drivers/adb_bus.h

   1 /*
   2  * ADB bus definitions for Open Hack'Ware
   3  *
   4  * Copyright (c) 2004-2005 Jocelyn Mayer
   5  *
   6  *   This program is free software; you can redistribute it and/or
   7  *   modify it under the terms of the GNU General Public License V2
   8  *   as published by the Free Software Foundation
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
  18  */
  19
  20 typedef struct adb_bus_t adb_bus_t;
  21 typedef struct adb_dev_t adb_dev_t;
  22
  23 #define ADB_BUF_SIZE 8
  24 struct adb_bus_t {
  25     void *host;
  26     int (*req)(void *host, const uint8_t *snd_buf, int len, uint8_t *rcv_buf);
  27     adb_dev_t *devices;
  28 };
  29
  30 struct adb_dev_t {
  31     adb_dev_t *next;
  32     adb_bus_t *bus;
  33     uint8_t addr;
  34     uint8_t type;
  35     void *state;
  36 };
  37
  38 #define ADB_BUF_SIZE 8
  39
  40 /* ADB commands */
  41 enum {
  42     ADB_SEND_RESET = 0x00,
  43     ADB_FLUSH      = 0x01,
  44     ADB_LISTEN     = 0x08,
  45     ADB_TALK       = 0x0C,
  46 };
  47 /* ADB default IDs before relocation */
  48 enum {
  49     ADB_PROTECT    = 0x01,
  50     ADB_KEYBD      = 0x02,
  51     ADB_MOUSE      = 0x03,
  52     ADB_ABS        = 0x04,
  53     ADB_MODEM      = 0x05,
  54     ADB_RES        = 0x06,
  55     ADB_MISC       = 0x07,
  56 };
  57 /* ADB special device handlers IDs */
  58 enum {
  59     ADB_CHADDR        = 0x00,
  60     ADB_CHADDR_ACTIV  = 0xFD,
  61     ADB_CHADDR_NOCOLL = 0xFE,
  62     ADB_SELF_TEST     = 0xFF,
  63 };
  64
  65 int adb_cmd (adb_dev_t *dev, uint8_t cmd, uint8_t reg,
  66              uint8_t *buf, int len);
  67 void adb_bus_reset (adb_bus_t *bus);
  68 adb_bus_t *adb_bus_new (void *host,
  69                         int (*req)(void *host, const uint8_t *snd_buf,
  70                                    int len, uint8_t *rcv_buf));
  71 int adb_bus_init (char *path, adb_bus_t *bus);
  72
  73 static inline int adb_reset (adb_bus_t *bus)
  74 {
  75     adb_dev_t fake_device;
  76
  77     memset(&fake_device, 0, sizeof(adb_dev_t));
  78     fake_device.bus = bus;
  79
  80     return adb_cmd(&fake_device, ADB_SEND_RESET, 0, NULL, 0);
  81 }
  82
  83 static inline int adb_flush (adb_dev_t *dev)
  84 {
  85     return adb_cmd(dev, ADB_FLUSH, 0, NULL, 0);
  86 }
  87
  88 static inline int adb_reg_get (adb_dev_t *dev, uint8_t reg, uint8_t *buf)
  89 {
  90     return adb_cmd(dev, ADB_TALK, reg, buf, 0);
  91 }
  92
  93 static inline int adb_reg_set (adb_dev_t *dev, uint8_t reg,
  94                                uint8_t *buf, int len)
  95 {
  96     return adb_cmd(dev, ADB_LISTEN, reg, buf, len);
  97 }
  98
  99 #ifdef DEBUG_ADB
 100 #define ADB_DPRINTF(fmt, args...) \
 101 do { printk("ADB - %s: " fmt, __func__ , ##args); } while (0)
 102 #else
 103 #define ADB_DPRINTF(fmt, args...) do { } while (0)
 104 #endif