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.h> 28 29 #include <linux/platform_data/max6697.h> 30 31 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694, 32 max6697, max6698, max6699 }; 33 34 /* Report local sensor as temp1 */ 35 36 static const u8 MAX6697_REG_TEMP[] = { 37 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 }; 38 static const u8 MAX6697_REG_TEMP_EXT[] = { 39 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 }; 40 static const u8 MAX6697_REG_MAX[] = { 41 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 }; 42 static const u8 MAX6697_REG_CRIT[] = { 43 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 }; 44 45 /* 46 * Map device tree / platform data register bit map to chip bit map. 47 * Applies to alert register and over-temperature register. 48 */ 49 #define MAX6697_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \ 50 (((reg) & 0x01) << 6) | ((reg) & 0x80)) 51 52 #define MAX6697_REG_STAT(n) (0x44 + (n)) 53 54 #define MAX6697_REG_CONFIG 0x41 55 #define MAX6581_CONF_EXTENDED (1 << 1) 56 #define MAX6693_CONF_BETA (1 << 2) 57 #define MAX6697_CONF_RESISTANCE (1 << 3) 58 #define MAX6697_CONF_TIMEOUT (1 << 5) 59 #define MAX6697_REG_ALERT_MASK 0x42 60 #define MAX6697_REG_OVERT_MASK 0x43 61 62 #define MAX6581_REG_RESISTANCE 0x4a 63 #define MAX6581_REG_IDEALITY 0x4b 64 #define MAX6581_REG_IDEALITY_SELECT 0x4c 65 #define MAX6581_REG_OFFSET 0x4d 66 #define MAX6581_REG_OFFSET_SELECT 0x4e 67 68 #define MAX6697_CONV_TIME 156 /* ms per channel, worst case */ 69 70 struct max6697_chip_data { 71 int channels; 72 u32 have_ext; 73 u32 have_crit; 74 u32 have_fault; 75 u8 valid_conf; 76 const u8 *alarm_map; 77 }; 78 79 struct max6697_data { 80 struct device *hwmon_dev; 81 82 enum chips type; 83 const struct max6697_chip_data *chip; 84 85 int update_interval; /* in milli-seconds */ 86 int temp_offset; /* in degrees C */ 87 88 struct mutex update_lock; 89 unsigned long last_updated; /* In jiffies */ 90 bool valid; /* true if following fields are valid */ 91 92 /* 1x local and up to 7x remote */ 93 u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */ 94 #define MAX6697_TEMP_INPUT 0 95 #define MAX6697_TEMP_EXT 1 96 #define MAX6697_TEMP_MAX 2 97 #define MAX6697_TEMP_CRIT 3 98 u32 alarms; 99 }; 100 101 /* Diode fault status bits on MAX6581 are right shifted by one bit */ 102 static const u8 max6581_alarm_map[] = { 103 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 104 16, 17, 18, 19, 20, 21, 22, 23 }; 105 106 static const struct max6697_chip_data max6697_chip_data[] = { 107 [max6581] = { 108 .channels = 8, 109 .have_crit = 0xff, 110 .have_ext = 0x7f, 111 .have_fault = 0xfe, 112 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT, 113 .alarm_map = max6581_alarm_map, 114 }, 115 [max6602] = { 116 .channels = 5, 117 .have_crit = 0x12, 118 .have_ext = 0x02, 119 .have_fault = 0x1e, 120 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 121 }, 122 [max6622] = { 123 .channels = 5, 124 .have_crit = 0x12, 125 .have_ext = 0x02, 126 .have_fault = 0x1e, 127 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 128 }, 129 [max6636] = { 130 .channels = 7, 131 .have_crit = 0x72, 132 .have_ext = 0x02, 133 .have_fault = 0x7e, 134 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 135 }, 136 [max6689] = { 137 .channels = 7, 138 .have_crit = 0x72, 139 .have_ext = 0x02, 140 .have_fault = 0x7e, 141 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 142 }, 143 [max6693] = { 144 .channels = 7, 145 .have_crit = 0x72, 146 .have_ext = 0x02, 147 .have_fault = 0x7e, 148 