drivers/hwmon/fschmd.c

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This source file includes following definitions.
fschmd_release_resources
in_value_show
temp_value_show
temp_max_show
temp_max_store
temp_fault_show
temp_alarm_show
fan_value_show
fan_div_show
fan_div_store
fan_alarm_show
fan_fault_show
pwm_auto_point1_pwm_show
pwm_auto_point1_pwm_store
alert_led_show
alert_led_store
watchdog_set_timeout
watchdog_get_timeout
watchdog_trigger
watchdog_stop
watchdog_open
watchdog_release
watchdog_write
watchdog_ioctl
fschmd_dmi_decode
fschmd_detect
fschmd_probe
fschmd_remove
fschmd_update_device
   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                         const struct i2c_device_id *id);
 219 static int fschmd_detect(struct i2c_client *client,
 220                          struct i2c_board_info *info);
 221 static int fschmd_remove(struct i2c_client *client);
 222 static struct fschmd_data *fschmd_update_device(struct device *dev);
 223 
 224 /*
 225  * Driver data (common to all clients)
 226  */
 227 
 228 static const struct i2c_device_id fschmd_id[] = {
 229         { "fscpos", fscpos },
 230         { "fscher", fscher },
 231         { "fscscy", fscscy },
 232         { "fschrc", fschrc },
 233         { "fschmd", fschmd },
 234         { "fschds", fschds },
 235         { "fscsyl", fscsyl },
 236         { }
 237 };
 238 MODULE_DEVICE_TABLE(i2c, fschmd_id);
 239 
 240 static struct i2c_driver fschmd_driver = {
 241         .class          = I2C_CLASS_HWMON,
 242         .driver = {
 243                 .name   = "fschmd",
 244         },
 245         .probe          = fschmd_probe,
 246         .remove         = fschmd_remove,
 247         .id_table       = fschmd_id,
 248         .detect         = fschmd_detect,
 249         .address_list   = normal_i2c,
 250 };
 251 
 252 /*
 253  * Client data (each client gets its own)
 254  */
 255 
 256 struct fschmd_data {
 257         struct i2c_client *client;
 258         struct device *hwmon_dev;
 259         struct mutex update_lock;
 260         struct mutex watchdog_lock;
 261         struct list_head list; /* member of the watchdog_data_list */
 262         struct kref kref;
 263         struct miscdevice watchdog_miscdev;
 264         enum chips kind;
 265         unsigned long watchdog_is_open;
 266         char watchdog_expect_close;
 267         char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
 268         char valid; /* zero until following fields are valid */
 269         unsigned long last_updated; /* in jiffies */
 270 
 271         /* register values */
 272         u8 revision;            /* chip revision */
 273         u8 global_control;      /* global control register */
 274         u8 watchdog_control;    /* watchdog control register */
 275         u8 watchdog_state;      /* watchdog status register */
 276         u8 watchdog_preset;     /* watchdog counter preset on trigger val */
 277         u8 volt[6];             /* voltage */
 278         u8 temp_act[11];        /* temperature */
 279         u8 temp_status[11];     /* status of sensor */
 280         u8 temp_max[11];        /* high temp limit, notice: undocumented! */
 281         u8 fan_act[7];          /* fans revolutions per second */
 282         u8 fan_status[7];       /* fan status */
 283         u8 fan_min[7];          /* fan min value for rps */
 284         u8 fan_ripple[7];       /* divider for rps */
 285 };
 286 
 287 /*
 288  * Global variables to hold information read from special DMI tables, which are
 289  * available on FSC machines with an fscher or later chip. There is no need to
 290  * protect these with a lock as they are only modified from our attach function
 291  * which always gets called with the i2c-core lock held and never accessed
 292  * before the attach function is done with them.
 293  */
 294 static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
 295 static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
 296 static int dmi_vref = -1;
 297 
 298 /*
 299  * Somewhat ugly :( global data pointer list with all fschmd devices, so that
 300  * we can find our device data as when using misc_register there is no other
 301  * method to get to ones device data from the open fop.
