Root/drivers/char/i8k.c

1/*
2 * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
3 * See http://www.debian.org/~dz/i8k/ for more information
4 * and for latest version of this driver.
5 *
6 * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
7 *
8 * Hwmon integration:
9 * Copyright (C) 2011 Jean Delvare <khali@linux-fr.org>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2, or (at your option) any
14 * later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 */
21
22#include <linux/module.h>
23#include <linux/types.h>
24#include <linux/init.h>
25#include <linux/proc_fs.h>
26#include <linux/seq_file.h>
27#include <linux/dmi.h>
28#include <linux/capability.h>
29#include <linux/mutex.h>
30#include <linux/hwmon.h>
31#include <linux/hwmon-sysfs.h>
32#include <asm/uaccess.h>
33#include <asm/io.h>
34
35#include <linux/i8k.h>
36
37#define I8K_VERSION "1.14 21/02/2005"
38
39#define I8K_SMM_FN_STATUS 0x0025
40#define I8K_SMM_POWER_STATUS 0x0069
41#define I8K_SMM_SET_FAN 0x01a3
42#define I8K_SMM_GET_FAN 0x00a3
43#define I8K_SMM_GET_SPEED 0x02a3
44#define I8K_SMM_GET_TEMP 0x10a3
45#define I8K_SMM_GET_DELL_SIG1 0xfea3
46#define I8K_SMM_GET_DELL_SIG2 0xffa3
47#define I8K_SMM_BIOS_VERSION 0x00a6
48
49#define I8K_FAN_MULT 30
50#define I8K_MAX_TEMP 127
51
52#define I8K_FN_NONE 0x00
53#define I8K_FN_UP 0x01
54#define I8K_FN_DOWN 0x02
55#define I8K_FN_MUTE 0x04
56#define I8K_FN_MASK 0x07
57#define I8K_FN_SHIFT 8
58
59#define I8K_POWER_AC 0x05
60#define I8K_POWER_BATTERY 0x01
61
62#define I8K_TEMPERATURE_BUG 1
63
64static DEFINE_MUTEX(i8k_mutex);
65static char bios_version[4];
66static struct device *i8k_hwmon_dev;
67
68MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
69MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
70MODULE_LICENSE("GPL");
71
72static bool force;
73module_param(force, bool, 0);
74MODULE_PARM_DESC(force, "Force loading without checking for supported models");
75
76static bool ignore_dmi;
77module_param(ignore_dmi, bool, 0);
78MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
79
80static bool restricted;
81module_param(restricted, bool, 0);
82MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
83
84static bool power_status;
85module_param(power_status, bool, 0600);
86MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
87
88static int fan_mult = I8K_FAN_MULT;
89module_param(fan_mult, int, 0);
90MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
91
92static int i8k_open_fs(struct inode *inode, struct file *file);
93static long i8k_ioctl(struct file *, unsigned int, unsigned long);
94
95static const struct file_operations i8k_fops = {
96    .owner = THIS_MODULE,
97    .open = i8k_open_fs,
98    .read = seq_read,
99    .llseek = seq_lseek,
100    .release = single_release,
101    .unlocked_ioctl = i8k_ioctl,
102};
103
104struct smm_regs {
105    unsigned int eax;
106    unsigned int ebx __attribute__ ((packed));
107    unsigned int ecx __attribute__ ((packed));
108    unsigned int edx __attribute__ ((packed));
109    unsigned int esi __attribute__ ((packed));
110    unsigned int edi __attribute__ ((packed));
111};
112
113static inline const char *i8k_get_dmi_data(int field)
114{
115    const char *dmi_data = dmi_get_system_info(field);
116
117    return dmi_data && *dmi_data ? dmi_data : "?";
118}
119
120/*
121 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
122 */
123static int i8k_smm(struct smm_regs *regs)
124{
125    int rc;
126    int eax = regs->eax;
127
128#if defined(CONFIG_X86_64)
129    asm volatile("pushq %%rax\n\t"
130        "movl 0(%%rax),%%edx\n\t"
131        "pushq %%rdx\n\t"
132        "movl 4(%%rax),%%ebx\n\t"
133        "movl 8(%%rax),%%ecx\n\t"
134        "movl 12(%%rax),%%edx\n\t"
135        "movl 16(%%rax),%%esi\n\t"
136        "movl 20(%%rax),%%edi\n\t"
137        "popq %%rax\n\t"
138        "out %%al,$0xb2\n\t"
139        "out %%al,$0x84\n\t"
140        "xchgq %%rax,(%%rsp)\n\t"
141        "movl %%ebx,4(%%rax)\n\t"
