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Diffstat (limited to 'drivers/char/i8k.c')
-rw-r--r--drivers/char/i8k.c1203
1 files changed, 617 insertions, 586 deletions
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index a8119764028..93dcad0c1cb 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -1,10 +1,12 @@
/*
* 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>
*
+ * Hwmon integration:
+ * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
+ * Copyright (C) 2013 Guenter Roeck <linux@roeck-us.net>
+ *
* 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
@@ -16,26 +18,32 @@
* General Public License for more details.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
-#include <linux/apm_bios.h>
-#include <asm/uaccess.h>
-#include <asm/io.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/i8k.h>
-#define I8K_VERSION "1.13 14/05/2002"
-
#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_SIG 0xffa3
-#define I8K_SMM_BIOS_VERSION 0x00a6
+#define I8K_SMM_GET_DELL_SIG1 0xfea3
+#define I8K_SMM_GET_DELL_SIG2 0xffa3
#define I8K_FAN_MULT 30
#define I8K_MAX_TEMP 127
@@ -52,124 +60,152 @@
#define I8K_TEMPERATURE_BUG 1
-#define DELL_SIGNATURE "Dell Computer"
-
-static char *supported_models[] = {
- "Inspiron",
- "Latitude",
- NULL
-};
+static DEFINE_MUTEX(i8k_mutex);
+static char bios_version[4];
+static struct device *i8k_hwmon_dev;
+static u32 i8k_hwmon_flags;
+static int i8k_fan_mult;
-static char system_vendor[48] = "?";
-static char product_name [48] = "?";
-static char bios_version [4] = "?";
-static char serial_number[16] = "?";
+#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)
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
MODULE_LICENSE("GPL");
-static int force;
+static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");
-static int restricted;
+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");
+
+static bool restricted;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
-static int power_status;
+static bool power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
-static ssize_t i8k_read(struct file *, char __user *, size_t, loff_t *);
-static int i8k_ioctl(struct inode *, struct file *, unsigned int,
- unsigned long);
+static int fan_mult = I8K_FAN_MULT;
+module_param(fan_mult, int, 0);
+MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
-static struct file_operations i8k_fops = {
- .read = i8k_read,
- .ioctl = i8k_ioctl,
+static int i8k_open_fs(struct inode *inode, struct file *file);
+static long i8k_ioctl(struct file *, unsigned int, unsigned long);
+
+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,
};
-typedef struct {
- 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));
-} SMMRegisters;
-
-typedef struct {
- u8 type;
- u8 length;
- u16 handle;
-} DMIHeader;
+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;
+};
-/*
- * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
- */
-static int i8k_smm(SMMRegisters *regs)
+static inline const char *i8k_get_dmi_data(int field)
{
- 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;
+ const char *dmi_data = dmi_get_system_info(field);
+
+ return dmi_data && *dmi_data ? dmi_data : "?";
}
/*
- * Read the bios version. Return the version as an integer corresponding
- * to the ascii value, for example "A17" is returned as 0x00413137.
+ * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
*/
-static int i8k_get_bios_version(void)
+static int i8k_smm(struct smm_regs *regs)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
-
- regs.eax = I8K_SMM_BIOS_VERSION;
- if ((rc=i8k_smm(&regs)) < 0) {
- return rc;
- }
+ int rc;
+ int eax = regs->eax;
+ cpumask_var_t old_mask;
+
+ /* SMM requires CPU 0 */
+ if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
+ return -ENOMEM;
+ cpumask_copy(old_mask, &current->cpus_allowed);
+ rc = set_cpus_allowed_ptr(current, cpumask_of(0));
+ if (rc)
+ goto out;
+ if (smp_processor_id() != 0) {
+ rc = -EBUSY;
+ goto out;
+ }
- return regs.eax;
-}
+#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;
-/*
- * Read the machine id.
