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 #define C2PORT_NAME_LEN 32 13 14 struct device; 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 extern struct c2port_device *c2port_device_register(char *name, 61 struct c2port_ops *ops, void *devdata); 62 extern void c2port_device_unregister(struct c2port_device *dev); 63