1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * fschmd.c 4 * 5 * Copyright (C) 2007 - 2009 Hans de Goede <hdegoede@redhat.com> 6 */ 7 8 /* 9 * Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes, 10 * Scylla, Heracles, Heimdall, Hades and Syleus chips 11 * 12 * Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6 13 * (candidate) fschmd drivers: 14 * Copyright (C) 2006 Thilo Cestonaro 15 * <thilo.cestonaro.external@fujitsu-siemens.com> 16 * Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch> 17 * Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de> 18 * Copyright (c) 2001 Martin Knoblauch <mkn@teraport.de, knobi@knobisoft.de> 19 * Copyright (C) 2000 Hermann Jung <hej@odn.de> 20 */ 21 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/jiffies.h> 26 #include <linux/i2c.h> 27 #include <linux/hwmon.h> 28 #include <linux/hwmon-sysfs.h> 29 #include <linux/err.h> 30 #include <linux/mutex.h> 31 #include <linux/sysfs.h> 32 #include <linux/dmi.h> 33 #include <linux/fs.h> 34 #include <linux/watchdog.h> 35 #include <linux/miscdevice.h> 36 #include <linux/uaccess.h> 37 #include <linux/kref.h> 38 39 /* Addresses to scan */ 40 static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END }; 41 42 /* Insmod parameters */ 43 static bool nowayout = WATCHDOG_NOWAYOUT; 44 module_param(nowayout, bool, 0); 45 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" 46 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 47 48 enum chips { fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl }; 49 50 /* 51 * The FSCHMD registers and other defines 52 */ 53 54 /* chip identification */ 55 #define FSCHMD_REG_IDENT_0 0x00 56 #define FSCHMD_REG_IDENT_1 0x01 57 #define FSCHMD_REG_IDENT_2 0x02 58 #define FSCHMD_REG_REVISION 0x03 59 60 /* global control and status */ 61 #define FSCHMD_REG_EVENT_STATE 0x04 62 #define FSCHMD_REG_CONTROL 0x05 63 64 #define FSCHMD_CONTROL_ALERT_LED 0x01 65 66 /* watchdog */ 67 static const u8 FSCHMD_REG_WDOG_CONTROL[7] = { 68 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 }; 69 static const u8 FSCHMD_REG_WDOG_STATE[7] = { 70 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 }; 71 static const u8 FSCHMD_REG_WDOG_PRESET[7] = { 72 0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a }; 73 74 #define FSCHMD_WDOG_CONTROL_TRIGGER 0x10 75 #define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */ 76 #define FSCHMD_WDOG_CONTROL_STOP 0x20 77 #define FSCHMD_WDOG_CONTROL_RESOLUTION 0x40 78 79 #define FSCHMD_WDOG_STATE_CARDRESET 0x02 80 81 /* voltages, weird order is to keep the same order as the old drivers */ 82 static const u8 FSCHMD_REG_VOLT[7][6] = { 83 { 0x45, 0x42, 0x48 }, /* pos */ 84 { 0x45, 0x42, 0x48 }, /* her */ 85 { 0x45, 0x42, 0x48 }, /* scy */ 86 { 0x45, 0x42, 0x48 }, /* hrc */ 87 { 0x45, 0x42, 0x48 }, /* hmd */ 88 { 0x21, 0x20, 0x22 }, /* hds */ 89 { 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 }, /* syl */ 90 }; 91 92 static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 }; 93 94 /* 95 * minimum pwm at which the fan is driven (pwm can be increased depending on 96 * the temp. Notice that for the scy some fans share there minimum speed. 97 * Also notice that with the scy the sensor order is different than with the 98 * other chips, this order was in the 2.4 driver and kept for consistency. 99 */ 100 static const u8 FSCHMD_REG_FAN_MIN[7][7] = { 101 { 0x55, 0x65 }, /* pos */ 102 { 0x55, 0x65, 0xb5 }, /* her */ 103 { 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 }, /* scy */ 104 { 0x55, 0x65, 0xa5, 0xb5 }, /* hrc */ 105 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hmd */ 106 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hds */ 107 { 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 }, /* syl */ 108 }; 109 110 /* actual fan speed */ 111 static const u8 FSCHMD_REG_FAN_ACT[7][7] = { 112 { 0x0e, 0x6b, 0xab }, /* pos */ 113 { 0x0e, 0x6b, 0xbb }, /* her */ 114 { 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb }, /* scy */ 115 { 0x0e, 0x6b, 0xab, 0xbb }, /* hrc */ 116 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hmd */ 117 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hds */ 118 { 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 }, /* syl */ 119 }; 120 121 /* fan status registers */ 122 static const u8 FSCHMD_REG_FAN_STATE[7][7] = { 123 { 0x0d, 0x62, 0xa2 }, /* pos */ 124 { 0x0d, 0x62, 0xb2 }, /* her */ 125 { 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 }, /* scy */ 126 { 0x0d, 0x62, 0xa2, 0xb2 }, /* hrc */ 127 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hmd */ 128 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hds */ 129 { 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 }, /* syl */ 130 }; 131 132 /* fan ripple / divider registers */ 133 static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = { 134 { 0x0f, 0x6f, 0xaf }, /* pos */ 135 { 0x0f, 0x6f, 0xbf }, /* her */ 136 { 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf }, /* scy */ 137 { 0x0f, 0x6f, 0xaf, 0xbf }, /* hrc */ 138 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hmd */ 139 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hds */ 140 { 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 }, /* syl */ 141 }; 142 143 static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 }; 144 145 /* Fan status register bitmasks */ 146 #define FSCHMD_FAN_ALARM 0x04 /* called fault by FSC! */ 147 #define FSCHMD_FAN_NOT_PRESENT 0x08 148 #define FSCHMD_FAN_DISABLED 0x80 149 150 151 /* actual temperature registers */ 152 static const u8 FSCHMD_REG_TEMP_ACT[7][11] = { 153 { 0x64, 0x32, 0x35 }, /* pos */ 154 { 0x64, 0x32, 0x35 }, /* her */ 155 { 0x64, 0xD0, 0x32, 0x35 }, /* scy */ 156 { 0x64, 0x32, 0x35 }, /* hrc */ 157 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hmd */ 158 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hds */ 159 { 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8, /* syl */ 160 0xb8, 0xc8, 0xd8, 0xe8, 0xf8 }, 161 }; 162 163 /* temperature state registers */ 164 static const u8 FSCHMD_REG_TEMP_STATE[7][11] = { 165 { 0x71, 0x81, 0x91 }, /* pos */ 166 { 0x71, 0x81, 0x91 }, /* her */ 167 { 0x71, 0xd1, 0x81, 0x91 }, /* scy */ 168 { 0x71, 0x81, 0x91 }, /* hrc */ 169 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hmd */ 170 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hds */ 171 { 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9, /* syl */ 172 0xb9, 0xc9, 0xd9, 0xe9, 0xf9 }, 173 }; 174 175 /* 176 * temperature high limit registers, FSC does not document these. Proven to be 177 * there with field testing on the fscher and fschrc, already supported / used 178 * in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers 179 * at these addresses, but doesn't want to confirm they are the same as with 180 * the fscher?? 181 */ 182 static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = { 183 { 0, 0, 0 }, /* pos */ 184 { 0x76, 0x86, 0x96 }, /* her */ 185 { 0x76, 0xd6, 0x86, 0x96 }, /* scy */ 186 { 0x76, 0x86, 0x96 }, /* hrc */ 187 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hmd */ 188 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hds */ 189 { 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa, /* syl */ 190 0xba, 0xca, 0xda, 0xea, 0xfa }, 191 }; 192 193 /* 194 * These were found through experimenting with an fscher, currently they are 195 * not used, but we keep them around for future reference. 196 * On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc), 197 * AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence 198 * the fan speed. 199 * static const u8 FSCHER_REG_TEMP_AUTOP1[] = { 0x73, 0x83, 0x93 }; 200 * static const u8 FSCHER_REG_TEMP_AUTOP2[] = { 0x75, 0x85, 0x95 }; 201 */ 202 203 static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 }; 204 205 /* temp status register bitmasks */ 206 #define FSCHMD_TEMP_WORKING 0x01 207 #define FSCHMD_TEMP_ALERT 0x02 208 #define FSCHMD_TEMP_DISABLED 0x80 209 /* there only really is an alarm if the sensor is working and alert == 1 */ 210 #define FSCHMD_TEMP_ALARM_MASK \ 211 (FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT) 212 213 /* 214 * Functions declarations 215 */ 216 217 static int fschmd_probe(struct i2c_client *client); 218 static int fschmd_detect(struct i2c_client *client, 219 struct i2c_board_info *info); 220 static void fschmd_remove(struct i2c_client *client); 221 static struct fschmd_data *fschmd_update_device(struct device *dev); 222 223 /* 224 * Driver data (common to all clients) 225 */ 226 227 static const struct i2c_device_id fschmd_id[] = { 228 { "fscpos", fscpos }, 229 { "fscher", fscher }, 230 { "fscscy", fscscy }, 231 { "fschrc", fschrc }, 232 { "fschmd", fschmd }, 233 { "fschds", fschds }, 234 { "fscsyl", fscsyl }, 235 { } 236 }; 237 MODULE_DEVICE_TABLE(i2c, fschmd_id); 238 239 static struct i2c_driver fschmd_driver = { 240 .class = I2C_CLASS_HWMON, 241 .driver = { 242 .name = "fschmd", 243 }, 244 .probe = fschmd_probe, 245 .remove = fschmd_remove, 246 .id_table = fschmd_id, 247 .detect = fschmd_detect, 248 .address_list = normal_i2c, 249 }; 250 251 /* 252 * Client data (each client gets its own) 253 */ 254 255 struct fschmd_data { 256 struct i2c_client *client; 257 struct device *hwmon_dev; 258 struct mutex update_lock; 259 struct mutex watchdog_lock; 260 struct list_head list; /* member of the watchdog_data_list */ 261 struct kref kref; 262 struct miscdevice watchdog_miscdev; 263 enum chips kind; 264 unsigned long watchdog_is_open; 265 char watchdog_expect_close; 266 char watchdog_name[10]; /* must be unique to avoid sysfs conflict */ 267 bool valid; /* false until following fields are valid */ 268 unsigned long last_updated; /* in jiffies */ 269 270 /* register values */ 271 u8 revision; /* chip revision */ 272 u8 global_control; /* global control register */ 273 u8 watchdog_control; /* watchdog control register */ 274 u8 watchdog_state; /* watchdog status register */ 275 u8 watchdog_preset; /* watchdog counter preset on trigger val */ 276 u8 volt[6]; /* voltage */ 277 u8 temp_act[11]; /* temperature */ 278 u8 temp_status[11]; /* status of sensor */ 279 u8 temp_max[11]; /* high temp limit, notice: undocumented! */ 280 u8 fan_act[7]; /* fans revolutions per second */ 281 u8 fan_status[7]; /* fan status */ 282 u8 fan_min[7]; /* fan min value for rps */ 283 u8 fan_ripple[7]; /* divider for rps */ 284 }; 285 286 /* 287 * Global variables to hold information read from special DMI tables, which are 288 * available on FSC machines with an fscher or later chip. There is no need to 289 * protect these with a lock as they are only modified from our attach function 290 * which always gets called with the i2c-core lock held and never accessed 291 * before the attach function is done with them. 292 */ 293 static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 }; 294 static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 }; 