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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>
This commit is contained in:
Alexandre Courbot 2014-08-19 10:06:08 -07:00 committed by Linus Walleij
parent 5a2533a747
commit e46cf32ced
1 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/gpio/gpiolib-acpi.c
View File

@ -25,10 +25,12 @@ struct acpi_gpio_event {
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 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
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 @@ void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
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 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
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 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
goto out;
}
conn->pin = pin;
conn->desc = desc;
list_add_tail(&conn->node, &achip->conns);
}