 302  */
 303 static LIST_HEAD(watchdog_data_list);
 304 /* Note this lock not only protect list access, but also data.kref access */
 305 static DEFINE_MUTEX(watchdog_data_mutex);
 306 
 307 /*
 308  * Release our data struct when we're detached from the i2c client *and* all
 309  * references to our watchdog device are released
 310  */
 311 static void fschmd_release_resources(struct kref *ref)
 312 {
 313         struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
 314         kfree(data);
 315 }
 316 
 317 /*
 318  * Sysfs attr show / store functions
 319  */
 320 
 321 static ssize_t in_value_show(struct device *dev,
 322                              struct device_attribute *devattr, char *buf)
 323 {
 324         const int max_reading[3] = { 14200, 6600, 3300 };
 325         int index = to_sensor_dev_attr(devattr)->index;
 326         struct fschmd_data *data = fschmd_update_device(dev);
 327 
 328         if (data->kind == fscher || data->kind >= fschrc)
 329                 return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref *
 330                         dmi_mult[index]) / 255 + dmi_offset[index]);
 331         else
 332                 return sprintf(buf, "%d\n", (data->volt[index] *
 333                         max_reading[index] + 128) / 255);
 334 }
 335 
 336 
 337 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 338 
 339 static ssize_t temp_value_show(struct device *dev,
 340                                struct device_attribute *devattr, char *buf)
 341 {
 342         int index = to_sensor_dev_attr(devattr)->index;
 343         struct fschmd_data *data = fschmd_update_device(dev);
 344 
 345         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index]));
 346 }
 347 
 348 static ssize_t temp_max_show(struct device *dev,
 349                              struct device_attribute *devattr, char *buf)
 350 {
 351         int index = to_sensor_dev_attr(devattr)->index;
 352         struct fschmd_data *data = fschmd_update_device(dev);
 353 
 354         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
 355 }
 356 
 357 static ssize_t temp_max_store(struct device *dev,
 358                               struct device_attribute *devattr,
 359                               const char *buf, size_t count)
 360 {
 361         int index = to_sensor_dev_attr(devattr)->index;
 362         struct fschmd_data *data = dev_get_drvdata(dev);
 363         long v;
 364         int err;
 365 
 366         err = kstrtol(buf, 10, &v);
 367         if (err)
 368                 return err;
 369 
 370         v = clamp_val(v / 1000, -128, 127) + 128;
 371 
 372         mutex_lock(&data->update_lock);
 373         i2c_smbus_write_byte_data(to_i2c_client(dev),
 374                 FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
 375         data->temp_max[index] = v;
 376         mutex_unlock(&data->update_lock);
 377 
 378         return count;
 379 }
 380 
 381 static ssize_t temp_fault_show(struct device *dev,
 382                                struct device_attribute *devattr, char *buf)
 383 {
 384         int index = to_sensor_dev_attr(devattr)->index;
 385         struct fschmd_data *data = fschmd_update_device(dev);
 386 
 387         /* bit 0 set means sensor working ok, so no fault! */
 388         if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
 389                 return sprintf(buf, "0\n");
 390         else
 391                 return sprintf(buf, "1\n");
 392 }
 393 
 394 static ssize_t temp_alarm_show(struct device *dev,
 395                                struct device_attribute *devattr, char *buf)
 396 {
 397         int index = to_sensor_dev_attr(devattr)->index;
 398         struct fschmd_data *data = fschmd_update_device(dev);
 399 
 400         if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
 401                         FSCHMD_TEMP_ALARM_MASK)
 402                 return sprintf(buf, "1\n");
 403         else
 404                 return sprintf(buf, "0\n");
 405 }
 406 
 407 
 408 #define RPM_FROM_REG(val)       ((val) * 60)
 409 
 410 static ssize_t fan_value_show(struct device *dev,
 411                               struct device_attribute *devattr, char *buf)
 412 {
 413         int index = to_sensor_dev_attr(devattr)->index;
 414         struct fschmd_data *data = fschmd_update_device(dev);
 415 
 416         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index]));
 417 }
 418 
 419 static ssize_t fan_div_show(struct device *dev,
 420                             struct device_attribute *devattr, char *buf)
 421 {
 422         int index = to_sensor_dev_attr(devattr)->index;
 423         struct fschmd_data *data = fschmd_update_device(dev);
 424 
 425         /* bits 2..7 reserved => mask with 3 */
 426         return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3));
 427 }
 428 
 429 static ssize_t fan_div_store(struct device *dev,
