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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 | ||
29 | /* Message logging helpers with subsystem-specific prefix string. */ | |
30 | #define LOG_PREFIX "scpi_usbtmc: " | |
31 | #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args) | |
32 | #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args) | |
33 | #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args) | |
34 | #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args) | |
35 | #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args) | |
36 | ||
37 | SR_PRIV int scpi_usbtmc_open(void *priv) | |
38 | { | |
39 | struct sr_usbtmc_dev_inst *usbtmc = priv; | |
40 | ||
41 | if ((usbtmc->fd = open(usbtmc->device, O_RDWR)) < 0) | |
42 | return SR_ERR; | |
43 | ||
44 | return SR_OK; | |
45 | } | |
46 | ||
47 | SR_PRIV int scpi_usbtmc_source_add(void *priv, int events, int timeout, | |
48 | sr_receive_data_callback_t cb, void *cb_data) | |
49 | { | |
50 | struct sr_usbtmc_dev_inst *usbtmc = priv; | |
51 | ||
52 | return sr_source_add(usbtmc->fd, events, timeout, cb, cb_data); | |
53 | } | |
54 | ||
55 | SR_PRIV int scpi_usbtmc_source_remove(void *priv) | |
56 | { | |
57 | struct sr_usbtmc_dev_inst *usbtmc = priv; | |
58 | ||
59 | return sr_source_remove(usbtmc->fd); | |
60 | } | |
61 | ||
62 | SR_PRIV int scpi_usbtmc_send(void *priv, const char *command) | |
63 | { | |
64 | struct sr_usbtmc_dev_inst *usbtmc = priv; | |
65 | int len, out; | |
66 | ||
67 | len = strlen(command); | |
68 | out = write(usbtmc->fd, command, len); | |
69 | ||
70 | if (out < 0) { | |
71 | sr_err("Write error: %s", strerror(errno)); | |
72 | return SR_ERR; | |
73 | } | |
74 | ||
75 | if (out < len) { | |
76 | sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out, | |
77 | len, command); | |
78 | } | |
79 | ||
80 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
81 | ||
82 | return SR_OK; | |
83 | } | |
84 | ||
85 | SR_PRIV int scpi_usbtmc_receive(void *priv, char **scpi_response) | |
86 | { | |
87 | struct sr_usbtmc_dev_inst *usbtmc = priv; | |
88 | GString *response; | |
89 | char buf[256]; | |
90 | int len; | |
91 | ||
92 | response = g_string_sized_new(1024); | |
93 | ||
94 | len = read(usbtmc->fd, buf, sizeof(buf)); | |
95 | ||
96 | if (len < 0) { | |
97 | sr_err("Read error: %s", strerror(errno)); | |
98 | g_string_free(response, TRUE); | |
99 | return SR_ERR; | |
100 | } | |
101 | ||
102 | response = g_string_append_len(response, buf, len); | |
103 | ||
104 | *scpi_response = response->str; | |
105 | ||
106 | sr_dbg("SCPI response received (length %d): '%.50s'", | |
107 | response->len, response->str); | |
108 | ||
109 | g_string_free(response, FALSE); | |
110 | ||
111 | return SR_OK; | |
112 | } | |
113 | ||
114 | SR_PRIV int scpi_usbtmc_close(void *priv) | |
115 | { | |
116 | struct sr_usbtmc_dev_inst *usbtmc = priv; | |
117 | ||
118 | if (close(usbtmc->fd) < 0) | |
119 | return SR_ERR; | |
120 | ||
121 | return SR_OK; | |
122 | } | |
123 | ||
124 | SR_PRIV struct sr_scpi_dev_inst *scpi_usbtmc_dev_inst_new(const char *device) | |
125 | { | |
126 | struct sr_scpi_dev_inst *scpi; | |
127 | struct sr_usbtmc_dev_inst *usbtmc; | |
128 | ||
129 | scpi = g_try_malloc(sizeof(struct sr_scpi_dev_inst)); | |
130 | ||
131 | if (!(usbtmc = sr_usbtmc_dev_inst_new(device))) | |
132 | { | |
133 | g_free(scpi); | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | scpi->open = scpi_usbtmc_open; | |
138 | scpi->source_add = scpi_usbtmc_source_add; | |
139 | scpi->source_remove = scpi_usbtmc_source_remove; | |
140 | scpi->send = scpi_usbtmc_send; | |
141 | scpi->receive = scpi_usbtmc_receive; | |
142 | scpi->close = scpi_usbtmc_close; | |
143 | scpi->free = sr_usbtmc_dev_inst_free; | |
144 | scpi->priv = usbtmc; | |
145 | ||
146 | return scpi; | |
147 | } |