBUG_VERBOSE
  94         if (!capable(CAP_SYS_RAWIO))
  95                 return -EACCES;
  96 #endif
  97         return 0;
  98 }
  99
 100 static void clear_hwdep_elements(struct hda_codec *codec)
 101 {
 102         char **head;
 103         int i;
 104
 105         /* clear init verbs */
 106         snd_array_free(&codec->init_verbs);
 107         /* clear hints */
 108         head = codec->hints.list;
 109         for (i = 0; i < codec->hints.used; i++, head++)
 110                 kfree(*head);
 111         snd_array_free(&codec->hints);
 112 }
 113
 114 static void hwdep_free(struct snd_hwdep *hwdep)
 115 {
 116         clear_hwdep_elements(hwdep->private_data);
 117 }
 118
 119 int __devinit snd_hda_create_hwdep(struct hda_codec *codec)
 120 {
 121         char hwname[16];
 122         struct snd_hwdep *hwdep;
 123         int err;
 124
 125         sprintf(hwname, "HDA Codec %d", codec->addr);
 126         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 127         if (err < 0)
 128                 return err;
 129         codec->hwdep = hwdep;
 130         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 131         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 132         hwdep->private_data = codec;
 133         hwdep->private_free = hwdep_free;
 134         hwdep->exclusive = 1;
 135
 136         hwdep->ops.open = hda_hwdep_open;
 137         hwdep->ops.ioctl = hda_hwdep_ioctl;
 138 #ifdef CONFIG_COMPAT
 139         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 140 #endif
 141
 142         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 143         snd_array_init(&codec->hints, sizeof(char *), 32);
 144
 145         return 0;
 146 }
 147
 148 /*
 149  * sysfs interface
 150  */
 151
 152 static int clear_codec(struct hda_codec *codec)
 153 {
 154         snd_hda_codec_reset(codec);
 155         clear_hwdep_elements(codec);
 156         return 0;
 157 }
 158
 159 static int reconfig_codec(struct hda_codec *codec)
 160 {
 161         int err;
 162
 163         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 164         snd_hda_codec_reset(codec);
 165         err = snd_hda_codec_configure(codec);
 166         if (err < 0)
 167                 return err;
 168         /* rebuild PCMs */
 169         err = snd_hda_build_pcms(codec->bus);
 170         if (err < 0)
 171                 return err;
 172         /* rebuild mixers */
 173         err = snd_hda_codec_build_controls(codec);
 174         if (err < 0)
 175                 return err;
 176         return 0;
 177 }
 178
 179 /*
 180  * allocate a string at most len chars, and remove the trailing EOL
 181  */
 182 static char *kstrndup_noeol(const char *src, size_t len)
 183 {
 184         char *s = kstrndup(src, len, GFP_KERNEL);
 185         char *p;
 186         if (!s)
 187                 return NULL;
 188         p = strchr(s, '\n');
 189         if (p)
 190                 *p = 0;
 191         return s;
 192 }
 193
 194 #define CODEC_INFO_SHOW(type)                                   \
 195 static ssize_t type##_show(struct device *dev,                  \
 196                            struct device_attribute *attr,       \
 197                            char *buf)                           \
 198 {                                                               \
 199         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 200         struct hda_codec *codec = hwdep->private_data;          \
 201         return sprintf(buf, "0x%x\n", codec->type);             \
 202 }
 203
 204 #define CODEC_INFO_STR_SHOW(type)                               \
 205 static ssize_t type##_show(struct device *dev,                  \
 206                              struct device_attribute *attr,     \
 207                                         char *buf)              \
 208 {                                                               \
 209         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 210         struct hda_codec *codec = hwdep->private_data;          \
 211         return sprintf(buf, "%s\n",                             \
 212                        codec->type ? codec->type : "");         \
 213 }
 214
 215 CODEC_INFO_SHOW(vendor_id);
 216 CODEC_INFO_SHOW(subsystem_id);
 217 CODEC_INFO_SHOW(revision_id);
 218 CODEC_INFO_SHOW(afg);
 219 CODEC_INFO_SHOW(mfg);
 220 CODEC_INFO_STR_SHOW(name);
 221 CODEC_INFO_STR_SHOW(modelname);
 222
 223 #define CODEC_INFO_STORE(type)                                  \
 224 static ssize_t type##_store(struct device *dev,                 \
 225                             struct device_attribute *attr,      \
 226                             const char *buf, size_t count)      \
 227 {                                                               \
 228         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 229         struct hda_codec *codec = hwdep->private_data;          \
