diff options
author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-11-12 01:19:05 +0300 |
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committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2022-11-15 13:19:58 +0300 |
commit | 16ba046e86e93f42117efe7ca7a7940b83c60afc (patch) | |
tree | d21dce7551bdfe52d43deca045660766bb6f4f8c /drivers/gpio/gpiolib-acpi.c | |
parent | 2b6bce80ae70b91134a5731d85076042ae90c300 (diff) | |
download | linux-16ba046e86e93f42117efe7ca7a7940b83c60afc.tar.xz |
gpiolib: acpi: teach acpi_find_gpio() to handle data-only nodes
In preparation of switching all ACPI-based GPIO lookups to go through
acpi_find_gpio() we need to make sure it can handle data-only ACPI
nodes, same as existing acpi_node_get_gpiod().
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib-acpi.c')
-rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 76 |
1 files changed, 50 insertions, 26 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 61b311e4560f..bd36fac20ea0 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -864,8 +864,9 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, * function only returns the first. */ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, - const char *propname, int index, - struct acpi_gpio_info *info) + const char *propname, + int index, + struct acpi_gpio_info *info) { struct acpi_gpio_lookup lookup; int ret; @@ -896,6 +897,44 @@ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, return ret ? ERR_PTR(ret) : lookup.desc; } +/** + * acpi_get_gpiod_from_data() - get a GPIO descriptor from ACPI data node + * @fwnode: pointer to an ACPI firmware node to get the GPIO information from + * @propname: Property name of the GPIO + * @index: index of GpioIo/GpioInt resource (starting from %0) + * @info: info pointer to fill in (optional) + * + * This function uses the property-based GPIO lookup to get to the GPIO + * resource with the relevant information from a data-only ACPI firmware node + * and uses that to obtain the GPIO descriptor to return. + * + * If the GPIO cannot be translated or there is an error an ERR_PTR is + * returned. + */ +static struct gpio_desc *acpi_get_gpiod_from_data(struct fwnode_handle *fwnode, + const char *propname, + int index, + struct acpi_gpio_info *info) +{ + struct acpi_gpio_lookup lookup; + int ret; + + if (!is_acpi_data_node(fwnode)) + return ERR_PTR(-ENODEV); + + if (!propname) + return ERR_PTR(-EINVAL); + + lookup.index = index; + + ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); + if (ret) + return ERR_PTR(ret); + + ret = acpi_gpio_resource_lookup(&lookup, info); + return ret ? ERR_PTR(ret) : lookup.desc; +} + static bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id) { @@ -912,16 +951,12 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, enum gpiod_flags *dflags, unsigned long *lookupflags) { - struct acpi_device *adev; + struct acpi_device *adev = to_acpi_device_node(fwnode); struct acpi_gpio_info info; struct gpio_desc *desc; char propname[32]; int i; - adev = to_acpi_device_node(fwnode); - if (!adev) - return ERR_PTR(-ENODEV); - /* Try first from _DSD */ for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { if (con_id) { @@ -932,7 +967,12 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, gpio_suffixes[i]); } - desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); + if (adev) + desc = acpi_get_gpiod_by_index(adev, + propname, idx, &info); + else + desc = acpi_get_gpiod_from_data(fwnode, + propname, idx, &info); if (!IS_ERR(desc)) break; if (PTR_ERR(desc) == -EPROBE_DEFER) @@ -941,7 +981,7 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, /* Then from plain _CRS GPIOs */ if (IS_ERR(desc)) { - if (!acpi_can_fallback_to_crs(adev, con_id)) + if (!adev || !acpi_can_fallback_to_crs(adev, con_id)) return ERR_PTR(-ENOENT); desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); @@ -979,29 +1019,13 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, int index, struct acpi_gpio_info *info) { - struct acpi_gpio_lookup lookup; struct acpi_device *adev; - int ret; adev = to_acpi_device_node(fwnode); if (adev) return acpi_get_gpiod_by_index(adev, propname, index, info); - if (!is_acpi_data_node(fwnode)) - return ERR_PTR(-ENODEV); - - if (!propname) - return ERR_PTR(-EINVAL); - - memset(&lookup, 0, sizeof(lookup)); - lookup.index = index; - - ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); - if (ret) - return ERR_PTR(ret); - - ret = acpi_gpio_resource_lookup(&lookup, info); - return ret ? ERR_PTR(ret) : lookup.desc; + return acpi_get_gpiod_from_data(fwnode, propname, index, info); } /** |