blob: 9f1710e35fb43ad444c3f1943eb140d7ce827d18 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <string.h>
#include <arch/acpi.h>
#include <arch/acpi_device.h>
#include <arch/acpigen.h>
#include <device/device.h>
#include <device/path.h>
#include <stdlib.h>
#include <crc_byte.h>
#if CONFIG(GENERIC_GPIO_LIB)
#include <gpio.h>
#endif
#define ACPI_DP_UUID "daffd814-6eba-4d8c-8a91-bc9bbf4aa301"
#define ACPI_DP_CHILD_UUID "dbb8e3e6-5886-4ba6-8795-1319f52a966b"
/* Write empty word value and return pointer to it */
static void *acpi_device_write_zero_len(void)
{
char *p = acpigen_get_current();
acpigen_emit_word(0);
return p;
}
/* Fill in length value from start to current at specified location */
static void acpi_device_fill_from_len(char *ptr, char *start)
{
uint16_t len = acpigen_get_current() - start;
ptr[0] = len & 0xff;
ptr[1] = (len >> 8) & 0xff;
}
/*
* Fill in the length field with the value calculated from after
* the 16bit field to acpigen current as this length value does
* not include the length field itself.
*/
static void acpi_device_fill_len(void *ptr)
{
acpi_device_fill_from_len(ptr, ptr + sizeof(uint16_t));
}
/* Locate and return the ACPI name for this device */
const char *acpi_device_name(const struct device *dev)
{
const struct device *pdev = dev;
const char *name = NULL;
if (!dev)
return NULL;
/* Check for device specific handler */
if (dev->ops->acpi_name)
return dev->ops->acpi_name(dev);
/* Walk up the tree to find if any parent can identify this device */
while (pdev->bus) {
pdev = pdev->bus->dev;
if (!pdev)
break;
if (pdev->path.type == DEVICE_PATH_ROOT)
break;
if (pdev->ops && pdev->ops->acpi_name)
name = pdev->ops->acpi_name(dev);
if (name)
return name;
}
return NULL;
}
/* Locate and return the ACPI _HID (Hardware ID) for this device */
const char *acpi_device_hid(const struct device *dev)
{
if (!dev)
return NULL;
/* Check for device specific handler */
if (dev->ops->acpi_hid)
return dev->ops->acpi_hid(dev);
/*
* Don't walk up the tree to find any parent that can identify this device, as
* PNP devices are hard to identify.
*/
return NULL;
}
/*
* Generate unique ID based on the ACPI path.
* Collisions on the same _HID are possible but very unlikely.
*/
uint32_t acpi_device_uid(struct device *dev)
{
const char *path = acpi_device_path(dev);
if (!path)
return 0;
return CRC(path, strlen(path), crc32_byte);
}
/* Recursive function to find the root device and print a path from there */
static ssize_t acpi_device_path_fill(const struct device *dev, char *buf,
size_t buf_len, size_t cur)
{
const char *name = acpi_device_name(dev);
ssize_t next = 0;
if (!name)
return -1;
/*
* Make sure this name segment will fit, including the path segment
* separator and possible NUL terminator if this is the last segment.
*/
if (!dev || (cur + strlen(name) + 2) > buf_len)
return cur;
/* Walk up the tree to the root device */
if (dev->path.type != DEVICE_PATH_ROOT && dev->bus && dev->bus->dev)
next = acpi_device_path_fill(dev->bus->dev, buf, buf_len, cur);
if (next < 0)
return next;
/* Fill in the path from the root device */
next += snprintf(buf + next, buf_len - next, "%s%s",
(dev->path.type == DEVICE_PATH_ROOT
|| (strlen(name) == 0)) ?