- */
-static int i8k_get_serial_number(unsigned char *buff)
-{
- strlcpy(buff, serial_number, sizeof(serial_number));
- return 0;
+out:
+ set_cpus_allowed_ptr(current, old_mask);
+ free_cpumask_var(old_mask);
+ return rc;
}
/*
@@ -177,24 +213,23 @@ static int i8k_get_serial_number(unsigned char *buff)
*/
static int i8k_get_fn_status(void)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
-
- regs.eax = I8K_SMM_FN_STATUS;
- 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;
- }
+ 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;
+ }
}
/*
@@ -202,20 +237,14 @@ static int i8k_get_fn_status(void)
*/
static int i8k_get_power_status(void)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
+ struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
+ int rc;
- regs.eax = I8K_SMM_POWER_STATUS;
- if ((rc=i8k_smm(&regs)) < 0) {
- return rc;
- }
-
- switch (regs.eax & 0xff) {
- case I8K_POWER_AC:
- return I8K_AC;
- default:
- return I8K_BATTERY;
- }
+ rc = i8k_smm(&regs);
+ if (rc < 0)
+ return rc;
+
+ return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
}
/*
@@ -223,16 +252,10 @@ static int i8k_get_power_status(void)
*/
static int i8k_get_fan_status(int fan)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
+ struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
- regs.eax = I8K_SMM_GET_FAN;
- regs.ebx = fan & 0xff;
- if ((rc=i8k_smm(&regs)) < 0) {
- return rc;
- }
-
- return (regs.eax & 0xff);
+ regs.ebx = fan & 0xff;
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
}
/*
@@ -240,16 +263,10 @@ static int i8k_get_fan_status(int fan)
*/
static int i8k_get_fan_speed(int fan)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
+ struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
- regs.eax = I8K_SMM_GET_SPEED;
- regs.ebx = fan & 0xff;
- if ((rc=i8k_smm(&regs)) < 0) {
- return rc;
- }
-
- return (regs.eax & 0xffff) * I8K_FAN_MULT;
+ regs.ebx = fan & 0xff;
+ return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
}
/*
@@ -257,532 +274,546 @@ static int i8k_get_fan_speed(int fan)
*/
static int i8k_set_fan(int fan, int speed)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
-
- speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
+ struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
- regs.eax = I8K_SMM_SET_FAN;
- regs.ebx = (fan & 0xff) | (speed << 8);
- if ((rc=i8k_smm(&regs)) < 0) {
- return rc;
- }
+ speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
+ regs.ebx = (fan & 0xff) | (speed << 8);
- return (i8k_get_fan_status(fan));
+ return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
}
/*
* Read the cpu temperature.
*/
-static int i8k_get_cpu_temp(void)
+static int i8k_get_temp(int sensor)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- int temp;
+ struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
+ int rc;
+ int temp;
#ifdef I8K_TEMPERATURE_BUG
- static int prev = 0;
+ static int prev[4];
#endif
+ regs.ebx = sensor & 0xff;
+ rc = i8k_smm(&regs);
+ if (rc < 0)
+ return rc;
- regs.eax = I8K_SMM_GET_TEMP;
- if ((rc=i8k_smm(&regs)) < 0) {
- return rc;
- }
- temp = regs.eax & 0xff;
+ 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;
- }
+ /*
+ * 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[sensor];
