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u-boot/lib/acpi/acpi_device.c
Simon Glass fefac0b064 dm: acpi: Enhance acpi_get_name() 
For many device types it is possible to figure out the name just by
looking at its uclass or parent. Add a function to handle this, since it
allows us to cover the vast majority of cases automatically.

However it is sometimes impossible to figure out an ACPI name for a device
just by looking at its uclass. For example a touch device may have a
vendor-specific name. Add a new "acpi,name" property to allow a custom
name to be created.

With this new feature we can drop the get_name() methods in the sandbox
I2C and SPI drivers. They were only added for testing purposes. Update the
tests to use the new values.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-07-17 14:32:24 +08:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Generation of tables for particular device types
*
* Copyright 2019 Google LLC
* Mostly taken from coreboot file of the same name
*/
#include <common.h>
#include <dm.h>
#include <irq.h>
#include <log.h>
#include <usb.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <asm-generic/gpio.h>
#include <dm/acpi.h>
/**
* acpi_device_path_fill() - Find the root device and build a path from there
*
* This recursively reaches back to the root device and progressively adds path
* elements until the device is reached.
*
* @dev: Device to return path of
* @buf: Buffer to hold the path
* @buf_len: Length of buffer
* @cur: Current position in the buffer
* @return new position in buffer after adding @dev, or -ve on error
*/
static int acpi_device_path_fill(const struct udevice *dev, char *buf,
size_t buf_len, int cur)
{
char name[ACPI_NAME_MAX];
int next = 0;
int ret;
ret = acpi_get_name(dev, name);
if (ret)
return ret;
/*
* Make sure this name segment will fit, including the path segment
* separator and possible NULL terminator, if this is the last segment.
*/
if (cur + strlen(name) + 2 > buf_len)
return -ENOSPC;
/* Walk up the tree to the root device */
if (dev_get_parent(dev)) {
next = acpi_device_path_fill(dev_get_parent(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_get_parent(dev) && *name ? "." : "", name);
return next;
}
int acpi_device_path(const struct udevice *dev, char *buf, int maxlen)
{
int ret;
ret = acpi_device_path_fill(dev, buf, maxlen, 0);
if (ret < 0)
return ret;
return 0;
}
int acpi_device_scope(const struct udevice *dev, char *scope, int maxlen)
{
int ret;
if (!dev_get_parent(dev))
return log_msg_ret("noparent", -EINVAL);
ret = acpi_device_path_fill(dev_get_parent(dev), scope, maxlen, 0);
if (ret < 0)
return log_msg_ret("fill", ret);
return 0;
}
enum acpi_dev_status acpi_device_status(const struct udevice *dev)
{
return ACPI_DSTATUS_ALL_ON;
}
/**
* largeres_write_len_f() - Write a placeholder word value
*
* Write a forward length for a large resource (2 bytes)
*
* @return pointer to the zero word (for fixing up later)
*/
static void *largeres_write_len_f(struct acpi_ctx *ctx)
{
u8 *p = acpigen_get_current(ctx);
acpigen_emit_word(ctx, 0);
return p;
}
/**
* largeres_fill_from_len() - Fill in a length value
*
* This calculated the number of bytes since the provided @start and writes it
* to @ptr, which was previous returned by largeres_write_len_f().
*
* @ptr: Word to update
* @start: Start address to count from to calculated the length
*/
static void largeres_fill_from_len(struct acpi_ctx *ctx, char *ptr, u8 *start)
{
u16 len = acpigen_get_current(ctx) - start;
ptr[0] = len & 0xff;
ptr[1] = (len >> 8) & 0xff;
}
/**
* largeres_fill_len() - Fill in a length value, excluding the length itself
*
* Fill in the length field with the value calculated from after the 16bit
* field to acpigen current. This is useful since the length value does not
* include the length field itself.
*
* This calls acpi_device_largeres_fill_len() passing @ptr + 2 as @start
*
* @ptr: Word to update.