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA | 149 MAX6697_CONF_TIMEOUT, 150 }, 151 [max6694] = { 152 .channels = 5, 153 .have_crit = 0x12, 154 .have_ext = 0x02, 155 .have_fault = 0x1e, 156 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA | 157 MAX6697_CONF_TIMEOUT, 158 }, 159 [max6697] = { 160 .channels = 7, 161 .have_crit = 0x72, 162 .have_ext = 0x02, 163 .have_fault = 0x7e, 164 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 165 }, 166 [max6698] = { 167 .channels = 7, 168 .have_crit = 0x72, 169 .have_ext = 0x02, 170 .have_fault = 0x0e, 171 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 172 }, 173 [max6699] = { 174 .channels = 5, 175 .have_crit = 0x12, 176 .have_ext = 0x02, 177 .have_fault = 0x1e, 178 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 179 }, 180 }; 181 182 static struct max6697_data *max6697_update_device(struct device *dev) 183 { 184 struct i2c_client *client = to_i2c_client(dev); 185 struct max6697_data *data = i2c_get_clientdata(client); 186 struct max6697_data *ret = data; 187 int val; 188 int i; 189 u32 alarms; 190 191 mutex_lock(&data->update_lock); 192 193 if (data->valid && 194 !time_after(jiffies, data->last_updated 195 + msecs_to_jiffies(data->update_interval))) 196 goto abort; 197 198 for (i = 0; i < data->chip->channels; i++) { 199 if (data->chip->have_ext & (1 << i)) { 200 val = i2c_smbus_read_byte_data(client, 201 MAX6697_REG_TEMP_EXT[i]); 202 if (unlikely(val < 0)) { 203 ret = ERR_PTR(val); 204 goto abort; 205 } 206 data->temp[i][MAX6697_TEMP_EXT] = val; 207 } 208 209 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]); 210 if (unlikely(val < 0)) { 211 ret = ERR_PTR(val); 212 goto abort; 213 } 214 data->temp[i][MAX6697_TEMP_INPUT] = val; 215 216 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]); 217 if (unlikely(val < 0)) { 218 ret = ERR_PTR(val); 219 goto abort; 220 } 221 data->temp[i][MAX6697_TEMP_MAX] = val; 222 223 if (data->chip->have_crit & (1 << i)) { 224 val = i2c_smbus_read_byte_data(client, 225 MAX6697_REG_CRIT[i]); 226 if (unlikely(val < 0)) { 227 ret = ERR_PTR(val); 228 goto abort; 229 } 230 data->temp[i][MAX6697_TEMP_CRIT] = val; 231 } 232 } 233 234 alarms = 0; 235 for (i = 0; i < 3; i++) { 236 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i)); 237 if (unlikely(val < 0)) { 238 ret = ERR_PTR(val); 239 goto abort; 240 } 241 alarms = (alarms << 8) | val; 242 } 243 data->alarms = alarms; 244 data->last_updated = jiffies; 245 data->valid = true; 246 abort: 247 mutex_unlock(&data->update_lock); 248 249 return ret; 250 } 251 252 static ssize_t show_temp_input(struct device *dev, 253 struct device_attribute *devattr, char *buf) 254 { 255 int index = to_sensor_dev_attr(devattr)->index; 256 struct max6697_data *data = max6697_update_device(dev); 257 int temp; 258 259 if (IS_ERR(data)) 260 return PTR_ERR(data); 261 262 temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3; 263 temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5; 264 265 return sprintf(buf, "%d\n", temp * 125); 266 } 267 268 static ssize_t show_temp(struct device *dev, 269 struct device_attribute *devattr, char *buf) 270 { 271 int nr = to_sensor_dev_attr_2(devattr)->nr; 272 int index = to_sensor_dev_attr_2(devattr)->index; 273 struct max6697_data *data = max6697_update_device(dev); 274 int temp; 275 276 if (IS_ERR(data)) 277 return PTR_ERR(data); 278 279 temp = data->temp[nr][index]; 280 temp -= data->temp_offset; 281 282 return sprintf(buf, "%d\n", temp * 1000); 283 } 284 285 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 