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Diffstat (limited to 'kernel/drivers/pinctrl/core.h')
| -rw-r--r-- | kernel/drivers/pinctrl/core.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/kernel/drivers/pinctrl/core.h b/kernel/drivers/pinctrl/core.h new file mode 100644 index 000000000..b24ea846c --- /dev/null +++ b/kernel/drivers/pinctrl/core.h @@ -0,0 +1,199 @@ +/* + * 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/kref.h> +#include <linux/mutex.h> +#include <linux/radix-tree.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/machine.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 + * @hog_default: default state for pins hogged by this device + * @hog_sleep: sleep state for pins hogged by this device + * @mutex: mutex taken on each pin controller specific action + * @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; + struct pinctrl_state *hog_default; + struct pinctrl_state *hog_sleep; + struct mutex mutex; +#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 + * @dt_maps: the mapping table chunks dynamically parsed from device tree for + * this device, if any + * @users: reference count + */ +struct pinctrl { + struct list_head node; + struct device *dev; + struct list_head states; + struct pinctrl_state *state; + struct list_head dt_maps; + struct kref users; +}; + +/** + * struct pinctrl_state - a pinctrl state for a device + * @node: list node 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_mux - setting data for MAP_TYPE_MUX_GROUP + * @group: the group selector to program + * @func: the function selector to program + */ +struct pinctrl_setting_mux { + unsigned group; + unsigned func; +}; + +/** + * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_* + * @group_or_pin: the group selector or pin ID to program + * @configs: a pointer to an array of config parameters/values to program into + * hardware. Each individual pin controller defines the format and meaning + * of config parameters. + * @num_configs: the number of entries in array @configs + */ +struct pinctrl_setting_configs { + unsigned group_or_pin; + unsigned long *configs; + unsigned num_configs; +}; + +/** + * struct pinctrl_setting - an individual mux or config setting + * @node: list node for struct pinctrl_settings's @settings field + * @type: the type of setting + * @pctldev: pin control device handling to be programmed. Not used for + * PIN_MAP_TYPE_DUMMY_STATE. + * @dev_name: the name of the device using this state + * @data: Data specific to the setting type + */ +struct pinctrl_setting { + struct list_head node; + enum pinctrl_map_type type; + struct pinctrl_dev *pctldev; + const char *dev_name; + union { + struct pinctrl_setting_mux mux; + struct pinctrl_setting_configs configs; + } data; +}; + +/** + * 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 + * @mux_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. + * @mux_owner: The name of device that called pinctrl_get(). + * @mux_setting: The most recent selected mux setting for this pin, if any. + * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is + * the name of the GPIO that "owns" this pin. + */ +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 mux_usecount; + const char *mux_owner; + const struct pinctrl_setting_mux *mux_setting; + const char *gpio_owner; +#endif +}; + +/** + * struct pinctrl_maps - a list item containing part of the mapping table + * @node: mapping table list node + * @maps: array of mapping table entries + * @num_maps: the number of entries in @maps + */ +struct pinctrl_maps { + struct list_head node; + struct pinctrl_map const *maps; + unsigned num_maps; +}; + +struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name); +struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np); +int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name); +const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin); +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); +} + +int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, + bool dup); +void pinctrl_unregister_map(struct pinctrl_map const *map); + +extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev); +extern int pinctrl_force_default(struct pinctrl_dev *pctldev); + +extern struct mutex pinctrl_maps_mutex; +extern struct list_head pinctrl_maps; + +#define for_each_maps(_maps_node_, _i_, _map_) \ + list_for_each_entry(_maps_node_, &pinctrl_maps, node) \ + for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \ + _i_ < _maps_node_->num_maps; \ + _i_++, _map_ = &_maps_node_->maps[_i_]) |