Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Minimal i2c-tools implementation for busybox. |
| 4 | * Parts of code ported from i2c-tools: |
| 5 | * http://www.lm-sensors.org/wiki/I2CTools. |
| 6 | * |
| 7 | * Copyright (C) 2014 by Bartosz Golaszewski <bartekgola@gmail.com> |
| 8 | * |
| 9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 10 | */ |
| 11 | |
| 12 | //config:config I2CGET |
| 13 | //config: bool "i2cget" |
| 14 | //config: default y |
| 15 | //config: select PLATFORM_LINUX |
| 16 | //config: help |
| 17 | //config: Read from I2C/SMBus chip registers. |
| 18 | //config: |
| 19 | //config:config I2CSET |
| 20 | //config: bool "i2cset" |
| 21 | //config: default y |
| 22 | //config: select PLATFORM_LINUX |
| 23 | //config: help |
| 24 | //config: Set I2C registers. |
| 25 | //config: |
| 26 | //config:config I2CDUMP |
| 27 | //config: bool "i2cdump" |
| 28 | //config: default y |
| 29 | //config: select PLATFORM_LINUX |
| 30 | //config: help |
| 31 | //config: Examine I2C registers. |
| 32 | //config: |
| 33 | //config:config I2CDETECT |
| 34 | //config: bool "i2cdetect" |
| 35 | //config: default y |
| 36 | //config: select PLATFORM_LINUX |
| 37 | //config: help |
| 38 | //config: Detect I2C chips. |
| 39 | //config: |
| 40 | |
| 41 | //applet:IF_I2CGET(APPLET(i2cget, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| 42 | //applet:IF_I2CSET(APPLET(i2cset, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| 43 | //applet:IF_I2CDUMP(APPLET(i2cdump, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| 44 | //applet:IF_I2CDETECT(APPLET(i2cdetect, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| 45 | |
| 46 | //kbuild:lib-$(CONFIG_I2CGET) += i2c_tools.o |
| 47 | //kbuild:lib-$(CONFIG_I2CSET) += i2c_tools.o |
| 48 | //kbuild:lib-$(CONFIG_I2CDUMP) += i2c_tools.o |
| 49 | //kbuild:lib-$(CONFIG_I2CDETECT) += i2c_tools.o |
| 50 | |
| 51 | /* |
| 52 | * Unsupported stuff: |
| 53 | * |
| 54 | * - upstream i2c-tools can also look-up i2c busses by name, we only accept |
| 55 | * numbers, |
| 56 | * - bank and bankreg parameters for i2cdump are not supported because of |
| 57 | * their limited usefulness (see i2cdump manual entry for more info), |
| 58 | * - i2cdetect doesn't look for bus info in /proc as it does in upstream, but |
| 59 | * it shouldn't be a problem in modern kernels. |
| 60 | */ |
| 61 | |
| 62 | #include "libbb.h" |
| 63 | |
Bartosz Golaszewski | d9892fa | 2015-09-04 10:35:22 +0200 | [diff] [blame] | 64 | #include <linux/i2c.h> |
| 65 | #include <linux/i2c-dev.h> |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 66 | |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 67 | #define I2CDUMP_NUM_REGS 256 |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 68 | |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 69 | #define I2CDETECT_MODE_AUTO 0 |
| 70 | #define I2CDETECT_MODE_QUICK 1 |
| 71 | #define I2CDETECT_MODE_READ 2 |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 72 | |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 73 | /* |
| 74 | * This is needed for ioctl_or_perror_and_die() since it only accepts pointers. |
| 75 | */ |
| 76 | static ALWAYS_INLINE void *itoptr(int i) |
| 77 | { |
| 78 | return (void*)(intptr_t)i; |
| 79 | } |
| 80 | |
| 81 | static int32_t i2c_smbus_access(int fd, char read_write, uint8_t cmd, |
| 82 | int size, union i2c_smbus_data *data) |
| 83 | { |
| 84 | struct i2c_smbus_ioctl_data args; |
| 85 | |
| 86 | args.read_write = read_write; |
| 87 | args.command = cmd; |
| 88 | args.size = size; |
| 89 | args.data = data; |
| 90 | |
| 91 | return ioctl(fd, I2C_SMBUS, &args); |
| 92 | } |
| 93 | |
| 94 | static int32_t i2c_smbus_read_byte(int fd) |
| 95 | { |
| 96 | union i2c_smbus_data data; |
| 97 | int err; |
| 98 | |
| 99 | err = i2c_smbus_access(fd, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data); |
| 100 | if (err < 0) |
| 101 | return err; |
| 102 | |
| 103 | return data.byte; |
| 104 | } |
| 105 | |
| 106 | #if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP |
| 107 | static int32_t i2c_smbus_write_byte(int fd, uint8_t val) |
| 108 | { |
| 109 | return i2c_smbus_access(fd, I2C_SMBUS_WRITE, |
| 110 | val, I2C_SMBUS_BYTE, NULL); |
| 111 | } |
| 112 | |
| 113 | static int32_t i2c_smbus_read_byte_data(int fd, uint8_t cmd) |
| 114 | { |
| 115 | union i2c_smbus_data data; |
| 116 | int err; |
| 117 | |
| 118 | err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd, |
| 119 | I2C_SMBUS_BYTE_DATA, &data); |
| 120 | if (err < 0) |
| 121 | return err; |
| 122 | |
| 123 | return data.byte; |
| 124 | } |
| 125 | |
| 126 | static int32_t i2c_smbus_read_word_data(int fd, uint8_t cmd) |
| 127 | { |
| 128 | union i2c_smbus_data data; |
| 129 | int err; |
| 130 | |
| 131 | err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd, |
| 132 | I2C_SMBUS_WORD_DATA, &data); |
| 133 | if (err < 0) |
| 134 | return err; |
| 135 | |
| 136 | return data.word; |
| 137 | } |
| 138 | #endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */ |
| 139 | |
| 140 | #if ENABLE_I2CSET |
| 141 | static int32_t i2c_smbus_write_byte_data(int file, |
| 142 | uint8_t cmd, uint8_t value) |
| 143 | { |
| 144 | union i2c_smbus_data data; |
| 145 | |
| 146 | data.byte = value; |
| 147 | |
| 148 | return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd, |
| 149 | I2C_SMBUS_BYTE_DATA, &data); |
| 150 | } |
| 151 | |
| 152 | static int32_t i2c_smbus_write_word_data(int file, uint8_t cmd, uint16_t value) |
| 153 | { |
| 154 | union i2c_smbus_data data; |
| 155 | |
| 156 | data.word = value; |
| 157 | |
| 158 | return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd, |
| 159 | I2C_SMBUS_WORD_DATA, &data); |
| 160 | } |
| 161 | |
| 162 | static int32_t i2c_smbus_write_block_data(int file, uint8_t cmd, |
| 163 | uint8_t length, const uint8_t *values) |
| 164 | { |
| 165 | union i2c_smbus_data data; |
| 166 | |
| 167 | if (length > I2C_SMBUS_BLOCK_MAX) |
| 168 | length = I2C_SMBUS_BLOCK_MAX; |
| 169 | |
| 170 | memcpy(data.block+1, values, length); |
| 171 | data.block[0] = length; |
| 172 | |
| 173 | return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd, |
| 174 | I2C_SMBUS_BLOCK_DATA, &data); |
| 175 | } |
| 176 | |
| 177 | static int32_t i2c_smbus_write_i2c_block_data(int file, uint8_t cmd, |
| 178 | uint8_t length, const uint8_t *values) |
| 179 | { |
| 180 | union i2c_smbus_data data; |
| 181 | |
| 182 | if (length > I2C_SMBUS_BLOCK_MAX) |
| 183 | length = I2C_SMBUS_BLOCK_MAX; |
| 184 | |
| 185 | memcpy(data.block+1, values, length); |