295 static int dmi_vref = -1; 296 297 /* 298 * Somewhat ugly :( global data pointer list with all fschmd devices, so that 299 * we can find our device data as when using misc_register there is no other 300 * method to get to ones device data from the open fop. 301 */ 302 static LIST_HEAD(watchdog_data_list); 303 /* Note this lock not only protect list access, but also data.kref access */ 304 static DEFINE_MUTEX(watchdog_data_mutex); 305 306 /* 307 * Release our data struct when we're detached from the i2c client *and* all 308 * references to our watchdog device are released 309 */ 310 static void fschmd_release_resources(struct kref *ref) 311 { 312 struct fschmd_data *data = container_of(ref, struct fschmd_data, kref); 313 kfree(data); 314 } 315 316 /* 317 * Sysfs attr show / store functions 318 */ 319 320 static ssize_t in_value_show(struct device *dev, 321 struct device_attribute *devattr, char *buf) 322 { 323 const int max_reading[3] = { 14200, 6600, 3300 }; 324 int index = to_sensor_dev_attr(devattr)->index; 325 struct fschmd_data *data = fschmd_update_device(dev); 326 327 if (data->kind == fscher || data->kind >= fschrc) 328 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref * 329 dmi_mult[index]) / 255 + dmi_offset[index]); 330 else 331 return sprintf(buf, "%d\n", (data->volt[index] * 332 max_reading[index] + 128) / 255); 333 } 334 335 336 #define TEMP_FROM_REG(val) (((val) - 128) * 1000) 337 338 static ssize_t temp_value_show(struct device *dev, 339 struct device_attribute *devattr, char *buf) 340 { 341 int index = to_sensor_dev_attr(devattr)->index; 342 struct fschmd_data *data = fschmd_update_device(dev); 343 344 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index])); 345 } 346 347 static ssize_t temp_max_show(struct device *dev, 348 struct device_attribute *devattr, char *buf) 349 { 350 int index = to_sensor_dev_attr(devattr)->index; 351 struct fschmd_data *data = fschmd_update_device(dev); 352 353 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index])); 354 } 355 356 static ssize_t temp_max_store(struct device *dev, 357 struct device_attribute *devattr, 358 const char *buf, size_t count) 359 { 360 int index = to_sensor_dev_attr(devattr)->index; 361 struct fschmd_data *data = dev_get_drvdata(dev); 362 long v; 363 int err; 364 365 err = kstrtol(buf, 10, &v); 366 if (err) 367 return err; 368 369 v = clamp_val(v / 1000, -128, 127) + 128; 370 371 mutex_lock(&data->update_lock); 372 i2c_smbus_write_byte_data(to_i2c_client(dev), 373 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v); 374 data->temp_max[index] = v; 375 mutex_unlock(&data->update_lock); 376 377 return count; 378 } 379 380 static ssize_t temp_fault_show(struct device *dev, 381 struct device_attribute *devattr, char *buf) 382 { 383 int index = to_sensor_dev_attr(devattr)->index; 384 struct fschmd_data *data = fschmd_update_device(dev); 385 386 /* bit 0 set means sensor working ok, so no fault! */ 387 if (data->temp_status[index] & FSCHMD_TEMP_WORKING) 388 return sprintf(buf, "0\n"); 389 else 390 return sprintf(buf, "1\n"); 391 } 392 393 static ssize_t temp_alarm_show(struct device *dev, 394 struct device_attribute *devattr, char *buf) 395 { 396 int index = to_sensor_dev_attr(devattr)->index; 397 struct fschmd_data *data = fschmd_update_device(dev); 398 399 if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) == 400 FSCHMD_TEMP_ALARM_MASK) 401 return sprintf(buf, "1\n"); 402 else 403 return sprintf(buf, "0\n"); 404 } 405 406 407 #define RPM_FROM_REG(val) ((val) * 60) 408 409 static ssize_t fan_value_show(struct device *dev, 410 struct device_attribute *devattr, char *buf) 411 { 412 int index = to_sensor_dev_attr(devattr)->index; 413 struct fschmd_data *data = fschmd_update_device(dev); 414 415 return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index])); 416 } 417 418 static ssize_t fan_div_show(struct device *dev, 419 struct device_attribute *devattr, char *buf) 420 { 421 int index = to_sensor_dev_attr(devattr)->index; 422 struct fschmd_data *data = fschmd_update_device(dev); 423 424 /* bits 2..7 reserved => mask with 3 */ 425 return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3)); 426 } 427 428 static ssize_t fan_div_store(struct device *dev, 429 struct device_attribute *devattr, 430 const char *buf, size_t count) 431 { 432 u8 reg; 433 int index = to_sensor_dev_attr(devattr)->index; 434 struct fschmd_data *data = dev_get_drvdata(dev); 435 /* supported values: 2, 4, 8 */ 436 unsigned long v; 437 int err; 438 439 err = kstrtoul(buf, 10, &v); 440 if (err) 441 return err; 442 443 switch (v) { 444 case 2: 445 v = 1; 446 break; 447 case 4: 448 v = 2; 449 break; 450 case 8: 451 v = 3; 452 break; 453 default: 454 dev_err(dev, 455 "fan_div value %lu not supported. Choose one of 2, 4 or 8!