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Diffstat (limited to 'drivers/char/i8k.c')
-rw-r--r--drivers/char/i8k.c376
1 files changed, 295 insertions, 81 deletions
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 3bc0eef8871..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
@@ -16,6 +18,8 @@
* 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>
@@ -24,13 +28,14 @@
#include <linux/dmi.h>
#include <linux/capability.h>
#include <linux/mutex.h>
-#include <asm/uaccess.h>
-#include <asm/io.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 "1.14 21/02/2005"
-
#define I8K_SMM_FN_STATUS 0x0025
#define I8K_SMM_POWER_STATUS 0x0069
#define I8K_SMM_SET_FAN 0x01a3
@@ -39,7 +44,6 @@
#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
@@ -58,24 +62,34 @@
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;
+
+#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 ignore_dmi;
+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 int restricted;
+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");
@@ -97,11 +111,11 @@ static const struct file_operations i8k_fops = {
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));
+ 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)
@@ -118,9 +132,22 @@ static int i8k_smm(struct smm_regs *regs)
{
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;
+ }
#if defined(CONFIG_X86_64)
- asm("pushq %%rax\n\t"
+ asm volatile("pushq %%rax\n\t"
"movl 0(%%rax),%%edx\n\t"
"pushq %%rdx\n\t"
"movl 4(%%rax),%%ebx\n\t"
@@ -139,14 +166,14 @@ static int i8k_smm(struct smm_regs *regs)
"movl %%edi,20(%%rax)\n\t"
"popq %%rdx\n\t"
"movl %%edx,0(%%rax)\n\t"
- "lahf\n\t"
- "shrl $8,%%eax\n\t"
+ "pushfq\n\t"
+ "popq %%rax\n\t"
"andl $1,%%eax\n"
- :"=a"(rc)
+ : "=a"(rc)
: "a"(regs)
: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
#else
- asm("pushl %%eax\n\t"
+ asm volatile("pushl %%eax\n\t"
"movl 0(%%eax),%%edx\n\t"
"push %%edx\n\t"
"movl 4(%%eax),%%ebx\n\t"
@@ -167,25 +194,18 @@ static int i8k_smm(struct smm_regs *regs)
"movl %%edx,0(%%eax)\n\t"
"lahf\n\t"
"shrl $8,%%eax\n\t"
- "andl $1,%%eax\n":"=a"(rc)
+ "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)
- return -EINVAL;
+ rc = -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;
+out:
+ set_cpus_allowed_ptr(current, old_mask);
+ free_cpumask_var(old_mask);
+ return rc;
}
/*
@@ -196,7 +216,8 @@ static int i8k_get_fn_status(void)
struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
int rc;
- if ((rc = i8k_smm(&regs)) < 0)
+ rc = i8k_smm(&regs);
+ if (rc < 0)
return rc;
switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
@@ -219,7 +240,8 @@ static int i8k_get_power_status(void)
struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
int rc;
- if ((rc = i8k_smm(&regs)) < 0)
+ rc = i8k_smm(&regs);
+ if (rc < 0)
return rc;
return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
@@ -244,7 +266,7 @@ 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) * fan_mult;
+ return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
}
/*
@@ -270,10 +292,11 @@ static int i8k_get_temp(int sensor)
int temp;
#ifdef I8K_TEMPERATURE_BUG
- static int prev;
+ static int prev[4];
#endif
regs.ebx = sensor & 0xff;
- if ((rc = i8k_smm(&regs)) < 0)
+ rc = i8k_smm(&regs);
+ if (rc < 0)
return rc;
temp = regs.eax & 0xff;
@@ -287,10 +310,10 @@ static int i8k_get_temp(int sensor)
# 1003655139 00000054 00005c52
*/
if (temp > I8K_MAX_TEMP) {
- temp = prev;
- prev = I8K_MAX_TEMP;
+ temp = prev[sensor];
+ prev[sensor] = I8K_MAX_TEMP;
} else {
- prev = temp;
+ prev[sensor] = temp;
}
#endif
@@ -302,7 +325,8 @@ static int i8k_get_dell_signature(int req_fn)
struct smm_regs regs = { .eax = req_fn, };
int rc;
- if ((rc = i8k_smm(&regs)) < 0)
+ rc = i8k_smm(&regs);
+ if (rc < 0)
return rc;
return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
@@ -321,12 +345,14 @@ i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
switch (cmd) {
case I8K_BIOS_VERSION:
- val = i8k_get_bios_version();
+ val = (bios_version[0] << 16) |
+ (bios_version[1] << 8) | bios_version[2];
break;
case I8K_MACHINE_ID:
memset(buff, 0, 16);
- strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
+ strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
+ sizeof(buff));
break;
case I8K_FN_STATUS:
@@ -454,7 +480,186 @@ 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[] = {
+
+/*
+ * Hwmon interface
+ */
+
+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);
+}
+
+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);
+}
+
+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 * 128, 0, 255));
+}
+
+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, 128), 0, 2);
+
+ mutex_lock(&i8k_mutex);
+ err = i8k_set_fan(index, val);
+ mutex_unlock(&i8k_mutex);
+
+ return err < 0 ? -EIO : count;
+}
+
+static ssize_t i8k_hwmon_show_label(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ 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]);
+}
+
+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)
+{
+ 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);
+
+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 = {
@@ -511,7 +716,30 @@ static struct dmi_system_id __initdata i8k_dmi_table[] = {
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 */
+ },
+ { }
};
/*
@@ -519,8 +747,7 @@ static struct dmi_system_id __initdata i8k_dmi_table[] = {
*/
static int __init i8k_probe(void)
{
- char buff[4];
- int version;
+ const struct dmi_system_id *id;
/*
* Get DMI information
@@ -529,49 +756,30 @@ static int __init i8k_probe(void)
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",
+ 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));
+ 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");
+ pr_err("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);
- }
+ 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;
}
@@ -579,6 +787,7 @@ static int __init i8k_probe(void)
static int __init i8k_init(void)
{
struct proc_dir_entry *proc_i8k;
+ int err;
/* Are we running on an supported laptop? */
if (i8k_probe())
@@ -589,15 +798,20 @@ static int __init i8k_init(void)
if (!proc_i8k)
return -ENOENT;
- printk(KERN_INFO
- "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
- I8K_VERSION);
+ err = i8k_init_hwmon();
+ if (err)
+ goto exit_remove_proc;
return 0;
+
+ exit_remove_proc:
+ remove_proc_entry("i8k", NULL);
+ return err;
}
static void __exit i8k_exit(void)
{
+ hwmon_device_unregister(i8k_hwmon_dev);
remove_proc_entry("i8k", NULL);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-03 18:30:34 +0000