linux/drivers/macintosh/therm_adt746x.c
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   1/*
   2 * Device driver for the i2c thermostat found on the iBook G4, Albook G4
   3 *
   4 * Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt
   5 *
   6 * Documentation from 115254175ADT7467_pra.pdf and 3686221171167ADT7460_b.pdf
   7 * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7467
   8 * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7460
   9 *
  10 */
  11
  12#include <linux/types.h>
  13#include <linux/module.h>
  14#include <linux/errno.h>
  15#include <linux/kernel.h>
  16#include <linux/delay.h>
  17#include <linux/sched.h>
  18#include <linux/i2c.h>
  19#include <linux/slab.h>
  20#include <linux/init.h>
  21#include <linux/spinlock.h>
  22#include <linux/wait.h>
  23#include <linux/suspend.h>
  24#include <linux/kthread.h>
  25#include <linux/moduleparam.h>
  26#include <linux/freezer.h>
  27#include <linux/of_platform.h>
  28
  29#include <asm/prom.h>
  30#include <asm/machdep.h>
  31#include <asm/io.h>
  32#include <asm/sections.h>
  33
  34#undef DEBUG
  35
  36#define CONFIG_REG   0x40
  37#define MANUAL_MASK  0xe0
  38#define AUTO_MASK    0x20
  39#define INVERT_MASK  0x10
  40
  41static u8 TEMP_REG[3]    = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
  42static u8 LIMIT_REG[3]   = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
  43static u8 MANUAL_MODE[2] = {0x5c, 0x5d};       
  44static u8 REM_CONTROL[2] = {0x00, 0x40};
  45static u8 FAN_SPEED[2]   = {0x28, 0x2a};
  46static u8 FAN_SPD_SET[2] = {0x30, 0x31};
  47
  48static u8 default_limits_local[3] = {70, 50, 70};    /* local, sensor1, sensor2 */
  49static u8 default_limits_chip[3] = {80, 65, 80};    /* local, sensor1, sensor2 */
  50static const char *sensor_location[3] = { "?", "?", "?" };
  51
  52static int limit_adjust;
  53static int fan_speed = -1;
  54static bool verbose;
  55
  56MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
  57MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and "
  58                   "Powerbook G4 Alu");
  59MODULE_LICENSE("GPL");
  60
  61module_param(limit_adjust, int, 0644);
  62MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) "
  63                 "by N degrees.");
  64
  65module_param(fan_speed, int, 0644);
  66MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
  67                 "(default 64)");
  68
  69module_param(verbose, bool, 0);
  70MODULE_PARM_DESC(verbose,"Verbose log operations "
  71                 "(default 0)");
  72
  73struct thermostat {
  74        struct i2c_client       *clt;
  75        u8                      temps[3];
  76        u8                      cached_temp[3];
  77        u8                      initial_limits[3];
  78        u8                      limits[3];
  79        int                     last_speed[2];
  80        int                     last_var[2];
  81        int                     pwm_inv[2];
  82        struct task_struct      *thread;
  83        struct platform_device  *pdev;
  84        enum {
  85                ADT7460,
  86                ADT7467
  87        }                       type;
  88};
  89
  90static void write_both_fan_speed(struct thermostat *th, int speed);
  91static void write_fan_speed(struct thermostat *th, int speed, int fan);
  92
  93static int
  94write_reg(struct thermostat* th, int reg, u8 data)
  95{
  96        u8 tmp[2];
  97        int rc;
  98        
  99        tmp[0] = reg;
 100        tmp[1] = data;
 101        rc = i2c_master_send(th->clt, (const char *)tmp, 2);
 102        if (rc < 0)
 103                return rc;
 104        if (rc != 2)
 105                return -ENODEV;
 106        return 0;
 107}
 108
 109static int
 110read_reg(struct thermostat* th, int reg)
 111{
 112        u8 reg_addr, data;
 113        int rc;
 114
 115        reg_addr = (u8)reg;
 116        rc = i2c_master_send(th->clt, &reg_addr, 1);
 117        if (rc < 0)
 118                return rc;
 119        if (rc != 1)
 120                return -ENODEV;
 121        rc = i2c_master_recv(th->clt, (char *)&data, 1);
 122        if (rc < 0)
 123                return rc;
 124        return data;
 125}
 126
 127static int read_fan_speed(struct thermostat *th, u8 addr)
 128{
 129        u8 tmp[2];
 130        u16 res;
 131        
 132        /* should start with low byte */
 133        tmp[1] = read_reg(th, addr);
 134        tmp[0] = read_reg(th, addr + 1);
 135        
 136        res = tmp[1] + (tmp[0] << 8);
 137        /* "a value of 0xffff means that the fan has stopped" */
 138        return (res == 0xffff ? 0 : (90000*60)/res);
 139}
 140
 141static void write_both_fan_speed(struct thermostat *th, int speed)
