Adds a minimal implementation of i2cget, i2cset, i2cdump and i2cdetect tools. Supports most features of upstream i2c-tools.
Signed-off-by: Bartosz Golaszewski <[email protected]> --- Finally had some time to finish i2cdetect. Total size added by this patch is: function old new delta .rodata 152865 155969 +3104 i2cdump_main - 1437 +1437 i2cset_main - 1266 +1266 i2cdetect_main - 735 +735 list_i2c_busses_and_exit - 619 +619 packed_usage 29741 30259 +518 i2cget_main - 461 +461 i2c_funcs_tab - 256 +256 check_read_funcs - 201 +201 confirm_action - 141 +141 i2c_dev_open - 123 +123 adap_descs - 64 +64 check_funcs_test_end - 53 +53 confirm_or_abort - 51 +51 i2c_smbus_read_word_data - 42 +42 i2c_smbus_read_byte_data - 42 +42 i2c_smbus_access - 41 +41 i2c_smbus_read_byte - 40 +40 i2c_set_slave_addr - 36 +36 applet_names 2451 2483 +32 applet_main 2856 2888 +32 i2c_bus_lookup - 17 +17 xstrtoi_range - 8 +8 applet_nameofs 714 722 +8 applet_install_loc 179 181 +2 ------------------------------------------------------------------------------ (add/remove: 20/0 grow/shrink: 6/0 up/down: 9329/0) Total: 9329 bytes text data bss dec hex filename 813881 4123 9552 827556 ca0a4 busybox_old 822298 4123 9552 835973 cc185 busybox_unstripped It might seem big, but it supports most features of upstream with three times less lines-of-code. It's a big patch, so it would be nice to merge it in order to make it easier to test and find bugs. There's still some work to do e.g. splitting i2cdump_main() into smaller functions. Best regards, Bartosz Golaszewski miscutils/i2c_tools.c | 1416 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1416 insertions(+) create mode 100644 miscutils/i2c_tools.c diff --git a/miscutils/i2c_tools.c b/miscutils/i2c_tools.c new file mode 100644 index 0000000..6596bab --- /dev/null +++ b/miscutils/i2c_tools.c @@ -0,0 +1,1416 @@ +/* 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 <[email protected]> + * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +//config:config I2CGET +//config: bool "i2cget" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: Read from I2C/SMBus chip registers. +//config: +//config:config I2CSET +//config: bool "i2cset" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: Set I2C registers. +//config: +//config:config I2CDUMP +//config: bool "i2cdump" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: Examine I2C registers. +//config: +//config:config I2CDETECT +//config: bool "i2cdetect" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: Detect I2C chips. +//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)) + +//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 + +//usage:#define i2cget_trivial_usage +//usage: "[-f] [-y] BUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]" +//usage:#define i2cget_full_usage "\n\n" +//usage: "Read from I2C/SMBus chip registers\n" +//usage: "\n I2CBUS is an i2c bus number" +//usage: "\n ADDRESS is an integer (0x03 - 0x77)" +//usage: "\n MODE is one of:" +//usage: "\n b (read byte data, default)" +//usage: "\n w (read word data)" +//usage: "\n c (write byte/read byte)" +//usage: "\n\n Append p for SMBus PEC" +//usage: "\n\n -f - force access to device" +//usage: "\n -y - disable interactive mode" +//usage: +//usage:#define i2cset_trivial_usage +//usage: "[-f] [-y] [-m MASK] BUS CHIP-ADDR DATA-ADDR [VALUE] ... [MODE]" +//usage:#define i2cset_full_usage "\n\n" +//usage: "Set I2C registers\n" +//usage: "\n I2CBUS is an i2c bus number" +//usage: "\n ADDRESS is an integer (0x03 - 0x77)" +//usage: "\n MODE is one of:" +//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\n Append p for SMBus PEC" +//usage: "\n\n -f - force access to device" +//usage: "\n -y - disable interactive mode" +//usage: "\n -r - read back and compare the result" +//usage: "\n -m - mask specifying which bits to write" +//usage: +//usage:#define i2cdump_trivial_usage +//usage: "[-f] [-r FIRST-LAST] [-y] BUS ADDR [MODE]" +//usage:#define i2cdump_full_usage "\n\n" +//usage: "Examine I2C registers\n" +//usage: "\n I2CBUS is an i2c bus number" +//usage: "\n ADDRESS is an integer (0x03 - 0x77)" +//usage: "\n MODE is one of:" +//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\n Append p for SMBus PEC" +//usage: "\n\n -f - force access to device" +//usage: "\n -y - disable interactive mode" +//usage: "\n -r - limit the number of registers being accessed" +//usage: +//usage:#define i2cdetect_trivial_usage +//usage: "[-F I2CBUS] [-l] [-y] [-a] [-q|-r] I2CBUS [FIRST LAST]" +//usage:#define i2cdetect_full_usage "\n\n" +//usage: "Detect I2C chips.\n" +//usage: "\n I2CBUS is an i2c bus number" +//usage: "\n FIRST and LAST limit the probing range if provided" +//usage: "\n\n -l - output a list of installed busses" +//usage: "\n -y - disable interactive mode" +//usage: "\n -a - force scanning of non-regular addresses" +//usage: "\n -q - use smbus quick write commands for probing (default)" +//usage: "\n -r - use smbus read byte commands for probing" +//usage: "\n -F - display the list of functionalities" +//usage: + +/* + * 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" + +/* + * /dev/i2c-X ioctl commands. The ioctl's parameter is always an unsigned long, + * except for: + * - I2C_FUNCS, takes pointer to an unsigned long + * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data + * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data + */ + +/* + * NOTE: Slave address is 7 or 10 bits, but 10-bit addresses + * are not supported due to code brokenness. + */ + +/* Use this slave address. */ +#define I2C_SLAVE 0x0703 +/* Use this slave address, even if it is already in use by a driver. */ +#define I2C_SLAVE_FORCE 0x0706 +/* 0 for 7 bit addrs, != 0 for 10 bit. */ +#define I2C_TENBIT 0x0704 +/* Get the adapter functionality mask. */ +#define I2C_FUNCS 0x0705 +/* Combined R/W transfer (one STOP only). */ +#define I2C_RDWR 0x0707 +/* != 0 to use PEC with SMBus. */ +#define I2C_PEC 0x0708 +/* SMBus transfer. */ +#define I2C_SMBUS 0x0720 + +/* Structure used in the I2C_SMBUS ioctl call. */ +struct i2c_smbus_ioctl_data { + uint8_t read_write; + uint8_t command; + uint32_t size; + union i2c_smbus_data *data; +}; + +/* Structure used in the I2C_RDWR ioctl call. */ +struct i2c_rdwr_ioctl_data { + struct i2c_msg *msgs; /* Pointers to i2c_msgs. */ + uint32_t nmsgs; /* Number of i2c_msgs. */ +}; + +/* As specified in SMBus standard. */ +#define I2C_SMBUS_BLOCK_MAX 32 +/* Not specified but we use same structure. */ +#define I2C_SMBUS_I2C_BLOCK_MAX 32 + +/* Data for SMBus Messages. */ +union i2c_smbus_data { + uint8_t byte; + uint16_t word; + /* block[0] is used for length and one more for PEC */ + uint8_t block[I2C_SMBUS_BLOCK_MAX + 2]; +}; + +#define I2C_RDRW_IOCTL_MAX_MSGS 42 +#define I2C_MAX_REGS 256 + +/* Smbus_access read or write markers. */ +#define I2C_SMBUS_READ 1 +#define I2C_SMBUS_WRITE 0 + +/* SMBus transaction types (size parameter in the below functions). */ +#define I2C_SMBUS_QUICK 0 +#define I2C_SMBUS_BYTE 1 +#define I2C_SMBUS_BYTE_DATA 2 +#define I2C_SMBUS_WORD_DATA 3 +#define I2C_SMBUS_PROC_CALL 4 +#define I2C_SMBUS_BLOCK_DATA 5 +#define I2C_SMBUS_I2C_BLOCK_BROKEN 6 +#define I2C_SMBUS_BLOCK_PROC_CALL 7 +#define I2C_SMBUS_I2C_BLOCK_DATA 8 + +#define DETECT_MODE_AUTO 0 +#define DETECT_MODE_QUICK 1 +#define DETECT_MODE_READ 2 + +/* Defines to determine what functionality is present. */ +#define I2C_FUNC_I2C 0x00000001 +#define I2C_FUNC_10BIT_ADDR 0x00000002 +#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 +#define I2C_FUNC_SMBUS_PEC 0x00000008 +#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 +#define I2C_FUNC_SMBUS_QUICK 0x00010000 +#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 +#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 +#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 +#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 +#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 +#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 +#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 +#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 +#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 +#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 +#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 + +#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ + I2C_FUNC_SMBUS_WRITE_BYTE) +#define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ + I2C_FUNC_SMBUS_WRITE_BYTE_DATA) +#define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ + I2C_FUNC_SMBUS_WRITE_WORD_DATA) +#define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ + I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) +#define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ + I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) + +/* + * This is needed for ioctl_or_perror_and_die() since it only accepts pointers. + */ +static void *itoptr(int i) +{ + return (void*)(intptr_t)i; +} + +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 0xff & data.byte; +} + +#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 0xff & 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 0xffff & 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[i-1] = 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[i-1] = 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 xstrtoi_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 xstrtoi_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), + "Could not set PEC"); +} +#endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */ + +#if ENABLE_I2CGET || ENABLE_I2CSET +static int i2c_parse_data_addr(const char *data_addr) +{ + /* Data address must be an 8 bit integer. */ + return xstrtoi_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[32]; + int fd; + + snprintf(filename, sizeof(filename), "/dev/i2c-%d", i2cbus); + fd = open(filename, O_RDWR); + if (fd < 0 && errno == ENOENT) { + snprintf(filename, sizeof(filename), "/dev/i2c/%d", i2cbus); + fd = open(filename, O_RDWR); + } + + if (fd < 0) + bb_perror_msg_and_die( + "Could not open /dev/i2c-%d or /dev/i2c/%d", + i2cbus, i2cbus); + + return fd; +} + +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), + "Could not set address to 0x%02x", addr); +} + +/* 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, + "Could not get the 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))) + fprintf(stderr, + "Warning: Adapter does not seem to support PEC\n"); + + if (err) + bb_error_msg_and_die( + "Adapter does not have %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_error_msg_and_die("Programmer goofed!"); + } + 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] "); + fflush(stdout); + if (!bb_ask_confirmation()) + bb_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) +{ + fprintf(stderr, "WARNING! This program can confuse your I2C bus\n"); + + /* Don't let the user break his/her EEPROMs */ + if (bus_addr >= 0x50 && bus_addr <= 0x57 && pec) { + fprintf(stderr, "This is I2C not smbus - using PEC on I2C " + "devices may result in data loss. Aborting.