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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [i8k.c] - Blame information for rev 62

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/*
 * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
 *          See http://www.debian.org/~dz/i8k/ for more information
 *          and for latest version of this driver.
 *
 * Copyright (C) 2001  Massimo Dal Zotto <dz@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
 
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/dmi.h>
#include <linux/capability.h>
#include <asm/uaccess.h>
#include <asm/io.h>
 
#include <linux/i8k.h>
 
#define I8K_VERSION             "1.14 21/02/2005"
 
#define I8K_SMM_FN_STATUS       0x0025
#define I8K_SMM_POWER_STATUS    0x0069
#define I8K_SMM_SET_FAN         0x01a3
#define I8K_SMM_GET_FAN         0x00a3
#define I8K_SMM_GET_SPEED       0x02a3
#define I8K_SMM_GET_TEMP        0x10a3
#define I8K_SMM_GET_DELL_SIG1   0xfea3
#define I8K_SMM_GET_DELL_SIG2   0xffa3
#define I8K_SMM_BIOS_VERSION    0x00a6
 
#define I8K_FAN_MULT            30
#define I8K_MAX_TEMP            127
 
#define I8K_FN_NONE             0x00
#define I8K_FN_UP               0x01
#define I8K_FN_DOWN             0x02
#define I8K_FN_MUTE             0x04
#define I8K_FN_MASK             0x07
#define I8K_FN_SHIFT            8
 
#define I8K_POWER_AC            0x05
#define I8K_POWER_BATTERY       0x01
 
#define I8K_TEMPERATURE_BUG     1
 
static char bios_version[4];
 
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
MODULE_LICENSE("GPL");
 
static int force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");
 
static int ignore_dmi;
module_param(ignore_dmi, bool, 0);
MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
 
static int restricted;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
 
static int power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
 
static int i8k_open_fs(struct inode *inode, struct file *file);
static int i8k_ioctl(struct inode *, struct file *, unsigned int,
                     unsigned long);
 
static const struct file_operations i8k_fops = {
        .open           = i8k_open_fs,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .ioctl          = i8k_ioctl,
};
 
struct smm_regs {
        unsigned int eax;
        unsigned int ebx __attribute__ ((packed));
        unsigned int ecx __attribute__ ((packed));
        unsigned int edx __attribute__ ((packed));
        unsigned int esi __attribute__ ((packed));
        unsigned int edi __attribute__ ((packed));
};
 
static inline const char *i8k_get_dmi_data(int field)
{
        const char *dmi_data = dmi_get_system_info(field);
 
        return dmi_data && *dmi_data ? dmi_data : "?";
}
 
/*
 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
 */
static int i8k_smm(struct smm_regs *regs)
{
        int rc;
        int eax = regs->eax;
 
        asm("pushl %%eax\n\t"
            "movl 0(%%eax),%%edx\n\t"
            "push %%edx\n\t"
            "movl 4(%%eax),%%ebx\n\t"
            "movl 8(%%eax),%%ecx\n\t"
            "movl 12(%%eax),%%edx\n\t"
            "movl 16(%%eax),%%esi\n\t"
            "movl 20(%%eax),%%edi\n\t"
            "popl %%eax\n\t"
            "out %%al,$0xb2\n\t"
            "out %%al,$0x84\n\t"
            "xchgl %%eax,(%%esp)\n\t"
            "movl %%ebx,4(%%eax)\n\t"
            "movl %%ecx,8(%%eax)\n\t"
            "movl %%edx,12(%%eax)\n\t"
            "movl %%esi,16(%%eax)\n\t"
            "movl %%edi,20(%%eax)\n\t"
            "popl %%edx\n\t"
            "movl %%edx,0(%%eax)\n\t"
            "lahf\n\t"
            "shrl $8,%%eax\n\t"
            "andl $1,%%eax\n":"=a"(rc)
            :    "a"(regs)
            :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 
        if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
                return -EINVAL;
 
        return 0;
}
 
/*
 * Read the bios version. Return the version as an integer corresponding
 * to the ascii value, for example "A17" is returned as 0x00413137.
 */
static int i8k_get_bios_version(void)
{
        struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
 
        return i8k_smm(&regs) ? : regs.eax;
}
 
/*
 * Read the Fn key status.
 */
static int i8k_get_fn_status(void)
{
        struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
        int rc;
 
        if ((rc = i8k_smm(&regs)) < 0)
                return rc;
 
        switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
        case I8K_FN_UP:
                return I8K_VOL_UP;
        case I8K_FN_DOWN:
                return I8K_VOL_DOWN;
        case I8K_FN_MUTE:
                return I8K_VOL_MUTE;
        default:
                return 0;
        }
}
 