+ prev[sensor] = I8K_MAX_TEMP;
+ } else {
+ prev[sensor] = temp;
+ }
#endif
- return temp;
+ return temp;
}
-static int i8k_get_dell_signature(void)
+static int i8k_get_dell_signature(int req_fn)
{
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
+ struct smm_regs regs = { .eax = req_fn, };
+ int rc;
- regs.eax = I8K_SMM_GET_DELL_SIG;
- if ((rc=i8k_smm(&regs)) < 0) {
- return rc;
- }
+ rc = i8k_smm(&regs);
+ if (rc < 0)
+ return rc;
- if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) {
- return 0;
- } else {
- return -1;
- }
+ 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)
+static int
+i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
{
- int val;
- 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);
- val = i8k_get_serial_number(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_cpu_temp();
- break;
-
- case I8K_GET_SPEED:
- if (copy_from_user(&val, argp, sizeof(int))) {
- return -EFAULT;
- }
- val = i8k_get_fan_speed(val);
- break;
+ int val = 0;
+ int speed;
+ unsigned char buff[16];
+ int __user *argp = (int __user *)arg;
- case I8K_GET_FAN:
- if (copy_from_user(&val, argp, sizeof(int))) {
- return -EFAULT;
- }
- val = i8k_get_fan_status(val);
- break;
+ if (!argp)
+ return -EINVAL;
- 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;
+ switch (cmd) {
+ case I8K_BIOS_VERSION:
+ val = (bios_version[0] << 16) |
+ (bios_version[1] << 8) | bios_version[2];
+ break;
- default:
- return -EINVAL;
- }
+ case I8K_MACHINE_ID:
+ memset(buff, 0, 16);
+ strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
+ sizeof(buff));
+ break;
- if (val < 0) {
- return val;
- }
+ case I8K_FN_STATUS:
+ val = i8k_get_fn_status();
+ break;
- 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;
+ 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;
}
- break;
- }
- return 0;
-}
+ if (val < 0)
+ return val;
-/*
- * Print the information for /proc/i8k.
- */
-static int i8k_get_info(char *buffer, char **start, off_t fpos, int length)
-{
- int n, fn_key, cpu_temp, ac_power;
- int left_fan, right_fan, left_speed, right_speed;
-
- cpu_temp = i8k_get_cpu_temp(); /* 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
- */
- n = sprintf(buffer, "%s %s %s %d %d %d %d %d %d %d\n",
- I8K_PROC_FMT,
- bios_version,
- serial_number,
- cpu_temp,
- left_fan,
- right_fan,
- left_speed,
- right_speed,
- ac_power,
- fn_key);
-
- return n;
-}
+ switch (cmd) {
+ case I8K_BIOS_VERSION:
+ if (copy_to_user(argp, &val, 4))
+ return -EFAULT;
-static ssize_t i8k_read(struct file *f, char __user *buffer, size_t len, loff_t *fpos)
-{
- int n;
- char info[128];
+ 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;
- n = i8k_get_info(info, NULL, 0, 128);
- if (n <= 0) {
- return n;
- }
+ break;
+ }
- if (*fpos >= n) {
return 0;
- }
+}
- if ((*fpos + len) >= n) {
- len = n - *fpos;
- }
+static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
+{
+ long ret;
- if (copy_to_user(buffer, info, len) != 0) {
- return -EFAULT;
- }
+ mutex_lock(&i8k_mutex);
+ ret = i8k_ioctl_unlocked(fp, cmd, arg);
+ mutex_unlock(&i8k_mutex);
- *fpos += len;
- return len;
+ return ret;
}
-static char* __init string_trim(char *s, int size)
+/*
+ * Print the information for /proc/i8k.
