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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | #include <stdio.h> | |
3 | #include <unistd.h> | |
4 | #include <stdlib.h> | |
5 | #include <fcntl.h> | |
6 | #include <string.h> | |
7 | ||
8 | #include <sys/ioctl.h> | |
9 | #include <sys/types.h> | |
10 | #include <sys/stat.h> | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/spi/spidev.h> | |
14 | ||
15 | ||
16 | static int verbose; | |
17 | ||
18 | static void do_read(int fd, int len) | |
19 | { | |
20 | unsigned char buf[32], *bp; | |
21 | int status; | |
22 | ||
23 | /* read at least 2 bytes, no more than 32 */ | |
24 | if (len < 2) | |
25 | len = 2; | |
26 | else if (len > sizeof(buf)) | |
27 | len = sizeof(buf); | |
28 | memset(buf, 0, sizeof buf); | |
29 | ||
30 | status = read(fd, buf, len); | |
31 | if (status < 0) { | |
32 | perror("read"); | |
33 | return; | |
34 | } | |
35 | if (status != len) { | |
36 | fprintf(stderr, "short read\n"); | |
37 | return; | |
38 | } | |
39 | ||
40 | printf("read(%2d, %2d): %02x %02x,", len, status, | |
41 | buf[0], buf[1]); | |
42 | status -= 2; | |
43 | bp = buf + 2; | |
44 | while (status-- > 0) | |
45 | printf(" %02x", *bp++); | |
46 | printf("\n"); | |
47 | } | |
48 | ||
49 | static void do_msg(int fd, int len) | |
50 | { | |
51 | struct spi_ioc_transfer xfer[2]; | |
52 | unsigned char buf[32], *bp; | |
53 | int status; | |
54 | ||
55 | memset(xfer, 0, sizeof xfer); | |
56 | memset(buf, 0, sizeof buf); | |
57 | ||
58 | if (len > sizeof buf) | |
59 | len = sizeof buf; | |
60 | ||
61 | buf[0] = 0xaa; | |
62 | xfer[0].tx_buf = (unsigned long)buf; | |
63 | xfer[0].len = 1; | |
64 | ||
65 | xfer[1].rx_buf = (unsigned long) buf; | |
66 | xfer[1].len = len; | |
67 | ||
68 | status = ioctl(fd, SPI_IOC_MESSAGE(2), xfer); | |
69 | if (status < 0) { | |
70 | perror("SPI_IOC_MESSAGE"); | |
71 | return; | |
72 | } | |
73 | ||
74 | printf("response(%2d, %2d): ", len, status); | |
75 | for (bp = buf; len; len--) | |
76 | printf(" %02x", *bp++); | |
77 | printf("\n"); | |
78 | } | |
79 | ||
80 | static void dumpstat(const char *name, int fd) | |
81 | { | |
82 | __u8 lsb, bits; | |
83 | __u32 mode, speed; | |
84 | ||
85 | if (ioctl(fd, SPI_IOC_RD_MODE32, &mode) < 0) { | |
86 | perror("SPI rd_mode"); | |
87 | return; | |
88 | } | |
89 | if (ioctl(fd, SPI_IOC_RD_LSB_FIRST, &lsb) < 0) { | |
90 | perror("SPI rd_lsb_fist"); | |
91 | return; | |
92 | } | |
93 | if (ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0) { | |
94 | perror("SPI bits_per_word"); | |
95 | return; | |
96 | } | |
97 | if (ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed) < 0) { | |
98 | perror("SPI max_speed_hz"); | |
99 | return; | |
100 | } | |
101 | ||
102 | printf("%s: spi mode 0x%x, %d bits %sper word, %d Hz max\n", | |
103 | name, mode, bits, lsb ? "(lsb first) " : "", speed); | |
104 | } | |
105 | ||
106 | int main(int argc, char **argv) | |
107 | { | |
108 | int c; | |
109 | int readcount = 0; | |
110 | int msglen = 0; | |
111 | int fd; | |
112 | const char *name; | |
113 | ||
114 | while ((c = getopt(argc, argv, "hm:r:v")) != EOF) { | |
115 | switch (c) { | |
116 | case 'm': | |
117 | msglen = atoi(optarg); | |
118 | if (msglen < 0) | |
119 | goto usage; | |
120 | continue; | |
121 | case 'r': | |
122 | readcount = atoi(optarg); | |
123 | if (readcount < 0) | |
124 | goto usage; | |
125 | continue; | |
126 | case 'v': | |
127 | verbose++; | |
128 | continue; | |
129 | case 'h': | |
130 | case '?': | |
131 | usage: | |
132 | fprintf(stderr, | |
133 | "usage: %s [-h] [-m N] [-r N] /dev/spidevB.D\n", | |
134 | argv[0]); | |
135 | return 1; | |
136 | } | |
137 | } | |
138 | ||
139 | if ((optind + 1) != argc) | |
140 | goto usage; | |
141 | name = argv[optind]; | |
142 | ||
143 | fd = open(name, O_RDWR); | |
144 | if (fd < 0) { | |
145 | perror("open"); | |
146 | return 1; | |
147 | } | |
148 | ||
149 | dumpstat(name, fd); | |
150 | ||
151 | if (msglen) | |
152 | do_msg(fd, msglen); | |
153 | ||
154 | if (readcount) | |
155 | do_read(fd, readcount); | |
156 | ||
157 | close(fd); | |
158 | return 0; | |
159 | } |