--- /dev/null
+/*
+ * 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);
+}
+
+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;
+}
+
+#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;
+}
+
+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;
+
+void ux500_regulator_suspend_debug(void)
+{
+ int i;
+
+ for (i = 0; i < rdebug.num_regulators; i++)
+ rdebug.state_before_suspend[i] =
+ rdebug.regulator_array[i].is_enabled;
+}
+
+void ux500_regulator_resume_debug(void)
+{
+ int i;
+
+ for (i = 0; i < rdebug.num_regulators; i++)
+ rdebug.state_after_suspend[i] =
+ rdebug.regulator_array[i].is_enabled;
+}
+
+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;
+}
+
+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);
+}
+
+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;
+}
+
+static int ux500_regulator_status_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ux500_regulator_status_print,
+ inode->i_private);
+}
+
+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;
+}
+
+int ux500_regulator_debug_exit(void)
+{
+ debugfs_remove_recursive(rdebug.dir);
+ kfree(rdebug.state_after_suspend);
+ kfree(rdebug.state_before_suspend);
+
+ return 0;
+}
+#endif
Code Review / kvmfornfv.git / blobdiff