*/
static void largeres_fill_len(struct acpi_ctx *ctx, void *ptr)
{
largeres_fill_from_len(ctx, ptr, ptr + sizeof(u16));
}
/* ACPI 6.3 section 6.4.3.6: Extended Interrupt Descriptor */
static int acpi_device_write_interrupt(struct acpi_ctx *ctx,
const struct acpi_irq *irq)
{
void *desc_length;
u8 flags;
if (!irq->pin)
return -ENOENT;
/* This is supported by GpioInt() but not Interrupt() */
if (irq->polarity == ACPI_IRQ_ACTIVE_BOTH)
return -EINVAL;
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_INTERRUPT);
/* Byte 1-2: Length (filled in later) */
desc_length = largeres_write_len_f(ctx);
/*
* 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 = BIT(0); /* ResourceConsumer */
if (irq->mode == ACPI_IRQ_EDGE_TRIGGERED)
flags |= BIT(1);
if (irq->polarity == ACPI_IRQ_ACTIVE_LOW)
flags |= BIT(2);
if (irq->shared == ACPI_IRQ_SHARED)
flags |= BIT(3);
if (irq->wake == ACPI_IRQ_WAKE)
flags |= BIT(4);
acpigen_emit_byte(ctx, flags);
/* Byte 4: Interrupt Table Entry Count */
acpigen_emit_byte(ctx, 1);
/* Byte 5-8: Interrupt Number */
acpigen_emit_dword(ctx, irq->pin);
/* Fill in Descriptor Length (account for len word) */
largeres_fill_len(ctx, desc_length);
return 0;
}
int acpi_device_write_interrupt_irq(struct acpi_ctx *ctx,
const struct irq *req_irq)
{
struct acpi_irq irq;
int ret;
ret = irq_get_acpi(req_irq, &irq);
if (ret)
return log_msg_ret("get", ret);
ret = acpi_device_write_interrupt(ctx, &irq);
if (ret)
return log_msg_ret("write", ret);
return irq.pin;
}
/* ACPI 6.3 section 6.4.3.8.1 - GPIO Interrupt or I/O */
int acpi_device_write_gpio(struct acpi_ctx *ctx, const struct acpi_gpio *gpio)
{
void *start, *desc_length;
void *pin_table_offset, *vendor_data_offset, *resource_offset;
u16 flags = 0;
int pin;
if (gpio->type > ACPI_GPIO_TYPE_IO)
return -EINVAL;
start = acpigen_get_current(ctx);
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_GPIO);
/* Byte 1-2: Length (fill in later) */
desc_length = largeres_write_len_f(ctx);
/* Byte 3: Revision ID */
acpigen_emit_byte(ctx, ACPI_GPIO_REVISION_ID);
/* Byte 4: GpioIo or GpioInt */
acpigen_emit_byte(ctx, gpio->type);
/*
* Byte 5-6: General Flags
* [15:1]: 0 => Reserved
* [0]: 1 => ResourceConsumer
*/
acpigen_emit_word(ctx, 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(ctx, 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(ctx, gpio->pull);
/* Byte 10-11: Output Drive Strength in 1/100 mA */
acpigen_emit_word(ctx, gpio->output_drive_strength);
/* Byte 12-13: Debounce Timeout in 1/100 ms */
acpigen_emit_word(ctx, gpio->interrupt_debounce_timeout);
/* Byte 14-15: Pin Table Offset, relative to start */
pin_table_offset = largeres_write_len_f(ctx);
/* Byte 16: Reserved */
acpigen_emit_byte(ctx, 0);
/* Byte 17-18: Resource Source Name Offset, relative to start */
resource_offset = largeres_write_len_f(ctx);
/* Byte 19-20: Vendor Data Offset, relative to start */
vendor_data_offset = largeres_write_len_f(ctx);