142        "movl %%ecx,8(%%rax)\n\t"
143        "movl %%edx,12(%%rax)\n\t"
144        "movl %%esi,16(%%rax)\n\t"
145        "movl %%edi,20(%%rax)\n\t"
146        "popq %%rdx\n\t"
147        "movl %%edx,0(%%rax)\n\t"
148        "pushfq\n\t"
149        "popq %%rax\n\t"
150        "andl $1,%%eax\n"
151        :"=a"(rc)
152        : "a"(regs)
153        : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
154#else
155    asm volatile("pushl %%eax\n\t"
156        "movl 0(%%eax),%%edx\n\t"
157        "push %%edx\n\t"
158        "movl 4(%%eax),%%ebx\n\t"
159        "movl 8(%%eax),%%ecx\n\t"
160        "movl 12(%%eax),%%edx\n\t"
161        "movl 16(%%eax),%%esi\n\t"
162        "movl 20(%%eax),%%edi\n\t"
163        "popl %%eax\n\t"
164        "out %%al,$0xb2\n\t"
165        "out %%al,$0x84\n\t"
166        "xchgl %%eax,(%%esp)\n\t"
167        "movl %%ebx,4(%%eax)\n\t"
168        "movl %%ecx,8(%%eax)\n\t"
169        "movl %%edx,12(%%eax)\n\t"
170        "movl %%esi,16(%%eax)\n\t"
171        "movl %%edi,20(%%eax)\n\t"
172        "popl %%edx\n\t"
173        "movl %%edx,0(%%eax)\n\t"
174        "lahf\n\t"
175        "shrl $8,%%eax\n\t"
176        "andl $1,%%eax\n"
177        :"=a"(rc)
178        : "a"(regs)
179        : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
180#endif
181    if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
182        return -EINVAL;
183
184    return 0;
185}
186
187/*
188 * Read the bios version. Return the version as an integer corresponding
189 * to the ascii value, for example "A17" is returned as 0x00413137.
190 */
191static int i8k_get_bios_version(void)
192{
193    struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
194
195    return i8k_smm(&regs) ? : regs.eax;
196}
197
198/*
199 * Read the Fn key status.
200 */
201static int i8k_get_fn_status(void)
202{
203    struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
204    int rc;
205
206    if ((rc = i8k_smm(&regs)) < 0)
207        return rc;
208
209    switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
210    case I8K_FN_UP:
211        return I8K_VOL_UP;
212    case I8K_FN_DOWN:
213        return I8K_VOL_DOWN;
214    case I8K_FN_MUTE:
215        return I8K_VOL_MUTE;
216    default:
217        return 0;
218    }
219}
220
221/*
222 * Read the power status.
223 */
224static int i8k_get_power_status(void)
225{
226    struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
227    int rc;
228
229    if ((rc = i8k_smm(&regs)) < 0)
230        return rc;
231
232    return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
233}
234
235/*
236 * Read the fan status.
237 */
238static int i8k_get_fan_status(int fan)
239{
240    struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
241
242    regs.ebx = fan & 0xff;
243    return i8k_smm(&regs) ? : regs.eax & 0xff;
244}
245
246/*
247 * Read the fan speed in RPM.
248 */
249static int i8k_get_fan_speed(int fan)
250{
251    struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
252
253    regs.ebx = fan & 0xff;
254    return i8k_smm(&regs) ? : (regs.eax & 0xffff) * fan_mult;
255}
256
257/*
258 * Set the fan speed (off, low, high). Returns the new fan status.
259 */
260static int i8k_set_fan(int fan, int speed)
261{
262    struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
263
264    speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
265    regs.ebx = (fan & 0xff) | (speed << 8);
266
267    return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
268}
269
270/*
271 * Read the cpu temperature.
272 */
273static int i8k_get_temp(int sensor)
274{
275    struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
276    int rc;
277    int temp;
278
279#ifdef I8K_TEMPERATURE_BUG
280    static int prev;
281#endif
282    regs.ebx = sensor & 0xff;
283    if ((rc = i8k_smm(&regs)) < 0)
284        return rc;
285
286    temp = regs.eax & 0xff;
287
288#ifdef I8K_TEMPERATURE_BUG
289    /*
290     * Sometimes the temperature sensor returns 0x99, which is out of range.
