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linux/sound/soc/soc-cache.c
Dimitris Papastamos a7f387d5af ASoC: soc-cache: Add support for rbtree based register caching 
This patch adds support for rbtree compression when storing the
register cache.  It does this by not adding any uninitialized registers
(those whose value is 0).  If any of those registers is written
with a nonzero value they get added into the rbtree.

Consider a sample device with a large sparse register map.  The
register indices are between [0, 0x31ff].  An array of 12800 registers
is thus created each of which is 2 bytes.  This results in a 25kB
region.  This array normally lives outside soc-core, normally in the
driver itself.  The original soc-core code would kmemdup this region
resulting in 50kB total memory.  When using the rbtree compression
technique and __devinitconst on the original array the figures are
as follows.  For this typical device, you might have 100 initialized
registers, that is registers that are nonzero by default.  We build
an rbtree with 100 nodes, each of which is 24 bytes.  This results
in ~2kB of memory.  Assuming that the target arch can freeup the
memory used by the initial __devinitconst array, we end up using
about ~2kB bytes of actual memory.  The memory footprint will increase
as uninitialized registers get written and thus new nodes created in
the rbtree.  In practice, most of those registers are never changed.
If the target arch can't freeup the __devinitconst array, we end up
using a total of ~27kB.  The difference between the rbtree and the LZO
caching techniques, is that if using the LZO technique the size of
the cache will increase slower as more uninitialized registers get
changed.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2010-11-11 15:59:22 +00:00

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/*
* soc-cache.c -- ASoC register cache helpers
*
* Copyright 2009 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 as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <sound/soc.h>
#include <linux/lzo.h>
#include <linux/bitmap.h>
#include <linux/rbtree.h>
static unsigned int snd_soc_4_12_read(struct snd_soc_codec *codec,
unsigned int reg)
{
int ret;
unsigned int val;
if (reg >= codec->driver->reg_cache_size ||
snd_soc_codec_volatile_register(codec, reg)) {
if (codec->cache_only)
return -1;
BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
ret = snd_soc_cache_read(codec, reg, &val);
if (ret < 0)
return -1;
return val;
}
static int snd_soc_4_12_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 data[2];
int ret;
data[0] = (reg << 4) | ((value >> 8) & 0x000f);
data[1] = value & 0x00ff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
reg < codec->driver->reg_cache_size) {
ret = snd_soc_cache_write(codec, reg, value);
if (ret < 0)
return -1;
}
if (codec->cache_only) {
codec->cache_sync = 1;
return 0;
}
ret = codec->hw_write(codec->control_data, data, 2);
if (ret == 2)
return 0;
if (ret < 0)
return ret;
else
return -EIO;
}
#if defined(CONFIG_SPI_MASTER)
static int snd_soc_4_12_spi_write(void *control_data, const char *data,
int len)
{
struct spi_device *spi = control_data;
struct spi_transfer t;
struct spi_message m;
u8 msg[2];
if (len <= 0)
return 0;
msg[0] = data[1];
msg[1] = data[0];
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = len;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
#else
#define snd_soc_4_12_spi_write NULL
#endif
static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec,
unsigned int reg)
{
int ret;
unsigned int val;
if (reg >= codec->driver->reg_cache_size ||
snd_soc_codec_volatile_register(codec, reg)) {
if (codec->cache_only)
return -1;
BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
ret = snd_soc_cache_read(codec, reg, &val);
if (ret < 0)
return -1;
return val;
}
static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 data[2];
int ret;
data[0] = (reg << 1) | ((value >> 8) & 0x0001);
data[1] = value & 0x00ff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
reg < codec->driver->reg_cache_size) {
ret = snd_soc_cache_write(codec, reg, value);
if (ret < 0)
return -1;
}
if (codec->cache_only) {
codec->cache_sync = 1;
return 0;
}
ret = codec->hw_write(codec->control_data, data, 2);
if (ret == 2)
return 0;
if (ret < 0)
return ret;
else
return -EIO;
}
#if defined(CONFIG_SPI_MASTER)
static int snd_soc_7_9_spi_write(void *control_data, const char *data,
int len)
{
struct spi_device *spi = control_data;
struct spi_transfer t;
struct spi_message m;
u8 msg[2];
if (len <= 0)
return 0;
msg[0] = data[0];
msg[1] = data[1];
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = len;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
#else
#define snd_soc_7_9_spi_write NULL
#endif
static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 data[2];