 430                              struct device_attribute *devattr,
 431                              const char *buf, size_t count)
 432 {
 433         u8 reg;
 434         int index = to_sensor_dev_attr(devattr)->index;
 435         struct fschmd_data *data = dev_get_drvdata(dev);
 436         /* supported values: 2, 4, 8 */
 437         unsigned long v;
 438         int err;
 439 
 440         err = kstrtoul(buf, 10, &v);
 441         if (err)
 442                 return err;
 443 
 444         switch (v) {
 445         case 2:
 446                 v = 1;
 447                 break;
 448         case 4:
 449                 v = 2;
 450                 break;
 451         case 8:
 452                 v = 3;
 453                 break;
 454         default:
 455                 dev_err(dev,
 456                         "fan_div value %lu not supported. Choose one of 2, 4 or 8!\n",
 457                         v);
 458                 return -EINVAL;
 459         }
 460 
 461         mutex_lock(&data->update_lock);
 462 
 463         reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
 464                 FSCHMD_REG_FAN_RIPPLE[data->kind][index]);
 465 
 466         /* bits 2..7 reserved => mask with 0x03 */
 467         reg &= ~0x03;
 468         reg |= v;
 469 
 470         i2c_smbus_write_byte_data(to_i2c_client(dev),
 471                 FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);
 472 
 473         data->fan_ripple[index] = reg;
 474 
 475         mutex_unlock(&data->update_lock);
 476 
 477         return count;
 478 }
 479 
 480 static ssize_t fan_alarm_show(struct device *dev,
 481                               struct device_attribute *devattr, char *buf)
 482 {
 483         int index = to_sensor_dev_attr(devattr)->index;
 484         struct fschmd_data *data = fschmd_update_device(dev);
 485 
 486         if (data->fan_status[index] & FSCHMD_FAN_ALARM)
 487                 return sprintf(buf, "1\n");
 488         else
 489                 return sprintf(buf, "0\n");
 490 }
 491 
 492 static ssize_t fan_fault_show(struct device *dev,
 493                               struct device_attribute *devattr, char *buf)
 494 {
 495         int index = to_sensor_dev_attr(devattr)->index;
 496         struct fschmd_data *data = fschmd_update_device(dev);
 497 
 498         if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
 499                 return sprintf(buf, "1\n");
 500         else
 501                 return sprintf(buf, "0\n");
 502 }
 503 
 504 
 505 static ssize_t pwm_auto_point1_pwm_show(struct device *dev,
 506                                         struct device_attribute *devattr,
 507                                         char *buf)
 508 {
 509         int index = to_sensor_dev_attr(devattr)->index;
 510         struct fschmd_data *data = fschmd_update_device(dev);
 511         int val = data->fan_min[index];
 512 
 513         /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
 514         if (val || data->kind == fscsyl)
 515                 val = val / 2 + 128;
 516 
 517         return sprintf(buf, "%d\n", val);
 518 }
 519 
 520 static ssize_t pwm_auto_point1_pwm_store(struct device *dev,
 521                                          struct device_attribute *devattr,
 522                                          const char *buf, size_t count)
 523 {
 524         int index = to_sensor_dev_attr(devattr)->index;
 525         struct fschmd_data *data = dev_get_drvdata(dev);
 526         unsigned long v;
 527         int err;
 528 
 529         err = kstrtoul(buf, 10, &v);
 530         if (err)
 531                 return err;
 532 
 533         /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
 534         if (v || data->kind == fscsyl) {
 535                 v = clamp_val(v, 128, 255);
 536                 v = (v - 128) * 2 + 1;
 537         }
 538 
 539         mutex_lock(&data->update_lock);
 540 
 541         i2c_smbus_write_byte_data(to_i2c_client(dev),
 542                 FSCHMD_REG_FAN_MIN[data->kind][index], v);
 543         data->fan_min[index] = v;
 544 
 545         mutex_unlock(&data->update_lock);
 546 
 547         return count;
 548 }
 549 
 550 
 551 /*
 552  * The FSC hwmon family has the ability to force an attached alert led to flash
 553  * from software, we export this as an alert_led sysfs attr
 554  */
 555 static ssize_t alert_led_show(struct device *dev,
 556         struct device_attribute *devattr, char *buf)
 557 {
 558         struct fschmd_data *data = fschmd_update_device(dev);
 559 
 560         if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
 561                 return sprintf(buf, "1\n");
 562         else
 563                 return sprintf(buf, "0\n");
 564 }
 565 
 566 static ssize_t alert_led_store(struct device *dev,
 567         struct device_attribute *devattr, const char *buf, size_t count)
 568 {
 569         u8 reg;
