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linux/drivers/base/regmap/regmap.c
Stephen Warren f01ee60fff regmap: implement register striding 
regmap_config.reg_stride is introduced. All extant register addresses
are a multiple of this value. Users of serial-oriented regmap busses will
typically set this to 1. Users of the MMIO regmap bus will typically set
this based on the value size of their registers, in bytes, so 4 for a
32-bit register.

Throughout the regmap code, actual register addresses are used. Wherever
the register address is used to index some array of values, the address
is divided by the stride to determine the index, or vice-versa. Error-
checking is added to all entry-points for register address data to ensure
that register addresses actually satisfy the specified stride. The MMIO
bus ensures that the specified stride is large enough for the register
size.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-04-10 11:01:18 +01:00

1024 lines
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/*
* 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/device.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/err.h>
#define CREATE_TRACE_POINTS
#include <trace/events/regmap.h>
#include "internal.h"
bool regmap_writeable(struct regmap *map, unsigned int reg)
{
if (map->max_register && reg > map->max_register)
return false;
if (map->writeable_reg)
return map->writeable_reg(map->dev, reg);
return true;
}
bool regmap_readable(struct regmap *map, unsigned int reg)
{
if (map->max_register && reg > map->max_register)
return false;
if (map->format.format_write)
return false;
if (map->readable_reg)
return map->readable_reg(map->dev, reg);
return true;
}
bool regmap_volatile(struct regmap *map, unsigned int reg)
{
if (!regmap_readable(map, reg))
return false;
if (map->volatile_reg)
return map->volatile_reg(map->dev, reg);
return true;
}
bool regmap_precious(struct regmap *map, unsigned int reg)
{
if (!regmap_readable(map, reg))
return false;
if (map->precious_reg)
return map->precious_reg(map->dev, reg);
return false;
}
static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
unsigned int num)
{
unsigned int i;
for (i = 0; i < num; i++)
if (!regmap_volatile(map, reg + i))
return false;
return true;
}
static void regmap_format_2_6_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
u8 *out = map->work_buf;
*out = (reg << 6) | val;
}
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_10_14_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
u8 *out = map->work_buf;
out[2] = val;
out[1] = (val >> 8) | (reg << 6);
out[0] = reg >> 2;
}
static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
{
u8 *b = buf;
b[0] = val << shift;
}
static void regmap_format_16(void *buf, unsigned int val, unsigned int shift)
{
__be16 *b = buf;
b[0] = cpu_to_be16(val << shift);
}
static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
{
u8 *b = buf;
val <<= shift;
b[0] = val >> 16;
b[1] = val >> 8;
b[2] = val;
}
static void regmap_format_32(void *buf, unsigned int val, unsigned int shift)
{
__be32 *b = buf;
b[0] = cpu_to_be32(val << shift);
}
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];
}
static unsigned int regmap_parse_24(void *buf)
{
u8 *b = buf;
unsigned int ret = b[2];
ret |= ((unsigned int)b[1]) << 8;
ret |= ((unsigned int)b[0]) << 16;
return ret;
}
static unsigned int regmap_parse_32(void *buf)
{
__be32 *b = buf;
b[0] = be32_to_cpu(b[0]);
return b[0];
}
static void regmap_lock_mutex(struct regmap *map)
{
mutex_lock(&map->mutex);
}
static void regmap_unlock_mutex(struct regmap *map)
{
mutex_unlock(&map->mutex);
}
static void regmap_lock_spinlock(struct regmap *map)
{
spin_lock(&map->spinlock);
}
static void regmap_unlock_spinlock(struct regmap *map)
{
spin_unlock(&map->spinlock);
}
/**
* regmap_init(): Initialise register map
*
