| /* 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 (5.5 kb)" |
| //config: default y |
| //config: help |
| //config: Read from I2C/SMBus chip registers. |
| //config: |
| //config:config I2CSET |
| //config: bool "i2cset (6.7 kb)" |
| //config: default y |
| //config: help |
| //config: Set I2C registers. |
| //config: |
| //config:config I2CDUMP |
| //config: bool "i2cdump (7.1 kb)" |
| //config: default y |
| //config: help |
| //config: Examine I2C registers. |
| //config: |
| //config:config I2CDETECT |
| //config: bool "i2cdetect (7.1 kb)" |
| //config: default y |
| //config: help |
| //config: Detect I2C chips. |
| //config: |
| //config:config I2CTRANSFER |
| //config: bool "i2ctransfer (4.0 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; |
| } |
| |
| 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; |
| } |
| |
| #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 || ENABLE_I2CTRANSFER |
| 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"); |
| } |
| |
| 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 /* 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 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) { |
| 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_simple_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) { |
| int blen = 0; |
| |
| if (mode == I2C_SMBUS_BLOCK_DATA || mode == I2C_SMBUS_I2C_BLOCK_DATA) |
| blen = read_block_data(fd, mode, block); |
| |
| if (mode == I2C_SMBUS_BYTE) { |
| res = i2c_smbus_write_byte(fd, first); |
| if (res < 0) |
| bb_simple_perror_msg_and_die("write start address"); |
| } |
| |
| dump_data(fd, mode, first, last, block, blen); |
| } else { |
| dump_word_data(fd, first, last); |
| } |
| |
| 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) |
| { |
| 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 *fp; |
| |
| /* |
| * 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); |
| fp = fopen(path, "r"); |
| if (fp == NULL) { |
| snprintf(path, NAME_MAX, |
| "%s/%s/device/name", |
| i2cdev_path, de->d_name); |
| fp = fopen(path, "r"); |
| } |
| |
| /* Non-ISA chips require the hard-way. */ |
| if (fp == 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 (is_prefixed_with(subde->d_name, "i2c-")) { |
| snprintf(path, NAME_MAX, |
| "%s/%s/device/%s/name", |
| i2cdev_path, de->d_name, |
| subde->d_name); |
| fp = fopen(path, "r"); |
| break; |
| } |
| } |
| } |
| |
| if (fp != 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), fp); |
| fclose(fp); |
| 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 (is_prefixed_with(name, "ISA")) |
| adt = ADT_ISA; |
| else |
| adt = i2cdetect_get_funcs(bus); |
| |
| printf( |
| "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) |
| { |
| bb_error_msg( |
| "warning: can't use %s command, " |
| "will skip some addresses", cmd); |
| } |
| |
| //usage:#define i2cdetect_trivial_usage |
| //usage: "-l | -F I2CBUS | [-ya] [-q|-r] I2CBUS [FIRST LAST]" |
| //usage:#define i2cdetect_full_usage "\n\n" |
| //usage: "Detect I2C chips" |
| //usage: "\n" |
| //usage: "\n -l List installed buses" |
| //usage: "\n -F BUS# List functionalities on this bus" |
| //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 FIRST and LAST limit probing range" |
| int i2cdetect_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int i2cdetect_main(int argc UNUSED_PARAM, char **argv) |