/*
 * Read the power status.
 */
static int i8k_get_power_status(void)
{
        struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
        int rc;
 
        if ((rc = i8k_smm(&regs)) < 0)
                return rc;
 
        return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
}
 
/*
 * Read the fan status.
 */
static int i8k_get_fan_status(int fan)
{
        struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
 
        regs.ebx = fan & 0xff;
        return i8k_smm(&regs) ? : regs.eax & 0xff;
}
 
/*
 * Read the fan speed in RPM.
 */
static int i8k_get_fan_speed(int fan)
{
        struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
 
        regs.ebx = fan & 0xff;
        return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
}
 
/*
 * Set the fan speed (off, low, high). Returns the new fan status.
 */
static int i8k_set_fan(int fan, int speed)
{
        struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
 
        speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
        regs.ebx = (fan & 0xff) | (speed << 8);
 
        return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
}
 
/*
 * Read the cpu temperature.
 */
static int i8k_get_temp(int sensor)
{
        struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
        int rc;
        int temp;
 
#ifdef I8K_TEMPERATURE_BUG
        static int prev;
#endif
        regs.ebx = sensor & 0xff;
        if ((rc = i8k_smm(&regs)) < 0)
                return rc;
 
        temp = regs.eax & 0xff;
 
#ifdef I8K_TEMPERATURE_BUG
        /*
         * Sometimes the temperature sensor returns 0x99, which is out of range.
         * In this case we return (once) the previous cached value. For example:
         # 1003655137 00000058 00005a4b
         # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
         # 1003655139 00000054 00005c52
         */
        if (temp > I8K_MAX_TEMP) {
                temp = prev;
                prev = I8K_MAX_TEMP;
        } else {
                prev = temp;
        }
#endif
 
        return temp;
}
 
static int i8k_get_dell_signature(int req_fn)
{
        struct smm_regs regs = { .eax = req_fn, };
        int rc;
 
        if ((rc = i8k_smm(&regs)) < 0)
                return rc;
 
        return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
}
 
static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
                     unsigned long arg)
{
        int val = 0;
        int speed;
        unsigned char buff[16];
        int __user *argp = (int __user *)arg;
 
        if (!argp)
                return -EINVAL;
 
        switch (cmd) {
        case I8K_BIOS_VERSION:
                val = i8k_get_bios_version();
                break;
 
        case I8K_MACHINE_ID:
                memset(buff, 0, 16);
                strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
                break;
 
        case I8K_FN_STATUS:
                val = i8k_get_fn_status();
                break;
 
        case I8K_POWER_STATUS:
                val = i8k_get_power_status();
                break;
 
        case I8K_GET_TEMP:
                val = i8k_get_temp(0);
                break;
 
        case I8K_GET_SPEED:
                if (copy_from_user(&val, argp, sizeof(int)))
                        return -EFAULT;
 
                val = i8k_get_fan_speed(val);
                break;
 
        case I8K_GET_FAN:
                if (copy_from_user(&val, argp, sizeof(int)))
                        return -EFAULT;
 
                val = i8k_get_fan_status(val);
                break;
 
        case I8K_SET_FAN:
                if (restricted && !capable(CAP_SYS_ADMIN))
                        return -EPERM;
 
                if (copy_from_user(&val, argp, sizeof(int)))
                        return -EFAULT;
 
                if (copy_from_user(&speed, argp + 1, sizeof(int)))
                        return -EFAULT;
 
                val = i8k_set_fan(val, speed);
                break;
 
        default:
                return -EINVAL;
        }
 
        if (val < 0)
                return val;
 
        switch (cmd) {
        case I8K_BIOS_VERSION:
                if (copy_to_user(argp, &val, 4))
                        return -EFAULT;
 
                break;
        case I8K_MACHINE_ID:
                if (copy_to_user(argp, buff, 16))
                        return -EFAULT;
 
                break;
        default:
                if (copy_to_user(argp, &val, sizeof(int)))
                        return -EFAULT;
 
