acpipwr.h File Reference

ACPI power off. More...

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
int	acpi_poweroff (void)
	Power off the computer using ACPI.

Detailed Description

ACPI power off.

Definition in file acpipwr.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

acpi_poweroff()

int acpi_poweroff ( void )

extern

Power off the computer using ACPI.

Return values

rc	Return status code

Definition at line 115 of file acpipwr.c.

                           {
        const struct acpi_fadt *fadt;
        unsigned int pm1a_cnt_blk;
        unsigned int pm1b_cnt_blk;
        unsigned int pm1a_cnt;
        unsigned int pm1b_cnt;
        unsigned int slp_typa;
        unsigned int slp_typb;
        unsigned int s5;
        int rc;
 
        /* Locate FADT */
        fadt = container_of ( acpi_table ( FADT_SIGNATURE, 0 ),
                              struct acpi_fadt, acpi );
        if ( ! fadt ) {
                DBGC ( colour, "ACPI could not find FADT\n" );
                return -ENOENT;
        }
 
        /* Read FADT */
        pm1a_cnt_blk = le32_to_cpu ( fadt->pm1a_cnt_blk );
        pm1b_cnt_blk = le32_to_cpu ( fadt->pm1b_cnt_blk );
        pm1a_cnt = ( pm1a_cnt_blk + ACPI_PM1_CNT );
        pm1b_cnt = ( pm1b_cnt_blk + ACPI_PM1_CNT );
 
        /* Extract \_S5 from DSDT or any SSDT */
        if ( ( rc = acpi_extract ( S5_SIGNATURE, &s5,
                                   acpi_extract_sx ) ) != 0 ) {
                DBGC ( colour, "ACPI could not extract \\_S5: %s\n",
                       strerror ( rc ) );
                return rc;
        }
 
        /* Power off system */
        if ( pm1a_cnt_blk ) {
                slp_typa = ( ( s5 >> 0 ) & 0xff );
                DBGC ( colour, "ACPI PM1a sleep type %#x => %04x\n",
                       slp_typa, pm1a_cnt );
                outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typa ) |
                         ACPI_PM1_CNT_SLP_EN ), pm1a_cnt );
        }
        if ( pm1b_cnt_blk ) {
                slp_typb = ( ( s5 >> 8 ) & 0xff );
                DBGC ( colour, "ACPI PM1b sleep type %#x => %04x\n",
                       slp_typb, pm1b_cnt );
                outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typb ) |
                         ACPI_PM1_CNT_SLP_EN ), pm1b_cnt );
        }
 
        /* On some systems, execution will continue briefly.  Delay to
         * avoid potentially confusing log messages.
         */
        mdelay ( 1000 );
 
        DBGC ( colour, "ACPI power off failed\n" );
        return -EPROTO;
}

References acpi, acpi_extract(), acpi_extract_sx(), ACPI_PM1_CNT, ACPI_PM1_CNT_SLP_EN, ACPI_PM1_CNT_SLP_TYP, acpi_table(), colour, container_of, DBGC, ENOENT, EPROTO, FADT_SIGNATURE, le32_to_cpu, mdelay(), outw, acpi_fadt::pm1a_cnt_blk, acpi_fadt::pm1b_cnt_blk, rc, S5_SIGNATURE, and strerror().

Referenced by bios_poweroff().