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1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
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 2 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, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
19  */
20
21 #include <config.h>
22 #include <glib.h>
23 #include <libsigrok/libsigrok.h>
24 #include "libsigrok-internal.h"
25 #include "protocol.h"
26
27 static const uint32_t scanopts[] = {
28         SR_CONF_CONN,
29         SR_CONF_SERIALCOMM,
30 };
31
32 static const uint32_t devopts[] = {
33         SR_CONF_SCALE,
34         SR_CONF_CONTINUOUS,
35         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
36         SR_CONF_LIMIT_MSEC | SR_CONF_SET,
37 };
38
39 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
40 {
41         return std_init(di, sr_ctx);
42 }
43
44 static GSList *scan(struct sr_dev_driver *di, GSList *options)
45 {
46         struct scale_info *scale;
47         struct sr_config *src;
48         GSList *l, *devices;
49         const char *conn, *serialcomm;
50         struct sr_dev_inst *sdi;
51         struct drv_context *drvc;
52         struct dev_context *devc;
53         struct sr_serial_dev_inst *serial;
54         int ret;
55         size_t len;
56         uint8_t buf[128];
57
58         scale = (struct scale_info *)di;
59
60         conn = serialcomm = NULL;
61         for (l = options; l; l = l->next) {
62                 src = l->data;
63                 switch (src->key) {
64                 case SR_CONF_CONN:
65                         conn = g_variant_get_string(src->data, NULL);
66                         break;
67                 case SR_CONF_SERIALCOMM:
68                         serialcomm = g_variant_get_string(src->data, NULL);
69                         break;
70                 }
71         }
72         if (!conn)
73                 return NULL;
74
75         if (!serialcomm)
76                 serialcomm = scale->conn;
77
78         serial = sr_serial_dev_inst_new(conn, serialcomm);
79
80         if (serial_open(serial, SERIAL_RDWR) != SR_OK)
81                 return NULL;
82
83         sr_info("Probing serial port %s.", conn);
84
85         drvc = di->context;
86         devices = NULL;
87         serial_flush(serial);
88
89         sr_spew("Set O1 mode (continuous values, stable and unstable ones).");
90         if (serial_write_nonblocking(serial, "O1\r\n", 4) != 4)
91                 goto scan_cleanup;
92         /* Device replies with "A00\r\n" (OK) or "E01\r\n" (Error). Ignore. */
93
94         /* Let's get a bit of data and see if we can find a packet. */
95         len = sizeof(buf);
96         ret = serial_stream_detect(serial, buf, &len, scale->packet_size,
97                                    scale->packet_valid, 3000, scale->baudrate);
98         if (ret != SR_OK)
99                 goto scan_cleanup;
100
101         sr_info("Found device on port %s.", conn);
102
103         sdi = g_malloc0(sizeof(struct sr_dev_inst));
104         sdi->status = SR_ST_INACTIVE;
105         sdi->vendor = g_strdup(scale->vendor);
106         sdi->model = g_strdup(scale->device);
107         devc = g_malloc0(sizeof(struct dev_context));
108         sr_sw_limits_init(&devc->limits);
109         sdi->inst_type = SR_INST_SERIAL;
110         sdi->conn = serial;
111         sdi->priv = devc;
112         sdi->driver = di;
113         sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "Mass");
114         drvc->instances = g_slist_append(drvc->instances, sdi);
115         devices = g_slist_append(devices, sdi);
116
117 scan_cleanup:
118         serial_close(serial);
119
120         return devices;
121 }
122
123 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
124                 const struct sr_channel_group *cg)
125 {
126         struct dev_context *devc;
127
128         (void)cg;
129
130         if (sdi->status != SR_ST_ACTIVE)
131                 return SR_ERR_DEV_CLOSED;
132
133         if (!(devc = sdi->priv))
134                 return SR_ERR_BUG;
135
136         return sr_sw_limits_config_set(&devc->limits, key, data);
137 }
138
139 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
140                 const struct sr_channel_group *cg)
141 {
142         (void)sdi;
143         (void)cg;
144
145         switch (key) {
146         case SR_CONF_SCAN_OPTIONS:
147                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
148                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
149                 break;
150         case SR_CONF_DEVICE_OPTIONS:
151                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
152                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
153                 break;
154         default:
155                 return SR_ERR_NA;
156         }
157
158         return SR_OK;
159 }
160
161 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
162 {
163         struct dev_context *devc;
164         struct sr_serial_dev_inst *serial;
165
166         if (sdi->status != SR_ST_ACTIVE)
167                 return SR_ERR_DEV_CLOSED;
168
169         devc = sdi->priv;
170         serial = sdi->conn;
171
172         sr_spew("Set O1 mode (continuous values, stable and unstable ones).");
173         if (serial_write_nonblocking(serial, "O1\r\n", 4) != 4)
174                 return SR_ERR;
175         /* Device replies with "A00\r\n" (OK) or "E01\r\n" (Error). Ignore. */
176
177         sr_sw_limits_acquisition_start(&devc->limits);
178         std_session_send_df_header(sdi, LOG_PREFIX);
179
180         /* Poll every 50ms, or whenever some data comes in. */
181         serial_source_add(sdi->session, serial, G_IO_IN, 50,
182                       kern_scale_receive_data, (void *)sdi);
183
184         return SR_OK;
185 }
186
187 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
188 {
189         return std_serial_dev_acquisition_stop(sdi, std_serial_dev_close,
190                         sdi->conn, LOG_PREFIX);
191 }
192
193 #define SCALE(ID, CHIPSET, VENDOR, MODEL, CONN, BAUDRATE, PACKETSIZE, \
194                         VALID, PARSE) \
195         &(struct scale_info) { \
196                 { \
197                         .name = ID, \
198                         .longname = VENDOR " " MODEL, \
199                         .api_version = 1, \
200                         .init = init, \
201                         .cleanup = std_cleanup, \
202                         .scan = scan, \
203                         .dev_list = std_dev_list, \
204                         .config_get = NULL, \
205                         .config_set = config_set, \
206                         .config_list = config_list, \
207                         .dev_open = std_serial_dev_open, \
208                         .dev_close = std_serial_dev_close, \
209                         .dev_acquisition_start = dev_acquisition_start, \
210                         .dev_acquisition_stop = dev_acquisition_stop, \
211                         .context = NULL, \
212                 }, \
213                 VENDOR, MODEL, CONN, BAUDRATE, PACKETSIZE, \
214                 VALID, PARSE, sizeof(struct CHIPSET##_info) \
215         }
216
217 /*
218  * Some scales have (user-configurable) 14-byte or 15-byte packets.
219  * We transparently support both variants by specifying the larger value
220  * below and due to the way the stream parser works.
221  *
222  * The scales have a standard baudrate (model dependent) as listed below,
223  * but serial parameters are user-configurable. We support that by letting
224  * the user override them via "serialcomm".
225  */
226
227 SR_PRIV const struct scale_info *kern_scale_drivers[] = {
228         SCALE(
229                 "kern-ew-6200-2nm", kern,
230                 "KERN", "EW 6200-2NM", "1200/8n2", 1200,
231                 15 /* (or 14) */, sr_kern_packet_valid, sr_kern_parse
232         ),
233         NULL
234 };