+ */
+static int i8k_proc_show(struct seq_file *seq, void *offset)
{
- int len;
- char *p;
+ 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;
- if ((len = strlen(s)) > size) {
- len = size;
- }
-
- for (p=s+len-1; len && (*p==' '); len--,p--) {
- *p = '\0';
- }
+ /*
+ * 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);
+}
- return s;
+static int i8k_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, i8k_proc_show, NULL);
}
-/* DMI code, stolen from arch/i386/kernel/dmi_scan.c */
/*
- * |<-- dmi->length -->|
- * | |
- * |dmi header s=N | string1,\0, ..., stringN,\0, ..., \0
- * | |
- * +-----------------------+
+ * Hwmon interface
*/
-static char* __init dmi_string(DMIHeader *dmi, u8 s)
+
+static ssize_t i8k_hwmon_show_temp(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
{
- u8 *p;
+ int index = to_sensor_dev_attr(devattr)->index;
+ int temp;
- if (!s) {
- return "";
- }
- s--;
+ temp = i8k_get_temp(index);
+ if (temp < 0)
+ return temp;
+ return sprintf(buf, "%d\n", temp * 1000);
+}
- p = (u8 *)dmi + dmi->length;
- while (s > 0) {
- p += strlen(p);
- p++;
- s--;
- }
+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;
- return p;
+ fan_speed = i8k_get_fan_speed(index);
+ if (fan_speed < 0)
+ return fan_speed;
+ return sprintf(buf, "%d\n", fan_speed);
}
-static void __init dmi_decode(DMIHeader *dmi)
+static ssize_t i8k_hwmon_show_pwm(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
{
- u8 *data = (u8 *) dmi;
- char *p;
-
-#ifdef I8K_DEBUG
- int i;
- printk("%08x ", (int)data);
- for (i=0; i<data[1] && i<64; i++) {
- printk("%02x ", data[i]);
- }
- printk("\n");
-#endif
+ int index = to_sensor_dev_attr(devattr)->index;
+ int status;
- switch (dmi->type) {
- case 0: /* BIOS Information */
- p = dmi_string(dmi,data[5]);
- if (*p) {
- strlcpy(bios_version, p, sizeof(bios_version));
- string_trim(bios_version, sizeof(bios_version));
- }
- break;
- case 1: /* System Information */
- p = dmi_string(dmi,data[4]);
- if (*p) {
- strlcpy(system_vendor, p, sizeof(system_vendor));
- string_trim(system_vendor, sizeof(system_vendor));
- }
- p = dmi_string(dmi,data[5]);
- if (*p) {
- strlcpy(product_name, p, sizeof(product_name));
- string_trim(product_name, sizeof(product_name));
- }
- p = dmi_string(dmi,data[7]);
- if (*p) {
- strlcpy(serial_number, p, sizeof(serial_number));
- string_trim(serial_number, sizeof(serial_number));
- }
- break;
- }
+ status = i8k_get_fan_status(index);
+ if (status < 0)
+ return -EIO;
+ return sprintf(buf, "%d\n", clamp_val(status * 128, 0, 255));
}
-static int __init dmi_table(u32 base, int len, int num, void (*fn)(DMIHeader*))
+static ssize_t i8k_hwmon_set_pwm(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
- u8 *buf;
- u8 *data;
- DMIHeader *dmi;
- int i = 1;
-
- buf = ioremap(base, len);
- if (buf == NULL) {
- return -1;
- }
- data = buf;
-
- /*
- * Stop when we see al the items the table claimed to have
- * or we run off the end of the table (also happens)
- */
- while ((i<num) && ((data-buf) < len)) {
- dmi = (DMIHeader *)data;
- /*
- * Avoid misparsing crud if the length of the last
- * record is crap
- */
- if ((data-buf+dmi->length) >= len) {
- break;
- }
- fn(dmi);
- data += dmi->length;
- /*
- * Don't go off the end of the data if there is
- * stuff looking like string fill past the end
- */
- while (((data-buf) < len) && (*data || data[1])) {
- data++;
- }
- data += 2;
- i++;
- }
- iounmap(buf);
+ 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, 128), 0, 2);
+
+ mutex_lock(&i8k_mutex);
+ err = i8k_set_fan(index, val);
+ mutex_unlock(&i8k_mutex);
- return 0;
+ return err < 0 ? -EIO : count;
}
-static int __init dmi_iterate(void (*decode)(DMIHeader *))
+static ssize_t i8k_hwmon_show_label(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
{
- unsigned char buf[20];
- void __iomem *p = ioremap(0xe0000, 0x20000), *q;
-
- if (!p)
- return -1;
-
- for (q = p; q < p + 0x20000; q += 16) {
- memcpy_fromio(buf, q, 20);
- if (memcmp(buf, "_DMI_", 5)==0) {
- u16 num = buf[13]<<8 | buf[12];
- u16 len = buf [7]<<8 | buf [6];
- u32 base = buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8];
-#ifdef I8K_DEBUG
- printk(KERN_INFO "DMI %d.%d present.\n",
- buf[14]>>4, buf[14]&0x0F);
- printk(KERN_INFO "%d structures occupying %d bytes.\n",
- buf[13]<<8 | buf[12],
- buf [7]<<8 | buf[6]);
- printk(KERN_INFO "DMI table at 0x%08X.\n",
- buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8]);
-#endif
- if (dmi_table(base, len, num, decode)==0) {
- iounmap(p);
- return 0;
- }
- }
- }
- iounmap(p);
- return -1;
+ static const char *labels[3] = {
+ "CPU",
+ "Left Fan",
+ "Right Fan",
+ };
+ int index = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%s\n", labels[index]);
}
-/* end of DMI code */
-/*
- * Get DMI information.
