1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * Copyright (C) 2015 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de> |
4 | */ |
5 | |
6 | #include <linux/device.h> |
7 | |
8 | #define to_siox_device(_dev) container_of((_dev), struct siox_device, dev) |
9 | struct siox_device { |
10 | struct list_head node; /* node in smaster->devices */ |
11 | struct siox_master *smaster; |
12 | struct device dev; |
13 | |
14 | const char *type; |
15 | size_t inbytes; |
16 | size_t outbytes; |
17 | u8 statustype; |
18 | |
19 | u8 status_read_clean; |
20 | u8 status_written; |
21 | u8 status_written_lastcycle; |
22 | bool connected; |
23 | |
24 | /* statistics */ |
25 | unsigned int watchdog_errors; |
26 | unsigned int status_errors; |
27 | |
28 | struct kernfs_node *status_errors_kn; |
29 | struct kernfs_node *watchdog_kn; |
30 | struct kernfs_node *watchdog_errors_kn; |
31 | struct kernfs_node *connected_kn; |
32 | }; |
33 | |
34 | bool siox_device_synced(struct siox_device *sdevice); |
35 | bool siox_device_connected(struct siox_device *sdevice); |
36 | |
37 | struct siox_driver { |
38 | int (*probe)(struct siox_device *sdevice); |
39 | void (*remove)(struct siox_device *sdevice); |
40 | void (*shutdown)(struct siox_device *sdevice); |
41 | |
42 | /* |
43 | * buf is big enough to hold sdev->inbytes - 1 bytes, the status byte |
44 | * is in the scope of the framework. |
45 | */ |
46 | int (*set_data)(struct siox_device *sdevice, u8 status, u8 buf[]); |
47 | /* |
48 | * buf is big enough to hold sdev->outbytes - 1 bytes, the status byte |
49 | * is in the scope of the framework |
50 | */ |
51 | int (*get_data)(struct siox_device *sdevice, const u8 buf[]); |
52 | |
53 | struct device_driver driver; |
54 | }; |
55 | |
56 | static inline struct siox_driver *to_siox_driver(struct device_driver *driver) |
57 | { |
58 | if (driver) |
59 | return container_of(driver, struct siox_driver, driver); |
60 | else |
61 | return NULL; |
62 | } |
63 | |
64 | int __siox_driver_register(struct siox_driver *sdriver, struct module *owner); |
65 | |
66 | static inline int siox_driver_register(struct siox_driver *sdriver) |
67 | { |
68 | return __siox_driver_register(sdriver, THIS_MODULE); |
69 | } |
70 | |
71 | static inline void siox_driver_unregister(struct siox_driver *sdriver) |
72 | { |
73 | return driver_unregister(drv: &sdriver->driver); |
74 | } |
75 | |
76 | /* |
77 | * module_siox_driver() - Helper macro for drivers that don't do |
78 | * anything special in module init/exit. This eliminates a lot of |
79 | * boilerplate. Each module may only use this macro once, and |
80 | * calling it replaces module_init() and module_exit() |
81 | */ |
82 | #define module_siox_driver(__siox_driver) \ |
83 | module_driver(__siox_driver, siox_driver_register, \ |
84 | siox_driver_unregister) |
85 | |