"" : ".", name);
return next;
}
/*
* Warning: just as with dev_path() this uses a static buffer
* so should not be called mulitple times in one statement
*/
const char *acpi_device_path(const struct device *dev)
{
static char buf[DEVICE_PATH_MAX] = {};
if (!dev)
return NULL;
if (acpi_device_path_fill(dev, buf, sizeof(buf), 0) <= 0)
return NULL;
return buf;
}
/* Return the path of the parent device as the ACPI Scope for this device */
const char *acpi_device_scope(const struct device *dev)
{
static char buf[DEVICE_PATH_MAX] = {};
if (!dev || !dev->bus || !dev->bus->dev)
return NULL;
if (acpi_device_path_fill(dev->bus->dev, buf, sizeof(buf), 0) <= 0)
return NULL;
return buf;
}
/* Concatenate the device path and provided name suffix */
const char *acpi_device_path_join(const struct device *dev, const char *name)
{
static char buf[DEVICE_PATH_MAX] = {};
ssize_t len;
if (!dev)
return NULL;
/* Build the path of this device */
len = acpi_device_path_fill(dev, buf, sizeof(buf), 0);
if (len <= 0)
return NULL;
/* Ensure there is room for the added name, separator, and NUL */
if ((len + strlen(name) + 2) > sizeof(buf))
return NULL;
snprintf(buf + len, sizeof(buf) - len, ".%s", name);
return buf;
}
int acpi_device_status(const struct device *dev)
{
if (!dev->enabled)
return ACPI_STATUS_DEVICE_ALL_OFF;
if (dev->hidden)
return ACPI_STATUS_DEVICE_HIDDEN_ON;
return ACPI_STATUS_DEVICE_ALL_ON;
}
/* Write the unique _UID based on ACPI device path. */
void acpi_device_write_uid(struct device *dev)
{
acpigen_write_name_integer("_UID", acpi_device_uid(dev));
}
/* ACPI 6.1 section 6.4.3.6: Extended Interrupt Descriptor */
void acpi_device_write_interrupt(const struct acpi_irq *irq)
{
void *desc_length;
uint8_t flags;
if (!irq || !irq->pin)
return;
/* This is supported by GpioInt() but not Interrupt() */
if (irq->polarity == ACPI_IRQ_ACTIVE_BOTH)
return;
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ACPI_DESCRIPTOR_INTERRUPT);
/* Byte 1-2: Length (filled in later) */
desc_length = acpi_device_write_zero_len();
/*
* Byte 3: Flags
* [7:5]: Reserved
* [4]: Wake (0=NO_WAKE 1=WAKE)
* [3]: Sharing (0=EXCLUSIVE 1=SHARED)
* [2]: Polarity (0=HIGH 1=LOW)
* [1]: Mode (0=LEVEL 1=EDGE)
* [0]: Resource (0=PRODUCER 1=CONSUMER)
*/
flags = 1 << 0; /* ResourceConsumer */
if (irq->mode == ACPI_IRQ_EDGE_TRIGGERED)
flags |= 1 << 1;
if (irq->polarity == ACPI_IRQ_ACTIVE_LOW)
flags |= 1 << 2;
if (irq->shared == ACPI_IRQ_SHARED)
flags |= 1 << 3;
if (irq->wake == ACPI_IRQ_WAKE)
flags |= 1 << 4;
acpigen_emit_byte(flags);
/* Byte 4: Interrupt Table Entry Count */
acpigen_emit_byte(1);
/* Byte 5-8: Interrupt Number */
acpigen_emit_dword(irq->pin);
/* Fill in Descriptor Length (account for len word) */
acpi_device_fill_len(desc_length);
}
/* ACPI 6.1 section 6.4.3.8.1 - GPIO Interrupt or I/O */
void acpi_device_write_gpio(const struct acpi_gpio *gpio)
{
void *start, *desc_length;
void *pin_table_offset, *vendor_data_offset, *resource_offset;
uint16_t flags = 0;
int pin;