286 char *buf) 287 { 288 int index = to_sensor_dev_attr(attr)->index; 289 struct max6697_data *data = max6697_update_device(dev); 290 291 if (IS_ERR(data)) 292 return PTR_ERR(data); 293 294 if (data->chip->alarm_map) 295 index = data->chip->alarm_map[index]; 296 297 return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1); 298 } 299 300 static ssize_t set_temp(struct device *dev, 301 struct device_attribute *devattr, 302 const char *buf, size_t count) 303 { 304 int nr = to_sensor_dev_attr_2(devattr)->nr; 305 int index = to_sensor_dev_attr_2(devattr)->index; 306 struct i2c_client *client = to_i2c_client(dev); 307 struct max6697_data *data = i2c_get_clientdata(client); 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(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 struct attribute *max6697_attributes[8][7] = { 403 { 404 &sensor_dev_attr_temp1_input.dev_attr.attr, 405 &sensor_dev_attr_temp1_max.dev_attr.attr, 406 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 407 &sensor_dev_attr_temp1_crit.dev_attr.attr, 408 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 409 NULL 410 }, { 411 &sensor_dev_attr_temp2_input.dev_attr.attr, 412 &sensor_dev_attr_temp2_max.dev_attr.attr, 413 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 414 &sensor_dev_attr_temp2_crit.dev_attr.attr, 415 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 416 &sensor_dev_attr_temp2_fault.dev_attr.attr, 417 NULL 418 }, { 419 &sensor_dev_attr_temp3_input.dev_attr.attr, 420 &sensor_dev_attr_temp3_max.dev_attr.attr, 421 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, 422 &sensor_dev_attr_temp3_crit.dev_attr.attr, 423 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, 424 &sensor_dev_attr_temp3_fault.dev_attr.attr, 425 NULL 426 }, { 427 &sensor_dev_attr_temp4_input.dev_attr.attr, 428 &sensor_dev_attr_temp4_max.dev_attr.attr, 429 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, 430 &sensor_dev_attr_temp4_crit.dev_attr.attr, 431 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr, 432 &sensor_dev_attr_temp4_fault.dev_attr.attr, 433 NULL 434 }, { 435 &sensor_dev_attr_temp5_input.dev_attr.attr, 436 &sensor_dev_attr_temp5_max.dev_attr.attr, 437 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, 438 &sensor_dev_attr_temp5_crit.dev_attr.attr, 439 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr, 440 &sensor_dev_attr_temp5_fault.dev_attr.attr, 441 NULL 442 }, { 443 &sensor_dev_attr_temp6_input.dev_attr.attr, 444 &sensor_dev_attr_temp6_max.dev_attr.attr, 445 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr, 446 &sensor_dev_attr_temp6_crit.dev_attr.attr, 447 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr, 448 &sensor_dev_attr_temp6_fault.dev_attr.attr, 449 NULL 450 }, { 451 &sensor_dev_attr_temp7_input.dev_attr.attr, 452 &sensor_dev_attr_temp7_max.dev_attr.attr, 453 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr, 454 &sensor_dev_attr_temp7_crit.dev_attr.attr, 455 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr, 456 &sensor_dev_attr_temp7_fault.dev_attr.attr, 457 NULL 458 }, { 459 &sensor_dev_attr_temp8_input.dev_attr.attr, 460 &sensor_dev_attr_temp8_max.dev_attr.attr, 461 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr, 462 &sensor_dev_attr_temp8_crit.dev_attr.attr, 463 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr, 464 &sensor_dev_attr_temp8_fault.dev_attr.attr, 465 NULL 466 } 467 }; 468 469 static const struct attribute_group max6697_group[8] = { 470 { .attrs = max6697_attributes[0] }, 471 { .attrs = max6697_attributes[1] }, 