clock-debug.c

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/*
 * Copyright (C) 2007 Google, Inc.
 * Copyright (c) 2007-2010, Code Aurora Forum. All rights reserved.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/clk.h>
#include "clock.h"

static int clock_debug_rate_set(void *data, u64 val)
{
    struct clk *clock = data;
    int ret;

    /* Only increases to max rate will succeed, but that's actually good
     * for debugging purposes so we don't check for error. */
    if (clock->flags & CLK_MAX)
        clk_set_max_rate(clock, val);
    if (clock->flags & CLK_MIN)
        ret = clk_set_min_rate(clock, val);
    else
        ret = clk_set_rate(clock, val);
    if (ret != 0)
        printk(KERN_ERR "clk_set%s_rate failed (%d)\n",
            (clock->flags & CLK_MIN) ? "_min" : "", ret);
    return ret;
}

static int clock_debug_rate_get(void *data, u64 *val)
{
    struct clk *clock = data;
    *val = clk_get_rate(clock);
    return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
            clock_debug_rate_set, "%llu\n");

static int clock_debug_enable_set(void *data, u64 val)
{
    struct clk *clock = data;
    int rc = 0;

    if (val)
        rc = clock->ops->enable(clock->id);
    else
        clock->ops->disable(clock->id);

    return rc;
}

static int clock_debug_enable_get(void *data, u64 *val)
{
    struct clk *clock = data;

    *val = clock->ops->is_enabled(clock->id);

    return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
            clock_debug_enable_set, "%llu\n");

static int clock_debug_local_get(void *data, u64 *val)
{
    struct clk *clock = data;

    *val = clock->ops->is_local(clock->id);

    return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
            NULL, "%llu\n");

static struct dentry *debugfs_base;

int __init clock_debug_init(void)
{
    debugfs_base = debugfs_create_dir("clk", NULL);
    if (!debugfs_base)
        return -ENOMEM;
    return 0;
}

int __init clock_debug_add(struct clk *clock)
{
    char temp[50], *ptr;
    struct dentry *clk_dir;

    if (!debugfs_base)
        return -ENOMEM;

    strncpy(temp, clock->dbg_name, ARRAY_SIZE(temp)-1);
    for (ptr = temp; *ptr; ptr++)
        *ptr = tolower(*ptr);

    clk_dir = debugfs_create_dir(temp, debugfs_base);
    if (!clk_dir)
        return -ENOMEM;

    if (!debugfs_create_file("rate", S_IRUGO | S_IWUSR, clk_dir,
                clock, &clock_rate_fops))
        goto error;

    if (!debugfs_create_file("enable", S_IRUGO | S_IWUSR, clk_dir,
                clock, &clock_enable_fops))
        goto error;

    if (!debugfs_create_file("is_local", S_IRUGO, clk_dir, clock,
                &clock_local_fops))
        goto error;
    return 0;
error:
    debugfs_remove_recursive(clk_dir);
    return -ENOMEM;
}