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scpi_serial: Get rid of intermediate buffer, do not strip newline
[libsigrok.git] / src / scpi / scpi_serial.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
5  * Copyright (C) 2013 Martin Ling <martin-sigrok@earth.li>
6  *
7  * This program is free software: you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation, either version 3 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
19  */
20
21 #include <config.h>
22 #include <glib.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <libsigrok/libsigrok.h>
26 #include "libsigrok-internal.h"
27 #include "scpi.h"
28
29 #define LOG_PREFIX "scpi_serial"
30
31 struct scpi_serial {
32         struct sr_serial_dev_inst *serial;
33         char got_newline;
34 };
35
36 static const struct {
37         uint16_t vendor_id;
38         uint16_t product_id;
39         const char *serialcomm;
40 } scpi_serial_usb_ids[] = {
41         { 0x0403, 0xed72, "115200/8n1/flow=1" }, /* Hameg HO720 */
42         { 0x0403, 0xed73, "115200/8n1/flow=1" }, /* Hameg HO730 */
43         { 0x0aad, 0x0118, "115200/8n1" },        /* R&S HMO1002 */
44 };
45
46 static GSList *scpi_serial_scan(struct drv_context *drvc)
47 {
48         GSList *l, *r, *resources = NULL;
49         gchar *res;
50         unsigned i;
51
52         (void)drvc;
53
54         for (i = 0; i < ARRAY_SIZE(scpi_serial_usb_ids); i++) {
55                 if (!(l = sr_serial_find_usb(scpi_serial_usb_ids[i].vendor_id,
56                                         scpi_serial_usb_ids[i].product_id)))
57                         continue;
58                 for (r = l; r; r = r->next) {
59                         if (scpi_serial_usb_ids[i].serialcomm)
60                                 res = g_strdup_printf("%s:%s", (char *) r->data,
61                                                       scpi_serial_usb_ids[i].serialcomm);
62                         else
63                                 res = g_strdup(r->data);
64                         resources = g_slist_append(resources, res);
65                 }
66                 g_slist_free_full(l, g_free);
67         }
68
69         return resources;
70 }
71
72 static int scpi_serial_dev_inst_new(void *priv, struct drv_context *drvc,
73                 const char *resource, char **params, const char *serialcomm)
74 {
75         struct scpi_serial *sscpi = priv;
76
77         (void)drvc;
78         (void)params;
79
80         sscpi->serial = sr_serial_dev_inst_new(resource, serialcomm);
81
82         return SR_OK;
83 }
84
85 static int scpi_serial_open(struct sr_scpi_dev_inst *scpi)
86 {
87         struct scpi_serial *sscpi = scpi->priv;
88         struct sr_serial_dev_inst *serial = sscpi->serial;
89
90         if (serial_open(serial, SERIAL_RDWR) != SR_OK)
91                 return SR_ERR;
92
93         if (serial_flush(serial) != SR_OK)
94                 return SR_ERR;
95
96         sscpi->got_newline = 0;
97
98         return SR_OK;
99 }
100
101 static int scpi_serial_source_add(struct sr_session *session, void *priv,
102                 int events, int timeout, sr_receive_data_callback cb, void *cb_data)
103 {
104         struct scpi_serial *sscpi = priv;
105         struct sr_serial_dev_inst *serial = sscpi->serial;
106
107         return serial_source_add(session, serial, events, timeout, cb, cb_data);
108 }
109
110 static int scpi_serial_source_remove(struct sr_session *session, void *priv)
111 {
112         struct scpi_serial *sscpi = priv;
113         struct sr_serial_dev_inst *serial = sscpi->serial;
114
115         return serial_source_remove(session, serial);
116 }
117
118 static int scpi_serial_send(void *priv, const char *command)
119 {
120         int len, result, written;
121         struct scpi_serial *sscpi = priv;
122         struct sr_serial_dev_inst *serial = sscpi->serial;
123
124         len = strlen(command);
125         written = 0;
126         while (written < len) {
127                 result = serial_write_nonblocking(serial,
128                                 command + written, len - written);
129                 if (result < 0) {
130                         sr_err("Error while sending SCPI command: '%s'.", command);
131                         return SR_ERR;
132                 }
133                 written += result;
134         }
135
136         sr_spew("Successfully sent SCPI command: '%s'.", command);
137
138         return SR_OK;
139 }
140
141 static int scpi_serial_read_begin(void *priv)
142 {
143         struct scpi_serial *sscpi = priv;
144         sscpi->got_newline = 0;
145
146         return SR_OK;
147 }
148
149 static int scpi_serial_read_data(void *priv, char *buf, int maxlen)
150 {
151         struct scpi_serial *sscpi = priv;
152         int ret;
153
154         /* Try to read new data into the buffer. */
155         ret = serial_read_nonblocking(sscpi->serial, buf, maxlen);
156
157         if (ret < 0)
158                 return ret;
159
160         if (ret > 0) {
161                 sr_spew("Read %d bytes into buffer.", ret);
162
163                 if (buf[ret - 1] == '\n') {
164                         sscpi->got_newline = 1;
165                         sr_spew("Received terminator");
166                 } else {
167                         sscpi->got_newline = 0;
168                 }
169         }
170
171         return ret;
172 }
173
174 static int scpi_serial_read_complete(void *priv)
175 {
176         struct scpi_serial *sscpi = priv;
177
178         return sscpi->got_newline;
179 }
180
181 static int scpi_serial_close(struct sr_scpi_dev_inst *scpi)
182 {
183         struct scpi_serial *sscpi = scpi->priv;
184
185         return serial_close(sscpi->serial);
186 }
187
188 static void scpi_serial_free(void *priv)
189 {
190         struct scpi_serial *sscpi = priv;
191
192         sr_serial_dev_inst_free(sscpi->serial);
193 }
194
195 SR_PRIV const struct sr_scpi_dev_inst scpi_serial_dev = {
196         .name          = "serial",
197         .prefix        = "",
198         .priv_size     = sizeof(struct scpi_serial),
199         .scan          = scpi_serial_scan,
200         .dev_inst_new  = scpi_serial_dev_inst_new,
201         .open          = scpi_serial_open,
202         .source_add    = scpi_serial_source_add,
203         .source_remove = scpi_serial_source_remove,
204         .send          = scpi_serial_send,
205         .read_begin    = scpi_serial_read_begin,
206         .read_data     = scpi_serial_read_data,
207         .read_complete = scpi_serial_read_complete,
208         .close         = scpi_serial_close,
209         .free          = scpi_serial_free,
210 };