| { |
| 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); |
| |
| int fd, bus_num, i, j, mode = I2CDETECT_MODE_AUTO, status, cmd; |
| unsigned first = 0x03, last = 0x77, opts; |
| unsigned long funcs; |
| |
| opts = getopt32(argv, "^" |
| "yaqrFl" |
| "\0" |
| "q--r:r--q:"/*mutually exclusive*/ |
| "?3"/*up to 3 args*/ |
| ); |
| argv += optind; |
| |
| if (opts & opt_l) |
| list_i2c_busses_and_exit(); |
| |
| if (!argv[0]) |
| 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"); |
| } |
| |
| return EXIT_SUCCESS; |
| } |
| |
| if (opts & opt_r) |
| mode = I2CDETECT_MODE_READ; |
| else if (opts & opt_q) |
| mode = I2CDETECT_MODE_QUICK; |
| |
| if (opts & opt_a) { |
| first = 0x00; |
| last = 0x7f; |
| } |
| |
| /* Read address range. */ |
| if (argv[1]) { |
| first = xstrtou_range(argv[1], 16, first, last); |
| if (argv[2]) |
| last = xstrtou_range(argv[2], 16, first, last); |
| } |
| |
| if (!(funcs & (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_READ_BYTE))) { |
| no_support("detection commands"); |
| } else |
| if (mode == I2CDETECT_MODE_QUICK && !(funcs & I2C_FUNC_SMBUS_QUICK)) { |
| no_support("SMBus quick write"); |
| } else |
| if (mode == I2CDETECT_MODE_READ && !(funcs & I2C_FUNC_SMBUS_READ_BYTE)) { |
| no_support("SMBus receive byte"); |
| } |
| |
| if (mode == I2CDETECT_MODE_AUTO) { |
| 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); |
| |
| puts(" 0 1 2 3 4 5 6 7 8 9 a b c d e f"); |
| for (i = 0; i < 128; i += 16) { |
| printf("%02x: ", i); |
| for (j = 0; j < 16; j++) { |
| fflush_all(); |
| |
| cmd = mode; |
| if (mode == I2CDETECT_MODE_AUTO) { |
| if ((i+j >= 0x30 && i+j <= 0x37) || |
| (i+j >= 0x50 && i+j <= 0x5F)) |
| cmd = I2CDETECT_MODE_READ; |
| else |
| cmd = I2CDETECT_MODE_QUICK; |
| } |
| |
| /* Skip unwanted addresses. */ |
| if (i+j < first |
| || i+j > last |
| || (cmd == I2CDETECT_MODE_READ && !(funcs & I2C_FUNC_SMBUS_READ_BYTE)) |
| || (cmd == I2CDETECT_MODE_QUICK && !(funcs & I2C_FUNC_SMBUS_QUICK))) |
| { |
| printf(" "); |
| continue; |
| } |
| |
| status = ioctl(fd, I2C_SLAVE, itoptr(i + j)); |
| if (status < 0) { |
| if (errno == EBUSY) { |
| printf("UU "); |
| continue; |
| } |
| |
| bb_perror_msg_and_die( |
| "can't set address to 0x%02x", i + j); |
| } |
| |
| switch (cmd) { |
| case I2CDETECT_MODE_READ: |
| /* |
| * This is known to lock SMBus on various |
| * write-only chips (mainly clock chips). |
| */ |
| status = i2c_smbus_read_byte(fd); |
| break; |
| default: /* I2CDETECT_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); |
| } |
| bb_putchar('\n'); |
| } |
| |
| return 0; |
| } |
| #endif /* ENABLE_I2CDETECT */ |
| |
| #if ENABLE_I2CTRANSFER |
| static void check_i2c_func(int fd) |
| { |
| unsigned long funcs; |
| |
| get_funcs_matrix(fd, &funcs); |
| |
| if (!(funcs & I2C_FUNC_I2C)) |
| bb_simple_error_msg_and_die("adapter does not support I2C transfers"); |
| } |
| |
| //usage:#define i2ctransfer_trivial_usage |
| //usage: "[-fay] I2CBUS {rLENGTH[@ADDR] | wLENGTH[@ADDR] DATA...}..." |
| //usage:#define i2ctransfer_full_usage "\n\n" |
| //usage: "Read/write I2C data in one transfer" |
| //usage: "\n" |
| //usage: "\n -f Force access to busy addresses" |
| //usage: "\n -a Force access to non-regular addresses" |
| //usage: "\n -y Disable interactive mode" |
