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i2c_tools.c
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/* vi: set sw=4 ts=4: */
/*
* Minimal i2c-tools implementation for busybox.
* Parts of code ported from i2c-tools:
* http://www.lm-sensors.org/wiki/I2CTools.
*
* Copyright (C) 2014 by Bartosz Golaszewski <bartekgola@gmail.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config I2CGET
//config: bool "i2cget (5.7 kb)"
//config: default y
//config: help
//config: Read from I2C/SMBus chip registers.
//config:
//config:config I2CSET
//config: bool "i2cset (6.9 kb)"
//config: default y
//config: help
//config: Set I2C registers.
//config:
//config:config I2CDUMP
//config: bool "i2cdump (7.2 kb)"
//config: default y
//config: help
//config: Examine I2C registers.
//config:
//config:config I2CDETECT
//config: bool "i2cdetect (7.3 kb)"
//config: default y
//config: help
//config: Detect I2C chips.
//config:
//config:config I2CTRANSFER
//config: bool "i2ctransfer (5.5 kb)"
//config: default y
//config: help
//config: Send user-defined I2C messages in one transfer.
//config:
//applet:IF_I2CGET(APPLET(i2cget, BB_DIR_USR_SBIN, BB_SUID_DROP))
//applet:IF_I2CSET(APPLET(i2cset, BB_DIR_USR_SBIN, BB_SUID_DROP))
//applet:IF_I2CDUMP(APPLET(i2cdump, BB_DIR_USR_SBIN, BB_SUID_DROP))
//applet:IF_I2CDETECT(APPLET(i2cdetect, BB_DIR_USR_SBIN, BB_SUID_DROP))
//applet:IF_I2CTRANSFER(APPLET(i2ctransfer, BB_DIR_USR_SBIN, BB_SUID_DROP))
/* not NOEXEC: if hw operation stalls, use less memory in "hung" process */
//kbuild:lib-$(CONFIG_I2CGET) += i2c_tools.o
//kbuild:lib-$(CONFIG_I2CSET) += i2c_tools.o
//kbuild:lib-$(CONFIG_I2CDUMP) += i2c_tools.o
//kbuild:lib-$(CONFIG_I2CDETECT) += i2c_tools.o
//kbuild:lib-$(CONFIG_I2CTRANSFER) += i2c_tools.o
/*
* Unsupported stuff:
*
* - upstream i2c-tools can also look-up i2c busses by name, we only accept
* numbers,
* - bank and bankreg parameters for i2cdump are not supported because of
* their limited usefulness (see i2cdump manual entry for more info),
* - i2cdetect doesn't look for bus info in /proc as it does in upstream, but
* it shouldn't be a problem in modern kernels.
*/
#include "libbb.h"
#include <linux/i2c.h>
#define I2CDUMP_NUM_REGS 256
#define I2CDETECT_MODE_AUTO 0
#define I2CDETECT_MODE_QUICK 1
#define I2CDETECT_MODE_READ 2
/* linux/i2c-dev.h from i2c-tools overwrites the one from linux uapi
* and defines symbols already defined by linux/i2c.h.
* Also, it defines a bunch of static inlines which we would rather NOT
* inline. What a mess.
* We need only these definitions from linux/i2c-dev.h:
*/
#define I2C_SLAVE 0x0703
#define I2C_SLAVE_FORCE 0x0706
#define I2C_FUNCS 0x0705
#define I2C_PEC 0x0708
#define I2C_SMBUS 0x0720
#define I2C_RDWR 0x0707
#define I2C_RDWR_IOCTL_MAX_MSGS 42
#define I2C_RDWR_IOCTL_MAX_MSGS_STR "42"
struct i2c_smbus_ioctl_data {
__u8 read_write;
__u8 command;
__u32 size;
union i2c_smbus_data *data;
};
struct i2c_rdwr_ioctl_data {
struct i2c_msg *msgs; /* pointers to i2c_msgs */
__u32 nmsgs; /* number of i2c_msgs */
};
/* end linux/i2c-dev.h */
/*
* This is needed for ioctl_or_perror_and_die() since it only accepts pointers.
