[mirror_ubuntu-artful-kernel.git] / drivers / base / regmap / regmap.c

/*
 * Register map access API
 *
 * Copyright 2011 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/err.h>

#define CREATE_TRACE_POINTS
#include <trace/events/regmap.h>

#include "internal.h"

static void regmap_format_4_12_write(struct regmap *map,
				     unsigned int reg, unsigned int val)
{
	__be16 *out = map->work_buf;
	*out = cpu_to_be16((reg << 12) | val);
}

static void regmap_format_7_9_write(struct regmap *map,
				    unsigned int reg, unsigned int val)
{
	__be16 *out = map->work_buf;
	*out = cpu_to_be16((reg << 9) | val);
}

static void regmap_format_8(void *buf, unsigned int val)
{
	u8 *b = buf;

	b[0] = val;
}

static void regmap_format_16(void *buf, unsigned int val)
{
	__be16 *b = buf;

	b[0] = cpu_to_be16(val);
}

static unsigned int regmap_parse_8(void *buf)
{
	u8 *b = buf;

	return b[0];
}

static unsigned int regmap_parse_16(void *buf)
{
	__be16 *b = buf;

	b[0] = be16_to_cpu(b[0]);

	return b[0];
}

/**
 * regmap_init(): Initialise register map
 *
 * @dev: Device that will be interacted with
 * @bus: Bus-specific callbacks to use with device
 * @config: Configuration for register map
 *
 * The return value will be an ERR_PTR() on error or a valid pointer to
 * a struct regmap.  This function should generally not be called
 * directly, it should be called by bus-specific init functions.
 */
struct regmap *regmap_init(struct device *dev,
			   const struct regmap_bus *bus,
			   const struct regmap_config *config)
{
	struct regmap *map;
	int ret = -EINVAL;

	if (!bus || !config)
		return NULL;

	map = kzalloc(sizeof(*map), GFP_KERNEL);
	if (map == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	mutex_init(&map->lock);
	map->format.buf_size = (config->reg_bits + config->val_bits) / 8;
	map->format.reg_bytes = config->reg_bits / 8;
	map->format.val_bytes = config->val_bits / 8;
	map->dev = dev;
	map->bus = bus;
	map->max_register = config->max_register;
	map->writeable_reg = config->writeable_reg;
	map->readable_reg = config->readable_reg;
	map->volatile_reg = config->volatile_reg;
	map->precious_reg = config->precious_reg;

	switch (config->reg_bits) {
	case 4:
		switch (config->val_bits) {
		case 12:
			map->format.format_write = regmap_format_4_12_write;
			break;
		default:
			goto err_map;
		}
		break;

	case 7:
		switch (config->val_bits) {
		case 9:
			map->format.format_write = regmap_format_7_9_write;
			break;
		default:
			goto err_map;
		}
		break;

	case 8:
		map->format.format_reg = regmap_format_8;
		break;

	case 16:
		map->format.format_reg = regmap_format_16;
		break;

	default:
		goto err_map;
	}

	switch (config->val_bits) {
	case 8:
		map->format.format_val = regmap_format_8;
		map->format.parse_val = regmap_parse_8;
		break;
	case 16:
		map->format.format_val = regmap_format_16;
		map->format.parse_val = regmap_parse_16;
		break;
	}

	if (!map->format.format_write &&
	    !(map->format.format_reg && map->format.format_val))
		goto err_map;

	map->work_buf = kmalloc(map->format.buf_size, GFP_KERNEL);
	if (map->work_buf == NULL) {
		ret = -ENOMEM;
		goto err_bus;
	}

	regmap_debugfs_init(map);

	return map;

err_bus:
	module_put(map->bus->owner);
err_map:
	kfree(map);
err:
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(regmap_init);

/**
 * regmap_exit(): Free a previously allocated register map
 */
void regmap_exit(struct regmap *map)
{
	regmap_debugfs_exit(map);
	kfree(map->work_buf);
	module_put(map->bus->owner);
	kfree(map);
}
EXPORT_SYMBOL_GPL(regmap_exit);

static int _regmap_raw_write(struct regmap *map, unsigned int reg,
			     const void *val, size_t val_len)
{
	void *buf;
	int ret = -ENOTSUPP;
	size_t len;
	int i;

	/* Check for unwritable registers before we start */
	if (map->writeable_reg)
		for (i = 0; i < val_len / map->format.val_bytes; i++)
			if (!map->writeable_reg(map->dev, reg + i))
				return -EINVAL;

	map->format.format_reg(map->work_buf, reg);

	trace_regmap_hw_write_start(map->dev, reg,
				    val_len / map->format.val_bytes);