| int i2ctransfer_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int i2ctransfer_main(int argc UNUSED_PARAM, char **argv) |
| { |
| enum { |
| opt_f = (1 << 0), |
| opt_y = (1 << 1), |
| opt_a = (1 << 2), |
| }; |
| int bus_num, bus_addr; |
| int fd; |
| unsigned opts, first, last; |
| int nmsgs, nmsgs_sent, i; |
| struct i2c_msg msgs[I2C_RDWR_IOCTL_MAX_MSGS]; |
| struct i2c_rdwr_ioctl_data rdwr; |
| |
| memset(msgs, 0, sizeof(msgs)); |
| |
| opts = getopt32(argv, "^" |
| "fya" |
| "\0" "-2" /* minimum 2 args */ |
| ); |
| first = 0x03; |
| last = 0x77; |
| if (opts & opt_a) { |
| first = 0x00; |
| last = 0x7f; |
| } |
| |
| argv += optind; |
| bus_num = i2c_bus_lookup(argv[0]); |
| fd = i2c_dev_open(bus_num); |
| check_i2c_func(fd); |
| |
| bus_addr = -1; |
| nmsgs = 0; |
| while (*++argv) { |
| char *arg_ptr; |
| unsigned len; |
| uint16_t flags; |
| char *end; |
| |
| if (nmsgs >= I2C_RDWR_IOCTL_MAX_MSGS) |
| bb_simple_error_msg_and_die("too many messages, max: "I2C_RDWR_IOCTL_MAX_MSGS_STR); |
| |
| flags = 0; |
| arg_ptr = *argv; |
| switch (*arg_ptr++) { |
| case 'r': flags |= I2C_M_RD; break; |
| case 'w': break; |
| default: |
| bb_show_usage(); |
| } |
| |
| end = strchr(arg_ptr, '@'); |
| if (end) *end = '\0'; |
| len = xstrtou_range(arg_ptr, 0, 0, 0xffff); |
| if (end) { |
| bus_addr = xstrtou_range(end + 1, 0, first, last); |
| i2c_set_slave_addr(fd, bus_addr, (opts & opt_f)); |
| } else { |
| /* Reuse last address if possible */ |
| if (bus_addr < 0) |
| bb_error_msg_and_die("no address given in '%s'", *argv); |
| } |
| |
| msgs[nmsgs].addr = bus_addr; |
| msgs[nmsgs].flags = flags; |
| msgs[nmsgs].len = len; |
| if (len) |
| msgs[nmsgs].buf = xzalloc(len); |
| |
| if (!(flags & I2C_M_RD)) { |
| /* Consume DATA arg(s) */ |
| unsigned buf_idx = 0; |
| |
| while (buf_idx < len) { |
| uint8_t data8; |
| unsigned long data; |
| |
| arg_ptr = *++argv; |
| if (!arg_ptr) |
| bb_show_usage(); |
| data = strtoul(arg_ptr, &end, 0); |
| if (data > 0xff || arg_ptr == end) |
| bb_error_msg_and_die("invalid data byte '%s'", *argv); |
| |
| data8 = data; |
| while (buf_idx < len) { |
| msgs[nmsgs].buf[buf_idx++] = data8; |
| if (!*end) |
| break; |
| switch (*end) { |
| /* Pseudo randomness (8 bit AXR with a=13 and b=27) */ |
| case 'p': |
| data8 = (data8 ^ 27) + 13; |
| data8 = (data8 << 1) | (data8 >> 7); |
| break; |
| case '+': data8++; break; |
| case '-': data8--; break; |
| case '=': break; |
| default: |
| bb_error_msg_and_die("invalid data byte suffix: '%s'", |
| *argv); |
| } |
| } |
| } |
| } |
| nmsgs++; |
| } |
| |
| if (!(opts & opt_y)) |
| confirm_action(bus_addr, 0, 0, 0); |
| |
| rdwr.msgs = msgs; |
| rdwr.nmsgs = nmsgs; |
| nmsgs_sent = ioctl_or_perror_and_die(fd, I2C_RDWR, &rdwr, "I2C_RDWR"); |
| if (nmsgs_sent < nmsgs) |
| bb_error_msg("warning: only %u/%u messages sent", nmsgs_sent, nmsgs); |
| |
| for (i = 0; i < nmsgs_sent; i++) { |
| if (msgs[i].len != 0 && (msgs[i].flags & I2C_M_RD)) { |
| int j; |
| for (j = 0; j < msgs[i].len - 1; j++) |
| printf("0x%02x ", msgs[i].buf[j]); |
| /* Print final byte with newline */ |
| printf("0x%02x\n", msgs[i].buf[j]); |
| } |
| } |
| |
| # if ENABLE_FEATURE_CLEAN_UP |
| close(fd); |
| for (i = 0; i < nmsgs; i++) |
| free(msgs[i].buf); |
| # endif |
| |
| return 0; |
| } |
| #endif /* ENABLE_I2CTRANSFER */ |