                break;
        }
 
        return 0;
}
 
/*
 * Print the information for /proc/i8k.
 */
static int i8k_proc_show(struct seq_file *seq, void *offset)
{
        int fn_key, cpu_temp, ac_power;
        int left_fan, right_fan, left_speed, right_speed;
 
        cpu_temp        = i8k_get_temp(0);                       /* 11100 µs */
        left_fan        = i8k_get_fan_status(I8K_FAN_LEFT);     /*   580 µs */
        right_fan       = i8k_get_fan_status(I8K_FAN_RIGHT);    /*   580 µs */
        left_speed      = i8k_get_fan_speed(I8K_FAN_LEFT);      /*   580 µs */
        right_speed     = i8k_get_fan_speed(I8K_FAN_RIGHT);     /*   580 µs */
        fn_key          = i8k_get_fn_status();                  /*   750 µs */
        if (power_status)
                ac_power = i8k_get_power_status();              /* 14700 µs */
        else
                ac_power = -1;
 
        /*
         * Info:
         *
         * 1)  Format version (this will change if format changes)
         * 2)  BIOS version
         * 3)  BIOS machine ID
         * 4)  Cpu temperature
         * 5)  Left fan status
         * 6)  Right fan status
         * 7)  Left fan speed
         * 8)  Right fan speed
         * 9)  AC power
         * 10) Fn Key status
         */
        return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
                          I8K_PROC_FMT,
                          bios_version,
                          i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
                          cpu_temp,
                          left_fan, right_fan, left_speed, right_speed,
                          ac_power, fn_key);
}
 
static int i8k_open_fs(struct inode *inode, struct file *file)
{
        return single_open(file, i8k_proc_show, NULL);
}
 
static struct dmi_system_id __initdata i8k_dmi_table[] = {
        {
                .ident = "Dell Inspiron",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
                },
        },
        {
                .ident = "Dell Latitude",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
                },
        },
        {
                .ident = "Dell Inspiron 2",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
                },
        },
        {
                .ident = "Dell Latitude 2",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
                },
        },
        { }
};
 
/*
 * Probe for the presence of a supported laptop.
 */
static int __init i8k_probe(void)
{
        char buff[4];
        int version;
 
        /*
         * Get DMI information
         */
        if (!dmi_check_system(i8k_dmi_table)) {
                if (!ignore_dmi && !force)
                        return -ENODEV;
 
                printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
                printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
                        i8k_get_dmi_data(DMI_SYS_VENDOR),
                        i8k_get_dmi_data(DMI_PRODUCT_NAME),
                        i8k_get_dmi_data(DMI_BIOS_VERSION));
        }
 
        strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));
 
        /*
         * Get SMM Dell signature
         */
        if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
            i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
                printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
                if (!force)
                        return -ENODEV;
        }
 
        /*
         * Get SMM BIOS version.
         */
        version = i8k_get_bios_version();
        if (version <= 0) {
                printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
        } else {
                buff[0] = (version >> 16) & 0xff;
                buff[1] = (version >> 8) & 0xff;
                buff[2] = (version) & 0xff;
                buff[3] = '\0';
                /*
                 * If DMI BIOS version is unknown use SMM BIOS version.
                 */
                if (!dmi_get_system_info(DMI_BIOS_VERSION))
                        strlcpy(bios_version, buff, sizeof(bios_version));
 
                /*
                 * Check if the two versions match.
                 */
                if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
                        printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
                                buff, bios_version);
        }
 
        return 0;
}
 
static int __init i8k_init(void)
{
        struct proc_dir_entry *proc_i8k;
 
        /* Are we running on an supported laptop? */
        if (i8k_probe())
                return -ENODEV;
 
        /* Register the proc entry */
        proc_i8k = create_proc_entry("i8k", 0, NULL);
        if (!proc_i8k)
                return -ENOENT;
 
        proc_i8k->proc_fops = &i8k_fops;
        proc_i8k->owner = THIS_MODULE;
 
        printk(KERN_INFO
               "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
               I8K_VERSION);
 
        return 0;
}
 
static void __exit i8k_exit(void)
{
        remove_proc_entry("i8k", NULL);
}
 
module_init(i8k_init);
module_exit(i8k_exit);