int ret;
reg &= 0xff;
data[0] = reg;
data[1] = value & 0xff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
reg < codec->driver->reg_cache_size) {
ret = snd_soc_cache_write(codec, reg, value);
if (ret < 0)
return -1;
}
if (codec->cache_only) {
codec->cache_sync = 1;
return 0;
}
if (codec->hw_write(codec->control_data, data, 2) == 2)
return 0;
else
return -EIO;
}
static unsigned int snd_soc_8_8_read(struct snd_soc_codec *codec,
unsigned int reg)
{
int ret;
unsigned int val;
reg &= 0xff;
if (reg >= codec->driver->reg_cache_size ||
snd_soc_codec_volatile_register(codec, reg)) {
if (codec->cache_only)
return -1;
BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
ret = snd_soc_cache_read(codec, reg, &val);
if (ret < 0)
return -1;
return val;
}
#if defined(CONFIG_SPI_MASTER)
static int snd_soc_8_8_spi_write(void *control_data, const char *data,
int len)
{
struct spi_device *spi = control_data;
struct spi_transfer t;
struct spi_message m;
u8 msg[2];
if (len <= 0)
return 0;
msg[0] = data[0];
msg[1] = data[1];
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = len;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
#else
#define snd_soc_8_8_spi_write NULL
#endif
static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 data[3];
int ret;
data[0] = reg;
data[1] = (value >> 8) & 0xff;
data[2] = value & 0xff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
reg < codec->driver->reg_cache_size) {
ret = snd_soc_cache_write(codec, reg, value);
if (ret < 0)
return -1;
}
if (codec->cache_only) {
codec->cache_sync = 1;
return 0;
}
if (codec->hw_write(codec->control_data, data, 3) == 3)
return 0;
else
return -EIO;
}
static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec,
unsigned int reg)
{
int ret;
unsigned int val;
if (reg >= codec->driver->reg_cache_size ||
snd_soc_codec_volatile_register(codec, reg)) {
if (codec->cache_only)
return -1;
BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
ret = snd_soc_cache_read(codec, reg, &val);
if (ret < 0)
return -1;
return val;
}
#if defined(CONFIG_SPI_MASTER)
static int snd_soc_8_16_spi_write(void *control_data, const char *data,
int len)
{
struct spi_device *spi = control_data;
struct spi_transfer t;
struct spi_message m;
u8 msg[3];
if (len <= 0)
return 0;
msg[0] = data[0];
msg[1] = data[1];
msg[2] = data[2];
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = len;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
#else
#define snd_soc_8_16_spi_write NULL
#endif
#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
static unsigned int snd_soc_8_8_read_i2c(struct snd_soc_codec *codec,
unsigned int r)
{
struct i2c_msg xfer[2];
u8 reg = r;
u8 data;
int ret;
struct i2c_client *client = codec->control_data;
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 1;
xfer[0].buf = &reg;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = 1;
xfer[1].buf = &data;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret != 2) {
dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
return 0;
}
return data;
}
#else
#define snd_soc_8_8_read_i2c NULL
#endif
#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
static unsigned int snd_soc_8_16_read_i2c(struct snd_soc_codec *codec,
unsigned int r)
{
struct i2c_msg xfer[2];
u8 reg = r;
u16 data;
int ret;
struct i2c_client *client = codec->control_data;
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 1;
xfer[0].buf = &reg;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = 2;
xfer[1].buf = (u8 *)&data;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret != 2) {
dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
return 0;
}
return (data >> 8) | ((data & 0xff) << 8);
}
#else
#define snd_soc_8_16_read_i2c NULL
#endif
#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
static unsigned int snd_soc_16_8_read_i2c(struct snd_soc_codec *codec,
unsigned int r)
{
struct i2c_msg xfer[2];
u16 reg = r;
u8 data;
int ret;
struct i2c_client *client = codec->control_data;
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 2;
xfer[0].buf = (u8 *)&reg;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = 1;
xfer[1].buf = &data;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret != 2) {
dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
return 0;
}
return data;
}
#else
#define snd_soc_16_8_read_i2c NULL
#endif
static unsigned int snd_soc_16_8_read(struct snd_soc_codec *codec,
unsigned int reg)
{
int ret;
unsigned int val;
reg &= 0xff;
if (reg >= codec->driver->reg_cache_size ||
snd_soc_codec_volatile_register(codec, reg)) {
if (codec->cache_only)
return -1;
BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
ret = snd_soc_cache_read(codec, reg, &val);
if (ret < 0)
return -1;
return val;
}
static int snd_soc_16_8_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 data[3];
int ret;
