[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/pci.h>
#include <linux/compat.h>
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <linux/firmware.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"
#include <sound/hda_hwdep.h>
#include <sound/minors.h>

/* hint string pair */
struct hda_hint {
	const char *key;
	const char *val;	/* contained in the same alloc as key */
};

/*
 * 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;
	res = get_wcaps(codec, verb >> 24);
	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;
}

static void clear_hwdep_elements(struct hda_codec *codec)
{
	int i;

	/* clear init verbs */
	snd_array_free(&codec->init_verbs);
	/* clear hints */
	for (i = 0; i < codec->hints.used; i++) {
		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
		kfree(hint->key); /* we don't need to free hint->val */
	}
	snd_array_free(&codec->hints);
	snd_array_free(&codec->user_pins);
}

static void hwdep_free(struct snd_hwdep *hwdep)
{
	clear_hwdep_elements(hwdep->private_data);
}

int /*__devinit*/ 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->bus->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->private_free = hwdep_free;
	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

	snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
	snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
	snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);

	return 0;
}

#ifdef CONFIG_SND_HDA_RECONFIG

/*
 * sysfs interface
 */

static int clear_codec(struct hda_codec *codec)
{
	int err;

	err = snd_hda_codec_reset(codec);
	if (err < 0) {
		snd_printk(KERN_ERR "The codec is being used, can't free.\n");
		return err;
	}
	clear_hwdep_elements(codec);
	return 0;
}

static int reconfig_codec(struct hda_codec *codec)
{
	int err;

	snd_hda_power_up(codec);
	snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
	err = snd_hda_codec_reset(codec);
	if (err < 0) {
		snd_printk(KERN_ERR
			   "The codec is being used, can't reconfigure.\n");
		goto error;
	}
	err = snd_hda_codec_configure(codec);
	if (err < 0)
		goto error;
	/* rebuild PCMs */
	err = snd_hda_codec_build_pcms(codec);
	if (err < 0)
		goto error;
	/* rebuild mixers */
	err = snd_hda_codec_build_controls(codec);
	if (err < 0)
		goto error;
	err = snd_card_register(codec->bus->card);
 error:
	snd_hda_power_down(codec);
	return err;
}

/*
 * allocate a string at most len chars, and remove the trailing EOL
 */
static char *kstrndup_noeol(const char *src, size_t len)
{
	char *s = kstrndup(src, len, GFP_KERNEL);
	char *p;
	if (!s)
		return NULL;
	p = strchr(s, '\n');
	if (p)
		*p = 0;
	return s;
}

#define CODEC_INFO_SHOW(type)					\
static ssize_t type##_show(struct device *dev,			\
			   struct device_attribute *attr,	\
			   char *buf)				\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	return sprintf(buf, "0x%x\n", codec->type);		\
}

#define CODEC_INFO_STR_SHOW(type)				\
static ssize_t type##_show(struct device *dev,			\
			     struct device_attribute *attr,	\
					char *buf)		\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	return sprintf(buf, "%s\n",				\
		       codec->type ? codec->type : "");		\
}

CODEC_INFO_SHOW(vendor_id);
CODEC_INFO_SHOW(subsystem_id);
CODEC_INFO_SHOW(revision_id);
CODEC_INFO_SHOW(afg);
CODEC_INFO_SHOW(mfg);
CODEC_INFO_STR_SHOW(vendor_name);
CODEC_INFO_STR_SHOW(chip_name);
CODEC_INFO_STR_SHOW(modelname);

#define CODEC_INFO_STORE(type)					\
static ssize_t type##_store(struct device *dev,			\
			    struct device_attribute *attr,	\
			    const char *buf, size_t count)	\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	char *after;						\
	codec->type = simple_strtoul(buf, &after, 0);		\
	return count;						\
}

#define CODEC_INFO_STR_STORE(type)				\
static ssize_t type##_store(struct device *dev,			\
			    struct device_attribute *attr,	\
			    const char *buf, size_t count)	\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	char *s = kstrndup_noeol(buf, 64);			\
	if (!s)							\
		return -ENOMEM;					\
	kfree(codec->type);					\
	codec->type = s;					\
	return count;						\
}

CODEC_INFO_STORE(vendor_id);
CODEC_INFO_STORE(subsystem_id);
CODEC_INFO_STORE(revision_id);
CODEC_INFO_STR_STORE(vendor_name);
CODEC_INFO_STR_STORE(chip_name);
CODEC_INFO_STR_STORE(modelname);

#define CODEC_ACTION_STORE(type)				\
static ssize_t type##_store(struct device *dev,			\
			    struct device_attribute *attr,	\
			    const char *buf, size_t count)	\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	int err = 0;						\
	if (*buf)						\
		err = type##_codec(codec);			\
	return err < 0 ? err : count;				\
}