291     * In this case we return (once) the previous cached value. For example:
292     # 1003655137 00000058 00005a4b
293     # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
294     # 1003655139 00000054 00005c52
295     */
296    if (temp > I8K_MAX_TEMP) {
297        temp = prev;
298        prev = I8K_MAX_TEMP;
299    } else {
300        prev = temp;
301    }
302#endif
303
304    return temp;
305}
306
307static int i8k_get_dell_signature(int req_fn)
308{
309    struct smm_regs regs = { .eax = req_fn, };
310    int rc;
311
312    if ((rc = i8k_smm(&regs)) < 0)
313        return rc;
314
315    return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
316}
317
318static int
319i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
320{
321    int val = 0;
322    int speed;
323    unsigned char buff[16];
324    int __user *argp = (int __user *)arg;
325
326    if (!argp)
327        return -EINVAL;
328
329    switch (cmd) {
330    case I8K_BIOS_VERSION:
331        val = i8k_get_bios_version();
332        break;
333
334    case I8K_MACHINE_ID:
335        memset(buff, 0, 16);
336        strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
337        break;
338
339    case I8K_FN_STATUS:
340        val = i8k_get_fn_status();
341        break;
342
343    case I8K_POWER_STATUS:
344        val = i8k_get_power_status();
345        break;
346
347    case I8K_GET_TEMP:
348        val = i8k_get_temp(0);
349        break;
350
351    case I8K_GET_SPEED:
352        if (copy_from_user(&val, argp, sizeof(int)))
353            return -EFAULT;
354
355        val = i8k_get_fan_speed(val);
356        break;
357
358    case I8K_GET_FAN:
359        if (copy_from_user(&val, argp, sizeof(int)))
360            return -EFAULT;
361
362        val = i8k_get_fan_status(val);
363        break;
364
365    case I8K_SET_FAN:
366        if (restricted && !capable(CAP_SYS_ADMIN))
367            return -EPERM;
368
369        if (copy_from_user(&val, argp, sizeof(int)))
370            return -EFAULT;
371
372        if (copy_from_user(&speed, argp + 1, sizeof(int)))
373            return -EFAULT;
374
375        val = i8k_set_fan(val, speed);
376        break;
377
378    default:
379        return -EINVAL;
380    }
381
382    if (val < 0)
383        return val;
384
385    switch (cmd) {
386    case I8K_BIOS_VERSION:
387        if (copy_to_user(argp, &val, 4))
388            return -EFAULT;
389
390        break;
391    case I8K_MACHINE_ID:
392        if (copy_to_user(argp, buff, 16))
393            return -EFAULT;
394
395        break;
396    default:
397        if (copy_to_user(argp, &val, sizeof(int)))
398            return -EFAULT;
399
400        break;
401    }
402
403    return 0;
404}
405
406static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
407{
408    long ret;
409
410    mutex_lock(&i8k_mutex);
411    ret = i8k_ioctl_unlocked(fp, cmd, arg);
412    mutex_unlock(&i8k_mutex);
413
414    return ret;
415}
416
417/*
418 * Print the information for /proc/i8k.