/* Byte 21-22: Vendor Data Length */
acpigen_emit_word(ctx, 0);
/* Fill in Pin Table Offset */
largeres_fill_from_len(ctx, pin_table_offset, start);
/* Pin Table, one word for each pin */
for (pin = 0; pin < gpio->pin_count; pin++)
acpigen_emit_word(ctx, gpio->pins[pin]);
/* Fill in Resource Source Name Offset */
largeres_fill_from_len(ctx, resource_offset, start);
/* Resource Source Name String */
acpigen_emit_string(ctx, gpio->resource);
/* Fill in Vendor Data Offset */
largeres_fill_from_len(ctx, vendor_data_offset, start);
/* Fill in GPIO Descriptor Length (account for len word) */
largeres_fill_len(ctx, desc_length);
return gpio->pins[0];
}
int acpi_device_write_gpio_desc(struct acpi_ctx *ctx,
const struct gpio_desc *desc)
{
struct acpi_gpio gpio;
int ret;
ret = gpio_get_acpi(desc, &gpio);
if (ret)
return log_msg_ret("desc", ret);
ret = acpi_device_write_gpio(ctx, &gpio);
if (ret < 0)
return log_msg_ret("gpio", ret);
return ret;
}
int acpi_device_write_interrupt_or_gpio(struct acpi_ctx *ctx,
struct udevice *dev, const char *prop)
{
struct irq req_irq;
int pin;
int ret;
ret = irq_get_by_index(dev, 0, &req_irq);
if (!ret) {
ret = acpi_device_write_interrupt_irq(ctx, &req_irq);
if (ret < 0)
return log_msg_ret("irq", ret);
pin = ret;
} else {
struct gpio_desc req_gpio;
ret = gpio_request_by_name(dev, prop, 0, &req_gpio,
GPIOD_IS_IN);
if (ret)
return log_msg_ret("no gpio", ret);
ret = acpi_device_write_gpio_desc(ctx, &req_gpio);
if (ret < 0)
return log_msg_ret("gpio", ret);
pin = ret;
}
return pin;
}
/* PowerResource() with Enable and/or Reset control */
int acpi_device_add_power_res(struct acpi_ctx *ctx, u32 tx_state_val,
const char *dw0_read, const char *dw0_write,
const struct gpio_desc *reset_gpio,
uint reset_delay_ms, uint reset_off_delay_ms,
const struct gpio_desc *enable_gpio,
uint enable_delay_ms, uint enable_off_delay_ms,
const struct gpio_desc *stop_gpio,
uint stop_delay_ms, uint stop_off_delay_ms)
{
static const char *const power_res_dev_states[] = { "_PR0", "_PR3" };
struct acpi_gpio reset, enable, stop;
bool has_reset, has_enable, has_stop;
int ret;
gpio_get_acpi(reset_gpio, &reset);
gpio_get_acpi(enable_gpio, &enable);
gpio_get_acpi(stop_gpio, &stop);
has_reset = reset.pins[0];
has_enable = enable.pins[0];
has_stop = stop.pins[0];
if (!has_reset && !has_enable && !has_stop)
return -EINVAL;
/* PowerResource (PRIC, 0, 0) */
acpigen_write_power_res(ctx, "PRIC", 0, 0, power_res_dev_states,
ARRAY_SIZE(power_res_dev_states));
/* Method (_STA, 0, NotSerialized) { Return (0x1) } */
acpigen_write_sta(ctx, 0x1);
/* Method (_ON, 0, Serialized) */
acpigen_write_method_serialized(ctx, "_ON", 0);
if (reset_gpio) {
ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
dw0_write, &reset, true);
if (ret)
return log_msg_ret("reset1", ret);
}
if (has_enable) {
ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
dw0_write, &enable, true);
if (ret)
return log_msg_ret("enable1", ret);
