1 files changed, 241 insertions, 0 deletions

diff --git a/drivers/regulator/dbx500-prcmu.c b/drivers/regulator/dbx500-prcmu.c
new file mode 100644
index 000000000000..f2e5ecdc5864
--- /dev/null
+++ b/drivers/regulator/dbx500-prcmu.c
@@ -0,0 +1,241 @@
+/*
+ * 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 "dbx500-prcmu.h"
+
+/*
+ * power state reference count
+ */
+static int power_state_active_cnt; /* will initialize to zero */
+static DEFINE_SPINLOCK(power_state_active_lock);
+
+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;
+}
+
+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 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)
+{
+        struct device *dev = s->private;
+        int err;
+
+        /* print power state count */
+        err = seq_printf(s, "ux500-regulator power state count: %i\n",
+                power_state_active_get());
+        if (err < 0)
+                dev_err(dev, "seq_printf overflow\n");
+
+        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)
+{
+        struct device *dev = s->private;
+        int err;
+        int i;
+
+        /* print dump header */
+        err = seq_printf(s, "ux500-regulator status:\n");
+        if (err < 0)
+                dev_err(dev, "seq_printf overflow\n");
+
+        err = seq_printf(s, "%31s : %8s : %8s\n", "current",
+                "before", "after");
+        if (err < 0)
+                dev_err(dev, "seq_printf overflow\n");
+
+        for (i = 0; i < rdebug.num_regulators; i++) {
+                struct dbx500_regulator_info *info;
+                /* Access per-regulator data */
+                info = &rdebug.regulator_array[i];
+
+                /* print status */
+                err = 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");
+                if (err < 0)
+                        dev_err(dev, "seq_printf overflow\n");
+        }
+
+        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 __devinit
+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) {
+                dev_err(&pdev->dev,
+                        "could not allocate memory for saving state\n");
+                goto exit_destroy_power_state;
+        }
+
+        rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
+        if (!rdebug.state_after_suspend) {
+                dev_err(&pdev->dev,
+                        "could not allocate memory for saving state\n");
+                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 __devexit ux500_regulator_debug_exit(void)
+{
+        debugfs_remove_recursive(rdebug.dir);
+        kfree(rdebug.state_after_suspend);
+        kfree(rdebug.state_before_suspend);
+
+        return 0;
+}
+#endif