*/
static ALWAYS_INLINE void *itoptr(int i)
{
return (void*)(intptr_t)i;
}
#if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP || ENABLE_I2CDETECT
static int32_t i2c_smbus_access(int fd, char read_write, uint8_t cmd,
int size, union i2c_smbus_data *data)
{
struct i2c_smbus_ioctl_data args;
args.read_write = read_write;
args.command = cmd;
args.size = size;
args.data = data;
return ioctl(fd, I2C_SMBUS, &args);
}
static int32_t i2c_smbus_read_byte(int fd)
{
union i2c_smbus_data data;
int err;
err = i2c_smbus_access(fd, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data);
if (err < 0)
return err;
return data.byte;
}
#endif
#if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP
static int32_t i2c_smbus_write_byte(int fd, uint8_t val)
{
return i2c_smbus_access(fd, I2C_SMBUS_WRITE,
val, I2C_SMBUS_BYTE, NULL);
}
static int32_t i2c_smbus_read_byte_data(int fd, uint8_t cmd)
{
union i2c_smbus_data data;
int err;
err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd,
I2C_SMBUS_BYTE_DATA, &data);
if (err < 0)
return err;
return data.byte;
}
static int32_t i2c_smbus_read_word_data(int fd, uint8_t cmd)
{
union i2c_smbus_data data;
int err;
err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd,
I2C_SMBUS_WORD_DATA, &data);
if (err < 0)
return err;
return data.word;
}
#endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */
#if ENABLE_I2CSET
static int32_t i2c_smbus_write_byte_data(int file,
uint8_t cmd, uint8_t value)
{
union i2c_smbus_data data;
data.byte = value;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd,
I2C_SMBUS_BYTE_DATA, &data);
}
static int32_t i2c_smbus_write_word_data(int file, uint8_t cmd, uint16_t value)
{
union i2c_smbus_data data;
data.word = value;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd,
I2C_SMBUS_WORD_DATA, &data);
}
static int32_t i2c_smbus_write_block_data(int file, uint8_t cmd,
uint8_t length, const uint8_t *values)
{
union i2c_smbus_data data;
if (length > I2C_SMBUS_BLOCK_MAX)
length = I2C_SMBUS_BLOCK_MAX;
memcpy(data.block+1, values, length);
data.block[0] = length;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd,
I2C_SMBUS_BLOCK_DATA, &data);
}
static int32_t i2c_smbus_write_i2c_block_data(int file, uint8_t cmd,
uint8_t length, const uint8_t *values)
{
union i2c_smbus_data data;
if (length > I2C_SMBUS_BLOCK_MAX)
length = I2C_SMBUS_BLOCK_MAX;
memcpy(data.block+1, values, length);
data.block[0] = length;
return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd,
I2C_SMBUS_I2C_BLOCK_BROKEN, &data);
}
#endif /* ENABLE_I2CSET */
#if ENABLE_I2CDUMP
/*
* Returns the number of bytes read, vals must hold at
* least I2C_SMBUS_BLOCK_MAX bytes.
