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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Sven Peter <sven@fail0verflow.com> | |
5 | * Copyright (C) 2010 Haxx Enterprises <bushing@gmail.com> | |
6 | * All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or | |
9 | * without modification, are permitted provided that the following | |
10 | * conditions are met: | |
11 | * | |
12 | * * Redistributions of source code must retain the above copyright notice, | |
13 | * this list of conditions and the following disclaimer. | |
14 | * | |
15 | * * Redistributions in binary form must reproduce the above copyright notice, | |
16 | * this list of conditions and the following disclaimer in the documentation | |
17 | * and/or other materials provided with the distribution. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | |
29 | * THE POSSIBILITY OF SUCH DAMAGE. | |
30 | */ | |
31 | ||
32 | #include <config.h> | |
33 | #include <stdio.h> | |
34 | #include <libusb.h> | |
35 | #include <libsigrok/libsigrok.h> | |
36 | #include "libsigrok-internal.h" | |
37 | #include "gl_usb.h" | |
38 | #include "protocol.h" | |
39 | ||
40 | #define CTRL_IN (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN | \ | |
41 | LIBUSB_RECIPIENT_INTERFACE) | |
42 | #define CTRL_OUT (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT | \ | |
43 | LIBUSB_RECIPIENT_INTERFACE) | |
44 | #define EP1_BULK_IN (LIBUSB_ENDPOINT_IN | 1) | |
45 | ||
46 | #define TIMEOUT_MS (5 * 1000) | |
47 | ||
48 | enum { | |
49 | REQ_READBULK = 0x82, | |
50 | REQ_WRITEADDR, | |
51 | REQ_READDATA, | |
52 | REQ_WRITEDATA, | |
53 | }; | |
54 | ||
55 | static int gl_write_address(libusb_device_handle *devh, unsigned int address) | |
56 | { | |
57 | unsigned char packet[8] = { address & 0xFF }; | |
58 | int ret; | |
59 | ||
60 | ret = libusb_control_transfer(devh, CTRL_OUT, 0xc, REQ_WRITEADDR, | |
61 | 0, packet, 1, TIMEOUT_MS); | |
62 | if (ret != 1) | |
63 | sr_err("%s: %s.", __func__, libusb_error_name(ret)); | |
64 | return ret; | |
65 | } | |
66 | ||
67 | static int gl_write_data(libusb_device_handle *devh, unsigned int val) | |
68 | { | |
69 | unsigned char packet[8] = { val & 0xFF }; | |
70 | int ret; | |
71 | ||
72 | ret = libusb_control_transfer(devh, CTRL_OUT, 0xc, REQ_WRITEDATA, | |
73 | 0, packet, 1, TIMEOUT_MS); | |
74 | if (ret != 1) | |
75 | sr_err("%s: %s.", __func__, libusb_error_name(ret)); | |
76 | return ret; | |
77 | } | |
78 | ||
79 | static int gl_read_data(libusb_device_handle *devh) | |
80 | { | |
81 | unsigned char packet[8] = { 0 }; | |
82 | int ret; | |
83 | ||
84 | ret = libusb_control_transfer(devh, CTRL_IN, 0xc, REQ_READDATA, | |
85 | 0, packet, 1, TIMEOUT_MS); | |
86 | if (ret != 1) | |
87 | sr_err("%s: %s, val=%hhx.", __func__, | |
88 | libusb_error_name(ret), packet[0]); | |
89 | return (ret == 1) ? packet[0] : ret; | |
90 | } | |
91 | ||
92 | SR_PRIV int gl_read_bulk(libusb_device_handle *devh, void *buffer, | |
93 | unsigned int size) | |
94 | { | |
95 | unsigned char packet[8] = { | |
96 | 0, 0, 0, 0, size & 0xff, (size & 0xff00) >> 8, | |
97 | (size & 0xff0000) >> 16, (size & 0xff000000) >> 24 | |
98 | }; | |
99 | int ret, transferred = 0; | |
100 | ||
101 | ret = libusb_control_transfer(devh, CTRL_OUT, 0x4, REQ_READBULK, | |
102 | 0, packet, 8, TIMEOUT_MS); | |
103 | if (ret != 8) | |
104 | sr_err("%s: libusb_control_transfer: %s.", __func__, | |
105 | libusb_error_name(ret)); | |
106 | ||
107 | ret = libusb_bulk_transfer(devh, EP1_BULK_IN, buffer, size, | |
108 | &transferred, TIMEOUT_MS); | |
109 | if (ret < 0) | |
110 | sr_err("%s: libusb_bulk_transfer: %s.", __func__, | |
111 | libusb_error_name(ret)); | |
112 | return transferred; | |
113 | } | |
114 | ||
115 | SR_PRIV int gl_reg_write(libusb_device_handle *devh, unsigned int reg, | |
116 | unsigned int val) | |
117 | { | |
118 | int ret; | |
119 | ||
120 | ret = gl_write_address(devh, reg); | |
121 | if (ret < 0) | |
122 | return ret; | |
123 | ret = gl_write_data(devh, val); | |
124 | return ret; | |
125 | } | |
126 | ||
127 | SR_PRIV int gl_reg_read(libusb_device_handle *devh, unsigned int reg) | |
128 | { | |
129 | int ret; | |
130 | ||
131 | ret = gl_write_address(devh, reg); | |
132 | if (ret < 0) | |
133 | return ret; | |
134 | ret = gl_read_data(devh); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | SR_PRIV int gl_reg_read_buf(libusb_device_handle *devh, unsigned int reg, | |
139 | unsigned char *buf, unsigned int len) | |
140 | { | |
141 | int ret; | |
142 | unsigned int i; | |
143 | ||
144 | ret = gl_write_address(devh, reg); | |
145 | if (ret < 0) | |
146 | return ret; | |
147 | for (i = 0; i < len; i++) { | |
148 | ret = gl_read_data(devh); | |
149 | if (ret < 0) | |
150 | return ret; | |
151 | buf[i] = ret; | |
152 | } | |
153 | return 0; | |
154 | } |