472 { .attrs = max6697_attributes[2] }, 473 { .attrs = max6697_attributes[3] }, 474 { .attrs = max6697_attributes[4] }, 475 { .attrs = max6697_attributes[5] }, 476 { .attrs = max6697_attributes[6] }, 477 { .attrs = max6697_attributes[7] }, 478 }; 479 480 static void max6697_get_config_of(struct device_node *node, 481 struct max6697_platform_data *pdata) 482 { 483 int len; 484 const __be32 *prop; 485 486 prop = of_get_property(node, "smbus-timeout-disable", &len); 487 if (prop) 488 pdata->smbus_timeout_disable = true; 489 prop = of_get_property(node, "extended-range-enable", &len); 490 if (prop) 491 pdata->extended_range_enable = true; 492 prop = of_get_property(node, "beta-compensation-enable", &len); 493 if (prop) 494 pdata->beta_compensation = true; 495 prop = of_get_property(node, "alert-mask", &len); 496 if (prop && len == sizeof(u32)) 497 pdata->alert_mask = be32_to_cpu(prop[0]); 498 prop = of_get_property(node, "over-temperature-mask", &len); 499 if (prop && len == sizeof(u32)) 500 pdata->over_temperature_mask = be32_to_cpu(prop[0]); 501 prop = of_get_property(node, "resistance-cancellation", &len); 502 if (prop) { 503 if (len == sizeof(u32)) 504 pdata->resistance_cancellation = be32_to_cpu(prop[0]); 505 else 506 pdata->resistance_cancellation = 0xfe; 507 } 508 prop = of_get_property(node, "transistor-ideality", &len); 509 if (prop && len == 2 * sizeof(u32)) { 510 pdata->ideality_mask = be32_to_cpu(prop[0]); 511 pdata->ideality_value = be32_to_cpu(prop[1]); 512 } 513 } 514 515 static int max6697_init_chip(struct i2c_client *client) 516 { 517 struct max6697_data *data = i2c_get_clientdata(client); 518 struct max6697_platform_data *pdata = dev_get_platdata(&client->dev); 519 struct max6697_platform_data p; 520 const struct max6697_chip_data *chip = data->chip; 521 int factor = chip->channels; 522 int ret, reg; 523 524 /* 525 * Don't touch configuration if neither platform data nor OF 526 * configuration was specified. If that is the case, use the 527 * current chip configuration. 528 */ 529 if (!pdata && !client->dev.of_node) { 530 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG); 531 if (reg < 0) 532 return reg; 533 if (data->type == max6581) { 534 if (reg & MAX6581_CONF_EXTENDED) 535 data->temp_offset = 64; 536 reg = i2c_smbus_read_byte_data(client, 537 MAX6581_REG_RESISTANCE); 538 if (reg < 0) 539 return reg; 540 factor += hweight8(reg); 541 } else { 542 if (reg & MAX6697_CONF_RESISTANCE) 543 factor++; 544 } 545 goto done; 546 } 547 548 if (client->dev.of_node) { 549 memset(&p, 0, sizeof(p)); 550 max6697_get_config_of(client->dev.of_node, &p); 551 pdata = &p; 552 } 553 554 reg = 0; 555 if (pdata->smbus_timeout_disable && 556 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) { 557 reg |= MAX6697_CONF_TIMEOUT; 558 } 559 if (pdata->extended_range_enable && 560 (chip->valid_conf & MAX6581_CONF_EXTENDED)) { 561 reg |= MAX6581_CONF_EXTENDED; 562 data->temp_offset = 64; 563 } 564 if (pdata->resistance_cancellation && 565 (chip->valid_conf & MAX6697_CONF_RESISTANCE)) { 566 reg |= MAX6697_CONF_RESISTANCE; 567 factor++; 568 } 569 if (pdata->beta_compensation && 570 (chip->valid_conf & MAX6693_CONF_BETA)) { 571 reg |= MAX6693_CONF_BETA; 572 } 573 574 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg); 575 if (ret < 0) 576 return ret; 577 578 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK, 579 MAX6697_MAP_BITS(pdata->alert_mask)); 580 if (ret < 0) 581 return ret; 582 583 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK, 584 MAX6697_MAP_BITS(pdata->over_temperature_mask)); 