| 186 | data.block[0] = length; |
| 187 | |
| 188 | return i2c_smbus_access(file, I2C_SMBUS_WRITE, cmd, |
| 189 | I2C_SMBUS_I2C_BLOCK_BROKEN, &data); |
| 190 | } |
| 191 | #endif /* ENABLE_I2CSET */ |
| 192 | |
| 193 | #if ENABLE_I2CDUMP |
| 194 | /* |
| 195 | * Returns the number of bytes read, vals must hold at |
| 196 | * least I2C_SMBUS_BLOCK_MAX bytes. |
| 197 | */ |
| 198 | static int32_t i2c_smbus_read_block_data(int fd, uint8_t cmd, uint8_t *vals) |
| 199 | { |
| 200 | union i2c_smbus_data data; |
| 201 | int i, err; |
| 202 | |
| 203 | err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd, |
| 204 | I2C_SMBUS_BLOCK_DATA, &data); |
| 205 | if (err < 0) |
| 206 | return err; |
| 207 | |
| 208 | for (i = 1; i <= data.block[0]; i++) |
| 209 | *vals++ = data.block[i]; |
| 210 | return data.block[0]; |
| 211 | } |
| 212 | |
| 213 | static int32_t i2c_smbus_read_i2c_block_data(int fd, uint8_t cmd, |
| 214 | uint8_t len, uint8_t *vals) |
| 215 | { |
| 216 | union i2c_smbus_data data; |
| 217 | int i, err; |
| 218 | |
| 219 | if (len > I2C_SMBUS_BLOCK_MAX) |
| 220 | len = I2C_SMBUS_BLOCK_MAX; |
| 221 | data.block[0] = len; |
| 222 | |
| 223 | err = i2c_smbus_access(fd, I2C_SMBUS_READ, cmd, |
| 224 | len == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN : |
| 225 | I2C_SMBUS_I2C_BLOCK_DATA, &data); |
| 226 | if (err < 0) |
| 227 | return err; |
| 228 | |
| 229 | for (i = 1; i <= data.block[0]; i++) |
| 230 | *vals++ = data.block[i]; |
| 231 | return data.block[0]; |
| 232 | } |
| 233 | #endif /* ENABLE_I2CDUMP */ |
| 234 | |
| 235 | #if ENABLE_I2CDETECT |
| 236 | static int32_t i2c_smbus_write_quick(int fd, uint8_t val) |
| 237 | { |
| 238 | return i2c_smbus_access(fd, val, 0, I2C_SMBUS_QUICK, NULL); |
| 239 | } |
| 240 | #endif /* ENABLE_I2CDETECT */ |
| 241 | |
| 242 | static int i2c_bus_lookup(const char *bus_str) |
| 243 | { |
| 244 | return xstrtou_range(bus_str, 10, 0, 0xfffff); |
| 245 | } |
| 246 | |
| 247 | #if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP |
| 248 | static int i2c_parse_bus_addr(const char *addr_str) |
| 249 | { |
| 250 | /* Slave address must be in range 0x03 - 0x77. */ |
| 251 | return xstrtou_range(addr_str, 16, 0x03, 0x77); |
| 252 | } |
| 253 | |
| 254 | static void i2c_set_pec(int fd, int pec) |
| 255 | { |
| 256 | ioctl_or_perror_and_die(fd, I2C_PEC, |
| 257 | itoptr(pec ? 1 : 0), |
| 258 | "can't set PEC"); |
| 259 | } |
Bartosz Golaszewski | 3147427 | 2015-06-05 10:27:28 +0200 | [diff] [blame] | 260 | |
| 261 | static void i2c_set_slave_addr(int fd, int addr, int force) |
| 262 | { |
| 263 | ioctl_or_perror_and_die(fd, force ? I2C_SLAVE_FORCE : I2C_SLAVE, |
| 264 | itoptr(addr), |
| 265 | "can't set address to 0x%02x", addr); |
| 266 | } |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 267 | #endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */ |
| 268 | |
| 269 | #if ENABLE_I2CGET || ENABLE_I2CSET |
| 270 | static int i2c_parse_data_addr(const char *data_addr) |
| 271 | { |
| 272 | /* Data address must be an 8 bit integer. */ |
| 273 | return xstrtou_range(data_addr, 16, 0, 0xff); |
| 274 | } |
| 275 | #endif /* ENABLE_I2CGET || ENABLE_I2CSET */ |
| 276 | |
| 277 | /* |
| 278 | * Opens the device file associated with given i2c bus. |
| 279 | * |
| 280 | * Upstream i2c-tools also support opening devices by i2c bus name |
| 281 | * but we drop it here for size reduction. |
| 282 | */ |
| 283 | static int i2c_dev_open(int i2cbus) |
| 284 | { |
| 285 | char filename[sizeof("/dev/i2c-%d") + sizeof(int)*3]; |
| 286 | int fd; |
| 287 | |
| 288 | sprintf(filename, "/dev/i2c-%d", i2cbus); |
| 289 | fd = open(filename, O_RDWR); |
| 290 | if (fd < 0) { |
Bartosz Golaszewski | 7ca5c51 | 2015-05-11 17:26:27 +0200 | [diff] [blame] | 291 | if (errno == ENOENT) { |
| 292 | filename[8] = '/'; /* change to "/dev/i2c/%d" */ |
| 293 | fd = xopen(filename, O_RDWR); |
| 294 | } else { |
| 295 | bb_perror_msg_and_die("can't open '%s'", filename); |
| 296 | } |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | return fd; |
| 300 | } |
| 301 | |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 302 | /* Size reducing helpers for xxx_check_funcs(). */ |
| 303 | static void get_funcs_matrix(int fd, unsigned long *funcs) |
| 304 | { |
| 305 | ioctl_or_perror_and_die(fd, I2C_FUNCS, funcs, |
| 306 | "can't get adapter functionality matrix"); |
| 307 | } |
| 308 | |
| 309 | #if ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP |
| 310 | static void check_funcs_test_end(int funcs, int pec, const char *err) |
| 311 | { |
| 312 | if (pec && !(funcs & (I2C_FUNC_SMBUS_PEC | I2C_FUNC_I2C))) |
| 313 | bb_error_msg("warning: adapter does not support PEC"); |
| 314 | |
| 315 | if (err) |
| 316 | bb_error_msg_and_die( |
| 317 | "adapter has no %s capability", err); |
| 318 | } |
| 319 | #endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */ |
| 320 | |
| 321 | /* |
| 322 | * The below functions emit an error message and exit if the adapter doesn't |
| 323 | * support desired functionalities. |
| 324 | */ |
| 325 | #if ENABLE_I2CGET || ENABLE_I2CDUMP |
| 326 | static void check_read_funcs(int fd, int mode, int data_addr, int pec) |
| 327 | { |
| 328 | unsigned long funcs; |
| 329 | const char *err = NULL; |
| 330 | |
| 331 | get_funcs_matrix(fd, &funcs); |
| 332 | switch (mode) { |
| 333 | case I2C_SMBUS_BYTE: |
| 334 | if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) { |
| 335 | err = "SMBus receive byte"; |
| 336 | break; |
| 337 | } |
| 338 | if (data_addr >= 0 && !(funcs & I2C_FUNC_SMBUS_WRITE_BYTE)) |
| 339 | err = "SMBus send byte"; |
| 340 | break; |
| 341 | case I2C_SMBUS_BYTE_DATA: |
| 342 | if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE_DATA)) |
| 343 | err = "SMBus read byte"; |
| 344 | break; |
| 345 | case I2C_SMBUS_WORD_DATA: |
| 346 | if (!(funcs & I2C_FUNC_SMBUS_READ_WORD_DATA)) |
| 347 | err = "SMBus read word"; |
| 348 | break; |
| 349 | #if ENABLE_I2CDUMP |
| 350 | case I2C_SMBUS_BLOCK_DATA: |
| 351 | if (!(funcs & I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
| 352 | err = "SMBus block read"; |
| 353 | break; |
| 354 | |
| 355 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 356 | if (!(funcs & I2C_FUNC_SMBUS_READ_I2C_BLOCK)) |
| 357 | err = "I2C block read"; |
| 358 | break; |
| 359 | #endif /* ENABLE_I2CDUMP */ |
| 360 | default: |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 361 | bb_error_msg_and_die("internal error"); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 362 | } |
