Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 1 | /* IIO - useful set of util functionality |
| 2 | * |
| 3 | * Copyright (c) 2008 Jonathan Cameron |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published by |
| 7 | * the Free Software Foundation. |
| 8 | */ |
Cristina Opriceana | 37e3be9 | 2015-03-04 02:37:15 +0200 | [diff] [blame] | 9 | #ifndef _IIO_UTILS_H |
| 10 | #define _IIO_UTILS_H |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 11 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 12 | #include <string.h> |
| 13 | #include <stdlib.h> |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 14 | #include <stdio.h> |
| 15 | #include <stdint.h> |
Lars-Peter Clausen | bc9f35d | 2011-10-26 17:27:44 +0100 | [diff] [blame] | 16 | #include <dirent.h> |
Peter Meerwald | bb23378 | 2012-06-25 23:12:17 +0200 | [diff] [blame] | 17 | #include <errno.h> |
Roberta Dobrescu | bdcb31d | 2015-02-26 10:49:24 +0200 | [diff] [blame] | 18 | #include <ctype.h> |
| 19 | #include "iio_utils.h" |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 20 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 21 | const char *iio_dir = "/sys/bus/iio/devices/"; |
| 22 | |
Irina Tirdea | d9d7b99 | 2015-03-27 13:53:00 +0200 | [diff] [blame] | 23 | static char * const iio_direction[] = { |
| 24 | "in", |
| 25 | "out", |
| 26 | }; |
| 27 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 28 | /** |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 29 | * iioutils_break_up_name() - extract generic name from full channel name |
| 30 | * @full_name: the full channel name |
| 31 | * @generic_name: the output generic channel name |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 32 | * |
| 33 | * Returns 0 on success, or a negative error code if string extraction failed. |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 34 | **/ |
Roberta Dobrescu | bdcb31d | 2015-02-26 10:49:24 +0200 | [diff] [blame] | 35 | int iioutils_break_up_name(const char *full_name, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 36 | char **generic_name) |
| 37 | { |
| 38 | char *current; |
| 39 | char *w, *r; |
Irina Tirdea | d9d7b99 | 2015-03-27 13:53:00 +0200 | [diff] [blame] | 40 | char *working, *prefix = ""; |
Hartmut Knaack | e9e45b4 | 2015-05-31 14:40:02 +0200 | [diff] [blame] | 41 | int i, ret; |
Melike Yurtoglu | 79bdd48 | 2014-10-03 23:35:54 +0300 | [diff] [blame] | 42 | |
Irina Tirdea | d9d7b99 | 2015-03-27 13:53:00 +0200 | [diff] [blame] | 43 | for (i = 0; i < sizeof(iio_direction) / sizeof(iio_direction[0]); i++) |
| 44 | if (!strncmp(full_name, iio_direction[i], |
| 45 | strlen(iio_direction[i]))) { |
| 46 | prefix = iio_direction[i]; |
| 47 | break; |
| 48 | } |
| 49 | |
| 50 | current = strdup(full_name + strlen(prefix) + 1); |
Hartmut Knaack | e9e45b4 | 2015-05-31 14:40:02 +0200 | [diff] [blame] | 51 | if (!current) |
| 52 | return -ENOMEM; |
| 53 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 54 | working = strtok(current, "_\0"); |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 55 | if (!working) { |
| 56 | free(current); |
| 57 | return -EINVAL; |
| 58 | } |
Irina Tirdea | d9d7b99 | 2015-03-27 13:53:00 +0200 | [diff] [blame] | 59 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 60 | w = working; |
| 61 | r = working; |
| 62 | |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 63 | while (*r != '\0') { |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 64 | if (!isdigit(*r)) { |
| 65 | *w = *r; |
| 66 | w++; |
| 67 | } |
| 68 | r++; |
| 69 | } |
| 70 | *w = '\0'; |
Hartmut Knaack | e9e45b4 | 2015-05-31 14:40:02 +0200 | [diff] [blame] | 71 | ret = asprintf(generic_name, "%s_%s", prefix, working); |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 72 | free(current); |
| 73 | |
Hartmut Knaack | e9e45b4 | 2015-05-31 14:40:02 +0200 | [diff] [blame] | 74 | return (ret == -1) ? -ENOMEM : 0; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | /** |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 78 | * iioutils_get_type() - find and process _type attribute data |
| 79 | * @is_signed: output whether channel is signed |
| 80 | * @bytes: output how many bytes the channel storage occupies |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 81 | * @bits_used: output number of valid bits of data |
| 82 | * @shift: output amount of bits to shift right data before applying bit mask |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 83 | * @mask: output a bit mask for the raw data |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 84 | * @be: output if data in big endian |
| 85 | * @device_dir: the IIO device directory |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 86 | * @name: the channel name |
| 87 | * @generic_name: the channel type name |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 88 | * |
| 89 | * Returns a value >= 0 on success, otherwise a negative error code. |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 90 | **/ |
Roberta Dobrescu | bdcb31d | 2015-02-26 10:49:24 +0200 | [diff] [blame] | 91 | int iioutils_get_type(unsigned *is_signed, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 92 | unsigned *bytes, |
| 93 | unsigned *bits_used, |
Jonathan Cameron | 52615d4 | 2011-05-18 14:41:19 +0100 | [diff] [blame] | 94 | unsigned *shift, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 95 | uint64_t *mask, |
Jonathan Cameron | 117cf8b | 2011-12-04 19:10:59 +0000 | [diff] [blame] | 96 | unsigned *be, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 97 | const char *device_dir, |
| 98 | const char *name, |