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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [i8k.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
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			`* This program is free software; you can redistribute it and/or modify it`
9			`* under the terms of the GNU General Public License as published by the`
10			`* Free Software Foundation; either version 2, or (at your option) any`
11			`* later version.`
12			`*`
13			`* This program is distributed in the hope that it will be useful, but`
14			`* WITHOUT ANY WARRANTY; without even the implied warranty of`
15			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
16			`* General Public License for more details.`
17			`*/`
18
19			`#include <linux/module.h>`
20			`#include <linux/types.h>`
21			`#include <linux/init.h>`
22			`#include <linux/proc_fs.h>`
23			`#include <linux/seq_file.h>`
24			`#include <linux/dmi.h>`
25			`#include <linux/capability.h>`
26			`#include <asm/uaccess.h>`
27			`#include <asm/io.h>`
28
29			`#include <linux/i8k.h>`
30
31			`#define I8K_VERSION "1.14 21/02/2005"`
32
33			`#define I8K_SMM_FN_STATUS 0x0025`
34			`#define I8K_SMM_POWER_STATUS 0x0069`
35			`#define I8K_SMM_SET_FAN 0x01a3`
36			`#define I8K_SMM_GET_FAN 0x00a3`
37			`#define I8K_SMM_GET_SPEED 0x02a3`
38			`#define I8K_SMM_GET_TEMP 0x10a3`
39			`#define I8K_SMM_GET_DELL_SIG1 0xfea3`
40			`#define I8K_SMM_GET_DELL_SIG2 0xffa3`
41			`#define I8K_SMM_BIOS_VERSION 0x00a6`
42
43			`#define I8K_FAN_MULT 30`
44			`#define I8K_MAX_TEMP 127`
45
46			`#define I8K_FN_NONE 0x00`
47			`#define I8K_FN_UP 0x01`
48			`#define I8K_FN_DOWN 0x02`
49			`#define I8K_FN_MUTE 0x04`
50			`#define I8K_FN_MASK 0x07`
51			`#define I8K_FN_SHIFT 8`
52
53			`#define I8K_POWER_AC 0x05`
54			`#define I8K_POWER_BATTERY 0x01`
55
56			`#define I8K_TEMPERATURE_BUG 1`
57
58			`static char bios_version[4];`
59
60			`MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");`
61			`MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");`
62			`MODULE_LICENSE("GPL");`
63
64			`static int force;`
65			`module_param(force, bool, 0);`
66			`MODULE_PARM_DESC(force, "Force loading without checking for supported models");`
67
68			`static int ignore_dmi;`
69			`module_param(ignore_dmi, bool, 0);`
70			`MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");`
71
72			`static int restricted;`
73			`module_param(restricted, bool, 0);`
74			`MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");`
75
76			`static int power_status;`
77			`module_param(power_status, bool, 0600);`
78			`MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");`
79
80			`static int i8k_open_fs(struct inode inode, struct file file);`
81			`static int i8k_ioctl(struct inode , struct file , unsigned int,`
82			`unsigned long);`
83
84			`static const struct file_operations i8k_fops = {`
85			`.open = i8k_open_fs,`
86			`.read = seq_read,`
87			`.llseek = seq_lseek,`
88			`.release = single_release,`
89			`.ioctl = i8k_ioctl,`
90			`};`
91
92			`struct smm_regs {`
93			`unsigned int eax;`
94			`unsigned int ebx __attribute__ ((packed));`
95			`unsigned int ecx __attribute__ ((packed));`
96			`unsigned int edx __attribute__ ((packed));`
97			`unsigned int esi __attribute__ ((packed));`
98			`unsigned int edi __attribute__ ((packed));`
99			`};`
100
101			`static inline const char *i8k_get_dmi_data(int field)`
102			`{`
103			`const char *dmi_data = dmi_get_system_info(field);`
104
105			`return dmi_data && *dmi_data ? dmi_data : "?";`
106			`}`
107
108			`/*`
109			`* Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.`
110			`*/`
111			`static int i8k_smm(struct smm_regs *regs)`
112			`{`
113			`int rc;`
114			`int eax = regs->eax;`
115
116			`asm("pushl %%eax\n\t"`
117			`"movl 0(%%eax),%%edx\n\t"`