CODEC_ACTION_STORE(reconfig);
CODEC_ACTION_STORE(clear);

static ssize_t init_verbs_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int i, len = 0;
	for (i = 0; i < codec->init_verbs.used; i++) {
		struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
		len += snprintf(buf + len, PAGE_SIZE - len,
				"0x%02x 0x%03x 0x%04x\n",
				v->nid, v->verb, v->param);
	}
	return len;
}

static int parse_init_verbs(struct hda_codec *codec, const char *buf)
{
	struct hda_verb *v;
	int nid, verb, param;

	if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
		return -EINVAL;
	if (!nid || !verb)
		return -EINVAL;
	v = snd_array_new(&codec->init_verbs);
	if (!v)
		return -ENOMEM;
	v->nid = nid;
	v->verb = verb;
	v->param = param;
	return 0;
}

static ssize_t init_verbs_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int err = parse_init_verbs(codec, buf);
	if (err < 0)
		return err;
	return count;
}

static ssize_t hints_show(struct device *dev,
			  struct device_attribute *attr,
			  char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int i, len = 0;
	for (i = 0; i < codec->hints.used; i++) {
		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
		len += snprintf(buf + len, PAGE_SIZE - len,
				"%s = %s\n", hint->key, hint->val);
	}
	return len;
}

static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
{
	int i;

	for (i = 0; i < codec->hints.used; i++) {
		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
		if (!strcmp(hint->key, key))
			return hint;
	}
	return NULL;
}

static void remove_trail_spaces(char *str)
{
	char *p;
	if (!*str)
		return;
	p = str + strlen(str) - 1;
	for (; isspace(*p); p--) {
		*p = 0;
		if (p == str)
			return;
	}
}

#define MAX_HINTS	1024

static int parse_hints(struct hda_codec *codec, const char *buf)
{
	char *key, *val;
	struct hda_hint *hint;

	while (isspace(*buf))
		buf++;
	if (!*buf || *buf == '#' || *buf == '\n')
		return 0;
	if (*buf == '=')
		return -EINVAL;
	key = kstrndup_noeol(buf, 1024);
	if (!key)
		return -ENOMEM;
	/* extract key and val */
	val = strchr(key, '=');
	if (!val) {
		kfree(key);
		return -EINVAL;
	}
	*val++ = 0;
	while (isspace(*val))
		val++;
	remove_trail_spaces(key);
	remove_trail_spaces(val);
	hint = get_hint(codec, key);
	if (hint) {
		/* replace */
		kfree(hint->key);
		hint->key = key;
		hint->val = val;
		return 0;
	}
	/* allocate a new hint entry */
	if (codec->hints.used >= MAX_HINTS)
		hint = NULL;
	else
		hint = snd_array_new(&codec->hints);
	if (!hint) {
		kfree(key);
		return -ENOMEM;
	}
	hint->key = key;
	hint->val = val;
	return 0;
}

static ssize_t hints_store(struct device *dev,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int err = parse_hints(codec, buf);
	if (err < 0)
		return err;
	return count;
}

static ssize_t pin_configs_show(struct hda_codec *codec,
				struct snd_array *list,
				char *buf)
{
	int i, len = 0;
	for (i = 0; i < list->used; i++) {
		struct hda_pincfg *pin = snd_array_elem(list, i);
		len += sprintf(buf + len, "0x%02x 0x%08x\n",
			       pin->nid, pin->cfg);
	}
	return len;
}

static ssize_t init_pin_configs_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	return pin_configs_show(codec, &codec->init_pins, buf);
}

static ssize_t user_pin_configs_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	return pin_configs_show(codec, &codec->user_pins, buf);
}

static ssize_t driver_pin_configs_show(struct device *dev,
				       struct device_attribute *attr,
				       char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	return pin_configs_show(codec, &codec->driver_pins, buf);
}

#define MAX_PIN_CONFIGS		32

static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
{
	int nid, cfg;

	if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
		return -EINVAL;
	if (!nid)
		return -EINVAL;
	return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
}

static ssize_t user_pin_configs_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int err = parse_user_pin_configs(codec, buf);
	if (err < 0)
		return err;
	return count;
}

#define CODEC_ATTR_RW(type) \
	__ATTR(type, 0644, type##_show, type##_store)
#define CODEC_ATTR_RO(type) \
	__ATTR_RO(type)
#define CODEC_ATTR_WO(type) \
	__ATTR(type, 0200, NULL, type##_store)

static struct device_attribute codec_attrs[] = {
	CODEC_ATTR_RW(vendor_id),
	CODEC_ATTR_RW(subsystem_id),
	CODEC_ATTR_RW(revision_id),
	CODEC_ATTR_RO(afg),
	CODEC_ATTR_RO(mfg),
	CODEC_ATTR_RW(vendor_name),
	CODEC_ATTR_RW(chip_name),
	CODEC_ATTR_RW(modelname),
	CODEC_ATTR_RW(init_verbs),
	CODEC_ATTR_RW(hints),
	CODEC_ATTR_RO(init_pin_configs),
	CODEC_ATTR_RW(user_pin_configs),
	CODEC_ATTR_RO(driver_pin_configs),
	CODEC_ATTR_WO(reconfig),
	CODEC_ATTR_WO(clear),
};

