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path: root/drivers/gpio/gpiolib-acpi.c
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Diffstat (limited to 'drivers/gpio/gpiolib-acpi.c')
-rw-r--r--drivers/gpio/gpiolib-acpi.c82
1 files changed, 64 insertions, 18 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index c0f6a25c3279..a7d2358736fe 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -32,9 +32,16 @@ MODULE_PARM_DESC(ignore_wake,
"controller@pin combos on which to ignore the ACPI wake flag "
"ignore_wake=controller@pin[,controller@pin[,...]]");
+static char *ignore_interrupt;
+module_param(ignore_interrupt, charp, 0444);
+MODULE_PARM_DESC(ignore_interrupt,
+ "controller@pin combos on which to ignore interrupt "
+ "ignore_interrupt=controller@pin[,controller@pin[,...]]");
+
struct acpi_gpiolib_dmi_quirk {
bool no_edge_events_on_boot;
char *ignore_wake;
+ char *ignore_interrupt;
};
/**
@@ -108,7 +115,7 @@ static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
* controller does not have GPIO chip registered at the moment. This is to
* support probe deferral.
*/
-static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
+static struct gpio_desc *acpi_get_gpiod(char *path, unsigned int pin)
{
struct gpio_chip *chip;
acpi_handle handle;
@@ -136,7 +143,7 @@ static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
* as it is intended for use outside of the GPIO layer (in a similar fashion to
* gpiod_get_index() for example) it also holds a reference to the GPIO device.
*/
-struct gpio_desc *acpi_get_and_request_gpiod(char *path, int pin, char *label)
+struct gpio_desc *acpi_get_and_request_gpiod(char *path, unsigned int pin, char *label)
{
struct gpio_desc *gpio;
int ret;
@@ -307,7 +314,8 @@ static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
if (IS_ERR(desc))
return desc;
- ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout);
+ /* ACPI uses hundredths of milliseconds units */
+ ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
if (ret)
dev_warn(chip->parent,
"Failed to set debounce-timeout for pin 0x%04X, err %d\n",
@@ -316,13 +324,15 @@ static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
return desc;
}
-static bool acpi_gpio_in_ignore_list(const char *controller_in, int pin_in)
+static bool acpi_gpio_in_ignore_list(const char *ignore_list, const char *controller_in,
+ unsigned int pin_in)
{
const char *controller, *pin_str;
- int len, pin;
+ unsigned int pin;
char *endp;
+ int len;
- controller = ignore_wake;
+ controller = ignore_list;
while (controller) {
pin_str = strchr(controller, '@');
if (!pin_str)
@@ -346,20 +356,20 @@ static bool acpi_gpio_in_ignore_list(const char *controller_in, int pin_in)
return false;
err:
- pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_wake: %s\n", ignore_wake);
+ pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_...: %s\n", ignore_list);
return false;
}
static bool acpi_gpio_irq_is_wake(struct device *parent,
struct acpi_resource_gpio *agpio)
{
- int pin = agpio->pin_table[0];
+ unsigned int pin = agpio->pin_table[0];
if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
return false;
- if (acpi_gpio_in_ignore_list(dev_name(parent), pin)) {
- dev_info(parent, "Ignoring wakeup on pin %d\n", pin);
+ if (acpi_gpio_in_ignore_list(ignore_wake, dev_name(parent), pin)) {
+ dev_info(parent, "Ignoring wakeup on pin %u\n", pin);
return false;
}
@@ -377,7 +387,8 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
struct acpi_gpio_event *event;
irq_handler_t handler = NULL;
struct gpio_desc *desc;
- int ret, pin, irq;
+ unsigned int pin;
+ int ret, irq;
if (!acpi_gpio_get_irq_resource(ares, &agpio))
return AE_OK;
@@ -386,8 +397,8 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
pin = agpio->pin_table[0];
if (pin <= 255) {
- char ev_name[5];
- sprintf(ev_name, "_%c%02hhX",
+ char ev_name[8];
+ sprintf(ev_name, "_%c%02X",
agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
pin);
if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
@@ -424,6 +435,11 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
goto fail_unlock_irq;
}
+ if (acpi_gpio_in_ignore_list(ignore_interrupt, dev_name(chip->parent), pin)) {
+ dev_info(chip->parent, "Ignoring interrupt on pin %u\n", pin);
+ return AE_OK;
+ }
+
event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event)
goto fail_unlock_irq;
@@ -684,6 +700,9 @@ int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
case ACPI_PIN_CONFIG_PULLDOWN:
*lookupflags |= GPIO_PULL_DOWN;
break;
+ case ACPI_PIN_CONFIG_NOPULL:
+ *lookupflags |= GPIO_PULL_DISABLE;
+ break;
default:
break;
}
@@ -735,6 +754,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
lookup->info.pin_config = agpio->pin_config;
lookup->info.debounce = agpio->debounce_timeout;
lookup->info.gpioint = gpioint;
+ lookup->info.wake_capable = agpio->wake_capable == ACPI_WAKE_CAPABLE;
/*
* Polarity and triggering are only specified for GpioInt
@@ -981,10 +1001,11 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
}
/**
- * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
+ * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number
* @adev: pointer to a ACPI device to get IRQ from
* @name: optional name of GpioInt resource
* @index: index of GpioInt resource (starting from %0)
+ * @wake_capable: Set to true if the IRQ is wake capable
*
* If the device has one or more GpioInt resources, this function can be
* used to translate from the GPIO offset in the resource to the Linux IRQ
@@ -996,9 +1017,13 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
* The function takes optional @name parameter. If the resource has a property
* name, then only those will be taken into account.
*
+ * The GPIO is considered wake capable if the GpioInt resource specifies
+ * SharedAndWake or ExclusiveAndWake.
+ *
* Return: Linux IRQ number (> %0) on success, negative errno on failure.
*/
-int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
+int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
+ bool *wake_capable)
{
int idx, i;
unsigned int irq_flags;
@@ -1035,7 +1060,8 @@ int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int ind
if (ret < 0)
return ret;
- ret = gpio_set_debounce_timeout(desc, info.debounce);
+ /* ACPI uses hundredths of milliseconds units */
+ ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
if (ret)
return ret;
@@ -1054,13 +1080,16 @@ int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int ind
dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
}
+ if (wake_capable)
+ *wake_capable = info.wake_capable;
+
return irq;
}
}
return -ENOENT;
}
-EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
static acpi_status
acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
@@ -1096,7 +1125,7 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
length = min_t(u16, agpio->pin_table_length, pin_index + bits);
for (i = pin_index; i < length; ++i) {
- int pin = agpio->pin_table[i];
+ unsigned int pin = agpio->pin_table[i];
struct acpi_gpio_connection *conn;
struct gpio_desc *desc;
bool found;
@@ -1556,6 +1585,20 @@ static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
.ignore_wake = "INT33FF:01@0",
},
},
+ {
+ /*
+ * Interrupt storm caused from edge triggered floating pin
+ * Found in BIOS UX325UAZ.300
+ * https://bugzilla.kernel.org/show_bug.cgi?id=216208
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX325UAZ_UM325UAZ"),
+ },
+ .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+ .ignore_interrupt = "AMDI0030:00@18",
+ },
+ },
{} /* Terminating entry */
};
@@ -1578,6 +1621,9 @@ static int __init acpi_gpio_setup_params(void)
if (ignore_wake == NULL && quirk && quirk->ignore_wake)
ignore_wake = quirk->ignore_wake;
+ if (ignore_interrupt == NULL && quirk && quirk->ignore_interrupt)
+ ignore_interrupt = quirk->ignore_interrupt;
+
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.