\n"); + xfunc_die(); + } + + if (mode == I2C_SMBUS_BYTE && data_addr >= 0 && pec) + fprintf(stderr, "WARNING! May interpret a write byte command " + "with PEC as a write byte data command!\n"); + + if (pec) + fprintf(stderr, "PEC checking enabled.\n"); + + confirm_or_abort(); +} + +#if ENABLE_I2CGET +int i2cget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int i2cget_main(int argc, char **argv) +{ + static const unsigned opt_f = (1 << 0), opt_y = (1 << 1); + static const char *const optstr = "fy"; + + int bus_num, bus_addr, data_addr = -1, status; + int mode = I2C_SMBUS_BYTE, pec = 0, fd; + unsigned opts; + + opts = getopt32(argv, optstr); + argv += optind; + argc -= optind; + + if (argc < 2) + bb_show_usage(); + + bus_num = i2c_bus_lookup(argv[0]); + bus_addr = i2c_parse_bus_addr(argv[1]); + + if (argc > 2) { + data_addr = i2c_parse_data_addr(argv[2]); + mode = I2C_SMBUS_BYTE_DATA; + } + + if (argc > 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_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) + fprintf(stderr, "Warning - write failed\n"); + } + 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_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 +int i2cset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int i2cset_main(int argc, char **argv) +{ + static const unsigned opt_f = (1 << 0), opt_y = (1 << 1), + opt_m = (1 << 2), opt_r = (1 << 3); + static const char *const optstr = "fym:r"; + + int bus_num, bus_addr, data_addr, mode = I2C_SMBUS_BYTE, pec = 0; + int val, blen = 0, mask = 0, fd, status; + unsigned char block[I2C_SMBUS_BLOCK_MAX]; + char *opt_m_arg = NULL; + unsigned opts; + + opts = getopt32(argv, optstr, &opt_m_arg); + argv += optind; + argc -= optind; + + if (argc < 3) + bb_show_usage(); + + bus_num = i2c_bus_lookup(argv[0]); + bus_addr = i2c_parse_bus_addr(argv[1]); + data_addr = i2c_parse_data_addr(argv[2]); + + if (argc > 3) { + if (argc == 4 && argv[3][0] != 'c') { + mode = I2C_SMBUS_BYTE_DATA; /* Implicit b */ + } else { + switch (argv[argc-1][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_error_msg("Invalid mode"); + bb_show_usage(); + } + + pec = argv[argc-1][1] == 'p'; + if (mode == I2C_SMBUS_BLOCK_DATA || + mode == I2C_SMBUS_I2C_BLOCK_DATA) { + if (pec && mode == I2C_SMBUS_I2C_BLOCK_DATA) + bb_error_msg_and_die( + "PEC not supported for I2C " + "block writes!"); + if (opts & opt_m) + bb_error_msg_and_die( + "Mask not supported for block " + "writes!\n"); + } + } + } + + /* Prepare the value(s) to be written according to current mode. */ + switch (mode) { + case I2C_SMBUS_BYTE_DATA: + val = xstrtoi_range(argv[3], 0, 0, 0xff); + break; + case I2C_SMBUS_WORD_DATA: + val = xstrtoi_range(argv[3], 0, 0, 0xffff); + break; + case I2C_SMBUS_BLOCK_DATA: + case I2C_SMBUS_I2C_BLOCK_DATA: + for (blen = 3; blen < (argc - 1); blen++) + block[blen] = xstrtoi_range(argv[blen], 0, 0, 0xff); + val = -1; + break; + default: + val = -1; + break; + } + + if (opts & opt_m) { + mask = xstrtoi_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_perror_msg_and_die("Failed to read old value"); + + val = (val & mask) | (tmpval & ~mask); + + if (!