419 */
420static int i8k_proc_show(struct seq_file *seq, void *offset)
421{
422    int fn_key, cpu_temp, ac_power;
423    int left_fan, right_fan, left_speed, right_speed;
424
425    cpu_temp = i8k_get_temp(0); /* 11100 µs */
426    left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
427    right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
428    left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
429    right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
430    fn_key = i8k_get_fn_status(); /* 750 µs */
431    if (power_status)
432        ac_power = i8k_get_power_status(); /* 14700 µs */
433    else
434        ac_power = -1;
435
436    /*
437     * Info:
438     *
439     * 1) Format version (this will change if format changes)
440     * 2) BIOS version
441     * 3) BIOS machine ID
442     * 4) Cpu temperature
443     * 5) Left fan status
444     * 6) Right fan status
445     * 7) Left fan speed
446     * 8) Right fan speed
447     * 9) AC power
448     * 10) Fn Key status
449     */
450    return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
451              I8K_PROC_FMT,
452              bios_version,
453              i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
454              cpu_temp,
455              left_fan, right_fan, left_speed, right_speed,
456              ac_power, fn_key);
457}
458
459static int i8k_open_fs(struct inode *inode, struct file *file)
460{
461    return single_open(file, i8k_proc_show, NULL);
462}
463
464
465/*
466 * Hwmon interface
467 */
468
469static ssize_t i8k_hwmon_show_temp(struct device *dev,
470                   struct device_attribute *devattr,
471                   char *buf)
472{
473    int cpu_temp;
474
475    cpu_temp = i8k_get_temp(0);
476    if (cpu_temp < 0)
477        return cpu_temp;
478    return sprintf(buf, "%d\n", cpu_temp * 1000);
479}
480
481static ssize_t i8k_hwmon_show_fan(struct device *dev,
482                  struct device_attribute *devattr,
483                  char *buf)
484{
485    int index = to_sensor_dev_attr(devattr)->index;
486    int fan_speed;
487
488    fan_speed = i8k_get_fan_speed(index);
489    if (fan_speed < 0)
490        return fan_speed;
491    return sprintf(buf, "%d\n", fan_speed);
492}
493
494static ssize_t i8k_hwmon_show_label(struct device *dev,
495                    struct device_attribute *devattr,
496                    char *buf)
497{
498    static const char *labels[4] = {
499        "i8k",
500        "CPU",
501        "Left Fan",
502        "Right Fan",
503    };
504    int index = to_sensor_dev_attr(devattr)->index;
505
506    return sprintf(buf, "%s\n", labels[index]);
507}
508
509static DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL);
510static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
511              I8K_FAN_LEFT);
512static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
513              I8K_FAN_RIGHT);
514static SENSOR_DEVICE_ATTR(name, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
515static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
516static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 2);
517static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 3);
518
519static void i8k_hwmon_remove_files(struct device *dev)
520{
521    device_remove_file(dev, &dev_attr_temp1_input);
522    device_remove_file(dev, &sensor_dev_attr_fan1_input.dev_attr);
523    device_remove_file(dev, &sensor_dev_attr_fan2_input.dev_attr);
524    device_remove_file(dev, &sensor_dev_attr_temp1_label.dev_attr);
525    device_remove_file(dev, &sensor_dev_attr_fan1_label.dev_attr);
526    device_remove_file(dev, &sensor_dev_attr_fan2_label.dev_attr);
527    device_remove_file(dev, &sensor_dev_attr_name.dev_attr);
528}
529
530static int __init i8k_init_hwmon(void)
531{
532    int err;
533
534    i8k_hwmon_dev = hwmon_device_register(NULL);
535    if (IS_ERR(i8k_hwmon_dev)) {
536        err = PTR_ERR(i8k_hwmon_dev);
537        i8k_hwmon_dev = NULL;
538        printk(KERN_ERR "i8k: hwmon registration failed (%d)\n", err);
539        return err;
540    }
541
542    /* Required name attribute */
543    err = device_create_file(i8k_hwmon_dev,
544                 &sensor_dev_attr_name.dev_attr);
545    if (err)
546        goto exit_unregister;
547
548    /* CPU temperature attributes, if temperature reading is OK */
549    err = i8k_get_temp(0);
550    if (err < 0) {
551        dev_dbg(i8k_hwmon_dev,
552            "Not creating temperature attributes (%d)\n", err);
553    } else {
554        err = device_create_file(i8k_hwmon_dev, &dev_attr_temp1_input);
555        if (err)
556            goto exit_remove_files;
557        err = device_create_file(i8k_hwmon_dev,
558                     &sensor_dev_attr_temp1_label.dev_attr);
559        if (err)
560            goto exit_remove_files;
561    }
562
563    /* Left fan attributes, if left fan is present */
564    err = i8k_get_fan_status(I8K_FAN_LEFT);
565    if (err < 0) {
566        dev_dbg(i8k_hwmon_dev,
567            "Not creating %s fan attributes (%d)\n", "left", err);
568    } else {
569        err = device_create_file(i8k_hwmon_dev,
570                     &sensor_dev_attr_fan1_input.dev_attr);
571        if (err)
572            goto exit_remove_files;
573        err = device_create_file(i8k_hwmon_dev,
574                     &sensor_dev_attr_fan1_label.dev_attr);
575        if (err)
576            goto exit_remove_files;
577    }
578
579    /* Right fan attributes, if right fan is present */
580    err = i8k_get_fan_status(I8K_FAN_RIGHT);
581    if (err < 0) {