/*
 * create sysfs files on hwdep directory
 */
int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
{
	struct snd_hwdep *hwdep = codec->hwdep;
	int i;

	for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
		snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
					  hwdep->device, &codec_attrs[i]);
	return 0;
}

/*
 * Look for hint string
 */
const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
{
	struct hda_hint *hint = get_hint(codec, key);
	return hint ? hint->val : NULL;
}
EXPORT_SYMBOL_HDA(snd_hda_get_hint);

int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
{
	const char *p = snd_hda_get_hint(codec, key);
	if (!p || !*p)
		return -ENOENT;
	switch (toupper(*p)) {
	case 'T': /* true */
	case 'Y': /* yes */
	case '1':
		return 1;
	}
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);

#endif /* CONFIG_SND_HDA_RECONFIG */

#ifdef CONFIG_SND_HDA_PATCH_LOADER

/* parser mode */
enum {
	LINE_MODE_NONE,
	LINE_MODE_CODEC,
	LINE_MODE_MODEL,
	LINE_MODE_PINCFG,
	LINE_MODE_VERB,
	LINE_MODE_HINT,
	NUM_LINE_MODES,
};

static inline int strmatch(const char *a, const char *b)
{
	return strnicmp(a, b, strlen(b)) == 0;
}

/* parse the contents after the line "[codec]"
 * accept only the line with three numbers, and assign the current codec
 */
static void parse_codec_mode(char *buf, struct hda_bus *bus,
			     struct hda_codec **codecp)
{
	unsigned int vendorid, subid, caddr;
	struct hda_codec *codec;

	*codecp = NULL;
	if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
		list_for_each_entry(codec, &bus->codec_list, list) {
			if (codec->addr == caddr) {
				*codecp = codec;
				break;
			}
		}
	}
}

/* parse the contents after the other command tags, [pincfg], [verb],
 * [hint] and [model]
 * just pass to the sysfs helper (only when any codec was specified)
 */
static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
			      struct hda_codec **codecp)
{
	if (!*codecp)
		return;
	parse_user_pin_configs(*codecp, buf);
}

static void parse_verb_mode(char *buf, struct hda_bus *bus,
			    struct hda_codec **codecp)
{
	if (!*codecp)
		return;
	parse_init_verbs(*codecp, buf);
}

static void parse_hint_mode(char *buf, struct hda_bus *bus,
			    struct hda_codec **codecp)
{
	if (!*codecp)
		return;
	parse_hints(*codecp, buf);
}

static void parse_model_mode(char *buf, struct hda_bus *bus,
			     struct hda_codec **codecp)
{
	if (!*codecp)
		return;
	kfree((*codecp)->modelname);
	(*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
}

struct hda_patch_item {
	const char *tag;
	void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
};

static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
	[LINE_MODE_CODEC] = { "[codec]", parse_codec_mode },
	[LINE_MODE_MODEL] = { "[model]", parse_model_mode },
	[LINE_MODE_VERB] = { "[verb]", parse_verb_mode },
	[LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode },
	[LINE_MODE_HINT] = { "[hint]", parse_hint_mode },
};

/* check the line starting with '[' -- change the parser mode accodingly */
static int parse_line_mode(char *buf, struct hda_bus *bus)
{
	int i;
	for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
		if (!patch_items[i].tag)
			continue;
		if (strmatch(buf, patch_items[i].tag))
			return i;
	}
	return LINE_MODE_NONE;
}

/* copy one line from the buffer in fw, and update the fields in fw
 * return zero if it reaches to the end of the buffer, or non-zero
 * if successfully copied a line
 *
 * the spaces at the beginning and the end of the line are stripped
 */
static int get_line_from_fw(char *buf, int size, struct firmware *fw)
{
	int len;
	const char *p = fw->data;
	while (isspace(*p) && fw->size) {
		p++;
		fw->size--;
	}
	if (!fw->size)
		return 0;
	if (size < fw->size)
		size = fw->size;

	for (len = 0; len < fw->size; len++) {
		if (!*p)
			break;
		if (*p == '\n') {
			p++;
			len++;
			break;
		}
		if (len < size)
			*buf++ = *p++;
	}
	*buf = 0;
	fw->size -= len;
	fw->data = p;
	remove_trail_spaces(buf);
	return 1;
}

