diff options
Diffstat (limited to 'drivers/gpio/gpiolib-acpi.c')
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 57 |
1 files changed, 54 insertions, 3 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index af514618d7fb..58ece201b8e6 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -14,6 +14,7 @@ #include <linux/gpio.h> #include <linux/gpio/consumer.h> #include <linux/gpio/driver.h> +#include <linux/gpio/machine.h> #include <linux/export.h> #include <linux/acpi.h> #include <linux/interrupt.h> @@ -395,7 +396,7 @@ struct acpi_gpio_lookup { int n; }; -static int acpi_find_gpio(struct acpi_resource *ares, void *data) +static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data) { struct acpi_gpio_lookup *lookup = data; @@ -440,7 +441,8 @@ static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup, INIT_LIST_HEAD(&res_list); - ret = acpi_dev_get_resources(lookup->adev, &res_list, acpi_find_gpio, + ret = acpi_dev_get_resources(lookup->adev, &res_list, + acpi_populate_gpio_lookup, lookup); if (ret < 0) return ret; @@ -513,7 +515,7 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, * Note: if the GPIO resource has multiple entries in the pin list, this * function only returns the first. */ -struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, +static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname, int index, struct acpi_gpio_info *info) { @@ -546,6 +548,55 @@ struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, return ret ? ERR_PTR(ret) : lookup.desc; } +struct gpio_desc *acpi_find_gpio(struct device *dev, + const char *con_id, + unsigned int idx, + enum gpiod_flags flags, + enum gpio_lookup_flags *lookupflags) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); + struct acpi_gpio_info info; + struct gpio_desc *desc; + char propname[32]; + int i; + + /* Try first from _DSD */ + for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { + if (con_id && strcmp(con_id, "gpios")) { + snprintf(propname, sizeof(propname), "%s-%s", + con_id, gpio_suffixes[i]); + } else { + snprintf(propname, sizeof(propname), "%s", + gpio_suffixes[i]); + } + + desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); + if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) + break; + } + + /* Then from plain _CRS GPIOs */ + if (IS_ERR(desc)) { + if (!acpi_can_fallback_to_crs(adev, con_id)) + return ERR_PTR(-ENOENT); + + desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); + if (IS_ERR(desc)) + return desc; + + if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) && + info.gpioint) { + dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); + return ERR_PTR(-ENOENT); + } + } + + if (info.polarity == GPIO_ACTIVE_LOW) + *lookupflags |= GPIO_ACTIVE_LOW; + + return desc; +} + /** * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources * @fwnode: pointer to an ACPI firmware node to get the GPIO information from |