*/
static int32_t i2c_smbus_read_block_data(int fd, uint8_t cmd, uint8_t *vals)
{
union i2c_smbus_data data;
int i, err;
err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd,
I2C_SMBUS_BLOCK_DATA, &data);
if (err < 0)
return err;
for (i = 1; i <= data.block[0]; i++)
*vals++ = data.block[i];
return data.block[0];
}
static int32_t i2c_smbus_read_i2c_block_data(int fd, uint8_t cmd,
uint8_t len, uint8_t *vals)
{
union i2c_smbus_data data;
int i, err;
if (len > I2C_SMBUS_BLOCK_MAX)
len = I2C_SMBUS_BLOCK_MAX;
data.block[0] = len;
err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd,
len == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN :
I2C_SMBUS_I2C_BLOCK_DATA, &data);
if (err < 0)
return err;
for (i = 1; i <= data.block[0]; i++)
*vals++ = data.block[i];
return data.block[0];
}
#endif /* ENABLE_I2CDUMP */
#if ENABLE_I2CDETECT
static int32_t i2c_smbus_write_quick(int fd, uint8_t val)
{
return i2c_smbus_access(fd, val, 0, I2C_SMBUS_QUICK, NULL);
}
#endif /* ENABLE_I2CDETECT */
static int i2c_bus_lookup(const char *bus_str)
{
return xstrtou_range(bus_str, 10, 0, 0xfffff);
}
#if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP
static int i2c_parse_bus_addr(const char *addr_str)
{
/* Slave address must be in range 0x03 - 0x77. */
return xstrtou_range(addr_str, 16, 0x03, 0x77);
}
static void i2c_set_pec(int fd, int pec)
{
ioctl_or_perror_and_die(fd, I2C_PEC,
itoptr(pec ? 1 : 0),
"can't set PEC");
}
#endif
#if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP || ENABLE_I2CTRANSFER
static void i2c_set_slave_addr(int fd, int addr, int force)
{
ioctl_or_perror_and_die(fd, force ? I2C_SLAVE_FORCE : I2C_SLAVE,
itoptr(addr),
"can't set address to 0x%02x", addr);
}
#endif
#if ENABLE_I2CGET || ENABLE_I2CSET
static int i2c_parse_data_addr(const char *data_addr)
{
/* Data address must be an 8 bit integer. */
return xstrtou_range(data_addr, 16, 0, 0xff);
}
#endif /* ENABLE_I2CGET || ENABLE_I2CSET */
/*
* Opens the device file associated with given i2c bus.
*
* Upstream i2c-tools also support opening devices by i2c bus name
* but we drop it here for size reduction.
*/
static int i2c_dev_open(int i2cbus)
{
char filename[sizeof("/dev/i2c-%d") + sizeof(int)*3];
int fd;
sprintf(filename, "/dev/i2c-%d", i2cbus);
fd = open(filename, O_RDWR);
if (fd < 0) {
if (errno == ENOENT) {
filename[8] = '/'; /* change to "/dev/i2c/%d" */
fd = xopen(filename, O_RDWR);
} else {
bb_perror_msg_and_die("can't open '%s'", filename);
}
}
return fd;
}
/* Size reducing helpers for xxx_check_funcs(). */
static void get_funcs_matrix(int fd, unsigned long *funcs)
{
ioctl_or_perror_and_die(fd, I2C_FUNCS, funcs,
"can't get adapter functionality matrix");
}
#if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP
static void check_funcs_test_end(int funcs, int pec, const char *err)
{
if (pec && !(funcs & (I2C_FUNC_SMBUS_PEC | I2C_FUNC_I2C)))
bb_simple_error_msg("warning: adapter does not support PEC");
if (err)
bb_error_msg_and_die(
"adapter has no %s capability", err);
}
#endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */
/*
* The below functions emit an error message and exit if the adapter doesn't
* support desired functionalities.
