PM: Optional beeping during resume from suspend to RAM

Add a feature allowing the user to make the system beep during a resume from
suspend to RAM, on x86_64 and i386.

This is useful for the users with broken resume from RAM, so that they can
verify if the control reaches the kernel after a wake-up event.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/i386/kernel/acpi/wakeup.S b/arch/i386/kernel/acpi/wakeup.S
index a2295a3..b4e2ec3 100644 (file)
--- a/arch/i386/kernel/acpi/wakeup.S
+++ b/arch/i386/kernel/acpi/wakeup.S
@@ -13,6 +13,21 @@
 # cs = 0x1234, eip = 0x05
 # 
 
+#define BEEP \
+       inb     $97, %al;       \
+       outb    %al, $0x80;     \
+       movb    $3, %al;        \
+       outb    %al, $97;       \
+       outb    %al, $0x80;     \
+       movb    $-74, %al;      \
+       outb    %al, $67;       \
+       outb    %al, $0x80;     \
+       movb    $-119, %al;     \
+       outb    %al, $66;       \
+       outb    %al, $0x80;     \
+       movb    $15, %al;       \
+       outb    %al, $66;
+
 ALIGN
        .align  4096
 ENTRY(wakeup_start)
@@ -31,6 +46,11 @@ wakeup_code:
        movw    %cs, %ax
        movw    %ax, %ds                                        # Make ds:0 point to wakeup_start
        movw    %ax, %ss
+
+       testl   $1, beep_flags - wakeup_code
+       jz      1f
+       BEEP
+1:
        mov     $(wakeup_stack - wakeup_code), %sp              # Private stack is needed for ASUS board
        movw    $0x0e00 + 'S', %fs:(0x12)
 
@@ -88,6 +108,10 @@ wakeup_code:
        cmpl    $0x12345678, %eax
        jne     bogus_real_magic
 
+       testl   $2, beep_flags - wakeup_code
+       jz      1f
+       BEEP
+1:
        ljmpl   $__KERNEL_CS,$wakeup_pmode_return
 
 real_save_gdt: .word 0
@@ -98,6 +122,7 @@ real_save_cr4:       .long 0
 real_magic:    .long 0
 video_mode:    .long 0
 video_flags:   .long 0
+beep_flags:    .long 0
 real_efer_save_restore:        .long 0
 real_save_efer_edx:    .long 0
 real_save_efer_eax:    .long 0
@@ -262,6 +287,8 @@ ENTRY(acpi_copy_wakeup_routine)
        movl    %edx, video_mode - wakeup_start (%eax)
        movl    acpi_video_flags, %edx
        movl    %edx, video_flags - wakeup_start (%eax)
+       movl    s2ram_beep, %edx
+       movl    %edx, beep_flags - wakeup_start (%eax)
        movl    $0x12345678, real_magic - wakeup_start (%eax)
        movl    $0x12345678, saved_magic
        popl    %ebx

diff --git a/arch/x86_64/kernel/acpi/wakeup.S b/arch/x86_64/kernel/acpi/wakeup.S
index 8550a6f..ed63d18 100644 (file)
--- a/arch/x86_64/kernel/acpi/wakeup.S
+++ b/arch/x86_64/kernel/acpi/wakeup.S
@@ -16,6 +16,21 @@
 # cs = 0x1234, eip = 0x05
 #
 
+#define BEEP \
+       inb     $97, %al;       \
+       outb    %al, $0x80;     \
+       movb    $3, %al;        \
+       outb    %al, $97;       \
+       outb    %al, $0x80;     \
+       movb    $-74, %al;      \
+       outb    %al, $67;       \
+       outb    %al, $0x80;     \
+       movb    $-119, %al;     \
+       outb    %al, $66;       \
+       outb    %al, $0x80;     \
+       movb    $15, %al;       \
+       outb    %al, $66;
+
 
 ALIGN
        .align  16
@@ -33,6 +48,13 @@ wakeup_code:
        movw    %cs, %ax
        movw    %ax, %ds                # Make ds:0 point to wakeup_start
        movw    %ax, %ss
+
+       # Data segment must be set up before we can see whether to beep.
+       testl   $1, beep_flags - wakeup_code
+       jz      1f
+       BEEP
+1:
+
                                        # Private stack is needed for ASUS board
        mov     $(wakeup_stack - wakeup_code), %sp
 
@@ -229,6 +251,7 @@ gdt_48a:
        .long   gdta - wakeup_code              # gdt base (relocated in later)
        
 real_magic:    .quad 0
+beep_flags:    .quad 0
 video_mode:    .quad 0
 video_flags:   .quad 0
 
@@ -344,6 +367,8 @@ ENTRY(acpi_copy_wakeup_routine)
        pushq   %rax
        pushq   %rdx
 
+       movl    s2ram_beep, %edx
+       movl    %edx, beep_flags - wakeup_start (,%rdi)
        movl    saved_video_mode, %edx
        movl    %edx, video_mode - wakeup_start (,%rdi)
        movl    acpi_video_flags, %edx

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index fccd8b5..c0ccdd7 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -123,6 +123,7 @@ extern int pci_mmcfg_config_num;
 
 extern int sbf_port;
 extern unsigned long acpi_video_flags;
+extern unsigned long s2ram_beep;
 
 #else  /* !CONFIG_ACPI */
 

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 32147b5..c74a564 100644 (file)
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -332,6 +332,27 @@ static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
 
 power_attr(state);
 
+unsigned long s2ram_beep = 0;
+
+static ssize_t s2ram_beep_show(struct kset *kset, char *buf)
+{
+       return sprintf(buf, "%d\n", s2ram_beep);
+}
+
+static ssize_t
+s2ram_beep_store(struct kset *kset, const char *buf, size_t n)
+{
+       int val;
+
+       if (sscanf(buf, "%d", &val) > 0) {
+               s2ram_beep = val;
+               return n;
+       }
+       return -EINVAL;
+}
+
+power_attr(s2ram_beep);
+
 #ifdef CONFIG_PM_TRACE
 int pm_trace_enabled;
 
@@ -357,11 +378,13 @@ power_attr(pm_trace);
 static struct attribute * g[] = {
        &state_attr.attr,
        &pm_trace_attr.attr,
+       &s2ram_beep_attr.attr,
        NULL,
 };
 #else
 static struct attribute * g[] = {
        &state_attr.attr,
+       &s2ram_beep_attr.attr,
        NULL,
 };
 #endif /* CONFIG_PM_TRACE */