 142{
 143        write_fan_speed(th, speed, 0);
 144        if (th->type == ADT7460)
 145                write_fan_speed(th, speed, 1);
 146}
 147
 148static void write_fan_speed(struct thermostat *th, int speed, int fan)
 149{
 150        u8 manual;
 151        
 152        if (speed > 0xff) 
 153                speed = 0xff;
 154        else if (speed < -1) 
 155                speed = 0;
 156        
 157        if (th->type == ADT7467 && fan == 1)
 158                return;
 159        
 160        if (th->last_speed[fan] != speed) {
 161                if (verbose) {
 162                        if (speed == -1)
 163                                printk(KERN_DEBUG "adt746x: Setting speed to automatic "
 164                                        "for %s fan.\n", sensor_location[fan+1]);
 165                        else
 166                                printk(KERN_DEBUG "adt746x: Setting speed to %d "
 167                                        "for %s fan.\n", speed, sensor_location[fan+1]);
 168                }
 169        } else
 170                return;
 171        
 172        if (speed >= 0) {
 173                manual = read_reg(th, MANUAL_MODE[fan]);
 174                manual &= ~INVERT_MASK;
 175                write_reg(th, MANUAL_MODE[fan],
 176                        manual | MANUAL_MASK | th->pwm_inv[fan]);
 177                write_reg(th, FAN_SPD_SET[fan], speed);
 178        } else {
 179                /* back to automatic */
 180                if(th->type == ADT7460) {
 181                        manual = read_reg(th,
 182                                MANUAL_MODE[fan]) & (~MANUAL_MASK);
 183                        manual &= ~INVERT_MASK;
 184                        manual |= th->pwm_inv[fan];
 185                        write_reg(th,
 186                                MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
 187                } else {
 188                        manual = read_reg(th, MANUAL_MODE[fan]);
 189                        manual &= ~INVERT_MASK;
 190                        manual |= th->pwm_inv[fan];
 191                        write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
 192                }
 193        }
 194        
 195        th->last_speed[fan] = speed;                    
 196}
 197
 198static void read_sensors(struct thermostat *th)
 199{
 200        int i = 0;
 201
 202        for (i = 0; i < 3; i++)
 203                th->temps[i]  = read_reg(th, TEMP_REG[i]);
 204}
 205
 206#ifdef DEBUG
 207static void display_stats(struct thermostat *th)
 208{
 209        if (th->temps[0] != th->cached_temp[0]
 210        ||  th->temps[1] != th->cached_temp[1]
 211        ||  th->temps[2] != th->cached_temp[2]) {
 212                printk(KERN_INFO "adt746x: Temperature infos:"
 213                                 " thermostats: %d,%d,%d;"
 214                                 " limits: %d,%d,%d;"
 215                                 " fan speed: %d RPM\n",
 216                                 th->temps[0], th->temps[1], th->temps[2],
 217                                 th->limits[0],  th->limits[1],  th->limits[2],
 218                                 read_fan_speed(th, FAN_SPEED[0]));
 219        }
 220        th->cached_temp[0] = th->temps[0];
 221        th->cached_temp[1] = th->temps[1];
 222        th->cached_temp[2] = th->temps[2];
 223}
 224#endif
 225
 226static void update_fans_speed (struct thermostat *th)
 227{
 228        int lastvar = 0; /* last variation, for iBook */
 229        int i = 0;
 230
 231        /* we don't care about local sensor, so we start at sensor 1 */
 232        for (i = 1; i < 3; i++) {
 233                int started = 0;
 234                int fan_number = (th->type == ADT7460 && i == 2);
 235                int var = th->temps[i] - th->limits[i];
 236
 237                if (var > -1) {
 238                        int step = (255 - fan_speed) / 7;
 239                        int new_speed = 0;
 240
 241                        /* hysteresis : change fan speed only if variation is
 242                         * more than two degrees */
 243                        if (abs(var - th->last_var[fan_number]) < 2)
 244                                continue;
 245
 246                        started = 1;
 247                        new_speed = fan_speed + ((var-1)*step);
 248
 249                        if (new_speed < fan_speed)
 250                                new_speed = fan_speed;
 251                        if (new_speed > 255)
 252                                new_speed = 255;
 253
 254                        if (verbose)
 255                                printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