118			`"push %%edx\n\t"`
119			`"movl 4(%%eax),%%ebx\n\t"`
120			`"movl 8(%%eax),%%ecx\n\t"`
121			`"movl 12(%%eax),%%edx\n\t"`
122			`"movl 16(%%eax),%%esi\n\t"`
123			`"movl 20(%%eax),%%edi\n\t"`
124			`"popl %%eax\n\t"`
125			`"out %%al,$0xb2\n\t"`
126			`"out %%al,$0x84\n\t"`
127			`"xchgl %%eax,(%%esp)\n\t"`
128			`"movl %%ebx,4(%%eax)\n\t"`
129			`"movl %%ecx,8(%%eax)\n\t"`
130			`"movl %%edx,12(%%eax)\n\t"`
131			`"movl %%esi,16(%%eax)\n\t"`
132			`"movl %%edi,20(%%eax)\n\t"`
133			`"popl %%edx\n\t"`
134			`"movl %%edx,0(%%eax)\n\t"`
135			`"lahf\n\t"`
136			`"shrl $8,%%eax\n\t"`
137			`"andl $1,%%eax\n":"=a"(rc)`
138			`: "a"(regs)`
139			`: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");`
140
141			`if (rc != 0 \|\| (regs->eax & 0xffff) == 0xffff \|\| regs->eax == eax)`
142			`return -EINVAL;`
143
144			`return 0;`
145			`}`
146
147			`/*`
148			`* Read the bios version. Return the version as an integer corresponding`
149			`* to the ascii value, for example "A17" is returned as 0x00413137.`
150			`*/`
151			`static int i8k_get_bios_version(void)`
152			`{`
153			`struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };`
154
155			`return i8k_smm(&regs) ? : regs.eax;`
156			`}`
157
158			`/*`
159			`* Read the Fn key status.`
160			`*/`
161			`static int i8k_get_fn_status(void)`
162			`{`
163			`struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };`
164			`int rc;`
165
166			`if ((rc = i8k_smm(&regs)) < 0)`
167			`return rc;`
168
169			`switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {`
170			`case I8K_FN_UP:`
171			`return I8K_VOL_UP;`
172			`case I8K_FN_DOWN:`
173			`return I8K_VOL_DOWN;`
174			`case I8K_FN_MUTE:`
175			`return I8K_VOL_MUTE;`
176			`default:`
177			`return 0;`
178			`}`
179			`}`
180
181			`/*`
182			`* Read the power status.`
183			`*/`
184			`static int i8k_get_power_status(void)`
185			`{`
186			`struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };`
187			`int rc;`
188
189			`if ((rc = i8k_smm(&regs)) < 0)`
190			`return rc;`
191
192			`return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;`
193			`}`
194
195			`/*`
196			`* Read the fan status.`
197			`*/`
198			`static int i8k_get_fan_status(int fan)`
199			`{`
200			`struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };`
201
202			`regs.ebx = fan & 0xff;`
203			`return i8k_smm(&regs) ? : regs.eax & 0xff;`
204			`}`
205
206			`/*`
207			`* Read the fan speed in RPM.`
208			`*/`
209			`static int i8k_get_fan_speed(int fan)`
210			`{`
211			`struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };`
212
213			`regs.ebx = fan & 0xff;`
214			`return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;`
215			`}`
216
217			`/*`
218			`* Set the fan speed (off, low, high). Returns the new fan status.`
219			`*/`
220			`static int i8k_set_fan(int fan, int speed)`
221			`{`
222			`struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };`
223
224			`speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);`
225			`regs.ebx = (fan & 0xff) \| (speed << 8);`
226
227			`return i8k_smm(&regs) ? : i8k_get_fan_status(fan);`
228			`}`
229
230			`/*`
231			`* Read the cpu temperature.`
232			`*/`
233			`static int i8k_get_temp(int sensor)`
234			`{`
235			`struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };`
236			`int rc;`
237			`int temp;`
238
239			`#ifdef I8K_TEMPERATURE_BUG`
240			`static int prev;`
241			`#endif`
242			`regs.ebx = sensor & 0xff;`
243			`if ((rc = i8k_smm(&regs)) < 0)`
244			`return rc;`
245
246			`temp = regs.eax & 0xff;`
247
248			`#ifdef I8K_TEMPERATURE_BUG`
249			`/*`
250			`* Sometimes the temperature sensor returns 0x99, which is out of range.`
251			`* In this case we return (once) the previous cached value. For example:`
252			`# 1003655137 00000058 00005a4b`
