1/* 2 * fschmd.c 3 * 4 * Copyright (C) 2007 - 2009 Hans de Goede <hdegoede@redhat.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21/* 22 * Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes, 23 * Scylla, Heracles, Heimdall, Hades and Syleus chips 24 * 25 * Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6 26 * (candidate) fschmd drivers: 27 * Copyright (C) 2006 Thilo Cestonaro 28 * <thilo.cestonaro.external@fujitsu-siemens.com> 29 * Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch> 30 * Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de> 31 * Copyright (c) 2001 Martin Knoblauch <mkn@teraport.de, knobi@knobisoft.de> 32 * Copyright (C) 2000 Hermann Jung <hej@odn.de> 33 */ 34 35#include <linux/module.h> 36#include <linux/init.h> 37#include <linux/slab.h> 38#include <linux/jiffies.h> 39#include <linux/i2c.h> 40#include <linux/hwmon.h> 41#include <linux/hwmon-sysfs.h> 42#include <linux/err.h> 43#include <linux/mutex.h> 44#include <linux/sysfs.h> 45#include <linux/dmi.h> 46#include <linux/fs.h> 47#include <linux/watchdog.h> 48#include <linux/miscdevice.h> 49#include <linux/uaccess.h> 50#include <linux/kref.h> 51 52/* Addresses to scan */ 53static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END }; 54 55/* Insmod parameters */ 56static bool nowayout = WATCHDOG_NOWAYOUT; 57module_param(nowayout, bool, 0); 58MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" 59 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 60 61enum chips { fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl }; 62 63/* 64 * The FSCHMD registers and other defines 65 */ 66 67/* chip identification */ 68#define FSCHMD_REG_IDENT_0 0x00 69#define FSCHMD_REG_IDENT_1 0x01 70#define FSCHMD_REG_IDENT_2 0x02 71#define FSCHMD_REG_REVISION 0x03 72 73/* global control and status */ 74#define FSCHMD_REG_EVENT_STATE 0x04 75#define FSCHMD_REG_CONTROL 0x05 76 77#define FSCHMD_CONTROL_ALERT_LED 0x01 78 79/* watchdog */ 80static const u8 FSCHMD_REG_WDOG_CONTROL[7] = { 81 0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 }; 82static const u8 FSCHMD_REG_WDOG_STATE[7] = { 83 0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 }; 84static const u8 FSCHMD_REG_WDOG_PRESET[7] = { 85 0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a }; 86 87#define FSCHMD_WDOG_CONTROL_TRIGGER 0x10 88#define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */ 89#define FSCHMD_WDOG_CONTROL_STOP 0x20 90#define FSCHMD_WDOG_CONTROL_RESOLUTION 0x40 91 92#define FSCHMD_WDOG_STATE_CARDRESET 0x02 93 94/* voltages, weird order is to keep the same order as the old drivers */ 95static const u8 FSCHMD_REG_VOLT[7][6] = { 96 { 0x45, 0x42, 0x48 }, /* pos */ 97 { 0x45, 0x42, 0x48 }, /* her */ 98 { 0x45, 0x42, 0x48 }, /* scy */ 99 { 0x45, 0x42, 0x48 }, /* hrc */ 100 { 0x45, 0x42, 0x48 }, /* hmd */ 101 { 0x21, 0x20, 0x22 }, /* hds */ 102 { 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 }, /* syl */ 103}; 104 105static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 }; 106 107/* 108 * minimum pwm at which the fan is driven (pwm can by increased depending on 109 * the temp. Notice that for the scy some fans share there minimum speed. 110 * Also notice that with the scy the sensor order is different than with the 111 * other chips, this order was in the 2.4 driver and kept for consistency. 112 */ 113static const u8 FSCHMD_REG_FAN_MIN[7][7] = { 114 { 0x55, 0x65 }, /* pos */ 115 { 0x55, 0x65, 0xb5 }, /* her */ 116 { 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 }, /* scy */ 117 { 0x55, 0x65, 0xa5, 0xb5 }, /* hrc */ 118 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hmd */ 119 { 0x55, 0x65, 0xa5, 0xb5, 0xc5 }, /* hds */ 120 { 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 }, /* syl */ 121}; 122 123/* actual fan speed */ 124static const u8 FSCHMD_REG_FAN_ACT[7][7] = { 125 { 0x0e, 0x6b, 0xab }, /* pos */ 126 { 0x0e, 0x6b, 0xbb }, /* her */ 127 { 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb }, /* scy */ 128 { 0x0e, 0x6b, 0xab, 0xbb }, /* hrc */ 129 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hmd */ 130 { 0x5b, 0x6b, 0xab, 0xbb, 0xcb }, /* hds */ 131 { 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 }, /* syl */ 132}; 133 134/* fan status registers */ 135static const u8 FSCHMD_REG_FAN_STATE[7][7] = { 136 { 0x0d, 0x62, 0xa2 }, /* pos */ 137 { 0x0d, 0x62, 0xb2 }, /* her */ 138 { 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 }, /* scy */ 139 { 0x0d, 0x62, 0xa2, 0xb2 }, /* hrc */ 140 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hmd */ 141 { 0x52, 0x62, 0xa2, 0xb2, 0xc2 }, /* hds */ 142 { 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 }, /* syl */ 143}; 144 145/* fan ripple / divider registers */ 146static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = { 147 { 0x0f, 0x6f, 0xaf }, /* pos */ 148 { 0x0f, 0x6f, 0xbf }, /* her */ 149 { 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf }, /* scy */ 150 { 0x0f, 0x6f, 0xaf, 0xbf }, /* hrc */ 151 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hmd */ 152 { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf }, /* hds */ 153 { 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 }, /* syl */ 154}; 155 156static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 }; 157 158/* Fan status register bitmasks */ 159#define FSCHMD_FAN_ALARM 0x04 /* called fault by FSC! */ 160#define FSCHMD_FAN_NOT_PRESENT 0x08 161#define FSCHMD_FAN_DISABLED 0x80 162 163 164/* actual temperature registers */ 165static const u8 FSCHMD_REG_TEMP_ACT[7][11] = { 166 { 0x64, 0x32, 0x35 }, /* pos */ 167 { 0x64, 0x32, 0x35 }, /* her */ 168 { 0x64, 0xD0, 0x32, 0x35 }, /* scy */ 169 { 0x64, 0x32, 0x35 }, /* hrc */ 170 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hmd */ 171 { 0x70, 0x80, 0x90, 0xd0, 0xe0 }, /* hds */ 172 { 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8, /* syl */ 173 0xb8, 0xc8, 0xd8, 0xe8, 0xf8 }, 174}; 175 176/* temperature state registers */ 177static const u8 FSCHMD_REG_TEMP_STATE[7][11] = { 178 { 0x71, 0x81, 0x91 }, /* pos */ 179 { 0x71, 0x81, 0x91 }, /* her */ 180 { 0x71, 0xd1, 0x81, 0x91 }, /* scy */ 181 { 0x71, 0x81, 0x91 }, /* hrc */ 182 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hmd */ 183 { 0x71, 0x81, 0x91, 0xd1, 0xe1 }, /* hds */ 184 { 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9, /* syl */ 185 0xb9, 0xc9, 0xd9, 0xe9, 0xf9 }, 186}; 187 188/* 189 * temperature high limit registers, FSC does not document these. Proven to be 190 * there with field testing on the fscher and fschrc, already supported / used 191 * in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers 192 * at these addresses, but doesn't want to confirm they are the same as with 193 * the fscher?? 194 */ 195static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = { 196 { 0, 0, 0 }, /* pos */ 197 { 0x76, 0x86, 0x96 }, /* her */ 198 { 0x76, 0xd6, 0x86, 0x96 }, /* scy */ 199 { 0x76, 0x86, 0x96 }, /* hrc */ 200 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hmd */ 201 { 0x76, 0x86, 0x96, 0xd6, 0xe6 }, /* hds */ 202 { 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa, /* syl */ 203 0xba, 0xca, 0xda, 0xea, 0xfa }, 204}; 205 206/* 207 * These were found through experimenting with an fscher, currently they are 208 * not used, but we keep them around for future reference. 209 * On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc), 210 * AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence 211 * the fan speed. 212 * static const u8 FSCHER_REG_TEMP_AUTOP1[] = { 0x73, 0x83, 0x93 }; 213 * static const u8 FSCHER_REG_TEMP_AUTOP2[] = { 0x75, 0x85, 0x95 }; 214 */ 215 216static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 }; 217 218/* temp status register bitmasks */ 219#define FSCHMD_TEMP_WORKING 0x01 220#define FSCHMD_TEMP_ALERT 0x02 221#define FSCHMD_TEMP_DISABLED 0x80 222/* there only really is an alarm if the sensor is working and alert == 1 */ 223#define FSCHMD_TEMP_ALARM_MASK \ 224 (FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT) 225 226/* 227 * Functions declarations 228 */ 229 230static int fschmd_probe(struct i2c_client *client, 231 const struct i2c_device_id *id); 232static int fschmd_detect(struct i2c_client *client, 233 struct i2c_board_info *info); 234static int fschmd_remove(struct i2c_client *client); 235static struct fschmd_data *fschmd_update_device(struct device *dev); 236 237/* 238 * Driver data (common to all clients) 239 */ 240 241static const struct i2c_device_id fschmd_id[] = { 242 { "fscpos", fscpos }, 243 { "fscher", fscher }, 244 { "fscscy", fscscy }, 245 { "fschrc", fschrc }, 246 { "fschmd", fschmd }, 247 { "fschds", fschds }, 248 { "fscsyl", fscsyl }, 249 { } 250}; 251MODULE_DEVICE_TABLE(i2c, fschmd_id); 252 253static struct i2c_driver fschmd_driver = { 254 .class = I2C_CLASS_HWMON, 255 .driver = { 256 .name = "fschmd", 257 }, 258 .probe = fschmd_probe, 259 .remove = fschmd_remove, 260 .id_table = fschmd_id, 261 .detect = fschmd_detect, 262 .address_list = normal_i2c, 263}; 264 265/* 266 * Client data (each client gets its own) 267 */ 268 269struct fschmd_data { 270 struct i2c_client *client; 271 struct device *hwmon_dev; 272 struct mutex update_lock; 273 struct mutex watchdog_lock; 274 struct list_head list; /* member of the watchdog_data_list */ 275 struct kref kref; 276 struct miscdevice watchdog_miscdev; 277 enum chips kind; 278 unsigned long watchdog_is_open; 279 char watchdog_expect_close; 280 char watchdog_name[10]; /* must be unique to avoid sysfs conflict */ 281 char valid; /* zero until following fields are valid */ 282 unsigned long last_updated; /* in jiffies */ 283 284 /* register values */ 285 u8 revision; /* chip revision */ 286 u8 global_control; /* global control register */ 287 u8 watchdog_control; /* watchdog control register */ 288 u8 watchdog_state; /* watchdog status register */ 289 u8 watchdog_preset; /* watchdog counter preset on trigger val */ 290 u8 volt[6]; /* voltage */ 291 u8 temp_act[11]; /* temperature */ 292 u8 temp_status[11]; /* status of sensor */ 293 u8 temp_max[11]; /* high temp limit, notice: undocumented! */ 294 u8 fan_act[7]; /* fans revolutions per second */ 295 u8 fan_status[7]; /* fan status */ 296 u8 fan_min[7]; /* fan min value for rps */ 297 u8 fan_ripple[7]; /* divider for rps */ 298}; 299 300/* 301 * Global variables to hold information read from special DMI tables, which are 302 * available on FSC machines with an fscher or later chip. There is no need to 303 * protect these with a lock as they are only modified from our attach function 304 * which always gets called with the i2c-core lock held and never accessed 305 * before the attach function is done with them. 306 */ 307static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 }; 308static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 }; 309static int dmi_vref = -1; 310 311/* 312 * Somewhat ugly :( global data pointer list with all fschmd devices, so that 313 * we can find our device data as when using misc_register there is no other 314 * method to get to ones device data from the open fop. 315 */ 316static LIST_HEAD(watchdog_data_list); 317/* Note this lock not only protect list access, but also