 256                                                 "(limit exceeded by %d on %s)\n",
 257                                                new_speed, var,
 258                                                sensor_location[fan_number+1]);
 259                        write_both_fan_speed(th, new_speed);
 260                        th->last_var[fan_number] = var;
 261                } else if (var < -2) {
 262                        /* don't stop fan if sensor2 is cold and sensor1 is not
 263                         * so cold (lastvar >= -1) */
 264                        if (i == 2 && lastvar < -1) {
 265                                if (th->last_speed[fan_number] != 0)
 266                                        if (verbose)
 267                                                printk(KERN_DEBUG "adt746x: Stopping "
 268                                                        "fans.\n");
 269                                write_both_fan_speed(th, 0);
 270                        }
 271                }
 272
 273                lastvar = var;
 274
 275                if (started)
 276                        return; /* we don't want to re-stop the fan
 277                                * if sensor1 is heating and sensor2 is not */
 278        }
 279}
 280
 281static int monitor_task(void *arg)
 282{
 283        struct thermostat* th = arg;
 284
 285         286        while(! 287                try_to=set_fe();
 288                 289
 290#ifndef DEBUG
 291                if (fan_speed != -1)
 292                        read_sensors(th);
 293#else
 294                read_sensors(th);
 295#endif          
 296
 297                if (fan_speed != -1)
 298                        update_fans_speed(th);
 299
 300#ifdef DEBUG
 301                display_stats(th);
 302#endif
 303
 304        }
 305
 306        return 0;
 307}
 308
 309static void thermostat *th, int i)
 310{
 311        /* Set sensor1 limit higher to avoid powerdowns */
 312        th->limits[i] = i] + limit_adjust;
 313        write_reg(th, LIMIT_REG[i], th->limits[i]);
 314                
 315        /* ode our limits to normal */
 316        th->limits[i] = i] + limit_adjust;
 317}
 318
 319#define BUILD_SHOW_FUNC_INT(name,  320static ##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 321{                                                               \
 322        struct thermostat *th = dev);           \
 323        return oprintf(buf, "%d\n",  324}
 325
 326#define BUILD_SHOW_FUNC_INT_LITE(name,  327static ##name(struct device *dev, struct device_attribute *attr, char *buf)        \
 328{                                                               \
 329        return oprintf(buf, "%d\n",  330}
 331
 332#define BUILD_SHOW_FUNC_STR(name,  333static ##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 334{                                                               \
 335        return oprintf(buf, "%s\n",  336}
 337
 338#define BUILD_SHOW_FUNC_FAN(name,  339static ##name(struct device *dev, struct device_attribute *attr, char *buf)       \
 340{                                                               \
 341        struct thermostat *th = dev);           \
 342        return oprintf(buf, "%d (%d rpm)\n",                    \
 343                th->last_speed[ 344                read_fan_speed(th, FAN_SPEED[ 345                );                                              \
 346}
 347
 348#define BUILD_STORE_FUNC_DEG(name,  349static ##name(struct device *dev, struct device_attribute *attr, const char *buf, n) \
 350{                                                               \
 351        struct thermostat *th = dev);           \
 352        int  353        int i;                                                  \
 354        (buf, NULL, 10);                     \
 355        printk(KERN_INFO "Adjusting limits by %d degrees\n",  356        limit_adjust =  357        for (i=0; i < 3; i++)                                   \
 358                th, i);                               \
 359        return n;                                               \
 360}
 361
 362#define BUILD_STORE_FUNC_INT(name,  363static ##name(struct device *dev, struct device_attribute *attr, const char *buf, n) \
 364{                                                               \
 365        int  366        (buf, NULL, 10);                     \
 367        if ( > 255)                               \
 368                return -EINVAL;                                 \
 369        printk(KERN_INFO "Setting specified fan speed to %d\n",  370        ;                                             \
 371        return n;                                               \