| 363 | check_funcs_test_end(funcs, pec, err); |
| 364 | } |
| 365 | #endif /* ENABLE_I2CGET || ENABLE_I2CDUMP */ |
| 366 | |
| 367 | #if ENABLE_I2CSET |
| 368 | static void check_write_funcs(int fd, int mode, int pec) |
| 369 | { |
| 370 | unsigned long funcs; |
| 371 | const char *err = NULL; |
| 372 | |
| 373 | get_funcs_matrix(fd, &funcs); |
| 374 | switch (mode) { |
| 375 | case I2C_SMBUS_BYTE: |
| 376 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE)) |
| 377 | err = "SMBus send byte"; |
| 378 | break; |
| 379 | |
| 380 | case I2C_SMBUS_BYTE_DATA: |
| 381 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) |
| 382 | err = "SMBus write byte"; |
| 383 | break; |
| 384 | |
| 385 | case I2C_SMBUS_WORD_DATA: |
| 386 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_WORD_DATA)) |
| 387 | err = "SMBus write word"; |
| 388 | break; |
| 389 | |
| 390 | case I2C_SMBUS_BLOCK_DATA: |
| 391 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) |
| 392 | err = "SMBus block write"; |
| 393 | break; |
| 394 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 395 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) |
| 396 | err = "I2C block write"; |
| 397 | break; |
| 398 | } |
| 399 | check_funcs_test_end(funcs, pec, err); |
| 400 | } |
| 401 | #endif /* ENABLE_I2CSET */ |
| 402 | |
| 403 | static void confirm_or_abort(void) |
| 404 | { |
| 405 | fprintf(stderr, "Continue? [y/N] "); |
| 406 | fflush_all(); |
| 407 | if (!bb_ask_confirmation()) |
| 408 | bb_error_msg_and_die("aborting"); |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * Return only if user confirms the action, abort otherwise. |
| 413 | * |
| 414 | * The messages displayed here are much less elaborate than their i2c-tools |
| 415 | * counterparts - this is done for size reduction. |
| 416 | */ |
| 417 | static void confirm_action(int bus_addr, int mode, int data_addr, int pec) |
| 418 | { |
| 419 | bb_error_msg("WARNING! This program can confuse your I2C bus"); |
| 420 | |
| 421 | /* Don't let the user break his/her EEPROMs */ |
| 422 | if (bus_addr >= 0x50 && bus_addr <= 0x57 && pec) { |
| 423 | bb_error_msg_and_die("this is I2C not smbus - using PEC on I2C " |
| 424 | "devices may result in data loss, aborting"); |
| 425 | } |
| 426 | |
| 427 | if (mode == I2C_SMBUS_BYTE && data_addr >= 0 && pec) |
| 428 | bb_error_msg("WARNING! May interpret a write byte command " |
| 429 | "with PEC as a write byte data command"); |
| 430 | |
| 431 | if (pec) |
| 432 | bb_error_msg("PEC checking enabled"); |
| 433 | |
| 434 | confirm_or_abort(); |
| 435 | } |
| 436 | |
| 437 | #if ENABLE_I2CGET |
| 438 | //usage:#define i2cget_trivial_usage |
| 439 | //usage: "[-f] [-y] BUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]" |
| 440 | //usage:#define i2cget_full_usage "\n\n" |
| 441 | //usage: "Read from I2C/SMBus chip registers\n" |
| 442 | //usage: "\n I2CBUS i2c bus number" |
| 443 | //usage: "\n ADDRESS 0x03 - 0x77" |
| 444 | //usage: "\nMODE is:" |
| 445 | //usage: "\n b read byte data (default)" |
| 446 | //usage: "\n w read word data" |
| 447 | //usage: "\n c write byte/read byte" |
| 448 | //usage: "\n Append p for SMBus PEC" |
| 449 | //usage: "\n" |
| 450 | //usage: "\n -f force access" |
| 451 | //usage: "\n -y disable interactive mode" |
| 452 | int i2cget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 453 | int i2cget_main(int argc UNUSED_PARAM, char **argv) |
| 454 | { |
| 455 | const unsigned opt_f = (1 << 0), opt_y = (1 << 1); |
| 456 | const char *const optstr = "fy"; |
| 457 | |
| 458 | int bus_num, bus_addr, data_addr = -1, status; |
| 459 | int mode = I2C_SMBUS_BYTE, pec = 0, fd; |
| 460 | unsigned opts; |
| 461 | |
| 462 | opt_complementary = "-2:?4"; /* from 2 to 4 args */ |
| 463 | opts = getopt32(argv, optstr); |
| 464 | argv += optind; |
| 465 | |
| 466 | bus_num = i2c_bus_lookup(argv[0]); |
| 467 | bus_addr = i2c_parse_bus_addr(argv[1]); |
| 468 | |
| 469 | if (argv[2]) { |
| 470 | data_addr = i2c_parse_data_addr(argv[2]); |
| 471 | mode = I2C_SMBUS_BYTE_DATA; |
| 472 | if (argv[3]) { |
| 473 | switch (argv[3][0]) { |
| 474 | case 'b': /* Already set */ break; |
| 475 | case 'w': mode = I2C_SMBUS_WORD_DATA; break; |
| 476 | case 'c': mode = I2C_SMBUS_BYTE; break; |
| 477 | default: |
| 478 | bb_error_msg("invalid mode"); |
| 479 | bb_show_usage(); |
| 480 | } |
| 481 | pec = argv[3][1] == 'p'; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | fd = i2c_dev_open(bus_num); |
| 486 | check_read_funcs(fd, mode, data_addr, pec); |
| 487 | i2c_set_slave_addr(fd, bus_addr, opts & opt_f); |
| 488 | |
| 489 | if (!(opts & opt_y)) |
| 490 | confirm_action(bus_addr, mode, data_addr, pec); |
| 491 | |
| 492 | if (pec) |
| 493 | i2c_set_pec(fd, 1); |
| 494 | |
| 495 | switch (mode) { |
| 496 | case I2C_SMBUS_BYTE: |
| 497 | if (data_addr >= 0) { |
| 498 | status = i2c_smbus_write_byte(fd, data_addr); |
| 499 | if (status < 0) |
| 500 | bb_error_msg("warning - write failed"); |
| 501 | } |
| 502 | status = i2c_smbus_read_byte(fd); |
| 503 | break; |
| 504 | case I2C_SMBUS_WORD_DATA: |
| 505 | status = i2c_smbus_read_word_data(fd, data_addr); |
| 506 | break; |
| 507 | default: /* I2C_SMBUS_BYTE_DATA */ |
| 508 | status = i2c_smbus_read_byte_data(fd, data_addr); |
| 509 | } |
| 510 | close(fd); |
| 511 | |
| 512 | if (status < 0) |
| 513 | bb_perror_msg_and_die("read failed"); |
| 514 | |
| 515 | printf("0x%0*x\n", mode == I2C_SMBUS_WORD_DATA ? 4 : 2, status); |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | #endif /* ENABLE_I2CGET */ |
| 520 | |
| 521 | #if ENABLE_I2CSET |
| 522 | //usage:#define i2cset_trivial_usage |
| 523 | //usage: "[-f] [-y] [-m MASK] BUS CHIP-ADDR DATA-ADDR [VALUE] ... [MODE]" |
| 524 | //usage:#define i2cset_full_usage "\n\n" |
| 525 | //usage: "Set I2C registers\n" |
| 526 | //usage: "\n I2CBUS i2c bus number" |
| 527 | //usage: "\n ADDRESS 0x03 - 0x77" |
| 528 | //usage: "\nMODE is:" |
| 529 | //usage: "\n c byte, no value" |
| 530 | //usage: "\n b byte data (default)" |
| 531 | //usage: "\n w word data" |
| 532 | //usage: "\n i I2C block data" |
| 533 | //usage: "\n s SMBus block data" |
| 534 | //usage: "\n Append p for SMBus PEC" |
| 535 | //usage: "\n" |
| 536 | //usage: "\n -f force access" |
| 537 | //usage: "\n -y disable interactive mode" |
| 538 | //usage: "\n -r read back and compare the result" |
| 539 | //usage: "\n -m MASK mask specifying which bits to write" |
| 540 | int i2cset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 541 | int i2cset_main(int argc, char **argv) |
