gpio: intel-mid: lock IRQs when starting them

This uses the new API for tagging GPIO lines as in use by
IRQs. This enforces a few semantic checks on how the underlying
GPIO line is used.

ChangeLog v1->v2:
- Explicitly call the - empty - mask/unmask functions from the
  startup/shutdown hooks. These are currently empty, but maybe
  they will not be that forever, so better be safe than sorry.

Acked-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-intel-mid.c b/drivers/gpio/gpio-intel-mid.c
index be803af658ac..039de0e6cf16 100644
--- a/drivers/gpio/gpio-intel-mid.c
+++ b/drivers/gpio/gpio-intel-mid.c
@@ -235,11 +235,33 @@ static void intel_mid_irq_mask(struct irq_data *d)
 {
 }
 
+static unsigned int intel_mid_irq_startup(struct irq_data *d)
+{
+        struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
+
+        if (gpio_lock_as_irq(&priv->chip, irqd_to_hwirq(d)))
+                dev_err(priv->chip.dev,
+                        "unable to lock HW IRQ %lu for IRQ\n",
+                        irqd_to_hwirq(d));
+        intel_mid_irq_unmask(d);
+        return 0;
+}
+
+static void intel_mid_irq_shutdown(struct irq_data *d)
+{
+        struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
+
+        intel_mid_irq_mask(d);
+        gpio_unlock_as_irq(&priv->chip, irqd_to_hwirq(d));
+}
+
 static struct irq_chip intel_mid_irqchip = {
         .name           = "INTEL_MID-GPIO",
         .irq_mask       = intel_mid_irq_mask,
         .irq_unmask     = intel_mid_irq_unmask,
         .irq_set_type   = intel_mid_irq_type,
+        .irq_startup    = intel_mid_irq_startup,
+        .irq_shutdown   = intel_mid_irq_shutdown,
 };
 
 static const struct intel_mid_gpio_ddata gpio_lincroft = {
@@ -418,6 +440,7 @@ static int intel_gpio_probe(struct pci_dev *pdev,
 
         priv->reg_base = pcim_iomap_table(pdev)[0];
         priv->chip.label = dev_name(&pdev->dev);
+        priv->chip.dev = &pdev->dev;
         priv->chip.request = intel_gpio_request;
         priv->chip.direction_input = intel_gpio_direction_input;
         priv->chip.direction_output = intel_gpio_direction_output;