1 /* 2 * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net> 3 * 4 * based on max1668.c 5 * Copyright (c) 2011 David George <david.george@ska.ac.za> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/slab.h> 21 #include <linux/jiffies.h> 22 #include <linux/i2c.h> 23 #include <linux/hwmon.h> 24 #include <linux/hwmon-sysfs.h> 25 #include <linux/err.h> 26 #include <linux/mutex.h> 27 #include <linux/of_device.h> 28 #include <linux/of.h> 29 30 #include <linux/platform_data/max6697.h> 31 32 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694, 33 max6697, max6698, max6699 }; 34 35 /* Report local sensor as temp1 */ 36 37 static const u8 MAX6697_REG_TEMP[] = { 38 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 }; 39 static const u8 MAX6697_REG_TEMP_EXT[] = { 40 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 }; 41 static const u8 MAX6697_REG_MAX[] = { 42 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 }; 43 static const u8 MAX6697_REG_CRIT[] = { 44 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 }; 45 46 /* 47 * Map device tree / platform data register bit map to chip bit map. 48 * Applies to alert register and over-temperature register. 49 */ 50 #define MAX6697_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \ 51 (((reg) & 0x01) << 6) | ((reg) & 0x80)) 52 53 #define MAX6697_REG_STAT(n) (0x44 + (n)) 54 55 #define MAX6697_REG_CONFIG 0x41 56 #define MAX6581_CONF_EXTENDED (1 << 1) 57 #define MAX6693_CONF_BETA (1 << 2) 58 #define MAX6697_CONF_RESISTANCE (1 << 3) 59 #define MAX6697_CONF_TIMEOUT (1 << 5) 60 #define MAX6697_REG_ALERT_MASK 0x42 61 #define MAX6697_REG_OVERT_MASK 0x43 62 63 #define MAX6581_REG_RESISTANCE 0x4a 64 #define MAX6581_REG_IDEALITY 0x4b 65 #define MAX6581_REG_IDEALITY_SELECT 0x4c 66 #define MAX6581_REG_OFFSET 0x4d 67 #define MAX6581_REG_OFFSET_SELECT 0x4e 68 69 #define MAX6697_CONV_TIME 156 /* ms per channel, worst case */ 70 71 struct max6697_chip_data { 72 int channels; 73 u32 have_ext; 74 u32 have_crit; 75 u32 have_fault; 76 u8 valid_conf; 77 const u8 *alarm_map; 78 }; 79 80 struct max6697_data { 81 struct i2c_client *client; 82 83 enum chips type; 84 const struct max6697_chip_data *chip; 85 86 int update_interval; /* in milli-seconds */ 87 int temp_offset; /* in degrees C */ 88 89 struct mutex update_lock; 90 unsigned long last_updated; /* In jiffies */ 91 bool valid; /* true if following fields are valid */ 92 93 /* 1x local and up to 7x remote */ 94 u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */ 95 #define MAX6697_TEMP_INPUT 0 96 #define MAX6697_TEMP_EXT 1 97 #define MAX6697_TEMP_MAX 2 98 #define MAX6697_TEMP_CRIT 3 99 u32 alarms; 100 }; 101 102 /* Diode fault status bits on MAX6581 are right shifted by one bit */ 103 static const u8 max6581_alarm_map[] = { 104 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 105 16, 17, 18, 19, 20, 21, 22, 23 }; 106 107 static const struct max6697_chip_data max6697_chip_data[] = { 108 [max6581] = { 109 .channels = 8, 110 .have_crit = 0xff, 111 .have_ext = 0x7f, 112 .have_fault = 0xfe, 113 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT, 114 .alarm_map = max6581_alarm_map, 115 }, 116 [max6602] = { 117 .channels = 5, 118 .have_crit = 0x12, 119 .have_ext = 0x02, 120 .have_fault = 0x1e, 121 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 122 }, 123 [max6622] = { 124 .channels = 5, 125 .have_crit = 0x12, 126 .have_ext = 0x02, 127 .have_fault = 0x1e, 128 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 129 }, 130 [max6636] = { 131 .channels = 7, 132 .have_crit = 0x72, 133 .have_ext = 0x02, 134 .have_fault = 0x7e, 135 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 136 }, 137 [max6689] = { 138 .channels = 7, 139 .have_crit = 0x72, 140 .have_ext = 0x02, 141 .have_fault = 0x7e, 142 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 143 }, 144 [max6693] = { 145 .channels = 7, 146 .have_crit = 0x72, 147 .have_ext = 0x02, 148 .have_fault = 0x7e, 149 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA | 150 MAX6697_CONF_TIMEOUT, 151 }, 152 [max6694] = { 153 .channels = 5, 154 .have_crit = 0x12, 155 .have_ext = 0x02, 156 .have_fault = 0x1e, 157 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA | 158 MAX6697_CONF_TIMEOUT, 159 }, 160 [max6697] = { 161 .channels = 7, 162 .have_crit = 0x72, 163 .have_ext = 0x02, 164 .have_fault = 0x7e, 165 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 166 }, 167 [max6698] = { 