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path: root/drivers/base/regmap/regmap-debugfs.c
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Diffstat (limited to 'drivers/base/regmap/regmap-debugfs.c')
-rw-r--r--drivers/base/regmap/regmap-debugfs.c148
1 files changed, 132 insertions, 16 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index bb1ff175b962..07aad786f817 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -56,17 +56,74 @@ static const struct file_operations regmap_name_fops = {
.llseek = default_llseek,
};
-static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
- size_t count, loff_t *ppos)
+/*
+ * Work out where the start offset maps into register numbers, bearing
+ * in mind that we suppress hidden registers.
+ */
+static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
+ unsigned int base,
+ loff_t from,
+ loff_t *pos)
{
- int reg_len, val_len, tot_len;
- size_t buf_pos = 0;
+ struct regmap_debugfs_off_cache *c = NULL;
loff_t p = 0;
+ unsigned int i, ret;
+
+ /*
+ * If we don't have a cache build one so we don't have to do a
+ * linear scan each time.
+ */
+ if (list_empty(&map->debugfs_off_cache)) {
+ for (i = base; i <= map->max_register; i += map->reg_stride) {
+ /* Skip unprinted registers, closing off cache entry */
+ if (!regmap_readable(map, i) ||
+ regmap_precious(map, i)) {
+ if (c) {
+ c->max = p - 1;
+ list_add_tail(&c->list,
+ &map->debugfs_off_cache);
+ c = NULL;
+ }
+
+ continue;
+ }
+
+ /* No cache entry? Start a new one */
+ if (!c) {
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c)
+ break;
+ c->min = p;
+ c->base_reg = i;
+ }
+
+ p += map->debugfs_tot_len;
+ }
+ }
+
+ /* Find the relevant block */
+ list_for_each_entry(c, &map->debugfs_off_cache, list) {
+ if (*pos >= c->min && *pos <= c->max) {
+ *pos = c->min;
+ return c->base_reg;
+ }
+
+ ret = c->max;
+ }
+
+ return ret;
+}
+
+static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
+ unsigned int to, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ size_t buf_pos = 0;
+ loff_t p = *ppos;
ssize_t ret;
int i;
- struct regmap *map = file->private_data;
char *buf;
- unsigned int val;
+ unsigned int val, start_reg;
if (*ppos < 0 || !count)
return -EINVAL;
@@ -76,11 +133,18 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
return -ENOMEM;
/* Calculate the length of a fixed format */
- reg_len = regmap_calc_reg_len(map->max_register, buf, count);
- val_len = 2 * map->format.val_bytes;
- tot_len = reg_len + val_len + 3; /* : \n */
+ if (!map->debugfs_tot_len) {
+ map->debugfs_reg_len = regmap_calc_reg_len(map->max_register,
+ buf, count);
+ map->debugfs_val_len = 2 * map->format.val_bytes;
+ map->debugfs_tot_len = map->debugfs_reg_len +
+ map->debugfs_val_len + 3; /* : \n */
+ }
- for (i = 0; i <= map->max_register; i += map->reg_stride) {
+ /* Work out which register we're starting at */
+ start_reg = regmap_debugfs_get_dump_start(map, from, *ppos, &p);
+
+ for (i = start_reg; i <= to; i += map->reg_stride) {
if (!regmap_readable(map, i))
continue;
@@ -90,26 +154,27 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
/* If we're in the region the user is trying to read */
if (p >= *ppos) {
/* ...but not beyond it */
- if (buf_pos >= count - 1 - tot_len)
+ if (buf_pos + 1 + map->debugfs_tot_len >= count)
break;
/* Format the register */
snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
- reg_len, i);
- buf_pos += reg_len + 2;
+ map->debugfs_reg_len, i - from);
+ buf_pos += map->debugfs_reg_len + 2;
/* Format the value, write all X if we can't read */
ret = regmap_read(map, i, &val);
if (ret == 0)
snprintf(buf + buf_pos, count - buf_pos,
- "%.*x", val_len, val);
+ "%.*x", map->debugfs_val_len, val);
else
- memset(buf + buf_pos, 'X', val_len);
+ memset(buf + buf_pos, 'X',
+ map->debugfs_val_len);
buf_pos += 2 * map->format.val_bytes;
buf[buf_pos++] = '\n';
}
- p += tot_len;
+ p += map->debugfs_tot_len;
}
ret = buf_pos;
@@ -126,6 +191,15 @@ out:
return ret;
}
+static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct regmap *map = file->private_data;
+
+ return regmap_read_debugfs(map, 0, map->max_register, user_buf,
+ count, ppos);
+}
+
#undef REGMAP_ALLOW_WRITE_DEBUGFS
#ifdef REGMAP_ALLOW_WRITE_DEBUGFS
/*
@@ -174,6 +248,22 @@ static const struct file_operations regmap_map_fops = {
.llseek = default_llseek,
};
+static ssize_t regmap_range_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct regmap_range_node *range = file->private_data;
+ struct regmap *map = range->map;
+
+ return regmap_read_debugfs(map, range->range_min, range->range_max,
+ user_buf, count, ppos);
+}
+
+static const struct file_operations regmap_range_fops = {
+ .open = simple_open,
+ .read = regmap_range_read_file,
+ .llseek = default_llseek,
+};
+
static ssize_t regmap_access_read_file(struct file *file,
char __user *user_buf, size_t count,
loff_t *ppos)
@@ -244,6 +334,11 @@ static const struct file_operations regmap_access_fops = {
void regmap_debugfs_init(struct regmap *map, const char *name)
{
+ struct rb_node *next;
+ struct regmap_range_node *range_node;
+
+ INIT_LIST_HEAD(&map->debugfs_off_cache);
+
if (name) {
map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
dev_name(map->dev), name);
@@ -276,11 +371,32 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
debugfs_create_bool("cache_bypass", 0400, map->debugfs,
&map->cache_bypass);
}
+
+ next = rb_first(&map->range_tree);
+ while (next) {
+ range_node = rb_entry(next, struct regmap_range_node, node);
+
+ if (range_node->name)
+ debugfs_create_file(range_node->name, 0400,
+ map->debugfs, range_node,
+ &regmap_range_fops);
+
+ next = rb_next(&range_node->node);
+ }
}
void regmap_debugfs_exit(struct regmap *map)
{
+ struct regmap_debugfs_off_cache *c;
+
debugfs_remove_recursive(map->debugfs);
+ while (!list_empty(&map->debugfs_off_cache)) {
+ c = list_first_entry(&map->debugfs_off_cache,
+ struct regmap_debugfs_off_cache,
+ list);
+ list_del(&c->list);
+ kfree(c);
+ }
kfree(map->debugfs_name);
}