| 99 | const char *generic_name) |
| 100 | { |
| 101 | FILE *sysfsfp; |
| 102 | int ret; |
| 103 | DIR *dp; |
| 104 | char *scan_el_dir, *builtname, *builtname_generic, *filename = 0; |
Jonathan Cameron | 117cf8b | 2011-12-04 19:10:59 +0000 | [diff] [blame] | 105 | char signchar, endianchar; |
Michael Hennerich | fc7f95a | 2011-02-24 16:34:54 +0100 | [diff] [blame] | 106 | unsigned padint; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 107 | const struct dirent *ent; |
| 108 | |
| 109 | ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir); |
Hartmut Knaack | 0e79987 | 2015-05-31 14:40:17 +0200 | [diff] [blame^] | 110 | if (ret < 0) |
| 111 | return -ENOMEM; |
| 112 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 113 | ret = asprintf(&builtname, FORMAT_TYPE_FILE, name); |
| 114 | if (ret < 0) { |
| 115 | ret = -ENOMEM; |
| 116 | goto error_free_scan_el_dir; |
| 117 | } |
| 118 | ret = asprintf(&builtname_generic, FORMAT_TYPE_FILE, generic_name); |
| 119 | if (ret < 0) { |
| 120 | ret = -ENOMEM; |
| 121 | goto error_free_builtname; |
| 122 | } |
| 123 | |
| 124 | dp = opendir(scan_el_dir); |
| 125 | if (dp == NULL) { |
| 126 | ret = -errno; |
| 127 | goto error_free_builtname_generic; |
| 128 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 129 | ret = -ENOENT; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 130 | while (ent = readdir(dp), ent != NULL) |
| 131 | /* |
| 132 | * Do we allow devices to override a generic name with |
| 133 | * a specific one? |
| 134 | */ |
| 135 | if ((strcmp(builtname, ent->d_name) == 0) || |
| 136 | (strcmp(builtname_generic, ent->d_name) == 0)) { |
| 137 | ret = asprintf(&filename, |
| 138 | "%s/%s", scan_el_dir, ent->d_name); |
| 139 | if (ret < 0) { |
| 140 | ret = -ENOMEM; |
| 141 | goto error_closedir; |
| 142 | } |
| 143 | sysfsfp = fopen(filename, "r"); |
| 144 | if (sysfsfp == NULL) { |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 145 | ret = -errno; |
Hartmut Knaack | 2b6a6e6 | 2015-05-31 14:39:48 +0200 | [diff] [blame] | 146 | printf("failed to open %s\n", filename); |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 147 | goto error_free_filename; |
| 148 | } |
Jonathan Cameron | a7f7c36 | 2011-12-04 19:10:58 +0000 | [diff] [blame] | 149 | |
| 150 | ret = fscanf(sysfsfp, |
| 151 | "%ce:%c%u/%u>>%u", |
| 152 | &endianchar, |
| 153 | &signchar, |
| 154 | bits_used, |
| 155 | &padint, shift); |
| 156 | if (ret < 0) { |
Peter Meerwald | 578f737 | 2012-06-25 23:13:24 +0200 | [diff] [blame] | 157 | ret = -errno; |
Hartmut Knaack | 2b6a6e6 | 2015-05-31 14:39:48 +0200 | [diff] [blame] | 158 | printf("failed to pass scan type description\n"); |
Peter Meerwald | 578f737 | 2012-06-25 23:13:24 +0200 | [diff] [blame] | 159 | goto error_close_sysfsfp; |
Hartmut Knaack | dc8b5d6 | 2015-05-31 14:39:59 +0200 | [diff] [blame] | 160 | } else if (ret != 5) { |
| 161 | ret = -EIO; |
| 162 | printf("scan type description didn't match\n"); |
| 163 | goto error_close_sysfsfp; |
Jonathan Cameron | a7f7c36 | 2011-12-04 19:10:58 +0000 | [diff] [blame] | 164 | } |
Jonathan Cameron | 117cf8b | 2011-12-04 19:10:59 +0000 | [diff] [blame] | 165 | *be = (endianchar == 'b'); |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 166 | *bytes = padint / 8; |
Michael Hennerich | fc7f95a | 2011-02-24 16:34:54 +0100 | [diff] [blame] | 167 | if (*bits_used == 64) |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 168 | *mask = ~0; |
| 169 | else |
| 170 | *mask = (1 << *bits_used) - 1; |
| 171 | if (signchar == 's') |
| 172 | *is_signed = 1; |
| 173 | else |
| 174 | *is_signed = 0; |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 175 | if (fclose(sysfsfp)) { |
| 176 | ret = -errno; |
| 177 | printf("Failed to close %s\n", filename); |
| 178 | goto error_free_filename; |
| 179 | } |
| 180 | |
Jonathan Cameron | a7f7c36 | 2011-12-04 19:10:58 +0000 | [diff] [blame] | 181 | free(filename); |
| 182 | |
| 183 | filename = 0; |
Peter Meerwald | 578f737 | 2012-06-25 23:13:24 +0200 | [diff] [blame] | 184 | sysfsfp = 0; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 185 | } |
Peter Meerwald | 578f737 | 2012-06-25 23:13:24 +0200 | [diff] [blame] | 186 | error_close_sysfsfp: |
| 187 | if (sysfsfp) |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 188 | if (fclose(sysfsfp)) |
| 189 | perror("iioutils_get_type(): Failed to close file"); |
| 190 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 191 | error_free_filename: |
| 192 | if (filename) |
| 193 | free(filename); |
| 194 | error_closedir: |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 195 | if (closedir(dp) == -1) |
| 196 | perror("iioutils_get_type(): Failed to close directory"); |
| 197 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 198 | error_free_builtname_generic: |
| 199 | free(builtname_generic); |
| 200 | error_free_builtname: |
| 201 | free(builtname); |
| 202 | error_free_scan_el_dir: |
| 203 | free(scan_el_dir); |
Hartmut Knaack | 0e79987 | 2015-05-31 14:40:17 +0200 | [diff] [blame^] | 204 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 205 | return ret; |
| 206 | } |
| 207 | |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 208 | /** |
| 209 | * iioutils_get_param_float() - read a float value from a channel parameter |
| 210 | * @output: output the float value |
| 211 | * @param_name: the parameter name to read |
| 212 | * @device_dir: the IIO device directory in sysfs |
| 213 | * @name: the channel name |
| 214 | * @generic_name: the channel type name |
| 215 | * |
| 216 | * Returns a value >= 0 on success, otherwise a negative error code. |