\n", 456 v); 457 return -EINVAL; 458 } 459 460 mutex_lock(&data->update_lock); 461 462 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), 463 FSCHMD_REG_FAN_RIPPLE[data->kind][index]); 464 465 /* bits 2..7 reserved => mask with 0x03 */ 466 reg &= ~0x03; 467 reg |= v; 468 469 i2c_smbus_write_byte_data(to_i2c_client(dev), 470 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg); 471 472 data->fan_ripple[index] = reg; 473 474 mutex_unlock(&data->update_lock); 475 476 return count; 477 } 478 479 static ssize_t fan_alarm_show(struct device *dev, 480 struct device_attribute *devattr, char *buf) 481 { 482 int index = to_sensor_dev_attr(devattr)->index; 483 struct fschmd_data *data = fschmd_update_device(dev); 484 485 if (data->fan_status[index] & FSCHMD_FAN_ALARM) 486 return sprintf(buf, "1\n"); 487 else 488 return sprintf(buf, "0\n"); 489 } 490 491 static ssize_t fan_fault_show(struct device *dev, 492 struct device_attribute *devattr, char *buf) 493 { 494 int index = to_sensor_dev_attr(devattr)->index; 495 struct fschmd_data *data = fschmd_update_device(dev); 496 497 if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT) 498 return sprintf(buf, "1\n"); 499 else 500 return sprintf(buf, "0\n"); 501 } 502 503 504 static ssize_t pwm_auto_point1_pwm_show(struct device *dev, 505 struct device_attribute *devattr, 506 char *buf) 507 { 508 int index = to_sensor_dev_attr(devattr)->index; 509 struct fschmd_data *data = fschmd_update_device(dev); 510 int val = data->fan_min[index]; 511 512 /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */ 513 if (val || data->kind == fscsyl) 514 val = val / 2 + 128; 515 516 return sprintf(buf, "%d\n", val); 517 } 518 519 static ssize_t pwm_auto_point1_pwm_store(struct device *dev, 520 struct device_attribute *devattr, 521 const char *buf, size_t count) 522 { 523 int index = to_sensor_dev_attr(devattr)->index; 524 struct fschmd_data *data = dev_get_drvdata(dev); 525 unsigned long v; 526 int err; 527 528 err = kstrtoul(buf, 10, &v); 529 if (err) 530 return err; 531 532 /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */ 533 if (v || data->kind == fscsyl) { 534 v = clamp_val(v, 128, 255); 535 v = (v - 128) * 2 + 1; 536 } 537 538 mutex_lock(&data->update_lock); 539 540 i2c_smbus_write_byte_data(to_i2c_client(dev), 541 FSCHMD_REG_FAN_MIN[data->kind][index], v); 542 data->fan_min[index] = v; 543 544 mutex_unlock(&data->update_lock); 545 546 return count; 547 } 548 549 550 /* 551 * The FSC hwmon family has the ability to force an attached alert led to flash 552 * from software, we export this as an alert_led sysfs attr 553 */ 554 static ssize_t alert_led_show(struct device *dev, 555 struct device_attribute *devattr, char *buf) 556 { 557 struct fschmd_data *data = fschmd_update_device(dev); 558 559 if (data->global_control & FSCHMD_CONTROL_ALERT_LED) 560 return sprintf(buf, "1\n"); 561 else 562 return sprintf(buf, "0\n"); 563 } 564 565 static ssize_t alert_led_store(struct device *dev, 566 struct device_attribute *devattr, const char *buf, size_t count) 567 { 568 u8 reg; 569 struct fschmd_data *data = dev_get_drvdata(dev); 570 unsigned long v; 571 int err; 572 573 err = kstrtoul(buf, 10, &v); 574 if (err) 575 return err; 576 577 mutex_lock(&data->update_lock); 578 579 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL); 580 581 if (v) 582 reg |= FSCHMD_CONTROL_ALERT_LED; 583 else 584 reg &= ~FSCHMD_CONTROL_ALERT_LED; 585 586 i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg); 587 588 data->global_control = reg; 589 590 mutex_unlock(&data->update_lock); 591 592 return count; 593 } 594 595 static DEVICE_ATTR_RW(alert_led); 596 597 static struct sensor_device_attribute fschmd_attr[] = { 598 SENSOR_ATTR_RO(in0_input, in_value, 0), 599 SENSOR_ATTR_RO(in1_input, in_value, 1), 600 SENSOR_ATTR_RO(in2_input, in_value, 2), 601 SENSOR_ATTR_RO(in3_input, in_value, 3), 602 SENSOR_ATTR_RO(in4_input, in_value, 4), 603 SENSOR_ATTR_RO(in5_input, in_value, 5), 604 }; 605 606 static struct sensor_device_attribute fschmd_temp_attr[] = { 607 SENSOR_ATTR_RO(temp1_input, temp_value, 0), 608 SENSOR_ATTR_RW(temp1_max, temp_max, 0), 609 SENSOR_ATTR_RO(temp1_fault, temp_fault, 0), 610 SENSOR_ATTR_RO(temp1_alarm, temp_alarm, 0), 611 SENSOR_ATTR_RO(temp2_input, temp_value, 1), 612 SENSOR_ATTR_RW(temp2_max, temp_max, 1), 613 SENSOR_ATTR_RO(temp2_fault, temp_fault, 1), 614 SENSOR_ATTR_RO(temp2_alarm, temp_alarm, 1), 615 SENSOR_ATTR_RO(temp3_input, temp_value, 2), 616 SENSOR_ATTR_RW(temp3_max, temp_max, 2), 617 SENSOR_ATTR_RO(temp3_fault, temp_fault, 2), 618 SENSOR_ATTR_RO(temp3_alarm, temp_alarm, 2), 619 SENSOR_ATTR_RO(temp4_input, temp_value, 3), 620 SENSOR_ATTR_RW(temp4_max, temp_max, 3), 621 SENSOR_ATTR_RO(temp4_fault, temp_fault, 3), 622 SENSOR_ATTR_RO(temp4_alarm, temp_alarm, 3), 623 SENSOR_ATTR_RO(temp5_input, temp_value, 4), 624 SENSOR_ATTR_RW(temp5_max, temp_max, 4), 625 SENSOR_ATTR_RO(temp5_fault, temp_fault, 4), 626 SENSOR_ATTR_RO(temp5_alarm, temp_alarm, 4), 627 SENSOR_ATTR_RO(temp6_input, temp_value, 5), 628 SENSOR_ATTR_RW(temp6_max, temp_max, 5), 629 SENSOR_ATTR_RO(temp6_fault, temp_fault, 5), 630 SENSOR_ATTR_RO(temp6_alarm, temp_alarm, 5), 631 SENSOR_ATTR_RO(temp7_input, temp_value, 6), 632 SENSOR_ATTR_RW(temp7_max, temp_max, 6), 633 SENSOR_ATTR_RO(temp7_fault, temp_fault, 6), 634 SENSOR_ATTR_RO(temp7_alarm, temp_alarm, 6), 635 SENSOR_ATTR_RO(temp8_input, temp_value, 7), 636 SENSOR_ATTR_RW(temp8_max, temp_max, 7), 637 SENSOR_ATTR_RO(temp8_fault, temp_fault, 7), 638 SENSOR_ATTR_RO(temp8_alarm, temp_alarm, 7), 639 SENSOR_ATTR_RO(temp9_input, temp_value, 8), 640 SENSOR_ATTR_RW(temp9_max, temp_max, 8), 641 SENSOR_ATTR_RO(temp9_fault, temp_fault, 8), 642 SENSOR_ATTR_RO(temp9_alarm, temp_alarm, 8), 643 SENSOR_ATTR_RO(temp10_input, temp_value, 9), 644 SENSOR_ATTR_RW(temp10_max, temp_max, 9), 645 SENSOR_ATTR_RO(temp10_fault, temp_fault, 9), 646 SENSOR_ATTR_RO(temp10_alarm, temp_alarm, 9), 647 SENSOR_ATTR_RO(temp11_input, temp_value, 10), 648 SENSOR_ATTR_RW(temp11_max, temp_max, 10), 649 SENSOR_ATTR_RO(temp11_fault, temp_fault, 10), 650 SENSOR_ATTR_RO(temp11_alarm, temp_alarm, 