2304b4737f
struct pinctrl_dev's pin_desc_tree_lock and pinctrl_hogs_lock aren't useful; the data they protect is read-only except when registering or unregistering a pinctrl_dev, and at those times, it doesn't make sense to protect one part of the structure independently from the rest. Move pinctrl_init_device_debugfs() to the end of pinctrl_register() so that debugfs can't access the struct pinctrl_dev until it's fully initialized, i.e. after the hogs are set up. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
107 lines
3.4 KiB
C
107 lines
3.4 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/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
|
|
* @gpio_ranges_lock: lock for the GPIO ranges list
|
|
* @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
|
|
* @pinctrl_hogs: list of pin control maps hogged by 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 mutex gpio_ranges_lock;
|
|
struct device *dev;
|
|
struct module *owner;
|
|
void *driver_data;
|
|
struct list_head pinctrl_hogs;
|
|
#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
|
|
* @usecount: the number of active users of this pin controller setting, used
|
|
* to keep track of nested use cases
|
|
* @pctldev: pin control device handling this pin control handle
|
|
* @mutex: a lock for the pin control state holder
|
|
* @func_selector: the function selector for the pinmux device handling
|
|
* this pinmux
|
|
* @groups: the group selectors for the pinmux device and
|
|
* selector combination handling this pinmux, this is a list that
|
|
* will be traversed on all pinmux operations such as
|
|
* get/put/enable/disable
|
|
*/
|
|
struct pinctrl {
|
|
struct list_head node;
|
|
struct device *dev;
|
|
unsigned usecount;
|
|
struct pinctrl_dev *pctldev;
|
|
struct mutex mutex;
|
|
#ifdef CONFIG_PINMUX
|
|
unsigned func_selector;
|
|
struct list_head groups;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
* @lock: a lock to protect the descriptor structure
|
|
* @mux_requested: whether the pin is already requested by pinmux or not
|
|
* @mux_function: a named muxing function for the pin that will be passed to
|
|
* subdrivers and shown in debugfs etc
|
|
*/
|
|
struct pin_desc {
|
|
struct pinctrl_dev *pctldev;
|
|
const char *name;
|
|
bool dynamic_name;
|
|
spinlock_t lock;
|
|
/* These fields only added when supporting pinmux drivers */
|
|
#ifdef CONFIG_PINMUX
|
|
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);
|
|
}
|