/*
 * load a "patch" firmware file and parse it
 */
int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
{
	int err;
	const struct firmware *fw;
	struct firmware tmp;
	char buf[128];
	struct hda_codec *codec;
	int line_mode;
	struct device *dev = bus->card->dev;

	if (snd_BUG_ON(!dev))
		return -ENODEV;
	err = request_firmware(&fw, patch, dev);
	if (err < 0) {
		printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
		       patch);
		return err;
	}

	tmp = *fw;
	line_mode = LINE_MODE_NONE;
	codec = NULL;
	while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
		if (!*buf || *buf == '#' || *buf == '\n')
			continue;
		if (*buf == '[')
			line_mode = parse_line_mode(buf, bus);
		else if (patch_items[line_mode].parser)
			patch_items[line_mode].parser(buf, bus, &codec);
	}
	release_firmware(fw);
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_load_patch);
#endif /* CONFIG_SND_HDA_PATCH_LOADER */
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>
	22	#include <linux/slab.h>
	23	#include <linux/pci.h>
	24	#include <linux/compat.h>
	25	#include <linux/mutex.h>
1e1be432	26	#include <linux/ctype.h>
4ea6fbc8	27	#include <linux/firmware.h>
2807314d TI	28	#include <sound/core.h>
	29	#include "hda_codec.h"
	30	#include "hda_local.h"
	31	#include <sound/hda_hwdep.h>
d7ffba19	32	#include <sound/minors.h>
2807314d	33
43b62713 TI	34	/* hint string pair */
	35	struct hda_hint {
	36	const char *key;
	37	const char val; / contained in the same alloc as key */
	38	};
	39
2807314d TI	40	/*
	41	* write/read an out-of-bound verb
	42	*/
	43	static int verb_write_ioctl(struct hda_codec *codec,
	44	struct hda_verb_ioctl __user *arg)
	45	{
	46	u32 verb, res;
	47
	48	if (get_user(verb, &arg->verb))
	49	return -EFAULT;
	50	res = snd_hda_codec_read(codec, verb >> 24, 0,
	51	(verb >> 8) & 0xffff, verb & 0xff);
	52	if (put_user(res, &arg->res))
	53	return -EFAULT;
	54	return 0;
	55	}
	56
	57	static int get_wcap_ioctl(struct hda_codec *codec,
	58	struct hda_verb_ioctl __user *arg)
	59	{
	60	u32 verb, res;
	61
	62	if (get_user(verb, &arg->verb))
	63	return -EFAULT;
	64	res = get_wcaps(codec, verb >> 24);
	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
11aeff08 TI	107	static void clear_hwdep_elements(struct hda_codec *codec)
11aeff08 TI	108	{
1e1be432 TI	109	int i;
1e1be432 TI	110
11aeff08 TI	111	/* clear init verbs */
11aeff08 TI	112	snd_array_free(&codec->init_verbs);
1e1be432	113	/* clear hints */
43b62713 TI	114	for (i = 0; i < codec->hints.used; i++) {
	115	struct hda_hint *hint = snd_array_elem(&codec->hints, i);
	116	kfree(hint->key); /* we don't need to free hint->val */
	117	}
1e1be432	118	snd_array_free(&codec->hints);
346ff70f	119	snd_array_free(&codec->user_pins);
11aeff08 TI	120	}
	121
	122	static void hwdep_free(struct snd_hwdep *hwdep)
	123	{
	124	clear_hwdep_elements(hwdep->private_data);
	125	}
	126
1289e9e8	127	int /__devinit/ snd_hda_create_hwdep(struct hda_codec *codec)
2807314d TI	128	{
	129	char hwname[16];
	130	struct snd_hwdep *hwdep;
	131	int err;
	132
	133	sprintf(hwname, "HDA Codec %d", codec->addr);
	134	err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
	135	if (err < 0)
	136	return err;
	137	codec->hwdep = hwdep;
	138	sprintf(hwdep->name, "HDA Codec %d", codec->addr);
	139	hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
	140	hwdep->private_data = codec;
11aeff08	141	hwdep->private_free = hwdep_free;
2807314d TI	142	hwdep->exclusive = 1;
	143
	144	hwdep->ops.open = hda_hwdep_open;
	145	hwdep->ops.ioctl = hda_hwdep_ioctl;
	146	#ifdef CONFIG_COMPAT
	147	hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
	148	#endif
	149
11aeff08	150	snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
43b62713	151	snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
346ff70f	152	snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
11aeff08	153
2807314d TI	154	return 0;
2807314d TI	155	}
d7ffba19	156
e7ee058c TI	157	#ifdef CONFIG_SND_HDA_RECONFIG
e7ee058c TI	158
d7ffba19 TI	159	/*
	160	* sysfs interface
	161	*/
	162
	163	static int clear_codec(struct hda_codec *codec)
	164	{
a65d629c TI	165	int err;
	166
	167	err = snd_hda_codec_reset(codec);
	168	if (err < 0) {