if (enable_delay_ms)
acpigen_write_sleep(ctx, enable_delay_ms);
}
if (has_reset) {
ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
dw0_write, &reset, false);
if (ret)
return log_msg_ret("reset2", ret);
if (reset_delay_ms)
acpigen_write_sleep(ctx, reset_delay_ms);
}
if (has_stop) {
ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
dw0_write, &stop, false);
if (ret)
return log_msg_ret("stop1", ret);
if (stop_delay_ms)
acpigen_write_sleep(ctx, stop_delay_ms);
}
acpigen_pop_len(ctx); /* _ON method */
/* Method (_OFF, 0, Serialized) */
acpigen_write_method_serialized(ctx, "_OFF", 0);
if (has_stop) {
ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
dw0_write, &stop, true);
if (ret)
return log_msg_ret("stop2", ret);
if (stop_off_delay_ms)
acpigen_write_sleep(ctx, stop_off_delay_ms);
}
if (has_reset) {
ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
dw0_write, &reset, true);
if (ret)
return log_msg_ret("reset3", ret);
if (reset_off_delay_ms)
acpigen_write_sleep(ctx, reset_off_delay_ms);
}
if (has_enable) {
ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
dw0_write, &enable, false);
if (ret)
return log_msg_ret("enable2", ret);
if (enable_off_delay_ms)
acpigen_write_sleep(ctx, enable_off_delay_ms);
}
acpigen_pop_len(ctx); /* _OFF method */
acpigen_pop_len(ctx); /* PowerResource PRIC */
return 0;
}
/* ACPI 6.3 section 6.4.3.8.2.1 - I2cSerialBus() */
static void acpi_device_write_i2c(struct acpi_ctx *ctx,
const struct acpi_i2c *i2c)
{
void *desc_length, *type_length;
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_SERIAL_BUS);
/* Byte 1+2: Length (filled in later) */
desc_length = largeres_write_len_f(ctx);
/* Byte 3: Revision ID */
acpigen_emit_byte(ctx, ACPI_I2C_SERIAL_BUS_REVISION_ID);
/* Byte 4: Resource Source Index is Reserved */
acpigen_emit_byte(ctx, 0);
/* Byte 5: Serial Bus Type is I2C */
acpigen_emit_byte(ctx, ACPI_SERIAL_BUS_TYPE_I2C);
/*
* Byte 6: Flags
* [7:2]: 0 => Reserved
* [1]: 1 => ResourceConsumer
* [0]: 0 => ControllerInitiated
*/
acpigen_emit_byte(ctx, 1 << 1);
/*
* Byte 7-8: Type Specific Flags
* [15:1]: 0 => Reserved
* [0]: 0 => 7bit, 1 => 10bit
*/
acpigen_emit_word(ctx, i2c->mode_10bit);
/* Byte 9: Type Specific Revision ID */
acpigen_emit_byte(ctx, ACPI_I2C_TYPE_SPECIFIC_REVISION_ID);
/* Byte 10-11: I2C Type Data Length */
type_length = largeres_write_len_f(ctx);
/* Byte 12-15: I2C Bus Speed */
acpigen_emit_dword(ctx, i2c->speed);
/* Byte 16-17: I2C Slave Address */
acpigen_emit_word(ctx, i2c->address);
/* Fill in Type Data Length */
largeres_fill_len(ctx, type_length);
/* Byte 18+: ResourceSource */
acpigen_emit_string(ctx, i2c->resource);
/* Fill in I2C Descriptor Length */
largeres_fill_len(ctx, desc_length);
}
/**
* acpi_device_set_i2c() - Set up an ACPI I2C struct from a device
*
* The value of @scope is not copied, but only referenced. This implies the
* caller has to ensure it stays valid for the lifetime of @i2c.