10), 651 }; 652 653 static struct sensor_device_attribute fschmd_fan_attr[] = { 654 SENSOR_ATTR_RO(fan1_input, fan_value, 0), 655 SENSOR_ATTR_RW(fan1_div, fan_div, 0), 656 SENSOR_ATTR_RO(fan1_alarm, fan_alarm, 0), 657 SENSOR_ATTR_RO(fan1_fault, fan_fault, 0), 658 SENSOR_ATTR_RW(pwm1_auto_point1_pwm, pwm_auto_point1_pwm, 0), 659 SENSOR_ATTR_RO(fan2_input, fan_value, 1), 660 SENSOR_ATTR_RW(fan2_div, fan_div, 1), 661 SENSOR_ATTR_RO(fan2_alarm, fan_alarm, 1), 662 SENSOR_ATTR_RO(fan2_fault, fan_fault, 1), 663 SENSOR_ATTR_RW(pwm2_auto_point1_pwm, pwm_auto_point1_pwm, 1), 664 SENSOR_ATTR_RO(fan3_input, fan_value, 2), 665 SENSOR_ATTR_RW(fan3_div, fan_div, 2), 666 SENSOR_ATTR_RO(fan3_alarm, fan_alarm, 2), 667 SENSOR_ATTR_RO(fan3_fault, fan_fault, 2), 668 SENSOR_ATTR_RW(pwm3_auto_point1_pwm, pwm_auto_point1_pwm, 2), 669 SENSOR_ATTR_RO(fan4_input, fan_value, 3), 670 SENSOR_ATTR_RW(fan4_div, fan_div, 3), 671 SENSOR_ATTR_RO(fan4_alarm, fan_alarm, 3), 672 SENSOR_ATTR_RO(fan4_fault, fan_fault, 3), 673 SENSOR_ATTR_RW(pwm4_auto_point1_pwm, pwm_auto_point1_pwm, 3), 674 SENSOR_ATTR_RO(fan5_input, fan_value, 4), 675 SENSOR_ATTR_RW(fan5_div, fan_div, 4), 676 SENSOR_ATTR_RO(fan5_alarm, fan_alarm, 4), 677 SENSOR_ATTR_RO(fan5_fault, fan_fault, 4), 678 SENSOR_ATTR_RW(pwm5_auto_point1_pwm, pwm_auto_point1_pwm, 4), 679 SENSOR_ATTR_RO(fan6_input, fan_value, 5), 680 SENSOR_ATTR_RW(fan6_div, fan_div, 5), 681 SENSOR_ATTR_RO(fan6_alarm, fan_alarm, 5), 682 SENSOR_ATTR_RO(fan6_fault, fan_fault, 5), 683 SENSOR_ATTR_RW(pwm6_auto_point1_pwm, pwm_auto_point1_pwm, 5), 684 SENSOR_ATTR_RO(fan7_input, fan_value, 6), 685 SENSOR_ATTR_RW(fan7_div, fan_div, 6), 686 SENSOR_ATTR_RO(fan7_alarm, fan_alarm, 6), 687 SENSOR_ATTR_RO(fan7_fault, fan_fault, 6), 688 SENSOR_ATTR_RW(pwm7_auto_point1_pwm, pwm_auto_point1_pwm, 6), 689 }; 690 691 692 /* 693 * Watchdog routines 694 */ 695 696 static int watchdog_set_timeout(struct fschmd_data *data, int timeout) 697 { 698 int ret, resolution; 699 int kind = data->kind + 1; /* 0-x array index -> 1-x module param */ 700 701 /* 2 second or 60 second resolution? */ 702 if (timeout <= 510 || kind == fscpos || kind == fscscy) 703 resolution = 2; 704 else 705 resolution = 60; 706 707 if (timeout < resolution || timeout > (resolution * 255)) 708 return -EINVAL; 709 710 mutex_lock(&data->watchdog_lock); 711 if (!data->client) { 712 ret = -ENODEV; 713 goto leave; 714 } 715 716 if (resolution == 2) 717 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION; 718 else 719 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION; 720 721 data->watchdog_preset = DIV_ROUND_UP(timeout, resolution); 722 723 /* Write new timeout value */ 724 i2c_smbus_write_byte_data(data->client, 725 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset); 726 /* Write new control register, do not trigger! */ 727 i2c_smbus_write_byte_data(data->client, 728 FSCHMD_REG_WDOG_CONTROL[data->kind], 729 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER); 730 731 ret = data->watchdog_preset * resolution; 732 733 leave: 734 mutex_unlock(&data->watchdog_lock); 735 return ret; 736 } 737 738 static int watchdog_get_timeout(struct fschmd_data *data) 739 { 740 int timeout; 741 742 mutex_lock(&data->watchdog_lock); 743 if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION) 744 timeout = data->watchdog_preset * 60; 745 else 746 timeout = data->watchdog_preset * 2; 747 mutex_unlock(&data->watchdog_lock); 748 749 return timeout; 750 } 751 752 static int watchdog_trigger(struct fschmd_data *data) 753 { 754 int ret = 0; 755 756 mutex_lock(&data->watchdog_lock); 757 if (!data->client) { 758 ret = -ENODEV; 759 goto leave; 760 } 761 762 data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER; 763 i2c_smbus_write_byte_data(data->client, 764 FSCHMD_REG_WDOG_CONTROL[data->kind], 765 data->watchdog_control); 766 leave: 767 mutex_unlock(&data->watchdog_lock); 768 return ret; 769 } 770 771 static int watchdog_stop(struct fschmd_data *data) 772 { 773 int ret = 0; 774 775 mutex_lock(&data->watchdog_lock); 776 if (!data->client) { 777 ret = -ENODEV; 778 goto leave; 779 } 780 781 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED; 782 /* 783 * Don't store the stop flag in our watchdog control register copy, as 784 * its a write only bit (read always returns 0) 785 */ 786 i2c_smbus_write_byte_data(data->client, 787 FSCHMD_REG_WDOG_CONTROL[data->kind], 788 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP); 789 leave: 790 mutex_unlock(&data->watchdog_lock); 791 return ret; 792 } 793 794 static int watchdog_open(struct inode *inode, struct file *filp) 795 { 796 struct fschmd_data *pos, *data = NULL; 797 int watchdog_is_open; 798 799 /* 800 * We get called from drivers/char/misc.c with misc_mtx hold, and we 801 * call misc_register() from fschmd_probe() with watchdog_data_mutex 802 * hold, as misc_register() takes the misc_mtx lock, this is a possible 803 * deadlock, so we use mutex_trylock here. 804 */ 805 if (!mutex_trylock(&watchdog_data_mutex)) 806 return -ERESTARTSYS; 807 list_for_each_entry(pos, &watchdog_data_list, list) { 808 if (pos->watchdog_miscdev.minor == iminor(inode)) { 809 data = pos; 810 break; 811 } 812 } 813 /* Note we can never not have found data, so we don't check for this */ 814 watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open); 815 if (!watchdog_is_open) 816 kref_get(&data->kref); 817 mutex_unlock(&watchdog_data_mutex); 818 819 if (watchdog_is_open) 820 return -EBUSY; 821 822 /* Start the watchdog */ 823 watchdog_trigger(data); 824 filp->private_data = data; 825 826 return stream_open(inode, filp); 827 } 828 829 static int watchdog_release(struct inode *inode, struct file *filp) 830 { 831 struct fschmd_data *data = filp->private_data; 832 833 if (data->watchdog_expect_close) { 834 watchdog_stop(data); 835 data->watchdog_expect_close = 0; 836 } else { 837 watchdog_trigger(data); 838 dev_crit(&data->client->dev, 839 "unexpected close, not stopping watchdog!