mfd: ab8500-debugfs: Allow number of IRQs to be provided more dynamically

With the introduction of new AB* platforms, it's important to allow
as much code reuse as possible. By allowing a system's number of IRQs
to be dynamically passed, we can reuse almost all of the -debugfs
driver.
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com>

drivers/mfd/ab8500-debugfs.c

@@ -94,10 +94,11 @@ static u32 debug_address;
 
 static int irq_first;
 static int irq_last;
-static u32 irq_count[AB8500_NR_IRQS];
+static u32 *irq_count;
+static int num_irqs;
 
-static struct device_attribute *dev_attr[AB8500_NR_IRQS];
-static char *event_name[AB8500_NR_IRQS];
+static struct device_attribute **dev_attr;
+static char **event_name;
 
 /**
  * struct ab8500_reg_range
@@ -483,7 +484,7 @@ static irqreturn_t ab8500_debug_handler(int irq, void *data)
 	struct kobject *kobj = (struct kobject *)data;
 	unsigned int irq_abb = irq - irq_first;
 
-	if (irq_abb < AB8500_NR_IRQS)
+	if (irq_abb < num_irqs)
 		irq_count[irq_abb]++;
 	/*
 	 * This makes it possible to use poll for events (POLLPRI | POLLERR)
@@ -1340,7 +1341,7 @@ static ssize_t show_irq(struct device *dev,
 		return err;
 
 	irq_index = name - irq_first;
-	if (irq_index >= AB8500_NR_IRQS)
+	if (irq_index >= num_irqs)
 		return -EINVAL;
 	else
 		return sprintf(buf, "%u\n", irq_count[irq_index]);
@@ -1376,7 +1377,7 @@ static ssize_t ab8500_subscribe_write(struct file *file,
 	}
 
 	irq_index = user_val - irq_first;
-	if (irq_index >= AB8500_NR_IRQS)
+	if (irq_index >= num_irqs)
 		return -EINVAL;
 
 	/*
@@ -1440,7 +1441,7 @@ static ssize_t ab8500_unsubscribe_write(struct file *file,
 	}
 
 	irq_index = user_val - irq_first;
-	if (irq_index >= AB8500_NR_IRQS)
+	if (irq_index >= num_irqs)
 		return -EINVAL;
 
 	/* Set irq count to 0 when unsubscribe */
@@ -1521,21 +1522,40 @@ static struct dentry *ab8500_gpadc_dir;
 static int ab8500_debug_probe(struct platform_device *plf)
 {
 	struct dentry *file;
+	int ret = -ENOMEM;
+	struct ab8500 *ab8500;
 	debug_bank = AB8500_MISC;
 	debug_address = AB8500_REV_REG & 0x00FF;
 
+	ab8500 = dev_get_drvdata(plf->dev.parent);
+	num_irqs = ab8500->mask_size;
+
+	irq_count = kzalloc(sizeof(irq_count)*num_irqs, GFP_KERNEL);
+	if (!irq_count)
+		return -ENOMEM;
+
+	dev_attr = kzalloc(sizeof(*dev_attr)*num_irqs,GFP_KERNEL);
+	if (!dev_attr)
+		goto out_freeirq_count;
+
+	event_name = kzalloc(sizeof(*event_name)*num_irqs, GFP_KERNEL);
+	if (!event_name)
+		goto out_freedev_attr;
+
 	irq_first = platform_get_irq_byname(plf, "IRQ_FIRST");
 	if (irq_first < 0) {
 		dev_err(&plf->dev, "First irq not found, err %d\n",
 				irq_first);
-		return irq_first;
+		ret = irq_first;
+		goto out_freeevent_name;
 	}
 
 	irq_last = platform_get_irq_byname(plf, "IRQ_LAST");
 	if (irq_last < 0) {
 		dev_err(&plf->dev, "Last irq not found, err %d\n",
 				irq_last);
-		return irq_last;
+		ret = irq_last;
+                goto out_freeevent_name;
 	}
 
 	ab8500_dir = debugfs_create_dir(AB8500_NAME_STRING, NULL);
@@ -1658,12 +1678,23 @@ static int ab8500_debug_probe(struct platform_device *plf)
 	if (ab8500_dir)
 		debugfs_remove_recursive(ab8500_dir);
 	dev_err(&plf->dev, "failed to create debugfs entries.\n");
-	return -ENOMEM;
+out_freeevent_name:
+	kfree(event_name);
+out_freedev_attr:
+	kfree(dev_attr);
+out_freeirq_count:
+	kfree(irq_count);
+
+	return ret;
 }
 
 static int ab8500_debug_remove(struct platform_device *plf)
 {
 	debugfs_remove_recursive(ab8500_dir);
+	kfree(event_name);
+	kfree(dev_attr);
+	kfree(irq_count);
+
 	return 0;
 }