 570         struct fschmd_data *data = dev_get_drvdata(dev);
 571         unsigned long v;
 572         int err;
 573 
 574         err = kstrtoul(buf, 10, &v);
 575         if (err)
 576                 return err;
 577 
 578         mutex_lock(&data->update_lock);
 579 
 580         reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);
 581 
 582         if (v)
 583                 reg |= FSCHMD_CONTROL_ALERT_LED;
 584         else
 585                 reg &= ~FSCHMD_CONTROL_ALERT_LED;
 586 
 587         i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);
 588 
 589         data->global_control = reg;
 590 
 591         mutex_unlock(&data->update_lock);
 592 
 593         return count;
 594 }
 595 
 596 static DEVICE_ATTR_RW(alert_led);
 597 
 598 static struct sensor_device_attribute fschmd_attr[] = {
 599         SENSOR_ATTR_RO(in0_input, in_value, 0),
 600         SENSOR_ATTR_RO(in1_input, in_value, 1),
 601         SENSOR_ATTR_RO(in2_input, in_value, 2),
 602         SENSOR_ATTR_RO(in3_input, in_value, 3),
 603         SENSOR_ATTR_RO(in4_input, in_value, 4),
 604         SENSOR_ATTR_RO(in5_input, in_value, 5),
 605 };
 606 
 607 static struct sensor_device_attribute fschmd_temp_attr[] = {
 608         SENSOR_ATTR_RO(temp1_input, temp_value, 0),
 609         SENSOR_ATTR_RW(temp1_max, temp_max, 0),
 610         SENSOR_ATTR_RO(temp1_fault, temp_fault, 0),
 611         SENSOR_ATTR_RO(temp1_alarm, temp_alarm, 0),
 612         SENSOR_ATTR_RO(temp2_input, temp_value, 1),
 613         SENSOR_ATTR_RW(temp2_max, temp_max, 1),
 614         SENSOR_ATTR_RO(temp2_fault, temp_fault, 1),
 615         SENSOR_ATTR_RO(temp2_alarm, temp_alarm, 1),
 616         SENSOR_ATTR_RO(temp3_input, temp_value, 2),
 617         SENSOR_ATTR_RW(temp3_max, temp_max, 2),
 618         SENSOR_ATTR_RO(temp3_fault, temp_fault, 2),
 619         SENSOR_ATTR_RO(temp3_alarm, temp_alarm, 2),
 620         SENSOR_ATTR_RO(temp4_input, temp_value, 3),
 621         SENSOR_ATTR_RW(temp4_max, temp_max, 3),
 622         SENSOR_ATTR_RO(temp4_fault, temp_fault, 3),
 623         SENSOR_ATTR_RO(temp4_alarm, temp_alarm, 3),
 624         SENSOR_ATTR_RO(temp5_input, temp_value, 4),
 625         SENSOR_ATTR_RW(temp5_max, temp_max, 4),
 626         SENSOR_ATTR_RO(temp5_fault, temp_fault, 4),
 627         SENSOR_ATTR_RO(temp5_alarm, temp_alarm, 4),
 628         SENSOR_ATTR_RO(temp6_input, temp_value, 5),
 629         SENSOR_ATTR_RW(temp6_max, temp_max, 5),
 630         SENSOR_ATTR_RO(temp6_fault, temp_fault, 5),
 631         SENSOR_ATTR_RO(temp6_alarm, temp_alarm, 5),
 632         SENSOR_ATTR_RO(temp7_input, temp_value, 6),
 633         SENSOR_ATTR_RW(temp7_max, temp_max, 6),
 634         SENSOR_ATTR_RO(temp7_fault, temp_fault, 6),
 635         SENSOR_ATTR_RO(temp7_alarm, temp_alarm, 6),
 636         SENSOR_ATTR_RO(temp8_input, temp_value, 7),
 637         SENSOR_ATTR_RW(temp8_max, temp_max, 7),
 638         SENSOR_ATTR_RO(temp8_fault, temp_fault, 7),
 639         SENSOR_ATTR_RO(temp8_alarm, temp_alarm, 7),
 640         SENSOR_ATTR_RO(temp9_input, temp_value, 8),
 641         SENSOR_ATTR_RW(temp9_max, temp_max, 8),
 642         SENSOR_ATTR_RO(temp9_fault, temp_fault, 8),
 643         SENSOR_ATTR_RO(temp9_alarm, temp_alarm, 8),
 644         SENSOR_ATTR_RO(temp10_input, temp_value, 9),
 645         SENSOR_ATTR_RW(temp10_max, temp_max, 9),
 646         SENSOR_ATTR_RO(temp10_fault, temp_fault, 9),
 647         SENSOR_ATTR_RO(temp10_alarm, temp_alarm, 9),
 648         SENSOR_ATTR_RO(temp11_input, temp_value, 10),
 649         SENSOR_ATTR_RW(temp11_max, temp_max, 10),
 650         SENSOR_ATTR_RO(temp11_fault, temp_fault, 10),
 651         SENSOR_ATTR_RO(temp11_alarm, temp_alarm, 10),
 652 };
 653 
 654 static struct sensor_device_attribute fschmd_fan_attr[] = {
 655         SENSOR_ATTR_RO(fan1_input, fan_value, 0),
 656         SENSOR_ATTR_RW(fan1_div, fan_div, 0),
 657         SENSOR_ATTR_RO(fan1_alarm, fan_alarm, 0),
 658         SENSOR_ATTR_RO(fan1_fault, fan_fault, 0),
 659         SENSOR_ATTR_RW(pwm1_auto_point1_pwm, pwm_auto_point1_pwm, 0),
 660         SENSOR_ATTR_RO(fan2_input, fan_value, 1),
 661         SENSOR_ATTR_RW(fan2_div, fan_div, 1),
 662         SENSOR_ATTR_RO(fan2_alarm, fan_alarm, 1),
 663         SENSOR_ATTR_RO(fan2_fault, fan_fault, 1),
 664         SENSOR_ATTR_RW(pwm2_auto_point1_pwm, pwm_auto_point1_pwm, 1),
 665         SENSOR_ATTR_RO(fan3_input, fan_value, 2),
 666         SENSOR_ATTR_RW(fan3_div, fan_div, 2),
 667         SENSOR_ATTR_RO(fan3_alarm, fan_alarm, 2),
 668         SENSOR_ATTR_RO(fan3_fault, fan_fault, 2),
 669         SENSOR_ATTR_RW(pwm3_auto_point1_pwm, pwm_auto_point1_pwm, 2),
 670         SENSOR_ATTR_RO(fan4_input, fan_value, 3),
 671         SENSOR_ATTR_RW(fan4_div, fan_div, 3),
 672         SENSOR_ATTR_RO(fan4_alarm, fan_alarm, 3),
 673         SENSOR_ATTR_RO(fan4_fault, fan_fault, 3),
 674         SENSOR_ATTR_RW(pwm4_auto_point1_pwm, pwm_auto_point1_pwm, 3),
