1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /*************************************************************************** 3 * Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> * 4 * * 5 ***************************************************************************/ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/module.h> 10 #include <linux/mod_devicetable.h> 11 #include <linux/init.h> 12 #include <linux/slab.h> 13 #include <linux/jiffies.h> 14 #include <linux/platform_device.h> 15 #include <linux/hwmon.h> 16 #include <linux/err.h> 17 #include <linux/mutex.h> 18 #include "sch56xx-common.h" 19 20 #define DRVNAME "sch5627" 21 #define DEVNAME DRVNAME /* We only support one model */ 22 23 #define SCH5627_HWMON_ID 0xa5 24 #define SCH5627_COMPANY_ID 0x5c 25 #define SCH5627_PRIMARY_ID 0xa0 26 27 #define SCH5627_REG_BUILD_CODE 0x39 28 #define SCH5627_REG_BUILD_ID 0x3a 29 #define SCH5627_REG_HWMON_ID 0x3c 30 #define SCH5627_REG_HWMON_REV 0x3d 31 #define SCH5627_REG_COMPANY_ID 0x3e 32 #define SCH5627_REG_PRIMARY_ID 0x3f 33 #define SCH5627_REG_CTRL 0x40 34 35 #define SCH5627_NO_TEMPS 8 36 #define SCH5627_NO_FANS 4 37 #define SCH5627_NO_IN 5 38 39 static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = { 40 0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 }; 41 static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = { 42 0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 }; 43 static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = { 44 0, 0, 1, 1, 0, 0, 0, 1 }; 45 static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = { 46 0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 }; 47 static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = { 48 0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 }; 49 50 static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = { 51 0x2C, 0x2E, 0x30, 0x32 }; 52 static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = { 53 0x62, 0x64, 0x66, 0x68 }; 54 55 static const u16 SCH5627_REG_PWM_MAP[SCH5627_NO_FANS] = { 56 0xA0, 0xA1, 0xA2, 0xA3 }; 57 58 static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = { 59 0x22, 0x23, 0x24, 0x25, 0x189 }; 60 static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = { 61 0xE4, 0xE4, 0xE3, 0xE3, 0x18A }; 62 static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = { 63 1, 0, 1, 0, 1 }; 64 static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = { 65 10745, 3660, 9765, 10745, 3660 }; 66 static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = { 67 "VCC", "VTT", "VBAT", "VTR", "V_IN" }; 68 69 struct sch5627_data { 70 unsigned short addr; 71 u8 control; 72 u8 temp_max[SCH5627_NO_TEMPS]; 73 u8 temp_crit[SCH5627_NO_TEMPS]; 74 u16 fan_min[SCH5627_NO_FANS]; 75 76 struct mutex update_lock; 77 unsigned long last_battery; /* In jiffies */ 78 char temp_valid; /* !=0 if following fields are valid */ 79 char fan_valid; 80 char in_valid; 81 unsigned long temp_last_updated; /* In jiffies */ 82 unsigned long fan_last_updated; 83 unsigned long in_last_updated; 84 u16 temp[SCH5627_NO_TEMPS]; 85 u16 fan[SCH5627_NO_FANS]; 86 u16 in[SCH5627_NO_IN]; 87 }; 88 89 static int sch5627_update_temp(struct sch5627_data *data) 90 { 91 int ret = 0; 92 int i, val; 93 94 mutex_lock(&data->update_lock); 95 96 /* Cache the values for 1 second */ 97 if (time_after(jiffies, data->temp_last_updated + HZ) || !data->temp_valid) { 98 for (i = 0; i < SCH5627_NO_TEMPS; i++) { 99 val = sch56xx_read_virtual_reg12(data->addr, SCH5627_REG_TEMP_MSB[i], 100 SCH5627_REG_TEMP_LSN[i], 101 SCH5627_REG_TEMP_HIGH_NIBBLE[i]); 102 if (unlikely(val < 0)) { 103 ret = val; 104 goto abort; 105 } 106 data->temp[i] = val; 