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hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k 

This patch splits CONFIG_I8K compile option to SENSORS_DELL_SMM and CONFIG_I8K.
Option SENSORS_DELL_SMM is now used to enable compilation of dell-smm-hwmon
driver and old CONFIG_I8K option to enable /proc/i8k interface in driver.

So this change allows to compile dell-smm-hwmon driver without legacy /proc/i8k
interface which is needed only for old Dell Inspirion models or for userspace
i8kutils package.

For backward compatibility when CONFIG_I8K is enabled then also SENSORS_DELL_SMM
is enabled and so driver dell-smm-hwmon (with /proc/i8k) is compiled.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pali Rohár 2015-05-14 13:16:37 +02:00 committed by Greg Kroah-Hartman
parent a5afba16c6
commit 039ae58503
4 changed files with 106 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
arch/x86/Kconfig
View File

@ -1055,24 +1055,19 @@ config TOSHIBA
Say N otherwise.
config I8K
tristate "Dell laptop support"
tristate "Dell i8k legacy laptop support"
select HWMON
select SENSORS_DELL_SMM
---help---
This adds a driver to safely access the System Management Mode
of the CPU on the Dell Inspiron 8000. The System Management Mode
is used to read cpu temperature and cooling fan status and to
control the fans on the I8K portables.
This option enables legacy /proc/i8k userspace interface in hwmon
dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
temperature and allows controlling fan speeds of Dell laptops via
System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
it reports also power and hotkey status. For fan speed control is
needed userspace package i8kutils.
This driver has been tested only on the Inspiron 8000 but it may
also work with other Dell laptops. You can force loading on other
models by passing the parameter `force=1' to the module. Use at
your own risk.
For information on utilities to make use of this driver see the
I8K Linux utilities web site at:
<http://people.debian.org/~dz/i8k/>
Say Y if you intend to run this kernel on a Dell Inspiron 8000.
Say Y if you intend to run this kernel on old Dell laptops or want to
use userspace package i8kutils.
Say N otherwise.
config X86_REBOOTFIXUPS

11
drivers/hwmon/Kconfig
View File

@ -371,6 +371,17 @@ config SENSORS_DS1621
This driver can also be built as a module. If so, the module
will be called ds1621.
config SENSORS_DELL_SMM
tristate "Dell laptop SMM BIOS hwmon driver"
depends on X86
help
This hwmon driver adds support for reporting temperature of different
sensors and controls the fans on Dell laptops via System Management
Mode provided by Dell BIOS.
When option I8K is also enabled this driver provides legacy /proc/i8k
userspace interface for i8kutils package.
config SENSORS_DA9052_ADC
tristate "Dialog DA9052/DA9053 ADC"
depends on PMIC_DA9052

2
drivers/hwmon/Makefile
View File

@ -49,6 +49,7 @@ obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o
obj-$(CONFIG_SENSORS_DELL_SMM) += dell-smm-hwmon.o
obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
obj-$(CONFIG_SENSORS_DS620) += ds620.o
obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
@ -156,7 +157,6 @@ obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o
obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
obj-$(CONFIG_I8K) += dell-smm-hwmon.o
obj-$(CONFIG_PMBUS) += pmbus/

150
drivers/hwmon/dell-smm-hwmon.c
View File

@ -81,7 +81,7 @@ static uint i8k_fan_max = I8K_FAN_HIGH;
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("i8k");
@ -93,6 +93,7 @@ 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;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
@ -100,6 +101,7 @@ MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
static bool power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
#endif
static uint fan_mult;
module_param(fan_mult, uint, 0);
@ -109,18 +111,6 @@ static uint fan_max;
module_param(fan_max, uint, 0);
MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
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,
};
struct smm_regs {
unsigned int eax;
unsigned int ebx __packed;
@ -220,45 +210,6 @@ static int i8k_smm(struct smm_regs *regs)
return rc;
}
/*
* 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;
}
}
/*
* 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;
}
/*
* Read the fan status.
*/
@ -378,6 +329,51 @@ static int i8k_get_dell_signature(int req_fn)
return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
}
#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;
}
}
/*
* 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;
}
/*
* Procfs interface
*/
static int
i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
{
@ -528,6 +524,37 @@ static int i8k_open_fs(struct inode *inode, struct file *file)
return single_open(file, i8k_proc_show, NULL);
}
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);
}
static void __exit i8k_exit_procfs(void)
{
remove_proc_entry("i8k", NULL);
}
#else
static inline void __init i8k_init_procfs(void)
{
}
static inline void __exit i8k_exit_procfs(void)
{
}
#endif
/*
* Hwmon interface
@ -750,8 +777,8 @@ static int __init i8k_init_hwmon(void)
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL,
i8k_groups);
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;
@ -976,33 +1003,24 @@ 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())
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 err;
i8k_init_procfs();
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);
i8k_exit_procfs();
}
module_init(i8k_init);