\n"); 840 } 841 842 clear_bit(0, &data->watchdog_is_open); 843 844 mutex_lock(&watchdog_data_mutex); 845 kref_put(&data->kref, fschmd_release_resources); 846 mutex_unlock(&watchdog_data_mutex); 847 848 return 0; 849 } 850 851 static ssize_t watchdog_write(struct file *filp, const char __user *buf, 852 size_t count, loff_t *offset) 853 { 854 int ret; 855 struct fschmd_data *data = filp->private_data; 856 857 if (count) { 858 if (!nowayout) { 859 size_t i; 860 861 /* Clear it in case it was set with a previous write */ 862 data->watchdog_expect_close = 0; 863 864 for (i = 0; i != count; i++) { 865 char c; 866 if (get_user(c, buf + i)) 867 return -EFAULT; 868 if (c == 'V') 869 data->watchdog_expect_close = 1; 870 } 871 } 872 ret = watchdog_trigger(data); 873 if (ret < 0) 874 return ret; 875 } 876 return count; 877 } 878 879 static long watchdog_ioctl(struct file *filp, unsigned int cmd, 880 unsigned long arg) 881 { 882 struct watchdog_info ident = { 883 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | 884 WDIOF_CARDRESET, 885 .identity = "FSC watchdog" 886 }; 887 int i, ret = 0; 888 struct fschmd_data *data = filp->private_data; 889 890 switch (cmd) { 891 case WDIOC_GETSUPPORT: 892 ident.firmware_version = data->revision; 893 if (!nowayout) 894 ident.options |= WDIOF_MAGICCLOSE; 895 if (copy_to_user((void __user *)arg, &ident, sizeof(ident))) 896 ret = -EFAULT; 897 break; 898 899 case WDIOC_GETSTATUS: 900 ret = put_user(0, (int __user *)arg); 901 break; 902 903 case WDIOC_GETBOOTSTATUS: 904 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET) 905 ret = put_user(WDIOF_CARDRESET, (int __user *)arg); 906 else 907 ret = put_user(0, (int __user *)arg); 908 break; 909 910 case WDIOC_KEEPALIVE: 911 ret = watchdog_trigger(data); 912 break; 913 914 case WDIOC_GETTIMEOUT: 915 i = watchdog_get_timeout(data); 916 ret = put_user(i, (int __user *)arg); 917 break; 918 919 case WDIOC_SETTIMEOUT: 920 if (get_user(i, (int __user *)arg)) { 921 ret = -EFAULT; 922 break; 923 } 924 ret = watchdog_set_timeout(data, i); 925 if (ret > 0) 926 ret = put_user(ret, (int __user *)arg); 927 break; 928 929 case WDIOC_SETOPTIONS: 930 if (get_user(i, (int __user *)arg)) { 931 ret = -EFAULT; 932 break; 933 } 934 935 if (i & WDIOS_DISABLECARD) 936 ret = watchdog_stop(data); 937 else if (i & WDIOS_ENABLECARD) 938 ret = watchdog_trigger(data); 939 else 940 ret = -EINVAL; 941 942 break; 943 default: 944 ret = -ENOTTY; 945 } 946 return ret; 947 } 948 949 static const struct file_operations watchdog_fops = { 950 .owner = THIS_MODULE, 951 .llseek = no_llseek, 952 .open = watchdog_open, 953 .release = watchdog_release, 954 .write = watchdog_write, 955 .unlocked_ioctl = watchdog_ioctl, 956 .compat_ioctl = compat_ptr_ioctl, 957 }; 958 959 960 /* 961 * Detect, register, unregister and update device functions 962 */ 963 964 /* 965 * DMI decode routine to read voltage scaling factors from special DMI tables, 966 * which are available on FSC machines with an fscher or later chip. 967 */ 968 static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy) 969 { 970 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0; 971 972 /* 973 * dmi code ugliness, we get passed the address of the contents of 974 * a complete DMI record, but in the form of a dmi_header pointer, in 975 * reality this address holds header->length bytes of which the header 976 * are the first 4 bytes 977 */ 978 u8 *dmi_data = (u8 *)header; 979 980 /* We are looking for OEM-specific type 185 */ 981 if (header->type != 185) 982 return; 983 984 /* 985 * we are looking for what Siemens calls "subtype" 19, the subtype 986 * is stored in byte 5 of the dmi block 987 */ 988 if (header->length < 5 || dmi_data[4] != 19) 989 return; 990 991 /* 992 * After the subtype comes 1 unknown byte and then blocks of 5 bytes, 993 * consisting of what Siemens calls an "Entity" number, followed by 994 * 2 16-bit words in LSB first order 995 */ 996 for (i = 6; (i + 4) < header->length; i += 5) { 997 /* entity 1 - 3: voltage multiplier and offset */ 998 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) { 999 /* Our in sensors order and the DMI order differ */ 1000 const int shuffle[3] = { 1, 0, 2 }; 1001 int in = shuffle[dmi_data[i] - 1]; 1002 1003 /* Check for twice the same entity */ 1004 if (found & (1 << in)) 1005 return; 1006 1007 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8); 1008 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8); 1009 1010 found |= 1 << in; 1011 } 1012 1013 /* entity 7: reference voltage */ 1014 if (dmi_data[i] == 7) { 1015 /* Check for twice the same entity */ 1016 if (found & 0x08) 1017 return; 1018 1019 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8); 1020 1021 found |= 0x08; 1022 } 1023 } 1024 1025 if (found == 0x0F) { 1026 for (i = 0; i < 3; i++) { 1027 dmi_mult[i] = mult[i] * 10; 1028 dmi_offset[i] = offset[i] * 10; 1029 } 1030 /* 1031 * According to the docs there should be