	169	snd_printk(KERN_ERR "The codec is being used, can't free.\n");
	170	return err;
	171	}
11aeff08	172	clear_hwdep_elements(codec);
d7ffba19 TI	173	return 0;
	174	}
	175
	176	static int reconfig_codec(struct hda_codec *codec)
	177	{
	178	int err;
	179
bb6ac72f	180	snd_hda_power_up(codec);
d7ffba19	181	snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
a65d629c TI	182	err = snd_hda_codec_reset(codec);
	183	if (err < 0) {
	184	snd_printk(KERN_ERR
	185	"The codec is being used, can't reconfigure.\n");
bb6ac72f	186	goto error;
a65d629c	187	}
d7ffba19 TI	188	err = snd_hda_codec_configure(codec);
d7ffba19 TI	189	if (err < 0)
bb6ac72f	190	goto error;
d7ffba19	191	/* rebuild PCMs */
529bd6c4	192	err = snd_hda_codec_build_pcms(codec);
d7ffba19	193	if (err < 0)
bb6ac72f	194	goto error;
d7ffba19 TI	195	/* rebuild mixers */
	196	err = snd_hda_codec_build_controls(codec);
	197	if (err < 0)
bb6ac72f TI	198	goto error;
	199	err = snd_card_register(codec->bus->card);
	200	error:
	201	snd_hda_power_down(codec);
	202	return err;
d7ffba19 TI	203	}
	204
	205	/*
	206	* allocate a string at most len chars, and remove the trailing EOL
	207	*/
	208	static char kstrndup_noeol(const char src, size_t len)
	209	{
	210	char *s = kstrndup(src, len, GFP_KERNEL);
	211	char *p;
	212	if (!s)
	213	return NULL;
	214	p = strchr(s, '\n');
	215	if (p)
	216	*p = 0;
	217	return s;
	218	}
	219
	220	#define CODEC_INFO_SHOW(type) \
	221	static ssize_t type##_show(struct device *dev, \
	222	struct device_attribute *attr, \
	223	char *buf) \
	224	{ \
	225	struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
	226	struct hda_codec *codec = hwdep->private_data; \
	227	return sprintf(buf, "0x%x\n", codec->type); \
	228	}
	229
	230	#define CODEC_INFO_STR_SHOW(type) \
	231	static ssize_t type##_show(struct device *dev, \
	232	struct device_attribute *attr, \
	233	char *buf) \
	234	{ \
	235	struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
	236	struct hda_codec *codec = hwdep->private_data; \
	237	return sprintf(buf, "%s\n", \
	238	codec->type ? codec->type : ""); \
	239	}
	240
	241	CODEC_INFO_SHOW(vendor_id);
	242	CODEC_INFO_SHOW(subsystem_id);
	243	CODEC_INFO_SHOW(revision_id);
	244	CODEC_INFO_SHOW(afg);
	245	CODEC_INFO_SHOW(mfg);
812a2cca TI	246	CODEC_INFO_STR_SHOW(vendor_name);
812a2cca TI	247	CODEC_INFO_STR_SHOW(chip_name);
d7ffba19 TI	248	CODEC_INFO_STR_SHOW(modelname);
	249
	250	#define CODEC_INFO_STORE(type) \
	251	static ssize_t type##_store(struct device *dev, \
	252	struct device_attribute *attr, \
	253	const char *buf, size_t count) \
	254	{ \
	255	struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
	256	struct hda_codec *codec = hwdep->private_data; \
	257	char *after; \
	258	codec->type = simple_strtoul(buf, &after, 0); \
	259	return count; \
	260	}
	261
	262	#define CODEC_INFO_STR_STORE(type) \
	263	static ssize_t type##_store(struct device *dev, \
	264	struct device_attribute *attr, \
	265	const char *buf, size_t count) \
	266	{ \
	267	struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
	268	struct hda_codec *codec = hwdep->private_data; \
	269	char *s = kstrndup_noeol(buf, 64); \
	270	if (!s) \
	271	return -ENOMEM; \
	272	kfree(codec->type); \
	273	codec->type = s; \
	274	return count; \
	275	}
	276
	277	CODEC_INFO_STORE(vendor_id);
	278	CODEC_INFO_STORE(subsystem_id);
	279	CODEC_INFO_STORE(revision_id);
812a2cca TI	280	CODEC_INFO_STR_STORE(vendor_name);
812a2cca TI	281	CODEC_INFO_STR_STORE(chip_name);
d7ffba19 TI	282	CODEC_INFO_STR_STORE(modelname);
	283
	284	#define CODEC_ACTION_STORE(type) \
	285	static ssize_t type##_store(struct device *dev, \
	286	struct device_attribute *attr, \
	287	const char *buf, size_t count) \
	288	{ \
	289	struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
	290	struct hda_codec *codec = hwdep->private_data; \
	291	int err = 0; \
	292	if (*buf) \
	293	err = type##_codec(codec); \
	294	return err < 0 ? err : count; \
	295	}
	296
	297	CODEC_ACTION_STORE(reconfig);
	298	CODEC_ACTION_STORE(clear);
	299
ab1726f9 TI	300	static ssize_t init_verbs_show(struct device *dev,
	301	struct device_attribute *attr,
	302	char *buf)
	303	{
	304	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	305	struct hda_codec *codec = hwdep->private_data;
