1 /* 2 * Interface the pinmux subsystem 3 * 4 * Copyright (C) 2011 ST-Ericsson SA 5 * Written on behalf of Linaro for ST-Ericsson 6 * Based on bits of regulator core, gpio core and clk core 7 * 8 * Author: Linus Walleij <linus.walleij@linaro.org> 9 * 10 * License terms: GNU General Public License (GPL) version 2 11 */ 12 #ifndef __LINUX_PINCTRL_PINMUX_H 13 #define __LINUX_PINCTRL_PINMUX_H 14 15 #include <linux/list.h> 16 #include <linux/seq_file.h> 17 #include <linux/pinctrl/pinctrl.h> 18 19 #ifdef CONFIG_PINMUX 20 21 struct pinctrl_dev; 22 23 /** 24 * struct pinmux_ops - pinmux operations, to be implemented by pin controller 25 * drivers that support pinmuxing 26 * @request: called by the core to see if a certain pin can be made 27 * available for muxing. This is called by the core to acquire the pins 28 * before selecting any actual mux setting across a function. The driver 29 * is allowed to answer "no" by returning a negative error code 30 * @free: the reverse function of the request() callback, frees a pin after 31 * being requested 32 * @get_functions_count: returns number of selectable named functions available 33 * in this pinmux driver 34 * @get_function_name: return the function name of the muxing selector, 35 * called by the core to figure out which mux setting it shall map a 36 * certain device to 37 * @get_function_groups: return an array of groups names (in turn 38 * referencing pins) connected to a certain function selector. The group 39 * name can be used with the generic @pinctrl_ops to retrieve the 40 * actual pins affected. The applicable groups will be returned in 41 * @groups and the number of groups in @num_groups 42 * @set_mux: enable a certain muxing function with a certain pin group. The 43 * driver does not need to figure out whether enabling this function 44 * conflicts some other use of the pins in that group, such collisions 45 * are handled by the pinmux subsystem. The @func_selector selects a 46 * certain function whereas @group_selector selects a certain set of pins 47 * to be used. On simple controllers the latter argument may be ignored 48 * @gpio_request_enable: requests and enables GPIO on a certain pin. 49 * Implement this only if you can mux every pin individually as GPIO. The 50 * affected GPIO range is passed along with an offset(pin number) into that 51 * specific GPIO range - function selectors and pin groups are orthogonal 52 * to this, the core will however make sure the pins do not collide. 53 * @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of 54 * @gpio_request_enable 55 * @gpio_set_direction: Since controllers may need different configurations 56 * depending on whether the GPIO is configured as input or output, 57 * a direction selector function may be implemented as a backing 58 * to the GPIO controllers that need pin muxing. 59 * @strict: do not allow simultaneous use of the same pin for GPIO and another 60 * function. Check both gpio_owner and mux_owner strictly before approving 61 * the pin request. 62 */ 63 struct pinmux_ops { 64 int (*request) (struct pinctrl_dev *pctldev, unsigned offset); 65 int (*free) (struct pinctrl_dev *pctldev, unsigned offset); 66 int (*get_functions_count) (struct pinctrl_dev *pctldev); 67 const char *(*get_function_name) (struct pinctrl_dev *pctldev, 68 unsigned selector); 69 int (*get_function_groups) (struct pinctrl_dev *pctldev, 70 unsigned selector, 71 const char * const **groups, 72 unsigned *num_groups); 73 int (*set_mux) (struct pinctrl_dev *pctldev, unsigned func_selector, 74 unsigned group_selector); 75 int (*gpio_request_enable) (struct pinctrl_dev *pctldev, 76 struct pinctrl_gpio_range *range, 77 unsigned offset); 78 void (*gpio_disable_free) (struct pinctrl_dev *pctldev, 79 struct pinctrl_gpio_range *range, 80 unsigned offset); 81 int (*gpio_set_direction) (struct pinctrl_dev *pctldev, 82 struct pinctrl_gpio_range *range, 83 unsigned offset, 84 bool input); 85 bool strict; 86 }; 87 88 #endif /* CONFIG_PINMUX */ 89 90 #endif /* __LINUX_PINCTRL_PINMUX_H */ 91