(opts & opt_y)) { + fprintf(stderr, "Old value 0x%0*x, write mask " + "0x%0*x: Will write 0x%0*x to register " + "0x%02x\n", + 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_perror_msg_and_die("Write failed\n"); + + 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) { + printf("Warning - readback failed\n"); + } 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 +int i2cdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int i2cdump_main(int argc, char **argv) +{ + static const unsigned opt_f = (1 << 0), opt_y = (1 << 1), + opt_r = (1 << 2); + static const char *const optstr = "fyr:"; + + int bus_num, bus_addr, mode = I2C_SMBUS_BYTE_DATA, even = 0, pec = 0; + int first = 0x00, last = 0xff, fd, i, j, res, blen = 0, tmp; + unsigned char cblock[I2C_SMBUS_BLOCK_MAX + I2C_MAX_REGS]; + unsigned char block[I2C_SMBUS_BLOCK_MAX]; + char *opt_r_str, *dash; + unsigned opts; + + opts = getopt32(argv, optstr, &opt_r_str); + argv += optind; + argc -= optind; + + if (argc < 2) + bb_show_usage(); + + bus_num = i2c_bus_lookup(argv[0]); + bus_addr = i2c_parse_bus_addr(argv[1]); + + if (argc > 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_error_msg_and_die("Invalid mode"); + } + + if (argv[2][1] == 'p') { + if (argv[2][0] == 'W' || argv[2][0] == 'i') { + bb_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 < 0 || first > 0xff) + bb_error_msg_and_die("Invalid range"); + last = xstrtoi_range(++dash, 0, first, 0xff); + + /* Range is not available for every mode */ + switch (mode) { + case I2C_SMBUS_BYTE: + case I2C_SMBUS_BYTE_DATA: + break; + case I2C_SMBUS_WORD_DATA: + if (!even || (!(first % 2) && last % 2)) + break; + /* Fall through */ + default: + bb_error_msg_and_die( + "Range not compatible with selected mode!"); + } + } + + fd = i2c_dev_open(bus_num); + check_read_funcs(fd, mode, -1 /* data_addr */, pec); + i2c_set_slave_addr(fd, bus_addr, opts & opt_f); + + if (pec) + i2c_set_pec(fd, 1); + + if (!(opts & opt_y)) + confirm_action(bus_addr, mode, -1 /* data_addr */, pec); + + /* All but word data */ + if (mode != I2C_SMBUS_WORD_DATA || even) { + /* + * FIXME This section has been ported from upstream i2cdump. + * It has been reworked a bit but is still pretty spaghetti + * and needs splitting into several functions. + */ + if (mode == I2C_SMBUS_BLOCK_DATA || + mode == I2C_SMBUS_I2C_BLOCK_DATA) { + res = i2c_smbus_read_block_data(fd, 0, cblock); + blen = res; + } else { + for (res = 0; res < I2C_MAX_REGS; res += tmp) { + tmp = i2c_smbus_read_i2c_block_data( + fd, res, I2C_SMBUS_BLOCK_MAX, + cblock + res); + if (tmp < 0) { + bb_error_msg_and_die( + "Block read failed"); + } + } + if (res >= I2C_MAX_REGS) + res = I2C_MAX_REGS; + for (i = 0; i < res; i++) + block[i] = cblock[i]; + if (mode != I2C_SMBUS_BLOCK_DATA) + for (i = res; i < I2C_MAX_REGS; i++) + cblock[i] = -1; + } + + if (mode == I2C_SMBUS_BYTE) { + res = i2c_smbus_write_byte(fd, first); + if (res < 0) + bb_perror_msg_and_die( + "Error: Write start address failed"); + } + + printf(" 0 1 2 3 4 5 6 7 8 9 a b c d e f" + " 0123456789abcdef\n"); + + for (i = 0; i < I2C_MAX_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(stdout); + /* 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(fd, i+j); + block[i+j] = res; + break; + case I2C_SMBUS_WORD_DATA: + res = i2c_smbus_read_word_data(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(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) { + printf(" "); + continue; + } + + res = block[i+j]; + if (res < 0) { + printf("X"); + } else if ((res & 0xff) == 0x00 || + (res & 0xff) == 0xff) { + printf("."); + } else if ((res & 0xff) < 32 || + (res & 0xff) >= 127) { + printf("?"); + } else { + printf("%c", res & 0xff); + } + } + printf("\n"); + } + } else { + /* Word data. */ + printf(" 0,8 1,9 2,a 3,b 4,c 5,d 6,e 7,f\n"); + 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; + } + + res = i2c_smbus_read_word_data(fd, i+j); + if (res < 0) + printf("XXXX "); + else + printf("%04x ", res & 0xffff); + } + printf("\n"); + } + } + + return 0; +} +#endif /* ENABLE_I2CDUMP */ + +#if ENABLE_I2CDETECT +enum adapter_type { + ADT_DUMMY = 