 230         char *after;                                            \
 231         codec->type = simple_strtoul(buf, &after, 0);           \
 232         return count;                                           \
 233 }
 234
 235 #define CODEC_INFO_STR_STORE(type)                              \
 236 static ssize_t type##_store(struct device *dev,                 \
 237                             struct device_attribute *attr,      \
 238                             const char *buf, size_t count)      \
 239 {                                                               \
 240         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 241         struct hda_codec *codec = hwdep->private_data;          \
 242         char *s = kstrndup_noeol(buf, 64);                      \
 243         if (!s)                                                 \
 244                 return -ENOMEM;                                 \
 245         kfree(codec->type);                                     \
 246         codec->type = s;                                        \
 247         return count;                                           \
 248 }
 249
 250 CODEC_INFO_STORE(vendor_id);
 251 CODEC_INFO_STORE(subsystem_id);
 252 CODEC_INFO_STORE(revision_id);
 253 CODEC_INFO_STR_STORE(name);
 254 CODEC_INFO_STR_STORE(modelname);
 255
 256 #define CODEC_ACTION_STORE(type)                                \
 257 static ssize_t type##_store(struct device *dev,                 \
 258                             struct device_attribute *attr,      \
 259                             const char *buf, size_t count)      \
 260 {                                                               \
 261         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 262         struct hda_codec *codec = hwdep->private_data;          \
 263         int err = 0;                                            \
 264         if (*buf)                                               \
 265                 err = type##_codec(codec);                      \
 266         return err < 0 ? err : count;                           \
 267 }
 268
 269 CODEC_ACTION_STORE(reconfig);
 270 CODEC_ACTION_STORE(clear);
 271
 272 static ssize_t init_verbs_store(struct device *dev,
 273                                 struct device_attribute *attr,
 274                                 const char *buf, size_t count)
 275 {
 276         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 277         struct hda_codec *codec = hwdep->private_data;
 278         char *p;
 279         struct hda_verb verb, *v;
 280
 281         verb.nid = simple_strtoul(buf, &p, 0);
 282         verb.verb = simple_strtoul(p, &p, 0);
 283         verb.param = simple_strtoul(p, &p, 0);
 284         if (!verb.nid || !verb.verb || !verb.param)
 285                 return -EINVAL;
 286         v = snd_array_new(&codec->init_verbs);
 287         if (!v)
 288                 return -ENOMEM;
 289         *v = verb;
 290         return count;
 291 }
 292
 293 static ssize_t hints_store(struct device *dev,
 294                            struct device_attribute *attr,
 295                            const char *buf, size_t count)
 296 {
 297         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 298         struct hda_codec *codec = hwdep->private_data;
 299         char *p;
 300         char **hint;
 301
 302         if (!*buf || isspace(*buf) || *buf == '#' || *buf == '\n')
 303                 return count;
 304         p = kstrndup_noeol(buf, 1024);
 305         if (!p)
 306                 return -ENOMEM;
 307         hint = snd_array_new(&codec->hints);
 308         if (!hint) {
 309                 kfree(p);
 310                 return -ENOMEM;
 311         }
 312         *hint = p;
 313         return count;
 314 }
 315
 316 #define CODEC_ATTR_RW(type) \
 317         __ATTR(type, 0644, type##_show, type##_store)
 318 #define CODEC_ATTR_RO(type) \
 319         __ATTR_RO(type)
 320 #define CODEC_ATTR_WO(type) \
 321         __ATTR(type, 0200, NULL, type##_store)
 322
 323 static struct device_attribute codec_attrs[] = {
 324         CODEC_ATTR_RW(vendor_id),
 325         CODEC_ATTR_RW(subsystem_id),
 326         CODEC_ATTR_RW(revision_id),
 327         CODEC_ATTR_RO(afg),
 328         CODEC_ATTR_RO(mfg),
 329         CODEC_ATTR_RW(name),
 330         CODEC_ATTR_RW(modelname),
 331         CODEC_ATTR_WO(init_verbs),
 332         CODEC_ATTR_WO(hints),
 333         CODEC_ATTR_WO(reconfig),
 334         CODEC_ATTR_WO(clear),
 335 };
 336
 337 /*
 338  * create sysfs files on hwdep directory
 339  */
 340 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 341 {
 342         struct snd_hwdep *hwdep = codec->hwdep;
 343         int i;
 344
 345         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 346                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 347                                           hwdep->device, &codec_attrs[i]);
 348         return 0;
 349 }