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Diffstat (limited to 'kernel/include/linux/pinctrl/pinctrl.h')
| -rw-r--r-- | kernel/include/linux/pinctrl/pinctrl.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/kernel/include/linux/pinctrl/pinctrl.h b/kernel/include/linux/pinctrl/pinctrl.h new file mode 100644 index 000000000..66e469751 --- /dev/null +++ b/kernel/include/linux/pinctrl/pinctrl.h @@ -0,0 +1,190 @@ +/* + * Interface 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_PINCTRL_H +#define __LINUX_PINCTRL_PINCTRL_H + +#ifdef CONFIG_PINCTRL + +#include <linux/radix-tree.h> +#include <linux/list.h> +#include <linux/seq_file.h> +#include <linux/pinctrl/pinctrl-state.h> + +struct device; +struct pinctrl_dev; +struct pinctrl_map; +struct pinmux_ops; +struct pinconf_ops; +struct pin_config_item; +struct gpio_chip; +struct device_node; + +/** + * struct pinctrl_pin_desc - boards/machines provide information on their + * pins, pads or other muxable units in this struct + * @number: unique pin number from the global pin number space + * @name: a name for this pin + * @drv_data: driver-defined per-pin data. pinctrl core does not touch this + */ +struct pinctrl_pin_desc { + unsigned number; + const char *name; + void *drv_data; +}; + +/* Convenience macro to define a single named or anonymous pin descriptor */ +#define PINCTRL_PIN(a, b) { .number = a, .name = b } +#define PINCTRL_PIN_ANON(a) { .number = a } + +/** + * struct pinctrl_gpio_range - each pin controller can provide subranges of + * the GPIO number space to be handled by the controller + * @node: list node for internal use + * @name: a name for the chip in this range + * @id: an ID number for the chip in this range + * @base: base offset of the GPIO range + * @pin_base: base pin number of the GPIO range if pins == NULL + * @pins: enumeration of pins in GPIO range or NULL + * @npins: number of pins in the GPIO range, including the base number + * @gc: an optional pointer to a gpio_chip + */ +struct pinctrl_gpio_range { + struct list_head node; + const char *name; + unsigned int id; + unsigned int base; + unsigned int pin_base; + unsigned const *pins; + unsigned int npins; + struct gpio_chip *gc; +}; + +/** + * struct pinctrl_ops - global pin control operations, to be implemented by + * pin controller drivers. + * @get_groups_count: Returns the count of total number of groups registered. + * @get_group_name: return the group name of the pin group + * @get_group_pins: return an array of pins corresponding to a certain + * group selector @pins, and the size of the array in @num_pins + * @pin_dbg_show: optional debugfs display hook that will provide per-device + * info for a certain pin in debugfs + * @dt_node_to_map: parse a device tree "pin configuration node", and create + * mapping table entries for it. These are returned through the @map and + * @num_maps output parameters. This function is optional, and may be + * omitted for pinctrl drivers that do not support device tree. + * @dt_free_map: free mapping table entries created via @dt_node_to_map. The + * top-level @map pointer must be freed, along with any dynamically + * allocated members of the mapping table entries themselves. This + * function is optional, and may be omitted for pinctrl drivers that do + * not support device tree. + */ +struct pinctrl_ops { + int (*get_groups_count) (struct pinctrl_dev *pctldev); + const char *(*get_group_name) (struct pinctrl_dev *pctldev, + unsigned selector); + int (*get_group_pins) (struct pinctrl_dev *pctldev, + unsigned selector, + const unsigned **pins, + unsigned *num_pins); + void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s, + unsigned offset); + int (*dt_node_to_map) (struct pinctrl_dev *pctldev, + struct device_node *np_config, + struct pinctrl_map **map, unsigned *num_maps); + void (*dt_free_map) (struct pinctrl_dev *pctldev, + struct pinctrl_map *map, unsigned num_maps); +}; + +/** + * struct pinctrl_desc - pin controller descriptor, register this to pin + * control subsystem + * @name: name for the pin controller + * @pins: an array of pin descriptors describing all the pins handled by + * this pin controller + * @npins: number of descriptors in the array, usually just ARRAY_SIZE() + * of the pins field above + * @pctlops: pin control operation vtable, to support global concepts like + * grouping of pins, this is optional. + * @pmxops: pinmux operations vtable, if you support pinmuxing in your driver + * @confops: pin config operations vtable, if you support pin configuration in + * your driver + * @owner: module providing the pin controller, used for refcounting + * @num_custom_params: Number of driver-specific custom parameters to be parsed + * from the hardware description + * @custom_params: List of driver_specific custom parameters to be parsed from + * the hardware description + * @custom_conf_items: Information how to print @params in debugfs, must be + * the same size as the @custom_params, i.e. @num_custom_params + */ +struct pinctrl_desc { + const char *name; + struct pinctrl_pin_desc const *pins; + unsigned int npins; + const struct pinctrl_ops *pctlops; + const struct pinmux_ops *pmxops; + const struct pinconf_ops *confops; + struct module *owner; +#ifdef CONFIG_GENERIC_PINCONF + unsigned int num_custom_params; + const struct pinconf_generic_params *custom_params; + const struct pin_config_item *custom_conf_items; +#endif +}; + +/* External interface to pin controller */ +extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, + struct device *dev, void *driver_data); +extern void pinctrl_unregister(struct pinctrl_dev *pctldev); +extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin); +extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range); +extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *ranges, + unsigned nranges); +extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range); + +extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, + struct pinctrl_gpio_range *range); +extern struct pinctrl_gpio_range * +pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, + unsigned int pin); +extern int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, + const char *pin_group, const unsigned **pins, + unsigned *num_pins); + +#ifdef CONFIG_OF +extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np); +#else +static inline +struct pinctrl_dev *of_pinctrl_get(struct device_node *np) +{ + return NULL; +} +#endif /* CONFIG_OF */ + +extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev); +extern const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev); +extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev); +#else + +struct pinctrl_dev; + +/* Sufficiently stupid default functions when pinctrl is not in use */ +static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) +{ + return pin >= 0; +} + +#endif /* !CONFIG_PINCTRL */ + +#endif /* __LINUX_PINCTRL_PINCTRL_H */ |