168 .channels = 7, 169 .have_crit = 0x72, 170 .have_ext = 0x02, 171 .have_fault = 0x0e, 172 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 173 }, 174 [max6699] = { 175 .channels = 5, 176 .have_crit = 0x12, 177 .have_ext = 0x02, 178 .have_fault = 0x1e, 179 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 180 }, 181 }; 182 183 static struct max6697_data *max6697_update_device(struct device *dev) 184 { 185 struct max6697_data *data = dev_get_drvdata(dev); 186 struct i2c_client *client = data->client; 187 struct max6697_data *ret = data; 188 int val; 189 int i; 190 u32 alarms; 191 192 mutex_lock(&data->update_lock); 193 194 if (data->valid && 195 !time_after(jiffies, data->last_updated 196 + msecs_to_jiffies(data->update_interval))) 197 goto abort; 198 199 for (i = 0; i < data->chip->channels; i++) { 200 if (data->chip->have_ext & (1 << i)) { 201 val = i2c_smbus_read_byte_data(client, 202 MAX6697_REG_TEMP_EXT[i]); 203 if (unlikely(val < 0)) { 204 ret = ERR_PTR(val); 205 goto abort; 206 } 207 data->temp[i][MAX6697_TEMP_EXT] = val; 208 } 209 210 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]); 211 if (unlikely(val < 0)) { 212 ret = ERR_PTR(val); 213 goto abort; 214 } 215 data->temp[i][MAX6697_TEMP_INPUT] = val; 216 217 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]); 218 if (unlikely(val < 0)) { 219 ret = ERR_PTR(val); 220 goto abort; 221 } 222 data->temp[i][MAX6697_TEMP_MAX] = val; 223 224 if (data->chip->have_crit & (1 << i)) { 225 val = i2c_smbus_read_byte_data(client, 226 MAX6697_REG_CRIT[i]); 227 if (unlikely(val < 0)) { 228 ret = ERR_PTR(val); 229 goto abort; 230 } 231 data->temp[i][MAX6697_TEMP_CRIT] = val; 232 } 233 } 234 235 alarms = 0; 236 for (i = 0; i < 3; i++) { 237 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i)); 238 if (unlikely(val < 0)) { 239 ret = ERR_PTR(val); 240 goto abort; 241 } 242 alarms = (alarms << 8) | val; 243 } 244 data->alarms = alarms; 245 data->last_updated = jiffies; 246 data->valid = true; 247 abort: 248 mutex_unlock(&data->update_lock); 249 250 return ret; 251 } 252 253 static ssize_t show_temp_input(struct device *dev, 254 struct device_attribute *devattr, char *buf) 255 { 256 int index = to_sensor_dev_attr(devattr)->index; 257 struct max6697_data *data = max6697_update_device(dev); 258 int temp; 259 260 if (IS_ERR(data)) 261 return PTR_ERR(data); 262 263 temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3; 264 temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5; 265 266 return sprintf(buf, "%d\n", temp * 125); 267 } 268 269 static ssize_t show_temp(struct device *dev, 270 struct device_attribute *devattr, char *buf) 271 { 272 int nr = to_sensor_dev_attr_2(devattr)->nr; 273 int index = to_sensor_dev_attr_2(devattr)->index; 274 struct max6697_data *data = max6697_update_device(dev); 275 int temp; 276 277 if (IS_ERR(data)) 278 return PTR_ERR(data); 279 280 temp = data->temp[nr][index]; 281 temp -= data->temp_offset; 282 283 return sprintf(buf, "%d\n", temp * 1000); 284 } 285 286 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 287 char *buf) 288 { 289 int index = to_sensor_dev_attr(attr)->index; 290 struct max6697_data *data = max6697_update_device(dev); 291 292 if (IS_ERR(data)) 293 return PTR_ERR(data); 294 295 if (data->chip->alarm_map) 296 index = data->chip->alarm_map[index]; 297 298 return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1); 299 } 300 301 static ssize_t set_temp(struct device *dev, 302 struct device_attribute *devattr, 303 const char *buf, size_t count) 304 { 305 int nr = to_sensor_dev_attr_2(devattr)->nr; 306 int index = to_sensor_dev_attr_2(devattr)->index; 307 struct max6697_data *data = dev_get_drvdata(dev); 308 long temp; 309 int ret; 310 311 ret = kstrtol(buf, 10, &temp); 312 if (ret < 0) 313 return ret; 314 315 mutex_lock(&data->update_lock); 316 temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset; 317 temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127); 318 data->temp[nr][index] = temp; 319 ret = i2c_smbus_write_byte_data(data->client, 320 index == 2 ? MAX6697_REG_MAX[nr] 321 : MAX6697_REG_CRIT[nr], 322 temp); 323 mutex_unlock(&data->update_lock); 324 325 return ret < 0 ? ret : count; 326 } 327 328 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0); 329 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 330 0, MAX6697_TEMP_MAX); 331 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 332 