if (!gpio || gpio->type > ACPI_GPIO_TYPE_IO)
return;
start = acpigen_get_current();
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ACPI_DESCRIPTOR_GPIO);
/* Byte 1-2: Length (fill in later) */
desc_length = acpi_device_write_zero_len();
/* Byte 3: Revision ID */
acpigen_emit_byte(ACPI_GPIO_REVISION_ID);
/* Byte 4: GpioIo or GpioInt */
acpigen_emit_byte(gpio->type);
/*
* Byte 5-6: General Flags
* [15:1]: 0 => Reserved
* [0]: 1 => ResourceConsumer
*/
acpigen_emit_word(1 << 0);
switch (gpio->type) {
case ACPI_GPIO_TYPE_INTERRUPT:
/*
* Byte 7-8: GPIO Interrupt Flags
* [15:5]: 0 => Reserved
* [4]: Wake (0=NO_WAKE 1=WAKE)
* [3]: Sharing (0=EXCLUSIVE 1=SHARED)
* [2:1]: Polarity (0=HIGH 1=LOW 2=BOTH)
* [0]: Mode (0=LEVEL 1=EDGE)
*/
if (gpio->irq.mode == ACPI_IRQ_EDGE_TRIGGERED)
flags |= 1 << 0;
if (gpio->irq.shared == ACPI_IRQ_SHARED)
flags |= 1 << 3;
if (gpio->irq.wake == ACPI_IRQ_WAKE)
flags |= 1 << 4;
switch (gpio->irq.polarity) {
case ACPI_IRQ_ACTIVE_HIGH:
flags |= 0 << 1;
break;
case ACPI_IRQ_ACTIVE_LOW:
flags |= 1 << 1;
break;
case ACPI_IRQ_ACTIVE_BOTH:
flags |= 2 << 1;
break;
}
break;
case ACPI_GPIO_TYPE_IO:
/*
* Byte 7-8: GPIO IO Flags
* [15:4]: 0 => Reserved
* [3]: Sharing (0=EXCLUSIVE 1=SHARED)
* [2]: 0 => Reserved
* [1:0]: IO Restriction
* 0 => IoRestrictionNone
* 1 => IoRestrictionInputOnly
* 2 => IoRestrictionOutputOnly
* 3 => IoRestrictionNoneAndPreserve
*/
flags |= gpio->io_restrict & 3;
if (gpio->io_shared)
flags |= 1 << 3;
break;
}
acpigen_emit_word(flags);
/*
* Byte 9: Pin Configuration
* 0x01 => Default (no configuration applied)
* 0x02 => Pull-up
* 0x03 => Pull-down
* 0x04-0x7F => Reserved
* 0x80-0xff => Vendor defined
*/
acpigen_emit_byte(gpio->pull);
/* Byte 10-11: Output Drive Strength in 1/100 mA */
acpigen_emit_word(gpio->output_drive_strength);
/* Byte 12-13: Debounce Timeout in 1/100 ms */
acpigen_emit_word(gpio->interrupt_debounce_timeout);
/* Byte 14-15: Pin Table Offset, relative to start */
pin_table_offset = acpi_device_write_zero_len();
/* Byte 16: Reserved */
acpigen_emit_byte(0);
/* Byte 17-18: Resource Source Name Offset, relative to start */
resource_offset = acpi_device_write_zero_len();
/* Byte 19-20: Vendor Data Offset, relative to start */
vendor_data_offset = acpi_device_write_zero_len();
/* Byte 21-22: Vendor Data Length */
acpigen_emit_word(0);
/* Fill in Pin Table Offset */
acpi_device_fill_from_len(pin_table_offset, start);
/* Pin Table, one word for each pin */
for (pin = 0; pin < gpio->pin_count; pin++) {
uint16_t acpi_pin = gpio->pins[pin];
#if CONFIG(GENERIC_GPIO_LIB)
acpi_pin = gpio_acpi_pin(acpi_pin);
#endif
acpigen_emit_word(acpi_pin);
}
/* Fill in Resource Source Name Offset */
acpi_device_fill_from_len(resource_offset, start);
/* Resource Source Name String */
#if CONFIG(GENERIC_GPIO_LIB)
acpigen_emit_string(gpio->resource ? : gpio_acpi_path(gpio->pins[0]));
#else
acpigen_emit_string(gpio->resource);
#endif
/* Fill in Vendor Data Offset */
acpi_device_fill_from_len(vendor_data_offset, start);