	306	int i, len = 0;
	307	for (i = 0; i < codec->init_verbs.used; i++) {
	308	struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
	309	len += snprintf(buf + len, PAGE_SIZE - len,
	310	"0x%02x 0x%03x 0x%04x\n",
	311	v->nid, v->verb, v->param);
	312	}
	313	return len;
	314	}
	315
4ea6fbc8	316	static int parse_init_verbs(struct hda_codec codec, const char buf)
11aeff08	317	{
55290e19 TI	318	struct hda_verb *v;
55290e19 TI	319	int nid, verb, param;
11aeff08	320
55290e19 TI	321	if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
	322	return -EINVAL;
	323	if (!nid \|\| !verb)
11aeff08 TI	324	return -EINVAL;
	325	v = snd_array_new(&codec->init_verbs);
	326	if (!v)
	327	return -ENOMEM;
55290e19 TI	328	v->nid = nid;
	329	v->verb = verb;
	330	v->param = param;
4ea6fbc8 TI	331	return 0;
	332	}
	333
	334	static ssize_t init_verbs_store(struct device *dev,
	335	struct device_attribute *attr,
	336	const char *buf, size_t count)
	337	{
	338	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	339	struct hda_codec *codec = hwdep->private_data;
	340	int err = parse_init_verbs(codec, buf);
	341	if (err < 0)
	342	return err;
11aeff08 TI	343	return count;
	344	}
	345
ab1726f9 TI	346	static ssize_t hints_show(struct device *dev,
	347	struct device_attribute *attr,
	348	char *buf)
	349	{
	350	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	351	struct hda_codec *codec = hwdep->private_data;
	352	int i, len = 0;
	353	for (i = 0; i < codec->hints.used; i++) {
	354	struct hda_hint *hint = snd_array_elem(&codec->hints, i);
	355	len += snprintf(buf + len, PAGE_SIZE - len,
	356	"%s = %s\n", hint->key, hint->val);
	357	}
	358	return len;
	359	}
	360
43b62713 TI	361	static struct hda_hint get_hint(struct hda_codec codec, const char *key)
	362	{
	363	int i;
	364
	365	for (i = 0; i < codec->hints.used; i++) {
	366	struct hda_hint *hint = snd_array_elem(&codec->hints, i);
	367	if (!strcmp(hint->key, key))
	368	return hint;
	369	}
	370	return NULL;
	371	}
	372
	373	static void remove_trail_spaces(char *str)
	374	{
	375	char *p;
	376	if (!*str)
	377	return;
	378	p = str + strlen(str) - 1;
	379	for (; isspace(*p); p--) {
	380	*p = 0;
	381	if (p == str)
	382	return;
	383	}
	384	}
	385
	386	#define MAX_HINTS 1024
	387
4ea6fbc8	388	static int parse_hints(struct hda_codec codec, const char buf)
1e1be432	389	{
43b62713 TI	390	char key, val;
43b62713 TI	391	struct hda_hint *hint;
1e1be432	392
43b62713 TI	393	while (isspace(*buf))
	394	buf++;
	395	if (!buf \|\| buf == '#' \|\| *buf == '\n')
4ea6fbc8	396	return 0;
43b62713 TI	397	if (*buf == '=')
	398	return -EINVAL;
	399	key = kstrndup_noeol(buf, 1024);
	400	if (!key)
1e1be432	401	return -ENOMEM;
43b62713 TI	402	/* extract key and val */
	403	val = strchr(key, '=');
	404	if (!val) {
	405	kfree(key);
	406	return -EINVAL;
	407	}
	408	*val++ = 0;
	409	while (isspace(*val))
	410	val++;
	411	remove_trail_spaces(key);
	412	remove_trail_spaces(val);
	413	hint = get_hint(codec, key);
	414	if (hint) {
	415	/* replace */
	416	kfree(hint->key);
	417	hint->key = key;
	418	hint->val = val;
4ea6fbc8	419	return 0;
43b62713 TI	420	}
	421	/* allocate a new hint entry */
	422	if (codec->hints.used >= MAX_HINTS)
	423	hint = NULL;
	424	else
	425	hint = snd_array_new(&codec->hints);
1e1be432	426	if (!hint) {
43b62713	427	kfree(key);
1e1be432 TI	428	return -ENOMEM;
1e1be432 TI	429	}
43b62713 TI	430	hint->key = key;
43b62713 TI	431	hint->val = val;
4ea6fbc8 TI	432	return 0;
	433	}
	434
	435	static ssize_t hints_store(struct device *dev,
	436	struct device_attribute *attr,
	437	const char *buf, size_t count)
	438	{
	439	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	440	struct hda_codec *codec = hwdep->private_data;
	441	int err = parse_hints(codec, buf);
	442	if (err < 0)
	443	return err;
1e1be432 TI	444	return count;
	445	}
	446
3be14149 TI	447	static ssize_t pin_configs_show(struct hda_codec *codec,
	448	struct snd_array *list,
	449	char *buf)
	450	{
	451	int i, len = 0;
	452	for (i = 0; i < list->used; i++) {
	453	struct hda_pincfg *pin = snd_array_elem(list, i);
	454	len += sprintf(buf + len, "0x%02x 0x%08x\n",
	455	pin->nid, pin->cfg);
	456	}