	/* If we're doing a single register write we can probably just
	 * send the work_buf directly, otherwise try to do a gather
	 * write.
	 */
	if (val == map->work_buf + map->format.reg_bytes)
		ret = map->bus->write(map->dev, map->work_buf,
				      map->format.reg_bytes + val_len);
	else if (map->bus->gather_write)
		ret = map->bus->gather_write(map->dev, map->work_buf,
					     map->format.reg_bytes,
					     val, val_len);

	/* If that didn't work fall back on linearising by hand. */
	if (ret == -ENOTSUPP) {
		len = map->format.reg_bytes + val_len;
		buf = kmalloc(len, GFP_KERNEL);
		if (!buf)
			return -ENOMEM;

		memcpy(buf, map->work_buf, map->format.reg_bytes);
		memcpy(buf + map->format.reg_bytes, val, val_len);
		ret = map->bus->write(map->dev, buf, len);

		kfree(buf);
	}

	trace_regmap_hw_write_done(map->dev, reg,
				   val_len / map->format.val_bytes);

	return ret;
}

static int _regmap_write(struct regmap *map, unsigned int reg,
			 unsigned int val)
{
	int ret;
	BUG_ON(!map->format.format_write && !map->format.format_val);

	trace_regmap_reg_write(map->dev, reg, val);

	if (map->format.format_write) {
		map->format.format_write(map, reg, val);

		trace_regmap_hw_write_start(map->dev, reg, 1);

		ret = map->bus->write(map->dev, map->work_buf,
				      map->format.buf_size);

		trace_regmap_hw_write_done(map->dev, reg, 1);

		return ret;
	} else {
		map->format.format_val(map->work_buf + map->format.reg_bytes,
				       val);
		return _regmap_raw_write(map, reg,
					 map->work_buf + map->format.reg_bytes,
					 map->format.val_bytes);
	}
}

/**
 * regmap_write(): Write a value to a single register
 *
 * @map: Register map to write to
 * @reg: Register to write to
 * @val: Value to be written
 *
 * A value of zero will be returned on success, a negative errno will
 * be returned in error cases.
 */
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
{
	int ret;

	mutex_lock(&map->lock);

	ret = _regmap_write(map, reg, val);

	mutex_unlock(&map->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(regmap_write);

/**
 * regmap_raw_write(): Write raw values to one or more registers
 *
 * @map: Register map to write to
 * @reg: Initial register to write to
 * @val: Block of data to be written, laid out for direct transmission to the
 *       device
 * @val_len: Length of data pointed to by val.
 *
 * This function is intended to be used for things like firmware
 * download where a large block of data needs to be transferred to the
 * device.  No formatting will be done on the data provided.
 *
 * A value of zero will be returned on success, a negative errno will
 * be returned in error cases.
 */
int regmap_raw_write(struct regmap *map, unsigned int reg,
		     const void *val, size_t val_len)
{
	int ret;

	mutex_lock(&map->lock);

	ret = _regmap_raw_write(map, reg, val, val_len);

	mutex_unlock(&map->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(regmap_raw_write);

static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
			    unsigned int val_len)
{
	u8 *u8 = map->work_buf;
	int ret;

	map->format.format_reg(map->work_buf, reg);

	/*
	 * Some buses flag reads by setting the high bits in the
	 * register addresss; since it's always the high bits for all
	 * current formats we can do this here rather than in
	 * formatting.  This may break if we get interesting formats.
	 */
	if (map->bus->read_flag_mask)
		u8[0] |= map->bus->read_flag_mask;

	trace_regmap_hw_read_start(map->dev, reg,
				   val_len / map->format.val_bytes);

	ret = map->bus->read(map->dev, map->work_buf, map->format.reg_bytes,
			     val, val_len);

	trace_regmap_hw_read_done(map->dev, reg,
				  val_len / map->format.val_bytes);

	return ret;
}

static int _regmap_read(struct regmap *map, unsigned int reg,
			unsigned int *val)
{
	int ret;

	if (!map->format.parse_val)
		return -EINVAL;

	ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
	if (ret == 0) {
		*val = map->format.parse_val(map->work_buf);
		trace_regmap_reg_read(map->dev, reg, *val);
	}

	return ret;
}

/**
 * regmap_read(): Read a value from a single register
 *
 * @map: Register map to write to
 * @reg: Register to be read from
 * @val: Pointer to store read value
 *
 * A value of zero will be returned on success, a negative errno will
 * be returned in error cases.
 */
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
{
	int ret;

	mutex_lock(&map->lock);

	ret = _regmap_read(map, reg, val);

	mutex_unlock(&map->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(regmap_read);

