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Commit afab2f7b authored by Mark Brown's avatar Mark Brown
Browse files

regmap: debugfs: Factor out initial seek 



In preparation for doing things a bit more quickly than a linear scan
factor out the initial seek from the debugfs register dump.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent db04328c

drivers/base/regmap/regmap-debugfs.c

+36 −3
Original line number Diff line number Diff line
@@ -56,16 +56,46 @@ static const struct file_operations regmap_name_fops = { 
	.llseek = default_llseek,

};



/*

 * 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)

{

	loff_t p = *pos;

	unsigned int i;



	for (i = base; i <= map->max_register; i += map->reg_stride) {

		if (!regmap_readable(map, i))

			continue;



		if (regmap_precious(map, i))

			continue;



		if (i >= from) {

			*pos = p;

			return i;

		}



		p += map->debugfs_tot_len;

	}



	return base;

}



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 = 0;

	loff_t p = *ppos;

	ssize_t ret;

	int i;

	char *buf;

	unsigned int val;

	unsigned int val, start_reg;



	if (*ppos < 0 || !count)

		return -EINVAL;
@@ -83,7 +113,10 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from, 
			map->debugfs_val_len + 3;      /* : \n */

	}



	for (i = from; i <= to; 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;