	457	return len;
	458	}
	459
	460	static ssize_t init_pin_configs_show(struct device *dev,
	461	struct device_attribute *attr,
	462	char *buf)
	463	{
	464	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	465	struct hda_codec *codec = hwdep->private_data;
	466	return pin_configs_show(codec, &codec->init_pins, buf);
	467	}
	468
346ff70f TI	469	static ssize_t user_pin_configs_show(struct device *dev,
	470	struct device_attribute *attr,
	471	char *buf)
3be14149 TI	472	{
	473	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	474	struct hda_codec *codec = hwdep->private_data;
346ff70f	475	return pin_configs_show(codec, &codec->user_pins, buf);
3be14149 TI	476	}
3be14149 TI	477
346ff70f TI	478	static ssize_t driver_pin_configs_show(struct device *dev,
	479	struct device_attribute *attr,
	480	char *buf)
3be14149 TI	481	{
	482	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	483	struct hda_codec *codec = hwdep->private_data;
346ff70f	484	return pin_configs_show(codec, &codec->driver_pins, buf);
3be14149 TI	485	}
	486
	487	#define MAX_PIN_CONFIGS 32
	488
4ea6fbc8	489	static int parse_user_pin_configs(struct hda_codec codec, const char buf)
3be14149	490	{
3be14149	491	int nid, cfg;
3be14149 TI	492
	493	if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
	494	return -EINVAL;
	495	if (!nid)
	496	return -EINVAL;
4ea6fbc8 TI	497	return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
	498	}
	499
	500	static ssize_t user_pin_configs_store(struct device *dev,
	501	struct device_attribute *attr,
	502	const char *buf, size_t count)
	503	{
	504	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	505	struct hda_codec *codec = hwdep->private_data;
	506	int err = parse_user_pin_configs(codec, buf);
3be14149 TI	507	if (err < 0)
	508	return err;
	509	return count;
	510	}
	511
d7ffba19 TI	512	#define CODEC_ATTR_RW(type) \
	513	__ATTR(type, 0644, type##_show, type##_store)
	514	#define CODEC_ATTR_RO(type) \
	515	__ATTR_RO(type)
	516	#define CODEC_ATTR_WO(type) \
	517	__ATTR(type, 0200, NULL, type##_store)
	518
	519	static struct device_attribute codec_attrs[] = {
	520	CODEC_ATTR_RW(vendor_id),
	521	CODEC_ATTR_RW(subsystem_id),
	522	CODEC_ATTR_RW(revision_id),
	523	CODEC_ATTR_RO(afg),
	524	CODEC_ATTR_RO(mfg),
812a2cca TI	525	CODEC_ATTR_RW(vendor_name),
812a2cca TI	526	CODEC_ATTR_RW(chip_name),
d7ffba19	527	CODEC_ATTR_RW(modelname),
ab1726f9 TI	528	CODEC_ATTR_RW(init_verbs),
ab1726f9 TI	529	CODEC_ATTR_RW(hints),
3be14149	530	CODEC_ATTR_RO(init_pin_configs),
346ff70f TI	531	CODEC_ATTR_RW(user_pin_configs),
346ff70f TI	532	CODEC_ATTR_RO(driver_pin_configs),
d7ffba19 TI	533	CODEC_ATTR_WO(reconfig),
	534	CODEC_ATTR_WO(clear),
	535	};
	536
	537	/*
	538	* create sysfs files on hwdep directory
	539	*/
	540	int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
	541	{
	542	struct snd_hwdep *hwdep = codec->hwdep;
	543	int i;
	544
	545	for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
	546	snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
	547	hwdep->device, &codec_attrs[i]);
	548	return 0;
	549	}
e7ee058c	550
43b62713 TI	551	/*
	552	* Look for hint string
	553	*/
	554	const char snd_hda_get_hint(struct hda_codec codec, const char *key)
	555	{
	556	struct hda_hint *hint = get_hint(codec, key);
	557	return hint ? hint->val : NULL;
	558	}
	559	EXPORT_SYMBOL_HDA(snd_hda_get_hint);
	560
	561	int snd_hda_get_bool_hint(struct hda_codec codec, const char key)
	562	{
	563	const char *p = snd_hda_get_hint(codec, key);
	564	if (!p \|\| !*p)
	565	return -ENOENT;
	566	switch (toupper(*p)) {
	567	case 'T': /* true */
	568	case 'Y': /* yes */
	569	case '1':
	570	return 1;
	571	}
	572	return 0;
	573	}
	574	EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
	575
e7ee058c	576	#endif /* CONFIG_SND_HDA_RECONFIG */
4ea6fbc8 TI	577
	578	#ifdef CONFIG_SND_HDA_PATCH_LOADER
	579
	580	/* parser mode */
	581	enum {
	582	LINE_MODE_NONE,
	583	LINE_MODE_CODEC,
	584	LINE_MODE_MODEL,
	585	LINE_MODE_PINCFG,
	586	LINE_MODE_VERB,
	587	LINE_MODE_HINT,
	588	NUM_LINE_MODES,
	589	};
	590
	591	static inline int strmatch(const char a, const char b)
	592	{
	593	return strnicmp(a, b, strlen(b)) == 0;
	594	}
	595