data[0] = (reg >> 8) & 0xff;
data[1] = reg & 0xff;
data[2] = value;
reg &= 0xff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
reg < codec->driver->reg_cache_size) {
ret = snd_soc_cache_write(codec, reg, value);
if (ret < 0)
return -1;
}
if (codec->cache_only) {
codec->cache_sync = 1;
return 0;
}
ret = codec->hw_write(codec->control_data, data, 3);
if (ret == 3)
return 0;
if (ret < 0)
return ret;
else
return -EIO;
}
#if defined(CONFIG_SPI_MASTER)
static int snd_soc_16_8_spi_write(void *control_data, const char *data,
int len)
{
struct spi_device *spi = control_data;
struct spi_transfer t;
struct spi_message m;
u8 msg[3];
if (len <= 0)
return 0;
msg[0] = data[0];
msg[1] = data[1];
msg[2] = data[2];
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = len;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
#else
#define snd_soc_16_8_spi_write NULL
#endif
#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
static unsigned int snd_soc_16_16_read_i2c(struct snd_soc_codec *codec,
unsigned int r)
{
struct i2c_msg xfer[2];
u16 reg = cpu_to_be16(r);
u16 data;
int ret;
struct i2c_client *client = codec->control_data;
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 2;
xfer[0].buf = (u8 *)&reg;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = 2;
xfer[1].buf = (u8 *)&data;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret != 2) {
dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
return 0;
}
return be16_to_cpu(data);
}
#else
#define snd_soc_16_16_read_i2c NULL
#endif
static unsigned int snd_soc_16_16_read(struct snd_soc_codec *codec,
unsigned int reg)
{
int ret;
unsigned int val;
if (reg >= codec->driver->reg_cache_size ||
snd_soc_codec_volatile_register(codec, reg)) {
if (codec->cache_only)
return -1;
BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
ret = snd_soc_cache_read(codec, reg, &val);
if (ret < 0)
return -1;
return val;
}
static int snd_soc_16_16_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 data[4];
int ret;
data[0] = (reg >> 8) & 0xff;
data[1] = reg & 0xff;
data[2] = (value >> 8) & 0xff;
data[3] = value & 0xff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
reg < codec->driver->reg_cache_size) {
ret = snd_soc_cache_write(codec, reg, value);
if (ret < 0)
return -1;
}
if (codec->cache_only) {
codec->cache_sync = 1;
return 0;
}
ret = codec->hw_write(codec->control_data, data, 4);
if (ret == 4)
return 0;
if (ret < 0)
return ret;
else
return -EIO;
}
#if defined(CONFIG_SPI_MASTER)
static int snd_soc_16_16_spi_write(void *control_data, const char *data,
int len)
{
struct spi_device *spi = control_data;
struct spi_transfer t;
struct spi_message m;
u8 msg[4];
if (len <= 0)
return 0;
msg[0] = data[0];
msg[1] = data[1];
msg[2] = data[2];
msg[3] = data[3];
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = len;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
#else
#define snd_soc_16_16_spi_write NULL
#endif
static struct {
int addr_bits;
int data_bits;
int (*write)(struct snd_soc_codec *codec, unsigned int, unsigned int);
int (*spi_write)(void *, const char *, int);
unsigned int (*read)(struct snd_soc_codec *, unsigned int);
unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int);
} io_types[] = {
{
.addr_bits = 4, .data_bits = 12,
.write = snd_soc_4_12_write, .read = snd_soc_4_12_read,
.spi_write = snd_soc_4_12_spi_write,
},
{
.addr_bits = 7, .data_bits = 9,
.write = snd_soc_7_9_write, .read = snd_soc_7_9_read,
.spi_write = snd_soc_7_9_spi_write,
},
{
.addr_bits = 8, .data_bits = 8,
.write = snd_soc_8_8_write, .read = snd_soc_8_8_read,
.i2c_read = snd_soc_8_8_read_i2c,
.spi_write = snd_soc_8_8_spi_write,
},
{
.addr_bits = 8, .data_bits = 16,
.write = snd_soc_8_16_write, .read = snd_soc_8_16_read,
.i2c_read = snd_soc_8_16_read_i2c,
.spi_write = snd_soc_8_16_spi_write,
},
{
.addr_bits = 16, .data_bits = 8,
.write = snd_soc_16_8_write, .read = snd_soc_16_8_read,
.i2c_read = snd_soc_16_8_read_i2c,
.spi_write = snd_soc_16_8_spi_write,
},
{
.addr_bits = 16, .data_bits = 16,
.write = snd_soc_16_16_write, .read = snd_soc_16_16_read,
.i2c_read = snd_soc_16_16_read_i2c,
.spi_write = snd_soc_16_16_spi_write,
},
};
/**
* snd_soc_codec_set_cache_io: Set up standard I/O functions.
*
* @codec: CODEC to configure.
* @type: Type of cache.
* @addr_bits: Number of bits of register address data.
* @data_bits: Number of bits of data per register.
* @control: Control bus used.
*
* Register formats are frequently shared between many I2C and SPI
* devices. In order to promote code reuse the ASoC core provides
* some standard implementations of CODEC read and write operations
* which can be set up using this function.
*
* The caller is responsible for allocating and initialising the
* actual cache.
*
* Note that at present this code cannot be used by CODECs with
* volatile registers.