| 542 | { |
| 543 | const unsigned opt_f = (1 << 0), opt_y = (1 << 1), |
| 544 | opt_m = (1 << 2), opt_r = (1 << 3); |
| 545 | const char *const optstr = "fym:r"; |
| 546 | |
| 547 | int bus_num, bus_addr, data_addr, mode = I2C_SMBUS_BYTE, pec = 0; |
| 548 | int val, blen = 0, mask = 0, fd, status; |
| 549 | unsigned char block[I2C_SMBUS_BLOCK_MAX]; |
| 550 | char *opt_m_arg = NULL; |
| 551 | unsigned opts; |
| 552 | |
| 553 | opt_complementary = "-3"; /* from 3 to ? args */ |
| 554 | opts = getopt32(argv, optstr, &opt_m_arg); |
| 555 | argv += optind; |
| 556 | argc -= optind; |
| 557 | |
| 558 | bus_num = i2c_bus_lookup(argv[0]); |
| 559 | bus_addr = i2c_parse_bus_addr(argv[1]); |
| 560 | data_addr = i2c_parse_data_addr(argv[2]); |
| 561 | |
| 562 | if (argv[3]) { |
| 563 | if (!argv[4] && argv[3][0] != 'c') { |
| 564 | mode = I2C_SMBUS_BYTE_DATA; /* Implicit b */ |
| 565 | } else { |
| 566 | switch (argv[argc-1][0]) { |
| 567 | case 'c': /* Already set */ break; |
| 568 | case 'b': mode = I2C_SMBUS_BYTE_DATA; break; |
| 569 | case 'w': mode = I2C_SMBUS_WORD_DATA; break; |
| 570 | case 's': mode = I2C_SMBUS_BLOCK_DATA; break; |
| 571 | case 'i': mode = I2C_SMBUS_I2C_BLOCK_DATA; break; |
| 572 | default: |
| 573 | bb_error_msg("invalid mode"); |
| 574 | bb_show_usage(); |
| 575 | } |
| 576 | |
| 577 | pec = argv[argc-1][1] == 'p'; |
| 578 | if (mode == I2C_SMBUS_BLOCK_DATA || |
| 579 | mode == I2C_SMBUS_I2C_BLOCK_DATA) { |
| 580 | if (pec && mode == I2C_SMBUS_I2C_BLOCK_DATA) |
| 581 | bb_error_msg_and_die( |
| 582 | "PEC not supported for I2C " |
| 583 | "block writes"); |
| 584 | if (opts & opt_m) |
| 585 | bb_error_msg_and_die( |
| 586 | "mask not supported for block " |
| 587 | "writes"); |
| 588 | } |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | /* Prepare the value(s) to be written according to current mode. */ |
| 593 | switch (mode) { |
| 594 | case I2C_SMBUS_BYTE_DATA: |
| 595 | val = xstrtou_range(argv[3], 0, 0, 0xff); |
| 596 | break; |
| 597 | case I2C_SMBUS_WORD_DATA: |
| 598 | val = xstrtou_range(argv[3], 0, 0, 0xffff); |
| 599 | break; |
| 600 | case I2C_SMBUS_BLOCK_DATA: |
| 601 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 602 | for (blen = 3; blen < (argc - 1); blen++) |
| 603 | block[blen] = xstrtou_range(argv[blen], 0, 0, 0xff); |
| 604 | val = -1; |
| 605 | break; |
| 606 | default: |
| 607 | val = -1; |
| 608 | break; |
| 609 | } |
| 610 | |
| 611 | if (opts & opt_m) { |
| 612 | mask = xstrtou_range(opt_m_arg, 0, 0, |
| 613 | (mode == I2C_SMBUS_BYTE || |
| 614 | mode == I2C_SMBUS_BYTE_DATA) ? 0xff : 0xffff); |
| 615 | } |
| 616 | |
| 617 | fd = i2c_dev_open(bus_num); |
| 618 | check_write_funcs(fd, mode, pec); |
| 619 | i2c_set_slave_addr(fd, bus_addr, opts & opt_f); |
| 620 | |
| 621 | if (!(opts & opt_y)) |
| 622 | confirm_action(bus_addr, mode, data_addr, pec); |
| 623 | |
| 624 | /* |
| 625 | * If we're using mask - read the current value here and adjust the |
| 626 | * value to be written. |
| 627 | */ |
| 628 | if (opts & opt_m) { |
| 629 | int tmpval; |
| 630 | |
| 631 | switch (mode) { |
| 632 | case I2C_SMBUS_BYTE: |
| 633 | tmpval = i2c_smbus_read_byte(fd); |
| 634 | break; |
| 635 | case I2C_SMBUS_WORD_DATA: |
| 636 | tmpval = i2c_smbus_read_word_data(fd, data_addr); |
| 637 | break; |
| 638 | default: |
| 639 | tmpval = i2c_smbus_read_byte_data(fd, data_addr); |
| 640 | } |
| 641 | |
| 642 | if (tmpval < 0) |
| 643 | bb_perror_msg_and_die("can't read old value"); |
| 644 | |
| 645 | val = (val & mask) | (tmpval & ~mask); |
| 646 | |
| 647 | if (!(opts & opt_y)) { |
| 648 | bb_error_msg("old value 0x%0*x, write mask " |
| 649 | "0x%0*x, will write 0x%0*x to register " |
| 650 | "0x%02x", |
| 651 | mode == I2C_SMBUS_WORD_DATA ? 4 : 2, tmpval, |
| 652 | mode == I2C_SMBUS_WORD_DATA ? 4 : 2, mask, |
| 653 | mode == I2C_SMBUS_WORD_DATA ? 4 : 2, val, |
| 654 | data_addr); |
| 655 | confirm_or_abort(); |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | if (pec) |
| 660 | i2c_set_pec(fd, 1); |
| 661 | |
| 662 | switch (mode) { |
| 663 | case I2C_SMBUS_BYTE: |
| 664 | status = i2c_smbus_write_byte(fd, data_addr); |
| 665 | break; |
| 666 | case I2C_SMBUS_WORD_DATA: |
| 667 | status = i2c_smbus_write_word_data(fd, data_addr, val); |
| 668 | break; |
| 669 | case I2C_SMBUS_BLOCK_DATA: |
| 670 | status = i2c_smbus_write_block_data(fd, data_addr, |
| 671 | blen, block); |
| 672 | break; |
| 673 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 674 | status = i2c_smbus_write_i2c_block_data(fd, data_addr, |
| 675 | blen, block); |
| 676 | break; |
| 677 | default: /* I2C_SMBUS_BYTE_DATA */ |
| 678 | status = i2c_smbus_write_byte_data(fd, data_addr, val); |
| 679 | break; |
| 680 | } |
| 681 | if (status < 0) |
| 682 | bb_perror_msg_and_die("write failed"); |
| 683 | |
| 684 | if (pec) |
| 685 | i2c_set_pec(fd, 0); /* Clear PEC. */ |
| 686 | |
| 687 | /* No readback required - we're done. */ |
| 688 | if (!(opts & opt_r)) |
| 689 | return 0; |
| 690 | |
| 691 | switch (mode) { |
| 692 | case I2C_SMBUS_BYTE: |
| 693 | status = i2c_smbus_read_byte(fd); |
| 694 | val = data_addr; |
| 695 | break; |
| 696 | case I2C_SMBUS_WORD_DATA: |
| 697 | status = i2c_smbus_read_word_data(fd, data_addr); |
| 698 | break; |
| 699 | default: /* I2C_SMBUS_BYTE_DATA */ |
| 700 | status = i2c_smbus_read_byte_data(fd, data_addr); |
| 701 | } |
| 702 | |
| 703 | if (status < 0) { |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 704 | puts("Warning - readback failed"); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 705 | } else |
| 706 | if (status != val) { |
| 707 | printf("Warning - data mismatch - wrote " |
| 708 | "0x%0*x, read back 0x%0*x\n", |
| 709 | mode == I2C_SMBUS_WORD_DATA ? 4 : 2, val, |
| 710 | mode == I2C_SMBUS_WORD_DATA ? 4 : 2, status); |
| 711 | } else { |
| 712 | printf("Value 0x%0*x written, readback matched\n", |
| 713 | mode == I2C_SMBUS_WORD_DATA ? 4 : 2, val); |
| 714 | } |
| 715 | |
| 716 | return 0; |
| 717 | } |
| 718 | #endif /* ENABLE_I2CSET */ |
| 719 | |
| 720 | #if ENABLE_I2CDUMP |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 721 | static int read_block_data(int buf_fd, int mode, int *block) |
| 722 | { |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 723 | uint8_t cblock[I2C_SMBUS_BLOCK_MAX + I2CDUMP_NUM_REGS]; |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 724 | int res, blen = 0, tmp, i; |
| 725 | |
| 726 | if (mode == I2C_SMBUS_BLOCK_DATA || mode == I2C_SMBUS_I2C_BLOCK_DATA) { |
| 727 | res = i2c_smbus_read_block_data(buf_fd, 0, cblock); |