* @dev: Device that will be interacted with
* @bus: Bus-specific callbacks to use with device
* @bus_context: Data passed to bus-specific callbacks
* @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,
void *bus_context,
const struct regmap_config *config)
{
struct regmap *map;
int ret = -EINVAL;
if (!bus || !config)
goto err;
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (map == NULL) {
ret = -ENOMEM;
goto err;
}
if (bus->fast_io) {
spin_lock_init(&map->spinlock);
map->lock = regmap_lock_spinlock;
map->unlock = regmap_unlock_spinlock;
} else {
mutex_init(&map->mutex);
map->lock = regmap_lock_mutex;
map->unlock = regmap_unlock_mutex;
}
map->format.buf_size = (config->reg_bits + config->val_bits) / 8;
map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
map->format.pad_bytes = config->pad_bits / 8;
map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
map->format.buf_size += map->format.pad_bytes;
map->reg_shift = config->pad_bits % 8;
if (config->reg_stride)
map->reg_stride = config->reg_stride;
else
map->reg_stride = 1;
map->dev = dev;
map->bus = bus;
map->bus_context = bus_context;
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;
map->cache_type = config->cache_type;
if (config->read_flag_mask || config->write_flag_mask) {
map->read_flag_mask = config->read_flag_mask;
map->write_flag_mask = config->write_flag_mask;
} else {
map->read_flag_mask = bus->read_flag_mask;
}
switch (config->reg_bits + map->reg_shift) {
case 2:
switch (config->val_bits) {
case 6:
map->format.format_write = regmap_format_2_6_write;
break;
default:
goto err_map;
}
break;
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 10:
switch (config->val_bits) {
case 14:
map->format.format_write = regmap_format_10_14_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;
case 32:
map->format.format_reg = regmap_format_32;
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;
case 24:
map->format.format_val = regmap_format_24;
map->format.parse_val = regmap_parse_24;
break;
case 32:
map->format.format_val = regmap_format_32;
map->format.parse_val = regmap_parse_32;
break;
}
if (!map->format.format_write &&
!(map->format.format_reg && map->format.format_val))
goto err_map;
map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
if (map->work_buf == NULL) {
ret = -ENOMEM;
goto err_map;
}
regmap_debugfs_init(map, config->name);
ret = regcache_init(map, config);
if (ret < 0)
goto err_free_workbuf;
return map;
err_free_workbuf:
kfree(map->work_buf);
err_map:
kfree(map);
err:
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(regmap_init);
static void devm_regmap_release(struct device *dev, void *res)
{
regmap_exit(*(struct regmap **)res);
}
/**
* devm_regmap_init(): Initialise managed register map
*
* @dev: Device that will be interacted with
* @bus: Bus-specific callbacks to use with device
* @bus_context: Data passed to bus-specific callbacks
* @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. The
* map will be automatically freed by the device management code.
*/
struct regmap *devm_regmap_init(struct device *dev,
const struct regmap_bus *bus,
void *bus_context,
const struct regmap_config *config)
{
struct regmap **ptr, *regmap;
ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
regmap = regmap_init(dev, bus, bus_context, config);
if (!IS_ERR(regmap)) {
*ptr = regmap;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return regmap;
}
EXPORT_SYMBOL_GPL(devm_regmap_init);
/**
* regmap_reinit_cache(): Reinitialise the current register cache
*
* @map: Register map to operate on.
* @config: New configuration. Only the cache data will be used.
*
* Discard any existing register cache for the map and initialize a
* new cache. This can be used to restore the cache to defaults or to
* update the cache configuration to reflect runtime discovery of the
* hardware.