/**
 * regmap_raw_read(): Read raw data from the device
 *
 * @map: Register map to write to
 * @reg: First register to be read from
 * @val: Pointer to store read value
 * @val_len: Size of data to read
 *
 * A value of zero will be returned on success, a negative errno will
 * be returned in error cases.
 */
int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
		    size_t val_len)
{
	int ret;

	mutex_lock(&map->lock);

	ret = _regmap_raw_read(map, reg, val, val_len);

	mutex_unlock(&map->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(regmap_raw_read);

/**
 * regmap_bulk_read(): Read multiple registers from the device
 *
 * @map: Register map to write to
 * @reg: First register to be read from
 * @val: Pointer to store read value, in native register size for device
 * @val_count: Number of registers to read
 *
 * A value of zero will be returned on success, a negative errno will
 * be returned in error cases.
 */
int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
		     size_t val_count)
{
	int ret, i;
	size_t val_bytes = map->format.val_bytes;

	if (!map->format.parse_val)
		return -EINVAL;

	ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
	if (ret != 0)
		return ret;

	for (i = 0; i < val_count * val_bytes; i += val_bytes)
		map->format.parse_val(val + i);

	return 0;
}
EXPORT_SYMBOL_GPL(regmap_bulk_read);

/**
 * remap_update_bits: Perform a read/modify/write cycle on the register map
 *
 * @map: Register map to update
 * @reg: Register to update
 * @mask: Bitmask to change
 * @val: New value for bitmask
 *
 * Returns zero for success, a negative number on error.
 */
int regmap_update_bits(struct regmap *map, unsigned int reg,
		       unsigned int mask, unsigned int val)
{
	int ret;
	unsigned int tmp;

	mutex_lock(&map->lock);

	ret = _regmap_read(map, reg, &tmp);
	if (ret != 0)
		goto out;

	tmp &= ~mask;
	tmp |= val & mask;

	ret = _regmap_write(map, reg, tmp);

out:
	mutex_unlock(&map->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(regmap_update_bits);

static int __init regmap_initcall(void)
{
	regmap_debugfs_initcall();