| 728 | blen = res; |
| 729 | } else { |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 730 | for (res = 0; res < I2CDUMP_NUM_REGS; res += tmp) { |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 731 | tmp = i2c_smbus_read_i2c_block_data( |
| 732 | buf_fd, res, I2C_SMBUS_BLOCK_MAX, |
| 733 | cblock + res); |
| 734 | if (tmp < 0) { |
| 735 | bb_error_msg_and_die("block read failed"); |
| 736 | } |
| 737 | } |
| 738 | |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 739 | if (res >= I2CDUMP_NUM_REGS) |
| 740 | res = I2CDUMP_NUM_REGS; |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 741 | |
| 742 | for (i = 0; i < res; i++) |
| 743 | block[i] = cblock[i]; |
| 744 | |
| 745 | if (mode != I2C_SMBUS_BLOCK_DATA) |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 746 | for (i = res; i < I2CDUMP_NUM_REGS; i++) |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 747 | block[i] = -1; |
| 748 | } |
| 749 | |
| 750 | return blen; |
| 751 | } |
| 752 | |
| 753 | /* Dump all but word data. */ |
| 754 | static void dump_data(int bus_fd, int mode, unsigned first, |
| 755 | unsigned last, int *block, int blen) |
| 756 | { |
| 757 | int i, j, res; |
| 758 | |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 759 | puts(" 0 1 2 3 4 5 6 7 8 9 a b c d e f" |
| 760 | " 0123456789abcdef"); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 761 | |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 762 | for (i = 0; i < I2CDUMP_NUM_REGS; i += 0x10) { |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 763 | if (mode == I2C_SMBUS_BLOCK_DATA && i >= blen) |
| 764 | break; |
| 765 | if (i/16 < first/16) |
| 766 | continue; |
| 767 | if (i/16 > last/16) |
| 768 | break; |
| 769 | |
| 770 | printf("%02x: ", i); |
| 771 | for (j = 0; j < 16; j++) { |
| 772 | fflush_all(); |
| 773 | /* Skip unwanted registers */ |
| 774 | if (i+j < first || i+j > last) { |
| 775 | printf(" "); |
| 776 | if (mode == I2C_SMBUS_WORD_DATA) { |
| 777 | printf(" "); |
| 778 | j++; |
| 779 | } |
| 780 | continue; |
| 781 | } |
| 782 | |
| 783 | switch (mode) { |
| 784 | case I2C_SMBUS_BYTE_DATA: |
| 785 | res = i2c_smbus_read_byte_data(bus_fd, i+j); |
| 786 | block[i+j] = res; |
| 787 | break; |
| 788 | case I2C_SMBUS_WORD_DATA: |
| 789 | res = i2c_smbus_read_word_data(bus_fd, i+j); |
| 790 | if (res < 0) { |
| 791 | block[i+j] = res; |
| 792 | block[i+j+1] = res; |
| 793 | } else { |
| 794 | block[i+j] = res & 0xff; |
| 795 | block[i+j+1] = res >> 8; |
| 796 | } |
| 797 | break; |
| 798 | case I2C_SMBUS_BYTE: |
| 799 | res = i2c_smbus_read_byte(bus_fd); |
| 800 | block[i+j] = res; |
| 801 | break; |
| 802 | default: |
| 803 | res = block[i+j]; |
| 804 | } |
| 805 | |
| 806 | if (mode == I2C_SMBUS_BLOCK_DATA && |
| 807 | i+j >= blen) { |
| 808 | printf(" "); |
| 809 | } else if (res < 0) { |
| 810 | printf("XX "); |
| 811 | if (mode == I2C_SMBUS_WORD_DATA) |
| 812 | printf("XX "); |
| 813 | } else { |
| 814 | printf("%02x ", block[i+j]); |
| 815 | if (mode == I2C_SMBUS_WORD_DATA) |
| 816 | printf("%02x ", block[i+j+1]); |
| 817 | } |
| 818 | |
| 819 | if (mode == I2C_SMBUS_WORD_DATA) |
| 820 | j++; |
| 821 | } |
| 822 | printf(" "); |
| 823 | |
| 824 | for (j = 0; j < 16; j++) { |
| 825 | if (mode == I2C_SMBUS_BLOCK_DATA && i+j >= blen) |
| 826 | break; |
| 827 | /* Skip unwanted registers */ |
| 828 | if (i+j < first || i+j > last) { |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 829 | bb_putchar(' '); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 830 | continue; |
| 831 | } |
| 832 | |
| 833 | res = block[i+j]; |
| 834 | if (res < 0) { |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 835 | bb_putchar('X'); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 836 | } else if (res == 0x00 || res == 0xff) { |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 837 | bb_putchar('.'); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 838 | } else if (res < 32 || res >= 127) { |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 839 | bb_putchar('?'); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 840 | } else { |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 841 | bb_putchar(res); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 842 | } |
| 843 | } |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 844 | bb_putchar('\n'); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 845 | } |
| 846 | } |
| 847 | |
| 848 | static void dump_word_data(int bus_fd, unsigned first, unsigned last) |
| 849 | { |
| 850 | int i, j, rv; |
| 851 | |
| 852 | /* Word data. */ |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 853 | puts(" 0,8 1,9 2,a 3,b 4,c 5,d 6,e 7,f"); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 854 | for (i = 0; i < 256; i += 8) { |
| 855 | if (i/8 < first/8) |
| 856 | continue; |
| 857 | if (i/8 > last/8) |
| 858 | break; |
| 859 | |
| 860 | printf("%02x: ", i); |
| 861 | for (j = 0; j < 8; j++) { |
| 862 | /* Skip unwanted registers. */ |
| 863 | if (i+j < first || i+j > last) { |
| 864 | printf(" "); |
| 865 | continue; |
| 866 | } |
| 867 | |
| 868 | rv = i2c_smbus_read_word_data(bus_fd, i+j); |
| 869 | if (rv < 0) |
| 870 | printf("XXXX "); |
| 871 | else |
| 872 | printf("%04x ", rv & 0xffff); |
| 873 | } |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 874 | bb_putchar('\n'); |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 875 | } |
| 876 | } |
| 877 | |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 878 | //usage:#define i2cdump_trivial_usage |
| 879 | //usage: "[-f] [-r FIRST-LAST] [-y] BUS ADDR [MODE]" |
| 880 | //usage:#define i2cdump_full_usage "\n\n" |
| 881 | //usage: "Examine I2C registers\n" |
| 882 | //usage: "\n I2CBUS i2c bus number" |
| 883 | //usage: "\n ADDRESS 0x03 - 0x77" |
| 884 | //usage: "\nMODE is:" |
| 885 | //usage: "\n b byte (default)" |
| 886 | //usage: "\n w word" |
| 887 | //usage: "\n W word on even register addresses" |
| 888 | //usage: "\n i I2C block" |
| 889 | //usage: "\n s SMBus block" |
| 890 | //usage: "\n c consecutive byte" |
| 891 | //usage: "\n Append p for SMBus PEC" |
| 892 | //usage: "\n" |
| 893 | //usage: "\n -f force access" |
| 894 | //usage: "\n -y disable interactive mode" |
| 895 | //usage: "\n -r limit the number of registers being accessed" |
| 896 | int i2cdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 897 | int i2cdump_main(int argc UNUSED_PARAM, char **argv) |
| 898 | { |
| 899 | const unsigned opt_f = (1 << 0), opt_y = (1 << 1), |
| 900 | opt_r = (1 << 2); |
