src/drivers/generic/nau8315/nau8315.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 <gpio.h>
   8 #include "chip.h"
   9
  10 const char *nauhid[MAX_HID] = {"NVTN2010", "NVTN2012"};
  11
  12 static void nau8315_fill_ssdt(const struct device *dev)
  13 {
  14         struct drivers_generic_nau8315_config *config = dev->chip_info;
  15         const char *path;
  16         struct acpi_dp *dp;
  17
  18         if (!dev->enabled || !config)
  19                 return;
  20
  21         const char *scope = acpi_device_scope(dev);
  22         const char *name = acpi_device_name(dev);
  23         if (!scope || !name)
  24                 return;
  25
  26         /* Device */
  27         acpigen_write_scope(scope);
  28         acpigen_write_device(name);
  29
  30         acpigen_write_name_string("_HID", nauhid[config->hid]);
  31         acpigen_write_name_integer("_UID", 0);
  32         acpigen_write_name_string("_DDN", dev->chip_ops->name);
  33         acpigen_write_STA(acpi_device_status(dev));
  34
  35         /* Resources */
  36         acpigen_write_name("_CRS");
  37         acpigen_write_resourcetemplate_header();
  38         acpi_device_write_gpio(&config->enable_gpio);
  39         acpigen_write_resourcetemplate_footer();
  40
  41         /* _DSD for devicetree properties */
  42         /* This points to the first pin in the first gpio entry in _CRS */
  43         path = acpi_device_path(dev);
  44         dp = acpi_dp_new_table("_DSD");
  45         acpi_dp_add_gpio(dp, "enable-gpios", path, 0, 0,
  46                          config->enable_gpio.active_low);
  47         acpi_dp_write(dp);
  48
  49         acpigen_pop_len(); /* Device */
  50         acpigen_pop_len(); /* Scope */
  51
  52         printk(BIOS_INFO, "%s: %s\n", path, dev->chip_ops->name);
  53 }
  54
  55 static const char *nau8315_acpi_name(const struct device *dev)
  56 {
  57         return "NVTN";
  58 }
  59
  60 static struct device_operations nau8315_ops = {
  61         .read_resources         = noop_read_resources,
  62         .set_resources          = noop_set_resources,
  63         .acpi_name              = nau8315_acpi_name,
  64         .acpi_fill_ssdt         = nau8315_fill_ssdt,
  65 };
  66
  67 static void nau8315_enable(struct device *dev)
  68 {
  69         dev->ops = &nau8315_ops;
  70 }
  71
  72 struct chip_operations drivers_generic_nau8315_ops = {
  73         .name = "Nuvoton NAU8315 Amplifier",
  74         .enable_dev = nau8315_enable
  75 };