107 } 108 data->temp_last_updated = jiffies; 109 data->temp_valid = 1; 110 } 111 abort: 112 mutex_unlock(&data->update_lock); 113 return ret; 114 } 115 116 static int sch5627_update_fan(struct sch5627_data *data) 117 { 118 int ret = 0; 119 int i, val; 120 121 mutex_lock(&data->update_lock); 122 123 /* Cache the values for 1 second */ 124 if (time_after(jiffies, data->fan_last_updated + HZ) || !data->fan_valid) { 125 for (i = 0; i < SCH5627_NO_FANS; i++) { 126 val = sch56xx_read_virtual_reg16(data->addr, SCH5627_REG_FAN[i]); 127 if (unlikely(val < 0)) { 128 ret = val; 129 goto abort; 130 } 131 data->fan[i] = val; 132 } 133 data->fan_last_updated = jiffies; 134 data->fan_valid = 1; 135 } 136 abort: 137 mutex_unlock(&data->update_lock); 138 return ret; 139 } 140 141 static int sch5627_update_in(struct sch5627_data *data) 142 { 143 int ret = 0; 144 int i, val; 145 146 mutex_lock(&data->update_lock); 147 148 /* Trigger a Vbat voltage measurement every 5 minutes */ 149 if (time_after(jiffies, data->last_battery + 300 * HZ)) { 150 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL, data->control | 0x10); 151 data->last_battery = jiffies; 152 } 153 154 /* Cache the values for 1 second */ 155 if (time_after(jiffies, data->in_last_updated + HZ) || !data->in_valid) { 156 for (i = 0; i < SCH5627_NO_IN; i++) { 157 val = sch56xx_read_virtual_reg12(data->addr, SCH5627_REG_IN_MSB[i], 158 SCH5627_REG_IN_LSN[i], 159 SCH5627_REG_IN_HIGH_NIBBLE[i]); 160 if (unlikely(val < 0)) { 161 ret = val; 162 goto abort; 163 } 164 data->in[i] = val; 165 } 166 data->in_last_updated = jiffies; 167 data->in_valid = 1; 168 } 169 abort: 170 mutex_unlock(&data->update_lock); 171 return ret; 172 } 173 174 static int sch5627_read_limits(struct sch5627_data *data) 175 { 176 int i, val; 177 178 for (i = 0; i < SCH5627_NO_TEMPS; i++) { 179 /* 180 * Note what SMSC calls ABS, is what lm_sensors calls max 181 * (aka high), and HIGH is what lm_sensors calls crit. 182 */ 183 val = sch56xx_read_virtual_reg(data->addr, 184 SCH5627_REG_TEMP_ABS[i]); 185 if (val < 0) 186 return val; 187 data->temp_max[i] = val; 188 189 val = sch56xx_read_virtual_reg(data->addr, 190 SCH5627_REG_TEMP_HIGH[i]); 191 if (val < 0) 192 return val; 193 data->temp_crit[i] = val; 194 } 195 for (i = 0; i < SCH5627_NO_FANS; i++) { 196 val = sch56xx_read_virtual_reg16(data->addr, 197 SCH5627_REG_FAN_MIN[i]); 198 if (val < 0) 199 return val; 200 data->fan_min[i] = val; 201 } 202 203 return 0; 204 } 205 206 static int reg_to_temp(u16 reg) 207 { 208 return (reg * 625) / 10 - 64000; 209 } 210 211 static int reg_to_temp_limit(u8 reg) 212 { 213 return (reg - 64) * 1000; 214 } 215 216 static int reg_to_rpm(u16 reg) 217 { 218 if (reg == 0) 219 return -EIO; 220 if (reg == 0xffff) 221 return 0; 222 223 return 5400540 / reg; 224 } 225 226 static umode_t sch5627_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, 227 int channel) 228 { 229 if (type == hwmon_pwm && attr == hwmon_pwm_auto_channels_temp) 230 return 0644; 231 232 return 0444; 233 } 234 235 static int sch5627_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 236 long *val) 237 { 238 struct sch5627_data *data = dev_get_drvdata(dev); 239 int ret; 240 241 switch (type) { 242 case hwmon_temp: 243 ret = sch5627_update_temp(data); 244 if (ret < 0) 245 return ret; 246 switch (attr) { 247 case hwmon_temp_input: 248 *val = reg_to_temp(data->temp[channel]); 249 return 0; 250 case hwmon_temp_max: 251 *val = reg_to_temp_limit(data->temp_max[channel]); 252 return 0; 253 case hwmon_temp_crit: 254 *val = reg_to_temp_limit(data->temp_crit[channel]); 255 return 0; 256 case hwmon_temp_fault: 257 *val = (data->temp[channel] == 