 372}
 373
 374BUILD_SHOW_FUNC_INT(read_reg(th, TEMP_REG[1])))
 375BUILD_SHOW_FUNC_INT(read_reg(th, TEMP_REG[2])))
 376BUILD_SHOW_FUNC_INT(th->limits[1])
 377BUILD_SHOW_FUNC_INT(th->limits[2])
 378BUILD_SHOW_FUNC_STR(sensor1_location,            sensor_location[1])
 379BUILD_SHOW_FUNC_STR(sensor2_location,            sensor_location[2])
 380
 381BUILD_SHOW_FUNC_INT_LITE(specified_fan_speed, fan_speed)
 382BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
 383
 384BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,   0)
 385BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,   1)
 386
 387BUILD_SHOW_FUNC_INT_LITE(limit_adjust,   limit_adjust)
 388BUILD_STORE_FUNC_DEG(limit_adjust,       th)
 389                
 390static DEVICE_ATTR(S_IRUGO,
 391                   NULL);
 392static DEVICE_ATTR(S_IRUGO,
 393                   NULL);
 394static DEVICE_ATTR(S_IRUGO,
 395                   NULL);
 396static DEVICE_ATTR(S_IRUGO,
 397                   NULL);
 398static DEVICE_ATTR(sensor1_location, S_IRUGO,
 399                   show_sensor1_location, NULL);
 400static DEVICE_ATTR(sensor2_location, S_IRUGO,
 401                   show_sensor2_location, NULL);
 402
 403static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 404                   show_specified_fan_speed,store_specified_fan_speed);
 405
 406static DEVICE_ATTR(sensor1_fan_speed,   S_IRUGO,
 407                   show_sensor1_fan_speed,      NULL);
 408static DEVICE_ATTR(sensor2_fan_speed,   S_IRUGO,
 409                   show_sensor2_fan_speed,      NULL);
 410
 411static DEVICE_ATTR(limit_adjust,        S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
 412                   show_limit_adjust,   store_limit_adjust);
 413
 414static void thermostat_create_files(struct thermostat *th)
 415{
 416        struct device_node *th->clt->dev.of_node;
 417        struct device *dev;
 418        int err;
 419
 420        /* To maintain ABI compatibility with userspace, create
 421         * the old style platform driver and attach the attributes
 422         * to it here
 423         */
 424        th->pdev = of_platform_device_create("temperatur s", NULL);
 425        if (!th->pdev)
 426                return;
 427        dev = &th->pdev->dev;
 428        dev, th);
 429        err = device_create_file(dev, & 430        err |= device_create_file(dev, & 431        err |= device_create_file(dev, & 432        err |= device_create_file(dev, & 433        err |= device_create_file(dev, &dev_attr_sensor1_location);
 434        err |= device_create_file(dev, &dev_attr_sensor2_location);
 435        err |= device_create_file(dev, &dev_attr_limit_adjust);
 436        err |= device_create_file(dev, &dev_attr_specified_fan_speed);
 437        err |= device_create_file(dev, &dev_attr_sensor1_fan_speed);
 438        if(th->type == ADT7460)
 439                err |= device_create_file(dev, &dev_attr_sensor2_fan_speed);
 440        if (err)
 441                printk(KERN_WARNING
 442                        "Failed to create temperatur  attribute file(s).\n");
 443}
 444
 445static void thermostat_remove_files(struct thermostat *th)
 446{
 447        struct device *dev;
 448
 449        if (!th->pdev)
 450                return;
 451        dev = &th->pdev->dev;
 452        device_remove_file(dev, & 453        device_remove_file(dev, & 454        device_remove_file(dev, & 455        device_remove_file(dev, & 456        device_remove_file(dev, &dev_attr_sensor1_location);
 457        device_remove_file(dev, &dev_attr_sensor2_location);
 458        device_remove_file(dev, &dev_attr_limit_adjust);
 459        device_remove_file(dev, &dev_attr_specified_fan_speed);
 460        device_remove_file(dev, &dev_attr_sensor1_fan_speed);   
 461        if (th->type == ADT7460)
 462                device_remove_file(dev, &dev_attr_sensor2_fan_speed);
 463        of_device_unregister(th->pdev);
 464
 465}
 466
 467static int probe_thermostat(struct i2c_client *client,
 468                            const struct i2c_device_id *id)
 469{
 470        struct device_node *client->dev.of_node;
 471        struct thermostat* th;
 472        const __be32 * 473        int i, rc, vers, offset = 0;
 474
 475        if (! 476                return -ENXIO;
 477        of_gde=property("hwsensor-params-version", NULL);
 478        if (! 479                return -ENXIO;
 480        vers = );
 481        printk(KERN_INFO "adt746x: version %d (%ssupported)\n",
 482               vers, vers == 1 ? "" : "un");
 483        if (vers != 1)
 484                return -ENXIO;
 485
 486        if (of_gde=property("hwsensor-location", NULL)) {
 487                for (i = 0; i < 3; i++) {