| 217 | **/ |
Roberta Dobrescu | bdcb31d | 2015-02-26 10:49:24 +0200 | [diff] [blame] | 218 | int iioutils_get_param_float(float *output, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 219 | const char *param_name, |
| 220 | const char *device_dir, |
| 221 | const char *name, |
| 222 | const char *generic_name) |
| 223 | { |
| 224 | FILE *sysfsfp; |
| 225 | int ret; |
| 226 | DIR *dp; |
| 227 | char *builtname, *builtname_generic; |
| 228 | char *filename = NULL; |
| 229 | const struct dirent *ent; |
| 230 | |
| 231 | ret = asprintf(&builtname, "%s_%s", name, param_name); |
Hartmut Knaack | 0e79987 | 2015-05-31 14:40:17 +0200 | [diff] [blame^] | 232 | if (ret < 0) |
| 233 | return -ENOMEM; |
| 234 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 235 | ret = asprintf(&builtname_generic, |
| 236 | "%s_%s", generic_name, param_name); |
| 237 | if (ret < 0) { |
| 238 | ret = -ENOMEM; |
| 239 | goto error_free_builtname; |
| 240 | } |
| 241 | dp = opendir(device_dir); |
| 242 | if (dp == NULL) { |
| 243 | ret = -errno; |
| 244 | goto error_free_builtname_generic; |
| 245 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 246 | ret = -ENOENT; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 247 | while (ent = readdir(dp), ent != NULL) |
| 248 | if ((strcmp(builtname, ent->d_name) == 0) || |
| 249 | (strcmp(builtname_generic, ent->d_name) == 0)) { |
| 250 | ret = asprintf(&filename, |
| 251 | "%s/%s", device_dir, ent->d_name); |
| 252 | if (ret < 0) { |
| 253 | ret = -ENOMEM; |
| 254 | goto error_closedir; |
| 255 | } |
| 256 | sysfsfp = fopen(filename, "r"); |
| 257 | if (!sysfsfp) { |
| 258 | ret = -errno; |
| 259 | goto error_free_filename; |
| 260 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 261 | errno = 0; |
| 262 | if (fscanf(sysfsfp, "%f", output) != 1) |
| 263 | ret = errno ? -errno : -ENODATA; |
| 264 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 265 | break; |
| 266 | } |
| 267 | error_free_filename: |
| 268 | if (filename) |
| 269 | free(filename); |
| 270 | error_closedir: |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 271 | if (closedir(dp) == -1) |
| 272 | perror("iioutils_get_param_float(): Failed to close directory"); |
| 273 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 274 | error_free_builtname_generic: |
| 275 | free(builtname_generic); |
| 276 | error_free_builtname: |
| 277 | free(builtname); |
Hartmut Knaack | 0e79987 | 2015-05-31 14:40:17 +0200 | [diff] [blame^] | 278 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 279 | return ret; |
| 280 | } |
| 281 | |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 282 | /** |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 283 | * bsort_channel_array_by_index() - sort the array in index order |
| 284 | * @ci_array: the iio_channel_info array to be sorted |
| 285 | * @cnt: the amount of array elements |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 286 | **/ |
| 287 | |
Roberta Dobrescu | bdcb31d | 2015-02-26 10:49:24 +0200 | [diff] [blame] | 288 | void bsort_channel_array_by_index(struct iio_channel_info **ci_array, |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 289 | int cnt) |
| 290 | { |
| 291 | |
| 292 | struct iio_channel_info temp; |
| 293 | int x, y; |
| 294 | |
| 295 | for (x = 0; x < cnt; x++) |
| 296 | for (y = 0; y < (cnt - 1); y++) |
| 297 | if ((*ci_array)[y].index > (*ci_array)[y+1].index) { |
| 298 | temp = (*ci_array)[y + 1]; |
| 299 | (*ci_array)[y + 1] = (*ci_array)[y]; |
| 300 | (*ci_array)[y] = temp; |
| 301 | } |
| 302 | } |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 303 | |
| 304 | /** |
| 305 | * build_channel_array() - function to figure out what channels are present |
| 306 | * @device_dir: the IIO device directory in sysfs |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 307 | * @ci_array: output the resulting array of iio_channel_info |
| 308 | * @counter: output the amount of array elements |
| 309 | * |
| 310 | * Returns 0 on success, otherwise a negative error code. |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 311 | **/ |
Roberta Dobrescu | bdcb31d | 2015-02-26 10:49:24 +0200 | [diff] [blame] | 312 | int build_channel_array(const char *device_dir, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 313 | struct iio_channel_info **ci_array, |
| 314 | int *counter) |
| 315 | { |
| 316 | DIR *dp; |
| 317 | FILE *sysfsfp; |
Peter Meerwald | 1093792 | 2012-06-25 23:12:12 +0200 | [diff] [blame] | 318 | int count, i; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 319 | struct iio_channel_info *current; |
| 320 | int ret; |
| 321 | const struct dirent *ent; |
| 322 | char *scan_el_dir; |
| 323 | char *filename; |
| 324 | |
| 325 | *counter = 0; |
| 326 | ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir); |
Hartmut Knaack | 0e79987 | 2015-05-31 14:40:17 +0200 | [diff] [blame^] | 327 | if (ret < 0) |
| 328 | return -ENOMEM; |
| 329 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 330 | dp = opendir(scan_el_dir); |
| 331 | if (dp == NULL) { |
| 332 | ret = -errno; |
| 333 | goto error_free_name; |
| 334 | } |
| 335 | while (ent = readdir(dp), ent != NULL) |
| 336 | if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), |
| 337 | "_en") == 0) { |
| 338 | ret = asprintf(&filename, |
| 339 | "%s/%s", scan_el_dir, ent->d_name); |
| 340 | if (ret < 0) { |
| 341 | ret = -ENOMEM; |
| 342 | goto error_close_dir; |
| 343 | } |
| 344 | sysfsfp = fopen(filename, "r"); |
| 345 | if (sysfsfp == NULL) { |
| 346 | ret = -errno; |
| 347 | free(filename); |
| 348 | goto error_close_dir; |