- */
-static int __init i8k_dmi_probe(void)
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
+ I8K_FAN_LEFT);
+static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
+ i8k_hwmon_set_pwm, I8K_FAN_LEFT);
+static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
+ I8K_FAN_RIGHT);
+static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
+ i8k_hwmon_set_pwm, I8K_FAN_RIGHT);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 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_temp3_input.dev_attr.attr, /* 3 */
+ &sensor_dev_attr_temp4_input.dev_attr.attr, /* 4 */
+ &sensor_dev_attr_fan1_input.dev_attr.attr, /* 5 */
+ &sensor_dev_attr_pwm1.dev_attr.attr, /* 6 */
+ &sensor_dev_attr_fan1_label.dev_attr.attr, /* 7 */
+ &sensor_dev_attr_fan2_input.dev_attr.attr, /* 8 */
+ &sensor_dev_attr_pwm2.dev_attr.attr, /* 9 */
+ &sensor_dev_attr_fan2_label.dev_attr.attr, /* 10 */
+ NULL
+};
+
+static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
+ int index)
{
- char **p;
-
- if (dmi_iterate(dmi_decode) != 0) {
- printk(KERN_INFO "i8k: unable to get DMI information\n");
- return -ENODEV;
- }
-
- if (strncmp(system_vendor,DELL_SIGNATURE,strlen(DELL_SIGNATURE)) != 0) {
- printk(KERN_INFO "i8k: not running on a Dell system\n");
- return -ENODEV;
- }
-
- for (p=supported_models; ; p++) {
- if (!*p) {
- printk(KERN_INFO "i8k: unsupported model: %s\n", product_name);
- return -ENODEV;
- }
- if (strncmp(product_name,*p,strlen(*p)) == 0) {
- break;
- }
- }
+ if ((index == 0 || index == 1) &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
+ return 0;
+ if (index == 2 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
+ return 0;
+ if (index == 3 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
+ return 0;
+ if (index == 4 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
+ return 0;
+ if (index >= 5 && index <= 7 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
+ return 0;
+ if (index >= 8 && index <= 10 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
+ return 0;
+
+ return attr->mode;
+}
+
+static const struct attribute_group i8k_group = {
+ .attrs = i8k_attrs,
+ .is_visible = i8k_is_visible,
+};
+__ATTRIBUTE_GROUPS(i8k);
- return 0;
+static int __init i8k_init_hwmon(void)
+{
+ int err;
+
+ i8k_hwmon_flags = 0;
+
+ /* CPU temperature attributes, if temperature reading is OK */
+ err = i8k_get_temp(0);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
+ /* check for additional temperature sensors */
+ err = i8k_get_temp(1);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
+ err = i8k_get_temp(2);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
+ err = i8k_get_temp(3);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
+
+ /* Left fan attributes, if left fan is present */
+ err = i8k_get_fan_status(I8K_FAN_LEFT);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
+
+ /* Right fan attributes, if right fan is present */
+ err = i8k_get_fan_status(I8K_FAN_RIGHT);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
+
+ i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", 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;
}
+static struct dmi_system_id i8k_dmi_table[] __initdata = {
+ {
+ .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"),
+ },
+ },
+ { /* 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",
+ .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 *)1, /* fan multiplier override */
+ },
+ {
+ .ident = "Dell XPS M140",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
+ },
+ .driver_data = (void *)1, /* fan multiplier override */
+ },
+ { }
+};
+
/*
* Probe for the presence of a supported laptop.