0, + ADT_ISA, + ADT_I2C, + ADT_SMBUS, +}; + +struct adap_desc { + const char *funcs; + const char *algo; +}; + +static const struct adap_desc adap_descs[] = { + { .funcs = "dummy", + .algo = "Dummy bus", }, + { .funcs = "isa", + .algo = "ISA bus", }, + { .funcs = "i2c", + .algo = "I2C adapter", }, + { .funcs = "smbus", + .algo = "SMBus adapter", }, +}; + +struct i2c_func +{ + long value; + const char* name; +}; + +static const struct i2c_func i2c_funcs_tab[] = { + { .value = I2C_FUNC_I2C, + .name = "I2C" }, + { .value = I2C_FUNC_SMBUS_QUICK, + .name = "SMBus Quick Command" }, + { .value = I2C_FUNC_SMBUS_WRITE_BYTE, + .name = "SMBus Send Byte" }, + { .value = I2C_FUNC_SMBUS_READ_BYTE, + .name = "SMBus Receive Byte" }, + { .value = I2C_FUNC_SMBUS_WRITE_BYTE_DATA, + .name = "SMBus Write Byte" }, + { .value = I2C_FUNC_SMBUS_READ_BYTE_DATA, + .name = "SMBus Read Byte" }, + { .value = I2C_FUNC_SMBUS_WRITE_WORD_DATA, + .name = "SMBus Write Word" }, + { .value = I2C_FUNC_SMBUS_READ_WORD_DATA, + .name = "SMBus Read Word" }, + { .value = I2C_FUNC_SMBUS_PROC_CALL, + .name = "SMBus Process Call" }, + { .value = I2C_FUNC_SMBUS_WRITE_BLOCK_DATA, + .name = "SMBus Block Write" }, + { .value = I2C_FUNC_SMBUS_READ_BLOCK_DATA, + .name = "SMBus Block Read" }, + { .value = I2C_FUNC_SMBUS_BLOCK_PROC_CALL, + .name = "SMBus Block Process Call" }, + { .value = I2C_FUNC_SMBUS_PEC, + .name = "SMBus PEC" }, + { .value = I2C_FUNC_SMBUS_WRITE_I2C_BLOCK, + .name = "I2C Block Write" }, + { .value = I2C_FUNC_SMBUS_READ_I2C_BLOCK, + .name = "I2C Block Read" }, + { .value = 0, .name = NULL } +}; + +static enum adapter_type i2cdetect_get_funcs(int bus) +{ + enum adapter_type ret; + unsigned long funcs; + int fd; + + fd = i2c_dev_open(bus); + + get_funcs_matrix(fd, &funcs); + if (funcs & I2C_FUNC_I2C) + ret = ADT_I2C; + else if (funcs & (I2C_FUNC_SMBUS_BYTE | + I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA)) + ret = ADT_SMBUS; + else + ret = ADT_DUMMY; + + close(fd); + + return ret; +} + +static void NORETURN list_i2c_busses_and_exit(void) +{ + static const char *const i2cdev_path = "/sys/class/i2c-dev"; + + char path[NAME_MAX], name[128]; + struct dirent *de, *subde; + enum adapter_type adt; + DIR *dir, *subdir; + int rv, bus; + char *pos; + FILE *fd; + + /* + * XXX Upstream i2cdetect also looks for i2c bus info in /proc/bus/i2c, + * but we won't bother since it's only useful on older kernels (before + * 2.6.5). We expect sysfs to be present and mounted at /sys/. + */ + + dir = xopendir(i2cdev_path); + while ((de = readdir(dir))) { + if (de->d_name[0] == '.') + continue; + + /* Simple version for ISA chips. */ + snprintf(path, NAME_MAX, "%s/%s/name", + i2cdev_path, de->d_name); + fd = fopen(path, "r"); + if (fd == NULL) { + snprintf(path, NAME_MAX, + "%s/%s/device/name", + i2cdev_path, de->d_name); + fd = fopen(path, "r"); + } + + /* Non-ISA chips require the hard-way. */ + if (fd == NULL) { + snprintf(path, NAME_MAX, + "%s/%s/device/name", + i2cdev_path, de->d_name); + subdir = opendir(path); + if (subdir == NULL) + continue; + + while ((subde = readdir(subdir))) { + if (subde->d_name[0] == '.') + continue; + + if (strncmp(subde->d_name, "i2c-", 4) == 0) { + snprintf(path, NAME_MAX, + "%s/%s/device/%s/name", + i2cdev_path, de->d_name, + subde->d_name); + fd = fopen(path, "r"); + goto found; + } + } + } + +found: + if (fd != NULL) { + /* + * Get the rest of the info and display a line + * for a single bus. + */ + memset(name, 0, sizeof(name)); + pos = fgets(name, sizeof(name), fd); + fclose(fd); + if (pos == NULL) + continue; + + pos = strchr(name, '\n'); + if (pos != NULL) + *pos = '\0'; + + rv = sscanf(de->d_name, "i2c-%d", &bus); + if (rv != 1) + continue; + + if (strncmp(name, "ISA", 3) == 0) + adt = ADT_ISA; + else + adt = i2cdetect_get_funcs(bus); + + fprintf(stdout, + "i2c-%d\t%-10s\t%-32s\t%s\n", + bus, adap_descs[adt].funcs, + name, adap_descs[adt].algo); + } + } + + exit(EXIT_SUCCESS); +} + +static void NORETURN no_support(const char *cmd) +{ + bb_error_msg_and_die("Bus doesn't support %s", cmd); +} + +static void will_skip(const char *cmd) +{ + fprintf(stderr, + "Warning: Can't use %s command, " + "will skip some addresses\n", cmd); +} + +int i2cdetect_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int i2cdetect_main(int argc, char **argv) +{ + static const unsigned opt_y = (1 << 0), opt_a = (1 << 1), + opt_q = (1 << 2), opt_r = (1 << 3), + opt_F = (1 << 4), opt_l = (1 << 5); + static const char *const optstr = "yaqrFl"; + + int fd, bus_num, i, j, mode = DETECT_MODE_AUTO; + int first = 0x00, last = 0x77, status; + unsigned long funcs; + unsigned opts; + + opt_complementary = "q--r:r--q"; /* mutually exclusive */ + opts = getopt32(argv, optstr); + argv += optind; + argc -= optind; + + if (opts & opt_l) + list_i2c_busses_and_exit(); + + if (argc < 1) + bb_show_usage(); + + bus_num = i2c_bus_lookup(argv[0]); + fd = i2c_dev_open(bus_num); + get_funcs_matrix(fd, &funcs); + + if (opts & opt_F) { + /* Only list the functionalities. */ + printf("Functionalities implemented by bus #%d\n", bus_num); + for (i = 0; i2c_funcs_tab[i].value; i++) { + printf("%-32s %s\n", i2c_funcs_tab[i].name, + funcs & i2c_funcs_tab[i].value ? "yes" : "no"); + } + + exit(EXIT_SUCCESS); + } + + if (opts & opt_r) + mode = DETECT_MODE_READ; + else if (opts & opt_q) + mode = DETECT_MODE_QUICK; + + if (opts & opt_a) + last = 0x7f; + + /* Read address range. */ + if (argc > 1) + first = xstrtoi_range(argv[1], 16, first, last); + if (argc > 2) + last = xstrtoi_range(argv[2], 16, first, last); + + if (!(funcs & (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_READ_BYTE))) { + no_support("detection commands"); + } else if (mode == DETECT_MODE_QUICK && + !(funcs & I2C_FUNC_SMBUS_QUICK)) { + no_support("SMBus Quick Write command"); + } else if (mode == DETECT_MODE_READ && + !(funcs & I2C_FUNC_SMBUS_READ_BYTE)) { + no_support("SMBus Receive Byte command"); + } else { + if (!(funcs & I2C_FUNC_SMBUS_QUICK)) + will_skip("SMBus Quick Write"); + if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) + will_skip("SMBus Receive Byte"); + } + + if (!(opts & opt_y)) + confirm_action(-1, -1, -1, 0); + + printf(" 0 1 2 3 4 5 6 7 8 9 a b c d e f\n"); + for (i = 0; i < 128; i += 16) { + printf("%02x: ", i); + for(j = 0; j < 16; j++) { + fflush(stdout); + + if (mode == DETECT_MODE_AUTO) { + if ((i+j >= 0x30 && i+j <= 0x37) || + (i+j >= 0x50 && i+j <= 0x5F)) + mode = DETECT_MODE_READ; + else + mode = DETECT_MODE_QUICK; + } + + /* Skip unwanted addresses. */ + if (i+j < first || i+j > last || + (mode == DETECT_MODE_READ && + !(funcs & I2C_FUNC_SMBUS_READ_BYTE)) || + (mode == DETECT_MODE_QUICK && + !(funcs & I2C_FUNC_SMBUS_QUICK))) { + printf(" "); + continue; + } + + i2c_set_slave_addr(fd, i + j, 0); + + switch (mode) { + case DETECT_MODE_READ: + /* + * This is known to lock SMBus on various + * write-only chips (mainly clock chips). + */ + status = i2c_smbus_read_byte(fd); + break; + default: /* DETECT_MODE_QUICK: */ + /* + * This is known to corrupt the Atmel + * AT24RF08 EEPROM. + */ + status = i2c_smbus_write_quick(fd, + I2C_SMBUS_WRITE); + break; + } + + if (status < 0) + printf("-- "); + else + printf("%02x ", i+j); + } + printf("\n"); + } + + return 0; +} +#endif /* ENABLE_I2CDETECT */ -- 2.1.4 _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
