diff options
author | Mark Brown <broonie@kernel.org> | 2015-10-20 15:40:59 +0100 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2016-01-05 18:32:22 +0000 |
commit | 8da61f24cc4a4a66ecae69aa9b9aa8fd989a8969 (patch) | |
tree | 3dae41e30879cf235f2602647500232fe3ea86ea | |
parent | 8005c49d9aea74d382f474ce11afbbc7d7130bec (diff) |
regmap: debugfs: Use seq_file for the access map
Unlike the registers file we don't have any substantial performance
concerns rendering the entire file (it involves no device accesses) so
just use seq_printf() to simplify the code.
Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r-- | drivers/base/regmap/regmap-debugfs.c | 69 |
1 files changed, 18 insertions, 51 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index 3f0a7e262d69..1ee3d40861c7 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -397,72 +397,39 @@ static const struct file_operations regmap_reg_ranges_fops = { .llseek = default_llseek, }; -static ssize_t regmap_access_read_file(struct file *file, - char __user *user_buf, size_t count, - loff_t *ppos) +static int regmap_access_show(struct seq_file *s, void *ignored) { - 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; + struct regmap *map = s->private; + int i, reg_len; - 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); - tot_len = reg_len + 10; /* ': R W V P\n' */ for (i = 0; i <= map->max_register; i += map->reg_stride) { /* 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 + tot_len + 1 >= count) - 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; + /* Format the register */ + seq_printf(s, "%.*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'); } - *ppos += buf_pos; + return 0; +} -out: - kfree(buf); - return ret; +static int access_open(struct inode *inode, struct file *file) +{ + return single_open(file, regmap_access_show, inode->i_private); } static const struct file_operations regmap_access_fops = { - .open = simple_open, - .read = regmap_access_read_file, - .llseek = default_llseek, + .open = access_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, }; static ssize_t regmap_cache_only_write_file(struct file *file, |