separate dmi entries 1032 * for the mult's and offsets of in3-5 of the syl, but on 1033 * my test machine these are not present 1034 */ 1035 dmi_mult[3] = dmi_mult[2]; 1036 dmi_mult[4] = dmi_mult[1]; 1037 dmi_mult[5] = dmi_mult[2]; 1038 dmi_offset[3] = dmi_offset[2]; 1039 dmi_offset[4] = dmi_offset[1]; 1040 dmi_offset[5] = dmi_offset[2]; 1041 dmi_vref = vref; 1042 } 1043 } 1044 1045 static int fschmd_detect(struct i2c_client *client, 1046 struct i2c_board_info *info) 1047 { 1048 enum chips kind; 1049 struct i2c_adapter *adapter = client->adapter; 1050 char id[4]; 1051 1052 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 1053 return -ENODEV; 1054 1055 /* Detect & Identify the chip */ 1056 id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0); 1057 id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1); 1058 id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2); 1059 id[3] = '\0'; 1060 1061 if (!strcmp(id, "PEG")) 1062 kind = fscpos; 1063 else if (!strcmp(id, "HER")) 1064 kind = fscher; 1065 else if (!strcmp(id, "SCY")) 1066 kind = fscscy; 1067 else if (!strcmp(id, "HRC")) 1068 kind = fschrc; 1069 else if (!strcmp(id, "HMD")) 1070 kind = fschmd; 1071 else if (!strcmp(id, "HDS")) 1072 kind = fschds; 1073 else if (!strcmp(id, "SYL")) 1074 kind = fscsyl; 1075 else 1076 return -ENODEV; 1077 1078 strscpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE); 1079 1080 return 0; 1081 } 1082 1083 static int fschmd_probe(struct i2c_client *client) 1084 { 1085 struct fschmd_data *data; 1086 static const char * const names[7] = { "Poseidon", "Hermes", "Scylla", 1087 "Heracles", "Heimdall", "Hades", "Syleus" }; 1088 static const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 }; 1089 int i, err; 1090 enum chips kind = i2c_match_id(fschmd_id, client)->driver_data; 1091 1092 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL); 1093 if (!data) 1094 return -ENOMEM; 1095 1096 i2c_set_clientdata(client, data); 1097 mutex_init(&data->update_lock); 1098 mutex_init(&data->watchdog_lock); 1099 INIT_LIST_HEAD(&data->list); 1100 kref_init(&data->kref); 1101 /* 1102 * Store client pointer in our data struct for watchdog usage 1103 * (where the client is found through a data ptr instead of the 1104 * otherway around) 1105 */ 1106 data->client = client; 1107 data->kind = kind; 1108 1109 if (kind == fscpos) { 1110 /* 1111 * The Poseidon has hardwired temp limits, fill these 1112 * in for the alarm resetting code 1113 */ 1114 data->temp_max[0] = 70 + 128; 1115 data->temp_max[1] = 50 + 128; 1116 data->temp_max[2] = 50 + 128; 1117 } 1118 1119 /* Read the special DMI table for fscher and newer chips */ 1120 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) { 1121 dmi_walk(fschmd_dmi_decode, NULL); 1122 if (dmi_vref == -1) { 1123 dev_warn(&client->dev, 1124 "Couldn't get voltage scaling factors from " 1125 "BIOS DMI table, using builtin defaults\n"); 1126 dmi_vref = 33; 1127 } 1128 } 1129 1130 /* Read in some never changing registers */ 1131 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION); 1132 data->global_control = i2c_smbus_read_byte_data(client, 1133 FSCHMD_REG_CONTROL); 1134 data->watchdog_control = i2c_smbus_read_byte_data(client, 1135 FSCHMD_REG_WDOG_CONTROL[data->kind]); 1136 data->watchdog_state = i2c_smbus_read_byte_data(client, 1137 FSCHMD_REG_WDOG_STATE[data->kind]); 1138 data->watchdog_preset = i2c_smbus_read_byte_data(client, 1139 FSCHMD_REG_WDOG_PRESET[data->kind]); 1140 1141 err = device_create_file(&client->dev, &dev_attr_alert_led); 1142 if (err) 1143 goto exit_detach; 1144 1145 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) { 1146 err = device_create_file(&client->dev, 1147 &fschmd_attr[i].dev_attr); 1148 if (err) 1149 goto exit_detach; 1150 } 1151 1152 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) { 1153 /* Poseidon doesn't have TEMP_LIMIT registers */ 1154 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show == 1155 temp_max_show) 1156 continue; 1157 1158 if (kind == fscsyl) { 1159 if (i % 4 == 0) 1160 data->temp_status[i / 4] = 1161 i2c_smbus_read_byte_data(client, 1162 FSCHMD_REG_TEMP_STATE 1163 [data->kind][i / 4]); 1164 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED) 1165 continue; 1166 } 1167 1168 err = device_create_file(&client->dev, 1169 &fschmd_temp_attr[i].dev_attr); 1170 if (err) 1171 goto exit_detach; 1172 } 1173 1174 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) { 1175 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */ 1176 if (kind == fscpos && 1177 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name, 1178 "pwm3_auto_point1_pwm")) 1179 continue; 1180 1181 if (kind == fscsyl) { 1182 if (i % 5 == 0) 1183 data->fan_status[i / 5] = 1184 i2c_smbus_read_byte_data(client, 1185 FSCHMD_REG_FAN_STATE 1186 [data->kind][i / 5]); 1187 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED) 1188 continue; 1189 } 1190 1191 err = device_create_file(&client->dev, 1192 &fschmd_fan_attr[i].dev_attr); 1193 if (err) 1194 goto exit_detach; 1195 } 1196 1197 data->hwmon_dev = hwmon_device_register(&client->dev); 1198 if (IS_ERR(data->hwmon_dev)) { 1199 err = PTR_ERR(data->hwmon_dev); 1200 data->hwmon_dev = NULL; 1201 goto exit_detach; 1202 } 1203 1204 /* 1205 * We take the data_mutex lock early so that watchdog_open() cannot 1206 * run when misc_register() has completed, but we've not yet added 1207 * our data to the watchdog_data_list (and set the default timeout) 1208 */ 