0, MAX6697_TEMP_CRIT); 333 334 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1); 335 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 336 1, MAX6697_TEMP_MAX); 337 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 338 1, MAX6697_TEMP_CRIT); 339 340 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2); 341 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 342 2, MAX6697_TEMP_MAX); 343 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 344 2, MAX6697_TEMP_CRIT); 345 346 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3); 347 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 348 3, MAX6697_TEMP_MAX); 349 static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 350 3, MAX6697_TEMP_CRIT); 351 352 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4); 353 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 354 4, MAX6697_TEMP_MAX); 355 static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 356 4, MAX6697_TEMP_CRIT); 357 358 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5); 359 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 360 5, MAX6697_TEMP_MAX); 361 static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 362 5, MAX6697_TEMP_CRIT); 363 364 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6); 365 static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 366 6, MAX6697_TEMP_MAX); 367 static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 368 6, MAX6697_TEMP_CRIT); 369 370 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7); 371 static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 372 7, MAX6697_TEMP_MAX); 373 static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp, 374 7, MAX6697_TEMP_CRIT); 375 376 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22); 377 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16); 378 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17); 379 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18); 380 static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19); 381 static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20); 382 static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21); 383 static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23); 384 385 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14); 386 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8); 387 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9); 388 static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10); 389 static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11); 390 static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12); 391 static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13); 392 static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15); 393 394 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1); 395 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2); 396 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3); 397 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4); 398 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5); 399 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6); 400 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7); 401 402 static DEVICE_ATTR(dummy, 0, NULL, NULL); 403 404 static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr, 405 int index) 406 { 407 struct device *dev = container_of(kobj, struct device, kobj); 408 struct max6697_data *data = dev_get_drvdata(dev); 409 const struct max6697_chip_data *chip = data->chip; 410 int channel = index / 6; /* channel number */ 411 int nr = index % 6; /* attribute index within channel */ 412 413 if (channel >= chip->channels) 414 return 0; 415 416 if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel))) 417 return 0; 418 if (nr == 5 && !(chip->have_fault & (1 << channel))) 419 return 0; 420 421 return attr->mode; 422 } 423 424 /* 425 * max6697_is_visible uses the index into the following array to determine 426 * if attributes should be created or not. Any change in order or content 427 * must be matched in max6697_is_visible. 