Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) 2011 David George <david.george@ska.ac.za> * * based on adm1021.c * some credit to Christoph Scheurer, but largely a rewrite */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> /* Addresses to scan */ static const unsigned short max1668_addr_list[] = { 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; /* max1668 registers */ #define MAX1668_REG_TEMP(nr) (nr) #define MAX1668_REG_STAT1 0x05 #define MAX1668_REG_STAT2 0x06 #define MAX1668_REG_MAN_ID 0xfe #define MAX1668_REG_DEV_ID 0xff /* limits */ /* write high limits */ #define MAX1668_REG_LIMH_WR(nr) (0x13 + 2 * (nr)) /* write low limits */ #define MAX1668_REG_LIML_WR(nr) (0x14 + 2 * (nr)) /* read high limits */ #define MAX1668_REG_LIMH_RD(nr) (0x08 + 2 * (nr)) /* read low limits */ #define MAX1668_REG_LIML_RD(nr) (0x09 + 2 * (nr)) /* manufacturer and device ID Constants */ #define MAN_ID_MAXIM 0x4d #define DEV_ID_MAX1668 0x3 #define DEV_ID_MAX1805 0x5 #define DEV_ID_MAX1989 0xb /* read only mode module parameter */ static bool read_only; module_param(read_only, bool, 0); MODULE_PARM_DESC(read_only, "Don't set any values, read only mode"); enum chips { max1668, max1805, max1989 }; struct max1668_data { struct i2c_client *client; const struct attribute_group *groups[3]; enum chips type; struct mutex update_lock; bool valid; /* true if following fields are valid */ unsigned long last_updated; /* In jiffies */ /* 1x local and 4x remote */ s8 temp_max[5]; s8 temp_min[5]; s8 temp[5]; u16 alarms; }; static struct max1668_data *max1668_update_device(struct device *dev) { struct max1668_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; struct max1668_data *ret = data; s32 val; int i; mutex_lock(&data->update_lock); if (data->valid && !time_after(jiffies, data->last_updated + HZ + HZ / 2)) goto abort; for (i = 0; i < 5; i++) { val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i)); if (unlikely(val < 0)) { ret = ERR_PTR(val); goto abort; } data->temp[i] = (s8) val; val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i)); if (unlikely(val < 0)) { ret = ERR_PTR(val); goto abort; } data->temp_max[i] = (s8) val; val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i)); if (unlikely(val < 0)) { ret = ERR_PTR(val); goto abort; } data->temp_min[i] = (s8) val; } val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1); if (unlikely(val < 0)) { ret = ERR_PTR(val); goto abort; } data->alarms = val << 8; val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2); if (unlikely(val < 0)) { ret = ERR_PTR(val); goto abort; } data->alarms |= val; data->last_updated = jiffies; data->valid = true; abort: mutex_unlock(&data->update_lock); return ret; } static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct max1668_data *data = max1668_update_device(dev); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%d\n", data->temp[index] * 1000); } static ssize_t show_temp_max(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct max1668_data *data = max1668_update_device(dev); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%d\n", data->temp_max[index] * 1000); } static ssize_t show_temp_min(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct max1668_data *data = max1668_update_device(dev); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%d\n", data->temp_min[index] * 1000); } static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, char *buf) { int index = to_sensor_dev_attr(attr)->index; struct max1668_data *data = max1668_update_device(dev); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1); } static ssize_t show_fault(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; struct max1668_data *data = max1668_update_device(dev); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%u\n", (data->alarms & (1 << 12)) && data->temp[index] == 127); } static ssize_t set_temp_max(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { int index = to_sensor_dev_attr(devattr)->index; struct max1668_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; long temp; int ret; ret = kstrtol(buf, 10, &temp); if (ret < 0) return ret; mutex_lock(&data->update_lock); data->temp_max[index] = clamp_val(temp/1000, -128, 127); ret = i2c_smbus_write_byte_data(client, MAX1668_REG_LIMH_WR(index), data->temp_max[index]); if (ret < 0) count = ret; mutex_unlock(&data->update_lock); return count; } static ssize_t set_temp_min(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { int index = to_sensor_dev_attr(devattr)->index; struct max1668_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; long temp; int ret; ret = kstrtol(buf, 10, &temp); if (ret < 0) return ret; mutex_lock(&data->update_lock); data->temp_min[index] = clamp_val(temp/1000, -128, 127); ret = i2c_smbus_write_byte_data(client, MAX1668_REG_LIML_WR(index), data->temp_min[index]); if (ret < 0) count = ret; mutex_unlock(&data->update_lock); return count; } static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, set_temp_max, 0); static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min, set_temp_min, 0); static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, set_temp_max, 1); static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min, set_temp_min, 1); static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, set_temp_max, 2); static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min, set_temp_min, 