	return 0;
}
postcore_initcall(regmap_initcall);
Commit	Line	Data
b83a313b MB	1	/*
	2	* Register map access API
	3	*
	4	* Copyright 2011 Wolfson Microelectronics plc
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/slab.h>
	14	#include <linux/module.h>
	15	#include <linux/mutex.h>
	16	#include <linux/err.h>
	17
fb2736bb MB	18	#define CREATE_TRACE_POINTS
	19	#include <trace/events/regmap.h>
	20
93de9124	21	#include "internal.h"
b83a313b MB	22
	23	static void regmap_format_4_12_write(struct regmap *map,
	24	unsigned int reg, unsigned int val)
	25	{
	26	__be16 *out = map->work_buf;
	27	*out = cpu_to_be16((reg << 12) \| val);
	28	}
	29
	30	static void regmap_format_7_9_write(struct regmap *map,
	31	unsigned int reg, unsigned int val)
	32	{
	33	__be16 *out = map->work_buf;
	34	*out = cpu_to_be16((reg << 9) \| val);
	35	}
	36
	37	static void regmap_format_8(void *buf, unsigned int val)
	38	{
	39	u8 *b = buf;
	40
	41	b[0] = val;
	42	}
	43
	44	static void regmap_format_16(void *buf, unsigned int val)
	45	{
	46	__be16 *b = buf;
	47
	48	b[0] = cpu_to_be16(val);
	49	}
	50
	51	static unsigned int regmap_parse_8(void *buf)
	52	{
	53	u8 *b = buf;
	54
	55	return b[0];
	56	}
	57
	58	static unsigned int regmap_parse_16(void *buf)
	59	{
	60	__be16 *b = buf;
	61
	62	b[0] = be16_to_cpu(b[0]);
	63
	64	return b[0];
	65	}
	66
	67	/**
	68	* regmap_init(): Initialise register map
	69	*
	70	* @dev: Device that will be interacted with
	71	* @bus: Bus-specific callbacks to use with device
	72	* @config: Configuration for register map
	73	*
	74	* The return value will be an ERR_PTR() on error or a valid pointer to
	75	* a struct regmap. This function should generally not be called
	76	* directly, it should be called by bus-specific init functions.
	77	*/
	78	struct regmap regmap_init(struct device dev,
	79	const struct regmap_bus *bus,
	80	const struct regmap_config *config)
	81	{
	82	struct regmap *map;
	83	int ret = -EINVAL;
	84
	85	if (!bus \|\| !config)
86	return NULL;
87
88	map = kzalloc(sizeof(*map), GFP_KERNEL);
89	if (map == NULL) {
90	ret = -ENOMEM;
91	goto err;
92	}
93
94	mutex_init(&map->lock);
95	map->format.buf_size = (config->reg_bits + config->val_bits) / 8;
96	map->format.reg_bytes = config->reg_bits / 8;
97	map->format.val_bytes = config->val_bits / 8;
98	map->dev = dev;
99	map->bus = bus;
2e2ae66d MB	100	map->max_register = config->max_register;
	101	map->writeable_reg = config->writeable_reg;
	102	map->readable_reg = config->readable_reg;
	103	map->volatile_reg = config->volatile_reg;
2efe1642	104	map->precious_reg = config->precious_reg;
b83a313b MB	105
	106	switch (config->reg_bits) {
	107	case 4:
	108	switch (config->val_bits) {
	109	case 12:
	110	map->format.format_write = regmap_format_4_12_write;
	111	break;
	112	default:
	113	goto err_map;
	114	}
	115	break;
	116
	117	case 7:
	118	switch (config->val_bits) {
	119	case 9:
	120	map->format.format_write = regmap_format_7_9_write;
	121	break;
	122	default:
	123	goto err_map;
	124	}
	125	break;
	126
	127	case 8:
	128	map->format.format_reg = regmap_format_8;
	129	break;
	130
	131	case 16:
	132	map->format.format_reg = regmap_format_16;
	133	break;
	134
	135	default:
	136	goto err_map;
	137	}
	138
	139	switch (config->val_bits) {
	140	case 8:
	141	map->format.format_val = regmap_format_8;
	142	map->format.parse_val = regmap_parse_8;
	143	break;
	144	case 16:
	145	map->format.format_val = regmap_format_16;
	146	map->format.parse_val = regmap_parse_16;
	147	break;
	148	}
	149
	150	if (!map->format.format_write &&
	151	!(map->format.format_reg && map->format.format_val))
	152	goto err_map;
	153
	154	map->work_buf = kmalloc(map->format.buf_size, GFP_KERNEL);
	155	if (map->work_buf == NULL) {
	156	ret = -ENOMEM;
	157	goto err_bus;
	158	}
	159
31244e39 MB	160	regmap_debugfs_init(map);
31244e39 MB	161
b83a313b MB	162	return map;
	163
	164	err_bus:
	165	module_put(map->bus->owner);
	166	err_map:
	167	kfree(map);
	168	err:
	169	return ERR_PTR(ret);
	170	}
	171	EXPORT_SYMBOL_GPL(regmap_init);
	172
	173	/**
	174	* regmap_exit(): Free a previously allocated register map
	175	*/
	176	void regmap_exit(struct regmap *map)
	177	{
31244e39	178	regmap_debugfs_exit(map);
b83a313b MB	179	kfree(map->work_buf);
	180	module_put(map->bus->owner);
	181	kfree(map);