 675         SENSOR_ATTR_RO(fan5_input, fan_value, 4),
 676         SENSOR_ATTR_RW(fan5_div, fan_div, 4),
 677         SENSOR_ATTR_RO(fan5_alarm, fan_alarm, 4),
 678         SENSOR_ATTR_RO(fan5_fault, fan_fault, 4),
 679         SENSOR_ATTR_RW(pwm5_auto_point1_pwm, pwm_auto_point1_pwm, 4),
 680         SENSOR_ATTR_RO(fan6_input, fan_value, 5),
 681         SENSOR_ATTR_RW(fan6_div, fan_div, 5),
 682         SENSOR_ATTR_RO(fan6_alarm, fan_alarm, 5),
 683         SENSOR_ATTR_RO(fan6_fault, fan_fault, 5),
 684         SENSOR_ATTR_RW(pwm6_auto_point1_pwm, pwm_auto_point1_pwm, 5),
 685         SENSOR_ATTR_RO(fan7_input, fan_value, 6),
 686         SENSOR_ATTR_RW(fan7_div, fan_div, 6),
 687         SENSOR_ATTR_RO(fan7_alarm, fan_alarm, 6),
 688         SENSOR_ATTR_RO(fan7_fault, fan_fault, 6),
 689         SENSOR_ATTR_RW(pwm7_auto_point1_pwm, pwm_auto_point1_pwm, 6),
 690 };
 691 
 692 
 693 /*
 694  * Watchdog routines
 695  */
 696 
 697 static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
 698 {
 699         int ret, resolution;
 700         int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
 701 
 702         /* 2 second or 60 second resolution? */
 703         if (timeout <= 510 || kind == fscpos || kind == fscscy)
 704                 resolution = 2;
 705         else
 706                 resolution = 60;
 707 
 708         if (timeout < resolution || timeout > (resolution * 255))
 709                 return -EINVAL;
 710 
 711         mutex_lock(&data->watchdog_lock);
 712         if (!data->client) {
 713                 ret = -ENODEV;
 714                 goto leave;
 715         }
 716 
 717         if (resolution == 2)
 718                 data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
 719         else
 720                 data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
 721 
 722         data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
 723 
 724         /* Write new timeout value */
 725         i2c_smbus_write_byte_data(data->client,
 726                 FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
 727         /* Write new control register, do not trigger! */
 728         i2c_smbus_write_byte_data(data->client,
 729                 FSCHMD_REG_WDOG_CONTROL[data->kind],
 730                 data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
 731 
 732         ret = data->watchdog_preset * resolution;
 733 
 734 leave:
 735         mutex_unlock(&data->watchdog_lock);
 736         return ret;
 737 }
 738 
 739 static int watchdog_get_timeout(struct fschmd_data *data)
 740 {
 741         int timeout;
 742 
 743         mutex_lock(&data->watchdog_lock);
 744         if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
 745                 timeout = data->watchdog_preset * 60;
 746         else
 747                 timeout = data->watchdog_preset * 2;
 748         mutex_unlock(&data->watchdog_lock);
 749 
 750         return timeout;
 751 }
 752 
 753 static int watchdog_trigger(struct fschmd_data *data)
 754 {
 755         int ret = 0;
 756 
 757         mutex_lock(&data->watchdog_lock);
 758         if (!data->client) {
 759                 ret = -ENODEV;
 760                 goto leave;
 761         }
 762 
 763         data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
 764         i2c_smbus_write_byte_data(data->client,
 765                                   FSCHMD_REG_WDOG_CONTROL[data->kind],
 766                                   data->watchdog_control);
 767 leave:
 768         mutex_unlock(&data->watchdog_lock);
 769         return ret;
 770 }
 771 
 772 static int watchdog_stop(struct fschmd_data *data)
 773 {
 774         int ret = 0;
 775 
 776         mutex_lock(&data->watchdog_lock);
 777         if (!data->client) {
 778                 ret = -ENODEV;
 779                 goto leave;
 780         }
 781 
 782         data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
 783         /*
 784          * Don't store the stop flag in our watchdog control register copy, as
 785          * its a write only bit (read always returns 0)
 786          */
 787         i2c_smbus_write_byte_data(data->client,
 788                 FSCHMD_REG_WDOG_CONTROL[data->kind],
 789                 data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
 790 leave:
 791         mutex_unlock(&data->watchdog_lock);
 792         return ret;
 793 }
 794 
 795 static int watchdog_open(struct inode *inode, struct file *filp)
 796 {
 797         struct fschmd_data *pos, *data = NULL;
 798         int watchdog_is_open;
 799 
 800         /*
 801          * We get called from drivers/char/misc.c with misc_mtx hold, and we
 802          * call misc_register() from fschmd_probe() with watchdog_data_mutex
 803          * hold, as misc_register() takes the misc_mtx lock, this is a possible
 804          * deadlock, so we use mutex_trylock here.