*/
#if ENABLE_I2CGET || ENABLE_I2CDUMP
static void check_read_funcs(int fd, int mode, int data_addr, int pec)
{
unsigned long funcs;
const char *err = NULL;
get_funcs_matrix(fd, &funcs);
switch (mode) {
case I2C_SMBUS_BYTE:
if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) {
err = "SMBus receive byte";
break;
}
if (data_addr >= 0 && !(funcs & I2C_FUNC_SMBUS_WRITE_BYTE))
err = "SMBus send byte";
break;
case I2C_SMBUS_BYTE_DATA:
if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE_DATA))
err = "SMBus read byte";
break;
case I2C_SMBUS_WORD_DATA:
if (!(funcs & I2C_FUNC_SMBUS_READ_WORD_DATA))
err = "SMBus read word";
break;
#if ENABLE_I2CDUMP
case I2C_SMBUS_BLOCK_DATA:
if (!(funcs & I2C_FUNC_SMBUS_READ_BLOCK_DATA))
err = "SMBus block read";
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
if (!(funcs & I2C_FUNC_SMBUS_READ_I2C_BLOCK))
err = "I2C block read";
break;
#endif /* ENABLE_I2CDUMP */
default:
bb_simple_error_msg_and_die("internal error");
}
check_funcs_test_end(funcs, pec, err);
}
#endif /* ENABLE_I2CGET || ENABLE_I2CDUMP */
#if ENABLE_I2CSET
static void check_write_funcs(int fd, int mode, int pec)
{
unsigned long funcs;
const char *err = NULL;
get_funcs_matrix(fd, &funcs);
switch (mode) {
case I2C_SMBUS_BYTE:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE))
err = "SMBus send byte";
break;
case I2C_SMBUS_BYTE_DATA:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
err = "SMBus write byte";
break;
case I2C_SMBUS_WORD_DATA:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_WORD_DATA))
err = "SMBus write word";
break;
case I2C_SMBUS_BLOCK_DATA:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_BLOCK_DATA))
err = "SMBus block write";
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_I2C_BLOCK))
err = "I2C block write";
break;
}
check_funcs_test_end(funcs, pec, err);
}
#endif /* ENABLE_I2CSET */
static void confirm_or_abort(void)
{
fprintf(stderr, "Continue? [y/N] ");
if (!bb_ask_y_confirmation())
bb_simple_error_msg_and_die("aborting");
}
/*
* Return only if user confirms the action, abort otherwise.
*
* The messages displayed here are much less elaborate than their i2c-tools
* counterparts - this is done for size reduction.
*/
static void confirm_action(int bus_addr, int mode, int data_addr, int pec)
{
bb_simple_error_msg("WARNING! This program can confuse your I2C bus");
/* Don't let the user break his/her EEPROMs */
if (bus_addr >= 0x50 && bus_addr <= 0x57 && pec) {
bb_simple_error_msg_and_die("this is I2C not smbus - using PEC on I2C "
"devices may result in data loss, aborting");
}
if (mode == I2C_SMBUS_BYTE && data_addr >= 0 && pec)
bb_simple_error_msg("WARNING! May interpret a write byte command "
"with PEC as a write byte data command");
if (pec)
bb_simple_error_msg("PEC checking enabled");
confirm_or_abort();
}
#if ENABLE_I2CGET
//usage:#define i2cget_trivial_usage
//usage: "[-fy] BUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]"