*/
static int __init i8k_probe(void)
{
- char buff[4];
- int version;
- int smm_found = 0;
-
- /*
- * Get DMI information
- */
- if (i8k_dmi_probe() != 0) {
- printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
- system_vendor, product_name, bios_version);
- }
-
- /*
- * Get SMM Dell signature
- */
- if (i8k_get_dell_signature() != 0) {
- printk(KERN_INFO "i8k: unable to get SMM Dell signature\n");
- } else {
- smm_found = 1;
- }
-
- /*
- * Get SMM BIOS version.
- */
- version = i8k_get_bios_version();
- if (version <= 0) {
- printk(KERN_INFO "i8k: unable to get SMM BIOS version\n");
- } else {
- smm_found = 1;
- buff[0] = (version >> 16) & 0xff;
- buff[1] = (version >> 8) & 0xff;
- buff[2] = (version) & 0xff;
- buff[3] = '\0';
+ const struct dmi_system_id *id;
+
/*
- * If DMI BIOS version is unknown use SMM BIOS version.
+ * Get DMI information
*/
- if (bios_version[0] == '?') {
- strcpy(bios_version, buff);
+ 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));
}
+
+ strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
+ sizeof(bios_version));
+
/*
- * Check if the two versions match.
+ * Get SMM Dell signature
*/
- if (strncmp(buff,bios_version,sizeof(bios_version)) != 0) {
- printk(KERN_INFO "i8k: BIOS version mismatch: %s != %s\n",
- buff, bios_version);
+ 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;
}
- }
- if (!smm_found && !force) {
- return -ENODEV;
- }
+ i8k_fan_mult = fan_mult;
+ id = dmi_first_match(i8k_dmi_table);
+ if (id && fan_mult == I8K_FAN_MULT && id->driver_data)
+ i8k_fan_mult = (unsigned long)id->driver_data;
- return 0;
+ return 0;
}
-#ifdef MODULE
-static
-#endif
-int __init i8k_init(void)
+static int __init i8k_init(void)
{
- struct proc_dir_entry *proc_i8k;
-
- /* Are we running on an supported laptop? */
- if (i8k_probe() != 0) {
- return -ENODEV;
- }
-
- /* Register the proc entry */
- proc_i8k = create_proc_info_entry("i8k", 0, NULL, i8k_get_info);
- 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;
-}
+ struct proc_dir_entry *proc_i8k;
+ int err;
-#ifdef MODULE
-int init_module(void)
-{
- return i8k_init();
+ /* Are we running on an supported laptop? */
+ if (i8k_probe())
+ return -ENODEV;
+
+ /* Register the proc entry */
+ proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
+ if (!proc_i8k)
+ return -ENOENT;
+
+ err = i8k_init_hwmon();
+ if (err)
+ goto exit_remove_proc;
+
+ return 0;
+
+ exit_remove_proc:
+ remove_proc_entry("i8k", NULL);
+ return err;
}
-void cleanup_module(void)
+static void __exit i8k_exit(void)
{
- /* Remove the proc entry */
- remove_proc_entry("i8k", NULL);
-
- printk(KERN_INFO "i8k: module unloaded\n");
+ hwmon_device_unregister(i8k_hwmon_dev);
+ remove_proc_entry("i8k", NULL);
}
-#endif
-/* end of file */
+module_init(i8k_init);
+module_exit(i8k_exit);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-21 06:24:04 +0000