/* 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
Detect 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
Dump 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
Read 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
Write 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);
}