/* Fill in GPIO Descriptor Length (account for len word) */
acpi_device_fill_len(desc_length);
}
/* ACPI 6.1 section 6.4.3.8.2.1 - I2cSerialBus() */
void acpi_device_write_i2c(const struct acpi_i2c *i2c)
{
void *desc_length, *type_length;
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ACPI_DESCRIPTOR_SERIAL_BUS);
/* Byte 1+2: Length (filled in later) */
desc_length = acpi_device_write_zero_len();
/* Byte 3: Revision ID */
acpigen_emit_byte(ACPI_I2C_SERIAL_BUS_REVISION_ID);
/* Byte 4: Resource Source Index is Reserved */
acpigen_emit_byte(0);
/* Byte 5: Serial Bus Type is I2C */
acpigen_emit_byte(ACPI_SERIAL_BUS_TYPE_I2C);
/*
* Byte 6: Flags
* [7:2]: 0 => Reserved
* [1]: 1 => ResourceConsumer
* [0]: 0 => ControllerInitiated
*/
acpigen_emit_byte(1 << 1);
/*
* Byte 7-8: Type Specific Flags
* [15:1]: 0 => Reserved
* [0]: 0 => 7bit, 1 => 10bit
*/
acpigen_emit_word(i2c->mode_10bit);
/* Byte 9: Type Specific Revision ID */
acpigen_emit_byte(ACPI_I2C_TYPE_SPECIFIC_REVISION_ID);
/* Byte 10-11: I2C Type Data Length */
type_length = acpi_device_write_zero_len();
/* Byte 12-15: I2C Bus Speed */
acpigen_emit_dword(i2c->speed);
/* Byte 16-17: I2C Slave Address */
acpigen_emit_word(i2c->address);
/* Fill in Type Data Length */
acpi_device_fill_len(type_length);
/* Byte 18+: ResourceSource */
acpigen_emit_string(i2c->resource);
/* Fill in I2C Descriptor Length */
acpi_device_fill_len(desc_length);
}
/* ACPI 6.1 section 6.4.3.8.2.2 - SpiSerialBus() */
void acpi_device_write_spi(const struct acpi_spi *spi)
{
void *desc_length, *type_length;
uint16_t flags = 0;
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ACPI_DESCRIPTOR_SERIAL_BUS);
/* Byte 1+2: Length (filled in later) */
desc_length = acpi_device_write_zero_len();
/* Byte 3: Revision ID */
acpigen_emit_byte(ACPI_SPI_SERIAL_BUS_REVISION_ID);
/* Byte 4: Resource Source Index is Reserved */
acpigen_emit_byte(0);
/* Byte 5: Serial Bus Type is SPI */
acpigen_emit_byte(ACPI_SERIAL_BUS_TYPE_SPI);
/*
* Byte 6: Flags
* [7:2]: 0 => Reserved
* [1]: 1 => ResourceConsumer
* [0]: 0 => ControllerInitiated
*/
acpigen_emit_byte(1 << 1);
/*
* Byte 7-8: Type Specific Flags
* [15:2]: 0 => Reserved
* [1]: 0 => ActiveLow, 1 => ActiveHigh
* [0]: 0 => FourWire, 1 => ThreeWire
*/
if (spi->wire_mode == SPI_3_WIRE_MODE)
flags |= 1 << 0;
if (spi->device_select_polarity == SPI_POLARITY_HIGH)
flags |= 1 << 1;
acpigen_emit_word(flags);
/* Byte 9: Type Specific Revision ID */
acpigen_emit_byte(ACPI_SPI_TYPE_SPECIFIC_REVISION_ID);
/* Byte 10-11: SPI Type Data Length */
type_length = acpi_device_write_zero_len();
/* Byte 12-15: Connection Speed */
acpigen_emit_dword(spi->speed);
/* Byte 16: Data Bit Length */
acpigen_emit_byte(spi->data_bit_length);
/* Byte 17: Clock Phase */
acpigen_emit_byte(spi->clock_phase);
/* Byte 18: Clock Polarity */
acpigen_emit_byte(spi->clock_polarity);
/* Byte 19-20: Device Selection */
acpigen_emit_word(spi->device_select);
/* Fill in Type Data Length */
acpi_device_fill_len(type_length);
/* Byte 21+: ResourceSource String */
