// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 frank@allwinnertech.com
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*/
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#include <linux/device.h>
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/pm_opp.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#define DEFINE_SHOW_ATTRIBUTE(__name) \
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static int __name ## _open(struct inode *inode, struct file *file) \
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{ \
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return single_open(file, __name ## _show, inode->i_private); \
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} \
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\
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static const struct file_operations __name ## _fops = { \
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.owner = THIS_MODULE, \
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.open = __name ## _open, \
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.read = seq_read, \
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.llseek = seq_lseek, \
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.release = single_release, \
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}
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static int cpufreq_table_show(struct seq_file *s, void *unused)
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{
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struct dev_pm_opp *opp;
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int i, max_opps;
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unsigned long rate, vol;
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struct device *dev;
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dev = get_cpu_device(0);
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if (!dev)
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return 0;
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seq_printf(s, "freq(kHz)\tvol(mv)\n");
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seq_printf(s, "-----------------------\n");
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rcu_read_lock();
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max_opps = dev_pm_opp_get_opp_count(dev);
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if (max_opps < 0)
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goto out;
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for (i = 0, rate = 0; i < max_opps; i++, rate++) {
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/* find next rate */
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opp = dev_pm_opp_find_freq_ceil(dev, &rate);
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vol = dev_pm_opp_get_voltage(opp);
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seq_printf(s, "%ld\t\t", rate / 1000);
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seq_printf(s, "%ld\n", vol / 1000);
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}
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out:
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rcu_read_unlock();
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(cpufreq_table);
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static int __init vf_init(void)
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{
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debugfs_create_file("cpufreq_table", 0444, NULL, NULL,
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&cpufreq_table_fops);
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return 0;
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}
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module_init(vf_init);
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MODULE_LICENSE("GPL");
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