cregit-Linux how code gets into the kernel

Release 4.10 drivers/regulator/dbx500-prcmu.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *          Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
 *
 * UX500 common part of Power domain regulators
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/module.h>

#include "dbx500-prcmu.h"

/*
 * power state reference count
 */

static int power_state_active_cnt; 
/* will initialize to zero */
static DEFINE_SPINLOCK(power_state_active_lock);


void power_state_active_enable(void) { unsigned long flags; spin_lock_irqsave(&power_state_active_lock, flags); power_state_active_cnt++; spin_unlock_irqrestore(&power_state_active_lock, flags); }

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int power_state_active_disable(void) { int ret = 0; unsigned long flags; spin_lock_irqsave(&power_state_active_lock, flags); if (power_state_active_cnt <= 0) { pr_err("power state: unbalanced enable/disable calls\n"); ret = -EINVAL; goto out; } power_state_active_cnt--; out: spin_unlock_irqrestore(&power_state_active_lock, flags); return ret; }

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#ifdef CONFIG_REGULATOR_DEBUG
static int power_state_active_get(void) { unsigned long flags; int cnt; spin_lock_irqsave(&power_state_active_lock, flags); cnt = power_state_active_cnt; spin_unlock_irqrestore(&power_state_active_lock, flags); return cnt; }

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static struct ux500_regulator_debug { struct dentry *dir; struct dentry *status_file; struct dentry *power_state_cnt_file; struct dbx500_regulator_info *regulator_array; int num_regulators; u8 *state_before_suspend; u8 *state_after_suspend; } rdebug;
static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p) { /* print power state count */ seq_printf(s, "ux500-regulator power state count: %i\n", power_state_active_get()); return 0; }

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static int ux500_regulator_power_state_cnt_open(struct inode *inode, struct file *file) { return single_open(file, ux500_regulator_power_state_cnt_print, inode->i_private); }

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static const struct file_operations ux500_regulator_power_state_cnt_fops = { .open = ux500_regulator_power_state_cnt_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, };
static int ux500_regulator_status_print(struct seq_file *s, void *p) { int i; /* print dump header */ seq_puts(s, "ux500-regulator status:\n"); seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after"); for (i = 0; i < rdebug.num_regulators; i++) { struct dbx500_regulator_info *info; /* Access per-regulator data */ info = &rdebug.regulator_array[i]; /* print status */ seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name, info->is_enabled ? "enabled" : "disabled", rdebug.state_before_suspend[i] ? "enabled" : "disabled", rdebug.state_after_suspend[i] ? "enabled" : "disabled"); } return 0; }

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static int ux500_regulator_status_open(struct inode *inode, struct file *file) { return single_open(file, ux500_regulator_status_print, inode->i_private); }

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static const struct file_operations ux500_regulator_status_fops = { .open = ux500_regulator_status_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; int __attribute__((weak)) dbx500_regulator_testcase( struct dbx500_regulator_info *regulator_info, int num_regulators) { return 0; }
int ux500_regulator_debug_init(struct platform_device *pdev, struct dbx500_regulator_info *regulator_info, int num_regulators) { /* create directory */ rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); if (!rdebug.dir) goto exit_no_debugfs; /* create "status" file */ rdebug.status_file = debugfs_create_file("status", S_IRUGO, rdebug.dir, &pdev->dev, &ux500_regulator_status_fops); if (!rdebug.status_file) goto exit_destroy_dir; /* create "power-state-count" file */ rdebug.power_state_cnt_file = debugfs_create_file("power-state-count", S_IRUGO, rdebug.dir, &pdev->dev, &ux500_regulator_power_state_cnt_fops); if (!rdebug.power_state_cnt_file) goto exit_destroy_status; rdebug.regulator_array = regulator_info; rdebug.num_regulators = num_regulators; rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); if (!rdebug.state_before_suspend) goto exit_destroy_power_state; rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); if (!rdebug.state_after_suspend) goto exit_free; dbx500_regulator_testcase(regulator_info, num_regulators); return 0; exit_free: kfree(rdebug.state_before_suspend); exit_destroy_power_state: debugfs_remove(rdebug.power_state_cnt_file); exit_destroy_status: debugfs_remove(rdebug.status_file); exit_destroy_dir: debugfs_remove(rdebug.dir); exit_no_debugfs: dev_err(&pdev->dev, "failed to create debugfs entries.\n"); return -ENOMEM; }

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int ux500_regulator_debug_exit(void) { debugfs_remove_recursive(rdebug.dir); kfree(rdebug.state_after_suspend); kfree(rdebug.state_before_suspend); return 0; }

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#endif

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jingoo hanjingoo han10.13%125.00%
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