data.kref access */ 318static DEFINE_MUTEX(watchdog_data_mutex); 319 320/* 321 * Release our data struct when we're detached from the i2c client *and* all 322 * references to our watchdog device are released 323 */ 324static void fschmd_release_resources(struct kref *ref) 325{ 326 struct fschmd_data *data = container_of(ref, struct fschmd_data, kref); 327 kfree(data); 328} 329 330/* 331 * Sysfs attr show / store functions 332 */ 333 334static ssize_t show_in_value(struct device *dev, 335 struct device_attribute *devattr, char *buf) 336{ 337 const int max_reading[3] = { 14200, 6600, 3300 }; 338 int index = to_sensor_dev_attr(devattr)->index; 339 struct fschmd_data *data = fschmd_update_device(dev); 340 341 if (data->kind == fscher || data->kind >= fschrc) 342 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref * 343 dmi_mult[index]) / 255 + dmi_offset[index]); 344 else 345 return sprintf(buf, "%d\n", (data->volt[index] * 346 max_reading[index] + 128) / 255); 347} 348 349 350#define TEMP_FROM_REG(val) (((val) - 128) * 1000) 351 352static ssize_t show_temp_value(struct device *dev, 353 struct device_attribute *devattr, char *buf) 354{ 355 int index = to_sensor_dev_attr(devattr)->index; 356 struct fschmd_data *data = fschmd_update_device(dev); 357 358 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index])); 359} 360 361static ssize_t show_temp_max(struct device *dev, 362 struct device_attribute *devattr, char *buf) 363{ 364 int index = to_sensor_dev_attr(devattr)->index; 365 struct fschmd_data *data = fschmd_update_device(dev); 366 367 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index])); 368} 369 370static ssize_t store_temp_max(struct device *dev, struct device_attribute 371 *devattr, const char *buf, size_t count) 372{ 373 int index = to_sensor_dev_attr(devattr)->index; 374 struct fschmd_data *data = dev_get_drvdata(dev); 375 long v; 376 int err; 377 378 err = kstrtol(buf, 10, &v); 379 if (err) 380 return err; 381 382 v = clamp_val(v / 1000, -128, 127) + 128; 383 384 mutex_lock(&data->update_lock); 385 i2c_smbus_write_byte_data(to_i2c_client(dev), 386 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v); 387 data->temp_max[index] = v; 388 mutex_unlock(&data->update_lock); 389 390 return count; 391} 392 393static ssize_t show_temp_fault(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 /* bit 0 set means sensor working ok, so no fault! */ 400 if (data->temp_status[index] & FSCHMD_TEMP_WORKING) 401 return sprintf(buf, "0\n"); 402 else 403 return sprintf(buf, "1\n"); 404} 405 406static ssize_t show_temp_alarm(struct device *dev, 407 struct device_attribute *devattr, char *buf) 408{ 409 int index = to_sensor_dev_attr(devattr)->index; 410 struct fschmd_data *data = fschmd_update_device(dev); 411 412 if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) == 413 FSCHMD_TEMP_ALARM_MASK) 414 return sprintf(buf, "1\n"); 415 else 416 return sprintf(buf, "0\n"); 417} 418 419 420#define RPM_FROM_REG(val) ((val) * 60) 421 422static ssize_t show_fan_value(struct device *dev, 423 struct device_attribute *devattr, char *buf) 424{ 425 int index = to_sensor_dev_attr(devattr)->index; 426 struct fschmd_data *data = fschmd_update_device(dev); 427 428 return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index])); 429} 430 431static ssize_t show_fan_div(struct device *dev, 432 struct device_attribute *devattr, char *buf) 433{ 434 int index = to_sensor_dev_attr(devattr)->index; 435 struct fschmd_data *data = fschmd_update_device(dev); 436 437 /* bits 2..7 reserved => mask with 3 */ 438 return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3)); 439} 440 441static ssize_t store_fan_div(struct device *dev, struct device_attribute 442 *devattr, const char *buf, size_t count) 443{ 444 u8 reg; 445 int index = to_sensor_dev_attr(devattr)->index; 446 struct fschmd_data *data = dev_get_drvdata(dev); 447 /* supported values: 2, 4, 8 */ 448 unsigned long v; 449 int err; 450 451 err = kstrtoul(buf, 10, &v); 452 if (err) 453 return err; 454 455 switch (v) { 456 case 2: 457 v = 1; 458 break; 459 case 4: 460 v = 2; 461 break; 462 case 8: 463 v = 3; 464 break; 465 default: 466 dev_err(dev, 467 "fan_div value %lu not supported. Choose one of 2, 4 or 8!\n", 468 v); 469 return -EINVAL; 470 } 471 472 mutex_lock(&data->update_lock); 473 474 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), 475 FSCHMD_REG_FAN_RIPPLE[data->kind][index]); 476 477 /* bits 2..7 reserved => mask with 0x03 */ 478 reg &= ~0x03; 479 reg |= v; 480 481 i2c_smbus_write_byte_data(to_i2c_client(dev), 482 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg); 483 484 data->fan_ripple[index] = reg; 485 486 mutex_unlock(&data->update_lock); 487 488 return count; 489} 490 491static ssize_t show_fan_alarm(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_ALARM) 498 return sprintf(buf, "1\n"); 499 else 500 return sprintf(buf, "0\n"); 501} 502 503static ssize_t show_fan_fault(struct device *dev, 504 struct device_attribute *devattr, char *buf) 505{ 506 int index = to_sensor_dev_attr(devattr)->index; 507 struct fschmd_data *data = fschmd_update_device(dev); 508 509 if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT) 510 return sprintf(buf, "1\n"); 511 else 512 return sprintf(buf, "0\n"); 513} 514 515 516static ssize_t show_pwm_auto_point1_pwm(struct device *dev, 517 struct device_attribute *devattr, char *buf) 518{ 519 int index = to_sensor_dev_attr(devattr)->index; 520 struct fschmd_data *data = fschmd_update_device(dev); 521 int val = data->fan_min[index]; 522 523 /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */ 524 if (val || data->kind == fscsyl) 525 val = val / 2 + 128; 526 527 return sprintf(buf, "%d\n", val); 528} 529 530static ssize_t store_pwm_auto_point1_pwm(struct device *dev, 531 struct device_attribute *devattr, const char *buf, size_t count) 532{ 533 int index = to_sensor_dev_attr(devattr)->index; 534 struct fschmd_data *data = dev_get_drvdata(dev); 535 unsigned long v; 536 int err; 537 538 err = kstrtoul(buf, 10, &v); 539 if (err) 540 return err; 541 542 /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */ 543 if (v || data->kind == fscsyl) { 544 v = clamp_val(v, 128, 255); 545 v = (v - 128) * 2 + 1; 546 } 547 548 mutex_lock(&data->update_lock); 549 550 i2c_smbus_write_byte_data(to_i2c_client(dev), 551 FSCHMD_REG_FAN_MIN[data->kind][index], v); 552 data->fan_min[index] = v; 553 554 mutex_unlock(&data->update_lock); 555 556 return count; 557} 558 559 560/* 561 * The FSC hwmon family has the ability to force an attached alert led to flash 562 * from software, we export this as an alert_led sysfs attr 563 */ 564static ssize_t show_alert_led(struct device *dev, 565 struct device_attribute *devattr, char *buf) 566{ 567 struct fschmd_data *data = fschmd_update_device(dev); 568 569 if (data->global_control & FSCHMD_CONTROL_ALERT_LED) 570 return sprintf(buf, "1\n"); 571 else 572 return sprintf(buf, "0\n"); 573} 574 575static ssize_t store_alert_led(struct device *dev, 576 struct device_attribute *devattr, const char *buf, size_t count) 577{ 578 u8 reg; 579 struct fschmd_data *data = dev_get_drvdata(dev); 580 unsigned long v; 581 int err; 582 583 err = kstrtoul(buf, 10, &v); 584 if (err) 585 return err; 586 587 mutex_lock(&data->update_lock); 588 589 reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL); 590 591 if (v) 592 reg |= FSCHMD_CONTROL_ALERT_LED; 593 else 594 reg &= ~FSCHMD_CONTROL_ALERT_LED; 595 596 i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg); 597 598 data->global_control = reg; 599 600 mutex_unlock(&data->update_lock); 601 602 return count; 603} 604 605static DEVICE_ATTR(alert_led, 0644, show_alert_led, store_alert_led); 606 607static struct sensor_device_attribute fschmd_attr[] = { 608 SENSOR_ATTR(in0_input, 0444, show_in_value, NULL, 0), 609 SENSOR_ATTR(in1_input, 0444, show_in_value, NULL, 1), 610 SENSOR_ATTR(in2_input, 0444, show_in_value, NULL, 2), 611 SENSOR_ATTR(in3_input, 0444, show_in_value, NULL, 3), 612 SENSOR_ATTR(in4_input, 0444, show_in_value, NULL, 4), 613 SENSOR_ATTR(in5_input, 0444, show_in_value, NULL, 5), 614}; 615 616static struct sensor_device_attribute fschmd_temp_attr[] = { 617 SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0), 618 SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0), 619 SENSOR_ATTR(temp1_fault, 0444, show_temp_fault, NULL, 0), 620 SENSOR_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 0), 621 SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1), 622 SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1), 623 SENSOR_ATTR(temp2_fault, 0444, show_temp_fault, NULL, 1), 624 SENSOR_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 1), 625 SENSOR_ATTR(temp3_input, 0444, show_temp_value, NULL, 2), 626 SENSOR_ATTR(temp3_max, 0644, show_temp_max, store_temp_max, 2), 627 SENSOR_ATTR(temp3_fault, 0444, show_temp_fault, NULL, 2), 628 SENSOR_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 2), 629 SENSOR_ATTR(temp4_input, 0444, show_temp_value, NULL, 3), 630 SENSOR_ATTR(temp4_max, 0644, show_temp_max, store_temp_max, 3), 631 SENSOR_ATTR(temp4_fault, 0444, show_temp_fault, NULL, 3), 632 SENSOR_ATTR(temp4_alarm, 0444, show_temp_alarm, NULL, 3), 633 SENSOR_ATTR(temp5_input, 0444, show_temp_value, NULL, 4), 634 SENSOR_ATTR(temp5_max, 0644, show_temp_max, store_temp_max, 4), 635 SENSOR_ATTR(temp5_fault, 0444, show_temp_fault, NULL, 4), 636 SENSOR_ATTR(temp5_alarm, 0444, show_temp_alarm, NULL, 4), 637 SENSOR_ATTR(temp6_input, 0444, show_temp_value, NULL, 5), 638 SENSOR_ATTR(temp6_max, 0644, show_temp_max, store_temp_max, 5), 639 SENSOR_ATTR(temp6_fault, 0444, show_temp_fault, NULL, 5), 640 SENSOR_ATTR(temp6_alarm, 0444, show_temp_alarm, NULL, 5), 641 SENSOR_ATTR(temp7_input, 0444, show_temp_value, NULL, 6), 642 SENSOR_ATTR(temp7_max, 0644, show_temp_max, store_temp_max, 6), 643 SENSOR_ATTR(temp7_fault, 0444, show_temp_fault, NULL, 6), 644 SENSOR_ATTR(temp7_alarm, 0444, show_temp_alarm, NULL, 6), 645 SENSOR_ATTR(temp8_input, 0444, show_temp_value, NULL, 7), 646 SENSOR_ATTR(temp8_max, 0644, show_temp_max, store_temp_max, 7), 647 SENSOR_ATTR(temp8_fault, 0444, show_temp_fault, NULL, 7), 648 SENSOR_ATTR(temp8_alarm, 0444, show_temp_alarm, NULL, 7), 649 SENSOR_ATTR(temp9_input, 0444, show_temp_value, NULL, 8), 650 SENSOR_ATTR(temp9_max, 0644, show_temp_max, store_temp_max, 8), 651 SENSOR_ATTR(temp9_fault, 0444, show_temp_fault, NULL, 8), 652 SENSOR_ATTR(temp9_alarm, 0444, show_temp_alarm, NULL, 8), 653 SENSOR_ATTR(temp10_input, 0444, show_temp_value, NULL, 9), 654 SENSOR_ATTR(temp10_max, 0644, show_temp_max, store_temp_max, 9), 655 SENSOR_ATTR(temp10_fault, 0444, show_temp_fault, NULL, 9), 656 SENSOR_ATTR(temp10_alarm, 0444, show_temp_alarm, NULL, 9), 657 SENSOR_ATTR(temp11_input, 0444, show_temp_value, NULL, 10), 658 SENSOR_ATTR(temp11_max, 0644, show_temp_max, store_temp_max, 10), 659 SENSOR_ATTR(temp11_fault, 0444, show_temp_fault, NULL, 10), 660 SENSOR_ATTR(temp11_alarm, 0444, show_temp_alarm, NULL, 10), 661}; 662 663static struct sensor_device_attribute fschmd_fan_attr[] = { 664 SENSOR_ATTR(fan1_input, 0444, show_fan_value, NULL, 0), 665 SENSOR_ATTR(fan1_div, 