*
* @dev: I2C device to convert
* @i2c: Place to put the new structure
* @scope: Scope of the I2C device (this is the controller path)
* @return chip address of device
*/
static int acpi_device_set_i2c(const struct udevice *dev, struct acpi_i2c *i2c,
const char *scope)
{
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
struct udevice *bus = dev_get_parent(dev);
memset(i2c, '\0', sizeof(*i2c));
i2c->address = chip->chip_addr;
i2c->mode_10bit = 0;
/*
* i2c_bus->speed_hz is set if this device is probed, but if not we
* must use the device tree
*/
i2c->speed = dev_read_u32_default(bus, "clock-frequency",
I2C_SPEED_STANDARD_RATE);
i2c->resource = scope;
return i2c->address;
}
int acpi_device_write_i2c_dev(struct acpi_ctx *ctx, const struct udevice *dev)
{
char scope[ACPI_PATH_MAX];
struct acpi_i2c i2c;
int ret;
ret = acpi_device_scope(dev, scope, sizeof(scope));
if (ret)
return log_msg_ret("scope", ret);
ret = acpi_device_set_i2c(dev, &i2c, scope);
if (ret < 0)
return log_msg_ret("set", ret);
acpi_device_write_i2c(ctx, &i2c);
return ret;
}
#ifdef CONFIG_SPI
/* ACPI 6.1 section 6.4.3.8.2.2 - SpiSerialBus() */
static void acpi_device_write_spi(struct acpi_ctx *ctx, const struct acpi_spi *spi)
{
void *desc_length, *type_length;
u16 flags = 0;
/* Byte 0: Descriptor Type */
acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_SERIAL_BUS);
/* Byte 1+2: Length (filled in later) */
desc_length = largeres_write_len_f(ctx);
/* Byte 3: Revision ID */
acpigen_emit_byte(ctx, ACPI_SPI_SERIAL_BUS_REVISION_ID);
/* Byte 4: Resource Source Index is Reserved */
acpigen_emit_byte(ctx, 0);
/* Byte 5: Serial Bus Type is SPI */
acpigen_emit_byte(ctx, ACPI_SERIAL_BUS_TYPE_SPI);
/*
* Byte 6: Flags
* [7:2]: 0 => Reserved
* [1]: 1 => ResourceConsumer
* [0]: 0 => ControllerInitiated
*/
acpigen_emit_byte(ctx, BIT(1));
/*
* Byte 7-8: Type Specific Flags
* [15:2]: 0 => Reserveda
* [1]: 0 => ActiveLow, 1 => ActiveHigh
* [0]: 0 => FourWire, 1 => ThreeWire
*/
if (spi->wire_mode == SPI_3_WIRE_MODE)
flags |= BIT(0);
if (spi->device_select_polarity == SPI_POLARITY_HIGH)
flags |= BIT(1);
acpigen_emit_word(ctx, flags);
/* Byte 9: Type Specific Revision ID */
acpigen_emit_byte(ctx, ACPI_SPI_TYPE_SPECIFIC_REVISION_ID);
/* Byte 10-11: SPI Type Data Length */
type_length = largeres_write_len_f(ctx);
/* Byte 12-15: Connection Speed */
acpigen_emit_dword(ctx, spi->speed);
/* Byte 16: Data Bit Length */
acpigen_emit_byte(ctx, spi->data_bit_length);
/* Byte 17: Clock Phase */
acpigen_emit_byte(ctx, spi->clock_phase);
/* Byte 18: Clock Polarity */
acpigen_emit_byte(ctx, spi->clock_polarity);
/* Byte 19-20: Device Selection */
acpigen_emit_word(ctx, spi->device_select);
/* Fill in Type Data Length */
largeres_fill_len(ctx, type_length);
/* Byte 21+: ResourceSource String */
acpigen_emit_string(ctx, spi->resource);
/* Fill in SPI Descriptor Length */
largeres_fill_len(ctx, desc_length);
}
/**
* acpi_device_set_spi() - Set up an ACPI SPI struct from a device
*
* The value of @scope is not copied, but only referenced. This implies the
* caller has to ensure it stays valid for the lifetime of @spi.
