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Commit 7a3ffefd authored by Kyle Yan's avatar Kyle Yan Committed by Gerrit - the friendly Code Review server
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Merge "regmap: improve debugfs interface to dump specific addresses" into msm-4.8

parents c928dce6 3703a275

drivers/base/regmap/internal.h

+3 −0
Original line number Diff line number Diff line
@@ -86,6 +86,9 @@ struct regmap { 


	struct list_head debugfs_off_cache;

	struct mutex cache_lock;



	unsigned int dump_address;

	unsigned int dump_count;

#endif



	unsigned int max_register;

drivers/base/regmap/regmap-debugfs.c

+69 −0
Original line number Diff line number Diff line
@@ -320,6 +320,67 @@ static const struct file_operations regmap_map_fops = { 
	.llseek = default_llseek,

};



static ssize_t regmap_data_read_file(struct file *file, char __user *user_buf,

				    size_t count, loff_t *ppos)

{

	struct regmap *map = file->private_data;

	int new_count;



	regmap_calc_tot_len(map, NULL, 0);

	new_count = map->dump_count * map->debugfs_tot_len;

	if (new_count > count)

		new_count = count;



	if (*ppos == 0)

		*ppos = map->dump_address * map->debugfs_tot_len;

	else if (*ppos >= map->dump_address * map->debugfs_tot_len

			+ map->dump_count * map->debugfs_tot_len)

		return 0;

	return regmap_read_debugfs(map, 0, map->max_register, user_buf,

			new_count, ppos);

}



#ifdef REGMAP_ALLOW_WRITE_DEBUGFS

static ssize_t regmap_data_write_file(struct file *file,

				     const char __user *user_buf,

				     size_t count, loff_t *ppos)

{

	char buf[32];

	size_t buf_size;

	char *start = buf;

	unsigned long value;

	struct regmap *map = file->private_data;

	int ret;



	buf_size = min(count, (sizeof(buf)-1));

	if (copy_from_user(buf, user_buf, buf_size))

		return -EFAULT;

	buf[buf_size] = 0;



	while (*start == ' ')

		start++;

	if (kstrtoul(start, 16, &value))

		return -EINVAL;



	/* Userspace has been fiddling around behind the kernel's back */

	add_taint(TAINT_USER, LOCKDEP_STILL_OK);



	ret = regmap_write(map, map->dump_address, value);

	if (ret < 0)

		return ret;

	return buf_size;

}

#else

#define regmap_data_write_file NULL

#endif



static const struct file_operations regmap_data_fops = {

	.open = simple_open,

	.read = regmap_data_read_file,

	.write = regmap_data_write_file,

	.llseek = default_llseek,

};



static ssize_t regmap_range_read_file(struct file *file, char __user *user_buf,

				      size_t count, loff_t *ppos)

{
@@ -580,6 +641,14 @@ void regmap_debugfs_init(struct regmap *map, const char *name) 


		debugfs_create_file("registers", registers_mode, map->debugfs,

				    map, &regmap_map_fops);



		debugfs_create_x32("address", 0600, map->debugfs,

				    &map->dump_address);

		debugfs_create_u32("count", 0600, map->debugfs,

				    &map->dump_count);

		debugfs_create_file("data", registers_mode, map->debugfs,

				    map, &regmap_data_fops);



		debugfs_create_file("access", 0400, map->debugfs,

				    map, &regmap_access_fops);

	}