0); 258 return 0; 259 default: 260 break; 261 } 262 break; 263 case hwmon_fan: 264 ret = sch5627_update_fan(data); 265 if (ret < 0) 266 return ret; 267 switch (attr) { 268 case hwmon_fan_input: 269 ret = reg_to_rpm(data->fan[channel]); 270 if (ret < 0) 271 return ret; 272 *val = ret; 273 return 0; 274 case hwmon_fan_min: 275 ret = reg_to_rpm(data->fan_min[channel]); 276 if (ret < 0) 277 return ret; 278 *val = ret; 279 return 0; 280 case hwmon_fan_fault: 281 *val = (data->fan[channel] == 0xffff); 282 return 0; 283 default: 284 break; 285 } 286 break; 287 case hwmon_pwm: 288 switch (attr) { 289 case hwmon_pwm_auto_channels_temp: 290 mutex_lock(&data->update_lock); 291 ret = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PWM_MAP[channel]); 292 mutex_unlock(&data->update_lock); 293 294 if (ret < 0) 295 return ret; 296 297 *val = ret; 298 299 return 0; 300 default: 301 break; 302 } 303 break; 304 case hwmon_in: 305 ret = sch5627_update_in(data); 306 if (ret < 0) 307 return ret; 308 switch (attr) { 309 case hwmon_in_input: 310 *val = DIV_ROUND_CLOSEST(data->in[channel] * SCH5627_REG_IN_FACTOR[channel], 311 10000); 312 return 0; 313 default: 314 break; 315 } 316 break; 317 default: 318 break; 319 } 320 321 return -EOPNOTSUPP; 322 } 323 324 static int sch5627_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, 325 int channel, const char **str) 326 { 327 switch (type) { 328 case hwmon_in: 329 switch (attr) { 330 case hwmon_in_label: 331 *str = SCH5627_IN_LABELS[channel]; 332 return 0; 333 default: 334 break; 335 } 336 break; 337 default: 338 break; 339 } 340 341 return -EOPNOTSUPP; 342 } 343 344 static int sch5627_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 345 long val) 346 { 347 struct sch5627_data *data = dev_get_drvdata(dev); 348 int ret; 349 350 switch (type) { 351 case hwmon_pwm: 352 switch (attr) { 353 case hwmon_pwm_auto_channels_temp: 354 /* registers are 8 bit wide */ 355 if (val > U8_MAX || val < 0) 356 return -EINVAL; 357 358 mutex_lock(&data->update_lock); 359 ret = sch56xx_write_virtual_reg(data->addr, SCH5627_REG_PWM_MAP[channel], 360 val); 361 mutex_unlock(&data->update_lock); 362 363 return ret; 364 default: 365 break; 366 } 367 break; 368 default: 369 break; 370 } 371 372 return -EOPNOTSUPP; 373 } 374 375 static const struct hwmon_ops sch5627_ops = { 376 .is_visible = sch5627_is_visible, 377 .read = sch5627_read, 378 .read_string = sch5627_read_string, 379 .write = sch5627_write, 380 }; 381 382 static const struct hwmon_channel_info * const sch5627_info[] = { 383 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), 384 HWMON_CHANNEL_INFO(temp, 385 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT, 386 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT, 387 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT, 388 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT, 389 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT, 390 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT, 391 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT, 392 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT 393 ), 394 HWMON_CHANNEL_INFO(fan, 395 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT, 396 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT, 397 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT, 398 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT 399 ), 400 HWMON_CHANNEL_INFO(pwm, 401 HWMON_PWM_AUTO_CHANNELS_TEMP, 402 HWMON_PWM_AUTO_CHANNELS_TEMP, 403 HWMON_PWM_AUTO_CHANNELS_TEMP, 404 HWMON_PWM_AUTO_CHANNELS_TEMP 405 ), 406 HWMON_CHANNEL_INFO(in, 407 HWMON_I_INPUT | HWMON_I_LABEL, 408 HWMON_I_INPUT | HWMON_I_LABEL, 