diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap-debugfs.c | 72 |
1 files changed, 71 insertions, 1 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index e541d7f4b4e0..7a8d67537d3f 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -109,6 +109,73 @@ static const struct file_operations regmap_map_fops = { .llseek = default_llseek, }; +static ssize_t regmap_access_read_file(struct file *file, + char __user *user_buf, size_t count, + loff_t *ppos) +{ + int reg_len, tot_len; + size_t buf_pos = 0; + loff_t p = 0; + ssize_t ret; + int i; + struct regmap *map = file->private_data; + char *buf; + + if (*ppos < 0 || !count) + return -EINVAL; + + buf = kmalloc(count, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + /* Calculate the length of a fixed format */ + reg_len = regmap_calc_reg_len(map->max_register, buf, count); + tot_len = reg_len + 10; /* ': R W V P\n' */ + + for (i = 0; i < map->max_register; i++) { + /* Ignore registers which are neither readable nor writable */ + if (!regmap_readable(map, i) && !regmap_writeable(map, i)) + continue; + + /* 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) + break; + + /* Format the register */ + snprintf(buf + buf_pos, count - buf_pos, + "%.*x: %c %c %c %c\n", + reg_len, i, + regmap_readable(map, i) ? 'y' : 'n', + regmap_writeable(map, i) ? 'y' : 'n', + regmap_volatile(map, i) ? 'y' : 'n', + regmap_precious(map, i) ? 'y' : 'n'); + + buf_pos += tot_len; + } + p += tot_len; + } + + ret = buf_pos; + + if (copy_to_user(user_buf, buf, buf_pos)) { + ret = -EFAULT; + goto out; + } + + *ppos += buf_pos; + +out: + kfree(buf); + return ret; +} + +static const struct file_operations regmap_access_fops = { + .open = regmap_open_file, + .read = regmap_access_read_file, + .llseek = default_llseek, +}; void regmap_debugfs_init(struct regmap *map) { @@ -119,9 +186,12 @@ void regmap_debugfs_init(struct regmap *map) return; } - if (map->max_register) + if (map->max_register) { debugfs_create_file("registers", 0400, map->debugfs, map, ®map_map_fops); + debugfs_create_file("access", 0400, map->debugfs, + map, ®map_access_fops); + } } void regmap_debugfs_exit(struct regmap *map) |