428 */ 429 static struct attribute *max6697_attributes[] = { 430 &sensor_dev_attr_temp1_input.dev_attr.attr, 431 &sensor_dev_attr_temp1_max.dev_attr.attr, 432 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 433 &sensor_dev_attr_temp1_crit.dev_attr.attr, 434 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 435 &dev_attr_dummy.attr, 436 437 &sensor_dev_attr_temp2_input.dev_attr.attr, 438 &sensor_dev_attr_temp2_max.dev_attr.attr, 439 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 440 &sensor_dev_attr_temp2_crit.dev_attr.attr, 441 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 442 &sensor_dev_attr_temp2_fault.dev_attr.attr, 443 444 &sensor_dev_attr_temp3_input.dev_attr.attr, 445 &sensor_dev_attr_temp3_max.dev_attr.attr, 446 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, 447 &sensor_dev_attr_temp3_crit.dev_attr.attr, 448 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, 449 &sensor_dev_attr_temp3_fault.dev_attr.attr, 450 451 &sensor_dev_attr_temp4_input.dev_attr.attr, 452 &sensor_dev_attr_temp4_max.dev_attr.attr, 453 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, 454 &sensor_dev_attr_temp4_crit.dev_attr.attr, 455 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr, 456 &sensor_dev_attr_temp4_fault.dev_attr.attr, 457 458 &sensor_dev_attr_temp5_input.dev_attr.attr, 459 &sensor_dev_attr_temp5_max.dev_attr.attr, 460 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, 461 &sensor_dev_attr_temp5_crit.dev_attr.attr, 462 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr, 463 &sensor_dev_attr_temp5_fault.dev_attr.attr, 464 465 &sensor_dev_attr_temp6_input.dev_attr.attr, 466 &sensor_dev_attr_temp6_max.dev_attr.attr, 467 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr, 468 &sensor_dev_attr_temp6_crit.dev_attr.attr, 469 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr, 470 &sensor_dev_attr_temp6_fault.dev_attr.attr, 471 472 &sensor_dev_attr_temp7_input.dev_attr.attr, 473 &sensor_dev_attr_temp7_max.dev_attr.attr, 474 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr, 475 &sensor_dev_attr_temp7_crit.dev_attr.attr, 476 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr, 477 &sensor_dev_attr_temp7_fault.dev_attr.attr, 478 479 &sensor_dev_attr_temp8_input.dev_attr.attr, 480 &sensor_dev_attr_temp8_max.dev_attr.attr, 481 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr, 482 &sensor_dev_attr_temp8_crit.dev_attr.attr, 483 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr, 484 &sensor_dev_attr_temp8_fault.dev_attr.attr, 485 NULL 486 }; 487 488 static const struct attribute_group max6697_group = { 489 .attrs = max6697_attributes, .is_visible = max6697_is_visible, 490 }; 491 __ATTRIBUTE_GROUPS(max6697); 492 493 static void max6697_get_config_of(struct device_node *node, 494 struct max6697_platform_data *pdata) 495 { 496 int len; 497 const __be32 *prop; 498 499 pdata->smbus_timeout_disable = 500 of_property_read_bool(node, "smbus-timeout-disable"); 501 pdata->extended_range_enable = 502 of_property_read_bool(node, "extended-range-enable"); 503 pdata->beta_compensation = 504 of_property_read_bool(node, "beta-compensation-enable"); 505 506 prop = of_get_property(node, "alert-mask", &len); 507 if (prop && len == sizeof(u32)) 508 pdata->alert_mask = be32_to_cpu(prop[0]); 509 prop = of_get_property(node, "over-temperature-mask", &len); 510 if (prop && len == sizeof(u32)) 511 pdata->over_temperature_mask = be32_to_cpu(prop[0]); 512 prop = of_get_property(node, "resistance-cancellation", &len); 513 if (prop) { 514 if (len == sizeof(u32)) 515 pdata->resistance_cancellation = be32_to_cpu(prop[0]); 516 else 517 pdata->resistance_cancellation = 0xfe; 518 } 519 prop = of_get_property(node, "transistor-ideality", &len); 520 if (prop && len == 2 * sizeof(u32)) { 521 pdata->ideality_mask = be32_to_cpu(prop[0]); 522 pdata->ideality_value = be32_to_cpu(prop[1]); 523 } 524 } 525 526 static int max6697_init_chip(struct max6697_data *data, 527 struct i2c_client *client) 528 { 529 struct max6697_platform_data *pdata = dev_get_platdata(&client->dev); 530 struct max6697_platform_data p; 531 const struct max6697_chip_data *chip = data->chip; 532 int factor = chip->channels; 533 int ret, reg; 534 535 /* 536 * Don't touch configuration if neither platform data nor OF 537 * configuration was specified. If that is the case, use the 538 * current chip configuration. 