0644, show_fan_div, store_fan_div, 0), 666 SENSOR_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 0), 667 SENSOR_ATTR(fan1_fault, 0444, show_fan_fault, NULL, 0), 668 SENSOR_ATTR(pwm1_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm, 669 store_pwm_auto_point1_pwm, 0), 670 SENSOR_ATTR(fan2_input, 0444, show_fan_value, NULL, 1), 671 SENSOR_ATTR(fan2_div, 0644, show_fan_div, store_fan_div, 1), 672 SENSOR_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 1), 673 SENSOR_ATTR(fan2_fault, 0444, show_fan_fault, NULL, 1), 674 SENSOR_ATTR(pwm2_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm, 675 store_pwm_auto_point1_pwm, 1), 676 SENSOR_ATTR(fan3_input, 0444, show_fan_value, NULL, 2), 677 SENSOR_ATTR(fan3_div, 0644, show_fan_div, store_fan_div, 2), 678 SENSOR_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 2), 679 SENSOR_ATTR(fan3_fault, 0444, show_fan_fault, NULL, 2), 680 SENSOR_ATTR(pwm3_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm, 681 store_pwm_auto_point1_pwm, 2), 682 SENSOR_ATTR(fan4_input, 0444, show_fan_value, NULL, 3), 683 SENSOR_ATTR(fan4_div, 0644, show_fan_div, store_fan_div, 3), 684 SENSOR_ATTR(fan4_alarm, 0444, show_fan_alarm, NULL, 3), 685 SENSOR_ATTR(fan4_fault, 0444, show_fan_fault, NULL, 3), 686 SENSOR_ATTR(pwm4_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm, 687 store_pwm_auto_point1_pwm, 3), 688 SENSOR_ATTR(fan5_input, 0444, show_fan_value, NULL, 4), 689 SENSOR_ATTR(fan5_div, 0644, show_fan_div, store_fan_div, 4), 690 SENSOR_ATTR(fan5_alarm, 0444, show_fan_alarm, NULL, 4), 691 SENSOR_ATTR(fan5_fault, 0444, show_fan_fault, NULL, 4), 692 SENSOR_ATTR(pwm5_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm, 693 store_pwm_auto_point1_pwm, 4), 694 SENSOR_ATTR(fan6_input, 0444, show_fan_value, NULL, 5), 695 SENSOR_ATTR(fan6_div, 0644, show_fan_div, store_fan_div, 5), 696 SENSOR_ATTR(fan6_alarm, 0444, show_fan_alarm, NULL, 5), 697 SENSOR_ATTR(fan6_fault, 0444, show_fan_fault, NULL, 5), 698 SENSOR_ATTR(pwm6_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm, 699 store_pwm_auto_point1_pwm, 5), 700 SENSOR_ATTR(fan7_input, 0444, show_fan_value, NULL, 6), 701 SENSOR_ATTR(fan7_div, 0644, show_fan_div, store_fan_div, 6), 702 SENSOR_ATTR(fan7_alarm, 0444, show_fan_alarm, NULL, 6), 703 SENSOR_ATTR(fan7_fault, 0444, show_fan_fault, NULL, 6), 704 SENSOR_ATTR(pwm7_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm, 705 store_pwm_auto_point1_pwm, 6), 706}; 707 708 709/* 710 * Watchdog routines 711 */ 712 713static int watchdog_set_timeout(struct fschmd_data *data, int timeout) 714{ 715 int ret, resolution; 716 int kind = data->kind + 1; /* 0-x array index -> 1-x module param */ 717 718 /* 2 second or 60 second resolution? */ 719 if (timeout <= 510 || kind == fscpos || kind == fscscy) 720 resolution = 2; 721 else 722 resolution = 60; 723 724 if (timeout < resolution || timeout > (resolution * 255)) 725 return -EINVAL; 726 727 mutex_lock(&data->watchdog_lock); 728 if (!data->client) { 729 ret = -ENODEV; 730 goto leave; 731 } 732 733 if (resolution == 2) 734 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION; 735 else 736 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION; 737 738 data->watchdog_preset = DIV_ROUND_UP(timeout, resolution); 739 740 /* Write new timeout value */ 741 i2c_smbus_write_byte_data(data->client, 742 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset); 743 /* Write new control register, do not trigger! */ 744 i2c_smbus_write_byte_data(data->client, 745 FSCHMD_REG_WDOG_CONTROL[data->kind], 746 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER); 747 748 ret = data->watchdog_preset * resolution; 749 750leave: 751 mutex_unlock(&data->watchdog_lock); 752 return ret; 753} 754 755static int watchdog_get_timeout(struct fschmd_data *data) 756{ 757 int timeout; 758 759 mutex_lock(&data->watchdog_lock); 760 if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION) 761 timeout = data->watchdog_preset * 60; 762 else 763 timeout = data->watchdog_preset * 2; 764 mutex_unlock(&data->watchdog_lock); 765 766 return timeout; 767} 768 769static int watchdog_trigger(struct fschmd_data *data) 770{ 771 int ret = 0; 772 773 mutex_lock(&data->watchdog_lock); 774 if (!data->client) { 775 ret = -ENODEV; 776 goto leave; 777 } 778 779 data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER; 780 i2c_smbus_write_byte_data(data->client, 781 FSCHMD_REG_WDOG_CONTROL[data->kind], 782 data->watchdog_control); 783leave: 784 mutex_unlock(&data->watchdog_lock); 785 return ret; 786} 787 788static int watchdog_stop(struct fschmd_data *data) 789{ 790 int ret = 0; 791 792 mutex_lock(&data->watchdog_lock); 793 if (!data->client) { 794 ret = -ENODEV; 795 goto leave; 796 } 797 798 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED; 799 /* 800 * Don't store the stop flag in our watchdog control register copy, as 801 * its a write only bit (read always returns 0) 802 */ 803 i2c_smbus_write_byte_data(data->client, 804 FSCHMD_REG_WDOG_CONTROL[data->kind], 805 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP); 806leave: 807 mutex_unlock(&data->watchdog_lock); 808 return ret; 809} 810 811static int watchdog_open(struct inode *inode, struct file *filp) 812{ 813 struct fschmd_data *pos, *data = NULL; 814 int watchdog_is_open; 815 816 /* 817 * We get called from drivers/char/misc.c with misc_mtx hold, and we 818 * call misc_register() from fschmd_probe() with watchdog_data_mutex 819 * hold, as misc_register() takes the misc_mtx lock, this is a possible 820 * deadlock, so we use mutex_trylock here. 821 */ 822 if (!mutex_trylock(&watchdog_data_mutex)) 