585 if (ret < 0) 586 return ret; 587 588 if (data->type == max6581) { 589 factor += hweight8(pdata->resistance_cancellation >> 1); 590 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE, 591 pdata->resistance_cancellation >> 1); 592 if (ret < 0) 593 return ret; 594 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY, 595 pdata->ideality_mask >> 1); 596 if (ret < 0) 597 return ret; 598 ret = i2c_smbus_write_byte_data(client, 599 MAX6581_REG_IDEALITY_SELECT, 600 pdata->ideality_value); 601 if (ret < 0) 602 return ret; 603 } 604 done: 605 data->update_interval = factor * MAX6697_CONV_TIME; 606 return 0; 607 } 608 609 static void max6697_remove_files(struct i2c_client *client) 610 { 611 int i; 612 613 for (i = 0; i < ARRAY_SIZE(max6697_group); i++) 614 sysfs_remove_group(&client->dev.kobj, &max6697_group[i]); 615 } 616 617 static int max6697_probe(struct i2c_client *client, 618 const struct i2c_device_id *id) 619 { 620 struct i2c_adapter *adapter = client->adapter; 621 struct device *dev = &client->dev; 622 struct max6697_data *data; 623 int i, err; 624 625 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 626 return -ENODEV; 627 628 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL); 629 if (!data) 630 return -ENOMEM; 631 632 data->type = id->driver_data; 633 data->chip = &max6697_chip_data[data->type]; 634 635 i2c_set_clientdata(client, data); 636 mutex_init(&data->update_lock); 637 638 err = max6697_init_chip(client); 639 if (err) 640 return err; 641 642 for (i = 0; i < data->chip->channels; i++) { 643 err = sysfs_create_file(&dev->kobj, 644 max6697_attributes[i][0]); 645 if (err) 646 goto error; 647 err = sysfs_create_file(&dev->kobj, 648 max6697_attributes[i][1]); 649 if (err) 650 goto error; 651 err = sysfs_create_file(&dev->kobj, 652 max6697_attributes[i][2]); 653 if (err) 654 goto error; 655 656 if (data->chip->have_crit & (1 << i)) { 657 err = sysfs_create_file(&dev->kobj, 658 max6697_attributes[i][3]); 659 if (err) 660 goto error; 661 err = sysfs_create_file(&dev->kobj, 662 max6697_attributes[i][4]); 663 if (err) 664 goto error; 665 } 666 if (data->chip->have_fault & (1 << i)) { 667 err = sysfs_create_file(&dev->kobj, 668 max6697_attributes[i][5]); 669 if (err) 670 goto error; 671 } 672 } 673 674 data->hwmon_dev = hwmon_device_register(dev); 675 if (IS_ERR(data->hwmon_dev)) { 676 err = PTR_ERR(data->hwmon_dev); 677 goto error; 678 } 679 680 return 0; 681 682 error: 683 max6697_remove_files(client); 684 return err; 685 } 686 687 static int max6697_remove(struct i2c_client *client) 688 { 689 struct max6697_data *data = i2c_get_clientdata(client); 690 691 hwmon_device_unregister(data->hwmon_dev); 692 max6697_remove_files(client); 693 694 return 0; 695 } 696 697 static const struct i2c_device_id max6697_id[] = { 698 { "max6581", max6581 }, 699 { "max6602", max6602 }, 700 { "max6622", max6622 }, 701 { "max6636", max6636 }, 702 { "max6689", max6689 }, 703 { "max6693", max6693 }, 704 { "max6694", max6694 }, 705 { "max6697", max6697 }, 706 { "max6698", max6698 }, 707 { "max6699", max6699 }, 708 { } 709 }; 710 MODULE_DEVICE_TABLE(i2c, max6697_id); 711 712 static struct i2c_driver max6697_driver = { 713 .class = I2C_CLASS_HWMON, 714 .driver = { 715 .name = "max6697", 716 }, 717 .probe = max6697_probe, 718 .remove = max6697_remove, 719 .id_table = max6697_id, 720 }; 721 722 module_i2c_driver(max6697_driver); 723 724 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 725 MODULE_DESCRIPTION("MAX6697 temperature sensor driver"); 726 MODULE_LICENSE("GPL"); 727