| 901 | const char *const optstr = "fyr:"; |
| 902 | |
| 903 | int bus_num, bus_addr, mode = I2C_SMBUS_BYTE_DATA, even = 0, pec = 0; |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 904 | unsigned first = 0x00, last = 0xff, opts; |
| 905 | int *block = (int *)bb_common_bufsiz1; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 906 | char *opt_r_str, *dash; |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 907 | int fd, res, blen; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 908 | |
| 909 | opt_complementary = "-2:?3"; /* from 2 to 3 args */ |
| 910 | opts = getopt32(argv, optstr, &opt_r_str); |
| 911 | argv += optind; |
| 912 | |
| 913 | bus_num = i2c_bus_lookup(argv[0]); |
| 914 | bus_addr = i2c_parse_bus_addr(argv[1]); |
| 915 | |
| 916 | if (argv[2]) { |
| 917 | switch (argv[2][0]) { |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 918 | case 'b': /* Already set. */ break; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 919 | case 'c': mode = I2C_SMBUS_BYTE; break; |
| 920 | case 'w': mode = I2C_SMBUS_WORD_DATA; break; |
| 921 | case 'W': |
| 922 | mode = I2C_SMBUS_WORD_DATA; |
| 923 | even = 1; |
| 924 | break; |
| 925 | case 's': mode = I2C_SMBUS_BLOCK_DATA; break; |
| 926 | case 'i': mode = I2C_SMBUS_I2C_BLOCK_DATA; break; |
| 927 | default: |
| 928 | bb_error_msg_and_die("invalid mode"); |
| 929 | } |
| 930 | |
| 931 | if (argv[2][1] == 'p') { |
| 932 | if (argv[2][0] == 'W' || argv[2][0] == 'i') { |
| 933 | bb_error_msg_and_die( |
| 934 | "pec not supported for -W and -i"); |
| 935 | } else { |
| 936 | pec = 1; |
| 937 | } |
| 938 | } |
| 939 | } |
| 940 | |
| 941 | if (opts & opt_r) { |
| 942 | first = strtol(opt_r_str, &dash, 0); |
| 943 | if (dash == opt_r_str || *dash != '-' || first > 0xff) |
| 944 | bb_error_msg_and_die("invalid range"); |
| 945 | last = xstrtou_range(++dash, 0, first, 0xff); |
| 946 | |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 947 | /* Range is not available for every mode. */ |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 948 | switch (mode) { |
| 949 | case I2C_SMBUS_BYTE: |
| 950 | case I2C_SMBUS_BYTE_DATA: |
| 951 | break; |
| 952 | case I2C_SMBUS_WORD_DATA: |
| 953 | if (!even || (!(first % 2) && last % 2)) |
| 954 | break; |
| 955 | /* Fall through */ |
| 956 | default: |
| 957 | bb_error_msg_and_die( |
| 958 | "range not compatible with selected mode"); |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | fd = i2c_dev_open(bus_num); |
| 963 | check_read_funcs(fd, mode, -1 /* data_addr */, pec); |
| 964 | i2c_set_slave_addr(fd, bus_addr, opts & opt_f); |
| 965 | |
| 966 | if (pec) |
| 967 | i2c_set_pec(fd, 1); |
| 968 | |
| 969 | if (!(opts & opt_y)) |
| 970 | confirm_action(bus_addr, mode, -1 /* data_addr */, pec); |
| 971 | |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 972 | /* All but word data. */ |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 973 | if (mode != I2C_SMBUS_WORD_DATA || even) { |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 974 | blen = read_block_data(fd, mode, block); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 975 | |
| 976 | if (mode == I2C_SMBUS_BYTE) { |
| 977 | res = i2c_smbus_write_byte(fd, first); |
| 978 | if (res < 0) |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 979 | bb_perror_msg_and_die("write start address"); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 980 | } |
| 981 | |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 982 | dump_data(fd, mode, first, last, block, blen); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 983 | } else { |
Bartosz Golaszewski | aeb11a9 | 2015-06-05 10:27:31 +0200 | [diff] [blame] | 984 | dump_word_data(fd, first, last); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 985 | } |
| 986 | |
| 987 | return 0; |
| 988 | } |
| 989 | #endif /* ENABLE_I2CDUMP */ |
| 990 | |
| 991 | #if ENABLE_I2CDETECT |
| 992 | enum adapter_type { |
| 993 | ADT_DUMMY = 0, |
| 994 | ADT_ISA, |
| 995 | ADT_I2C, |
| 996 | ADT_SMBUS, |
| 997 | }; |
| 998 | |
| 999 | struct adap_desc { |
| 1000 | const char *funcs; |
| 1001 | const char *algo; |
| 1002 | }; |
| 1003 | |
| 1004 | static const struct adap_desc adap_descs[] = { |
| 1005 | { .funcs = "dummy", |
| 1006 | .algo = "Dummy bus", }, |
| 1007 | { .funcs = "isa", |
| 1008 | .algo = "ISA bus", }, |
| 1009 | { .funcs = "i2c", |
| 1010 | .algo = "I2C adapter", }, |
| 1011 | { .funcs = "smbus", |
| 1012 | .algo = "SMBus adapter", }, |
| 1013 | }; |
| 1014 | |
| 1015 | struct i2c_func |
| 1016 | { |
| 1017 | long value; |
| 1018 | const char* name; |
| 1019 | }; |
| 1020 | |
| 1021 | static const struct i2c_func i2c_funcs_tab[] = { |
| 1022 | { .value = I2C_FUNC_I2C, |
| 1023 | .name = "I2C" }, |
| 1024 | { .value = I2C_FUNC_SMBUS_QUICK, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1025 | .name = "SMBus quick command" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1026 | { .value = I2C_FUNC_SMBUS_WRITE_BYTE, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1027 | .name = "SMBus send byte" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1028 | { .value = I2C_FUNC_SMBUS_READ_BYTE, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1029 | .name = "SMBus receive byte" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1030 | { .value = I2C_FUNC_SMBUS_WRITE_BYTE_DATA, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1031 | .name = "SMBus write byte" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1032 | { .value = I2C_FUNC_SMBUS_READ_BYTE_DATA, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1033 | .name = "SMBus read byte" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1034 | { .value = I2C_FUNC_SMBUS_WRITE_WORD_DATA, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1035 | .name = "SMBus write word" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1036 | { .value = I2C_FUNC_SMBUS_READ_WORD_DATA, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1037 | .name = "SMBus read word" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1038 | { .value = I2C_FUNC_SMBUS_PROC_CALL, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1039 | .name = "SMBus process call" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1040 | { .value = I2C_FUNC_SMBUS_WRITE_BLOCK_DATA, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1041 | .name = "SMBus block write" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1042 | { .value = I2C_FUNC_SMBUS_READ_BLOCK_DATA, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1043 | .name = "SMBus block read" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1044 | { .value = I2C_FUNC_SMBUS_BLOCK_PROC_CALL, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1045 | .name = "SMBus block process call" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1046 | { .value = I2C_FUNC_SMBUS_PEC, |
