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Date: Sat, 28 Mar 2015 07:23:15 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Pali Rohár <pali.rohar@...il.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jean Delvare <jdelvare@...e.de>
CC: Steven Honeyman <stevenhoneyman@...il.com>,
Valdis.Kletnieks@...edu,
Jochen Eisinger <jochen@...guin-breeder.org>,
Gabriele Mazzotta <gabriele.mzt@...il.com>,
linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [PATCH 2/2] hwmon: Allow to compile dell-smm-hwmon driver without
/proc/i8k
On 03/28/2015 03:24 AM, Pali Rohár wrote:
> 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@...il.com>
> ---
> arch/x86/Kconfig | 25 +++++++++----------------
> drivers/hwmon/Kconfig | 11 +++++++++++
> drivers/hwmon/Makefile | 2 +-
> drivers/hwmon/dell-smm-hwmon.c | 20 ++++++++++++++++----
> 4 files changed, 37 insertions(+), 21 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index b7d31ca..8d0266b 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1063,24 +1063,17 @@ config TOSHIBA
> Say N otherwise.
>
> config I8K
> - tristate "Dell laptop support"
> - select HWMON
> + bool "Dell i8k legacy laptop support"
tristate and still "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 options enables legacy /proc/i8k userspace interface in
> + dell-smm-hwmon driver. Character file /proc/i8k reports power and
> + hotkey status on old Dell laptops (like Dell Inspiron 8000) via
> + System Management Mode provided by Dell BIOS. This /proc/i8k interface
> + is also used by userspace package i8kutils to control laptop fans.
>
> - 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
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 110fade..86eeb7d 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1703,6 +1703,17 @@ config SENSORS_ULTRA45
> This driver provides support for the Ultra45 workstation environmental
> sensors.
>
> +config SENSORS_DELL_SMM
> + tristate "Dell laptop SMM BIOS hwmon driver"
> + depends ON X86
Wondering as well .. .did you test this ?
> + ---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.
> +
Please add this in alphabetic order.
> if ACPI
>
> comment "ACPI drivers"
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 1c3e458..9eec614 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -155,7 +155,7 @@ 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_SENSORS_DELL_SMM) += dell-smm-hwmon.o
Same here.
>
> obj-$(CONFIG_PMBUS) += pmbus/
>
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index 2b04e4f..e9661dc 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -81,7 +81,7 @@ static uint i8k_fan_max = I8K_FAN_HIGH;
>
> MODULE_AUTHOR("Massimo Dal Zotto (dz@...ian.org)");
> MODULE_AUTHOR("Pali Rohár <pali.rohar@...il.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");
>
> +#ifdef 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);
> @@ -109,6 +111,7 @@ static uint fan_max;
> module_param(fan_max, uint, 0);
> MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
>
> +#ifdef CONFIG_I8K
> static int i8k_open_fs(struct inode *inode, struct file *file);
> static long i8k_ioctl(struct file *, unsigned int, unsigned long);
>
> @@ -120,6 +123,7 @@ static const struct file_operations i8k_fops = {
> .release = single_release,
> .unlocked_ioctl = i8k_ioctl,
> };
> +#endif
>
> struct smm_regs {
> unsigned int eax;
> @@ -220,6 +224,7 @@ out:
> return rc;
> }
>
> +#ifdef CONFIG_I8K
> /*
> * Read the Fn key status.
> */
> @@ -258,6 +263,7 @@ static int i8k_get_power_status(void)
>
> return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
> }
> +#endif
>
> /*
> * Read the fan status.
> @@ -378,6 +384,7 @@ static int i8k_get_dell_signature(int req_fn)
> return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
> }
>
> +#ifdef CONFIG_I8K
> static int
> i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
> {
> @@ -525,6 +532,7 @@ static int i8k_open_fs(struct inode *inode, struct file *file)
> {
> return single_open(file, i8k_proc_show, NULL);
> }
> +#endif
>
>
> /*
> @@ -974,17 +982,17 @@ 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;
>
> +#ifdef CONFIG_I8K
> /* Register the proc entry */
> - proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
> - if (!proc_i8k)
> + if (!proc_create("i8k", 0, NULL, &i8k_fops))
> return -ENOENT;
I would prefer not to fail here but report a warning.
This is no longer a fatal condition.
> +#endif
>
> err = i8k_init_hwmon();
> if (err)
> @@ -993,14 +1001,18 @@ static int __init i8k_init(void)
> return 0;
>
> exit_remove_proc:
> +#ifdef CONFIG_I8K
> remove_proc_entry("i8k", NULL);
> +#endif
> return err;
> }
>
> static void __exit i8k_exit(void)
> {
> hwmon_device_unregister(i8k_hwmon_dev);
> +#ifdef CONFIG_I8K
> remove_proc_entry("i8k", NULL);
> +#endif
> }
>
> module_init(i8k_init);
>
Can you move all the conditional functions and global variables together
under a single #ifdef ? That should include functions to create the proc
entries, and shim functions for the same if I8K is not configured.
Also, the #ifdef would not cover the case where I8K is configured as module
(there is no reason to force it to bool). You should use "#if IS_ENABLED(CONFIG_I8K)"
instead.
Thanks,
Guenter
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