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-rw-r--r--toys/other/i2ctools.c314
1 files changed, 314 insertions, 0 deletions
diff --git a/toys/other/i2ctools.c b/toys/other/i2ctools.c
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--- /dev/null
+++ b/toys/other/i2ctools.c
@@ -0,0 +1,314 @@
+/* i2ctools.c - i2c tools
+ *
+ * Copyright 2018 The Android Open Source Project
+ *
+ * https://www.kernel.org/doc/Documentation/i2c/
+ *
+ * Note: -y must have the same value in each toy for `confirm`.
+ *
+ * TODO: i2cdetect -q/-r and the "auto" mode?
+ * TODO: i2cdump non-byte modes, -r FIRST-LAST?
+ * TODO: i2cget non-byte modes? default to current read address?
+ * TODO: i2cset -r? -m MASK? c/s modes, p mode modifier?
+
+USE_I2CDETECT(NEWTOY(i2cdetect, ">3aFly", TOYFLAG_USR|TOYFLAG_BIN))
+USE_I2CDUMP(NEWTOY(i2cdump, "<2>2fy", TOYFLAG_USR|TOYFLAG_BIN))
+USE_I2CGET(NEWTOY(i2cget, "<3>3fy", TOYFLAG_USR|TOYFLAG_BIN))
+USE_I2CSET(NEWTOY(i2cset, "<4fy", TOYFLAG_USR|TOYFLAG_BIN))
+
+config I2CDETECT
+ bool "i2cdetect"
+ default y
+ help
+ usage: i2cdetect [-ary] BUS [FIRST LAST]
+ usage: i2cdetect -F BUS
+ usage: i2cdetect -l
+
+ Detects i2c devices.
+
+ -a All addresses (0x00-0x7f rather than 0x03-0x77)
+ -F Show functionality
+ -l List all buses
+ -r Probe with SMBus Read Byte
+ -y Answer "yes" to confirmation prompts (for script use)
+
+config I2CDUMP
+ bool "i2cdump"
+ default y
+ help
+ usage: i2cdump [-fy] BUS CHIP
+
+ Dumps i2c registers.
+
+ -f Force access to busy devices
+ -y Answer "yes" to confirmation prompts (for script use)
+
+config I2CGET
+ bool "i2cget"
+ default y
+ help
+ usage: i2cget [-fy] BUS CHIP ADDR [MODE]
+
+ Reads an i2c register.
+
+ -f Force access to busy devices
+ -y Answer "yes" to confirmation prompts (for script use)
+
+config I2CSET
+ bool "i2cset"
+ default y
+ help
+ usage: i2cset [-fy] BUS CHIP ADDR VALUE... MODE
+
+ Writes an i2c register. MODE is b for byte, w for 16-bit word, i for I2C block.
+
+ -f Force access to busy devices
+ -y Answer "yes" to confirmation prompts (for script use)
+*/
+
+#define FOR_i2cdetect
+#include "toys.h"
+
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+
+printf_format static void confirm(const char *fmt, ...)
+{
+ va_list va;
+
+ if (toys.optflags & FLAG_y) return;
+
+ va_start(va, fmt);
+ vfprintf(stderr, fmt, va);
+ va_end(va);
+ if (!yesno(1)) error_exit("Exiting");
+}
+
+static int i2c_open(int bus, int slave, int chip)
+{
+ int fd;
+
+ snprintf(toybuf, sizeof(toybuf), "/dev/i2c-%d", bus);
+ fd = xopen(toybuf, O_RDONLY);
+ if (slave) xioctl(fd, slave, (void *)(long)chip);
+ return fd;
+}
+
+static unsigned long i2c_get_funcs(int bus)
+{
+ int fd = i2c_open(bus, 0, 0);
+ unsigned long result;
+
+ xioctl(fd, I2C_FUNCS, &result);
+ close(fd);
+ return result;
+}
+
+static int i2c_read_byte(int fd, int addr, int *byte)
+{
+ struct i2c_smbus_ioctl_data ioctl_data;
+ union i2c_smbus_data data;
+
+ memset(&data, 0, sizeof(data));
+ ioctl_data.read_write = I2C_SMBUS_READ;
+ ioctl_data.size = I2C_SMBUS_BYTE_DATA;
+ ioctl_data.command = addr;
