From 031ba28a8197a08e67b12d7ec935b24eb3638345 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Mon, 3 Oct 2016 10:40:03 +0200 Subject: gpio: acpi: separation of concerns The generic GPIO library directly implement code for acpi_find_gpio() which is only used with CONFIG_ACPI. This was probably done because OF did the same thing, but I removed that so remove this too. Rename the internal acpi_find_gpio() in gpiolib-acpi.c to acpi_populate_gpio_lookup() which seems to be more appropriate anyway so as to avoid a namespace clash with the same function. Make the stub return -ENOENT rather than -ENOSYS (as that is for syscalls!). For some reason the sunxi pin control driver was including the private gpiolib header, it works just fine without it so remove that oneliner. Cc: Rafael J. Wysocki Acked-by: Mika Westerberg Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib-acpi.c | 57 ++++++++++++++++++++++++++++++++++++++++++--- drivers/gpio/gpiolib.c | 49 -------------------------------------- drivers/gpio/gpiolib.h | 15 +++++++----- 3 files changed, 63 insertions(+), 58 deletions(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index af51461..58ece20 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -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 diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 5404cdc..f0fc3a0 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2883,55 +2883,6 @@ void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) mutex_unlock(&gpio_lookup_lock); } -static 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; -} - static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) { const char *dev_id = dev ? dev_name(dev) : NULL; diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 9ed2934..d4c139c 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -109,9 +109,11 @@ void acpi_gpiochip_remove(struct gpio_chip *chip); void acpi_gpiochip_request_interrupts(struct gpio_chip *chip); void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); -struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, - const char *propname, int index, - struct acpi_gpio_info *info); +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 gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, int index, struct acpi_gpio_info *info); @@ -130,10 +132,11 @@ static inline void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } static inline struct gpio_desc * -acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname, - int index, struct acpi_gpio_info *info) +acpi_find_gpio(struct device *dev, const char *con_id, + unsigned int idx, enum gpiod_flags flags, + enum gpio_lookup_flags *lookupflags) { - return ERR_PTR(-ENOSYS); + return ERR_PTR(-ENOENT); } static inline struct gpio_desc * acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, -- cgit v1.1