*/
int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
int addr_bits, int data_bits,
enum snd_soc_control_type control)
{
int i;
for (i = 0; i < ARRAY_SIZE(io_types); i++)
if (io_types[i].addr_bits == addr_bits &&
io_types[i].data_bits == data_bits)
break;
if (i == ARRAY_SIZE(io_types)) {
printk(KERN_ERR
"No I/O functions for %d bit address %d bit data\n",
addr_bits, data_bits);
return -EINVAL;
}
codec->driver->write = io_types[i].write;
codec->driver->read = io_types[i].read;
switch (control) {
case SND_SOC_CUSTOM:
break;
case SND_SOC_I2C:
#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
codec->hw_write = (hw_write_t)i2c_master_send;
#endif
if (io_types[i].i2c_read)
codec->hw_read = io_types[i].i2c_read;
codec->control_data = container_of(codec->dev,
struct i2c_client,
dev);
break;
case SND_SOC_SPI:
if (io_types[i].spi_write)
codec->hw_write = io_types[i].spi_write;
codec->control_data = container_of(codec->dev,
struct spi_device,
dev);
break;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
struct snd_soc_rbtree_node {
struct rb_node node;
unsigned int reg;
unsigned int value;
unsigned int defval;
} __attribute__ ((packed));
struct snd_soc_rbtree_ctx {
struct rb_root root;
};
static struct snd_soc_rbtree_node *snd_soc_rbtree_lookup(
struct rb_root *root, unsigned int reg)
{
struct rb_node *node;
struct snd_soc_rbtree_node *rbnode;
node = root->rb_node;
while (node) {
rbnode = container_of(node, struct snd_soc_rbtree_node, node);
if (rbnode->reg < reg)
node = node->rb_left;
else if (rbnode->reg > reg)
node = node->rb_right;
else
return rbnode;
}
return NULL;
}
static int snd_soc_rbtree_insert(struct rb_root *root,
struct snd_soc_rbtree_node *rbnode)
{
struct rb_node **new, *parent;
struct snd_soc_rbtree_node *rbnode_tmp;
parent = NULL;
new = &root->rb_node;
while (*new) {
rbnode_tmp = container_of(*new, struct snd_soc_rbtree_node,
node);
parent = *new;
if (rbnode_tmp->reg < rbnode->reg)
new = &((*new)->rb_left);
else if (rbnode_tmp->reg > rbnode->reg)
new = &((*new)->rb_right);
else
return 0;
}
/* insert the node into the rbtree */
rb_link_node(&rbnode->node, parent, new);
rb_insert_color(&rbnode->node, root);
return 1;
}
static int snd_soc_rbtree_cache_sync(struct snd_soc_codec *codec)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct rb_node *node;
struct snd_soc_rbtree_node *rbnode;
unsigned int val;
rbtree_ctx = codec->reg_cache;
for (node = rb_first(&rbtree_ctx->root); node; node = rb_next(node)) {
rbnode = rb_entry(node, struct snd_soc_rbtree_node, node);
if (rbnode->value == rbnode->defval)
continue;
snd_soc_cache_read(codec, rbnode->reg, &val);
snd_soc_write(codec, rbnode->reg, val);
dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
rbnode->reg, val);
}
return 0;
}
static int snd_soc_rbtree_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct snd_soc_rbtree_node *rbnode;
rbtree_ctx = codec->reg_cache;
rbnode = snd_soc_rbtree_lookup(&rbtree_ctx->root, reg);
if (rbnode) {
if (rbnode->value == value)
return 0;
rbnode->value = value;
} else {
/* bail out early, no need to create the rbnode yet */
if (!value)
return 0;
/*
* for uninitialized registers whose value is changed
* from the default zero, create an rbnode and insert
* it into the tree.
*/
rbnode = kzalloc(sizeof *rbnode, GFP_KERNEL);
if (!rbnode)
return -ENOMEM;
rbnode->reg = reg;
rbnode->value = value;
snd_soc_rbtree_insert(&rbtree_ctx->root, rbnode);
}
return 0;
}
static int snd_soc_rbtree_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct snd_soc_rbtree_node *rbnode;
rbtree_ctx = codec->reg_cache;
rbnode = snd_soc_rbtree_lookup(&rbtree_ctx->root, reg);
if (rbnode) {
*value = rbnode->value;
} else {
/* uninitialized registers default to 0 */
*value = 0;
}
return 0;
}
static int snd_soc_rbtree_cache_exit(struct snd_soc_codec *codec)
{
struct rb_node *next;
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct snd_soc_rbtree_node *rbtree_node;
/* if we've already been called then just return */
rbtree_ctx = codec->reg_cache;
if (!rbtree_ctx)
return 0;
/* free up the rbtree */
next = rb_first(&rbtree_ctx->root);
while (next) {
rbtree_node = rb_entry(next, struct snd_soc_rbtree_node, node);
next = rb_next(&rbtree_node->node);
rb_erase(&rbtree_node->node, &rbtree_ctx->root);
kfree(rbtree_node);
}
/* release the resources */
kfree(codec->reg_cache);
codec->reg_cache = NULL;
return 0;
}
static int snd_soc_rbtree_cache_init(struct snd_soc_codec *codec)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
codec->reg_cache = kmalloc(sizeof *rbtree_ctx, GFP_KERNEL);
if (!codec->reg_cache)
return -ENOMEM;
rbtree_ctx = codec->reg_cache;
rbtree_ctx->root = RB_ROOT;
if (!codec->driver->reg_cache_default)
return 0;
/*
* populate the rbtree with the initialized registers. All other
* registers will be inserted into the tree when they are first written.