	596	/* parse the contents after the line "[codec]"
	597	* accept only the line with three numbers, and assign the current codec
	598	*/
	599	static void parse_codec_mode(char buf, struct hda_bus bus,
	600	struct hda_codec **codecp)
	601	{
	602	unsigned int vendorid, subid, caddr;
	603	struct hda_codec *codec;
	604
	605	*codecp = NULL;
	606	if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
	607	list_for_each_entry(codec, &bus->codec_list, list) {
	608	if (codec->addr == caddr) {
	609	*codecp = codec;
	610	break;
	611	}
	612	}
	613	}
	614	}
	615
	616	/* parse the contents after the other command tags, [pincfg], [verb],
	617	* [hint] and [model]
	618	* just pass to the sysfs helper (only when any codec was specified)
	619	*/
	620	static void parse_pincfg_mode(char buf, struct hda_bus bus,
	621	struct hda_codec **codecp)
	622	{
	623	if (!*codecp)
	624	return;
	625	parse_user_pin_configs(*codecp, buf);
	626	}
	627
	628	static void parse_verb_mode(char buf, struct hda_bus bus,
	629	struct hda_codec **codecp)
	630	{
	631	if (!*codecp)
	632	return;
	633	parse_init_verbs(*codecp, buf);
	634	}
	635
	636	static void parse_hint_mode(char buf, struct hda_bus bus,
	637	struct hda_codec **codecp)
	638	{
	639	if (!*codecp)
	640	return;
641	parse_hints(*codecp, buf);
642	}
643
644	static void parse_model_mode(char buf, struct hda_bus bus,
645	struct hda_codec **codecp)
646	{
647	if (!*codecp)
648	return;
649	kfree((*codecp)->modelname);
650	(*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
651	}
652
653	struct hda_patch_item {
654	const char *tag;
655	void (parser)(char buf, struct hda_bus bus, struct hda_codec *retc);
656	};
657
658	static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
659	[LINE_MODE_CODEC] = { "[codec]", parse_codec_mode },
660	[LINE_MODE_MODEL] = { "[model]", parse_model_mode },
661	[LINE_MODE_VERB] = { "[verb]", parse_verb_mode },
662	[LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode },
663	[LINE_MODE_HINT] = { "[hint]", parse_hint_mode },
664	};
665
666	/* check the line starting with '[' -- change the parser mode accodingly */
667	static int parse_line_mode(char buf, struct hda_bus bus)
668	{
669	int i;
670	for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
671	if (!patch_items[i].tag)
672	continue;
673	if (strmatch(buf, patch_items[i].tag))
674	return i;
675	}
676	return LINE_MODE_NONE;
677	}
678
679	/* copy one line from the buffer in fw, and update the fields in fw
680	* return zero if it reaches to the end of the buffer, or non-zero
681	* if successfully copied a line
682	*
683	* the spaces at the beginning and the end of the line are stripped
684	*/
685	static int get_line_from_fw(char buf, int size, struct firmware fw)
686	{
687	int len;
688	const char *p = fw->data;
689	while (isspace(*p) && fw->size) {
690	p++;
691	fw->size--;
692	}
693	if (!fw->size)
694	return 0;
695	if (size < fw->size)
696	size = fw->size;
697
698	for (len = 0; len < fw->size; len++) {
699	if (!*p)
700	break;
701	if (*p == '\n') {
702	p++;
703	len++;
704	break;
705	}
706	if (len < size)
707	buf++ = p++;
708	}
709	*buf = 0;
710	fw->size -= len;
711	fw->data = p;
712	remove_trail_spaces(buf);
713	return 1;
714	}
715
716	/*
717	* load a "patch" firmware file and parse it
718	*/
719	int snd_hda_load_patch(struct hda_bus bus, const char patch)
720	{
721	int err;
722	const struct firmware *fw;
723	struct firmware tmp;
724	char buf[128];
725	struct hda_codec *codec;
726	int line_mode;
727	struct device *dev = bus->card->dev;
728
729	if (snd_BUG_ON(!dev))
730	return -ENODEV;
731	err = request_firmware(&fw, patch, dev);
732	if (err < 0) {
733	printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
734	patch);
735	return err;
736	}
737
738	tmp = *fw;
739	line_mode = LINE_MODE_NONE;
740	codec = NULL;
741	while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
742	if (!buf \|\| buf == '#' \|\| *buf == '\n')
743	continue;
744	if (*buf == '[')
745	line_mode = parse_line_mode(buf, bus);
746	else if (patch_items[line_mode].parser)
747	patch_items[line_mode].parser(buf, bus, &codec);
748	}
749	release_firmware(fw);
750	return 0;
751	}
752	EXPORT_SYMBOL_HDA(snd_hda_load_patch);
753	#endif /* CONFIG_SND_HDA_PATCH_LOADER */