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31034792 ML |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 Martin Ling <martin-sigrok@earth.li> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include "libsigrok.h" | |
21 | #include "libsigrok-internal.h" | |
22 | ||
23 | #include <glib.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | #include <fcntl.h> | |
27 | #include <errno.h> | |
28 | ||
3544f848 | 29 | #define LOG_PREFIX "scpi_usbtmc" |
31034792 | 30 | |
05c644ea ML |
31 | #define MAX_READ_LENGTH 2048 |
32 | ||
33 | struct usbtmc_scpi { | |
34 | struct sr_usbtmc_dev_inst *usbtmc; | |
35 | char response_buffer[MAX_READ_LENGTH]; | |
36 | int response_length; | |
37 | int response_bytes_read; | |
38 | }; | |
39 | ||
17bdda58 AJ |
40 | static int scpi_usbtmc_dev_inst_new(void *priv, struct drv_context *drvc, |
41 | const char *resource, char **params, const char *serialcomm) | |
f754c146 AJ |
42 | { |
43 | struct usbtmc_scpi *uscpi = priv; | |
44 | ||
17bdda58 | 45 | (void)drvc; |
f754c146 AJ |
46 | (void)params; |
47 | (void)serialcomm; | |
48 | ||
49 | if (!(uscpi->usbtmc = sr_usbtmc_dev_inst_new(resource))) | |
50 | return SR_ERR; | |
51 | ||
52 | return SR_OK; | |
53 | } | |
54 | ||
d87c1766 | 55 | static int scpi_usbtmc_open(void *priv) |
31034792 | 56 | { |
05c644ea ML |
57 | struct usbtmc_scpi *uscpi = priv; |
58 | struct sr_usbtmc_dev_inst *usbtmc = uscpi->usbtmc; | |
31034792 ML |
59 | |
60 | if ((usbtmc->fd = open(usbtmc->device, O_RDWR)) < 0) | |
61 | return SR_ERR; | |
62 | ||
63 | return SR_OK; | |
64 | } | |
65 | ||
d87c1766 | 66 | static int scpi_usbtmc_source_add(void *priv, int events, int timeout, |
31034792 ML |
67 | sr_receive_data_callback_t cb, void *cb_data) |
68 | { | |
05c644ea ML |
69 | struct usbtmc_scpi *uscpi = priv; |
70 | struct sr_usbtmc_dev_inst *usbtmc = uscpi->usbtmc; | |
31034792 ML |
71 | |
72 | return sr_source_add(usbtmc->fd, events, timeout, cb, cb_data); | |
73 | } | |
74 | ||
d87c1766 | 75 | static int scpi_usbtmc_source_remove(void *priv) |
31034792 | 76 | { |
05c644ea ML |
77 | struct usbtmc_scpi *uscpi = priv; |
78 | struct sr_usbtmc_dev_inst *usbtmc = uscpi->usbtmc; | |
31034792 ML |
79 | |
80 | return sr_source_remove(usbtmc->fd); | |
81 | } | |
82 | ||
d87c1766 | 83 | static int scpi_usbtmc_send(void *priv, const char *command) |
31034792 | 84 | { |
05c644ea ML |
85 | struct usbtmc_scpi *uscpi = priv; |
86 | struct sr_usbtmc_dev_inst *usbtmc = uscpi->usbtmc; | |
31034792 ML |
87 | int len, out; |
88 | ||
89 | len = strlen(command); | |
90 | out = write(usbtmc->fd, command, len); | |
91 | ||
92 | if (out < 0) { | |
93 | sr_err("Write error: %s", strerror(errno)); | |
94 | return SR_ERR; | |
95 | } | |
96 | ||
97 | if (out < len) { | |
98 | sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out, | |
99 | len, command); | |
100 | } | |
101 | ||
102 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
103 | ||
104 | return SR_OK; | |
105 | } | |
106 | ||
d87c1766 | 107 | static int scpi_usbtmc_read_begin(void *priv) |
31034792 | 108 | { |
05c644ea ML |
109 | struct usbtmc_scpi *uscpi = priv; |
110 | struct sr_usbtmc_dev_inst *usbtmc = uscpi->usbtmc; | |
31034792 ML |
111 | int len; |
112 | ||
05c644ea | 113 | len = read(usbtmc->fd, uscpi->response_buffer, MAX_READ_LENGTH); |
31034792 ML |
