2 * Copyright (c) 1998, 2001 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/queue.h>
32 #include <dev/iicbus/iic.h>
35 #define IICPRI (PZERO+8) /* XXX sleep/wakeup queue priority */
40 * How tsleep() is called in iic_request_bus().
42 #define IIC_DONTWAIT 0
46 #define IIC_INTRWAIT (IIC_INTR | IIC_WAIT)
51 #define IIC_MASTER 0x1
53 #define IIC_POLLED 0x4
58 #define IIC_UNKNOWN 0x0
61 #define IIC_FASTEST 0x3
63 #define IIC_LAST_READ 0x1
68 #define IIC_REQUEST_BUS 0x1
69 #define IIC_RELEASE_BUS 0x2
74 #define INTR_GENERAL 0x1 /* general call received */
75 #define INTR_START 0x2 /* the I2C interface is addressed */
76 #define INTR_STOP 0x3 /* stop condition received */
77 #define INTR_RECEIVE 0x4 /* character received */
78 #define INTR_TRANSMIT 0x5 /* character to transmit */
79 #define INTR_ERROR 0x6 /* error */
80 #define INTR_NOACK 0x7 /* no ack from master receiver */
83 * adapter layer errors
85 #define IIC_NOERR 0x0 /* no error occured */
86 #define IIC_EBUSERR 0x1 /* bus error (hardware not in expected state) */
87 #define IIC_ENOACK 0x2 /* ack not received until timeout */
88 #define IIC_ETIMEOUT 0x3 /* timeout */
89 #define IIC_EBUSBSY 0x4 /* bus busy (reserved by another client) */
90 #define IIC_ESTATUS 0x5 /* status error */
91 #define IIC_EUNDERFLOW 0x6 /* slave ready for more data */
92 #define IIC_EOVERFLOW 0x7 /* too much data */
93 #define IIC_ENOTSUPP 0x8 /* request not supported */
94 #define IIC_ENOADDR 0x9 /* no address assigned to the interface */
95 #define IIC_ERESOURCE 0xa /* resources (memory, whatever) unavailable */
98 * Note that all iicbus functions return IIC_Exxxxx status values,
99 * except iic2errno() (obviously) and iicbus_started() (returns bool).
101 extern int iic2errno(int);
102 extern int iicbus_request_bus(device_t, device_t, int);
103 extern int iicbus_release_bus(device_t, device_t);
104 extern device_t iicbus_alloc_bus(device_t);
106 extern void iicbus_intr(device_t, int, char *);
108 extern int iicbus_null_repeated_start(device_t, u_char);
109 extern int iicbus_null_callback(device_t, int, caddr_t);
111 #define iicbus_reset(bus,speed,addr,oldaddr) \
112 (IICBUS_RESET(device_get_parent(bus), speed, addr, oldaddr))
114 /* basic I2C operations */
115 extern int iicbus_started(device_t);
116 extern int iicbus_start(device_t, u_char, int);
117 extern int iicbus_stop(device_t);
118 extern int iicbus_repeated_start(device_t, u_char, int);
119 extern int iicbus_write(device_t, const char *, int, int *, int);
120 extern int iicbus_read(device_t, char *, int, int *, int, int);
122 /* single byte read/write functions, start/stop not managed */
123 extern int iicbus_write_byte(device_t, char, int);
124 extern int iicbus_read_byte(device_t, char *, int);
126 /* Read/write operations with start/stop conditions managed */
127 extern int iicbus_block_write(device_t, u_char, char *, int, int *);
128 extern int iicbus_block_read(device_t, u_char, char *, int, int *);
130 /* vectors of iic operations to pass to bridge */
131 int iicbus_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs);
132 int iicbus_transfer_excl(device_t bus, struct iic_msg *msgs, uint32_t nmsgs,
134 int iicbus_transfer_gen(device_t bus, struct iic_msg *msgs, uint32_t nmsgs);
136 #define IICBUS_MODVER 1
137 #define IICBUS_MINVER 1
138 #define IICBUS_MAXVER 1
139 #define IICBUS_PREFVER IICBUS_MODVER
141 extern driver_t iicbb_driver;
142 extern devclass_t iicbb_devclass;
144 #define IICBB_MODVER 1
145 #define IICBB_MINVER 1
146 #define IICBB_MAXVER 1
147 #define IICBB_PREFVER IICBB_MODVER