cregit-Linux how code gets into the kernel

Release 4.14 drivers/hwmon/dell-smm-hwmon.c

Directory: drivers/hwmon
/*
 * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
 *
 * Copyright (C) 2001  Massimo Dal Zotto <dz@debian.org>
 *
 * Hwmon integration:
 * Copyright (C) 2011  Jean Delvare <jdelvare@suse.de>
 * Copyright (C) 2013, 2014  Guenter Roeck <linux@roeck-us.net>
 * Copyright (C) 2014, 2015  Pali Rohár <pali.rohar@gmail.com>
 *
 * 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.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/cpu.h>
#include <linux/delay.h>
#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 <linux/mutex.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/smp.h>

#include <linux/i8k.h>


#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_FAN_TYPE	0x03a3

#define I8K_SMM_GET_NOM_SPEED	0x04a3

#define I8K_SMM_GET_TEMP	0x10a3

#define I8K_SMM_GET_TEMP_TYPE	0x11a3

#define I8K_SMM_GET_DELL_SIG1	0xfea3

#define I8K_SMM_GET_DELL_SIG2	0xffa3


#define I8K_FAN_MULT		30

#define I8K_FAN_MAX_RPM		30000

#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

static DEFINE_MUTEX(i8k_mutex);

static char bios_version[4];

static char bios_machineid[16];

static struct device *i8k_hwmon_dev;

static u32 i8k_hwmon_flags;

static uint i8k_fan_mult = I8K_FAN_MULT;

static uint i8k_pwm_mult;

static uint i8k_fan_max = I8K_FAN_HIGH;

static bool disallow_fan_type_call;


#define I8K_HWMON_HAVE_TEMP1	(1 << 0)

#define I8K_HWMON_HAVE_TEMP2	(1 << 1)

#define I8K_HWMON_HAVE_TEMP3	(1 << 2)

#define I8K_HWMON_HAVE_TEMP4	(1 << 3)

#define I8K_HWMON_HAVE_FAN1	(1 << 4)

#define I8K_HWMON_HAVE_FAN2	(1 << 5)

#define I8K_HWMON_HAVE_FAN3	(1 << 6)

MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("i8k");


static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");


static bool ignore_dmi;
module_param(ignore_dmi, bool, 0);
MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");

#if IS_ENABLED(CONFIG_I8K)

static bool restricted = true;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");


static bool power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
#endif


static uint fan_mult;
module_param(fan_mult, uint, 0);
MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");


static uint fan_max;
module_param(fan_max, uint, 0);
MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");


struct smm_regs {
	
unsigned int eax;
	
unsigned int ebx __packed;
	
unsigned int ecx __packed;
	
unsigned int edx __packed;
	
unsigned int esi __packed;
	
unsigned int edi __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 : "?"; }

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/* * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. */
static int i8k_smm_func(void *par) { int rc; struct smm_regs *regs = par; int eax = regs->eax; #ifdef DEBUG int ebx = regs->ebx; unsigned long duration; ktime_t calltime, delta, rettime; calltime = ktime_get(); #endif /* SMM requires CPU 0 */ if (smp_processor_id() != 0) return -EBUSY; #if defined(CONFIG_X86_64) asm volatile("pushq %%rax\n\t" "movl 0(%%rax),%%edx\n\t" "pushq %%rdx\n\t" "movl 4(%%rax),%%ebx\n\t" "movl 8(%%rax),%%ecx\n\t" "movl 12(%%rax),%%edx\n\t" "movl 16(%%rax),%%esi\n\t" "movl 20(%%rax),%%edi\n\t" "popq %%rax\n\t" "out %%al,$0xb2\n\t" "out %%al,$0x84\n\t" "xchgq %%rax,(%%rsp)\n\t" "movl %%ebx,4(%%rax)\n\t" "movl %%ecx,8(%%rax)\n\t" "movl %%edx,12(%%rax)\n\t" "movl %%esi,16(%%rax)\n\t" "movl %%edi,20(%%rax)\n\t" "popq %%rdx\n\t" "movl %%edx,0(%%rax)\n\t" "pushfq\n\t" "popq %%rax\n\t" "andl $1,%%eax\n" : "=a"(rc) : "a"(regs) : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); #else asm volatile("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"); #endif if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) rc = -EINVAL; #ifdef DEBUG rettime = ktime_get(); delta = ktime_sub(rettime, calltime); duration = ktime_to_ns(delta) >> 10; pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx, (rc ? 0xffff : regs->eax & 0xffff), duration); #endif return rc; }