| 349 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 350 | errno = 0; |
| 351 | if (fscanf(sysfsfp, "%i", &ret) != 1) { |
| 352 | ret = errno ? -errno : -ENODATA; |
| 353 | if (fclose(sysfsfp)) |
| 354 | perror("build_channel_array(): Failed to close file"); |
| 355 | |
| 356 | free(filename); |
| 357 | goto error_close_dir; |
| 358 | } |
| 359 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 360 | if (ret == 1) |
| 361 | (*counter)++; |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 362 | if (fclose(sysfsfp)) { |
| 363 | ret = -errno; |
| 364 | free(filename); |
| 365 | goto error_close_dir; |
| 366 | } |
| 367 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 368 | free(filename); |
| 369 | } |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 370 | *ci_array = malloc(sizeof(**ci_array) * (*counter)); |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 371 | if (*ci_array == NULL) { |
| 372 | ret = -ENOMEM; |
| 373 | goto error_close_dir; |
| 374 | } |
| 375 | seekdir(dp, 0); |
Michael Hennerich | 7ccd450 | 2011-02-24 16:34:53 +0100 | [diff] [blame] | 376 | count = 0; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 377 | while (ent = readdir(dp), ent != NULL) { |
| 378 | if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), |
| 379 | "_en") == 0) { |
Craig Markwardt | 66c65d9 | 2014-01-01 15:38:52 +0000 | [diff] [blame] | 380 | int current_enabled = 0; |
Melike Yurtoglu | 79bdd48 | 2014-10-03 23:35:54 +0300 | [diff] [blame] | 381 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 382 | current = &(*ci_array)[count++]; |
| 383 | ret = asprintf(&filename, |
| 384 | "%s/%s", scan_el_dir, ent->d_name); |
| 385 | if (ret < 0) { |
| 386 | ret = -ENOMEM; |
| 387 | /* decrement count to avoid freeing name */ |
| 388 | count--; |
| 389 | goto error_cleanup_array; |
| 390 | } |
| 391 | sysfsfp = fopen(filename, "r"); |
| 392 | if (sysfsfp == NULL) { |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 393 | ret = -errno; |
Hartmut Knaack | 2b6a6e6 | 2015-05-31 14:39:48 +0200 | [diff] [blame] | 394 | free(filename); |
Hartmut Knaack | 121b5e5 | 2015-05-31 14:39:45 +0200 | [diff] [blame] | 395 | count--; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 396 | goto error_cleanup_array; |
| 397 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 398 | errno = 0; |
| 399 | if (fscanf(sysfsfp, "%i", ¤t_enabled) != 1) { |
| 400 | ret = errno ? -errno : -ENODATA; |
| 401 | free(filename); |
| 402 | count--; |
| 403 | goto error_cleanup_array; |
| 404 | } |
| 405 | |
| 406 | if (fclose(sysfsfp)) { |
| 407 | ret = -errno; |
| 408 | free(filename); |
| 409 | count--; |
| 410 | goto error_cleanup_array; |
| 411 | } |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 412 | |
Craig Markwardt | 66c65d9 | 2014-01-01 15:38:52 +0000 | [diff] [blame] | 413 | if (!current_enabled) { |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 414 | free(filename); |
| 415 | count--; |
| 416 | continue; |
| 417 | } |
| 418 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 419 | current->scale = 1.0; |
| 420 | current->offset = 0; |
| 421 | current->name = strndup(ent->d_name, |
| 422 | strlen(ent->d_name) - |
| 423 | strlen("_en")); |
| 424 | if (current->name == NULL) { |
| 425 | free(filename); |
| 426 | ret = -ENOMEM; |
Hartmut Knaack | 121b5e5 | 2015-05-31 14:39:45 +0200 | [diff] [blame] | 427 | count--; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 428 | goto error_cleanup_array; |
| 429 | } |
| 430 | /* Get the generic and specific name elements */ |
| 431 | ret = iioutils_break_up_name(current->name, |
| 432 | ¤t->generic_name); |
| 433 | if (ret) { |
| 434 | free(filename); |
Hartmut Knaack | 121b5e5 | 2015-05-31 14:39:45 +0200 | [diff] [blame] | 435 | free(current->name); |
| 436 | count--; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 437 | goto error_cleanup_array; |
| 438 | } |
| 439 | ret = asprintf(&filename, |
| 440 | "%s/%s_index", |
| 441 | scan_el_dir, |
| 442 | current->name); |
| 443 | if (ret < 0) { |
| 444 | free(filename); |
| 445 | ret = -ENOMEM; |
| 446 | goto error_cleanup_array; |
| 447 | } |
| 448 | sysfsfp = fopen(filename, "r"); |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 449 | if (sysfsfp == NULL) { |
| 450 | ret = -errno; |
| 451 | printf("failed to open %s\n", filename); |
| 452 | free(filename); |
| 453 | goto error_cleanup_array; |
| 454 | } |
| 455 | |
| 456 | errno = 0; |
| 457 | if (fscanf(sysfsfp, "%u", ¤t->index) != 1) { |
| 458 | ret = errno ? -errno : -ENODATA; |
| 459 | if (fclose(sysfsfp)) |
| 460 | perror("build_channel_array(): Failed to close file"); |
| 461 | |
| 462 | free(filename); |
| 463 | goto error_cleanup_array; |
| 464 | } |
| 465 | |
| 466 | if (fclose(sysfsfp)) { |
| 467 | ret = -errno; |
| 468 | free(filename); |
| 469 | goto error_cleanup_array; |
| 470 | } |
| 471 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 472 | free(filename); |
| 473 | /* Find the scale */ |
| 474 | ret = iioutils_get_param_float(¤t->scale, |
| 475 | "scale", |
| 476 | device_dir, |
| 477 | current->name, |
| 478 | current->generic_name); |
| 479 | if (ret < 0) |
| 480 | goto error_cleanup_array; |
| 481 | ret = iioutils_get_param_float(¤t->offset, |
| 482 | "offset", |
| 483 | device_dir, |
| 484 | current->name, |
| 485 | current->generic_name); |
| 486 | if (ret < 0) |
| 487 | goto error_cleanup_array; |
| 488 | ret = iioutils_get_type(¤t->is_signed, |
| 489 | ¤t->bytes, |
| 490 | ¤t->bits_used, |
Jonathan Cameron | 52615d4 | 2011-05-18 14:41:19 +0100 | [diff] [blame] | 491 | ¤t->shift, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 492 | ¤t->mask, |