823 return -ERESTARTSYS; 824 list_for_each_entry(pos, &watchdog_data_list, list) { 825 if (pos->watchdog_miscdev.minor == iminor(inode)) { 826 data = pos; 827 break; 828 } 829 } 830 /* Note we can never not have found data, so we don't check for this */ 831 watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open); 832 if (!watchdog_is_open) 833 kref_get(&data->kref); 834 mutex_unlock(&watchdog_data_mutex); 835 836 if (watchdog_is_open) 837 return -EBUSY; 838 839 /* Start the watchdog */ 840 watchdog_trigger(data); 841 filp->private_data = data; 842 843 return nonseekable_open(inode, filp); 844} 845 846static int watchdog_release(struct inode *inode, struct file *filp) 847{ 848 struct fschmd_data *data = filp->private_data; 849 850 if (data->watchdog_expect_close) { 851 watchdog_stop(data); 852 data->watchdog_expect_close = 0; 853 } else { 854 watchdog_trigger(data); 855 dev_crit(&data->client->dev, 856 "unexpected close, not stopping watchdog!\n"); 857 } 858 859 clear_bit(0, &data->watchdog_is_open); 860 861 mutex_lock(&watchdog_data_mutex); 862 kref_put(&data->kref, fschmd_release_resources); 863 mutex_unlock(&watchdog_data_mutex); 864 865 return 0; 866} 867 868static ssize_t watchdog_write(struct file *filp, const char __user *buf, 869 size_t count, loff_t *offset) 870{ 871 int ret; 872 struct fschmd_data *data = filp->private_data; 873 874 if (count) { 875 if (!nowayout) { 876 size_t i; 877 878 /* Clear it in case it was set with a previous write */ 879 data->watchdog_expect_close = 0; 880 881 for (i = 0; i != count; i++) { 882 char c; 883 if (get_user(c, buf + i)) 884 return -EFAULT; 885 if (c == 'V') 886 data->watchdog_expect_close = 1; 887 } 888 } 889 ret = watchdog_trigger(data); 890 if (ret < 0) 891 return ret; 892 } 893 return count; 894} 895 896static long watchdog_ioctl(struct file *filp, unsigned int cmd, 897 unsigned long arg) 898{ 899 struct watchdog_info ident = { 900 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | 901 WDIOF_CARDRESET, 902 .identity = "FSC watchdog" 903 }; 904 int i, ret = 0; 905 struct fschmd_data *data = filp->private_data; 906 907 switch (cmd) { 908 case WDIOC_GETSUPPORT: 909 ident.firmware_version = data->revision; 910 if (!nowayout) 911 ident.options |= WDIOF_MAGICCLOSE; 912 if (copy_to_user((void __user *)arg, &ident, sizeof(ident))) 913 ret = -EFAULT; 914 break; 915 916 case WDIOC_GETSTATUS: 917 ret = put_user(0, (int __user *)arg); 918 break; 919 920 case WDIOC_GETBOOTSTATUS: 921 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET) 922 ret = put_user(WDIOF_CARDRESET, (int __user *)arg); 923 else 924 ret = put_user(0, (int __user *)arg); 925 break; 926 927 case WDIOC_KEEPALIVE: 928 ret = watchdog_trigger(data); 929 break; 930 931 case WDIOC_GETTIMEOUT: 932 i = watchdog_get_timeout(data); 933 ret = put_user(i, (int __user *)arg); 934 break; 935 936 case WDIOC_SETTIMEOUT: 937 if (get_user(i, (int __user *)arg)) { 938 ret = -EFAULT; 939 break; 940 } 941 ret = watchdog_set_timeout(data, i); 942 if (ret > 0) 943 ret = put_user(ret, (int __user *)arg); 944 break; 945 946 case WDIOC_SETOPTIONS: 947 if (get_user(i, (int __user *)arg)) { 948 ret = -EFAULT; 949 break; 950 } 951 952 if (i & WDIOS_DISABLECARD) 953 ret = watchdog_stop(data); 954 else if (i & WDIOS_ENABLECARD) 955 ret = watchdog_trigger(data); 956 else 957 ret = -EINVAL; 958 959 break; 960 default: 961 ret = -ENOTTY; 962 } 963 return ret; 964} 965 966static const struct file_operations watchdog_fops = { 967 .owner = THIS_MODULE, 968 .llseek = no_llseek, 969 .open = watchdog_open, 970 .release = watchdog_release, 971 .write = watchdog_write, 972 .unlocked_ioctl = watchdog_ioctl, 973}; 974 975 976/* 977 * Detect, register, unregister and update device functions 978 */ 979 980/* 981 * DMI decode routine to read voltage scaling factors from special DMI tables, 982 * which are available on FSC machines with an fscher or later chip. 983 */ 984static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy) 985{ 986 int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0; 987 988 /* 989 * dmi code ugliness, we get passed the address of the contents of 990 * a complete DMI record, but in the form of a dmi_header pointer, in 991 * reality this address holds header->length bytes of which the header 992 * are the first 4 bytes 993 */ 994 u8 *dmi_data = (u8 *)header; 995 996 /* We are looking for OEM-specific type 185 */ 997 if (header->type != 185) 998 return; 999 1000 /* 1001 * we are looking for what Siemens calls "subtype" 19, the subtype 1002 * is stored in byte 5 of the dmi block 1003 */ 1004 if (header->length < 5 || dmi_data[4] != 19) 1005 return; 1006 1007 /* 1008 * After the subtype comes 1 unknown byte and then blocks of 5 bytes, 1009 * consisting of what Siemens calls an "Entity" number, followed by 1010 * 2 16-bit words in LSB first order 1011 */ 1012 for (i = 6; (i + 4) < header->length; i += 5) { 1013 /* entity 1 - 3: voltage multiplier and offset */ 1014 if (dmi_data[i] >= 1 && dmi_data[i] <= 3) { 1015 /* Our in sensors order and the DMI order differ */ 1016 const int shuffle[3] = { 1, 0, 2 }; 1017 int in = shuffle[dmi_data[i] - 1]; 1018 1019 /* Check for twice the same entity */ 1020 if (found & (1 << in)) 1021 return; 1022 1023 mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8); 1024 offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8); 1025 1026 found |= 1 << in; 1027 } 1028 1029 /* entity 7: reference voltage */ 1030 if (dmi_data[i] == 7) { 1031 /* Check for twice the same entity */ 1032 if (found & 0x08) 1033 return; 1034 1035 vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8); 1036 1037 found |= 0x08; 1038 } 1039 } 1040 1041 if (found == 0x0F) { 1042 for (i = 0; i < 3; i++) { 1043 dmi_mult[i] = mult[i] * 10; 1044 dmi_offset[i] = offset[i] * 10; 1045 } 1046 /* 1047 * According to the docs there should be separate dmi entries 1048 * for the mult's and offsets of in3-5 of the syl, but on 1049 * my test machine these are not present 1050 */ 1051 dmi_mult[3] = dmi_mult[2]; 1052 dmi_mult[4] = dmi_mult[1]; 1053 dmi_mult[5] = dmi_mult[2]; 1054 dmi_offset[3] = dmi_offset[2]; 1055 dmi_offset[4] = dmi_offset[1]; 1056 dmi_offset[5] = dmi_offset[2]; 1057 dmi_vref = vref; 1058 } 1059} 1060 1061static int fschmd_detect(struct i2c_client *client, 1062 struct i2c_board_info *info) 1063{ 1064 enum chips kind; 1065 struct i2c_adapter *adapter = client->adapter; 1066 char id[4]; 1067 1068 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 1069 return -ENODEV; 1070 1071 /* Detect & Identify the chip */ 1072 id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0); 1073 id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1); 1074 id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2); 1075 id[3] = '\0'; 1076 1077 if (!strcmp(id, "PEG")) 1078 kind = fscpos; 1079 else if (!strcmp(id, "HER")) 1080 kind = fscher; 1081 else if (!strcmp(id, "SCY")) 1082 kind = fscscy; 1083 else if (!strcmp(id, "HRC")) 1084 kind = fschrc; 1085 else if (!strcmp(id, "HMD")) 1086 kind = fschmd; 1087 else if (!strcmp(id, "HDS")) 1088 kind = fschds; 1089 else if (!strcmp(id, "SYL")) 1090 kind = fscsyl; 1091 else 1092 return -ENODEV; 1093 1094 strlcpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE); 1095 1096 return 0; 1097} 1098 1099static int fschmd_probe(struct i2c_client *client, 1100 const struct i2c_device_id *id) 1101{ 1102 struct fschmd_data *data; 1103 const char * const names[7] = { "Poseidon", "Hermes", "Scylla", 1104 "Heracles", "Heimdall", "Hades", "Syleus" }; 1105 const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 }; 1106 int i, err; 1107 enum chips kind = id->driver_data; 1108 1109 data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL); 1110 if (!data) 1111 return -ENOMEM; 1112 1113 i2c_set_clientdata(client, data); 1114 mutex_init(&data->update_lock); 1115 mutex_init(&data->watchdog_lock); 1116 INIT_LIST_HEAD(&data->list); 1117 kref_init(&data->kref); 1118 /* 1119 * Store client pointer in our data struct for watchdog usage 1120 * (where the client is found through a data ptr instead of the 1121 * otherway around) 1122 */ 1123 data->client = client; 1124 data->kind = kind; 1125 1126 if (kind == fscpos) { 1127 /* 1128 * The Poseidon has hardwired temp limits, fill these 1129 * in for the alarm resetting code 1130 */ 1131 data->temp_max[0] = 70 + 128; 1132 data->temp_max[1] = 50 + 128; 1133 data->temp_max[2] = 50 + 128; 1134 } 1135 1136 /* Read the special DMI table for fscher and newer chips */ 1137 if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) { 1138 dmi_walk(fschmd_dmi_decode, NULL); 1139 if (dmi_vref == -1) { 1140 dev_warn(&client->dev, 1141 "Couldn't get voltage scaling factors from " 1142 "BIOS DMI table, using builtin defaults\n"); 1143 dmi_vref = 33; 1144 } 1145 } 1146 1147 /* Read in some never changing registers */ 1148 data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION); 1149 data->global_control = i2c_smbus_read_byte_data(client, 1150 FSCHMD_REG_CONTROL); 1151 data->watchdog_control = i2c_smbus_read_byte_data(client, 1152 FSCHMD_REG_WDOG_CONTROL[data->kind]); 1153 data->watchdog_state = i2c_smbus_read_byte_data(client, 1154 FSCHMD_REG_WDOG_STATE[data->kind]); 1155 data->watchdog_preset = i2c_smbus_read_byte_data(client, 1156 FSCHMD_REG_WDOG_PRESET[data->kind]); 1157 1158 err = device_create_file(&client->dev, &dev_attr_alert_led); 1159 if (err) 1160 goto exit_detach; 1161 1162 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) { 1163 err = device_create_file(&client->dev, 1164 &fschmd_attr[i].dev_attr); 1165 if (err) 1166 goto exit_detach; 1167 } 1168 1169 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) { 1170 /* Poseidon doesn't have TEMP_LIMIT registers */ 1171 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show == 1172 show_temp_max) 1173 continue; 1174 1175 if (kind == fscsyl) { 1176 if (i % 4 == 0) 1177 data->temp_status[i / 4] = 1178 i2c_smbus_read_byte_data(client, 1179 FSCHMD_REG_TEMP_STATE 1180 [data->kind][i / 4]); 1181 if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED) 1182 continue; 1183 } 1184 1185 err = device_create_file(&client->dev, 1186 &fschmd_temp_attr[i].dev_attr); 1187 if (err) 1188 goto exit_detach; 1189 } 1190 1191 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) { 1192 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */ 1193 if (kind == fscpos && 1194 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name, 1195 "pwm3_auto_point1_pwm")) 1196 continue; 1197 1198 if (kind == fscsyl) { 1199 if (i % 5 == 0) 1200 data->fan_status[i / 5] = 1201 i2c_smbus_read_byte_data(client, 1202 FSCHMD_REG_FAN_STATE 1203 [data->kind][i / 5]); 1204 if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED) 1205 continue; 1206 } 1207 1208 err = device_create_file(&client->dev, 1209 &fschmd_fan_attr[i].dev_attr); 1210 if (err) 1211 goto exit_detach; 1212 } 1213 1214 data->hwmon_dev = hwmon_device_register(&client->dev); 1215 if (IS_ERR(data->hwmon_dev)) { 1216 err = PTR_ERR(data->hwmon_dev); 1217 data->hwmon_dev = NULL; 1218 goto exit_detach; 1219 } 1220 1221 /* 1222 * We take the data_mutex lock early so that watchdog_open() cannot 1223 * run when misc_register() has completed, but we've not yet added 1224 * our data to the watchdog_data_list (and set the default timeout) 1225 */ 1226 mutex_lock(&watchdog_data_mutex); 1227 for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) { 1228 /* Register our watchdog part */ 1229 snprintf(data->watchdog_name, sizeof(data->watchdog_name), 1230 "watchdog%c", (i == 0) ? '\0' : ('0' + i)); 1231 data->watchdog_miscdev.name = data->watchdog_name; 1232 data->watchdog_miscdev.fops = &watchdog_fops; 1233 data->watchdog_miscdev.minor = watchdog_minors[i]; 1234 err = misc_register(&data->watchdog_miscdev); 1235 if (err == -EBUSY) 1236 continue; 1237 if (err) { 1238 data->watchdog_miscdev.minor = 0; 1239 dev_err(&client->dev, 1240 "Registering watchdog chardev: %d\n", err); 1241 break; 1242 } 1243 1244 list_add(&data->list, &watchdog_data_list); 1245 watchdog_set_timeout(data, 60); 1246 dev_info(&client->dev, 1247 "Registered watchdog chardev major 10, minor: %d\n", 1248 watchdog_minors[i]); 1249 break; 1250 } 1251 if (i == ARRAY_SIZE(watchdog_minors)) { 1252 data->watchdog_miscdev.minor = 0; 1253 dev_warn(&client->dev, 1254 "Couldn't register watchdog chardev (due to no free minor)\n"); 1255 } 1256 mutex_unlock(&watchdog_data_mutex); 1257 1258 dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n", 1259 names[data->kind], (int) data->revision); 1260 1261 return 0; 1262 1263exit_detach: 1264 fschmd_remove(client); /* will also free data for us */ 1265 return err; 1266} 1267 1268static int fschmd_remove(struct i2c_client *client) 1269{ 1270 struct fschmd_data *data = i2c_get_clientdata(client); 1271 int i; 1272 1273 /* Unregister the watchdog (if registered) */ 1274 if (data->watchdog_miscdev.minor) { 1275 misc_deregister(&data->watchdog_miscdev); 1276 if (data->watchdog_is_open) { 1277 dev_warn(&client->dev, 1278 "i2c client detached with watchdog open! " 1279 "Stopping watchdog.\n"); 1280 watchdog_stop(data); 1281 } 1282 mutex_lock(&watchdog_data_mutex); 1283 list_del(&data->list); 1284 mutex_unlock(&watchdog_data_mutex); 1285 /* Tell the watchdog code the client is gone */ 1286 mutex_lock(&data->watchdog_lock); 1287 data->client = NULL; 1288 mutex_unlock(&data->watchdog_lock); 1289 } 1290 1291 /* 1292 * Check if registered in case we're called from fschmd_detect 1293 * to cleanup after an error 1294 */ 1295 if (data->hwmon_dev) 1296 hwmon_device_unregister(data->hwmon_dev); 1297 1298 device_remove_file(&client->dev, &dev_attr_alert_led); 1299 for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++) 1300 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr); 1301 for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) 1302 device_remove_file(&client->dev, 1303 &fschmd_temp_attr[i].dev_attr); 1304 for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) 1305 device_remove_file(&client->dev, 1306 &fschmd_fan_attr[i].dev_attr); 1307 1308 mutex_lock(&watchdog_data_mutex); 1309 kref_put(&data->kref, fschmd_release_resources); 1310 mutex_unlock(&watchdog_data_mutex); 1311 1312 return 0; 1313} 1314 1315static struct fschmd_data *fschmd_update_device(struct device *dev) 1316{ 1317 struct i2c_client *client = to_i2c_client(dev); 1318 struct fschmd_data *data = i2c_get_clientdata(client); 1319 int i; 1320 1321 mutex_lock(&data->update_lock); 1322 1323 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { 1324 1325 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) { 1326 data->temp_act[i] = i2c_smbus_read_byte_data(client, 1327 FSCHMD_REG_TEMP_ACT[data->kind][i]); 1328 data->temp_status[i] = i2c_smbus_read_byte_data(client, 1329 FSCHMD_REG_TEMP_STATE[data->kind][i]); 1330 1331 /* The fscpos doesn't have TEMP_LIMIT registers */ 1332 if (FSCHMD_REG_TEMP_LIMIT[data->kind][i]) 1333 data->temp_max[i] = i2c_smbus_read_byte_data( 1334 client, 1335 FSCHMD_REG_TEMP_LIMIT[data->kind][i]); 1336 1337 /* 1338 * reset alarm if the alarm condition is gone, 1339 * the chip doesn't do this itself 1340 */ 1341 if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) == 1342 FSCHMD_TEMP_ALARM_MASK && 1343 data->temp_act[i] < data->temp_max[i]) 1344 i2c_smbus_write_byte_data(client, 1345 FSCHMD_REG_TEMP_STATE[data->kind][i], 1346 data->temp_status[i]); 1347 } 1348 1349 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) { 1350 data->fan_act[i] = i2c_smbus_read_byte_data(client, 1351 FSCHMD_REG_FAN_ACT[data->kind][i]); 1352 data->fan_status[i] = i2c_smbus_read_byte_data(client, 1353 FSCHMD_REG_FAN_STATE[data->kind][i]); 1354 data->fan_ripple[i] = i2c_smbus_read_byte_data(client, 1355 FSCHMD_REG_FAN_RIPPLE[data->kind][i]); 1356 1357 /* The fscpos third fan doesn't have a fan_min */ 1358 if (FSCHMD_REG_FAN_MIN[data->kind][i]) 1359 data->fan_min[i] = i2c_smbus_read_byte_data( 1360 client, 1361 FSCHMD_REG_FAN_MIN[data->kind][i]); 1362 1363 /* reset fan status if speed is back to > 0 */ 1364 if ((data->fan_status[i] & FSCHMD_FAN_ALARM) && 1365 data->fan_act[i]) 1366 i2c_smbus_write_byte_data(client, 1367 FSCHMD_REG_FAN_STATE[data->kind][i], 1368 data->fan_status[i]); 1369 } 1370 1371 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) 1372 data->volt[i] = i2c_smbus_read_byte_data(client, 1373 FSCHMD_REG_VOLT[data->kind][i]); 1374 1375 data->last_updated = jiffies; 1376 data->valid = 1; 1377 } 1378 1379 mutex_unlock(&data->update_lock); 1380 1381 return data; 1382} 1383 1384module_i2c_driver(fschmd_driver); 1385 1386MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 1387MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades " 1388 "and Syleus driver"); 1389MODULE_LICENSE("GPL"); 1390