acpigen_emit_string(spi->resource);
/* Fill in SPI Descriptor Length */
acpi_device_fill_len(desc_length);
}
/* PowerResource() with Enable and/or Reset control */
void acpi_device_add_power_res(const struct acpi_power_res_params *params)
{
static const char *power_res_dev_states[] = { "_PR0", "_PR3" };
unsigned int reset_gpio = params->reset_gpio ? params->reset_gpio->pins[0] : 0;
unsigned int enable_gpio = params->enable_gpio ? params->enable_gpio->pins[0] : 0;
unsigned int stop_gpio = params->stop_gpio ? params->stop_gpio->pins[0] : 0;
if (!reset_gpio && !enable_gpio && !stop_gpio)
return;
/* PowerResource (PRIC, 0, 0) */
acpigen_write_power_res("PRIC", 0, 0, power_res_dev_states,
ARRAY_SIZE(power_res_dev_states));
/* Method (_STA, 0, NotSerialized) { Return (0x1) } */
acpigen_write_STA(0x1);
/* Method (_ON, 0, Serialized) */
acpigen_write_method_serialized("_ON", 0);
if (reset_gpio)
acpigen_enable_tx_gpio(params->reset_gpio);
if (enable_gpio) {
acpigen_enable_tx_gpio(params->enable_gpio);
if (params->enable_delay_ms)
acpigen_write_sleep(params->enable_delay_ms);
}
if (reset_gpio) {
acpigen_disable_tx_gpio(params->reset_gpio);
if (params->reset_delay_ms)
acpigen_write_sleep(params->reset_delay_ms);
}
if (stop_gpio) {
acpigen_disable_tx_gpio(params->stop_gpio);
if (params->stop_delay_ms)
acpigen_write_sleep(params->stop_delay_ms);
}
acpigen_pop_len(); /* _ON method */
/* Method (_OFF, 0, Serialized) */
acpigen_write_method_serialized("_OFF", 0);
if (stop_gpio) {
acpigen_enable_tx_gpio(params->stop_gpio);
if (params->stop_off_delay_ms)
acpigen_write_sleep(params->stop_off_delay_ms);
}
if (reset_gpio) {
acpigen_enable_tx_gpio(params->reset_gpio);
if (params->reset_off_delay_ms)
acpigen_write_sleep(params->reset_off_delay_ms);
}
if (enable_gpio) {
acpigen_disable_tx_gpio(params->enable_gpio);
if (params->enable_off_delay_ms)
acpigen_write_sleep(params->enable_off_delay_ms);
}
acpigen_pop_len(); /* _OFF method */
acpigen_pop_len(); /* PowerResource PRIC */
}
static void acpi_dp_write_array(const struct acpi_dp *array);
static void acpi_dp_write_value(const struct acpi_dp *prop)
{
switch (prop->type) {
case ACPI_DP_TYPE_INTEGER:
acpigen_write_integer(prop->integer);
break;
case ACPI_DP_TYPE_STRING:
case ACPI_DP_TYPE_CHILD:
acpigen_write_string(prop->string);
break;
case ACPI_DP_TYPE_REFERENCE:
acpigen_emit_namestring(prop->string);
break;
case ACPI_DP_TYPE_ARRAY:
acpi_dp_write_array(prop->array);
break;
default:
break;
}
}
/* Package (2) { "prop->name", VALUE } */
static void acpi_dp_write_property(const struct acpi_dp *prop)
{
acpigen_write_package(2);
acpigen_write_string(prop->name);
acpi_dp_write_value(prop);
acpigen_pop_len();
}
/* Write array of Device Properties */
static void acpi_dp_write_array(const struct acpi_dp *array)
{
const struct acpi_dp *dp;
char *pkg_count;
/* Package element count determined as it is populated */
pkg_count = acpigen_write_package(0);
/*
* Only acpi_dp of type DP_TYPE_TABLE is allowed to be an array.