*
* The reasoning behind this, is that we need to step through and
* dereference the cache in u8/u16 increments without sacrificing
* portability. This could also be done using memcpy() but that would
* be slightly more cryptic.
*/
#define snd_soc_rbtree_populate(cache) \
({ \
int ret, i; \
struct snd_soc_rbtree_node *rbtree_node; \
\
ret = 0; \
cache = codec->driver->reg_cache_default; \
for (i = 0; i < codec->driver->reg_cache_size; ++i) { \
if (!cache[i]) \
continue; \
rbtree_node = kzalloc(sizeof *rbtree_node, GFP_KERNEL); \
if (!rbtree_node) { \
ret = -ENOMEM; \
snd_soc_cache_exit(codec); \
break; \
} \
rbtree_node->reg = i; \
rbtree_node->value = cache[i]; \
rbtree_node->defval = cache[i]; \
snd_soc_rbtree_insert(&rbtree_ctx->root, \
rbtree_node); \
} \
ret; \
})
switch (codec->driver->reg_word_size) {
case 1: {
const u8 *cache;
return snd_soc_rbtree_populate(cache);
}
case 2: {
const u16 *cache;
return snd_soc_rbtree_populate(cache);
}
default:
BUG();
}
return 0;
}
struct snd_soc_lzo_ctx {
void *wmem;
void *dst;
const void *src;
size_t src_len;
size_t dst_len;
size_t decompressed_size;
unsigned long *sync_bmp;
int sync_bmp_nbits;
};
#define LZO_BLOCK_NUM 8
static int snd_soc_lzo_block_count(void)
{
return LZO_BLOCK_NUM;
}
static int snd_soc_lzo_prepare(struct snd_soc_lzo_ctx *lzo_ctx)
{
lzo_ctx->wmem = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
if (!lzo_ctx->wmem)
return -ENOMEM;
return 0;
}
static int snd_soc_lzo_compress(struct snd_soc_lzo_ctx *lzo_ctx)
{
size_t compress_size;
int ret;
ret = lzo1x_1_compress(lzo_ctx->src, lzo_ctx->src_len,
lzo_ctx->dst, &compress_size, lzo_ctx->wmem);
if (ret != LZO_E_OK || compress_size > lzo_ctx->dst_len)
return -EINVAL;
lzo_ctx->dst_len = compress_size;
return 0;
}
static int snd_soc_lzo_decompress(struct snd_soc_lzo_ctx *lzo_ctx)
{
size_t dst_len;
int ret;
dst_len = lzo_ctx->dst_len;
ret = lzo1x_decompress_safe(lzo_ctx->src, lzo_ctx->src_len,
lzo_ctx->dst, &dst_len);
if (ret != LZO_E_OK || dst_len != lzo_ctx->dst_len)
return -EINVAL;
return 0;
}
static int snd_soc_lzo_compress_cache_block(struct snd_soc_codec *codec,
struct snd_soc_lzo_ctx *lzo_ctx)
{
int ret;
lzo_ctx->dst_len = lzo1x_worst_compress(PAGE_SIZE);
lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL);
if (!lzo_ctx->dst) {
lzo_ctx->dst_len = 0;
return -ENOMEM;
}
ret = snd_soc_lzo_compress(lzo_ctx);
if (ret < 0)
return ret;
return 0;
}
static int snd_soc_lzo_decompress_cache_block(struct snd_soc_codec *codec,
struct snd_soc_lzo_ctx *lzo_ctx)
{
int ret;
lzo_ctx->dst_len = lzo_ctx->decompressed_size;
lzo_ctx->dst = kmalloc(lzo_ctx->dst_len, GFP_KERNEL);
if (!lzo_ctx->dst) {
lzo_ctx->dst_len = 0;
return -ENOMEM;
}
ret = snd_soc_lzo_decompress(lzo_ctx);
if (ret < 0)
return ret;
return 0;
}
static inline int snd_soc_lzo_get_blkindex(struct snd_soc_codec *codec,
unsigned int reg)
{
struct snd_soc_codec_driver *codec_drv;
size_t reg_size;
codec_drv = codec->driver;
reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
return (reg * codec_drv->reg_word_size) /
DIV_ROUND_UP(reg_size, snd_soc_lzo_block_count());
}
static inline int snd_soc_lzo_get_blkpos(struct snd_soc_codec *codec,
unsigned int reg)
{
struct snd_soc_codec_driver *codec_drv;
size_t reg_size;
codec_drv = codec->driver;
reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
return reg % (DIV_ROUND_UP(reg_size, snd_soc_lzo_block_count()) /
codec_drv->reg_word_size);
}
static inline int snd_soc_lzo_get_blksize(struct snd_soc_codec *codec)
{
struct snd_soc_codec_driver *codec_drv;
size_t reg_size;
codec_drv = codec->driver;
reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
return DIV_ROUND_UP(reg_size, snd_soc_lzo_block_count());
}
static int snd_soc_lzo_cache_sync(struct snd_soc_codec *codec)
{
