1 files changed, 132 insertions, 39 deletions

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 5327f35d9b5c..5b272bfd261d 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -41,13 +41,13 @@
 static bool pinctrl_dummy_state;
 
 /* Mutex taken to protect pinctrl_list */
-DEFINE_MUTEX(pinctrl_list_mutex);
+static DEFINE_MUTEX(pinctrl_list_mutex);
 
 /* Mutex taken to protect pinctrl_maps */
 DEFINE_MUTEX(pinctrl_maps_mutex);
 
 /* Mutex taken to protect pinctrldev_list */
-DEFINE_MUTEX(pinctrldev_list_mutex);
+static DEFINE_MUTEX(pinctrldev_list_mutex);
 
 /* Global list of pin control devices (struct pinctrl_dev) */
 static LIST_HEAD(pinctrldev_list);
@@ -101,20 +101,23 @@ EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
 {
 	struct pinctrl_dev *pctldev = NULL;
-	bool found = false;
 
 	if (!devname)
 		return NULL;
 
+	mutex_lock(&pinctrldev_list_mutex);
+
 	list_for_each_entry(pctldev, &pinctrldev_list, node) {
 		if (!strcmp(dev_name(pctldev->dev), devname)) {
 			/* Matched on device name */
-			found = true;
-			break;
+			mutex_unlock(&pinctrldev_list_mutex);
+			return pctldev;
 		}
 	}
 
-	return found ? pctldev : NULL;
+	mutex_unlock(&pinctrldev_list_mutex);
+
+	return NULL;
 }
 
 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
@@ -280,6 +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
@@ -326,6 +352,8 @@ static bool pinctrl_ready_for_gpio_range(unsigned gpio)
 	struct pinctrl_gpio_range *range = NULL;
 	struct gpio_chip *chip = gpio_to_chip(gpio);
 
+	mutex_lock(&pinctrldev_list_mutex);
+
 	/* Loop over the pin controllers */
 	list_for_each_entry(pctldev, &pinctrldev_list, node) {
 		/* Loop over the ranges */
@@ -334,9 +362,13 @@ static bool pinctrl_ready_for_gpio_range(unsigned gpio)
 			if (range->base + range->npins - 1 < chip->base ||
 			    range->base > chip->base + chip->ngpio - 1)
 				continue;
+			mutex_unlock(&pinctrldev_list_mutex);
 			return true;
 		}
 	}
+
+	mutex_unlock(&pinctrldev_list_mutex);
+
 	return false;
 }
 #else
@@ -408,8 +440,6 @@ struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
 {
 	struct pinctrl_dev *pctldev;
 
-	mutex_lock(&pinctrldev_list_mutex);
-
 	pctldev = get_pinctrl_dev_from_devname(devname);
 
 	/*
@@ -418,13 +448,10 @@ struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
 	 * range need to defer probing.
 	 */
 	if (!pctldev) {
-		mutex_unlock(&pinctrldev_list_mutex);
 		return ERR_PTR(-EPROBE_DEFER);
 	}
 	pinctrl_add_gpio_range(pctldev, range);
 
-	mutex_unlock(&pinctrldev_list_mutex);
-
 	return pctldev;
 }
 EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
@@ -438,21 +465,26 @@ struct pinctrl_gpio_range *
 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
 				 unsigned int pin)
 {
-	struct pinctrl_gpio_range *range = NULL;
+	struct pinctrl_gpio_range *range;
 
 	mutex_lock(&pctldev->mutex);
 	/* 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) {
-			mutex_unlock(&pctldev->mutex);
-			return range;
-		}
+		if (range->pins) {
+			int a;
+			for (a = 0; a < range->npins; a++) {
+				if (range->pins[a] == pin)
+					goto out;
+			}
+		} else if (pin >= range->pin_base &&
+			   pin < range->pin_base + range->npins)
+			goto out;
 	}
+	range = NULL;
+out:
 	mutex_unlock(&pctldev->mutex);
-
-	return NULL;
+	return range;
 }
 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
 
@@ -517,22 +549,18 @@ int pinctrl_request_gpio(unsigned gpio)
 	int ret;
 	int pin;
 
-	mutex_lock(&pinctrldev_list_mutex);
-
 	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 	if (ret) {
 		if (pinctrl_ready_for_gpio_range(gpio))
 			ret = 0;
-		mutex_unlock(&pinctrldev_list_mutex);
 		return ret;
 	}
 
 	/* 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);
 
-	mutex_unlock(&pinctrldev_list_mutex);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
@@ -552,22 +580,18 @@ void pinctrl_free_gpio(unsigned gpio)
 	int ret;
 	int pin;
 
-	mutex_lock(&pinctrldev_list_mutex);
-
 	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 	if (ret) {
-		mutex_unlock(&pinctrldev_list_mutex);
 		return;
 	}
 	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);
 
 	mutex_unlock(&pctldev->mutex);
-	mutex_unlock(&pinctrldev_list_mutex);
 }
 EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
 
@@ -578,22 +602,18 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
 	int ret;
 	int pin;
 
-	mutex_lock(&pinctrldev_list_mutex);
-
 	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 	if (ret) {
-		mutex_unlock(&pinctrldev_list_mutex);
 		return ret;
 	}
 
 	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);
-	mutex_unlock(&pinctrldev_list_mutex);
 
 	return ret;
 }
@@ -1204,6 +1224,69 @@ int pinctrl_force_default(struct pinctrl_dev *pctldev)
 }
 EXPORT_SYMBOL_GPL(pinctrl_force_default);
 
+#ifdef CONFIG_PM
+
+/**
+ * pinctrl_pm_select_default_state() - select default pinctrl state for PM
+ * @dev: device to select default state for
+ */
+int pinctrl_pm_select_default_state(struct device *dev)
+{
+	struct dev_pin_info *pins = dev->pins;
+	int ret;
+
+	if (!pins)
+		return 0;
+	if (IS_ERR(pins->default_state))
+		return 0; /* No default state */
+	ret = pinctrl_select_state(pins->p, pins->default_state);
+	if (ret)
+		dev_err(dev, "failed to activate default pinctrl state\n");
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
+
+/**
+ * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
+ * @dev: device to select sleep state for
+ */
+int pinctrl_pm_select_sleep_state(struct device *dev)
+{
+	struct dev_pin_info *pins = dev->pins;
+	int ret;
+
+	if (!pins)
+		return 0;
+	if (IS_ERR(pins->sleep_state))
+		return 0; /* No sleep state */
+	ret = pinctrl_select_state(pins->p, pins->sleep_state);
+	if (ret)
+		dev_err(dev, "failed to activate pinctrl sleep state\n");
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
+
+/**
+ * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
+ * @dev: device to select idle state for
+ */
+int pinctrl_pm_select_idle_state(struct device *dev)
+{
+	struct dev_pin_info *pins = dev->pins;
+	int ret;
+
+	if (!pins)
+		return 0;
+	if (IS_ERR(pins->idle_state))
+		return 0; /* No idle state */
+	ret = pinctrl_select_state(pins->p, pins->idle_state);
+	if (ret)
+		dev_err(dev, "failed to activate pinctrl idle state\n");
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
+#endif
+
 #ifdef CONFIG_DEBUG_FS
 
 static int pinctrl_pins_show(struct seq_file *s, void *what)
@@ -1296,11 +1379,21 @@ 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);