* DP_TYPE_TABLE does not have a value to be written. Thus, start
* the loop from next type in the array.
*/
for (dp = array->next; dp; dp = dp->next) {
acpi_dp_write_value(dp);
(*pkg_count)++;
}
acpigen_pop_len();
}
static void acpi_dp_free(struct acpi_dp *dp)
{
while (dp) {
struct acpi_dp *p = dp->next;
switch (dp->type) {
case ACPI_DP_TYPE_CHILD:
acpi_dp_free(dp->child);
break;
case ACPI_DP_TYPE_ARRAY:
acpi_dp_free(dp->array);
break;
default:
break;
}
free(dp);
dp = p;
}
}
void acpi_dp_write(struct acpi_dp *table)
{
struct acpi_dp *dp, *prop;
char *dp_count, *prop_count = NULL;
int child_count = 0;
if (!table || table->type != ACPI_DP_TYPE_TABLE)
return;
/* Name (name) */
acpigen_write_name(table->name);
/* Device Property list starts with the next entry */
prop = table->next;
/* Package (DP), default to assuming no properties or children */
dp_count = acpigen_write_package(0);
/* Print base properties */
for (dp = prop; dp; dp = dp->next) {
if (dp->type == ACPI_DP_TYPE_CHILD) {
child_count++;
} else {
/*
* The UUID and package is only added when
* we come across the first property. This
* is to avoid creating a zero-length package
* in situations where there are only children.
*/
if (!prop_count) {
*dp_count += 2;
/* ToUUID (ACPI_DP_UUID) */
acpigen_write_uuid(ACPI_DP_UUID);
/*
* Package (PROP), element count determined as
* it is populated
*/
prop_count = acpigen_write_package(0);
}
(*prop_count)++;
acpi_dp_write_property(dp);
}
}
if (prop_count) {
/* Package (PROP) length, if a package was written */
acpigen_pop_len();
}
if (child_count) {
/* Update DP package count to 2 or 4 */
*dp_count += 2;
/* ToUUID (ACPI_DP_CHILD_UUID) */
acpigen_write_uuid(ACPI_DP_CHILD_UUID);
/* Print child pointer properties */
acpigen_write_package(child_count);
for (dp = prop; dp; dp = dp->next)
if (dp->type == ACPI_DP_TYPE_CHILD)
acpi_dp_write_property(dp);
/* Package (CHILD) length */
acpigen_pop_len();
}
/* Package (DP) length */
acpigen_pop_len();
/* Recursively parse children into separate tables */
for (dp = prop; dp; dp = dp->next)
if (dp->type == ACPI_DP_TYPE_CHILD)
acpi_dp_write(dp->child);
/* Clean up */
acpi_dp_free(table);
}
static struct acpi_dp *acpi_dp_new(struct acpi_dp *dp, enum acpi_dp_type type,
const char *name)
{
struct acpi_dp *new;
new = malloc(sizeof(struct acpi_dp));
if (!new)
return NULL;
memset(new, 0, sizeof(*new));
new->type = type;
new->name = name;
if (dp) {
/* Add to end of property list */
while (dp->next)
dp = dp->next;
dp->next = new;
}
return new;
}
struct acpi_dp *acpi_dp_new_table(const char *name)
{
return acpi_dp_new(NULL, ACPI_DP_TYPE_TABLE, name);
}
size_t acpi_dp_add_property_list(struct acpi_dp *dp,
const struct acpi_dp *property_list,
size_t property_count)
{
const struct acpi_dp *prop;
size_t i, properties_added = 0;
if (!dp || !property_list)
return 0;
for (i = 0; i < property_count; i++) {
