src/ec/google/chromeec/i2c_tunnel/i2c_tunnel.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <acpi/acpi_device.h>
   4 #include <acpi/acpigen.h>
   5 #include <console/console.h>
   6 #include <device/device.h>
   7 #include <device/path.h>
   8 #include <stdio.h>
   9
  10 #include "chip.h"
  11
  12 #define CROS_EC_I2C_TUNNEL_HID          "GOOG0012"
  13 #define CROS_EC_I2C_TUNNEL_DDN          "Cros EC I2C Tunnel"
  14
  15 static void crosec_i2c_tunnel_fill_ssdt(const struct device *dev)
  16 {
  17         const char *scope = acpi_device_scope(dev);
  18         struct ec_google_chromeec_i2c_tunnel_config *cfg = dev->chip_info;
  19         struct acpi_dp *dsd;
  20
  21         if (!scope || !cfg)
  22                 return;
  23
  24         acpigen_write_scope(scope);
  25
  26         acpigen_write_device(acpi_device_name(dev));
  27         acpigen_write_name_string("_HID", CROS_EC_I2C_TUNNEL_HID);
  28         acpigen_write_name_integer("_UID", cfg->uid);
  29         acpigen_write_name_string("_DDN", CROS_EC_I2C_TUNNEL_DDN);
  30         acpigen_write_STA(acpi_device_status(dev));
  31
  32         dsd = acpi_dp_new_table("_DSD");
  33         acpi_dp_add_integer(dsd, "google,remote-bus", cfg->remote_bus);
  34         acpi_dp_write(dsd);
  35
  36         acpigen_pop_len(); /* Device */
  37         acpigen_pop_len(); /* Scope */
  38
  39         printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), CROS_EC_I2C_TUNNEL_DDN,
  40                                                 dev_path(dev));
  41 }
  42
  43 static const char *crosec_i2c_tunnel_acpi_name(const struct device *dev)
  44 {
  45         struct ec_google_chromeec_i2c_tunnel_config *cfg = dev->chip_info;
  46         static char name[5];
  47
  48         if (cfg->name)
  49                 return cfg->name;
  50
  51         snprintf(name, sizeof(name), "TUN%X", dev->path.generic.id);
  52         return name;
  53 }
  54
  55 static struct device_operations crosec_i2c_tunnel_ops = {
  56         .read_resources         = noop_read_resources,
  57         .set_resources          = noop_set_resources,
  58         .acpi_name              = crosec_i2c_tunnel_acpi_name,
  59         .acpi_fill_ssdt         = crosec_i2c_tunnel_fill_ssdt,
  60         .scan_bus               = scan_static_bus,
  61 };
  62
  63 static void crosec_i2c_tunnel_enable(struct device *dev)
  64 {
  65         dev->ops = &crosec_i2c_tunnel_ops;
  66 }
  67
  68 struct chip_operations ec_google_chromeec_i2c_tunnel_ops = {
  69         .name = "CrosEC I2C Tunnel Device",
  70         .enable_dev = crosec_i2c_tunnel_enable
  71 };