struct snd_soc_lzo_ctx **lzo_blocks;
unsigned int val;
int i;
lzo_blocks = codec->reg_cache;
for_each_set_bit(i, lzo_blocks[0]->sync_bmp, lzo_blocks[0]->sync_bmp_nbits) {
snd_soc_cache_read(codec, i, &val);
snd_soc_write(codec, i, val);
dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
i, val);
}
return 0;
}
static int snd_soc_lzo_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value)
{
struct snd_soc_lzo_ctx *lzo_block, **lzo_blocks;
int ret, blkindex, blkpos;
size_t blksize, tmp_dst_len;
void *tmp_dst;
/* index of the compressed lzo block */
blkindex = snd_soc_lzo_get_blkindex(codec, reg);
/* register index within the decompressed block */
blkpos = snd_soc_lzo_get_blkpos(codec, reg);
/* size of the compressed block */
blksize = snd_soc_lzo_get_blksize(codec);
lzo_blocks = codec->reg_cache;
lzo_block = lzo_blocks[blkindex];
/* save the pointer and length of the compressed block */
tmp_dst = lzo_block->dst;
tmp_dst_len = lzo_block->dst_len;
/* prepare the source to be the compressed block */
lzo_block->src = lzo_block->dst;
lzo_block->src_len = lzo_block->dst_len;
/* decompress the block */
ret = snd_soc_lzo_decompress_cache_block(codec, lzo_block);
if (ret < 0) {
kfree(lzo_block->dst);
goto out;
}
/* write the new value to the cache */
switch (codec->driver->reg_word_size) {
case 1: {
u8 *cache;
cache = lzo_block->dst;
if (cache[blkpos] == value) {
kfree(lzo_block->dst);
goto out;
}
cache[blkpos] = value;
}
break;
case 2: {
u16 *cache;
cache = lzo_block->dst;
if (cache[blkpos] == value) {
kfree(lzo_block->dst);
goto out;
}
cache[blkpos] = value;
}
break;
default:
BUG();
}
/* prepare the source to be the decompressed block */
lzo_block->src = lzo_block->dst;
lzo_block->src_len = lzo_block->dst_len;
/* compress the block */
ret = snd_soc_lzo_compress_cache_block(codec, lzo_block);
if (ret < 0) {
kfree(lzo_block->dst);
kfree(lzo_block->src);
goto out;
}
/* set the bit so we know we have to sync this register */
set_bit(reg, lzo_block->sync_bmp);
kfree(tmp_dst);
kfree(lzo_block->src);
return 0;
out:
lzo_block->dst = tmp_dst;
lzo_block->dst_len = tmp_dst_len;
return ret;
}
static int snd_soc_lzo_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value)
{
struct snd_soc_lzo_ctx *lzo_block, **lzo_blocks;
int ret, blkindex, blkpos;
size_t blksize, tmp_dst_len;
void *tmp_dst;
*value = 0;
/* index of the compressed lzo block */
blkindex = snd_soc_lzo_get_blkindex(codec, reg);
/* register index within the decompressed block */
blkpos = snd_soc_lzo_get_blkpos(codec, reg);
/* size of the compressed block */
blksize = snd_soc_lzo_get_blksize(codec);
lzo_blocks = codec->reg_cache;
lzo_block = lzo_blocks[blkindex];
/* save the pointer and length of the compressed block */
tmp_dst = lzo_block->dst;
tmp_dst_len = lzo_block->dst_len;
/* prepare the source to be the compressed block */
lzo_block->src = lzo_block->dst;
lzo_block->src_len = lzo_block->dst_len;
/* decompress the block */
ret = snd_soc_lzo_decompress_cache_block(codec, lzo_block);
if (ret >= 0) {
/* fetch the value from the cache */
switch (codec->driver->reg_word_size) {
case 1: {
u8 *cache;
cache = lzo_block->dst;
*value = cache[blkpos];
}
break;
case 2: {
u16 *cache;
cache = lzo_block->dst;
*value = cache[blkpos];
}
break;
default:
BUG();
}
}
kfree(lzo_block->dst);
/* restore the pointer and length of the compressed block */
lzo_block->dst = tmp_dst;
lzo_block->dst_len = tmp_dst_len;
return 0;
}
static int snd_soc_lzo_cache_exit(struct snd_soc_codec *codec)
{
struct snd_soc_lzo_ctx **lzo_blocks;
int i, blkcount;
lzo_blocks = codec->reg_cache;
if (!lzo_blocks)
return 0;
blkcount = snd_soc_lzo_block_count();
/*
* the pointer to the bitmap used for syncing the cache
* is shared amongst all lzo_blocks. Ensure it is freed
* only once.