prop = &property_list[i];
if (prop->type == ACPI_DP_TYPE_UNKNOWN || !prop->name)
continue;
switch (prop->type) {
case ACPI_DP_TYPE_INTEGER:
acpi_dp_add_integer(dp, prop->name, prop->integer);
break;
case ACPI_DP_TYPE_STRING:
acpi_dp_add_string(dp, prop->name, prop->string);
break;
case ACPI_DP_TYPE_REFERENCE:
acpi_dp_add_reference(dp, prop->name, prop->string);
break;
case ACPI_DP_TYPE_ARRAY:
acpi_dp_add_array(dp, prop->array);
break;
case ACPI_DP_TYPE_CHILD:
acpi_dp_add_child(dp, prop->name, prop->child);
break;
default:
continue;
}
++properties_added;
}
return properties_added;
}
struct acpi_dp *acpi_dp_add_integer(struct acpi_dp *dp, const char *name,
uint64_t value)
{
if (!dp)
return NULL;
struct acpi_dp *new = acpi_dp_new(dp, ACPI_DP_TYPE_INTEGER, name);
if (new)
new->integer = value;
return new;
}
struct acpi_dp *acpi_dp_add_string(struct acpi_dp *dp, const char *name,
const char *string)
{
if (!dp)
return NULL;
struct acpi_dp *new = acpi_dp_new(dp, ACPI_DP_TYPE_STRING, name);
if (new)
new->string = string;
return new;
}
struct acpi_dp *acpi_dp_add_reference(struct acpi_dp *dp, const char *name,
const char *reference)
{
if (!dp)
return NULL;
struct acpi_dp *new = acpi_dp_new(dp, ACPI_DP_TYPE_REFERENCE, name);
if (new)
new->string = reference;
return new;
}
struct acpi_dp *acpi_dp_add_child(struct acpi_dp *dp, const char *name,
struct acpi_dp *child)
{
struct acpi_dp *new;
if (!dp || !child || child->type != ACPI_DP_TYPE_TABLE)
return NULL;
new = acpi_dp_new(dp, ACPI_DP_TYPE_CHILD, name);
if (new) {
new->child = child;
new->string = child->name;
}
return new;
}
struct acpi_dp *acpi_dp_add_array(struct acpi_dp *dp, struct acpi_dp *array)
{
struct acpi_dp *new;
if (!dp || !array || array->type != ACPI_DP_TYPE_TABLE)
return NULL;
new = acpi_dp_new(dp, ACPI_DP_TYPE_ARRAY, array->name);
if (new)
new->array = array;
return new;
}
struct acpi_dp *acpi_dp_add_integer_array(struct acpi_dp *dp, const char *name,
uint64_t *array, int len)
{
struct acpi_dp *dp_array;
int i;
if (!dp || len <= 0)
return NULL;
dp_array = acpi_dp_new_table(name);
if (!dp_array)
return NULL;
for (i = 0; i < len; i++)
if (!acpi_dp_add_integer(dp_array, NULL, array[i]))
break;
acpi_dp_add_array(dp, dp_array);
return dp_array;
}
struct acpi_dp *acpi_dp_add_gpio(struct acpi_dp *dp, const char *name,
const char *ref, int index, int pin,
int active_low)
{
if (!dp)
return NULL;
struct acpi_dp *gpio = acpi_dp_new_table(name);
if (!gpio)
return NULL;
/* The device that has _CRS containing GpioIO()/GpioInt() */
acpi_dp_add_reference(gpio, NULL, ref);
/* Index of the GPIO resource in _CRS starting from zero */
acpi_dp_add_integer(gpio, NULL, index);
/* Pin in the GPIO resource, typically zero */
acpi_dp_add_integer(gpio, NULL, pin);
/* Set if pin is active low */
acpi_dp_add_integer(gpio, NULL, active_low);
acpi_dp_add_array(dp, gpio);
return gpio;
}