| 1047 | .name = "SMBus PEC" }, |
| 1048 | { .value = I2C_FUNC_SMBUS_WRITE_I2C_BLOCK, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1049 | .name = "I2C block write" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1050 | { .value = I2C_FUNC_SMBUS_READ_I2C_BLOCK, |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1051 | .name = "I2C block read" }, |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1052 | { .value = 0, .name = NULL } |
| 1053 | }; |
| 1054 | |
| 1055 | static enum adapter_type i2cdetect_get_funcs(int bus) |
| 1056 | { |
| 1057 | enum adapter_type ret; |
| 1058 | unsigned long funcs; |
| 1059 | int fd; |
| 1060 | |
| 1061 | fd = i2c_dev_open(bus); |
| 1062 | |
| 1063 | get_funcs_matrix(fd, &funcs); |
| 1064 | if (funcs & I2C_FUNC_I2C) |
| 1065 | ret = ADT_I2C; |
| 1066 | else if (funcs & (I2C_FUNC_SMBUS_BYTE | |
| 1067 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 1068 | I2C_FUNC_SMBUS_WORD_DATA)) |
| 1069 | ret = ADT_SMBUS; |
| 1070 | else |
| 1071 | ret = ADT_DUMMY; |
| 1072 | |
| 1073 | close(fd); |
| 1074 | |
| 1075 | return ret; |
| 1076 | } |
| 1077 | |
| 1078 | static void NORETURN list_i2c_busses_and_exit(void) |
| 1079 | { |
| 1080 | const char *const i2cdev_path = "/sys/class/i2c-dev"; |
| 1081 | |
| 1082 | char path[NAME_MAX], name[128]; |
| 1083 | struct dirent *de, *subde; |
| 1084 | enum adapter_type adt; |
| 1085 | DIR *dir, *subdir; |
| 1086 | int rv, bus; |
| 1087 | char *pos; |
| 1088 | FILE *fp; |
| 1089 | |
| 1090 | /* |
| 1091 | * XXX Upstream i2cdetect also looks for i2c bus info in /proc/bus/i2c, |
| 1092 | * but we won't bother since it's only useful on older kernels (before |
| 1093 | * 2.6.5). We expect sysfs to be present and mounted at /sys/. |
| 1094 | */ |
| 1095 | |
| 1096 | dir = xopendir(i2cdev_path); |
| 1097 | while ((de = readdir(dir))) { |
| 1098 | if (de->d_name[0] == '.') |
| 1099 | continue; |
| 1100 | |
| 1101 | /* Simple version for ISA chips. */ |
| 1102 | snprintf(path, NAME_MAX, "%s/%s/name", |
| 1103 | i2cdev_path, de->d_name); |
| 1104 | fp = fopen(path, "r"); |
| 1105 | if (fp == NULL) { |
| 1106 | snprintf(path, NAME_MAX, |
| 1107 | "%s/%s/device/name", |
| 1108 | i2cdev_path, de->d_name); |
| 1109 | fp = fopen(path, "r"); |
| 1110 | } |
| 1111 | |
| 1112 | /* Non-ISA chips require the hard-way. */ |
| 1113 | if (fp == NULL) { |
| 1114 | snprintf(path, NAME_MAX, |
| 1115 | "%s/%s/device/name", |
| 1116 | i2cdev_path, de->d_name); |
| 1117 | subdir = opendir(path); |
| 1118 | if (subdir == NULL) |
| 1119 | continue; |
| 1120 | |
| 1121 | while ((subde = readdir(subdir))) { |
| 1122 | if (subde->d_name[0] == '.') |
| 1123 | continue; |
| 1124 | |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 1125 | if (is_prefixed_with(subde->d_name, "i2c-")) { |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1126 | snprintf(path, NAME_MAX, |
| 1127 | "%s/%s/device/%s/name", |
| 1128 | i2cdev_path, de->d_name, |
| 1129 | subde->d_name); |
| 1130 | fp = fopen(path, "r"); |
Bartosz Golaszewski | d908992 | 2015-06-05 10:27:32 +0200 | [diff] [blame] | 1131 | break; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1132 | } |
| 1133 | } |
| 1134 | } |
| 1135 | |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1136 | if (fp != NULL) { |
| 1137 | /* |
| 1138 | * Get the rest of the info and display a line |
| 1139 | * for a single bus. |
| 1140 | */ |
| 1141 | memset(name, 0, sizeof(name)); |
| 1142 | pos = fgets(name, sizeof(name), fp); |
| 1143 | fclose(fp); |
| 1144 | if (pos == NULL) |
| 1145 | continue; |
| 1146 | |
| 1147 | pos = strchr(name, '\n'); |
| 1148 | if (pos != NULL) |
| 1149 | *pos = '\0'; |
| 1150 | |
| 1151 | rv = sscanf(de->d_name, "i2c-%d", &bus); |
| 1152 | if (rv != 1) |
| 1153 | continue; |
| 1154 | |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 1155 | if (is_prefixed_with(name, "ISA")) |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1156 | adt = ADT_ISA; |
| 1157 | else |
| 1158 | adt = i2cdetect_get_funcs(bus); |
| 1159 | |
| 1160 | printf( |
| 1161 | "i2c-%d\t%-10s\t%-32s\t%s\n", |
| 1162 | bus, adap_descs[adt].funcs, |
| 1163 | name, adap_descs[adt].algo); |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | exit(EXIT_SUCCESS); |
| 1168 | } |
| 1169 | |
| 1170 | static void NORETURN no_support(const char *cmd) |
| 1171 | { |
| 1172 | bb_error_msg_and_die("bus doesn't support %s", cmd); |
| 1173 | } |
| 1174 | |
| 1175 | static void will_skip(const char *cmd) |
| 1176 | { |
| 1177 | bb_error_msg( |
| 1178 | "warning: can't use %s command, " |
| 1179 | "will skip some addresses", cmd); |
| 1180 | } |
| 1181 | |
| 1182 | //usage:#define i2cdetect_trivial_usage |
| 1183 | //usage: "[-F I2CBUS] [-l] [-y] [-a] [-q|-r] I2CBUS [FIRST LAST]" |
| 1184 | //usage:#define i2cdetect_full_usage "\n\n" |
| 1185 | //usage: "Detect I2C chips.\n" |
| 1186 | //usage: "\n I2CBUS i2c bus number" |
| 1187 | //usage: "\n FIRST and LAST limit the probing range" |
| 1188 | //usage: "\n" |
| 1189 | //usage: "\n -l output list of installed busses" |
| 1190 | //usage: "\n -y disable interactive mode" |
| 1191 | //usage: "\n -a force scanning of non-regular addresses" |
| 1192 | //usage: "\n -q use smbus quick write commands for probing (default)" |
| 1193 | //usage: "\n -r use smbus read byte commands for probing" |
| 1194 | //usage: "\n -F display list of functionalities" |
| 1195 | int i2cdetect_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 1196 | int i2cdetect_main(int argc UNUSED_PARAM, char **argv) |
| 1197 | { |
| 1198 | const unsigned opt_y = (1 << 0), opt_a = (1 << 1), |
| 1199 | opt_q = (1 << 2), opt_r = (1 << 3), |
| 1200 | opt_F = (1 << 4), opt_l = (1 << 5); |
| 1201 | const char *const optstr = "yaqrFl"; |
| 1202 | |
Bartosz Golaszewski | 99f025a | 2015-10-27 17:15:00 +0100 | [diff] [blame^] | 1203 | int fd, bus_num, i, j, mode = I2CDETECT_MODE_AUTO, status, cmd; |
Bartosz Golaszewski | e545bf6 | 2015-06-05 10:27:29 +0200 | [diff] [blame] | 1204 | unsigned first = 0x03, last = 0x77, opts; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1205 | unsigned long funcs; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1206 | |
| 1207 | opt_complementary = "q--r:r--q:" /* mutually exclusive */ |