539 */ 540 if (!pdata && !client->dev.of_node) { 541 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG); 542 if (reg < 0) 543 return reg; 544 if (data->type == max6581) { 545 if (reg & MAX6581_CONF_EXTENDED) 546 data->temp_offset = 64; 547 reg = i2c_smbus_read_byte_data(client, 548 MAX6581_REG_RESISTANCE); 549 if (reg < 0) 550 return reg; 551 factor += hweight8(reg); 552 } else { 553 if (reg & MAX6697_CONF_RESISTANCE) 554 factor++; 555 } 556 goto done; 557 } 558 559 if (client->dev.of_node) { 560 memset(&p, 0, sizeof(p)); 561 max6697_get_config_of(client->dev.of_node, &p); 562 pdata = &p; 563 } 564 565 reg = 0; 566 if (pdata->smbus_timeout_disable && 567 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) { 568 reg |= MAX6697_CONF_TIMEOUT; 569 } 570 if (pdata->extended_range_enable && 571 (chip->valid_conf & MAX6581_CONF_EXTENDED)) { 572 reg |= MAX6581_CONF_EXTENDED; 573 data->temp_offset = 64; 574 } 575 if (pdata->resistance_cancellation && 576 (chip->valid_conf & MAX6697_CONF_RESISTANCE)) { 577 reg |= MAX6697_CONF_RESISTANCE; 578 factor++; 579 } 580 if (pdata->beta_compensation && 581 (chip->valid_conf & MAX6693_CONF_BETA)) { 582 reg |= MAX6693_CONF_BETA; 583 } 584 585 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg); 586 if (ret < 0) 587 return ret; 588 589 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK, 590 MAX6697_MAP_BITS(pdata->alert_mask)); 591 if (ret < 0) 592 return ret; 593 594 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK, 595 MAX6697_MAP_BITS(pdata->over_temperature_mask)); 596 if (ret < 0) 597 return ret; 598 599 if (data->type == max6581) { 600 factor += hweight8(pdata->resistance_cancellation >> 1); 601 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE, 602 pdata->resistance_cancellation >> 1); 603 if (ret < 0) 604 return ret; 605 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY, 606 pdata->ideality_value); 607 if (ret < 0) 608 return ret; 609 ret = i2c_smbus_write_byte_data(client, 610 MAX6581_REG_IDEALITY_SELECT, 611 pdata->ideality_mask >> 1); 612 if (ret < 0) 613 return ret; 614 } 615 done: 616 data->update_interval = factor * MAX6697_CONV_TIME; 617 return 0; 618 } 619 620 static int max6697_probe(struct i2c_client *client, 621 const struct i2c_device_id *id) 622 { 623 struct i2c_adapter *adapter = client->adapter; 624 struct device *dev = &client->dev; 625 struct max6697_data *data; 626 struct device *hwmon_dev; 627 int err; 628 629 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 630 return -ENODEV; 631 632 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL); 633 if (!data) 634 return -ENOMEM; 635 636 if (client->dev.of_node) 637 data->type = (enum chips)of_device_get_match_data(&client->dev); 638 else 639 data->type = id->driver_data; 640 data->chip = &max6697_chip_data[data->type]; 641 data->client = client; 642 mutex_init(&data->update_lock); 643 644 err = max6697_init_chip(data, client); 645 if (err) 646 return err; 647 648 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 649 data, 650 max6697_groups); 651 return PTR_ERR_OR_ZERO(hwmon_dev); 652 } 653 654 static const struct i2c_device_id max6697_id[] = { 655 { "max6581", max6581 }, 656 { "max6602", max6602 }, 657 { "max6622", max6622 }, 658 { "max6636", max6636 }, 659 { "max6689", max6689 }, 660 { "max6693", max6693 }, 661 { "max6694", max6694 }, 662 { "max6697", max6697 }, 663 { "max6698", max6698 }, 664 { "max6699", max6699 }, 665 { } 666 }; 667 MODULE_DEVICE_TABLE(i2c, max6697_id); 668 669 static const struct of_device_id max6697_of_match[] = { 670 { 671 .compatible = "maxim,max6581", 672 .data = (void *)max6581 673 }, 674 { 675 .compatible = "maxim,max6602", 676 .data = (void *)max6602 677 }, 678 { 679 .compatible = "maxim,max6622", 680 .data = (void *)max6622 681 }, 682 { 683 .compatible = "maxim,max6636", 684 .data = (void *)max6636 685 }, 686 { 687 .compatible = "maxim,max6689", 688 .data = (void *)max6689 689 }, 690 { 691 .compatible = "maxim,max6693", 692 .data = (void *)max6693 693 }, 694 { 695 .compatible = "maxim,max6694", 696 .data = (void *)max6694 697 }, 698 { 699 .compatible = "maxim,max6697", 700 .data = (void *)max6697 701 }, 702 { 703 .compatible = "maxim,max6698", 704 .data = (void *)max6698 705 }, 706 { 707 .compatible = "maxim,max6699", 708 .data = (void *)max6699 709 }, 710 { }, 711 }; 712 MODULE_DEVICE_TABLE(of, max6697_of_match); 713 714 static struct i2c_driver max6697_driver = { 715 .class = I2C_CLASS_HWMON, 716 .driver = { 717 .name = "max6697", 718 .of_match_table = of_match_ptr(max6697_of_match), 719 }, 720 .probe = max6697_probe, 721 .id_table = max6697_id, 722 }; 723 724 module_i2c_driver(max6697_driver); 725 726 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 727 MODULE_DESCRIPTION("MAX6697 temperature sensor driver"); 728 MODULE_LICENSE("GPL"); 729