//usage:#define i2cget_full_usage "\n\n"
//usage: "Read from I2C/SMBus chip registers"
//usage: "\n"
//usage: "\n I2CBUS I2C bus number"
//usage: "\n ADDRESS 0x03-0x77"
//usage: "\nMODE is:"
//usage: "\n b Read byte data (default)"
//usage: "\n w Read word data"
//usage: "\n c Write byte/read byte"
//usage: "\n Append p for SMBus PEC"
//usage: "\n"
//usage: "\n -f Force access"
//usage: "\n -y Disable interactive mode"
int i2cget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int i2cget_main(int argc UNUSED_PARAM, char **argv)
{
const unsigned opt_f = (1 << 0), opt_y = (1 << 1);
int bus_num, bus_addr, data_addr = -1, status;
int mode = I2C_SMBUS_BYTE, pec = 0, fd;
unsigned opts;
opts = getopt32(argv, "^" "fy" "\0" "-2:?4"/*from 2 to 4 args*/);
argv += optind;
bus_num = i2c_bus_lookup(argv[0]);
bus_addr = i2c_parse_bus_addr(argv[1]);
if (argv[2]) {
data_addr = i2c_parse_data_addr(argv[2]);
mode = I2C_SMBUS_BYTE_DATA;
if (argv[3]) {
switch (argv[3][0]) {
case 'b': /* Already set */ break;
case 'w': mode = I2C_SMBUS_WORD_DATA; break;
case 'c': mode = I2C_SMBUS_BYTE; break;
default:
bb_simple_error_msg("invalid mode");
bb_show_usage();
}
pec = argv[3][1] == 'p';
}
}
fd = i2c_dev_open(bus_num);
check_read_funcs(fd, mode, data_addr, pec);
i2c_set_slave_addr(fd, bus_addr, opts & opt_f);
if (!(opts & opt_y))
confirm_action(bus_addr, mode, data_addr, pec);
if (pec)
i2c_set_pec(fd, 1);
switch (mode) {
case I2C_SMBUS_BYTE:
if (data_addr >= 0) {
status = i2c_smbus_write_byte(fd, data_addr);
if (status < 0)
bb_simple_error_msg("warning - write failed");
}
status = i2c_smbus_read_byte(fd);
break;
case I2C_SMBUS_WORD_DATA:
status = i2c_smbus_read_word_data(fd, data_addr);
break;
default: /* I2C_SMBUS_BYTE_DATA */
status = i2c_smbus_read_byte_data(fd, data_addr);
}
close(fd);
if (status < 0)
bb_simple_perror_msg_and_die("read failed");
printf("0x%0*x\n", mode == I2C_SMBUS_WORD_DATA ? 4 : 2, status);
return 0;
}
#endif /* ENABLE_I2CGET */
#if ENABLE_I2CSET
//usage:#define i2cset_trivial_usage
//usage: "[-fy] [-m MASK] BUS CHIP-ADDRESS DATA-ADDRESS [VALUE] ... [MODE]"
//usage:#define i2cset_full_usage "\n\n"
//usage: "Set I2C registers"
//usage: "\n"
//usage: "\n I2CBUS I2C bus number"
//usage: "\n ADDRESS 0x03-0x77"
//usage: "\nMODE is:"
//usage: "\n c Byte, no value"
//usage: "\n b Byte data (default)"
//usage: "\n w Word data"
//usage: "\n i I2C block data"
//usage: "\n s SMBus block data"
//usage: "\n Append p for SMBus PEC"
//usage: "\n"
//usage: "\n -f Force access"
//usage: "\n -y Disable interactive mode"
//usage: "\n -r Read back and compare the result"
//usage: "\n -m MASK Mask specifying which bits to write"
int i2cset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int i2cset_main(int argc, char **argv)
{
const unsigned opt_f = (1 << 0), opt_y = (1 << 1),
opt_m = (1 << 2), opt_r = (1 << 3);
int bus_num, bus_addr, data_addr, mode = I2C_SMBUS_BYTE, pec = 0;
int val, blen, mask, fd, status;