	182	}
	183	EXPORT_SYMBOL_GPL(regmap_exit);
	184
	185	static int _regmap_raw_write(struct regmap *map, unsigned int reg,
	186	const void *val, size_t val_len)
	187	{
	188	void *buf;
	189	int ret = -ENOTSUPP;
	190	size_t len;
73304781 MB	191	int i;
	192
	193	/* Check for unwritable registers before we start */
	194	if (map->writeable_reg)
	195	for (i = 0; i < val_len / map->format.val_bytes; i++)
	196	if (!map->writeable_reg(map->dev, reg + i))
	197	return -EINVAL;
b83a313b MB	198
	199	map->format.format_reg(map->work_buf, reg);
	200
fb2736bb MB	201	trace_regmap_hw_write_start(map->dev, reg,
	202	val_len / map->format.val_bytes);
	203
2547e201 MB	204	/* If we're doing a single register write we can probably just
	205	* send the work_buf directly, otherwise try to do a gather
	206	* write.
	207	*/
	208	if (val == map->work_buf + map->format.reg_bytes)
	209	ret = map->bus->write(map->dev, map->work_buf,
	210	map->format.reg_bytes + val_len);
	211	else if (map->bus->gather_write)
b83a313b MB	212	ret = map->bus->gather_write(map->dev, map->work_buf,
	213	map->format.reg_bytes,
	214	val, val_len);
	215
2547e201	216	/* If that didn't work fall back on linearising by hand. */
b83a313b MB	217	if (ret == -ENOTSUPP) {
	218	len = map->format.reg_bytes + val_len;
	219	buf = kmalloc(len, GFP_KERNEL);
	220	if (!buf)
	221	return -ENOMEM;
	222
	223	memcpy(buf, map->work_buf, map->format.reg_bytes);
	224	memcpy(buf + map->format.reg_bytes, val, val_len);
	225	ret = map->bus->write(map->dev, buf, len);
	226
	227	kfree(buf);
	228	}
	229
fb2736bb MB	230	trace_regmap_hw_write_done(map->dev, reg,
	231	val_len / map->format.val_bytes);
	232
b83a313b MB	233	return ret;
	234	}
	235
	236	static int _regmap_write(struct regmap *map, unsigned int reg,
	237	unsigned int val)
	238	{
fb2736bb	239	int ret;
b83a313b MB	240	BUG_ON(!map->format.format_write && !map->format.format_val);
b83a313b MB	241
fb2736bb MB	242	trace_regmap_reg_write(map->dev, reg, val);
fb2736bb MB	243
b83a313b MB	244	if (map->format.format_write) {
	245	map->format.format_write(map, reg, val);
	246
fb2736bb MB	247	trace_regmap_hw_write_start(map->dev, reg, 1);
	248
	249	ret = map->bus->write(map->dev, map->work_buf,
	250	map->format.buf_size);
	251
	252	trace_regmap_hw_write_done(map->dev, reg, 1);
	253
	254	return ret;
b83a313b MB	255	} else {
	256	map->format.format_val(map->work_buf + map->format.reg_bytes,
	257	val);
	258	return _regmap_raw_write(map, reg,
	259	map->work_buf + map->format.reg_bytes,
	260	map->format.val_bytes);
	261	}
	262	}
	263
	264	/**
	265	* regmap_write(): Write a value to a single register
	266	*
	267	* @map: Register map to write to
	268	* @reg: Register to write to
	269	* @val: Value to be written
	270	*
	271	* A value of zero will be returned on success, a negative errno will
	272	* be returned in error cases.
	273	*/
	274	int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
	275	{
	276	int ret;
	277
	278	mutex_lock(&map->lock);
	279
	280	ret = _regmap_write(map, reg, val);
	281
	282	mutex_unlock(&map->lock);
	283
	284	return ret;
	285	}
	286	EXPORT_SYMBOL_GPL(regmap_write);
	287
	288	/**
	289	* regmap_raw_write(): Write raw values to one or more registers
	290	*
	291	* @map: Register map to write to
	292	* @reg: Initial register to write to
	293	* @val: Block of data to be written, laid out for direct transmission to the
	294	* device
	295	* @val_len: Length of data pointed to by val.
	296	*
	297	* This function is intended to be used for things like firmware
	298	* download where a large block of data needs to be transferred to the
	299	* device. No formatting will be done on the data provided.
	300	*
	301	* A value of zero will be returned on success, a negative errno will
	302	* be returned in error cases.
	303	*/
	304	int regmap_raw_write(struct regmap *map, unsigned int reg,
	305	const void *val, size_t val_len)
	306	{
	307	int ret;
	308
	309	mutex_lock(&map->lock);
	310
	311	ret = _regmap_raw_write(map, reg, val, val_len);
	312
	313	mutex_unlock(&map->lock);
	314
	315	return ret;
	316	}
	317	EXPORT_SYMBOL_GPL(regmap_raw_write);
	318
319	static int _regmap_raw_read(struct regmap map, unsigned int reg, void val,
320	unsigned int val_len)
321	{
322	u8 *u8 = map->work_buf;
323	int ret;
324