 805          */
 806         if (!mutex_trylock(&watchdog_data_mutex))
 807                 return -ERESTARTSYS;
 808         list_for_each_entry(pos, &watchdog_data_list, list) {
 809                 if (pos->watchdog_miscdev.minor == iminor(inode)) {
 810                         data = pos;
 811                         break;
 812                 }
 813         }
 814         /* Note we can never not have found data, so we don't check for this */
 815         watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
 816         if (!watchdog_is_open)
 817                 kref_get(&data->kref);
 818         mutex_unlock(&watchdog_data_mutex);
 819 
 820         if (watchdog_is_open)
 821                 return -EBUSY;
 822 
 823         /* Start the watchdog */
 824         watchdog_trigger(data);
 825         filp->private_data = data;
 826 
 827         return stream_open(inode, filp);
 828 }
 829 
 830 static int watchdog_release(struct inode *inode, struct file *filp)
 831 {
 832         struct fschmd_data *data = filp->private_data;
 833 
 834         if (data->watchdog_expect_close) {
 835                 watchdog_stop(data);
 836                 data->watchdog_expect_close = 0;
 837         } else {
 838                 watchdog_trigger(data);
 839                 dev_crit(&data->client->dev,
 840                         "unexpected close, not stopping watchdog!\n");
 841         }
 842 
 843         clear_bit(0, &data->watchdog_is_open);
 844 
 845         mutex_lock(&watchdog_data_mutex);
 846         kref_put(&data->kref, fschmd_release_resources);
 847         mutex_unlock(&watchdog_data_mutex);
 848 
 849         return 0;
 850 }
 851 
 852 static ssize_t watchdog_write(struct file *filp, const char __user *buf,
 853         size_t count, loff_t *offset)
 854 {
 855         int ret;
 856         struct fschmd_data *data = filp->private_data;
 857 
 858         if (count) {
 859                 if (!nowayout) {
 860                         size_t i;
 861 
 862                         /* Clear it in case it was set with a previous write */
 863                         data->watchdog_expect_close = 0;
 864 
 865                         for (i = 0; i != count; i++) {
 866                                 char c;
 867                                 if (get_user(c, buf + i))
 868                                         return -EFAULT;
 869                                 if (c == 'V')
 870                                         data->watchdog_expect_close = 1;
 871                         }
 872                 }
 873                 ret = watchdog_trigger(data);
 874                 if (ret < 0)
 875                         return ret;
 876         }
 877         return count;
 878 }
 879 
 880 static long watchdog_ioctl(struct file *filp, unsigned int cmd,
 881                            unsigned long arg)
 882 {
 883         struct watchdog_info ident = {
 884                 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
 885                                 WDIOF_CARDRESET,
 886                 .identity = "FSC watchdog"
 887         };
 888         int i, ret = 0;
 889         struct fschmd_data *data = filp->private_data;
 890 
 891         switch (cmd) {
 892         case WDIOC_GETSUPPORT:
 893                 ident.firmware_version = data->revision;
 894                 if (!nowayout)
 895                         ident.options |= WDIOF_MAGICCLOSE;
 896                 if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
 897                         ret = -EFAULT;
 898                 break;
 899 
 900         case WDIOC_GETSTATUS:
 901                 ret = put_user(0, (int __user *)arg);
 902                 break;
 903 
 904         case WDIOC_GETBOOTSTATUS:
 905                 if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
 906                         ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
 907                 else
 908                         ret = put_user(0, (int __user *)arg);
 909                 break;
 910 
 911         case WDIOC_KEEPALIVE:
 912                 ret = watchdog_trigger(data);
 913                 break;
 914 
 915         case WDIOC_GETTIMEOUT:
 916                 i = watchdog_get_timeout(data);
 917                 ret = put_user(i, (int __user *)arg);
 918                 break;
 919 
 920         case WDIOC_SETTIMEOUT:
 921                 if (get_user(i, (int __user *)arg)) {
 922                         ret = -EFAULT;
 923                         break;
 924                 }
 925                 ret = watchdog_set_timeout(data, i);
 926                 if (ret > 0)
 927                         ret = put_user(ret, (int __user *)arg);
 928                 break;
 929 
 930         case WDIOC_SETOPTIONS:
 931                 if (get_user(i, (int __user *)arg)) {
 932                         ret = -EFAULT;
 933                         break;
 934                 }
 935 
 936                 if (i & WDIOS_DISABLECARD)
 937                         ret = watchdog_stop(data);
 938                 else if (i & WDIOS_ENABLECARD)
 939                         ret = watchdog_trigger(data);
 940                 else
 941                         ret = -EINVAL;
 942 
 943                 break;
 944         default:
 945                 ret = -ENOTTY;
 946         }
 947         return ret;
 948 }
 949 
 950 static const struct file_operations watchdog_fops = {
 951         .owner = THIS_MODULE,
 952         .llseek = no_llseek,
 953         .open = watchdog_open,
 954         .release = watchdog_release,
 955         .write = watchdog_write,
 956         .unlocked_ioctl = watchdog_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         strlcpy(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                         const struct i2c_device_id *id)
1085 {
1086         struct fschmd_data *data;
1087         const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
1088                                 "Heracles", "Heimdall", "Hades", "Syleus" };
1089         const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
1090         int i, err;
1091         enum chips kind = id->driver_data;
1092 
1093         data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
1094         if (!data)
1095                 return -ENOMEM;
1096 
1097         i2c_set_clientdata(client, data);
1098         mutex_init(&data->update_lock);
1099         mutex_init(&data->watchdog_lock);
1100         INIT_LIST_HEAD(&data->list);
1101         kref_init(&data->kref);
1102         /*
1103          * Store client pointer in our data struct for watchdog usage