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Pali Rohár7948.17%112.50%
Linus Torvalds4326.22%225.00%
Guenter Roeck169.76%225.00%
Juergen Gross127.32%112.50%
Bradley Smith106.10%112.50%
Jim Bos42.44%112.50%
Total164100.00%8100.00%

/* * Call the System Management Mode BIOS. */
static int i8k_smm(struct smm_regs *regs) { int ret; get_online_cpus(); ret = smp_call_on_cpu(0, i8k_smm_func, regs, true); put_online_cpus(); return ret; }

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Juergen Gross36100.00%1100.00%
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/* * 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; }

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Linus Torvalds3583.33%150.00%
Dmitry Torokhov716.67%150.00%
Total42100.00%2100.00%

/* * 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; }

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Linus Torvalds3882.61%133.33%
Dmitry Torokhov715.22%133.33%
Guenter Roeck12.17%133.33%
Total46100.00%3100.00%

/* * Read the fan type. */
static int _i8k_get_fan_type(int fan) { struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; if (disallow_fan_type_call) return -EINVAL; regs.ebx = fan & 0xff; return i8k_smm(&regs) ? : regs.eax & 0xff; }

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Pali Rohár50100.00%3100.00%
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static int i8k_get_fan_type(int fan) { /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ static int types[3] = { INT_MIN, INT_MIN, INT_MIN }; if (types[fan] == INT_MIN) types[fan] = _i8k_get_fan_type(fan); return types[fan]; }

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/* * Read the fan nominal rpm for specific fan speed. */
static int i8k_get_fan_nominal_speed(int fan, int speed) { struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; regs.ebx = (fan & 0xff) | (speed << 8); return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult; }

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/* * 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); }

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Linus Torvalds6283.78%133.33%
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Guenter Roeck22.70%133.33%
Total74100.00%3100.00%


static int i8k_get_temp_type(int sensor) { struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; regs.ebx = sensor & 0xff; return i8k_smm(&regs) ? : regs.eax & 0xff; }

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Pali Rohár42100.00%1100.00%
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/* * Read the cpu temperature. */
static int _i8k_get_temp(int sensor) { struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, .ebx = sensor & 0xff, }; return i8k_smm(&regs) ? : regs.eax & 0xff; }

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Linus Torvalds1843.90%120.00%
Dmitry Torokhov1434.15%240.00%
Guenter Roeck819.51%120.00%
Pali Rohár12.44%120.00%
Total41100.00%5100.00%


static int i8k_get_temp(int sensor) { int temp = _i8k_get_temp(sensor); /* * Sometimes the temperature sensor returns 0x99, which is out of range. * In this case we retry (once) before returning an error. # 1003655137 00000058 00005a4b # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees # 1003655139 00000054 00005c52 */ if (temp == 0x99) { msleep(100); temp = _i8k_get_temp(sensor); } /* * Return -ENODATA for all invalid temperatures. * * Known instances are the 0x99 value as seen above as well as * 0xc1 (193), which may be returned when trying to read the GPU * temperature if the system supports a GPU and it is currently * turned off. */ if (temp > I8K_MAX_TEMP) return -ENODATA; return temp; }

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Guenter Roeck2446.15%133.33%
Pali Rohár2140.38%133.33%
Linus Torvalds713.46%133.33%
Total52100.00%3100.00%


static int i8k_get_dell_signature(int req_fn) { struct smm_regs regs = { .eax = req_fn, }; int rc; rc = i8k_smm(&regs); if (rc < 0) return rc; return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; }

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Pali Rohár58100.00%1100.00%
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#if IS_ENABLED(CONFIG_I8K) /* * Read the Fn key status. */
static int i8k_get_fn_status(void) { struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; int rc; rc = i8k_smm(&regs); if (rc < 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; } }

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Pali Rohár6992.00%250.00%
Linus Torvalds45.33%125.00%
Guenter Roeck22.67%125.00%
Total75100.00%4100.00%

/* * Read the power status. */
static int i8k_get_power_status(void) { struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; int rc; rc = i8k_smm(&regs); if (rc < 0) return rc; return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; }

