src/drivers/generic/max98357a/max98357a.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 #define MAX98357A_ACPI_NAME     "MAXM"
  11
  12 static void max98357a_fill_ssdt(const struct device *dev)
  13 {
  14         struct drivers_generic_max98357a_config *config = dev->chip_info;
  15         const char *path;
  16         struct acpi_dp *dp;
  17
  18         if (!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         if (!config->hid) {
  27                 printk(BIOS_ERR, "%s: ERROR: _HID required\n", dev_path(dev));
  28                 return;
  29         }
  30
  31         /* Device */
  32         acpigen_write_scope(scope);
  33         acpigen_write_device(name);
  34
  35         acpigen_write_name_string("_HID", config->hid);
  36         acpigen_write_name_integer("_UID", 0);
  37         acpigen_write_name_string("_DDN", dev->chip_ops->name);
  38         acpigen_write_STA(acpi_device_status(dev));
  39
  40         /* Resources */
  41         acpigen_write_name("_CRS");
  42         acpigen_write_resourcetemplate_header();
  43         acpi_device_write_gpio(&config->sdmode_gpio);
  44         acpigen_write_resourcetemplate_footer();
  45
  46         /* _DSD for devicetree properties */
  47         /* This points to the first pin in the first gpio entry in _CRS */
  48         path = acpi_device_path(dev);
  49         dp = acpi_dp_new_table("_DSD");
  50         acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0,
  51                          config->sdmode_gpio.active_low);
  52         acpi_dp_add_integer(dp, "sdmode-delay", config->sdmode_delay);
  53         acpi_dp_write(dp);
  54
  55         acpigen_pop_len(); /* Device */
  56         acpigen_pop_len(); /* Scope */
  57
  58         printk(BIOS_INFO, "%s: %s\n", path, dev->chip_ops->name);
  59 }
  60
  61 static const char *max98357a_acpi_name(const struct device *dev)
  62 {
  63         return MAX98357A_ACPI_NAME;
  64 }
  65
  66 static struct device_operations max98357a_ops = {
  67         .read_resources         = noop_read_resources,
  68         .set_resources          = noop_set_resources,
  69         .acpi_name              = max98357a_acpi_name,
  70         .acpi_fill_ssdt         = max98357a_fill_ssdt,
  71 };
  72
  73 static void max98357a_enable(struct device *dev)
  74 {
  75         struct drivers_generic_max98357a_config *config = dev->chip_info;
  76
  77         /* Check if device is present by reading GPIO */
  78         if (config->device_present_gpio) {
  79                 int present = gpio_get(config->device_present_gpio);
  80                 present ^= config->device_present_gpio_invert;
  81
  82                 printk(BIOS_INFO, "%s is %spresent\n",
  83                        dev->chip_ops->name, present ? "" : "not ");
  84
  85                 if (!present) {
  86                         dev->enabled = 0;
  87                         return;
  88                 }
  89         }
  90
  91         dev->ops = &max98357a_ops;
  92 }
  93
  94 struct chip_operations drivers_generic_max98357a_ops = {
  95         .name = "Maxim Integrated 98357A Amplifier",
  96         .enable_dev = max98357a_enable
  97 };