#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)
{
- u16 *cache = codec->reg_cache;
+ 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);
}
- return cache[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)
{
- u16 *cache = codec->reg_cache;
u8 data[2];
int ret;
data[1] = value & 0x00ff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
- reg < codec->driver->reg_cache_size)
- cache[reg] = value;
+ 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;
}
- dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
-
ret = codec->hw_write(codec->control_data, data, 2);
if (ret == 2)
return 0;
msg[1] = data[0];
spi_message_init(&m);
- memset(&t, 0, (sizeof t));
+ memset(&t, 0, sizeof t);
t.tx_buf = &msg[0];
t.len = len;
static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec,
unsigned int reg)
{
- u16 *cache = codec->reg_cache;
+ 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);
}
- return cache[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)
{
- u16 *cache = codec->reg_cache;
u8 data[2];
int ret;
data[1] = value & 0x00ff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
- reg < codec->driver->reg_cache_size)
- cache[reg] = value;
+ 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;
}
- dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
-
ret = codec->hw_write(codec->control_data, data, 2);
if (ret == 2)
return 0;
msg[1] = data[1];
spi_message_init(&m);
- memset(&t, 0, (sizeof t));
+ memset(&t, 0, sizeof t);
t.tx_buf = &msg[0];
t.len = len;
static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
- u8 *cache = codec->reg_cache;
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)
- cache[reg] = value;
+ 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;
}
- dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
-
if (codec->hw_write(codec->control_data, data, 2) == 2)
return 0;
else
static unsigned int snd_soc_8_8_read(struct snd_soc_codec *codec,
unsigned int reg)
{
- u8 *cache = codec->reg_cache;
+ int ret;
+ unsigned int val;
reg &= 0xff;
if (reg >= codec->driver->reg_cache_size ||
if (codec->cache_only)
return -1;
+ BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
- return cache[reg];
+ ret = snd_soc_cache_read(codec, reg, &val);
+ if (ret < 0)
+ return -1;
+ return val;
}
#if defined(CONFIG_SPI_MASTER)
msg[1] = data[1];
spi_message_init(&m);
- memset(&t, 0, (sizeof t));
+ memset(&t, 0, sizeof t);
t.tx_buf = &msg[0];
t.len = len;
static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
- u16 *reg_cache = codec->reg_cache;
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)
- reg_cache[reg] = value;
+ 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;
}
- dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
-
if (codec->hw_write(codec->control_data, data, 3) == 3)
return 0;
else
static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec,
unsigned int reg)
{
- u16 *cache = codec->reg_cache;
+ 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);
- } else {
- return cache[reg];
}
+
+ ret = snd_soc_cache_read(codec, reg, &val);
+ if (ret < 0)
+ return -1;
+ return val;
}
#if defined(CONFIG_SPI_MASTER)
msg[2] = data[2];
spi_message_init(&m);
- memset(&t, 0, (sizeof t));
+ memset(&t, 0, sizeof t);
t.tx_buf = &msg[0];
t.len = len;
static unsigned int snd_soc_16_8_read(struct snd_soc_codec *codec,
unsigned int reg)
{
- u8 *cache = codec->reg_cache;
+ int ret;
+ unsigned int val;
reg &= 0xff;
if (reg >= codec->driver->reg_cache_size ||
if (codec->cache_only)
return -1;
+ BUG_ON(!codec->hw_read);
return codec->hw_read(codec, reg);
}
- return cache[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 *cache = codec->reg_cache;
u8 data[3];
int ret;
reg &= 0xff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
- reg < codec->driver->reg_cache_size)
- cache[reg] = value;
+ 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;
}
- dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
-
ret = codec->hw_write(codec->control_data, data, 3);
if (ret == 3)
return 0;
msg[2] = data[2];
spi_message_init(&m);
- memset(&t, 0, (sizeof t));
+ memset(&t, 0, sizeof t);
t.tx_buf = &msg[0];
t.len = len;
static unsigned int snd_soc_16_16_read(struct snd_soc_codec *codec,
unsigned int reg)
{
- u16 *cache = codec->reg_cache;
+ 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);
}
- return cache[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)
{
- u16 *cache = codec->reg_cache;
u8 data[4];
int ret;
data[3] = value & 0xff;
if (!snd_soc_codec_volatile_register(codec, reg) &&
- reg < codec->driver->reg_cache_size)
- cache[reg] = value;
+ 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;
