[linux-2.6-block.git] / sound / pci / hda / hda_hwdep.c

/*
 * HWDEP Interface for HD-audio codec
 *
 * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
 *
 *  This driver is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This driver is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/compat.h>
#include <linux/nospec.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"
#include <sound/hda_hwdep.h>
#include <sound/minors.h>

/*
 * write/read an out-of-bound verb
 */
static int verb_write_ioctl(struct hda_codec *codec,
			    struct hda_verb_ioctl __user *arg)
{
	u32 verb, res;

	if (get_user(verb, &arg->verb))
		return -EFAULT;
	res = snd_hda_codec_read(codec, verb >> 24, 0,
				 (verb >> 8) & 0xffff, verb & 0xff);
	if (put_user(res, &arg->res))
		return -EFAULT;
	return 0;
}

static int get_wcap_ioctl(struct hda_codec *codec,
			  struct hda_verb_ioctl __user *arg)
{
	u32 verb, res;
	
	if (get_user(verb, &arg->verb))
		return -EFAULT;
	/* open-code get_wcaps(verb>>24) with nospec */
	verb >>= 24;
	if (verb < codec->core.start_nid ||
	    verb >= codec->core.start_nid + codec->core.num_nodes) {
		res = 0;
	} else {
		verb -= codec->core.start_nid;
		verb = array_index_nospec(verb, codec->core.num_nodes);
		res = codec->wcaps[verb];
	}
	if (put_user(res, &arg->res))
		return -EFAULT;
	return 0;
}


/*
 */
static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
			   unsigned int cmd, unsigned long arg)
{
	struct hda_codec *codec = hw->private_data;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case HDA_IOCTL_PVERSION:
		return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
	case HDA_IOCTL_VERB_WRITE:
		return verb_write_ioctl(codec, argp);
	case HDA_IOCTL_GET_WCAP:
		return get_wcap_ioctl(codec, argp);
	}
	return -ENOIOCTLCMD;
}

#ifdef CONFIG_COMPAT
static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
				  unsigned int cmd, unsigned long arg)
{
	return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
}
#endif

static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
{
#ifndef CONFIG_SND_DEBUG_VERBOSE
	if (!capable(CAP_SYS_RAWIO))
		return -EACCES;
#endif
	return 0;
}

int snd_hda_create_hwdep(struct hda_codec *codec)
{
	char hwname[16];
	struct snd_hwdep *hwdep;
	int err;

	sprintf(hwname, "HDA Codec %d", codec->addr);
	err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
	if (err < 0)
		return err;
	codec->hwdep = hwdep;
	sprintf(hwdep->name, "HDA Codec %d", codec->addr);
	hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
	hwdep->private_data = codec;
	hwdep->exclusive = 1;

	hwdep->ops.open = hda_hwdep_open;
	hwdep->ops.ioctl = hda_hwdep_ioctl;
#ifdef CONFIG_COMPAT
	hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
#endif

	/* for sysfs */
	hwdep->dev.groups = snd_hda_dev_attr_groups;
	dev_set_drvdata(&hwdep->dev, codec);

	return 0;
}
Commit	Line	Data
2807314d TI	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
2807314d TI	21	#include <linux/init.h>
2807314d TI	22	#include <linux/slab.h>
2807314d	23	#include <linux/compat.h>
69fa6f19	24	#include <linux/nospec.h>
2807314d TI	25	#include <sound/core.h>
	26	#include "hda_codec.h"
	27	#include "hda_local.h"
	28	#include <sound/hda_hwdep.h>
d7ffba19	29	#include <sound/minors.h>
2807314d TI	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;
69fa6f19 TI	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	}
2807314d TI	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	{
312d045c	94	return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
2807314d TI	95	}
	96	#endif
	97
	98	static int hda_hwdep_open(struct snd_hwdep hw, struct file file)
	99	{
62cf872a	100	#ifndef CONFIG_SND_DEBUG_VERBOSE
2807314d TI	101	if (!capable(CAP_SYS_RAWIO))
	102	return -EACCES;
	103	#endif
	104	return 0;
	105	}
	106
6a0f56a7	107	int snd_hda_create_hwdep(struct hda_codec *codec)
2807314d TI	108	{
	109	char hwname[16];
	110	struct snd_hwdep *hwdep;
	111	int err;
	112
	113	sprintf(hwname, "HDA Codec %d", codec->addr);
6efdd851	114	err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
2807314d TI	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
7b461600 TI	129	/* for sysfs */
	130	hwdep->dev.groups = snd_hda_dev_attr_groups;
	131	dev_set_drvdata(&hwdep->dev, codec);
13aeaf68	132
2807314d TI	133	return 0;
2807314d TI	134	}