2); static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, set_temp_max, 3); static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min, set_temp_min, 3); static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, set_temp_max, 4); static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min, set_temp_min, 4); static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14); static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13); static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7); static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6); static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5); static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4); static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3); static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2); static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1); static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0); static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1); static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2); static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3); static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_fault, NULL, 4); /* Attributes common to MAX1668, MAX1989 and MAX1805 */ static struct attribute *max1668_attribute_common[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp2_min.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp3_max.dev_attr.attr, &sensor_dev_attr_temp3_min.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_fault.dev_attr.attr, &sensor_dev_attr_temp3_fault.dev_attr.attr, NULL }; /* Attributes not present on MAX1805 */ static struct attribute *max1668_attribute_unique[] = { &sensor_dev_attr_temp4_max.dev_attr.attr, &sensor_dev_attr_temp4_min.dev_attr.attr, &sensor_dev_attr_temp4_input.dev_attr.attr, &sensor_dev_attr_temp5_max.dev_attr.attr, &sensor_dev_attr_temp5_min.dev_attr.attr, &sensor_dev_attr_temp5_input.dev_attr.attr, &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, &sensor_dev_attr_temp4_min_alarm.dev_attr.attr, &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, &sensor_dev_attr_temp5_min_alarm.dev_attr.attr, &sensor_dev_attr_temp4_fault.dev_attr.attr, &sensor_dev_attr_temp5_fault.dev_attr.attr, NULL }; static umode_t max1668_attribute_mode(struct kobject *kobj, struct attribute *attr, int index) { umode_t ret = S_IRUGO; if (read_only) return ret; if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr || attr == &sensor_dev_attr_temp2_max.dev_attr.attr || attr == &sensor_dev_attr_temp3_max.dev_attr.attr || attr == &sensor_dev_attr_temp4_max.dev_attr.attr || attr == &sensor_dev_attr_temp5_max.dev_attr.attr || attr == &sensor_dev_attr_temp1_min.dev_attr.attr || attr == &sensor_dev_attr_temp2_min.dev_attr.attr || attr == &sensor_dev_attr_temp3_min.dev_attr.attr || attr == &sensor_dev_attr_temp4_min.dev_attr.attr || attr == &sensor_dev_attr_temp5_min.dev_attr.attr) ret |= S_IWUSR; return ret; } static const struct attribute_group max1668_group_common = { .attrs = max1668_attribute_common, .is_visible = max1668_attribute_mode }; static const struct attribute_group max1668_group_unique = { .attrs = max1668_attribute_unique, .is_visible = max1668_attribute_mode }; /* Return 0 if detection is successful, -ENODEV otherwise */ static int max1668_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; const char *type_name; int man_id, dev_id; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV; /* Check for unsupported part */ man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID); if (man_id != MAN_ID_MAXIM) return -ENODEV; dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID); if (dev_id < 0) return -ENODEV; type_name = NULL; if (dev_id == DEV_ID_MAX1668) type_name = "max1668"; else if (dev_id == DEV_ID_MAX1805) type_name = "max1805"; else if (dev_id == DEV_ID_MAX1989) type_name = "max1989"; if (!type_name) return -ENODEV; strscpy(info->type, type_name, I2C_NAME_SIZE); return 0; } static const struct i2c_device_id max1668_id[]; static int max1668_probe(struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; struct device *dev = &client->dev; struct device *hwmon_dev; struct max1668_data *data; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV; data = devm_kzalloc(dev, sizeof(struct max1668_data), GFP_KERNEL); if (!data) return -ENOMEM; data->client = client; data->type = i2c_match_id(max1668_id, client)->driver_data; mutex_init(&data->update_lock); /* sysfs hooks */ data->groups[0] = &max1668_group_common; if (data->type == max1668 || data->type == max1989) data->groups[1] = &max1668_group_unique; hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, data->groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id max1668_id[] = { { "max1668", max1668 }, { "max1805", max1805 }, { "max1989", max1989 }, { } }; MODULE_DEVICE_TABLE(i2c, max1668_id); /* This is the driver that will be inserted */ static struct i2c_driver max1668_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "max1668", }, .probe_new = max1668_probe, .id_table = max1668_id, .detect = max1668_detect, .address_list = max1668_addr_list, }; module_i2c_driver(max1668_driver); MODULE_AUTHOR("David George <david.george@ska.ac.za>"); MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver"); MODULE_LICENSE("GPL"); |