582        dev_dbg(i8k_hwmon_dev,
583            "Not creating %s fan attributes (%d)\n", "right", err);
584    } else {
585        err = device_create_file(i8k_hwmon_dev,
586                     &sensor_dev_attr_fan2_input.dev_attr);
587        if (err)
588            goto exit_remove_files;
589        err = device_create_file(i8k_hwmon_dev,
590                     &sensor_dev_attr_fan2_label.dev_attr);
591        if (err)
592            goto exit_remove_files;
593    }
594
595    return 0;
596
597 exit_remove_files:
598    i8k_hwmon_remove_files(i8k_hwmon_dev);
599 exit_unregister:
600    hwmon_device_unregister(i8k_hwmon_dev);
601    return err;
602}
603
604static void __exit i8k_exit_hwmon(void)
605{
606    i8k_hwmon_remove_files(i8k_hwmon_dev);
607    hwmon_device_unregister(i8k_hwmon_dev);
608}
609
610static struct dmi_system_id __initdata i8k_dmi_table[] = {
611    {
612        .ident = "Dell Inspiron",
613        .matches = {
614            DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
615            DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
616        },
617    },
618    {
619        .ident = "Dell Latitude",
620        .matches = {
621            DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
622            DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
623        },
624    },
625    {
626        .ident = "Dell Inspiron 2",
627        .matches = {
628            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
629            DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
630        },
631    },
632    {
633        .ident = "Dell Latitude 2",
634        .matches = {
635            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
636            DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
637        },
638    },
639    { /* UK Inspiron 6400 */
640        .ident = "Dell Inspiron 3",
641        .matches = {
642            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
643            DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
644        },
645    },
646    {
647        .ident = "Dell Inspiron 3",
648        .matches = {
649            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
650            DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
651        },
652    },
653    {
654        .ident = "Dell Precision",
655        .matches = {
656            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
657            DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
658        },
659    },
660    {
661        .ident = "Dell Vostro",
662        .matches = {
663            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
664            DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
665        },
666    },
667        { }
668};
669
670/*
671 * Probe for the presence of a supported laptop.
672 */
673static int __init i8k_probe(void)
674{
675    char buff[4];
676    int version;
677
678    /*
679     * Get DMI information
680     */
681    if (!dmi_check_system(i8k_dmi_table)) {
682        if (!ignore_dmi && !force)
683            return -ENODEV;
684
685        printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
686        printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
687            i8k_get_dmi_data(DMI_SYS_VENDOR),
688            i8k_get_dmi_data(DMI_PRODUCT_NAME),
689            i8k_get_dmi_data(DMI_BIOS_VERSION));
690    }
691
692    strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));
693
694    /*
695     * Get SMM Dell signature
696     */
697    if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
698        i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
699        printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
700        if (!force)
701            return -ENODEV;
702    }
703
704    /*
705     * Get SMM BIOS version.
706     */
707    version = i8k_get_bios_version();
708    if (version <= 0) {
709        printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
710    } else {
711        buff[0] = (version >> 16) & 0xff;
712        buff[1] = (version >> 8) & 0xff;
713        buff[2] = (version) & 0xff;
714        buff[3] = '\0';
715        /*
716         * If DMI BIOS version is unknown use SMM BIOS version.
717         */
718        if (!dmi_get_system_info(DMI_BIOS_VERSION))
719            strlcpy(bios_version, buff, sizeof(bios_version));
720
721        /*
722         * Check if the two versions match.
723         */
724        if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
725            printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
726                buff, bios_version);
727    }
728
729    return 0;
730}
731
732static int __init i8k_init(void)
733{
734    struct proc_dir_entry *proc_i8k;
735    int err;
736
737    /* Are we running on an supported laptop? */
738    if (i8k_probe())
739        return -ENODEV;
740
741    /* Register the proc entry */
742    proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
743    if (!proc_i8k)
744        return -ENOENT;
745
746    err = i8k_init_hwmon();
747    if (err)
748        goto exit_remove_proc;
749
750    printk(KERN_INFO
751           "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
752           I8K_VERSION);
753
754    return 0;
755
756 exit_remove_proc:
757    remove_proc_entry("i8k", NULL);
758    return err;
759}
760
761static void __exit i8k_exit(void)
762{
763    i8k_exit_hwmon();
764    remove_proc_entry("i8k", NULL);
765}
766
767module_init(i8k_init);
768module_exit(i8k_exit);
769

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