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Linus Torvalds3055.56%125.00%
Pali Rohár1018.52%125.00%
Dmitry Torokhov1018.52%125.00%
Guenter Roeck47.41%125.00%
Total54100.00%4100.00%

/* * Procfs interface */
static int i8k_ioctl_unlocked(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: if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) || !isdigit(bios_version[2])) return -EINVAL; val = (bios_version[0] << 16) | (bios_version[1] << 8) | bios_version[2]; break; case I8K_MACHINE_ID: if (restricted && !capable(CAP_SYS_ADMIN)) return -EPERM; memset(buff, 0, sizeof(buff)); strlcpy(buff, bios_machineid, 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; }

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Pali Rohár5212.87%222.22%
Guenter Roeck225.45%111.11%
Al Viro204.95%111.11%
James H. Cloos Jr143.47%111.11%
Dmitry Torokhov133.22%222.22%
Frédéric Weisbecker10.25%111.11%
Total404100.00%9100.00%


static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) { long ret; mutex_lock(&i8k_mutex); ret = i8k_ioctl_unlocked(fp, cmd, arg); mutex_unlock(&i8k_mutex); return ret; }

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/* * 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 */ seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", I8K_PROC_FMT, bios_version, (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid, cpu_temp, left_fan, right_fan, left_speed, right_speed, ac_power, fn_key); return 0; }

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Pali Rohár118.09%111.11%
Jan Engelhardt75.15%111.11%
Joe Perches32.21%111.11%
Total136100.00%9100.00%


static int i8k_open_fs(struct inode *inode, struct file *file) { return single_open(file, i8k_proc_show, NULL); }

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static const struct file_operations i8k_fops = { .owner = THIS_MODULE, .open = i8k_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, .unlocked_ioctl = i8k_ioctl, };
static void __init i8k_init_procfs(void) { /* Register the proc entry */ proc_create("i8k", 0, NULL, &i8k_fops); }

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static void __exit i8k_exit_procfs(void) { remove_proc_entry("i8k", NULL); }

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#else
static inline void __init i8k_init_procfs(void) { }

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static inline void __exit i8k_exit_procfs(void) { }

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#endif /* * Hwmon interface */
static ssize_t i8k_hwmon_show_temp_label(struct device *dev, struct device_attribute *devattr, char *buf) { static const char * const labels[] = { "CPU", "GPU", "SODIMM", "Other", "Ambient", "Other", }; int index = to_sensor_dev_attr(devattr)->index; int type; type = i8k_get_temp_type(index); if (type < 0) return type; if (type >= ARRAY_SIZE(labels)) type = ARRAY_SIZE(labels) - 1; return sprintf(buf, "%s\n", labels[type]); }

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static ssize_t i8k_hwmon_show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; int temp; temp = i8k_get_temp(index); if (temp < 0) return temp; return sprintf(buf, "%d\n", temp * 1000); }

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Jean Delvare4573.77%150.00%
Guenter Roeck1626.23%150.00%
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static ssize_t i8k_hwmon_show_fan_label(struct device *dev, struct device_attribute *devattr, char *buf) { static const char * const labels[] = { "Processor Fan", "Motherboard Fan", "Video Fan", "Power Supply Fan", "Chipset Fan", "Other Fan", }; int index = to_sensor_dev_attr(devattr)->index; bool dock = false; int type; type = i8k_get_fan_type(index); if (type < 0) return type; if (type & 0x10) { dock = true; type &= 0x0F; } if (type >= ARRAY_SIZE(labels)) type = (ARRAY_SIZE(labels) - 1); return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); }

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static ssize_t i8k_hwmon_show_fan(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; int fan_speed; fan_speed = i8k_get_fan_speed(index); if (fan_speed < 0) return fan_speed; return sprintf(buf, "%d\n", fan_speed); }

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Jean Delvare59100.00%1100.00%
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static ssize_t i8k_hwmon_show_pwm(struct device *dev, struct device_attribute *devattr, char *buf) { int index = to_sensor_dev_attr(devattr)->index; int status; status = i8k_get_fan_status(index); if (status < 0) return -EIO; return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); }

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Guenter Roeck69100.00%2100.00%
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static ssize_t i8k_hwmon_set_pwm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int index = to_sensor_dev_attr(attr)->index; unsigned long val; int err; err = kstrtoul(buf, 10, &val); if (err) return err; val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); mutex_lock(&i8k_mutex); err = i8k_set_fan(index, val); mutex_unlock(&i8k_mutex); return err < 0 ? -EIO : count; }

