1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Apple Onboard Audio GPIO definitions
4  *
5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6  */
7 
8 #ifndef __AOA_GPIO_H
9 #define __AOA_GPIO_H
10 #include <linux/workqueue.h>
11 #include <linux/mutex.h>
12 #include <asm/prom.h>
13 
14 typedef void (*notify_func_t)(void *data);
15 
16 enum notify_type {
17 	AOA_NOTIFY_HEADPHONE,
18 	AOA_NOTIFY_LINE_IN,
19 	AOA_NOTIFY_LINE_OUT,
20 };
21 
22 struct gpio_runtime;
23 struct gpio_methods {
24 	/* for initialisation/de-initialisation of the GPIO layer */
25 	void (*init)(struct gpio_runtime *rt);
26 	void (*exit)(struct gpio_runtime *rt);
27 
28 	/* turn off headphone, speakers, lineout */
29 	void (*all_amps_off)(struct gpio_runtime *rt);
30 	/* turn headphone, speakers, lineout back to previous setting */
31 	void (*all_amps_restore)(struct gpio_runtime *rt);
32 
33 	void (*set_headphone)(struct gpio_runtime *rt, int on);
34 	void (*set_speakers)(struct gpio_runtime *rt, int on);
35 	void (*set_lineout)(struct gpio_runtime *rt, int on);
36 	void (*set_master)(struct gpio_runtime *rt, int on);
37 
38 	int (*get_headphone)(struct gpio_runtime *rt);
39 	int (*get_speakers)(struct gpio_runtime *rt);
40 	int (*get_lineout)(struct gpio_runtime *rt);
41 	int (*get_master)(struct gpio_runtime *rt);
42 
43 	void (*set_hw_reset)(struct gpio_runtime *rt, int on);
44 
45 	/* use this to be notified of any events. The notification
46 	 * function is passed the data, and is called in process
47 	 * context by the use of schedule_work.
48 	 * The interface for it is that setting a function to NULL
49 	 * removes it, and they return 0 if the operation succeeded,
50 	 * and -EBUSY if the notification is already assigned by
51 	 * someone else. */
52 	int (*set_notify)(struct gpio_runtime *rt,
53 			  enum notify_type type,
54 			  notify_func_t notify,
55 			  void *data);
56 	/* returns 0 if not plugged in, 1 if plugged in
57 	 * or a negative error code */
58 	int (*get_detect)(struct gpio_runtime *rt,
59 			  enum notify_type type);
60 };
61 
62 struct gpio_notification {
63 	struct delayed_work work;
64 	notify_func_t notify;
65 	void *data;
66 	void *gpio_private;
67 	struct mutex mutex;
68 };
69 
70 struct gpio_runtime {
71 	/* to be assigned by fabric */
72 	struct device_node *node;
73 	/* since everyone needs this pointer anyway... */
74 	struct gpio_methods *methods;
75 	/* to be used by the gpio implementation */
76 	int implementation_private;
77 	struct gpio_notification headphone_notify;
78 	struct gpio_notification line_in_notify;
79 	struct gpio_notification line_out_notify;
80 };
81 
82 #endif /* __AOA_GPIO_H */
83