325	map->format.format_reg(map->work_buf, reg);
326
327	/*
328	* Some buses flag reads by setting the high bits in the
329	* register addresss; since it's always the high bits for all
330	* current formats we can do this here rather than in
331	* formatting. This may break if we get interesting formats.
332	*/
333	if (map->bus->read_flag_mask)
334	u8[0] \|= map->bus->read_flag_mask;
335
fb2736bb MB	336	trace_regmap_hw_read_start(map->dev, reg,
	337	val_len / map->format.val_bytes);
	338
b83a313b	339	ret = map->bus->read(map->dev, map->work_buf, map->format.reg_bytes,
40c5cc26	340	val, val_len);
b83a313b	341
fb2736bb MB	342	trace_regmap_hw_read_done(map->dev, reg,
	343	val_len / map->format.val_bytes);
	344
	345	return ret;
b83a313b MB	346	}
	347
	348	static int _regmap_read(struct regmap *map, unsigned int reg,
	349	unsigned int *val)
	350	{
	351	int ret;
	352
	353	if (!map->format.parse_val)
	354	return -EINVAL;
	355
	356	ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
fb2736bb	357	if (ret == 0) {
b83a313b	358	*val = map->format.parse_val(map->work_buf);
fb2736bb MB	359	trace_regmap_reg_read(map->dev, reg, *val);
fb2736bb MB	360	}
b83a313b MB	361
	362	return ret;
	363	}
	364
	365	/**
	366	* regmap_read(): Read a value from a single register
	367	*
	368	* @map: Register map to write to
	369	* @reg: Register to be read from
	370	* @val: Pointer to store read value
	371	*
	372	* A value of zero will be returned on success, a negative errno will
	373	* be returned in error cases.
	374	*/
	375	int regmap_read(struct regmap map, unsigned int reg, unsigned int val)
	376	{
	377	int ret;
	378
	379	mutex_lock(&map->lock);
	380
	381	ret = _regmap_read(map, reg, val);
	382
	383	mutex_unlock(&map->lock);
	384
	385	return ret;
	386	}
	387	EXPORT_SYMBOL_GPL(regmap_read);
	388
	389	/**
	390	* regmap_raw_read(): Read raw data from the device
	391	*
	392	* @map: Register map to write to
	393	* @reg: First register to be read from
	394	* @val: Pointer to store read value
	395	* @val_len: Size of data to read
	396	*
	397	* A value of zero will be returned on success, a negative errno will
	398	* be returned in error cases.
	399	*/
	400	int regmap_raw_read(struct regmap map, unsigned int reg, void val,
	401	size_t val_len)
	402	{
	403	int ret;
	404
	405	mutex_lock(&map->lock);
	406
	407	ret = _regmap_raw_read(map, reg, val, val_len);
	408
	409	mutex_unlock(&map->lock);
	410
	411	return ret;
	412	}
	413	EXPORT_SYMBOL_GPL(regmap_raw_read);
	414
	415	/**
	416	* regmap_bulk_read(): Read multiple registers from the device
	417	*
	418	* @map: Register map to write to
	419	* @reg: First register to be read from
	420	* @val: Pointer to store read value, in native register size for device
	421	* @val_count: Number of registers to read
	422	*
	423	* A value of zero will be returned on success, a negative errno will
	424	* be returned in error cases.
425	*/
426	int regmap_bulk_read(struct regmap map, unsigned int reg, void val,
427	size_t val_count)
428	{
429	int ret, i;
430	size_t val_bytes = map->format.val_bytes;
431
432	if (!map->format.parse_val)
433	return -EINVAL;
434
435	ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
436	if (ret != 0)
437	return ret;
438
439	for (i = 0; i < val_count * val_bytes; i += val_bytes)
440	map->format.parse_val(val + i);
441
442	return 0;
443	}
444	EXPORT_SYMBOL_GPL(regmap_bulk_read);
445
446	/**
447	* remap_update_bits: Perform a read/modify/write cycle on the register map
448	*
449	* @map: Register map to update
450	* @reg: Register to update
451	* @mask: Bitmask to change
452	* @val: New value for bitmask
453	*
454	* Returns zero for success, a negative number on error.
455	*/
456	int regmap_update_bits(struct regmap *map, unsigned int reg,
457	unsigned int mask, unsigned int val)
458	{
459	int ret;
460	unsigned int tmp;
461
462	mutex_lock(&map->lock);
463
464	ret = _regmap_read(map, reg, &tmp);
465	if (ret != 0)
466	goto out;
467
468	tmp &= ~mask;
469	tmp \|= val & mask;
470
471	ret = _regmap_write(map, reg, tmp);
472
473	out:
474	mutex_unlock(&map->lock);
475
476	return ret;
477	}
478	EXPORT_SYMBOL_GPL(regmap_update_bits);
31244e39 MB	479
	480	static int __init regmap_initcall(void)
	481	{
	482	regmap_debugfs_initcall();
	483
	484	return 0;
	485	}
	486	postcore_initcall(regmap_initcall);