src/drivers/i2c/gpiomux/bus/bus.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpi_device.h>
   4 #include <acpi/acpigen.h>
   5 #include <console/console.h>
   6 #include <device/device.h>
   7 #include <stdio.h>
   8
   9 #include "chip.h"
  10
  11 static const char *i2c_gpiomux_bus_acpi_name(const struct device *dev)
  12 {
  13         static char name[ACPI_NAME_BUFFER_SIZE];
  14
  15         snprintf(name, ACPI_NAME_BUFFER_SIZE, "MXA%01.1X", dev->path.generic.id);
  16         return name;
  17 }
  18
  19 static void i2c_gpiomux_bus_fill_ssdt(const struct device *dev)
  20 {
  21         const char *scope = acpi_device_scope(dev);
  22         const char *path = acpi_device_path(dev);
  23
  24         if (!dev || !scope || !path)
  25                 return;
  26
  27         /* Device */
  28         acpigen_write_scope(scope);
  29         acpigen_write_device(acpi_device_name(dev));
  30
  31         acpigen_write_STA(acpi_device_status(dev));
  32         acpigen_write_ADR(dev->path.generic.id);
  33
  34         acpigen_pop_len(); /* Device */
  35         acpigen_pop_len(); /* Scope */
  36
  37         printk(BIOS_INFO, "%s: %s at %s\n", path, dev->chip_ops->name, dev_path(dev));
  38 }
  39
  40 static struct device_operations i2c_gpiomux_bus_ops = {
  41         .read_resources         = noop_read_resources,
  42         .set_resources          = noop_set_resources,
  43         .scan_bus               = scan_static_bus,
  44         .acpi_name              = i2c_gpiomux_bus_acpi_name,
  45         .acpi_fill_ssdt         = i2c_gpiomux_bus_fill_ssdt,
  46 };
  47
  48 static void i2c_gpiomux_bus_enable(struct device *dev)
  49 {
  50         if (!dev)
  51                 return;
  52
  53         dev->ops = &i2c_gpiomux_bus_ops;
  54 }
  55
  56 struct chip_operations drivers_i2c_gpiomux_bus_ops = {
  57         .name = "I2C GPIO MUX Bus Device",
  58         .enable_dev = i2c_gpiomux_bus_enable
  59 };