+ ioctl_data.data = &data;
+ if (ioctl(fd, I2C_SMBUS, &ioctl_data) == -1) return -1;
+ *byte = data.byte;
+ return 0;
+}
+
+static void i2cdetect_dash_F(int bus)
+{
+ size_t i;
+
+ struct { int mask; const char *name; } funcs[] = {
+ {I2C_FUNC_I2C, "I2C"},
+ {I2C_FUNC_SMBUS_QUICK, "SMBus Quick Command"},
+ {I2C_FUNC_SMBUS_WRITE_BYTE, "SMBus Send Byte"},
+ {I2C_FUNC_SMBUS_READ_BYTE, "SMBus Receive Byte"},
+ {I2C_FUNC_SMBUS_WRITE_BYTE_DATA, "SMBus Write Byte"},
+ {I2C_FUNC_SMBUS_READ_BYTE_DATA, "SMBus Read Byte"},
+ {I2C_FUNC_SMBUS_WRITE_WORD_DATA, "SMBus Write Word"},
+ {I2C_FUNC_SMBUS_READ_WORD_DATA, "SMBus Read Word"},
+ {I2C_FUNC_SMBUS_PROC_CALL, "SMBus Process Call"},
+ {I2C_FUNC_SMBUS_WRITE_BLOCK_DATA, "SMBus Write Block"},
+ {I2C_FUNC_SMBUS_READ_BLOCK_DATA, "SMBus Read Block"},
+ {I2C_FUNC_SMBUS_BLOCK_PROC_CALL, "SMBus Block Process Call"},
+ {I2C_FUNC_SMBUS_PEC, "SMBus PEC"},
+ {I2C_FUNC_SMBUS_WRITE_I2C_BLOCK, "I2C Write Block"},
+ {I2C_FUNC_SMBUS_READ_I2C_BLOCK, "I2C Read Block"},
+ };
+ unsigned long supported = i2c_get_funcs(bus);
+
+ printf("Functionalities implemented by %s:\n", toybuf);
+ for (i = 0; i < ARRAY_LEN(funcs); ++i) {
+ printf("%-32s %s\n", funcs[i].name,
+ (supported & funcs[i].mask) ? "yes" : "no");
+ }
+}
+
+static int i2cdetect_dash_l(struct dirtree *node)
+{
+ int suffix_len = strlen("/name");
+ int bus;
+ char *fname, *p;
+ unsigned long funcs;
+
+ if (!node->parent) return DIRTREE_RECURSE; // Skip the directory itself.
+
+ if (sscanf(node->name, "i2c-%d", &bus) != 1) return 0;
+ funcs = i2c_get_funcs(bus);
+
+ fname = dirtree_path(node, &suffix_len);
+ strcat(fname, "/name");
+ xreadfile(fname, toybuf, sizeof(toybuf));
+ free(fname);
+ if ((p = strchr(toybuf, '\n'))) *p = 0;
+
+ // "i2c-1 i2c Synopsys DesignWare I2C adapter I2C adapter"
+ printf("%s\t%-10s\t%-32s\t%s\n", node->name,
+ (funcs & I2C_FUNC_I2C) ? "i2c" : "?",
+ toybuf,
+ (funcs & I2C_FUNC_I2C) ? "I2C Adapter" : "?");
+
+ return 0;
+}
+
+void i2cdetect_main(void)
+{
+ if (toys.optflags & FLAG_l) {
+ if (toys.optc) error_exit("-l doesn't take arguments");
+ dirtree_read("/sys/class/i2c-dev", i2cdetect_dash_l);
+ } else if (toys.optflags & FLAG_F) {
+ if (toys.optc != 1) error_exit("-F BUS");
+ i2cdetect_dash_F(atolx_range(*toys.optargs, 0, INT_MAX));
+ } else {
+ int bus, first = 0x03, last = 0x77, fd, row, addr, byte;
+
+ if (toys.optflags & FLAG_a) {
+ first = 0x00;
+ last = 0x7f;
+ }
+
+ if (toys.optc != 1 && toys.optc != 3) error_exit("bad args");
+ bus = atolx_range(*toys.optargs, 0, INT_MAX);
+ if (toys.optc == 3) {
+ first = atolx_range(toys.optargs[1], 0, 0x7f);
+ last = atolx_range(toys.optargs[1], 0, 0x7f);
+ if (first > last) error_exit("first > last");
+ }
+
+ confirm("Probe chips 0x%02x-0x%02x on bus %d?", first, last, bus);
+
+ fd = i2c_open(bus, 0, 0);
+ printf(" 0 1 2 3 4 5 6 7 8 9 a b c d e f\n");
+ for (row = 0; row <= 0x70; row += 16) {
+ xprintf("%02x:", row & 0xf0);
+ for (addr = row; addr < row + 16; ++addr) {
+ if (addr < first || addr > last) printf(" ");
+ else {
+ if (ioctl(fd, I2C_SLAVE, addr) == -1) {
