diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/Kconfig | 20 | ||||
| -rw-r--r-- | drivers/acpi/osl.c | 2 | ||||
| -rw-r--r-- | drivers/acpi/processor_perflib.c | 7 |
3 files changed, 24 insertions, 5 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 7ef172c2a1d6..f688c214be0c 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -204,13 +204,25 @@ config ACPI_NUMA config ACPI_WMI tristate "WMI (EXPERIMENTAL)" + depends on X86 depends on EXPERIMENTAL help - This driver adds support for the ACPI-WMI mapper device (PNP0C14) - found on some systems. + This driver adds support for the ACPI-WMI (Windows Management + Instrumentation) mapper device (PNP0C14) found on some systems. + + ACPI-WMI is a proprietary extension to ACPI to expose parts of the + ACPI firmware to userspace - this is done through various vendor + defined methods and data blocks in a PNP0C14 device, which are then + made available for userspace to call. + + The implementation of this in Linux currently only exposes this to + other kernel space drivers. + + This driver is a required dependency to build the firmware specific + drivers needed on many machines, including Acer and HP laptops. - NOTE: You will need another driver or userspace application on top of - this to actually use anything defined in the ACPI-WMI mapper. + It is safe to enable this driver even if your DSDT doesn't define + any ACPI-WMI devices. config ACPI_ASUS tristate "ASUS/Medion Laptop Extras" diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 27ccd68b8f46..a14501c98f40 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -343,7 +343,7 @@ struct acpi_table_header *acpi_find_dsdt_initrd(void) struct kstat stat; char *ramfs_dsdt_name = "/DSDT.aml"; - printk(KERN_INFO PREFIX "Checking initramfs for custom DSDT"); + printk(KERN_INFO PREFIX "Checking initramfs for custom DSDT\n"); /* * Never do this at home, only the user-space is allowed to open a file. diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c index f32010bee4d5..b477a4be8a69 100644 --- a/drivers/acpi/processor_perflib.c +++ b/drivers/acpi/processor_perflib.c @@ -50,6 +50,10 @@ ACPI_MODULE_NAME("processor_perflib"); static DEFINE_MUTEX(performance_mutex); +/* Use cpufreq debug layer for _PPC changes. */ +#define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \ + "cpufreq-core", msg) + /* * _PPC support is implemented as a CPUfreq policy notifier: * This means each time a CPUfreq driver registered also with @@ -131,6 +135,9 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) return -ENODEV; } + cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, + (int)ppc, ppc ? "" : "not"); + pr->performance_platform_limit = (int)ppc; return 0; |