gpio: acpi: normalize use of gpiochip_get_desc()
GPIO descriptors are changing from unique and permanent tokens to
allocated resources. Therefore gpiochip_get_desc() cannot be used as a
way to obtain a global GPIO descriptor anymore.
This patch updates the gpiolib ACPI support code to keep and use the
descriptor returned by a centralized call to gpiochip_get_desc().
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index d62eaaa..8454002 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -25,10 +25,12 @@
acpi_handle handle;
unsigned int pin;
unsigned int irq;
+ struct gpio_desc *desc;
};
struct acpi_gpio_connection {
struct list_head node;
+ unsigned int pin;
struct gpio_desc *desc;
};
@@ -197,6 +199,7 @@
event->handle = evt_handle;
event->irq = irq;
event->pin = pin;
+ event->desc = desc;
ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
"ACPI:Event", event);
@@ -280,7 +283,7 @@
struct gpio_desc *desc;
free_irq(event->irq, event);
- desc = gpiochip_get_desc(chip, event->pin);
+ desc = event->desc;
if (WARN_ON(IS_ERR(desc)))
continue;
gpio_unlock_as_irq(chip, event->pin);
@@ -406,24 +409,26 @@
struct gpio_desc *desc;
bool found;
- desc = gpiochip_get_desc(chip, pin);
- if (IS_ERR(desc)) {
- status = AE_ERROR;
- goto out;
- }
-
mutex_lock(&achip->conn_lock);
found = false;
list_for_each_entry(conn, &achip->conns, node) {
- if (conn->desc == desc) {
+ if (conn->pin == pin) {
found = true;
+ desc = conn->desc;
break;
}
}
if (!found) {
int ret;
+ desc = gpiochip_get_desc(chip, pin);
+ if (IS_ERR(desc)) {
+ status = AE_ERROR;
+ mutex_unlock(&achip->conn_lock);
+ goto out;
+ }
+
ret = gpiochip_request_own_desc(desc, "ACPI:OpRegion");
if (ret) {
status = AE_ERROR;
@@ -462,6 +467,7 @@
goto out;
}
+ conn->pin = pin;
conn->desc = desc;
list_add_tail(&conn->node, &achip->conns);
}