253			`# 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees`
254			`# 1003655139 00000054 00005c52`
255			`*/`
256			`if (temp > I8K_MAX_TEMP) {`
257			`temp = prev;`
258			`prev = I8K_MAX_TEMP;`
259			`} else {`
260			`prev = temp;`
261			`}`
262			`#endif`
263
264			`return temp;`
265			`}`
266
267			`static int i8k_get_dell_signature(int req_fn)`
268			`{`
269			`struct smm_regs regs = { .eax = req_fn, };`
270			`int rc;`
271
272			`if ((rc = i8k_smm(&regs)) < 0)`
273			`return rc;`
274
275			`return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;`
276			`}`
277
278			`static int i8k_ioctl(struct inode ip, struct file fp, unsigned int cmd,`
279			`unsigned long arg)`
280			`{`
281			`int val = 0;`
282			`int speed;`
283			`unsigned char buff[16];`
284			`int __user argp = (int __user )arg;`
285
286			`if (!argp)`
287			`return -EINVAL;`
288
289			`switch (cmd) {`
290			`case I8K_BIOS_VERSION:`
291			`val = i8k_get_bios_version();`
292			`break;`
293
294			`case I8K_MACHINE_ID:`
295			`memset(buff, 0, 16);`
296			`strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));`
297			`break;`
298
299			`case I8K_FN_STATUS:`
300			`val = i8k_get_fn_status();`
301			`break;`
302
303			`case I8K_POWER_STATUS:`
304			`val = i8k_get_power_status();`
305			`break;`
306
307			`case I8K_GET_TEMP:`
308			`val = i8k_get_temp(0);`
309			`break;`
310
311			`case I8K_GET_SPEED:`
312			`if (copy_from_user(&val, argp, sizeof(int)))`
313			`return -EFAULT;`
314
315			`val = i8k_get_fan_speed(val);`
316			`break;`
317
318			`case I8K_GET_FAN:`
319			`if (copy_from_user(&val, argp, sizeof(int)))`
320			`return -EFAULT;`
321
322			`val = i8k_get_fan_status(val);`
323			`break;`
324
325			`case I8K_SET_FAN:`
326			`if (restricted && !capable(CAP_SYS_ADMIN))`
327			`return -EPERM;`
328
329			`if (copy_from_user(&val, argp, sizeof(int)))`
330			`return -EFAULT;`
331
332			`if (copy_from_user(&speed, argp + 1, sizeof(int)))`
333			`return -EFAULT;`
334
335			`val = i8k_set_fan(val, speed);`
336			`break;`
337
338			`default:`
339			`return -EINVAL;`
340			`}`
341
342			`if (val < 0)`
343			`return val;`
344
345			`switch (cmd) {`
346			`case I8K_BIOS_VERSION:`
347			`if (copy_to_user(argp, &val, 4))`
348			`return -EFAULT;`
349
350			`break;`
351			`case I8K_MACHINE_ID:`
352			`if (copy_to_user(argp, buff, 16))`
353			`return -EFAULT;`
354
355			`break;`
356			`default:`
357			`if (copy_to_user(argp, &val, sizeof(int)))`
358			`return -EFAULT;`
359
360			`break;`
361			`}`
362
363			`return 0;`
364			`}`
365
366			`/*`
367			`* Print the information for /proc/i8k.`
368			`*/`
369			`static int i8k_proc_show(struct seq_file seq, void offset)`
370			`{`
371			`int fn_key, cpu_temp, ac_power;`
372			`int left_fan, right_fan, left_speed, right_speed;`
373
374			`cpu_temp = i8k_get_temp(0); /* 11100 µs */`
375			`left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */`
376			`right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */`
377			`left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */`
378			`right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */`
379			`fn_key = i8k_get_fn_status(); /* 750 µs */`
380			`if (power_status)`
381			`ac_power = i8k_get_power_status(); /* 14700 µs */`
382			`else`
383			`ac_power = -1;`
384
385			`/*`
386			`* Info:`
387			`*`
388			`* 1) Format version (this will change if format changes)`
389			`* 2) BIOS version`
390			`* 3) BIOS machine ID`
391			`* 4) Cpu temperature`
392			`* 5) Left fan status`
393			`* 6) Right fan status`
394			`* 7) Left fan speed`
395			`* 8) Right fan speed`
396			`* 9) AC power`
397			`* 10) Fn Key status`
398			`*/`
399			`return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",`
400			`I8K_PROC_FMT,`
401			`bios_version,`
402			`i8k_get_dmi_data(DMI_PRODUCT_SERIAL),`
403			`cpu_temp,`