409 HWMON_I_INPUT | HWMON_I_LABEL, 410 HWMON_I_INPUT | HWMON_I_LABEL, 411 HWMON_I_INPUT 412 ), 413 NULL 414 }; 415 416 static const struct hwmon_chip_info sch5627_chip_info = { 417 .ops = &sch5627_ops, 418 .info = sch5627_info, 419 }; 420 421 static int sch5627_probe(struct platform_device *pdev) 422 { 423 struct sch5627_data *data; 424 struct device *hwmon_dev; 425 int err, build_code, build_id, hwmon_rev, val; 426 427 data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data), 428 GFP_KERNEL); 429 if (!data) 430 return -ENOMEM; 431 432 data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start; 433 mutex_init(&data->update_lock); 434 platform_set_drvdata(pdev, data); 435 436 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID); 437 if (val < 0) 438 return val; 439 440 if (val != SCH5627_HWMON_ID) { 441 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon", 442 val, SCH5627_HWMON_ID); 443 return -ENODEV; 444 } 445 446 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID); 447 if (val < 0) 448 return val; 449 450 if (val != SCH5627_COMPANY_ID) { 451 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company", 452 val, SCH5627_COMPANY_ID); 453 return -ENODEV; 454 } 455 456 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID); 457 if (val < 0) 458 return val; 459 460 if (val != SCH5627_PRIMARY_ID) { 461 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary", 462 val, SCH5627_PRIMARY_ID); 463 return -ENODEV; 464 } 465 466 build_code = sch56xx_read_virtual_reg(data->addr, 467 SCH5627_REG_BUILD_CODE); 468 if (build_code < 0) 469 return build_code; 470 471 build_id = sch56xx_read_virtual_reg16(data->addr, 472 SCH5627_REG_BUILD_ID); 473 if (build_id < 0) 474 return build_id; 475 476 hwmon_rev = sch56xx_read_virtual_reg(data->addr, 477 SCH5627_REG_HWMON_REV); 478 if (hwmon_rev < 0) 479 return hwmon_rev; 480 481 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL); 482 if (val < 0) 483 return val; 484 485 data->control = val; 486 if (!(data->control & 0x01)) { 487 pr_err("hardware monitoring not enabled\n"); 488 return -ENODEV; 489 } 490 /* Trigger a Vbat voltage measurement, so that we get a valid reading 491 the first time we read Vbat */ 492 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL, 493 data->control | 0x10); 494 data->last_battery = jiffies; 495 496 /* 497 * Read limits, we do this only once as reading a register on 498 * the sch5627 is quite expensive (and they don't change). 499 */ 500 err = sch5627_read_limits(data); 501 if (err) 502 return err; 503 504 pr_info("found %s chip at %#hx\n", DEVNAME, data->addr); 505 pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n", 506 build_code, build_id, hwmon_rev); 507 508 hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, DEVNAME, data, 509 &sch5627_chip_info, NULL); 510 if (IS_ERR(hwmon_dev)) 511 return PTR_ERR(hwmon_dev); 512 513 /* Note failing to register the watchdog is not a fatal error */ 514 sch56xx_watchdog_register(&pdev->dev, data->addr, 515 (build_code << 24) | (build_id << 8) | hwmon_rev, 516 &data->update_lock, 1); 517 518 return 0; 519 } 520 521 static const struct platform_device_id sch5627_device_id[] = { 522 { 523 .name = "sch5627", 524 }, 525 { } 526 }; 527 MODULE_DEVICE_TABLE(platform, sch5627_device_id); 528 529 static struct platform_driver sch5627_driver = { 530 .driver = { 531 .name = DRVNAME, 532 }, 533 .probe = sch5627_probe, 534 .id_table = sch5627_device_id, 535 }; 536 537 module_platform_driver(sch5627_driver); 538 539 MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver"); 540 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 541 MODULE_LICENSE("GPL"); 542