114 | |
115 | if (len < 0) { | |
116 | sr_err("Read error: %s", strerror(errno)); | |
31034792 ML |
117 | return SR_ERR; |
118 | } | |
119 | ||
05c644ea ML |
120 | uscpi->response_length = len; |
121 | uscpi->response_bytes_read = 0; | |
31034792 | 122 | |
a849c43a ML |
123 | sr_spew("Read %d bytes from device into buffer", len); |
124 | ||
31034792 ML |
125 | return SR_OK; |
126 | } | |
127 | ||
d87c1766 | 128 | static int scpi_usbtmc_read_data(void *priv, char *buf, int maxlen) |
a1ff9c18 | 129 | { |
05c644ea ML |
130 | struct usbtmc_scpi *uscpi = priv; |
131 | int read_length; | |
a1ff9c18 | 132 | |
a849c43a | 133 | sr_spew("%d bytes requested", maxlen); |
8ae157d9 | 134 | |
a849c43a ML |
135 | if (uscpi->response_bytes_read == uscpi->response_length) { |
136 | sr_spew("Buffer is empty."); | |
137 | if (uscpi->response_length == MAX_READ_LENGTH) { | |
138 | sr_spew("Previous read was of maximum length, reading again."); | |
139 | if (scpi_usbtmc_read_begin(uscpi) != SR_OK) | |
140 | return SR_ERR; | |
141 | } else { | |
142 | return SR_ERR; | |
143 | } | |
144 | } | |
a1ff9c18 | 145 | |
05c644ea ML |
146 | read_length = uscpi->response_length - uscpi->response_bytes_read; |
147 | ||
148 | if (read_length > maxlen) | |
149 | read_length = maxlen; | |
150 | ||
151 | memcpy(buf, uscpi->response_buffer + uscpi->response_bytes_read, read_length); | |
152 | ||
153 | uscpi->response_bytes_read += read_length; | |
154 | ||
a849c43a ML |
155 | sr_spew("Returned %d bytes from buffer, %d/%d bytes of buffer now read", |
156 | read_length, uscpi->response_bytes_read, uscpi->response_length); | |
157 | ||
05c644ea ML |
158 | return read_length; |
159 | } | |
160 | ||
d87c1766 | 161 | static int scpi_usbtmc_read_complete(void *priv) |
05c644ea ML |
162 | { |
163 | struct usbtmc_scpi *uscpi = priv; | |
164 | ||
8ae157d9 AJ |
165 | if (uscpi->response_length == MAX_READ_LENGTH |
166 | && uscpi->response_bytes_read == uscpi->response_length) | |
167 | scpi_usbtmc_read_begin(uscpi); | |
168 | ||
05c644ea | 169 | return (uscpi->response_bytes_read >= uscpi->response_length); |
a1ff9c18 ML |
170 | } |
171 | ||
d87c1766 | 172 | static int scpi_usbtmc_close(void *priv) |
31034792 | 173 | { |
05c644ea | 174 | struct usbtmc_scpi *uscpi = priv; |
31034792 | 175 | |
f754c146 | 176 | if (close(uscpi->usbtmc->fd) < 0) |
31034792 ML |
177 | return SR_ERR; |
178 | ||
179 | return SR_OK; | |
180 | } | |
181 | ||
91e406b9 BV |
182 | static void scpi_usbtmc_free(void *priv) |
183 | { | |
05c644ea | 184 | struct usbtmc_scpi *uscpi = priv; |
05c644ea | 185 | |
f754c146 | 186 | sr_usbtmc_dev_inst_free(uscpi->usbtmc); |
91e406b9 BV |
187 | } |
188 | ||
f754c146 AJ |
189 | SR_PRIV const struct sr_scpi_dev_inst scpi_usbtmc_dev = { |
190 | .name = "USBTMC", | |
191 | .prefix = "/dev/usbtmc", | |
192 | .priv_size = sizeof(struct usbtmc_scpi), | |
193 | .dev_inst_new = scpi_usbtmc_dev_inst_new, | |
194 | .open = scpi_usbtmc_open, | |
195 | .source_add = scpi_usbtmc_source_add, | |
196 | .source_remove = scpi_usbtmc_source_remove, | |
197 | .send = scpi_usbtmc_send, | |
198 | .read_begin = scpi_usbtmc_read_begin, | |
199 | .read_data = scpi_usbtmc_read_data, | |
200 | .read_complete = scpi_usbtmc_read_complete, | |
201 | .close = scpi_usbtmc_close, | |
202 | .free = scpi_usbtmc_free, | |
203 | }; |