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155 lines
3.7 KiB
155 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson SA 2010 |
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* |
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* Authors: Sundar Iyer <[email protected]> for ST-Ericsson |
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* Bengt Jonsson <[email protected]> for ST-Ericsson |
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* |
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* UX500 common part of Power domain regulators |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/err.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include "dbx500-prcmu.h" |
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/* |
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* power state reference count |
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*/ |
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static int power_state_active_cnt; /* will initialize to zero */ |
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static DEFINE_SPINLOCK(power_state_active_lock); |
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void power_state_active_enable(void) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&power_state_active_lock, flags); |
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power_state_active_cnt++; |
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spin_unlock_irqrestore(&power_state_active_lock, flags); |
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} |
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int power_state_active_disable(void) |
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{ |
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int ret = 0; |
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unsigned long flags; |
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spin_lock_irqsave(&power_state_active_lock, flags); |
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if (power_state_active_cnt <= 0) { |
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pr_err("power state: unbalanced enable/disable calls\n"); |
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ret = -EINVAL; |
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goto out; |
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} |
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power_state_active_cnt--; |
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out: |
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spin_unlock_irqrestore(&power_state_active_lock, flags); |
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return ret; |
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} |
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#ifdef CONFIG_REGULATOR_DEBUG |
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static int power_state_active_get(void) |
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{ |
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unsigned long flags; |
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int cnt; |
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spin_lock_irqsave(&power_state_active_lock, flags); |
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cnt = power_state_active_cnt; |
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spin_unlock_irqrestore(&power_state_active_lock, flags); |
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return cnt; |
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} |
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static struct ux500_regulator_debug { |
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struct dentry *dir; |
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struct dbx500_regulator_info *regulator_array; |
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int num_regulators; |
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u8 *state_before_suspend; |
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u8 *state_after_suspend; |
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} rdebug; |
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static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p) |
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{ |
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/* print power state count */ |
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seq_printf(s, "ux500-regulator power state count: %i\n", |
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power_state_active_get()); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt); |
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static int ux500_regulator_status_show(struct seq_file *s, void *p) |
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{ |
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int i; |
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/* print dump header */ |
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seq_puts(s, "ux500-regulator status:\n"); |
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seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after"); |
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for (i = 0; i < rdebug.num_regulators; i++) { |
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struct dbx500_regulator_info *info; |
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/* Access per-regulator data */ |
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info = &rdebug.regulator_array[i]; |
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/* print status */ |
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seq_printf(s, "%20s : %8s : %8s : %8s\n", |
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info->desc.name, |
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info->is_enabled ? "enabled" : "disabled", |
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rdebug.state_before_suspend[i] ? "enabled" : "disabled", |
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rdebug.state_after_suspend[i] ? "enabled" : "disabled"); |
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} |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status); |
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int |
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ux500_regulator_debug_init(struct platform_device *pdev, |
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struct dbx500_regulator_info *regulator_info, |
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int num_regulators) |
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{ |
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/* create directory */ |
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rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); |
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/* create "status" file */ |
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debugfs_create_file("status", 0444, rdebug.dir, &pdev->dev, |
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&ux500_regulator_status_fops); |
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/* create "power-state-count" file */ |
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debugfs_create_file("power-state-count", 0444, rdebug.dir, |
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&pdev->dev, &ux500_regulator_power_state_cnt_fops); |
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rdebug.regulator_array = regulator_info; |
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rdebug.num_regulators = num_regulators; |
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rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); |
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if (!rdebug.state_before_suspend) |
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goto exit_destroy_power_state; |
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rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); |
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if (!rdebug.state_after_suspend) |
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goto exit_free; |
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return 0; |
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exit_free: |
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kfree(rdebug.state_before_suspend); |
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exit_destroy_power_state: |
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debugfs_remove_recursive(rdebug.dir); |
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return -ENOMEM; |
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} |
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int ux500_regulator_debug_exit(void) |
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{ |
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debugfs_remove_recursive(rdebug.dir); |
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kfree(rdebug.state_after_suspend); |
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kfree(rdebug.state_before_suspend); |
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return 0; |
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} |
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#endif
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