Bartosz Golaszewski | b2cca32 | 2015-05-11 17:22:10 +0200 | [diff] [blame] | 1208 | "?3"; /* up to 3 args */ |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1209 | opts = getopt32(argv, optstr); |
| 1210 | argv += optind; |
| 1211 | |
| 1212 | if (opts & opt_l) |
| 1213 | list_i2c_busses_and_exit(); |
| 1214 | |
Bartosz Golaszewski | b2cca32 | 2015-05-11 17:22:10 +0200 | [diff] [blame] | 1215 | if (!argv[0]) |
| 1216 | bb_show_usage(); |
| 1217 | |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1218 | bus_num = i2c_bus_lookup(argv[0]); |
| 1219 | fd = i2c_dev_open(bus_num); |
| 1220 | get_funcs_matrix(fd, &funcs); |
| 1221 | |
| 1222 | if (opts & opt_F) { |
| 1223 | /* Only list the functionalities. */ |
| 1224 | printf("Functionalities implemented by bus #%d\n", bus_num); |
| 1225 | for (i = 0; i2c_funcs_tab[i].value; i++) { |
| 1226 | printf("%-32s %s\n", i2c_funcs_tab[i].name, |
| 1227 | funcs & i2c_funcs_tab[i].value ? "yes" : "no"); |
| 1228 | } |
| 1229 | |
| 1230 | return EXIT_SUCCESS; |
| 1231 | } |
| 1232 | |
| 1233 | if (opts & opt_r) |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1234 | mode = I2CDETECT_MODE_READ; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1235 | else if (opts & opt_q) |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1236 | mode = I2CDETECT_MODE_QUICK; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1237 | |
Bartosz Golaszewski | e545bf6 | 2015-06-05 10:27:29 +0200 | [diff] [blame] | 1238 | if (opts & opt_a) { |
| 1239 | first = 0x00; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1240 | last = 0x7f; |
Bartosz Golaszewski | e545bf6 | 2015-06-05 10:27:29 +0200 | [diff] [blame] | 1241 | } |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1242 | |
| 1243 | /* Read address range. */ |
| 1244 | if (argv[1]) { |
| 1245 | first = xstrtou_range(argv[1], 16, first, last); |
| 1246 | if (argv[2]) |
| 1247 | last = xstrtou_range(argv[2], 16, first, last); |
| 1248 | } |
| 1249 | |
| 1250 | if (!(funcs & (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_READ_BYTE))) { |
| 1251 | no_support("detection commands"); |
| 1252 | } else |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1253 | if (mode == I2CDETECT_MODE_QUICK && !(funcs & I2C_FUNC_SMBUS_QUICK)) { |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1254 | no_support("SMBus quick write"); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1255 | } else |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1256 | if (mode == I2CDETECT_MODE_READ && !(funcs & I2C_FUNC_SMBUS_READ_BYTE)) { |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1257 | no_support("SMBus receive byte"); |
Bartosz Golaszewski | 2204472 | 2015-06-05 10:27:30 +0200 | [diff] [blame] | 1258 | } |
| 1259 | |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1260 | if (mode == I2CDETECT_MODE_AUTO) { |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1261 | if (!(funcs & I2C_FUNC_SMBUS_QUICK)) |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1262 | will_skip("SMBus quick write"); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1263 | if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) |
Denys Vlasenko | 7f3a2a2 | 2015-10-08 11:24:44 +0200 | [diff] [blame] | 1264 | will_skip("SMBus receive byte"); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1265 | } |
| 1266 | |
| 1267 | if (!(opts & opt_y)) |
| 1268 | confirm_action(-1, -1, -1, 0); |
| 1269 | |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 1270 | puts(" 0 1 2 3 4 5 6 7 8 9 a b c d e f"); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1271 | for (i = 0; i < 128; i += 16) { |
| 1272 | printf("%02x: ", i); |
| 1273 | for(j = 0; j < 16; j++) { |
| 1274 | fflush_all(); |
| 1275 | |
Bartosz Golaszewski | 99f025a | 2015-10-27 17:15:00 +0100 | [diff] [blame^] | 1276 | cmd = mode; |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1277 | if (mode == I2CDETECT_MODE_AUTO) { |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1278 | if ((i+j >= 0x30 && i+j <= 0x37) || |
| 1279 | (i+j >= 0x50 && i+j <= 0x5F)) |
Bartosz Golaszewski | 99f025a | 2015-10-27 17:15:00 +0100 | [diff] [blame^] | 1280 | cmd = I2CDETECT_MODE_READ; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1281 | else |
Bartosz Golaszewski | 99f025a | 2015-10-27 17:15:00 +0100 | [diff] [blame^] | 1282 | cmd = I2CDETECT_MODE_QUICK; |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1283 | } |
| 1284 | |
| 1285 | /* Skip unwanted addresses. */ |
| 1286 | if (i+j < first |
| 1287 | || i+j > last |
Bartosz Golaszewski | 99f025a | 2015-10-27 17:15:00 +0100 | [diff] [blame^] | 1288 | || (cmd == I2CDETECT_MODE_READ && !(funcs & I2C_FUNC_SMBUS_READ_BYTE)) |
| 1289 | || (cmd == I2CDETECT_MODE_QUICK && !(funcs & I2C_FUNC_SMBUS_QUICK))) |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1290 | { |
| 1291 | printf(" "); |
| 1292 | continue; |
| 1293 | } |
| 1294 | |
Bartosz Golaszewski | 3147427 | 2015-06-05 10:27:28 +0200 | [diff] [blame] | 1295 | status = ioctl(fd, I2C_SLAVE, itoptr(i + j)); |
| 1296 | if (status < 0) { |
| 1297 | if (errno == EBUSY) { |
| 1298 | printf("UU "); |
| 1299 | continue; |
| 1300 | } |
| 1301 | |
| 1302 | bb_perror_msg_and_die( |
| 1303 | "can't set address to 0x%02x", i + j); |
| 1304 | } |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1305 | |
Bartosz Golaszewski | 99f025a | 2015-10-27 17:15:00 +0100 | [diff] [blame^] | 1306 | switch (cmd) { |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1307 | case I2CDETECT_MODE_READ: |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1308 | /* |
| 1309 | * This is known to lock SMBus on various |
| 1310 | * write-only chips (mainly clock chips). |
| 1311 | */ |
| 1312 | status = i2c_smbus_read_byte(fd); |
| 1313 | break; |
Bartosz Golaszewski | 2beb524 | 2015-09-04 10:38:48 +0200 | [diff] [blame] | 1314 | default: /* I2CDETECT_MODE_QUICK: */ |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1315 | /* |
| 1316 | * This is known to corrupt the Atmel |
| 1317 | * AT24RF08 EEPROM. |
| 1318 | */ |
| 1319 | status = i2c_smbus_write_quick(fd, |
| 1320 | I2C_SMBUS_WRITE); |
| 1321 | break; |
| 1322 | } |
| 1323 | |
| 1324 | if (status < 0) |
| 1325 | printf("-- "); |
| 1326 | else |
| 1327 | printf("%02x ", i+j); |
| 1328 | } |
Denys Vlasenko | d60752f | 2015-10-07 22:42:45 +0200 | [diff] [blame] | 1329 | bb_putchar('\n'); |
Bartosz Golaszewski | 622a7aa | 2015-02-10 03:16:25 +0100 | [diff] [blame] | 1330 | } |
| 1331 | |
| 1332 | return 0; |
| 1333 | } |
| 1334 | #endif /* ENABLE_I2CDETECT */ |