}
- dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
-
ret = codec->hw_write(codec->control_data, data, 4);
if (ret == 4)
return 0;
msg[3] = data[3];
spi_message_init(&m);
- memset(&t, 0, (sizeof t));
+ memset(&t, 0, sizeof t);
t.tx_buf = &msg[0];
t.len = len;
return -EINVAL;
}
- codec->driver->write = io_types[i].write;
- codec->driver->read = io_types[i].read;
+ codec->write = io_types[i].write;
+ codec->read = io_types[i].read;
switch (control) {
case SND_SOC_CUSTOM:
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;
+ int ret;
+
+ 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;
+ ret = snd_soc_cache_read(codec, rbnode->reg, &val);
+ if (ret)
+ return ret;
+ ret = snd_soc_write(codec, rbnode->reg, val);
+ if (ret)
+ return ret;
+ 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->reg_def_copy)
+ 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->reg_def_copy; \
+ 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;
+}
+
+#ifdef CONFIG_SND_SOC_CACHE_LZO
+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)
+{
+ const 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)
+{
+ const 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)
+{
+ const 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;
+ int ret;
+
+ lzo_blocks = codec->reg_cache;
+ for_each_set_bit(i, lzo_blocks[0]->sync_bmp, lzo_blocks[0]->sync_bmp_nbits) {
+ ret = snd_soc_cache_read(codec, i, &val);
+ if (ret)
+ return ret;
+ ret = snd_soc_write(codec, i, val);
+ if (ret)
+ return ret;
+ 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;
+ const 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->reg_def_copy)
+ tofree = 1;
+
+ if (!codec->reg_def_copy) {
+ codec->reg_def_copy = kzalloc(reg_size,
+ GFP_KERNEL);
+ if (!codec->reg_def_copy)
+ 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, bmp_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 = bmp_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->reg_def_copy;
+ end = codec->reg_def_copy + 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->reg_def_copy);
+ codec->reg_def_copy = NULL;
+ }
+ return 0;
+err:
+ snd_soc_cache_exit(codec);
+err_tofree:
+ if (tofree) {
+ kfree(codec->reg_def_copy);
+ codec->reg_def_copy = NULL;
+ }
+ return ret;
+}
+#endif
+
+static int snd_soc_flat_cache_sync(struct snd_soc_codec *codec)
+{
+ int i;
+ int ret;
+ const struct snd_soc_codec_driver *codec_drv;
+ unsigned int val;
+
+ codec_drv = codec->driver;
+ for (i = 0; i < codec_drv->reg_cache_size; ++i) {
+ ret = snd_soc_cache_read(codec, i, &val);
+ if (ret)
+ return ret;
+ 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();
+ }
+ }
+ ret = snd_soc_write(codec, i, val);
+ if (ret)
+ return ret;
+ 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)
+{
+ const 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;
+
+ /*
+ * for flat compression, we don't need to keep a copy of the
+ * original defaults register cache as it will definitely not
+ * be marked as __devinitconst
+ */
+ kfree(codec->reg_def_copy);
+ codec->reg_def_copy = NULL;
+
+ 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[] = {
+ /* Flat *must* be the first entry for fallback */
+ {
+ .id = SND_SOC_FLAT_COMPRESSION,
+ .name = "flat",
+ .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
+ },
+#ifdef CONFIG_SND_SOC_CACHE_LZO
+ {
+ .id = SND_SOC_LZO_COMPRESSION,
+ .name = "LZO",
+ .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
+ },
+#endif
+ {
+ .id = SND_SOC_RBTREE_COMPRESSION,
+ .name = "rbtree",
+ .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->compress_type)
+ break;
+
+ /* Fall back to flat compression */
+ if (i == ARRAY_SIZE(cache_types)) {
+ dev_warn(codec->dev, "Could not match compress type: %d\n",
+ codec->compress_type);
+ i = 0;
+ }
+
+ mutex_init(&codec->cache_rw_mutex);
+ codec->cache_ops = &cache_types[i];
+
+ if (codec->cache_ops->init) {
+ if (codec->cache_ops->name)
+ dev_dbg(codec->dev, "Initializing %s cache for %s codec\n",
+ codec->cache_ops->name, codec->name);
+ 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) {
+ if (codec->cache_ops->name)
+ dev_dbg(codec->dev, "Destroying %s cache for %s codec\n",
+ codec->cache_ops->name, codec->name);
+ 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) {
+ if (codec->cache_ops->name)
+ dev_dbg(codec->dev, "Syncing %s cache for %s codec\n",
+ codec->cache_ops->name, codec->name);
+ ret = codec->cache_ops->sync(codec);
+ if (!ret)
+ codec->cache_sync = 0;
+ return ret;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_cache_sync);
projects / mv-sheeva.git / blobdiff