aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--Documentation/gpio/driver.txt3
-rw-r--r--drivers/gpio/gpio-stmpe.c18
-rw-r--r--drivers/gpio/gpio-tc3589x.c5
-rw-r--r--drivers/gpio/gpiolib.c34
4 files changed, 38 insertions, 22 deletions
diff --git a/Documentation/gpio/driver.txt b/Documentation/gpio/driver.txt
index 23b751a10d7b..31e0b5db55d8 100644
--- a/Documentation/gpio/driver.txt
+++ b/Documentation/gpio/driver.txt
@@ -124,7 +124,8 @@ symbol:
* gpiochip_set_chained_irqchip(): sets up a chained irq handler for a
gpio_chip from a parent IRQ and passes the struct gpio_chip* as handler
data. (Notice handler data, since the irqchip data is likely used by the
- parent irqchip!) This is for the chained type of chip.
+ parent irqchip!) This is for the chained type of chip. This is also used
+ to set up a nested irqchip if NULL is passed as handler.
To use the helpers please keep the following in mind:
diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 845025a57240..b0b342787c37 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -308,6 +308,12 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
if (ret)
goto out_free;
+ ret = gpiochip_add(&stmpe_gpio->chip);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
+ goto out_disable;
+ }
+
if (irq > 0) {
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
stmpe_gpio_irq, IRQF_ONESHOT,
@@ -324,14 +330,13 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
if (ret) {
dev_err(&pdev->dev,
"could not connect irqchip to gpiochip\n");
- return ret;
+ goto out_disable;
}
- }
- ret = gpiochip_add(&stmpe_gpio->chip);
- if (ret) {
- dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
- goto out_disable;
+ gpiochip_set_chained_irqchip(&stmpe_gpio->chip,
+ &stmpe_gpio_irq_chip,
+ irq,
+ NULL);
}
if (pdata && pdata->setup)
@@ -343,6 +348,7 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
out_disable:
stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
+ gpiochip_remove(&stmpe_gpio->chip);
out_free:
kfree(stmpe_gpio);
return ret;
diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c
index 7324869c38e0..ae0f6466eb09 100644
--- a/drivers/gpio/gpio-tc3589x.c
+++ b/drivers/gpio/gpio-tc3589x.c
@@ -300,6 +300,11 @@ static int tc3589x_gpio_probe(struct platform_device *pdev)
return ret;
}
+ gpiochip_set_chained_irqchip(&tc3589x_gpio->chip,
+ &tc3589x_gpio_irq_chip,
+ irq,
+ NULL);
+
if (pdata && pdata->setup)
pdata->setup(tc3589x, tc3589x_gpio->chip.base);
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9362b5b817af..6e00c82be142 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -385,13 +385,14 @@ static struct gpio_chip *find_chip_by_name(const char *name)
*/
/**
- * gpiochip_add_chained_irqchip() - adds a chained irqchip to a gpiochip
- * @gpiochip: the gpiochip to add the irqchip to
- * @irqchip: the irqchip to add to the gpiochip
+ * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip
+ * @gpiochip: the gpiochip to set the irqchip chain to
+ * @irqchip: the irqchip to chain to the gpiochip
* @parent_irq: the irq number corresponding to the parent IRQ for this
* chained irqchip
* @parent_handler: the parent interrupt handler for the accumulated IRQ
- * coming out of the gpiochip
+ * coming out of the gpiochip. If the interrupt is nested rather than
+ * cascaded, pass NULL in this handler argument
*/
void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
struct irq_chip *irqchip,
@@ -400,23 +401,26 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
{
unsigned int offset;
- if (gpiochip->can_sleep) {
- chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n");
- return;
- }
if (!gpiochip->irqdomain) {
chip_err(gpiochip, "called %s before setting up irqchip\n",
__func__);
return;
}
- irq_set_chained_handler(parent_irq, parent_handler);
-
- /*
- * The parent irqchip is already using the chip_data for this
- * irqchip, so our callbacks simply use the handler_data.
- */
- irq_set_handler_data(parent_irq, gpiochip);
+ if (parent_handler) {
+ if (gpiochip->can_sleep) {
+ chip_err(gpiochip,
+ "you cannot have chained interrupts on a "
+ "chip that may sleep\n");
+ return;
+ }
+ irq_set_chained_handler(parent_irq, parent_handler);
+ /*
+ * The parent irqchip is already using the chip_data for this
+ * irqchip, so our callbacks simply use the handler_data.
+ */
+ irq_set_handler_data(parent_irq, gpiochip);
+ }
/* Set the parent IRQ for all affected IRQs */
for (offset = 0; offset < gpiochip->ngpio; offset++)

Privacy Policy