Jonathan Cameron | 117cf8b | 2011-12-04 19:10:59 +0000 | [diff] [blame] | 493 | ¤t->be, |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 494 | device_dir, |
| 495 | current->name, |
| 496 | current->generic_name); |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 497 | if (ret < 0) |
| 498 | goto error_cleanup_array; |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 499 | } |
| 500 | } |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 501 | |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 502 | if (closedir(dp) == -1) { |
| 503 | ret = -errno; |
| 504 | goto error_cleanup_array; |
| 505 | } |
| 506 | |
Hartmut Knaack | 66dd08f | 2015-05-31 14:39:43 +0200 | [diff] [blame] | 507 | free(scan_el_dir); |
Michael Hennerich | 8b68bb2 | 2011-03-08 08:55:48 +0100 | [diff] [blame] | 508 | /* reorder so that the array is in index order */ |
| 509 | bsort_channel_array_by_index(ci_array, *counter); |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 510 | |
| 511 | return 0; |
| 512 | |
| 513 | error_cleanup_array: |
Hartmut Knaack | 63f05c8 | 2015-05-31 14:39:44 +0200 | [diff] [blame] | 514 | for (i = count - 1; i >= 0; i--) { |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 515 | free((*ci_array)[i].name); |
Hartmut Knaack | 63f05c8 | 2015-05-31 14:39:44 +0200 | [diff] [blame] | 516 | free((*ci_array)[i].generic_name); |
| 517 | } |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 518 | free(*ci_array); |
| 519 | error_close_dir: |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 520 | if (dp) |
| 521 | if (closedir(dp) == -1) |
| 522 | perror("build_channel_array(): Failed to close dir"); |
| 523 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 524 | error_free_name: |
| 525 | free(scan_el_dir); |
Hartmut Knaack | 0e79987 | 2015-05-31 14:40:17 +0200 | [diff] [blame^] | 526 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 527 | return ret; |
| 528 | } |
| 529 | |
Hartmut Knaack | 096f9b8 | 2015-05-31 14:40:00 +0200 | [diff] [blame] | 530 | int calc_digits(int num) |
| 531 | { |
| 532 | int count = 0; |
| 533 | |
| 534 | while (num != 0) { |
| 535 | num /= 10; |
| 536 | count++; |
| 537 | } |
| 538 | |
| 539 | return count; |
| 540 | } |
| 541 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 542 | /** |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 543 | * find_type_by_name() - function to match top level types by name |
| 544 | * @name: top level type instance name |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 545 | * @type: the type of top level instance being searched |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 546 | * |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 547 | * Returns the device number of a matched IIO device on success, otherwise a |
| 548 | * negative error code. |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 549 | * Typical types this is used for are device and trigger. |
| 550 | **/ |
Roberta Dobrescu | bdcb31d | 2015-02-26 10:49:24 +0200 | [diff] [blame] | 551 | int find_type_by_name(const char *name, const char *type) |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 552 | { |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 553 | const struct dirent *ent; |
Hartmut Knaack | 096f9b8 | 2015-05-31 14:40:00 +0200 | [diff] [blame] | 554 | int number, numstrlen, ret; |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 555 | |
| 556 | FILE *nameFile; |
| 557 | DIR *dp; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 558 | char thisname[IIO_MAX_NAME_LENGTH]; |
| 559 | char *filename; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 560 | |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 561 | dp = opendir(iio_dir); |
| 562 | if (dp == NULL) { |
Peter Meerwald | c866ffc | 2012-07-01 00:47:41 +0200 | [diff] [blame] | 563 | printf("No industrialio devices available\n"); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 564 | return -ENODEV; |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 565 | } |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 566 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 567 | while (ent = readdir(dp), ent != NULL) { |
| 568 | if (strcmp(ent->d_name, ".") != 0 && |
| 569 | strcmp(ent->d_name, "..") != 0 && |
| 570 | strlen(ent->d_name) > strlen(type) && |
| 571 | strncmp(ent->d_name, type, strlen(type)) == 0) { |
Hartmut Knaack | 096f9b8 | 2015-05-31 14:40:00 +0200 | [diff] [blame] | 572 | errno = 0; |
| 573 | ret = sscanf(ent->d_name + strlen(type), "%d", &number); |
| 574 | if (ret < 0) { |
| 575 | ret = -errno; |
| 576 | printf("failed to read element number\n"); |
| 577 | goto error_close_dir; |
| 578 | } else if (ret != 1) { |
| 579 | ret = -EIO; |
| 580 | printf("failed to match element number\n"); |
| 581 | goto error_close_dir; |
| 582 | } |
| 583 | |
| 584 | numstrlen = calc_digits(number); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 585 | /* verify the next character is not a colon */ |
| 586 | if (strncmp(ent->d_name + strlen(type) + numstrlen, |
| 587 | ":", |
| 588 | 1) != 0) { |
| 589 | filename = malloc(strlen(iio_dir) |
| 590 | + strlen(type) |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 591 | + numstrlen |
Barry Song | b6ee30a | 2010-05-25 17:40:04 +0800 | [diff] [blame] | 592 | + 6); |
Peter Meerwald | a4d429e | 2012-06-25 23:13:25 +0200 | [diff] [blame] | 593 | if (filename == NULL) { |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 594 | ret = -ENOMEM; |
| 595 | goto error_close_dir; |