404			`left_fan, right_fan, left_speed, right_speed,`
405			`ac_power, fn_key);`
406			`}`
407
408			`static int i8k_open_fs(struct inode inode, struct file file)`
409			`{`
410			`return single_open(file, i8k_proc_show, NULL);`
411			`}`
412
413			`static struct dmi_system_id __initdata i8k_dmi_table[] = {`
414			`{`
415			`.ident = "Dell Inspiron",`
416			`.matches = {`
417			`DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),`
418			`DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),`
419			`},`
420			`},`
421			`{`
422			`.ident = "Dell Latitude",`
423			`.matches = {`
424			`DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),`
425			`DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),`
426			`},`
427			`},`
428			`{`
429			`.ident = "Dell Inspiron 2",`
430			`.matches = {`
431			`DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),`
432			`DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),`
433			`},`
434			`},`
435			`{`
436			`.ident = "Dell Latitude 2",`
437			`.matches = {`
438			`DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),`
439			`DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),`
440			`},`
441			`},`
442			`{ }`
443			`};`
444
445			`/*`
446			`* Probe for the presence of a supported laptop.`
447			`*/`
448			`static int __init i8k_probe(void)`
449			`{`
450			`char buff[4];`
451			`int version;`
452
453			`/*`
454			`* Get DMI information`
455			`*/`
456			`if (!dmi_check_system(i8k_dmi_table)) {`
457			`if (!ignore_dmi && !force)`
458			`return -ENODEV;`
459
460			`printk(KERN_INFO "i8k: not running on a supported Dell system.\n");`
461			`printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",`
462			`i8k_get_dmi_data(DMI_SYS_VENDOR),`
463			`i8k_get_dmi_data(DMI_PRODUCT_NAME),`
464			`i8k_get_dmi_data(DMI_BIOS_VERSION));`
465			`}`
466
467			`strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));`
468
469			`/*`
470			`* Get SMM Dell signature`
471			`*/`
472			`if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&`
473			`i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {`
474			`printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");`
475			`if (!force)`
476			`return -ENODEV;`
477			`}`
478
479			`/*`
480			`* Get SMM BIOS version.`
481			`*/`
482			`version = i8k_get_bios_version();`
483			`if (version <= 0) {`
484			`printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");`
485			`} else {`
486			`buff[0] = (version >> 16) & 0xff;`
487			`buff[1] = (version >> 8) & 0xff;`
488			`buff[2] = (version) & 0xff;`
489			`buff[3] = '\0';`
490			`/*`
491			`* If DMI BIOS version is unknown use SMM BIOS version.`
492			`*/`
493			`if (!dmi_get_system_info(DMI_BIOS_VERSION))`
494			`strlcpy(bios_version, buff, sizeof(bios_version));`
495
496			`/*`
497			`* Check if the two versions match.`
498			`*/`
499			`if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)`
500			`printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",`
501			`buff, bios_version);`
502			`}`
503
504			`return 0;`
505			`}`
506
507			`static int __init i8k_init(void)`
508			`{`
509			`struct proc_dir_entry *proc_i8k;`
510
511			`/* Are we running on an supported laptop? */`
512			`if (i8k_probe())`
513			`return -ENODEV;`
514
515			`/* Register the proc entry */`
516			`proc_i8k = create_proc_entry("i8k", 0, NULL);`
517			`if (!proc_i8k)`
518			`return -ENOENT;`
519
520			`proc_i8k->proc_fops = &i8k_fops;`
521			`proc_i8k->owner = THIS_MODULE;`
522
523			`printk(KERN_INFO`
524			`"Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",`
525			`I8K_VERSION);`
526
527			`return 0;`
528			`}`
529
530			`static void __exit i8k_exit(void)`
531			`{`
532			`remove_proc_entry("i8k", NULL);`
533			`}`
534
535			`module_init(i8k_init);`
536			`module_exit(i8k_exit);`