[PATCH 5/7] pinctrl: add function to retrieve range from pin
From: Linus Walleij <hidden>
Date: 2012-11-20 14:05:19
Also in:
lkml
Subsystem:
pin control subsystem, the rest · Maintainers:
Linus Walleij, Linus Torvalds
From: Linus Walleij <redacted> This adds a function to the pinctrl core to retrieve the GPIO range associated with a certain pin for a certain controller. This is needed when a pinctrl driver want to look up the corresponding struct gpio_chip for a certain pin. As the GPIO drivers can now create these ranges themselves, the pinctrl driver no longer knows about all its associated GPIO chips. Signed-off-by: Linus Walleij <redacted> --- drivers/pinctrl/core.c | 24 ++++++++++++++++++++++++ include/linux/pinctrl/pinctrl.h | 3 +++ 2 files changed, 27 insertions(+)
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 33af811..5cdee86 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c@@ -364,6 +364,30 @@ struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range); /** + * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin + * @pctldev: the pin controller device to look in + * @pin: a controller-local number to find the range for + */ +struct pinctrl_gpio_range * +pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, + unsigned int pin) +{ + struct pinctrl_gpio_range *range = NULL; + + /* Loop over the ranges */ + list_for_each_entry(range, &pctldev->gpio_ranges, node) { + /* Check if we're in the valid range */ + if (pin >= range->pin_base && + pin < range->pin_base + range->npins) { + return range; + } + } + + return NULL; +} +EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin); + +/** * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller * @pctldev: pin controller device to remove the range from * @range: the GPIO range to remove
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index 7dee9ac..04d6700 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h@@ -139,6 +139,9 @@ extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, struct pinctrl_gpio_range *range); +extern struct pinctrl_gpio_range * +pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, + unsigned int pin); #ifdef CONFIG_OF extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
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1.7.11.3