Peter Meerwald | a4d429e | 2012-06-25 23:13:25 +0200 | [diff] [blame] | 596 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 597 | |
| 598 | ret = sprintf(filename, "%s%s%d/name", iio_dir, |
| 599 | type, number); |
| 600 | if (ret < 0) { |
| 601 | free(filename); |
| 602 | goto error_close_dir; |
| 603 | } |
| 604 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 605 | nameFile = fopen(filename, "r"); |
Peter Meerwald | a4d429e | 2012-06-25 23:13:25 +0200 | [diff] [blame] | 606 | if (!nameFile) { |
| 607 | free(filename); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 608 | continue; |
Peter Meerwald | a4d429e | 2012-06-25 23:13:25 +0200 | [diff] [blame] | 609 | } |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 610 | free(filename); |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 611 | errno = 0; |
| 612 | if (fscanf(nameFile, "%s", thisname) != 1) { |
| 613 | ret = errno ? -errno : -ENODATA; |
| 614 | goto error_close_dir; |
| 615 | } |
| 616 | |
| 617 | if (fclose(nameFile)) { |
| 618 | ret = -errno; |
| 619 | goto error_close_dir; |
| 620 | } |
| 621 | |
Peter Meerwald | a4d429e | 2012-06-25 23:13:25 +0200 | [diff] [blame] | 622 | if (strcmp(name, thisname) == 0) { |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 623 | if (closedir(dp) == -1) |
| 624 | return -errno; |
Peter Meerwald | a4d429e | 2012-06-25 23:13:25 +0200 | [diff] [blame] | 625 | return number; |
| 626 | } |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 627 | } |
| 628 | } |
| 629 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 630 | if (closedir(dp) == -1) |
| 631 | return -errno; |
| 632 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 633 | return -ENODEV; |
Hartmut Knaack | 096f9b8 | 2015-05-31 14:40:00 +0200 | [diff] [blame] | 634 | |
| 635 | error_close_dir: |
| 636 | if (closedir(dp) == -1) |
| 637 | perror("find_type_by_name(): Failed to close directory"); |
| 638 | return ret; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 639 | } |
| 640 | |
Hartmut Knaack | 2156b17 | 2015-05-31 14:40:01 +0200 | [diff] [blame] | 641 | static int _write_sysfs_int(char *filename, char *basedir, int val, int verify) |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 642 | { |
Sebastian Andrzej Siewior | 11cb454 | 2013-10-07 13:42:00 +0100 | [diff] [blame] | 643 | int ret = 0; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 644 | FILE *sysfsfp; |
| 645 | int test; |
| 646 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
Melike Yurtoglu | 79bdd48 | 2014-10-03 23:35:54 +0300 | [diff] [blame] | 647 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 648 | if (temp == NULL) |
| 649 | return -ENOMEM; |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 650 | ret = sprintf(temp, "%s/%s", basedir, filename); |
| 651 | if (ret < 0) |
| 652 | goto error_free; |
| 653 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 654 | sysfsfp = fopen(temp, "w"); |
| 655 | if (sysfsfp == NULL) { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 656 | ret = -errno; |
Hartmut Knaack | 2b6a6e6 | 2015-05-31 14:39:48 +0200 | [diff] [blame] | 657 | printf("failed to open %s\n", temp); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 658 | goto error_free; |
| 659 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 660 | ret = fprintf(sysfsfp, "%d", val); |
| 661 | if (ret < 0) { |
| 662 | if (fclose(sysfsfp)) |
| 663 | perror("_write_sysfs_int(): Failed to close dir"); |
| 664 | |
| 665 | goto error_free; |
| 666 | } |
| 667 | |
| 668 | if (fclose(sysfsfp)) { |
| 669 | ret = -errno; |
| 670 | goto error_free; |
| 671 | } |
| 672 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 673 | if (verify) { |
| 674 | sysfsfp = fopen(temp, "r"); |
| 675 | if (sysfsfp == NULL) { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 676 | ret = -errno; |
Hartmut Knaack | 2b6a6e6 | 2015-05-31 14:39:48 +0200 | [diff] [blame] | 677 | printf("failed to open %s\n", temp); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 678 | goto error_free; |
| 679 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 680 | if (fscanf(sysfsfp, "%d", &test) != 1) { |
| 681 | ret = errno ? -errno : -ENODATA; |
| 682 | if (fclose(sysfsfp)) |
| 683 | perror("_write_sysfs_int(): Failed to close dir"); |
| 684 | |
| 685 | goto error_free; |
| 686 | } |
| 687 | |
| 688 | if (fclose(sysfsfp)) { |
| 689 | ret = -errno; |
| 690 | goto error_free; |
| 691 | } |
| 692 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 693 | if (test != val) { |
| 694 | printf("Possible failure in int write %d to %s%s\n", |
| 695 | val, |
| 696 | basedir, |
| 697 | filename); |
| 698 | ret = -1; |
| 699 | } |
| 700 | } |
| 701 | error_free: |
| 702 | free(temp); |
| 703 | return ret; |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 704 | } |
| 705 | |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 706 | /** |
| 707 | * write_sysfs_int() - write an integer value to a sysfs file |
| 708 | * @filename: name of the file to write to |
| 709 | * @basedir: the sysfs directory in which the file is to be found |
| 710 | * @val: integer value to write to file |
| 711 | * |
| 712 | * Returns a value >= 0 on success, otherwise a negative error code. |
| 713 | **/ |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 714 | int write_sysfs_int(char *filename, char *basedir, int val) |
| 715 | { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 716 | return _write_sysfs_int(filename, basedir, val, 0); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 717 | } |
| 718 | |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 719 | /** |
