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 <device/path.h>
   8 #include <gpio.h>
   9 #include "chip.h"
  10
  11 const char *nauhid[MAX_HID] = {"NVTN2010", "NVTN2012"};
  12
  13 static void nau8315_fill_ssdt(const struct device *dev)
  14 {
  15         struct drivers_generic_nau8315_config *config = dev->chip_info;
  16         const char *path;
  17         struct acpi_dp *dp;
  18
  19         if (!dev->enabled || !config)
  20                 return;
  21
  22         const char *scope = acpi_device_scope(dev);
  23         const char *name = acpi_device_name(dev);
  24         if (!scope || !name)
  25                 return;
  26
  27         /* Device */
  28         acpigen_write_scope(scope);
  29         acpigen_write_device(name);
  30
  31         acpigen_write_name_string("_HID", nauhid[config->hid]);
  32         acpigen_write_name_integer("_UID", 0);
  33         acpigen_write_name_string("_DDN", dev->chip_ops->name);
  34         acpigen_write_STA(acpi_device_status(dev));
  35
  36         /* Resources */
  37         acpigen_write_name("_CRS");
  38         acpigen_write_resourcetemplate_header();
  39         acpi_device_write_gpio(&config->enable_gpio);
  40         acpigen_write_resourcetemplate_footer();
  41
  42         /* _DSD for devicetree properties */
  43         /* This points to the first pin in the first gpio entry in _CRS */
  44         path = acpi_device_path(dev);
  45         dp = acpi_dp_new_table("_DSD");
  46         acpi_dp_add_gpio(dp, "enable-gpios", path, 0, 0,
  47                          config->enable_gpio.active_low);
  48         acpi_dp_write(dp);
  49
  50         acpigen_pop_len(); /* Device */
  51         acpigen_pop_len(); /* Scope */
  52
  53         printk(BIOS_INFO, "%s: %s\n", path, dev->chip_ops->name);
  54 }
  55
  56 static const char *nau8315_acpi_name(const struct device *dev)
  57 {
  58         return "NVTN";
  59 }
  60
  61 static struct device_operations nau8315_ops = {
  62         .read_resources         = noop_read_resources,
  63         .set_resources          = noop_set_resources,
  64         .acpi_name              = nau8315_acpi_name,
  65         .acpi_fill_ssdt         = nau8315_fill_ssdt,
  66 };
  67
  68 static void nau8315_enable(struct device *dev)
  69 {
  70         dev->ops = &nau8315_ops;
  71 }
  72
  73 struct chip_operations drivers_generic_nau8315_ops = {
  74         CHIP_NAME("Nuvoton NAU8315 Amplifier")
  75         .enable_dev = nau8315_enable
  76 };