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/*
* Copyright (c) 2011, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/mfd/pm8xxx/core.h>
#include <linux/debugfs.h>
#define PM8XXX_DEBUG_DEV_NAME "pm8xxx-debug"
struct pm8xxx_debug_device {
struct mutex debug_mutex;
struct device *parent;
struct dentry *dir;
int addr;
};
static bool pm8xxx_debug_addr_is_valid(int addr)
{
if (addr < 0 || addr > 0x3FF) {
pr_err("PMIC register address is invalid: %d\n", addr);
return false;
}
return true;
}
static int pm8xxx_debug_data_set(void *data, u64 val)
{
struct pm8xxx_debug_device *debugdev = data;
u8 reg = val;
int rc;
mutex_lock(&debugdev->debug_mutex);
if (pm8xxx_debug_addr_is_valid(debugdev->addr)) {
rc = pm8xxx_writeb(debugdev->parent, debugdev->addr, reg);
if (rc)
pr_err("pm8xxx_writeb(0x%03X)=0x%02X failed: rc=%d\n",
debugdev->addr, reg, rc);
}
mutex_unlock(&debugdev->debug_mutex);
return 0;
}
static int pm8xxx_debug_data_get(void *data, u64 *val)
{
struct pm8xxx_debug_device *debugdev = data;
int rc;
u8 reg;
mutex_lock(&debugdev->debug_mutex);
if (pm8xxx_debug_addr_is_valid(debugdev->addr)) {
rc = pm8xxx_readb(debugdev->parent, debugdev->addr, ®);
if (rc)
pr_err("pm8xxx_readb(0x%03X) failed: rc=%d\n",
debugdev->addr, rc);
else
*val = reg;
}
mutex_unlock(&debugdev->debug_mutex);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(debug_data_fops, pm8xxx_debug_data_get,
pm8xxx_debug_data_set, "0x%02llX\n");
static int pm8xxx_debug_addr_set(void *data, u64 val)
{
struct pm8xxx_debug_device *debugdev = data;
if (pm8xxx_debug_addr_is_valid(val)) {
mutex_lock(&debugdev->debug_mutex);
debugdev->addr = val;
mutex_unlock(&debugdev->debug_mutex);
}
return 0;
}
static int pm8xxx_debug_addr_get(void *data, u64 *val)
{
struct pm8xxx_debug_device *debugdev = data;
mutex_lock(&debugdev->debug_mutex);
if (pm8xxx_debug_addr_is_valid(debugdev->addr))
*val = debugdev->addr;
mutex_unlock(&debugdev->debug_mutex);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(debug_addr_fops, pm8xxx_debug_addr_get,
pm8xxx_debug_addr_set, "0x%03llX\n");
static int __devinit pm8xxx_debug_probe(struct platform_device *pdev)
{
char *name = pdev->dev.platform_data;
struct pm8xxx_debug_device *debugdev;
struct dentry *dir;
struct dentry *temp;
int rc;
if (name == NULL) {
pr_err("debugfs directory name must be specified in "
"platform_data pointer\n");
return -EINVAL;
}
debugdev = kzalloc(sizeof(struct pm8xxx_debug_device), GFP_KERNEL);
if (debugdev == NULL) {
pr_err("kzalloc failed\n");
return -ENOMEM;
}
debugdev->parent = pdev->dev.parent;
debugdev->addr = -1;
dir = debugfs_create_dir(name, NULL);
if (dir == NULL || IS_ERR(dir)) {
pr_err("debugfs_create_dir failed: rc=%ld\n", PTR_ERR(dir));
rc = PTR_ERR(dir);
goto dir_error;
}
temp = debugfs_create_file("addr", S_IRUSR | S_IWUSR, dir, debugdev,
&debug_addr_fops);
if (temp == NULL || IS_ERR(temp)) {
pr_err("debugfs_create_file failed: rc=%ld\n", PTR_ERR(temp));
rc = PTR_ERR(temp);
goto file_error;
}
temp = debugfs_create_file("data", S_IRUSR | S_IWUSR, dir, debugdev,
&debug_data_fops);
if (temp == NULL || IS_ERR(temp)) {
pr_err("debugfs_create_file failed: rc=%ld\n", PTR_ERR(temp));
rc = PTR_ERR(temp);
goto file_error;
}
mutex_init(&debugdev->debug_mutex);
debugdev->dir = dir;
platform_set_drvdata(pdev, debugdev);
return 0;
file_error:
debugfs_remove_recursive(dir);
dir_error:
kfree(debugdev);
return rc;
}
static int __devexit pm8xxx_debug_remove(struct platform_device *pdev)
{
struct pm8xxx_debug_device *debugdev = platform_get_drvdata(pdev);
if (debugdev) {
debugfs_remove_recursive(debugdev->dir);
mutex_destroy(&debugdev->debug_mutex);
kfree(debugdev);
}
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver pm8xxx_debug_driver = {
.probe = pm8xxx_debug_probe,
.remove = __devexit_p(pm8xxx_debug_remove),
.driver = {
.name = PM8XXX_DEBUG_DEV_NAME,
.owner = THIS_MODULE,
},
};
static int __init pm8xxx_debug_init(void)
{
return platform_driver_register(&pm8xxx_debug_driver);
}
subsys_initcall(pm8xxx_debug_init);
static void __exit pm8xxx_debug_exit(void)
{
platform_driver_unregister(&pm8xxx_debug_driver);
}
module_exit(pm8xxx_debug_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PM8XXX Debug driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:" PM8XXX_DEBUG_DEV_NAME);
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