1 files changed, 114 insertions, 0 deletions

diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
new file mode 100644
index 000000000000..4f0abb9f1c09
--- /dev/null
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -0,0 +1,114 @@
+/*
+ * Interface the generic pinconfig portions of the pinctrl subsystem
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ * This interface is used in the core to keep track of pins.
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#ifndef __LINUX_PINCTRL_PINCONF_GENERIC_H
+#define __LINUX_PINCTRL_PINCONF_GENERIC_H
+
+/*
+ * You shouldn't even be able to compile with these enums etc unless you're
+ * using generic pin config. That is why this is defined out.
+ */
+#ifdef CONFIG_GENERIC_PINCONF
+
+/**
+ * enum pin_config_param - possible pin configuration parameters
+ * @PIN_CONFIG_BIAS_DISABLE: disable any pin bias on the pin, a
+ *      transition from say pull-up to pull-down implies that you disable
+ *      pull-up in the process, this setting disables all biasing.
+ * @PIN_CONFIG_BIAS_HIGH_IMPEDANCE: the pin will be set to a high impedance
+ *      mode, also know as "third-state" (tristate) or "high-Z" or "floating".
+ *      On output pins this effectively disconnects the pin, which is useful
+ *      if for example some other pin is going to drive the signal connected
+ *      to it for a while. Pins used for input are usually always high
+ *      impedance.
+ * @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
+ *      impedance to VDD). If the argument is != 0 pull-up is enabled,
+ *      if it is 0, pull-up is disabled.
+ * @PIN_CONFIG_BIAS_PULL_DOWN: the pin will be pulled down (usually with high
+ *      impedance to GROUND). If the argument is != 0 pull-down is enabled,
+ *      if it is 0, pull-down is disabled.
+ * @PIN_CONFIG_DRIVE_PUSH_PULL: the pin will be driven actively high and
+ *      low, this is the most typical case and is typically achieved with two
+ *      active transistors on the output. Sending this config will enabale
+ *      push-pull mode, the argument is ignored.
+ * @PIN_CONFIG_DRIVE_OPEN_DRAIN: the pin will be driven with open drain (open
+ *      collector) which means it is usually wired with other output ports
+ *      which are then pulled up with an external resistor. Sending this
+ *      config will enabale open drain mode, the argument is ignored.
+ * @PIN_CONFIG_DRIVE_OPEN_SOURCE: the pin will be driven with open source
+ *      (open emitter). Sending this config will enabale open drain mode, the
+ *      argument is ignored.
+ * @PIN_CONFIG_INPUT_SCHMITT: this will configure an input pin to run in
+ *      schmitt-trigger mode. If the schmitt-trigger has adjustable hysteresis,
+ *      the threshold value is given on a custom format as argument when
+ *      setting pins to this mode. The argument zero turns the schmitt trigger
+ *      off.
+ * @PIN_CONFIG_INPUT_DEBOUNCE: this will configure the pin to debounce mode,
+ *      which means it will wait for signals to settle when reading inputs. The
+ *      argument gives the debounce time on a custom format. Setting the
+ *      argument to zero turns debouncing off.
+ * @PIN_CONFIG_POWER_SOURCE: if the pin can select between different power
+ *      supplies, the argument to this parameter (on a custom format) tells
+ *      the driver which alternative power source to use.
+ * @PIN_CONFIG_LOW_POWER_MODE: this will configure the pin for low power
+ *      operation, if several modes of operation are supported these can be
+ *      passed in the argument on a custom form, else just use argument 1
+ *      to indicate low power mode, argument 0 turns low power mode off.
+ * @PIN_CONFIG_END: this is the last enumerator for pin configurations, if
+ *      you need to pass in custom configurations to the pin controller, use
+ *      PIN_CONFIG_END+1 as the base offset.
+ */
+enum pin_config_param {
+        PIN_CONFIG_BIAS_DISABLE,
+        PIN_CONFIG_BIAS_HIGH_IMPEDANCE,
+        PIN_CONFIG_BIAS_PULL_UP,
+        PIN_CONFIG_BIAS_PULL_DOWN,
+        PIN_CONFIG_DRIVE_PUSH_PULL,
+        PIN_CONFIG_DRIVE_OPEN_DRAIN,
+        PIN_CONFIG_DRIVE_OPEN_SOURCE,
+        PIN_CONFIG_INPUT_SCHMITT,
+        PIN_CONFIG_INPUT_DEBOUNCE,
+        PIN_CONFIG_POWER_SOURCE,
+        PIN_CONFIG_LOW_POWER_MODE,
+        PIN_CONFIG_END = 0x7FFF,
+};
+
+/*
+ * Helpful configuration macro to be used in tables etc.
+ */
+#define PIN_CONF_PACKED(p, a) ((a << 16) | ((unsigned long) p & 0xffffUL))
+
+/*
+ * The following inlines stuffs a configuration parameter and data value
+ * into and out of an unsigned long argument, as used by the generic pin config
+ * system. We put the parameter in the lower 16 bits and the argument in the
+ * upper 16 bits.
+ */
+
+static inline enum pin_config_param pinconf_to_config_param(unsigned long config)
+{
+        return (enum pin_config_param) (config & 0xffffUL);
+}
+
+static inline u16 pinconf_to_config_argument(unsigned long config)
+{
+        return (enum pin_config_param) ((config >> 16) & 0xffffUL);
+}
+
+static inline unsigned long pinconf_to_config_packed(enum pin_config_param param,
+                                                     u16 argument)
+{
+        return PIN_CONF_PACKED(param, argument);
+}
+
+#endif /* CONFIG_GENERIC_PINCONF */
+
+#endif /* __LINUX_PINCTRL_PINCONF_GENERIC_H */