126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
/*
|
|
* Core private header for the pin control subsystem
|
|
*
|
|
* Copyright (C) 2011 ST-Ericsson SA
|
|
* Written on behalf of Linaro for ST-Ericsson
|
|
*
|
|
* Author: Linus Walleij <linus.walleij@linaro.org>
|
|
*
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
*/
|
|
|
|
#include <linux/mutex.h>
|
|
#include <linux/radix-tree.h>
|
|
#include <linux/pinctrl/pinconf.h>
|
|
|
|
struct pinctrl_gpio_range;
|
|
|
|
/**
|
|
* struct pinctrl_dev - pin control class device
|
|
* @node: node to include this pin controller in the global pin controller list
|
|
* @desc: the pin controller descriptor supplied when initializing this pin
|
|
* controller
|
|
* @pin_desc_tree: each pin descriptor for this pin controller is stored in
|
|
* this radix tree
|
|
* @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
|
|
* ranges are added to this list at runtime
|
|
* @dev: the device entry for this pin controller
|
|
* @owner: module providing the pin controller, used for refcounting
|
|
* @driver_data: driver data for drivers registering to the pin controller
|
|
* subsystem
|
|
* @p: result of pinctrl_get() for this device
|
|
* @device_root: debugfs root for this device
|
|
*/
|
|
struct pinctrl_dev {
|
|
struct list_head node;
|
|
struct pinctrl_desc *desc;
|
|
struct radix_tree_root pin_desc_tree;
|
|
struct list_head gpio_ranges;
|
|
struct device *dev;
|
|
struct module *owner;
|
|
void *driver_data;
|
|
struct pinctrl *p;
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *device_root;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* struct pinctrl - per-device pin control state holder
|
|
* @node: global list node
|
|
* @dev: the device using this pin control handle
|
|
* @states: a list of states for this device
|
|
* @state: the current state
|
|
*/
|
|
struct pinctrl {
|
|
struct list_head node;
|
|
struct device *dev;
|
|
struct list_head states;
|
|
struct pinctrl_state *state;
|
|
};
|
|
|
|
/**
|
|
* struct pinctrl_state - a pinctrl state for a device
|
|
* @node: list not for struct pinctrl's @states field
|
|
* @name: the name of this state
|
|
* @settings: a list of settings for this state
|
|
*/
|
|
struct pinctrl_state {
|
|
struct list_head node;
|
|
const char *name;
|
|
struct list_head settings;
|
|
};
|
|
|
|
/**
|
|
* struct pinctrl_setting - an individual mux setting
|
|
* @node: list node for struct pinctrl_settings's @settings field
|
|
* @pctldev: pin control device handling to be programmed
|
|
* @group_selector: the group selector to program
|
|
* @func_selector: the function selector to program
|
|
*/
|
|
struct pinctrl_setting {
|
|
struct list_head node;
|
|
struct pinctrl_dev *pctldev;
|
|
unsigned group_selector;
|
|
unsigned func_selector;
|
|
};
|
|
|
|
/**
|
|
* struct pin_desc - pin descriptor for each physical pin in the arch
|
|
* @pctldev: corresponding pin control device
|
|
* @name: a name for the pin, e.g. the name of the pin/pad/finger on a
|
|
* datasheet or such
|
|
* @dynamic_name: if the name of this pin was dynamically allocated
|
|
* @usecount: If zero, the pin is not claimed, and @owner should be NULL.
|
|
* If non-zero, this pin is claimed by @owner. This field is an integer
|
|
* rather than a boolean, since pinctrl_get() might process multiple
|
|
* mapping table entries that refer to, and hence claim, the same group
|
|
* or pin, and each of these will increment the @usecount.
|
|
* @owner: The name of the entity owning the pin. Typically, this is the name
|
|
* of the device that called pinctrl_get(). Alternatively, it may be the
|
|
* name of the GPIO passed to pinctrl_request_gpio().
|
|
*/
|
|
struct pin_desc {
|
|
struct pinctrl_dev *pctldev;
|
|
const char *name;
|
|
bool dynamic_name;
|
|
/* These fields only added when supporting pinmux drivers */
|
|
#ifdef CONFIG_PINMUX
|
|
unsigned usecount;
|
|
const char *owner;
|
|
#endif
|
|
};
|
|
|
|
struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
|
|
int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
|
|
int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
|
|
const char *pin_group);
|
|
|
|
static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
|
|
unsigned int pin)
|
|
{
|
|
return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
|
|
}
|
|
|
|
extern struct mutex pinctrl_mutex;
|