*/
int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
{
int ret;
map->lock(map);
regcache_exit(map);
regmap_debugfs_exit(map);
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;
map->cache_type = config->cache_type;
regmap_debugfs_init(map, config->name);
map->cache_bypass = false;
map->cache_only = false;
ret = regcache_init(map, config);
map->unlock(map);
return ret;
}
/**
* regmap_exit(): Free a previously allocated register map
*/
void regmap_exit(struct regmap *map)
{
regcache_exit(map);
regmap_debugfs_exit(map);
if (map->bus->free_context)
map->bus->free_context(map->bus_context);
kfree(map->work_buf);
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)
{
u8 *u8 = map->work_buf;
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 * map->reg_stride)))
return -EINVAL;
if (!map->cache_bypass && map->format.parse_val) {
unsigned int ival;
int val_bytes = map->format.val_bytes;
for (i = 0; i < val_len / val_bytes; i++) {
memcpy(map->work_buf, val + (i * val_bytes), val_bytes);
ival = map->format.parse_val(map->work_buf);
ret = regcache_write(map, reg + (i * map->reg_stride),
ival);
if (ret) {
dev_err(map->dev,
"Error in caching of register: %u ret: %d\n",
reg + i, ret);
return ret;
}
}
if (map->cache_only) {
map->cache_dirty = true;
return 0;
}
}
map->format.format_reg(map->work_buf, reg, map->reg_shift);
u8[0] |= map->write_flag_mask;
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.pad_bytes +
map->format.reg_bytes))
ret = map->bus->write(map->bus_context, map->work_buf,
map->format.reg_bytes +
map->format.pad_bytes +
val_len);
else if (map->bus->gather_write)
ret = map->bus->gather_write(map->bus_context, map->work_buf,
map->format.reg_bytes +
map->format.pad_bytes,
val, val_len);
/* If that didn't work fall back on linearising by hand. */
if (ret == -ENOTSUPP) {
len = map->format.reg_bytes + map->format.pad_bytes + val_len;
buf = kzalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
memcpy(buf, map->work_buf, map->format.reg_bytes);
memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
val, val_len);
ret = map->bus->write(map->bus_context, buf, len);
kfree(buf);
}
trace_regmap_hw_write_done(map->dev, reg,
val_len / map->format.val_bytes);
return ret;
}
int _regmap_write(struct regmap *map, unsigned int reg,
unsigned int val)
{
int ret;
BUG_ON(!map->format.format_write && !map->format.format_val);
if (!map->cache_bypass && map->format.format_write) {
ret = regcache_write(map, reg, val);
if (ret != 0)
return ret;
if (map->cache_only) {
map->cache_dirty = true;
return 0;
}
}
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->bus_context, 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
+ map->format.pad_bytes, val, 0);
return _regmap_raw_write(map, reg,
map->work_buf +
map->format.reg_bytes +
map->format.pad_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;
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
ret = _regmap_write(map, reg, val);
map->unlock(map);
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;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
ret = _regmap_raw_write(map, reg, val, val_len);
map->unlock(map);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_raw_write);
/*
* regmap_bulk_write(): Write multiple registers to the device
*
* @map: Register map to write to
* @reg: First register to be write from
* @val: Block of data to be written, in native register size for device
* @val_count: Number of registers to write
*
* This function is intended to be used for writing a large block of
* data to be device either in single transfer or multiple transfer.
*
* A value of zero will be returned on success, a negative errno will
* be returned in error cases.
*/
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count)
{
int ret = 0, i;
size_t val_bytes = map->format.val_bytes;
void *wval;
if (!map->format.parse_val)
return -EINVAL;
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
/* No formatting is require if val_byte is 1 */
if (val_bytes == 1) {
wval = (void *)val;
} else {
wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
if (!wval) {
ret = -ENOMEM;
dev_err(map->dev, "Error in memory allocation\n");
goto out;
}
for (i = 0; i < val_count * val_bytes; i += val_bytes)
map->format.parse_val(wval + i);
}
ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
if (val_bytes != 1)
kfree(wval);
out:
map->unlock(map);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_bulk_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, map->reg_shift);
/*
* Some buses or devices 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.
*/
u8[0] |= map->read_flag_mask;
trace_regmap_hw_read_start(map->dev, reg,
val_len / map->format.val_bytes);
ret = map->bus->read(map->bus_context, map->work_buf,
map->format.reg_bytes + map->format.pad_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->cache_bypass) {
ret = regcache_read(map, reg, val);
if (ret == 0)
return 0;
}
if (!map->format.parse_val)
return -EINVAL;
if (map->cache_only)
return -EBUSY;
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;
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
ret = _regmap_read(map, reg, val);
map->unlock(map);
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)
{
size_t val_bytes = map->format.val_bytes;
size_t val_count = val_len / val_bytes;
unsigned int v;
int ret, i;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
map->cache_type == REGCACHE_NONE) {
/* Physical block read if there's no cache involved */
ret = _regmap_raw_read(map, reg, val, val_len);
} else {
/* Otherwise go word by word for the cache; should be low
* cost as we expect to hit the cache.