| 720 | * write_sysfs_int_and_verify() - write an integer value to a sysfs file |
| 721 | * and verify |
| 722 | * @filename: name of the file to write to |
| 723 | * @basedir: the sysfs directory in which the file is to be found |
| 724 | * @val: integer value to write to file |
| 725 | * |
| 726 | * Returns a value >= 0 on success, otherwise a negative error code. |
| 727 | **/ |
Jonathan Cameron | eaf86ff | 2010-05-04 14:43:04 +0100 | [diff] [blame] | 728 | int write_sysfs_int_and_verify(char *filename, char *basedir, int val) |
| 729 | { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 730 | return _write_sysfs_int(filename, basedir, val, 1); |
Jonathan Cameron | eaf86ff | 2010-05-04 14:43:04 +0100 | [diff] [blame] | 731 | } |
| 732 | |
Hartmut Knaack | 2156b17 | 2015-05-31 14:40:01 +0200 | [diff] [blame] | 733 | static int _write_sysfs_string(char *filename, char *basedir, char *val, |
| 734 | int verify) |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 735 | { |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 736 | int ret = 0; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 737 | FILE *sysfsfp; |
| 738 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
Melike Yurtoglu | 79bdd48 | 2014-10-03 23:35:54 +0300 | [diff] [blame] | 739 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 740 | if (temp == NULL) { |
| 741 | printf("Memory allocation failed\n"); |
| 742 | return -ENOMEM; |
| 743 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 744 | ret = sprintf(temp, "%s/%s", basedir, filename); |
| 745 | if (ret < 0) |
| 746 | goto error_free; |
| 747 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 748 | sysfsfp = fopen(temp, "w"); |
| 749 | if (sysfsfp == NULL) { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 750 | ret = -errno; |
Hartmut Knaack | 2b6a6e6 | 2015-05-31 14:39:48 +0200 | [diff] [blame] | 751 | printf("Could not open %s\n", temp); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 752 | goto error_free; |
| 753 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 754 | ret = fprintf(sysfsfp, "%s", val); |
| 755 | if (ret < 0) { |
| 756 | if (fclose(sysfsfp)) |
| 757 | perror("_write_sysfs_string(): Failed to close dir"); |
| 758 | |
| 759 | goto error_free; |
| 760 | } |
| 761 | |
| 762 | if (fclose(sysfsfp)) { |
| 763 | ret = -errno; |
| 764 | goto error_free; |
| 765 | } |
| 766 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 767 | if (verify) { |
| 768 | sysfsfp = fopen(temp, "r"); |
| 769 | if (sysfsfp == NULL) { |
| 770 | ret = -errno; |
Hartmut Knaack | 2b6a6e6 | 2015-05-31 14:39:48 +0200 | [diff] [blame] | 771 | printf("could not open file to verify\n"); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 772 | goto error_free; |
| 773 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 774 | if (fscanf(sysfsfp, "%s", temp) != 1) { |
| 775 | ret = errno ? -errno : -ENODATA; |
| 776 | if (fclose(sysfsfp)) |
| 777 | perror("_write_sysfs_string(): Failed to close dir"); |
| 778 | |
| 779 | goto error_free; |
| 780 | } |
| 781 | |
| 782 | if (fclose(sysfsfp)) { |
| 783 | ret = -errno; |
| 784 | goto error_free; |
| 785 | } |
| 786 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 787 | if (strcmp(temp, val) != 0) { |
| 788 | printf("Possible failure in string write of %s " |
| 789 | "Should be %s " |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 790 | "written to %s\%s\n", |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 791 | temp, |
| 792 | val, |
| 793 | basedir, |
| 794 | filename); |
| 795 | ret = -1; |
| 796 | } |
| 797 | } |
| 798 | error_free: |
| 799 | free(temp); |
| 800 | |
| 801 | return ret; |
| 802 | } |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame] | 803 | |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 804 | /** |
| 805 | * write_sysfs_string_and_verify() - string write, readback and verify |
| 806 | * @filename: name of file to write to |
| 807 | * @basedir: the sysfs directory in which the file is to be found |
| 808 | * @val: the string to write |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 809 | * |
| 810 | * Returns a value >= 0 on success, otherwise a negative error code. |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 811 | **/ |
| 812 | int write_sysfs_string_and_verify(char *filename, char *basedir, char *val) |
| 813 | { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 814 | return _write_sysfs_string(filename, basedir, val, 1); |
| 815 | } |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 816 | |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 817 | /** |
| 818 | * write_sysfs_string() - write string to a sysfs file |
| 819 | * @filename: name of file to write to |
| 820 | * @basedir: the sysfs directory in which the file is to be found |
| 821 | * @val: the string to write |
| 822 | * |
| 823 | * Returns a value >= 0 on success, otherwise a negative error code. |
| 824 | **/ |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 825 | int write_sysfs_string(char *filename, char *basedir, char *val) |
| 826 | { |
| 827 | return _write_sysfs_string(filename, basedir, val, 0); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 828 | } |
| 829 | |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 830 | /** |
| 831 | * read_sysfs_posint() - read an integer value from file |
| 832 | * @filename: name of file to read from |
| 833 | * @basedir: the sysfs directory in which the file is to be found |
| 834 | * |
| 835 | * Returns the read integer value >= 0 on success, otherwise a negative error |
| 836 | * code. |
