gpio: em: 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.

Also assign the gpio_chip.dev pointer to be used for error
messages.

ChangeLog v1->v2:
- Satisfy implicit semantics by calling .enable and .disable
  callbacks in the startup/shutdown callbacks.

Cc: Ian Molton <ian.molton@codethink.co.uk>
Cc: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-em.c b/drivers/gpio/gpio-em.c
index ec190361bf2e..1cc53516e8b4 100644
--- a/drivers/gpio/gpio-em.c
+++ b/drivers/gpio/gpio-em.c
@@ -99,6 +99,27 @@ static void em_gio_irq_enable(struct irq_data *d)
         em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d)));
 }
 
+static unsigned int em_gio_irq_startup(struct irq_data *d)
+{
+        struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
+
+        if (gpio_lock_as_irq(&p->gpio_chip, irqd_to_hwirq(d)))
+                dev_err(p->gpio_chip.dev,
+                        "unable to lock HW IRQ %lu for IRQ\n",
+                        irqd_to_hwirq(d));
+        em_gio_irq_enable(d);
+        return 0;
+}
+
+static void em_gio_irq_shutdown(struct irq_data *d)
+{
+        struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
+
+        em_gio_irq_disable(d);
+        gpio_unlock_as_irq(&p->gpio_chip, irqd_to_hwirq(d));
+}
+
+
 #define GIO_ASYNC(x) (x + 8)
 
 static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
@@ -328,6 +349,7 @@ static int em_gio_probe(struct platform_device *pdev)
         gpio_chip->request = em_gio_request;
         gpio_chip->free = em_gio_free;
         gpio_chip->label = name;
+        gpio_chip->dev = &pdev->dev;
         gpio_chip->owner = THIS_MODULE;
         gpio_chip->base = pdata->gpio_base;
         gpio_chip->ngpio = pdata->number_of_pins;
@@ -339,6 +361,8 @@ static int em_gio_probe(struct platform_device *pdev)
         irq_chip->irq_enable = em_gio_irq_enable;
         irq_chip->irq_disable = em_gio_irq_disable;
         irq_chip->irq_set_type = em_gio_irq_set_type;
+        irq_chip->irq_startup = em_gio_irq_startup;
+        irq_chip->irq_shutdown = em_gio_irq_shutdown;
         irq_chip->flags = IRQCHIP_SKIP_SET_WAKE;
 
         p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,