mfd: ab8500-debugfs: Add interrupt debug

This patch adds an entry in debugfs to check number of interrupts
from the AB.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Reviewed-by: Rabin VINCENT <rabin.vincent@stericsson.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index d228697f5d9b..05a7af4b9768 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -521,6 +521,7 @@ static irqreturn_t ab8500_irq(int irq, void *dev)
                         int virq = ab8500_irq_get_virq(ab8500, line);
 
                         handle_nested_irq(virq);
+                        ab8500_debug_register_interrupt(line);
                         value &= ~(1 << bit);
 
                 } while (value);
diff --git a/drivers/mfd/ab8500-debugfs.c b/drivers/mfd/ab8500-debugfs.c
index 8617b132e730..cbebbd7e7b40 100644
--- a/drivers/mfd/ab8500-debugfs.c
+++ b/drivers/mfd/ab8500-debugfs.c
@@ -737,6 +737,35 @@ static ssize_t ab8500_val_write(struct file *file,
 }
 
 /*
+ * Interrupt status
+ */
+static u32 num_interrupts[AB8500_MAX_NR_IRQS];
+static int num_interrupt_lines;
+
+void ab8500_debug_register_interrupt(int line)
+{
+        if (line < num_interrupt_lines)
+                num_interrupts[line]++;
+}
+
+static int ab8500_interrupts_print(struct seq_file *s, void *p)
+{
+        int line;
+
+        seq_printf(s, "irq:  number of\n");
+
+        for (line = 0; line < num_interrupt_lines; line++)
+                seq_printf(s, "%3i:  %6i\n", line, num_interrupts[line]);
+
+        return 0;
+}
+
+static int ab8500_interrupts_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, ab8500_interrupts_print, inode->i_private);
+}
+
+/*
  * - HWREG DB8500 formated routines
  */
 static int ab8500_hwreg_print(struct seq_file *s, void *d)
@@ -1489,6 +1518,14 @@ static const struct file_operations ab8500_val_fops = {
         .owner = THIS_MODULE,
 };
 
+static const struct file_operations ab8500_interrupts_fops = {
+        .open = ab8500_interrupts_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+        .owner = THIS_MODULE,
+};
+
 static const struct file_operations ab8500_subscribe_fops = {
         .open = ab8500_subscribe_unsubscribe_open,
         .write = ab8500_subscribe_write,
@@ -1597,6 +1634,18 @@ static int ab8500_debug_probe(struct platform_device *plf)
         if (!file)
                 goto err;
 
+        if (is_ab8500(ab8500))
+                num_interrupt_lines = AB8500_NR_IRQS;
+        else if (is_ab8505(ab8500))
+                num_interrupt_lines = AB8505_NR_IRQS;
+        else if (is_ab9540(ab8500))
+                num_interrupt_lines = AB9540_NR_IRQS;
+
+        file = debugfs_create_file("interrupts", (S_IRUGO),
+            ab8500_dir, &plf->dev, &ab8500_interrupts_fops);
+        if (!file)
+                goto err;
+
         file = debugfs_create_file("irq-unsubscribe", (S_IRUGO | S_IWUSR),
             ab8500_dir, &plf->dev, &ab8500_unsubscribe_fops);
         if (!file)