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Commit 634be2a7 authored by Tirupathi Reddy's avatar Tirupathi Reddy
Browse files

regulator: fan53555: Add debugfs node to read/write registers 



The debugfs node allows read/write access to all the FAN buck
registers. Useful in validating the regulator.

Change-Id: Ie7203d6c1e31a58619d7ff5313f682c961258c37
Signed-off-by: default avatarTirupathi Reddy <tirupath@codeaurora.org>
parent 763e35c9

drivers/regulator/fan53555.c

+61 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/i2c.h>

#include <linux/slab.h>

#include <linux/regmap.h>

#include <linux/debugfs.h>

#include <linux/regulator/fan53555.h>



/* Voltage setting */
@@ -98,6 +99,9 @@ struct fan53555_device_info { 
	unsigned int slew_rate;

	/* Sleep voltage cache */

	unsigned int sleep_vol_cache;

	unsigned int peek_poke_address;



	struct dentry *debug_root;



	bool disable_suspend;

};
@@ -446,6 +450,38 @@ static int fan53555_of_init(struct device_node *node, 
	return 0;

}



static int get_reg(void *data, u64 *val)

{

	struct fan53555_device_info *di = data;

	int rc;

	unsigned int temp = 0;



	rc = regmap_read(di->regmap, di->peek_poke_address, &temp);

	if (rc < 0)

		dev_err(di->dev, "Couldn't read reg %x rc = %d\n",

				di->peek_poke_address, rc);

	else

		*val = temp;



	return rc;

}



static int set_reg(void *data, u64 val)

{

	struct fan53555_device_info *di = data;

	int rc;

	unsigned int temp = 0;



	temp = (unsigned int) val;

	rc = regmap_write(di->regmap, di->peek_poke_address, temp);

	if (rc < 0)

		dev_err(di->dev, "Couldn't write 0x%02x to 0x%02x rc= %d\n",

			di->peek_poke_address, temp, rc);



	return rc;

}

DEFINE_SIMPLE_ATTRIBUTE(poke_poke_debug_ops, get_reg, set_reg, "0x%02llx\n");



static int fan53555_regulator_probe(struct i2c_client *client,

				const struct i2c_device_id *id)

{
@@ -519,6 +555,28 @@ static int fan53555_regulator_probe(struct i2c_client *client, 
	if (ret < 0)

		dev_err(&client->dev, "Failed to register regulator!\n");



	di->debug_root = debugfs_create_dir("fan53555", NULL);

	if (!di->debug_root)

		dev_err(&client->dev, "Couldn't create debug dir\n");



	if (di->debug_root) {

		struct dentry *ent;



		ent = debugfs_create_x32("address", S_IFREG | S_IWUSR | S_IRUGO,

					  di->debug_root,

					  &(di->peek_poke_address));

		if (!ent)

			dev_err(&client->dev, "Couldn't create address debug file rc = %d\n",

									ret);



		ent = debugfs_create_file("data", S_IFREG | S_IWUSR | S_IRUGO,

					  di->debug_root, di,

					  &poke_poke_debug_ops);

		if (!ent)

			dev_err(&client->dev, "Couldn't create data debug file rc = %d\n",

									ret);

	}



	return ret;



}
@@ -528,6 +586,9 @@ static int fan53555_regulator_remove(struct i2c_client *client) 
	struct fan53555_device_info *di = i2c_get_clientdata(client);



	regulator_unregister(di->rdev);



	debugfs_remove_recursive(di->debug_root);



	return 0;

}