Some GPIO based rfkill devices can wake their host up from suspend by
toggling an input (from the host perspective) GPIO.
This patch adds a generic support for that feature by registering a
threaded interrupt routine and thus setting the corresponding GPIO as a
wake up source.
Signed-off-by: Loic Poulain <loic.poul...@intel.com>
---
net/rfkill/rfkill-gpio.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
index 29369d6..2f6aad1 100644
--- a/net/rfkill/rfkill-gpio.c
+++ b/net/rfkill/rfkill-gpio.c
@@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
#include <linux/rfkill-gpio.h>
@@ -36,6 +37,8 @@ struct rfkill_gpio_data {
struct gpio_desc *shutdown_gpio;
struct gpio_desc *wake_gpio;
+ int host_wake_irq;
+
struct rfkill *rfkill_dev;
struct clk *clk;
@@ -48,6 +51,7 @@ struct rfkill_gpio_desc {
int reset_idx;
int shutdown_idx;
int wake_idx;
+ int host_wake_idx;
};
static int rfkill_gpio_set_power(void *data, bool blocked)
@@ -73,6 +77,15 @@ static const struct rfkill_ops rfkill_gpio_ops = {
.set_block = rfkill_gpio_set_power,
};
+static irqreturn_t rfkill_gpio_host_wake(int irq, void *dev)
+{
+ struct rfkill_gpio_data *rfkill = dev;
+
+ pr_info("Host wake IRQ for %s\n", rfkill->name);
+
+ return IRQ_HANDLED;
+}
+
static int rfkill_gpio_init(struct device *dev, struct rfkill_gpio_desc *desc)
{
int ret;
@@ -125,6 +138,34 @@ static int rfkill_gpio_init(struct device *dev, struct
rfkill_gpio_desc *desc)
}
}
+ rfkill->host_wake_irq = -1;
+
+ if (desc && (desc->host_wake_idx >= 0)) {
+ gpio = devm_gpiod_get_index(dev, "host_wake",
+ desc->host_wake_idx);
+ if (!IS_ERR(gpio)) {
+ int irqf = IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND |
+ IRQF_ONESHOT;
+
+ ret = gpiod_direction_input(gpio);
+ if (ret)
+ return ret;
+
+ rfkill->host_wake_irq = gpiod_to_irq(gpio);
+ ret = devm_request_threaded_irq(dev,
+ rfkill->host_wake_irq,
+ NULL,
+ rfkill_gpio_host_wake,
+ irqf, "host_wake",
+ rfkill);
+ if (ret)
+ return ret;
+
+ /* Wakeup IRQ, only used in suspend */
+ disable_irq(rfkill->host_wake_irq);
+ }
+ }
+
/* Make sure at-least one of the GPIO is defined */
if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
dev_err(dev, "invalid platform data\n");
@@ -205,6 +246,9 @@ static int rfkill_gpio_suspend(struct device *dev)
if (!rfkill->clk_enabled)
return 0;
+ if (rfkill->host_wake_irq >= 0)
+ enable_irq(rfkill->host_wake_irq);
+
gpiod_set_value_cansleep(rfkill->wake_gpio, 0);
return 0;
@@ -219,6 +263,9 @@ static int rfkill_gpio_resume(struct device *dev)
if (!rfkill->clk_enabled)
return 0;
+ if (rfkill->host_wake_irq >= 0)
+ disable_irq(rfkill->host_wake_irq);
+
gpiod_set_value_cansleep(rfkill->wake_gpio, 1);
return 0;
@@ -243,6 +290,7 @@ static struct rfkill_gpio_desc acpi_default_bluetooth = {
.reset_idx = 0,
.shutdown_idx = 1,
.wake_idx = -1,
+ .host_wake_idx = -1,
};
static struct rfkill_gpio_desc acpi_default_gps = {
@@ -250,6 +298,7 @@ static struct rfkill_gpio_desc acpi_default_gps = {
.reset_idx = 0,
.shutdown_idx = 1,
.wake_idx = -1,
+ .host_wake_idx = -1,
};
static const struct acpi_device_id rfkill_acpi_match[] = {
--
1.8.3.2
--
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