1104          * (where the client is found through a data ptr instead of the
1105          * otherway around)
1106          */
1107         data->client = client;
1108         data->kind = kind;
1109 
1110         if (kind == fscpos) {
1111                 /*
1112                  * The Poseidon has hardwired temp limits, fill these
1113                  * in for the alarm resetting code
1114                  */
1115                 data->temp_max[0] = 70 + 128;
1116                 data->temp_max[1] = 50 + 128;
1117                 data->temp_max[2] = 50 + 128;
1118         }
1119 
1120         /* Read the special DMI table for fscher and newer chips */
1121         if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
1122                 dmi_walk(fschmd_dmi_decode, NULL);
1123                 if (dmi_vref == -1) {
1124                         dev_warn(&client->dev,
1125                                 "Couldn't get voltage scaling factors from "
1126                                 "BIOS DMI table, using builtin defaults\n");
1127                         dmi_vref = 33;
1128                 }
1129         }
1130 
1131         /* Read in some never changing registers */
1132         data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
1133         data->global_control = i2c_smbus_read_byte_data(client,
1134                                         FSCHMD_REG_CONTROL);
1135         data->watchdog_control = i2c_smbus_read_byte_data(client,
1136                                         FSCHMD_REG_WDOG_CONTROL[data->kind]);
1137         data->watchdog_state = i2c_smbus_read_byte_data(client,
1138                                         FSCHMD_REG_WDOG_STATE[data->kind]);
1139         data->watchdog_preset = i2c_smbus_read_byte_data(client,
1140                                         FSCHMD_REG_WDOG_PRESET[data->kind]);
1141 
1142         err = device_create_file(&client->dev, &dev_attr_alert_led);
1143         if (err)
1144                 goto exit_detach;
1145 
1146         for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
1147                 err = device_create_file(&client->dev,
1148                                         &fschmd_attr[i].dev_attr);
1149                 if (err)
1150                         goto exit_detach;
1151         }
1152 
1153         for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
1154                 /* Poseidon doesn't have TEMP_LIMIT registers */
1155                 if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
1156                                 temp_max_show)
1157                         continue;
1158 
1159                 if (kind == fscsyl) {
1160                         if (i % 4 == 0)
1161                                 data->temp_status[i / 4] =
1162                                         i2c_smbus_read_byte_data(client,
1163                                                 FSCHMD_REG_TEMP_STATE
1164                                                 [data->kind][i / 4]);
1165                         if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
1166                                 continue;
1167                 }
1168 
1169                 err = device_create_file(&client->dev,
1170                                         &fschmd_temp_attr[i].dev_attr);
1171                 if (err)
1172                         goto exit_detach;
1173         }
1174 
1175         for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
1176                 /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
1177                 if (kind == fscpos &&
1178                                 !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
1179                                         "pwm3_auto_point1_pwm"))
1180                         continue;
1181 
1182                 if (kind == fscsyl) {
1183                         if (i % 5 == 0)
1184                                 data->fan_status[i / 5] =
1185                                         i2c_smbus_read_byte_data(client,
1186                                                 FSCHMD_REG_FAN_STATE
1187                                                 [data->kind][i / 5]);
1188                         if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
1189                                 continue;
1190                 }
1191 
1192                 err = device_create_file(&client->dev,
1193                                         &fschmd_fan_attr[i].dev_attr);
1194                 if (err)
1195                         goto exit_detach;
1196         }
1197 
1198         data->hwmon_dev = hwmon_device_register(&client->dev);
1199         if (IS_ERR(data->hwmon_dev)) {
1200                 err = PTR_ERR(data->hwmon_dev);
1201                 data->hwmon_dev = NULL;
1202                 goto exit_detach;
1203         }
1204 
1205         /*
1206          * We take the data_mutex lock early so that watchdog_open() cannot
1207          * run when misc_register() has completed, but we've not yet added
1208          * our data to the watchdog_data_list (and set the default timeout)
1209          */
1210         mutex_lock(&watchdog_data_mutex);
1211         for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1212                 /* Register our watchdog part */
1213                 snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1214                         "watchdog%c", (i == 0) ? '\0' : ('0' + i));
1215                 data->watchdog_miscdev.name = data->watchdog_name;
1216                 data->watchdog_miscdev.fops = &watchdog_fops;
1217                 data->watchdog_miscdev.minor = watchdog_minors[i];
1218                 err = misc_register(&data->watchdog_miscdev);
1219                 if (err == -EBUSY)
1220                         continue;
1221                 if (err) {
1222                         data->watchdog_miscdev.minor = 0;
1223                         dev_err(&client->dev,
1224                                 "Registering watchdog chardev: %d\n", err);
1225                         break;
1226                 }
1227 
1228                 list_add(&data->list, &watchdog_data_list);
1229                 watchdog_set_timeout(data, 60);
1230                 dev_info(&client->dev,
1231                         "Registered watchdog chardev major 10, minor: %d\n",
1232                         watchdog_minors[i]);
1233                 break;
1234         }
1235         if (i == ARRAY_SIZE(watchdog_minors)) {
1236                 data->watchdog_miscdev.minor = 0;
1237                 dev_warn(&client->dev,