unsigned char block[I2C_SMBUS_BLOCK_MAX];
char *opt_m_arg = NULL;
unsigned opts;
opts = getopt32(argv, "^"
"fym:r"
"\0" "-3", /* minimum 3 args */
&opt_m_arg
);
argv += optind;
argc -= optind;
argc--; /* now argv[argc] is last arg */
bus_num = i2c_bus_lookup(argv[0]);
bus_addr = i2c_parse_bus_addr(argv[1]);
data_addr = i2c_parse_data_addr(argv[2]);
if (argv[3]) {
if (!argv[4] && argv[3][0] != 'c') {
mode = I2C_SMBUS_BYTE_DATA; /* Implicit b */
} else {
switch (argv[argc][0]) {
case 'c': /* Already set */
break;
case 'b': mode = I2C_SMBUS_BYTE_DATA;
break;
case 'w': mode = I2C_SMBUS_WORD_DATA;
break;
case 's': mode = I2C_SMBUS_BLOCK_DATA;
break;
case 'i': mode = I2C_SMBUS_I2C_BLOCK_DATA;
break;
default:
bb_simple_error_msg("invalid mode");
bb_show_usage();
}
pec = (argv[argc][1] == 'p');
if (mode == I2C_SMBUS_BLOCK_DATA
|| mode == I2C_SMBUS_I2C_BLOCK_DATA
) {
if (pec && mode == I2C_SMBUS_I2C_BLOCK_DATA)
bb_simple_error_msg_and_die(
"PEC not supported for I2C "
"block writes");
if (opts & opt_m)
bb_simple_error_msg_and_die(
"mask not supported for block "
"writes");
}
}
}
/* Prepare the value(s) to be written according to current mode. */
mask = 0;
blen = 0;
switch (mode) {
case I2C_SMBUS_BYTE_DATA:
val = xstrtou_range(argv[3], 0, 0, 0xff);
break;
case I2C_SMBUS_WORD_DATA:
val = xstrtou_range(argv[3], 0, 0, 0xffff);
break;
case I2C_SMBUS_BLOCK_DATA:
case I2C_SMBUS_I2C_BLOCK_DATA:
for (blen = 3; blen < argc; blen++)
block[blen - 3] = xstrtou_range(argv[blen], 0, 0, 0xff);
blen -= 3;
val = -1;
break;
default:
val = -1;
break;
}
if (opts & opt_m) {
mask = xstrtou_range(opt_m_arg, 0, 0,
(mode == I2C_SMBUS_BYTE ||
mode == I2C_SMBUS_BYTE_DATA) ? 0xff : 0xffff);
}
fd = i2c_dev_open(bus_num);
check_write_funcs(fd, mode, pec);
i2c_set_slave_addr(fd, bus_addr, opts & opt_f);
if (!(opts & opt_y))
confirm_action(bus_addr, mode, data_addr, pec);
/*
* If we're using mask - read the current value here and adjust the
* value to be written.
*/
if (opts & opt_m) {
int tmpval;
switch (mode) {
case I2C_SMBUS_BYTE:
tmpval = i2c_smbus_read_byte(fd);
break;
case I2C_SMBUS_WORD_DATA:
tmpval = i2c_smbus_read_word_data(fd, data_addr);
break;
default:
tmpval = i2c_smbus_read_byte_data(fd, data_addr);
}
if (tmpval < 0)
bb_simple_perror_msg_and_die("can't read old value");
val = (val & mask) | (tmpval & ~mask);
if (!(opts & opt_y)) {
bb_error_msg("old value 0x%0*x, write mask "
"0x%0*x, will write 0x%0*x to register "
"0x%02x",
mode == I2C_SMBUS_WORD_DATA ? 4 : 2, tmpval,
mode == I2C_SMBUS_WORD_DATA ? 4 : 2, mask,
mode == I2C_SMBUS_WORD_DATA ? 4 : 2, val,
data_addr);
confirm_or_abort();
}
}
if (pec)
i2c_set_pec(fd, 1);
switch (mode) {
case I2C_SMBUS_BYTE:
status = i2c_smbus_write_byte(fd, data_addr);
break;
case I2C_SMBUS_WORD_DATA:
status = i2c_smbus_write_word_data(fd, data_addr, val);
break;
case I2C_SMBUS_BLOCK_DATA:
status = i2c_smbus_write_block_data(fd, data_addr,
blen, block);
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
