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Functions
acpipwr.h File Reference

ACPI power off. More...

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Functions

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

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  )

Power off the computer using ACPI.

Return values
rcReturn status code

Definition at line 115 of file acpipwr.c.

115  {
116  const struct acpi_fadt *fadt;
117  unsigned int pm1a_cnt_blk;
118  unsigned int pm1b_cnt_blk;
119  unsigned int pm1a_cnt;
120  unsigned int pm1b_cnt;
121  unsigned int slp_typa;
122  unsigned int slp_typb;
123  unsigned int s5;
124  int rc;
125 
126  /* Locate FADT */
127  fadt = container_of ( acpi_table ( FADT_SIGNATURE, 0 ),
128  struct acpi_fadt, acpi );
129  if ( ! fadt ) {
130  DBGC ( colour, "ACPI could not find FADT\n" );
131  return -ENOENT;
132  }
133 
134  /* Read FADT */
135  pm1a_cnt_blk = le32_to_cpu ( fadt->pm1a_cnt_blk );
136  pm1b_cnt_blk = le32_to_cpu ( fadt->pm1b_cnt_blk );
137  pm1a_cnt = ( pm1a_cnt_blk + ACPI_PM1_CNT );
138  pm1b_cnt = ( pm1b_cnt_blk + ACPI_PM1_CNT );
139 
140  /* Extract \_S5 from DSDT or any SSDT */
141  if ( ( rc = acpi_extract ( S5_SIGNATURE, &s5,
142  acpi_extract_sx ) ) != 0 ) {
143  DBGC ( colour, "ACPI could not extract \\_S5: %s\n",
144  strerror ( rc ) );
145  return rc;
146  }
147 
148  /* Power off system */
149  if ( pm1a_cnt_blk ) {
150  slp_typa = ( ( s5 >> 0 ) & 0xff );
151  DBGC ( colour, "ACPI PM1a sleep type %#x => %04x\n",
152  slp_typa, pm1a_cnt );
153  outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typa ) |
154  ACPI_PM1_CNT_SLP_EN ), pm1a_cnt );
155  }
156  if ( pm1b_cnt_blk ) {
157  slp_typb = ( ( s5 >> 8 ) & 0xff );
158  DBGC ( colour, "ACPI PM1b sleep type %#x => %04x\n",
159  slp_typb, pm1b_cnt );
160  outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typb ) |
161  ACPI_PM1_CNT_SLP_EN ), pm1b_cnt );
162  }
163 
164  /* On some systems, execution will continue briefly. Delay to
165  * avoid potentially confusing log messages.
166  */
167  mdelay ( 1000 );
168 
169  DBGC ( colour, "ACPI power off failed\n" );
170  return -EPROTO;
171 }
rc
struct arbelprm_rc_send_wqe rc
Definition: arbel.h:14
le32_to_cpu
#define le32_to_cpu(value)
Definition: byteswap.h:113
outw
#define outw(data, io_addr)
Definition: io.h:319
ACPI_PM1_CNT
#define ACPI_PM1_CNT
ACPI PM1 Control Register (within PM1a_CNT_BLK or PM1A_CNT_BLK)
Definition: acpi.h:280
DBGC
#define DBGC(...)
Definition: compiler.h:505
ENOENT
#define ENOENT
No such file or directory.
Definition: errno.h:514
acpi_table
const struct acpi_header * acpi_table(uint32_t signature, unsigned int index)
Locate ACPI table.
Definition: acpi.c:92
colour
#define colour
Colour for debug messages.
Definition: acpipwr.c:41
container_of
#define container_of(ptr, type, field)
Get containing structure.
Definition: stddef.h:35
acpi_fadt
Fixed ACPI Description Table (FADT)
Definition: acpi.h:260
acpi
static EFI_ACPI_TABLE_PROTOCOL * acpi
ACPI table protocol protocol.
Definition: efi_block.c:66
FADT_SIGNATURE
#define FADT_SIGNATURE
Fixed ACPI Description Table (FADT) signature.
Definition: acpi.h:257
acpi_fadt::pm1a_cnt_blk
uint32_t pm1a_cnt_blk
PM1a Control Register Block.
Definition: acpi.h:270
ACPI_PM1_CNT_SLP_EN
#define ACPI_PM1_CNT_SLP_EN
Sleep enable.
Definition: acpi.h:282
EPROTO
#define EPROTO
Protocol error.
Definition: errno.h:624
strerror
char * strerror(int errno)
Retrieve string representation of error number.
Definition: strerror.c:78
mdelay
void mdelay(unsigned long msecs)
Delay for a fixed number of milliseconds.
Definition: timer.c:78
acpi_extract_sx
static int acpi_extract_sx(const struct acpi_header *zsdt, size_t len, size_t offset, void *data)
Extract _Sx value from DSDT/SSDT.
Definition: acpipwr.c:66
ACPI_PM1_CNT_SLP_TYP
#define ACPI_PM1_CNT_SLP_TYP(x)
Sleep type.
Definition: acpi.h:281
acpi_fadt::pm1b_cnt_blk
uint32_t pm1b_cnt_blk
PM1b Control Register Block.
Definition: acpi.h:272
S5_SIGNATURE
#define S5_SIGNATURE
S5 signature
Definition: acpipwr.c:44
acpi_extract
int acpi_extract(uint32_t signature, void *data, int(*extract)(const struct acpi_header *zsdt, size_t len, size_t offset, void *data))
Extract value from DSDT/SSDT.
Definition: acpi.c:227

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().

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