+ if (errno == EBUSY) {
+ xprintf(" UU");
+ continue;
+ }
+ perror_exit("ioctl(I2C_SLAVE)");
+ }
+ if (i2c_read_byte(fd, addr, &byte) == -1) xprintf(" --");
+ else xprintf(" %02x", addr);
+ }
+ }
+ putchar('\n');
+ }
+ close(fd);
+ }
+}
+
+#define CLEANUP_i2cdetect
+#define FOR_i2cdump
+#include "generated/flags.h"
+
+void i2cdump_main(void)
+{
+ int bus = atolx_range(toys.optargs[0], 0, INT_MAX);
+ int chip = atolx_range(toys.optargs[1], 0, 0x7f);
+ int fd, row, addr, byte;
+
+ confirm("Dump chip 0x%02x on bus %d?", chip, bus);
+
+ fd = i2c_open(bus, (toys.optflags&FLAG_f)?I2C_SLAVE_FORCE:I2C_SLAVE, chip);
+ printf(" 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef\n");
+ for (row = 0; row <= 0xf0; row += 16) {
+ xprintf("%02x:", row & 0xf0);
+ for (addr = row; addr < row + 16; ++addr) {
+ if (i2c_read_byte(fd, addr, &byte) == -1) perror_exit("i2c_read_byte");
+ printf(" %02x", byte);
+ toybuf[addr-row] = isprint(byte) ? byte : (byte ? '?' : '.');
+ }
+ printf(" %16.16s\n", toybuf);
+ }
+ close(fd);
+}
+
+#define CLEANUP_i2cdump
+#define FOR_i2cget
+#include "generated/flags.h"
+
+void i2cget_main(void)
+{
+ int bus = atolx_range(toys.optargs[0], 0, INT_MAX);
+ int chip = atolx_range(toys.optargs[1], 0, 0x7f);
+ int addr = atolx_range(toys.optargs[2], 0, 0xff);
+ int fd, byte;
+
+ confirm("Read register 0x%02x from chip 0x%02x on bus %d?", addr, chip, bus);
+
+ fd = i2c_open(bus, (toys.optflags&FLAG_f)?I2C_SLAVE_FORCE:I2C_SLAVE, chip);
+ if (i2c_read_byte(fd, addr, &byte) == -1) perror_exit("i2c_read_byte");
+ printf("0x%02x\n", byte);
+ close(fd);
+}
+
+#define CLEANUP_i2cget
+#define FOR_i2cset
+#include "generated/flags.h"
+
+void i2cset_main(void)
+{
+ int bus = atolx_range(toys.optargs[0], 0, INT_MAX);
+ int chip = atolx_range(toys.optargs[1], 0, 0x7f);
+ int addr = atolx_range(toys.optargs[2], 0, 0xff);
+ char *mode = toys.optargs[toys.optc-1];
+ int fd, i;
+ struct i2c_smbus_ioctl_data ioctl_data;
+ union i2c_smbus_data data;
+
+ memset(&data, 0, sizeof(data));
+ if (strlen(mode) != 1) help_exit("mode too long");
+ if (*mode == 'b' && toys.optc == 5) {
+ ioctl_data.size = I2C_SMBUS_BYTE_DATA;
+ data.byte = atolx_range(toys.optargs[3], 0, 0xff);
+ } else if (*mode == 'w' && toys.optc == 5) {
+ ioctl_data.size = I2C_SMBUS_WORD_DATA;
+ data.word = atolx_range(toys.optargs[3], 0, 0xffff);
+ } else if (*mode == 'i' && toys.optc >= 5) {
+ if (toys.optc - 4 > I2C_SMBUS_BLOCK_MAX) error_exit("too much data");
+ ioctl_data.size = I2C_SMBUS_I2C_BLOCK_DATA;
+ for (i = 0; i < toys.optc - 4; ++i)
+ data.block[i+1] = atolx_range(toys.optargs[3+i], 0, 0xff);
+ data.block[0] = toys.optc - 4;
+ } else {
+ help_exit("syntax error");
+ }
+
+ confirm("Write register 0x%02x from chip 0x%02x on bus %d?", addr, chip, bus);
+
+ fd = i2c_open(bus, (toys.optflags&FLAG_f)?I2C_SLAVE_FORCE:I2C_SLAVE, chip);
+ ioctl_data.read_write = I2C_SMBUS_WRITE;
+ ioctl_data.command = addr;
+ ioctl_data.data = &data;
+ xioctl(fd, I2C_SMBUS, &ioctl_data);
+ close(fd);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 05:47:23 +0000