1209 mutex_lock(&watchdog_data_mutex); 1210 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) { 1211 /* Register our watchdog part */ 1212 snprintf(data->watchdog_name, sizeof(data->watchdog_name), 1213 "watchdog%c", (i == 0) ? '\0' : ('0' + i)); 1214 data->watchdog_miscdev.name = data->watchdog_name; 1215 data->watchdog_miscdev.fops = &watchdog_fops; 1216 data->watchdog_miscdev.minor = watchdog_minors[i]; 1217 err = misc_register(&data->watchdog_miscdev); 1218 if (err == -EBUSY) 1219 continue; 1220 if (err) { 1221 data->watchdog_miscdev.minor = 0; 1222 dev_err(&client->dev, 1223 "Registering watchdog chardev: %d\n", err); 1224 break; 1225 } 1226 1227 list_add(&data->list, &watchdog_data_list); 1228 watchdog_set_timeout(data, 60); 1229 dev_info(&client->dev, 1230 "Registered watchdog chardev major 10, minor: %d\n", 1231 watchdog_minors[i]); 1232 break; 1233 } 1234 if (i == ARRAY_SIZE(watchdog_minors)) { 1235 data->watchdog_miscdev.minor = 0; 1236 dev_warn(&client->dev, 1237 "Couldn't register watchdog chardev (due to no free minor)\n"); 1238 } 1239 mutex_unlock(&watchdog_data_mutex); 1240 1241 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n", 1242 names[data->kind], (int) data->revision); 1243 1244 return 0; 1245 1246 exit_detach: 1247 fschmd_remove(client); /* will also free data for us */ 1248 return err; 1249 } 1250 1251 static void fschmd_remove(struct i2c_client *client) 1252 { 1253 struct fschmd_data *data = i2c_get_clientdata(client); 1254 int i; 1255 1256 /* Unregister the watchdog (if registered) */ 1257 if (data->watchdog_miscdev.minor) { 1258 misc_deregister(&data->watchdog_miscdev); 1259 if (data->watchdog_is_open) { 1260 dev_warn(&client->dev, 1261 "i2c client detached with watchdog open! " 1262 "Stopping watchdog.\n"); 1263 watchdog_stop(data); 1264 } 1265 mutex_lock(&watchdog_data_mutex); 1266 list_del(&data->list); 1267 mutex_unlock(&watchdog_data_mutex); 1268 /* Tell the watchdog code the client is gone */ 1269 mutex_lock(&data->watchdog_lock); 1270 data->client = NULL; 1271 mutex_unlock(&data->watchdog_lock); 1272 } 1273 1274 /* 1275 * Check if registered in case we're called from fschmd_detect 1276 * to cleanup after an error 1277 */ 1278 if (data->hwmon_dev) 1279 hwmon_device_unregister(data->hwmon_dev); 1280 1281 device_remove_file(&client->dev, &dev_attr_alert_led); 1282 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++) 1283 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr); 1284 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) 1285 device_remove_file(&client->dev, 1286 &fschmd_temp_attr[i].dev_attr); 1287 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) 1288 device_remove_file(&client->dev, 1289 &fschmd_fan_attr[i].dev_attr); 1290 1291 mutex_lock(&watchdog_data_mutex); 1292 kref_put(&data->kref, fschmd_release_resources); 1293 mutex_unlock(&watchdog_data_mutex); 1294 } 1295 1296 static struct fschmd_data *fschmd_update_device(struct device *dev) 1297 { 1298 struct i2c_client *client = to_i2c_client(dev); 1299 struct fschmd_data *data = i2c_get_clientdata(client); 1300 int i; 1301 1302 mutex_lock(&data->update_lock); 1303 1304 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { 1305 1306 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) { 1307 data->temp_act[i] = i2c_smbus_read_byte_data(client, 1308 FSCHMD_REG_TEMP_ACT[data->kind][i]); 1309 data->temp_status[i] = i2c_smbus_read_byte_data(client, 1310 FSCHMD_REG_TEMP_STATE[data->kind][i]); 1311 1312 /* The fscpos doesn't have TEMP_LIMIT registers */ 1313 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i]) 1314 data->temp_max[i] = i2c_smbus_read_byte_data( 1315 client, 1316 FSCHMD_REG_TEMP_LIMIT[data->kind][i]); 1317 1318 /* 1319 * reset alarm if the alarm condition is gone, 1320 * the chip doesn't do this itself 1321 */ 1322 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) == 1323 FSCHMD_TEMP_ALARM_MASK && 1324 data->temp_act[i] < data->temp_max[i]) 1325 i2c_smbus_write_byte_data(client, 1326 FSCHMD_REG_TEMP_STATE[data->kind][i], 1327 data->temp_status[i]); 1328 } 1329 1330 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) { 1331 data->fan_act[i] = i2c_smbus_read_byte_data(client, 1332 FSCHMD_REG_FAN_ACT[data->kind][i]); 1333 data->fan_status[i] = i2c_smbus_read_byte_data(client, 1334 FSCHMD_REG_FAN_STATE[data->kind][i]); 1335 data->fan_ripple[i] = i2c_smbus_read_byte_data(client, 1336 FSCHMD_REG_FAN_RIPPLE[data->kind][i]); 1337 1338 /* The fscpos third fan doesn't have a fan_min */ 1339 if (FSCHMD_REG_FAN_MIN[data->kind][i]) 1340 data->fan_min[i] = i2c_smbus_read_byte_data( 1341 client, 1342 FSCHMD_REG_FAN_MIN[data->kind][i]); 1343 1344 /* reset fan status if speed is back to > 0 */ 1345 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) && 1346 data->fan_act[i]) 1347 i2c_smbus_write_byte_data(client, 1348 FSCHMD_REG_FAN_STATE[data->kind][i], 1349 data->fan_status[i]); 1350 } 1351 1352 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) 1353 data->volt[i] = i2c_smbus_read_byte_data(client, 1354 FSCHMD_REG_VOLT[data->kind][i]); 1355 1356 data->last_updated = jiffies; 1357 data->valid = true; 1358 } 1359 1360 mutex_unlock(&data->update_lock); 1361 1362 return data; 1363 } 1364 1365 module_i2c_driver(fschmd_driver); 1366 1367 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 1368 MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades " 1369 "and Syleus driver"); 1370 MODULE_LICENSE("GPL"); 1371