*
* @dev: SPI device to convert
* @spi: Place to put the new structure
* @scope: Scope of the SPI device (this is the controller path)
* @return 0 (always)
*/
static int acpi_device_set_spi(const struct udevice *dev, struct acpi_spi *spi,
const char *scope)
{
struct dm_spi_slave_platdata *plat;
struct spi_slave *slave = dev_get_parent_priv(dev);
plat = dev_get_parent_platdata(slave->dev);
memset(spi, '\0', sizeof(*spi));
spi->device_select = plat->cs;
spi->device_select_polarity = SPI_POLARITY_LOW;
spi->wire_mode = SPI_4_WIRE_MODE;
spi->speed = plat->max_hz;
spi->data_bit_length = slave->wordlen;
spi->clock_phase = plat->mode & SPI_CPHA ?
SPI_CLOCK_PHASE_SECOND : SPI_CLOCK_PHASE_FIRST;
spi->clock_polarity = plat->mode & SPI_CPOL ?
SPI_POLARITY_HIGH : SPI_POLARITY_LOW;
spi->resource = scope;
return 0;
}
int acpi_device_write_spi_dev(struct acpi_ctx *ctx, const struct udevice *dev)
{
char scope[ACPI_PATH_MAX];
struct acpi_spi spi;
int ret;
ret = acpi_device_scope(dev, scope, sizeof(scope));
if (ret)
return log_msg_ret("scope", ret);
ret = acpi_device_set_spi(dev, &spi, scope);
if (ret)
return log_msg_ret("set", ret);
acpi_device_write_spi(ctx, &spi);
return 0;
}
#endif /* CONFIG_SPI */
static const char *acpi_name_from_id(enum uclass_id id)
{
switch (id) {
case UCLASS_USB_HUB:
/* Root Hub */
return "RHUB";
/* DSDT: acpi/northbridge.asl */
case UCLASS_NORTHBRIDGE:
return "MCHC";
/* DSDT: acpi/lpc.asl */
case UCLASS_LPC:
return "LPCB";
/* DSDT: acpi/xhci.asl */
case UCLASS_USB:
/* This only supports USB3.0 controllers at present */
return "XHCI";
case UCLASS_PWM:
return "PWM";
default:
return NULL;
}
}
static int acpi_check_seq(const struct udevice *dev)
{
if (dev->req_seq == -1) {
log_warning("Device '%s' has no seq\n", dev->name);
return log_msg_ret("no seq", -ENXIO);
}
return dev->req_seq;
}
/* If you change this function, add test cases to dm_test_acpi_get_name() */
int acpi_device_infer_name(const struct udevice *dev, char *out_name)
{
enum uclass_id parent_id = UCLASS_INVALID;
enum uclass_id id;
const char *name = NULL;
id = device_get_uclass_id(dev);
if (dev_get_parent(dev))
parent_id = device_get_uclass_id(dev_get_parent(dev));
if (id == UCLASS_SOUND)
name = "HDAS";
else if (id == UCLASS_PCI)
name = "PCI0";
else if (device_is_on_pci_bus(dev))
name = acpi_name_from_id(id);
if (!name) {
switch (parent_id) {
case UCLASS_USB: {
struct usb_device *udev = dev_get_parent_priv(dev);
sprintf(out_name, udev->speed >= USB_SPEED_SUPER ?
"HS%02d" : "FS%02d", udev->portnr);
name = out_name;
break;
}
default:
break;
}
}
if (!name) {
int num;
switch (id) {
/* DSDT: acpi/lpss.asl */
case UCLASS_SERIAL:
num = acpi_check_seq(dev);
if (num < 0)
return num;
sprintf(out_name, "URT%d", num);
name = out_name;
break;
case UCLASS_I2C:
num = acpi_check_seq(dev);
if (num < 0)
return num;
sprintf(out_name, "I2C%d", num);
name = out_name;
break;
case UCLASS_SPI:
num = acpi_check_seq(dev);
if (num < 0)
return num;
sprintf(out_name, "SPI%d", num);
name = out_name;
break;
default:
break;
}
}
if (!name) {
log_warning("No name for device '%s'\n", dev->name);
return -ENOENT;
}
if (name != out_name)
acpi_copy_name(out_name, name);
return 0;
}
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