1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Silicon Labs C2 port Linux support
4 *
5 * Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it>
6 * Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it>
7 */
8
9 #define C2PORT_NAME_LEN 32
10
11 struct device;
12
13 /*
14 * C2 port basic structs
15 */
16
17 /* Main struct */
18 struct c2port_ops;
19 struct c2port_device {
20 unsigned int access:1;
21 unsigned int flash_access:1;
22
23 int id;
24 char name[C2PORT_NAME_LEN];
25 struct c2port_ops *ops;
26 struct mutex mutex; /* prevent races during read/write */
27
28 struct device *dev;
29
30 void *private_data;
31 };
32
33 /* Basic operations */
34 struct c2port_ops {
35 /* Flash layout */
36 unsigned short block_size; /* flash block size in bytes */
37 unsigned short blocks_num; /* flash blocks number */
38
39 /* Enable or disable the access to C2 port */
40 void (*access)(struct c2port_device *dev, int status);
41
42 /* Set C2D data line as input/output */
43 void (*c2d_dir)(struct c2port_device *dev, int dir);
44
45 /* Read/write C2D data line */
46 int (*c2d_get)(struct c2port_device *dev);
47 void (*c2d_set)(struct c2port_device *dev, int status);
48
49 /* Write C2CK clock line */
50 void (*c2ck_set)(struct c2port_device *dev, int status);
51 };
52
53 /*
54 * Exported functions
55 */
56
57 extern struct c2port_device *c2port_device_register(char *name,
58 struct c2port_ops *ops, void *devdata);
59 extern void c2port_device_unregister(struct c2port_device *dev);