*/
if (lzo_blocks[0])
kfree(lzo_blocks[0]->sync_bmp);
for (i = 0; i < blkcount; ++i) {
if (lzo_blocks[i]) {
kfree(lzo_blocks[i]->wmem);
kfree(lzo_blocks[i]->dst);
}
/* each lzo_block is a pointer returned by kmalloc or NULL */
kfree(lzo_blocks[i]);
}
kfree(lzo_blocks);
codec->reg_cache = NULL;
return 0;
}
static int snd_soc_lzo_cache_init(struct snd_soc_codec *codec)
{
struct snd_soc_lzo_ctx **lzo_blocks;
size_t reg_size, bmp_size;
struct snd_soc_codec_driver *codec_drv;
int ret, tofree, i, blksize, blkcount;
const char *p, *end;
unsigned long *sync_bmp;
ret = 0;
codec_drv = codec->driver;
reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
/*
* If we have not been given a default register cache
* then allocate a dummy zero-ed out region, compress it
* and remember to free it afterwards.
*/
tofree = 0;
if (!codec_drv->reg_cache_default)
tofree = 1;
if (!codec_drv->reg_cache_default) {
codec_drv->reg_cache_default = kzalloc(reg_size,
GFP_KERNEL);
if (!codec_drv->reg_cache_default)
return -ENOMEM;
}
blkcount = snd_soc_lzo_block_count();
codec->reg_cache = kzalloc(blkcount * sizeof *lzo_blocks,
GFP_KERNEL);
if (!codec->reg_cache) {
ret = -ENOMEM;
goto err_tofree;
}
lzo_blocks = codec->reg_cache;
/*
* allocate a bitmap to be used when syncing the cache with
* the hardware. Each time a register is modified, the corresponding
* bit is set in the bitmap, so we know that we have to sync
* that register.
*/
bmp_size = codec_drv->reg_cache_size;
sync_bmp = kmalloc(BITS_TO_LONGS(bmp_size) * sizeof (long),
GFP_KERNEL);
if (!sync_bmp) {
ret = -ENOMEM;
goto err;
}
bitmap_zero(sync_bmp, reg_size);
/* allocate the lzo blocks and initialize them */
for (i = 0; i < blkcount; ++i) {
lzo_blocks[i] = kzalloc(sizeof **lzo_blocks,
GFP_KERNEL);
if (!lzo_blocks[i]) {
kfree(sync_bmp);
ret = -ENOMEM;
goto err;
}
lzo_blocks[i]->sync_bmp = sync_bmp;
lzo_blocks[i]->sync_bmp_nbits = reg_size;
/* alloc the working space for the compressed block */
ret = snd_soc_lzo_prepare(lzo_blocks[i]);
if (ret < 0)
goto err;
}
blksize = snd_soc_lzo_get_blksize(codec);
p = codec_drv->reg_cache_default;
end = codec_drv->reg_cache_default + reg_size;
/* compress the register map and fill the lzo blocks */
for (i = 0; i < blkcount; ++i, p += blksize) {
lzo_blocks[i]->src = p;
if (p + blksize > end)
lzo_blocks[i]->src_len = end - p;
else
lzo_blocks[i]->src_len = blksize;
ret = snd_soc_lzo_compress_cache_block(codec,
lzo_blocks[i]);
if (ret < 0)
goto err;
lzo_blocks[i]->decompressed_size =
lzo_blocks[i]->src_len;
}
if (tofree)
kfree(codec_drv->reg_cache_default);
return 0;
err:
snd_soc_cache_exit(codec);
err_tofree:
if (tofree)
kfree(codec_drv->reg_cache_default);
return ret;
}
static int snd_soc_flat_cache_sync(struct snd_soc_codec *codec)
{
int i;
struct snd_soc_codec_driver *codec_drv;
unsigned int val;
codec_drv = codec->driver;
for (i = 0; i < codec_drv->reg_cache_size; ++i) {
snd_soc_cache_read(codec, i, &val);
if (codec_drv->reg_cache_default) {
switch (codec_drv->reg_word_size) {
case 1: {
const u8 *cache;
cache = codec_drv->reg_cache_default;
if (cache[i] == val)
continue;
}
break;
case 2: {
const u16 *cache;
cache = codec_drv->reg_cache_default;
if (cache[i] == val)
continue;
}
break;
default:
BUG();
}
}
snd_soc_write(codec, i, val);
dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
i, val);
}
return 0;
}
static int snd_soc_flat_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value)
{
switch (codec->driver->reg_word_size) {
case 1: {
u8 *cache;
cache = codec->reg_cache;
cache[reg] = value;
}
break;
case 2: {
u16 *cache;
cache = codec->reg_cache;
cache[reg] = value;
}
break;
default:
BUG();
}
return 0;
}
static int snd_soc_flat_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value)
{
switch (codec->driver->reg_word_size) {
case 1: {
u8 *cache;
cache = codec->reg_cache;
*value = cache[reg];
}
break;
