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documentation: move spidev_fdx example to its own source file
Move sample source code to its own source file so that it can be used easier and build-tested/check/maintained by anyone. (Makefile changes are in a separate patch for all of Documentation/.) Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Randy Dunlap
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Linus Torvalds
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Apr 28, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| #include <stdio.h> | ||
| #include <unistd.h> | ||
| #include <stdlib.h> | ||
| #include <fcntl.h> | ||
| #include <string.h> | ||
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| #include <sys/ioctl.h> | ||
| #include <sys/types.h> | ||
| #include <sys/stat.h> | ||
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| #include <linux/types.h> | ||
| #include <linux/spi/spidev.h> | ||
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| static int verbose; | ||
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| static void do_read(int fd, int len) | ||
| { | ||
| unsigned char buf[32], *bp; | ||
| int status; | ||
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| /* read at least 2 bytes, no more than 32 */ | ||
| if (len < 2) | ||
| len = 2; | ||
| else if (len > sizeof(buf)) | ||
| len = sizeof(buf); | ||
| memset(buf, 0, sizeof buf); | ||
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| status = read(fd, buf, len); | ||
| if (status < 0) { | ||
| perror("read"); | ||
| return; | ||
| } | ||
| if (status != len) { | ||
| fprintf(stderr, "short read\n"); | ||
| return; | ||
| } | ||
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| printf("read(%2d, %2d): %02x %02x,", len, status, | ||
| buf[0], buf[1]); | ||
| status -= 2; | ||
| bp = buf + 2; | ||
| while (status-- > 0) | ||
| printf(" %02x", *bp++); | ||
| printf("\n"); | ||
| } | ||
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| static void do_msg(int fd, int len) | ||
| { | ||
| struct spi_ioc_transfer xfer[2]; | ||
| unsigned char buf[32], *bp; | ||
| int status; | ||
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| memset(xfer, 0, sizeof xfer); | ||
| memset(buf, 0, sizeof buf); | ||
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| if (len > sizeof buf) | ||
| len = sizeof buf; | ||
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| buf[0] = 0xaa; | ||
| xfer[0].tx_buf = (__u64) buf; | ||
| xfer[0].len = 1; | ||
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| xfer[1].rx_buf = (__u64) buf; | ||
| xfer[1].len = len; | ||
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| status = ioctl(fd, SPI_IOC_MESSAGE(2), xfer); | ||
| if (status < 0) { | ||
| perror("SPI_IOC_MESSAGE"); | ||
| return; | ||
| } | ||
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| printf("response(%2d, %2d): ", len, status); | ||
| for (bp = buf; len; len--) | ||
| printf(" %02x", *bp++); | ||
| printf("\n"); | ||
| } | ||
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| static void dumpstat(const char *name, int fd) | ||
| { | ||
| __u8 mode, lsb, bits; | ||
| __u32 speed; | ||
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| if (ioctl(fd, SPI_IOC_RD_MODE, &mode) < 0) { | ||
| perror("SPI rd_mode"); | ||
| return; | ||
| } | ||
| if (ioctl(fd, SPI_IOC_RD_LSB_FIRST, &lsb) < 0) { | ||
| perror("SPI rd_lsb_fist"); | ||
| return; | ||
| } | ||
| if (ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0) { | ||
| perror("SPI bits_per_word"); | ||
| return; | ||
| } | ||
| if (ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed) < 0) { | ||
| perror("SPI max_speed_hz"); | ||
| return; | ||
| } | ||
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| printf("%s: spi mode %d, %d bits %sper word, %d Hz max\n", | ||
| name, mode, bits, lsb ? "(lsb first) " : "", speed); | ||
| } | ||
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| int main(int argc, char **argv) | ||
| { | ||
| int c; | ||
| int readcount = 0; | ||
| int msglen = 0; | ||
| int fd; | ||
| const char *name; | ||
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| while ((c = getopt(argc, argv, "hm:r:v")) != EOF) { | ||
| switch (c) { | ||
| case 'm': | ||
| msglen = atoi(optarg); | ||
| if (msglen < 0) | ||
| goto usage; | ||
| continue; | ||
| case 'r': | ||
| readcount = atoi(optarg); | ||
| if (readcount < 0) | ||
| goto usage; | ||
| continue; | ||
| case 'v': | ||
| verbose++; | ||
| continue; | ||
| case 'h': | ||
| case '?': | ||
| usage: | ||
| fprintf(stderr, | ||
| "usage: %s [-h] [-m N] [-r N] /dev/spidevB.D\n", | ||
| argv[0]); | ||
| return 1; | ||
| } | ||
| } | ||
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| if ((optind + 1) != argc) | ||
| goto usage; | ||
| name = argv[optind]; | ||
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| fd = open(name, O_RDWR); | ||
| if (fd < 0) { | ||
| perror("open"); | ||
| return 1; | ||
| } | ||
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| dumpstat(name, fd); | ||
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| if (msglen) | ||
| do_msg(fd, msglen); | ||
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| if (readcount) | ||
| do_read(fd, readcount); | ||
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| close(fd); | ||
| return 0; | ||
| } |