| 837 | **/ |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 838 | int read_sysfs_posint(char *filename, char *basedir) |
| 839 | { |
| 840 | int ret; |
| 841 | FILE *sysfsfp; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 842 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
Melike Yurtoglu | 79bdd48 | 2014-10-03 23:35:54 +0300 | [diff] [blame] | 843 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 844 | if (temp == NULL) { |
| 845 | printf("Memory allocation failed"); |
| 846 | return -ENOMEM; |
| 847 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 848 | ret = sprintf(temp, "%s/%s", basedir, filename); |
| 849 | if (ret < 0) |
| 850 | goto error_free; |
| 851 | |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 852 | sysfsfp = fopen(temp, "r"); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 853 | if (sysfsfp == NULL) { |
| 854 | ret = -errno; |
| 855 | goto error_free; |
| 856 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 857 | errno = 0; |
| 858 | if (fscanf(sysfsfp, "%d\n", &ret) != 1) { |
| 859 | ret = errno ? -errno : -ENODATA; |
| 860 | if (fclose(sysfsfp)) |
| 861 | perror("read_sysfs_posint(): Failed to close dir"); |
| 862 | |
| 863 | goto error_free; |
| 864 | } |
| 865 | |
| 866 | if (fclose(sysfsfp)) |
| 867 | ret = -errno; |
| 868 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 869 | error_free: |
| 870 | free(temp); |
| 871 | return ret; |
| 872 | } |
| 873 | |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 874 | /** |
| 875 | * read_sysfs_float() - read a float value from file |
| 876 | * @filename: name of file to read from |
| 877 | * @basedir: the sysfs directory in which the file is to be found |
| 878 | * @val: output the read float value |
| 879 | * |
| 880 | * Returns a value >= 0 on success, otherwise a negative error code. |
| 881 | **/ |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 882 | int read_sysfs_float(char *filename, char *basedir, float *val) |
| 883 | { |
Peter Meerwald | f5709d5 | 2014-12-06 06:00:00 +0000 | [diff] [blame] | 884 | int ret = 0; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 885 | FILE *sysfsfp; |
| 886 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
Melike Yurtoglu | 79bdd48 | 2014-10-03 23:35:54 +0300 | [diff] [blame] | 887 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 888 | if (temp == NULL) { |
| 889 | printf("Memory allocation failed"); |
| 890 | return -ENOMEM; |
| 891 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 892 | ret = sprintf(temp, "%s/%s", basedir, filename); |
| 893 | if (ret < 0) |
| 894 | goto error_free; |
| 895 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 896 | sysfsfp = fopen(temp, "r"); |
| 897 | if (sysfsfp == NULL) { |
| 898 | ret = -errno; |
| 899 | goto error_free; |
| 900 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 901 | errno = 0; |
| 902 | if (fscanf(sysfsfp, "%f\n", val) != 1) { |
| 903 | ret = errno ? -errno : -ENODATA; |
| 904 | if (fclose(sysfsfp)) |
| 905 | perror("read_sysfs_float(): Failed to close dir"); |
| 906 | |
| 907 | goto error_free; |
| 908 | } |
| 909 | |
| 910 | if (fclose(sysfsfp)) |
| 911 | ret = -errno; |
| 912 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 913 | error_free: |
| 914 | free(temp); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 915 | return ret; |
| 916 | } |
Manuel Stahl | 49d916e | 2014-05-02 13:23:00 +0100 | [diff] [blame] | 917 | |
Hartmut Knaack | 5dc65d7 | 2015-05-31 14:40:16 +0200 | [diff] [blame] | 918 | /** |
| 919 | * read_sysfs_string() - read a string from file |
| 920 | * @filename: name of file to read from |
| 921 | * @basedir: the sysfs directory in which the file is to be found |
| 922 | * @str: output the read string |
| 923 | * |
| 924 | * Returns a value >= 0 on success, otherwise a negative error code. |
| 925 | **/ |
Peter Meerwald | f5709d5 | 2014-12-06 06:00:00 +0000 | [diff] [blame] | 926 | int read_sysfs_string(const char *filename, const char *basedir, char *str) |
Manuel Stahl | 49d916e | 2014-05-02 13:23:00 +0100 | [diff] [blame] | 927 | { |
Peter Meerwald | f5709d5 | 2014-12-06 06:00:00 +0000 | [diff] [blame] | 928 | int ret = 0; |
Manuel Stahl | 49d916e | 2014-05-02 13:23:00 +0100 | [diff] [blame] | 929 | FILE *sysfsfp; |
| 930 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
Melike Yurtoglu | 79bdd48 | 2014-10-03 23:35:54 +0300 | [diff] [blame] | 931 | |
Manuel Stahl | 49d916e | 2014-05-02 13:23:00 +0100 | [diff] [blame] | 932 | if (temp == NULL) { |
| 933 | printf("Memory allocation failed"); |
| 934 | return -ENOMEM; |
| 935 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 936 | ret = sprintf(temp, "%s/%s", basedir, filename); |
| 937 | if (ret < 0) |
| 938 | goto error_free; |
| 939 | |
Manuel Stahl | 49d916e | 2014-05-02 13:23:00 +0100 | [diff] [blame] | 940 | sysfsfp = fopen(temp, "r"); |
| 941 | if (sysfsfp == NULL) { |
| 942 | ret = -errno; |
| 943 | goto error_free; |
| 944 | } |
Hartmut Knaack | 5311855 | 2015-05-31 14:40:14 +0200 | [diff] [blame] | 945 | errno = 0; |
| 946 | if (fscanf(sysfsfp, "%s\n", str) != 1) { |
| 947 | ret = errno ? -errno : -ENODATA; |
| 948 | if (fclose(sysfsfp)) |
| 949 | perror("read_sysfs_string(): Failed to close dir"); |
| 950 | |
| 951 | goto error_free; |
| 952 | } |
| 953 | |
| 954 | if (fclose(sysfsfp)) |
| 955 | ret = -errno; |
| 956 | |
Manuel Stahl | 49d916e | 2014-05-02 13:23:00 +0100 | [diff] [blame] | 957 | error_free: |
| 958 | free(temp); |
| 959 | return ret; |
| 960 | } |
Cristina Opriceana | 37e3be9 | 2015-03-04 02:37:15 +0200 | [diff] [blame] | 961 | |
| 962 | #endif /* _IIO_UTILS_H */ |