status = i2c_smbus_write_i2c_block_data(fd, data_addr,
blen, block);
break;
default: /* I2C_SMBUS_BYTE_DATA */
status = i2c_smbus_write_byte_data(fd, data_addr, val);
break;
}
if (status < 0)
bb_simple_perror_msg_and_die("write failed");
if (pec)
i2c_set_pec(fd, 0); /* Clear PEC. */
/* No readback required - we're done. */
if (!(opts & opt_r))
return 0;
switch (mode) {
case I2C_SMBUS_BYTE:
status = i2c_smbus_read_byte(fd);
val = data_addr;
break;
case I2C_SMBUS_WORD_DATA:
status = i2c_smbus_read_word_data(fd, data_addr);
break;
default: /* I2C_SMBUS_BYTE_DATA */
status = i2c_smbus_read_byte_data(fd, data_addr);
}
if (status < 0) {
puts("Warning - readback failed");
} else
if (status != val) {
printf("Warning - data mismatch - wrote "
"0x%0*x, read back 0x%0*x\n",
mode == I2C_SMBUS_WORD_DATA ? 4 : 2, val,
mode == I2C_SMBUS_WORD_DATA ? 4 : 2, status);
} else {
printf("Value 0x%0*x written, readback matched\n",
mode == I2C_SMBUS_WORD_DATA ? 4 : 2, val);
}
return 0;
}
#endif /* ENABLE_I2CSET */
#if ENABLE_I2CDUMP
static int read_block_data(int buf_fd, int mode, int *block)
{
uint8_t cblock[I2C_SMBUS_BLOCK_MAX + I2CDUMP_NUM_REGS];
int res, blen = 0, tmp, i;
if (mode == I2C_SMBUS_BLOCK_DATA) {
blen = i2c_smbus_read_block_data(buf_fd, 0, cblock);
if (blen <= 0)
goto fail;
} else {
for (res = 0; res < I2CDUMP_NUM_REGS; res += tmp) {
tmp = i2c_smbus_read_i2c_block_data(
buf_fd, res, I2C_SMBUS_BLOCK_MAX,
cblock + res);
if (tmp <= 0) {
blen = tmp;
goto fail;
}
}
if (res >= I2CDUMP_NUM_REGS)
res = I2CDUMP_NUM_REGS;
for (i = 0; i < res; i++)
block[i] = cblock[i];
if (mode != I2C_SMBUS_BLOCK_DATA)
for (i = res; i < I2CDUMP_NUM_REGS; i++)
block[i] = -1;
}
return blen;
fail:
bb_error_msg_and_die("block read failed: %d", blen);
}
/* Dump all but word data. */
static void dump_data(int bus_fd, int mode, unsigned first,
unsigned last, int *block, int blen)
{
int i, j, res;
puts(" 0 1 2 3 4 5 6 7 8 9 a b c d e f"
" 0123456789abcdef");
for (i = 0; i < I2CDUMP_NUM_REGS; i += 0x10) {
if (mode == I2C_SMBUS_BLOCK_DATA && i >= blen)
break;
if (i/16 < first/16)
continue;
if (i/16 > last/16)
break;
printf("%02x: ", i);
for (j = 0; j < 16; j++) {
fflush_all();
/* Skip unwanted registers */
if (i+j < first || i+j > last) {
printf(" ");
if (mode == I2C_SMBUS_WORD_DATA) {
printf(" ");
j++;
}
continue;
}
switch (mode) {
case I2C_SMBUS_BYTE_DATA:
res = i2c_smbus_read_byte_data(bus_fd, i+j);
block[i+j] = res;
break;
case I2C_SMBUS_WORD_DATA:
res = i2c_smbus_read_word_data(bus_fd, i+j);
if (res < 0) {
block[i+j] = res;
block[i+j+1] = res;
} else {
block[i+j] = res & 0xff;
block[i+j+1] = res >> 8;
}
break;
case I2C_SMBUS_BYTE:
res = i2c_smbus_read_byte(bus_fd);
block[i+j] = res;
break;
default:
res = block[i+j];
}
if (mode == I2C_SMBUS_BLOCK_DATA &&
i+j >= blen) {
printf(" ");
} else if (res < 0) {
printf("XX ");
if (mode == I2C_SMBUS_WORD_DATA)
printf("XX ");
} else {
printf("%02x ", block[i+j]);
if (mode == I2C_SMBUS_WORD_DATA)