 488                        sensor_location[i] = of_gde=property( 489                                        "hwsensor-location", NULL) + offset;
 490
 491                        if (sensor_location[i] == NULL)
 492                                sensor_location[i] = "";
 493
 494                        printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
 495                        offset += strlen(sensor_location[i]) + 1;
 496                }
 497        }
 498
 499        th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
 500        if (!th)
 501                return -ENOMEM;
 502
 503        client, th);
 504        th->clt = client;
 505        th->type = id-> 506
 507        rc = read_reg(th, CONFIG_REG);
 508        if (rc < 0) {
 509                dev_err(&client->dev, "Thermostat failed to read config!\n");
 510                kfree(th);
 511                return -ENODEV;
 512        }
 513
 514        /* force manual control to start the fan quieter */
 515        if (fan_speed == -1)
 516                fan_speed = 64;
 517        
 518        if (th->type == ADT7460) {
 519                printk(KERN_INFO "adt746x: ADT7460 initializing\n");
 520                /* The 7460 needs to be started explicitly */
 521                write_reg(th, CONFIG_REG, 1);
 522        } else
 523                printk(KERN_INFO "adt746x: ADT7467 initializing\n");
 524
 525        for (i = 0; i < 3; i++) {
 526                th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
 527                th, i);
 528        }
 529
 530        printk(KERN_INFO "adt746x: Lowering max temperatur s from %d, %d, %d"
 531                         " to %d, %d, %d\n",
 532                         th->initial_limits[0], th->initial_limits[1],
 533                         th->initial_limits[2], th->limits[0], th->limits[1],
 534                         th->limits[2]);
 535
 536        /* record invert bit status because fw can corrupt it after suspend */
 537        th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
 538        th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;
 539
 540        /* be sur  to really write fan speed the first time */
 541        th->last_speed[0] = -2;
 542        th->last_speed[1] = -2;
 543        th->last_var[0] = -80;
 544        th->last_var[1] = -80;
 545
 546        if (fan_speed != -1) {
 547                /* manual mode, stop fans */
 548                write_both_fan_speed(th, 0);
 549        } else {
 550                /* automatic mode */
 551                write_both_fan_speed(th, -1);
 552        }
 553        
 554        th->thread = kthread_run(monitor_task, th, "kfand");
 555        if (th->thread == ERR_PTR(-ENOMEM)) {
 556                printk(KERN_INFO "adt746x: Kthread creation failed\n");
 557                th->thread = NULL;
 558                return -ENOMEM;
 559        }
 560
 561        thermostat_create_files(th);
 562
 563        return 0;
 564}
 565
 566static int remove_thermostat(struct i2c_client *client)
 567{
 568        struct thermostat *th = client);
 569        int i;
 570        
 571        thermostat_remove_files(th);
 572
 573        if (th->thread != NULL)
 574                kthread_stop(th->thread);
 575
 576        printk(KERN_INFO "adt746x: Putting max temperatur s back from "
 577                         "%d, %d, %d to %d, %d, %d\n",
 578                th->limits[0], th->limits[1], th->limits[2],
 579                th->initial_limits[0], th->initial_limits[1],
 580                th->initial_limits[2]);
 581
 582        for (i = 0; i < 3; i++)
 583                write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
 584
 585        write_both_fan_speed(th, -1);
 586
 587        kfree(th);
 588
 589        return 0;
 590}
 591
 592static const struct i2c_device_id therm_adt746x_id[] = {
 593        { "MAC,adt7460", ADT7460 },
 594        { "MAC,adt7467", ADT7467 },
 595        { }
 596};
 597MODULE_DEVICE_TABLE(i2c, therm_adt746x_id);
 598
 599static struct i2c_driver thermostat_driver = {
 600        .driver = {
 601                .name   = "therm_adt746x",
 602        },
 603        .probe = probe_thermostat,
 604        .remove = remove_thermostat,
 605        .id_table = therm_adt746x_id,
 606};
 607
 608static int __init thermostat_init(void)
 609{
 610#ifndef CONFIG_I2C_POWERMAC
 611        request_module("i2c-powermac");
 612#endif
 613
 614        return i2c_add_driver(&thermostat_driver);
 615}
 616
 617static void __exit thermostat_exit(void)
 618{
 619        i2c_del_driver(&thermostat_driver);
 620}
 621
 622module_init(thermostat_init);
 623module_exit(thermostat_exit);
 624
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