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path: root/drivers/pinctrl
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-rw-r--r--drivers/pinctrl/core.c59
1 files changed, 49 insertions, 10 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index dca9208f5463..33710b5e7bb5 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -283,6 +283,29 @@ static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
}
/**
+ * gpio_to_pin() - GPIO range GPIO number to pin number translation
+ * @range: GPIO range used for the translation
+ * @gpio: gpio pin to translate to a pin number
+ *
+ * Finds the pin number for a given GPIO using the specified GPIO range
+ * as a base for translation. The distinction between linear GPIO ranges
+ * and pin list based GPIO ranges is managed correctly by this function.
+ *
+ * This function assumes the gpio is part of the specified GPIO range, use
+ * only after making sure this is the case (e.g. by calling it on the
+ * result of successful pinctrl_get_device_gpio_range calls)!
+ */
+static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
+ unsigned int gpio)
+{
+ unsigned int offset = gpio - range->base;
+ if (range->pins)
+ return range->pins[offset];
+ else
+ return range->pin_base + offset;
+}
+
+/**
* pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
* @pctldev: pin controller device to check
* @gpio: gpio pin to check taken from the global GPIO pin space
@@ -448,8 +471,14 @@ pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
/* 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) {
+ if (range->pins) {
+ int a;
+ for (a = 0; a < range->npins; a++) {
+ if (range->pins[a] == pin)
+ return range;
+ }
+ } else if (pin >= range->pin_base &&
+ pin < range->pin_base + range->npins) {
mutex_unlock(&pctldev->mutex);
return range;
}
@@ -529,7 +558,7 @@ int pinctrl_request_gpio(unsigned gpio)
}
/* Convert to the pin controllers number space */
- pin = gpio - range->base + range->pin_base;
+ pin = gpio_to_pin(range, gpio);
ret = pinmux_request_gpio(pctldev, range, pin, gpio);
@@ -559,7 +588,7 @@ void pinctrl_free_gpio(unsigned gpio)
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
- pin = gpio - range->base + range->pin_base;
+ pin = gpio_to_pin(range, gpio);
pinmux_free_gpio(pctldev, pin, range);
@@ -582,7 +611,7 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
- pin = gpio - range->base + range->pin_base;
+ pin = gpio_to_pin(range, gpio);
ret = pinmux_gpio_direction(pctldev, range, pin, input);
mutex_unlock(&pctldev->mutex);
@@ -1349,11 +1378,21 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
- seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
- range->id, range->name,
- range->base, (range->base + range->npins - 1),
- range->pin_base,
- (range->pin_base + range->npins - 1));
+ if (range->pins) {
+ int a;
+ seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
+ range->id, range->name,
+ range->base, (range->base + range->npins - 1));
+ for (a = 0; a < range->npins - 1; a++)
+ seq_printf(s, "%u, ", range->pins[a]);
+ seq_printf(s, "%u}\n", range->pins[a]);
+ }
+ else
+ seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
+ range->id, range->name,
+ range->base, (range->base + range->npins - 1),
+ range->pin_base,
+ (range->pin_base + range->npins - 1));
}
mutex_unlock(&pctldev->mutex);
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