case 2: {
u16 *cache;
cache = codec->reg_cache;
*value = cache[reg];
}
break;
default:
BUG();
}
return 0;
}
static int snd_soc_flat_cache_exit(struct snd_soc_codec *codec)
{
if (!codec->reg_cache)
return 0;
kfree(codec->reg_cache);
codec->reg_cache = NULL;
return 0;
}
static int snd_soc_flat_cache_init(struct snd_soc_codec *codec)
{
struct snd_soc_codec_driver *codec_drv;
size_t reg_size;
codec_drv = codec->driver;
reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
if (codec_drv->reg_cache_default)
codec->reg_cache = kmemdup(codec_drv->reg_cache_default,
reg_size, GFP_KERNEL);
else
codec->reg_cache = kzalloc(reg_size, GFP_KERNEL);
if (!codec->reg_cache)
return -ENOMEM;
return 0;
}
/* an array of all supported compression types */
static const struct snd_soc_cache_ops cache_types[] = {
{
.id = SND_SOC_NO_COMPRESSION,
.init = snd_soc_flat_cache_init,
.exit = snd_soc_flat_cache_exit,
.read = snd_soc_flat_cache_read,
.write = snd_soc_flat_cache_write,
.sync = snd_soc_flat_cache_sync
},
{
.id = SND_SOC_LZO_COMPRESSION,
.init = snd_soc_lzo_cache_init,
.exit = snd_soc_lzo_cache_exit,
.read = snd_soc_lzo_cache_read,
.write = snd_soc_lzo_cache_write,
.sync = snd_soc_lzo_cache_sync
},
{
.id = SND_SOC_RBTREE_COMPRESSION,
.init = snd_soc_rbtree_cache_init,
.exit = snd_soc_rbtree_cache_exit,
.read = snd_soc_rbtree_cache_read,
.write = snd_soc_rbtree_cache_write,
.sync = snd_soc_rbtree_cache_sync
}
};
int snd_soc_cache_init(struct snd_soc_codec *codec)
{
int i;
for (i = 0; i < ARRAY_SIZE(cache_types); ++i)
if (cache_types[i].id == codec->driver->compress_type)
break;
if (i == ARRAY_SIZE(cache_types)) {
dev_err(codec->dev, "Could not match compress type: %d\n",
codec->driver->compress_type);
return -EINVAL;
}
mutex_init(&codec->cache_rw_mutex);
codec->cache_ops = &cache_types[i];
if (codec->cache_ops->init)
return codec->cache_ops->init(codec);
return -EINVAL;
}
/*
* NOTE: keep in mind that this function might be called
* multiple times.
*/
int snd_soc_cache_exit(struct snd_soc_codec *codec)
{
if (codec->cache_ops && codec->cache_ops->exit)
return codec->cache_ops->exit(codec);
return -EINVAL;
}
/**
* snd_soc_cache_read: Fetch the value of a given register from the cache.
*
* @codec: CODEC to configure.
* @reg: The register index.
* @value: The value to be returned.
*/
int snd_soc_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value)
{
int ret;
mutex_lock(&codec->cache_rw_mutex);
if (value && codec->cache_ops && codec->cache_ops->read) {
ret = codec->cache_ops->read(codec, reg, value);
mutex_unlock(&codec->cache_rw_mutex);
return ret;
}
mutex_unlock(&codec->cache_rw_mutex);
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_read);
/**
* snd_soc_cache_write: Set the value of a given register in the cache.
*
* @codec: CODEC to configure.
* @reg: The register index.
* @value: The new register value.
*/
int snd_soc_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value)
{
int ret;
mutex_lock(&codec->cache_rw_mutex);
if (codec->cache_ops && codec->cache_ops->write) {
ret = codec->cache_ops->write(codec, reg, value);
mutex_unlock(&codec->cache_rw_mutex);
return ret;
}
mutex_unlock(&codec->cache_rw_mutex);
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_write);
/**
* snd_soc_cache_sync: Sync the register cache with the hardware.
*
* @codec: CODEC to configure.
*
* Any registers that should not be synced should be marked as
* volatile. In general drivers can choose not to use the provided
* syncing functionality if they so require.
*/
int snd_soc_cache_sync(struct snd_soc_codec *codec)
{
int ret;
if (!codec->cache_sync) {
return 0;
}
if (codec->cache_ops && codec->cache_ops->sync) {
ret = codec->cache_ops->sync(codec);
if (!ret)
codec->cache_sync = 0;
return ret;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_sync);
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