*/
for (i = 0; i < val_count; i++) {
ret = _regmap_read(map, reg + (i * map->reg_stride),
&v);
if (ret != 0)
goto out;
map->format.format_val(val + (i * val_bytes), v, 0);
}
}
out:
map->unlock(map);
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;
bool vol = regmap_volatile_range(map, reg, val_count);
if (!map->format.parse_val)
return -EINVAL;
if (reg % map->reg_stride)
return -EINVAL;
if (vol || map->cache_type == REGCACHE_NONE) {
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);
} else {
for (i = 0; i < val_count; i++) {
ret = regmap_read(map, reg + (i * map->reg_stride),
val + (i * val_bytes));
if (ret != 0)
return ret;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(regmap_bulk_read);
static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change)
{
int ret;
unsigned int tmp, orig;
map->lock(map);
ret = _regmap_read(map, reg, &orig);
if (ret != 0)
goto out;
tmp = orig & ~mask;
tmp |= val & mask;
if (tmp != orig) {
ret = _regmap_write(map, reg, tmp);
*change = true;
} else {
*change = false;
}
out:
map->unlock(map);
return ret;
}
/**
* regmap_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)
{
bool change;
return _regmap_update_bits(map, reg, mask, val, &change);
}
EXPORT_SYMBOL_GPL(regmap_update_bits);
/**
* regmap_update_bits_check: Perform a read/modify/write cycle on the
* register map and report if updated
*
* @map: Register map to update
* @reg: Register to update
* @mask: Bitmask to change
* @val: New value for bitmask
* @change: Boolean indicating if a write was done
*
* Returns zero for success, a negative number on error.
*/
int regmap_update_bits_check(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change)
{
return _regmap_update_bits(map, reg, mask, val, change);
}
EXPORT_SYMBOL_GPL(regmap_update_bits_check);
/**
* regmap_register_patch: Register and apply register updates to be applied
* on device initialistion
*
* @map: Register map to apply updates to.
* @regs: Values to update.
* @num_regs: Number of entries in regs.
*
* Register a set of register updates to be applied to the device
* whenever the device registers are synchronised with the cache and
* apply them immediately. Typically this is used to apply
* corrections to be applied to the device defaults on startup, such
* as the updates some vendors provide to undocumented registers.
*/
int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
int num_regs)
{
int i, ret;
bool bypass;
/* If needed the implementation can be extended to support this */
if (map->patch)
return -EBUSY;
map->lock(map);
bypass = map->cache_bypass;
map->cache_bypass = true;
/* Write out first; it's useful to apply even if we fail later. */
for (i = 0; i < num_regs; i++) {
ret = _regmap_write(map, regs[i].reg, regs[i].def);
if (ret != 0) {
dev_err(map->dev, "Failed to write %x = %x: %d\n",
regs[i].reg, regs[i].def, ret);
goto out;
}
}
map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL);
if (map->patch != NULL) {
memcpy(map->patch, regs,
num_regs * sizeof(struct reg_default));
map->patch_regs = num_regs;
} else {
ret = -ENOMEM;
}
out:
map->cache_bypass = bypass;
map->unlock(map);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_register_patch);
/*
* regmap_get_val_bytes(): Report the size of a register value
*
* Report the size of a register value, mainly intended to for use by
* generic infrastructure built on top of regmap.
*/
int regmap_get_val_bytes(struct regmap *map)
{
if (map->format.format_write)
return -EINVAL;
return map->format.val_bytes;
}
EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
static int __init regmap_initcall(void)
{
regmap_debugfs_initcall();
return 0;
}
postcore_initcall(regmap_initcall);
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