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Guenter Roeck107100.00%2100.00%
Total107100.00%2100.00%

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 0); static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1); static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 1); static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2); static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 2); static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3); static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 3); static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0); static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 0); static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, i8k_hwmon_set_pwm, 0); static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 1); static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 1); static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, i8k_hwmon_set_pwm, 1); static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 2); static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 2); static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, i8k_hwmon_set_pwm, 2); static struct attribute *i8k_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */ &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */ &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */ &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */ &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */ &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */ &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */ &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */ &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */ NULL };
static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, int index) { if (disallow_fan_type_call && (index == 9 || index == 12 || index == 15)) return 0; if (index >= 0 && index <= 1 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) return 0; if (index >= 2 && index <= 3 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) return 0; if (index >= 4 && index <= 5 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) return 0; if (index >= 6 && index <= 7 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) return 0; if (index >= 8 && index <= 10 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) return 0; if (index >= 11 && index <= 13 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) return 0; if (index >= 14 && index <= 16 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3)) return 0; return attr->mode; }

Contributors

PersonTokensPropCommitsCommitProp
Guenter Roeck10154.59%337.50%
Pali Rohár6836.76%450.00%
Jean Delvare168.65%112.50%
Total185100.00%8100.00%

static const struct attribute_group i8k_group = { .attrs = i8k_attrs, .is_visible = i8k_is_visible, }; __ATTRIBUTE_GROUPS(i8k);
static int __init i8k_init_hwmon(void) { int err; i8k_hwmon_flags = 0; /* CPU temperature attributes, if temperature type is OK */ err = i8k_get_temp_type(0); if (err >= 0) i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; /* check for additional temperature sensors */ err = i8k_get_temp_type(1); if (err >= 0) i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; err = i8k_get_temp_type(2); if (err >= 0) i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; err = i8k_get_temp_type(3); if (err >= 0) i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; /* First fan attributes, if fan status or type is OK */ err = i8k_get_fan_status(0); if (err < 0) err = i8k_get_fan_type(0); if (err >= 0) i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; /* Second fan attributes, if fan status or type is OK */ err = i8k_get_fan_status(1); if (err < 0) err = i8k_get_fan_type(1); if (err >= 0) i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; /* Third fan attributes, if fan status or type is OK */ err = i8k_get_fan_status(2); if (err < 0) err = i8k_get_fan_type(2); if (err >= 0) i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3; i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", NULL, i8k_groups); if (IS_ERR(i8k_hwmon_dev)) { err = PTR_ERR(i8k_hwmon_dev); i8k_hwmon_dev = NULL; pr_err("hwmon registration failed (%d)\n", err); return err; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Guenter Roeck9642.67%225.00%
Pali Rohár6830.22%450.00%
Jean Delvare6026.67%112.50%
Gabriele Mazzotta10.44%112.50%
Total225100.00%8100.00%