printf("%02x ", block[i+j+1]);
}
if (mode == I2C_SMBUS_WORD_DATA)
j++;
}
printf(" ");
for (j = 0; j < 16; j++) {
if (mode == I2C_SMBUS_BLOCK_DATA && i+j >= blen)
break;
/* Skip unwanted registers */
if (i+j < first || i+j > last) {
bb_putchar(' ');
continue;
}
res = block[i+j];
if (res < 0) {
bb_putchar('X');
} else if (res == 0x00 || res == 0xff) {
bb_putchar('.');
} else if (res < 32 || res >= 127) {
bb_putchar('?');
} else {
bb_putchar(res);
}
}
bb_putchar('\n');
}
}
static void dump_word_data(int bus_fd, unsigned first, unsigned last)
{
int i, j, rv;
/* Word data. */
puts(" 0,8 1,9 2,a 3,b 4,c 5,d 6,e 7,f");
for (i = 0; i < 256; i += 8) {
if (i/8 < first/8)
continue;
if (i/8 > last/8)
break;
printf("%02x: ", i);
for (j = 0; j < 8; j++) {
/* Skip unwanted registers. */
if (i+j < first || i+j > last) {
printf(" ");
continue;
}
rv = i2c_smbus_read_word_data(bus_fd, i+j);
if (rv < 0)
printf("XXXX ");
else
printf("%04x ", rv & 0xffff);
}
bb_putchar('\n');
}
}
//usage:#define i2cdump_trivial_usage
//usage: "[-fy] [-r FIRST-LAST] BUS ADDR [MODE]"
//usage:#define i2cdump_full_usage "\n\n"
//usage: "Examine I2C registers"
//usage: "\n"
//usage: "\n I2CBUS I2C bus number"
//usage: "\n ADDRESS 0x03-0x77"
//usage: "\nMODE is:"
//usage: "\n b Byte (default)"
//usage: "\n w Word"
//usage: "\n W Word on even register addresses"
//usage: "\n i I2C block"
//usage: "\n s SMBus block"
//usage: "\n c Consecutive byte"
//usage: "\n Append p for SMBus PEC"
//usage: "\n"
//usage: "\n -f Force access"
//usage: "\n -y Disable interactive mode"
//usage: "\n -r Limit the number of registers being accessed"
int i2cdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int i2cdump_main(int argc UNUSED_PARAM, char **argv)
{
const unsigned opt_f = (1 << 0), opt_y = (1 << 1),
opt_r = (1 << 2);
int bus_num, bus_addr, mode = I2C_SMBUS_BYTE_DATA, even = 0, pec = 0;
unsigned first = 0x00, last = 0xff, opts;
int block[I2CDUMP_NUM_REGS];
char *opt_r_str, *dash;
int fd, res;
opts = getopt32(argv, "^"
"fyr:"
"\0" "-2:?3" /* from 2 to 3 args */,
&opt_r_str
);
argv += optind;
bus_num = i2c_bus_lookup(argv[0]);
bus_addr = i2c_parse_bus_addr(argv[1]);
if (argv[2]) {
switch (argv[2][0]) {
case 'b': /* Already set. */ break;
case 'c': mode = I2C_SMBUS_BYTE; break;
case 'w': mode = I2C_SMBUS_WORD_DATA; break;
case 'W':
mode = I2C_SMBUS_WORD_DATA;
even = 1;
break;
case 's': mode = I2C_SMBUS_BLOCK_DATA; break;
case 'i': mode = I2C_SMBUS_I2C_BLOCK_DATA; break;
default:
bb_simple_error_msg_and_die("invalid mode");
}
if (argv[2][1] == 'p') {
if (argv[2][0] == 'W' || argv[2][0] == 'i') {
bb_simple_error_msg_and_die(
"pec not supported for -W and -i");
} else {
pec = 1;
}
}
}
if (opts & opt_r) {
first = strtol(opt_r_str, &dash, 0);
if (dash == opt_r_str || *dash != '-' || first > 0xff)
bb_simple_error_msg_and_die("invalid range");
last = xstrtou_range(++dash, 0, first, 0xff);
/* Range is not available for every mode. */
switch (mode) {