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1 | /* |
2 | * Silicon Labs C2 port Linux support | |
3 | * | |
4 | * Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it> | |
5 | * Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as published by | |
9 | * the Free Software Foundation | |
10 | */ | |
11 | ||
12 | #include <linux/device.h> | |
13 | ||
14 | #define C2PORT_NAME_LEN 32 | |
15 | ||
16 | /* | |
17 | * C2 port basic structs | |
18 | */ | |
19 | ||
20 | /* Main struct */ | |
21 | struct c2port_ops; | |
22 | struct c2port_device { | |
23 | unsigned int access:1; | |
24 | unsigned int flash_access:1; | |
25 | ||
26 | int id; | |
27 | char name[C2PORT_NAME_LEN]; | |
28 | struct c2port_ops *ops; | |
29 | struct mutex mutex; /* prevent races during read/write */ | |
30 | ||
31 | struct device *dev; | |
32 | ||
33 | void *private_data; | |
34 | }; | |
35 | ||
36 | /* Basic operations */ | |
37 | struct c2port_ops { | |
38 | /* Flash layout */ | |
39 | unsigned short block_size; /* flash block size in bytes */ | |
40 | unsigned short blocks_num; /* flash blocks number */ | |
41 | ||
42 | /* Enable or disable the access to C2 port */ | |
43 | void (*access)(struct c2port_device *dev, int status); | |
44 | ||
45 | /* Set C2D data line as input/output */ | |
46 | void (*c2d_dir)(struct c2port_device *dev, int dir); | |
47 | ||
48 | /* Read/write C2D data line */ | |
49 | int (*c2d_get)(struct c2port_device *dev); | |
50 | void (*c2d_set)(struct c2port_device *dev, int status); | |
51 | ||
52 | /* Write C2CK clock line */ | |
53 | void (*c2ck_set)(struct c2port_device *dev, int status); | |
54 | }; | |
55 | ||
56 | /* | |
57 | * Exported functions | |
58 | */ | |
59 | ||
60 | #define to_class_dev(obj) container_of((obj), struct class_device, kobj) | |
61 | #define to_c2port_device(obj) container_of((obj), struct c2port_device, class) | |
62 | ||
63 | extern struct c2port_device *c2port_device_register(char *name, | |
64 | struct c2port_ops *ops, void *devdata); | |
65 | extern void c2port_device_unregister(struct c2port_device *dev); |