struct i8k_config_data { uint fan_mult; uint fan_max; }; enum i8k_configs { DELL_LATITUDE_D520, DELL_PRECISION_490, DELL_STUDIO, DELL_XPS, }; static const struct i8k_config_data i8k_config_data[] = { [DELL_LATITUDE_D520] = { .fan_mult = 1, .fan_max = I8K_FAN_TURBO, }, [DELL_PRECISION_490] = { .fan_mult = 1, .fan_max = I8K_FAN_TURBO, }, [DELL_STUDIO] = { .fan_mult = 1, .fan_max = I8K_FAN_HIGH, }, [DELL_XPS] = { .fan_mult = 1, .fan_max = I8K_FAN_HIGH, }, }; static const struct dmi_system_id i8k_dmi_table[] __initconst = { { .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 D520", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), }, .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], }, { .ident = "Dell Latitude 2", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), }, }, { /* UK Inspiron 6400 */ .ident = "Dell Inspiron 3", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), }, }, { .ident = "Dell Inspiron 3", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), }, }, { .ident = "Dell Precision 490", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation 490"), }, .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], }, { .ident = "Dell Precision", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), }, }, { .ident = "Dell Vostro", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), }, }, { .ident = "Dell XPS421", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), }, }, { .ident = "Dell Studio", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), }, .driver_data = (void *)&i8k_config_data[DELL_STUDIO], }, { .ident = "Dell XPS 13", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"), }, .driver_data = (void *)&i8k_config_data[DELL_XPS], }, { .ident = "Dell XPS M140", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), }, .driver_data = (void *)&i8k_config_data[DELL_XPS], }, { .ident = "Dell XPS 15 9560", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"), }, }, { } }; MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); /* * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 */ static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = { { .ident = "Dell Studio XPS 8000", .matches = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), }, }, { .ident = "Dell Studio XPS 8100", .matches = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), }, }, { .ident = "Dell Inspiron 580", .matches = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), }, }, { } }; /* * Probe for the presence of a supported laptop. */
static int __init i8k_probe(void) { const struct dmi_system_id *id; int fan, ret; /* * Get DMI information */ if (!dmi_check_system(i8k_dmi_table)) { if (!ignore_dmi && !force) return -ENODEV; pr_info("not running on a supported Dell system.\n"); pr_info("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)); } if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) disallow_fan_type_call = true; strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version)); strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(bios_machineid)); /* * Get SMM Dell signature */ if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { pr_err("unable to get SMM Dell signature\n"); if (!force) return -ENODEV; } /* * Set fan multiplier and maximal fan speed from dmi config * Values specified in module parameters override values from dmi */ id = dmi_first_match(i8k_dmi_table); if (id && id->driver_data) { const struct i8k_config_data *conf = id->driver_data; if (!fan_mult && conf->fan_mult) fan_mult = conf->fan_mult; if (!fan_max && conf->fan_max) fan_max = conf->fan_max; } i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); if (!fan_mult) { /* * Autodetect fan multiplier based on nominal rpm * If fan reports rpm value too high then set multiplier to 1 */ for (fan = 0; fan < 2; ++fan) { ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); if (ret < 0) continue; if (ret > I8K_FAN_MAX_RPM) i8k_fan_mult = 1; break; } } else { /* Fan multiplier was specified in module param or in dmi */ i8k_fan_mult = fan_mult; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pali Rohár10237.23%325.00%
Guenter Roeck7427.01%325.00%
Dmitry Torokhov5218.98%325.00%
Linus Torvalds4416.06%216.67%
Al Viro20.73%18.33%
Total274100.00%12100.00%


static int __init i8k_init(void) { int err; /* Are we running on an supported laptop? */ if (i8k_probe()) return -ENODEV; err = i8k_init_hwmon(); if (err) return err; i8k_init_procfs(); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2050.00%240.00%
Jean Delvare1537.50%120.00%
Pali Rohár410.00%120.00%
Dmitry Torokhov12.50%120.00%
Total40100.00%5100.00%


static void __exit i8k_exit(void) { hwmon_device_unregister(i8k_hwmon_dev); i8k_exit_procfs(); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds741.18%120.00%
Guenter Roeck423.53%120.00%
Dmitry Torokhov317.65%120.00%
Pali Rohár211.76%120.00%
Jean Delvare15.88%120.00%
Total17100.00%5100.00%

module_init(i8k_init); module_exit(i8k_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Pali Rohár146633.47%1726.15%
Guenter Roeck105124.00%1523.08%
Linus Torvalds87620.00%23.08%
Dmitry Torokhov3457.88%812.31%
Jean Delvare2726.21%11.54%
Juergen Gross551.26%11.54%
Frédéric Weisbecker410.94%11.54%
Nick Warne270.62%11.54%
Frank Sorenson260.59%11.54%
Thorsten Leemhuis260.59%11.54%
Federico Heinz260.59%11.54%
Andy Spencer260.59%11.54%
Alan Cox260.59%11.54%
James H. Cloos Jr230.53%11.54%
Al Viro220.50%23.08%
Arnd Bergmann170.39%11.54%
Jochen Eisinger170.39%11.54%
Bradley Smith100.23%11.54%
Jan Engelhardt70.16%11.54%
Rusty Russell40.09%11.54%
Jim Bos40.09%11.54%
Christoph Hellwig40.09%11.54%
Joe Perches30.07%11.54%
Alexey Dobriyan30.07%11.54%
Jeff Garzik20.05%11.54%
Gabriele Mazzotta10.02%11.54%
Total4380100.00%65100.00%
Directory: drivers/hwmon
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