1238                          "Couldn't register watchdog chardev (due to no free minor)\n");
1239         }
1240         mutex_unlock(&watchdog_data_mutex);
1241 
1242         dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
1243                 names[data->kind], (int) data->revision);
1244 
1245         return 0;
1246 
1247 exit_detach:
1248         fschmd_remove(client); /* will also free data for us */
1249         return err;
1250 }
1251 
1252 static int fschmd_remove(struct i2c_client *client)
1253 {
1254         struct fschmd_data *data = i2c_get_clientdata(client);
1255         int i;
1256 
1257         /* Unregister the watchdog (if registered) */
1258         if (data->watchdog_miscdev.minor) {
1259                 misc_deregister(&data->watchdog_miscdev);
1260                 if (data->watchdog_is_open) {
1261                         dev_warn(&client->dev,
1262                                 "i2c client detached with watchdog open! "
1263                                 "Stopping watchdog.\n");
1264                         watchdog_stop(data);
1265                 }
1266                 mutex_lock(&watchdog_data_mutex);
1267                 list_del(&data->list);
1268                 mutex_unlock(&watchdog_data_mutex);
1269                 /* Tell the watchdog code the client is gone */
1270                 mutex_lock(&data->watchdog_lock);
1271                 data->client = NULL;
1272                 mutex_unlock(&data->watchdog_lock);
1273         }
1274 
1275         /*
1276          * Check if registered in case we're called from fschmd_detect
1277          * to cleanup after an error
1278          */
1279         if (data->hwmon_dev)
1280                 hwmon_device_unregister(data->hwmon_dev);
1281 
1282         device_remove_file(&client->dev, &dev_attr_alert_led);
1283         for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
1284                 device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
1285         for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
1286                 device_remove_file(&client->dev,
1287                                         &fschmd_temp_attr[i].dev_attr);
1288         for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
1289                 device_remove_file(&client->dev,
1290                                         &fschmd_fan_attr[i].dev_attr);
1291 
1292         mutex_lock(&watchdog_data_mutex);
1293         kref_put(&data->kref, fschmd_release_resources);
1294         mutex_unlock(&watchdog_data_mutex);
1295 
1296         return 0;
1297 }
1298 
1299 static struct fschmd_data *fschmd_update_device(struct device *dev)
1300 {
1301         struct i2c_client *client = to_i2c_client(dev);
1302         struct fschmd_data *data = i2c_get_clientdata(client);
1303         int i;
1304 
1305         mutex_lock(&data->update_lock);
1306 
1307         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
1308 
1309                 for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
1310                         data->temp_act[i] = i2c_smbus_read_byte_data(client,
1311                                         FSCHMD_REG_TEMP_ACT[data->kind][i]);
1312                         data->temp_status[i] = i2c_smbus_read_byte_data(client,
1313                                         FSCHMD_REG_TEMP_STATE[data->kind][i]);
1314 
1315                         /* The fscpos doesn't have TEMP_LIMIT registers */
1316                         if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
1317                                 data->temp_max[i] = i2c_smbus_read_byte_data(
1318                                         client,
1319                                         FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
1320 
1321                         /*
1322                          * reset alarm if the alarm condition is gone,
1323                          * the chip doesn't do this itself
1324                          */
1325                         if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
1326                                         FSCHMD_TEMP_ALARM_MASK &&
1327                                         data->temp_act[i] < data->temp_max[i])
1328                                 i2c_smbus_write_byte_data(client,
1329                                         FSCHMD_REG_TEMP_STATE[data->kind][i],
1330                                         data->temp_status[i]);
1331                 }
1332 
1333                 for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
1334                         data->fan_act[i] = i2c_smbus_read_byte_data(client,
1335                                         FSCHMD_REG_FAN_ACT[data->kind][i]);
1336                         data->fan_status[i] = i2c_smbus_read_byte_data(client,
1337                                         FSCHMD_REG_FAN_STATE[data->kind][i]);
1338                         data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
1339                                         FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
1340 
1341                         /* The fscpos third fan doesn't have a fan_min */
1342                         if (FSCHMD_REG_FAN_MIN[data->kind][i])
1343                                 data->fan_min[i] = i2c_smbus_read_byte_data(
1344                                         client,
1345                                         FSCHMD_REG_FAN_MIN[data->kind][i]);
1346 
1347                         /* reset fan status if speed is back to > 0 */
1348                         if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
1349                                         data->fan_act[i])
1350                                 i2c_smbus_write_byte_data(client,
1351                                         FSCHMD_REG_FAN_STATE[data->kind][i],
1352                                         data->fan_status[i]);
1353                 }
1354 
1355                 for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
1356                         data->volt[i] = i2c_smbus_read_byte_data(client,
1357                                                FSCHMD_REG_VOLT[data->kind][i]);
1358 
1359                 data->last_updated = jiffies;
1360                 data->valid = 1;
1361         }
1362 
1363         mutex_unlock(&data->update_lock);
1364 
1365         return data;
1366 }
1367 
1368 module_i2c_driver(fschmd_driver);
1369 
1370 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1371 MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
1372                         "and Syleus driver");
1373 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/hwmon/fschmd.c

DEFINITIONS
