max98357a.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <gpio.h>
#include "chip.h"
 
#define MAX98357A_ACPI_NAME     "MAXM"
 
static void max98357a_fill_ssdt(const struct device *dev)
{
        struct drivers_generic_max98357a_config *config = dev->chip_info;
        const char *path;
        struct acpi_dp *dp;
 
        if (!config)
                return;
 
        const char *scope = acpi_device_scope(dev);
        const char *name = acpi_device_name(dev);
        if (!scope || !name)
                return;
 
        if (!config->hid) {
                printk(BIOS_ERR, "%s: ERROR: _HID required\n", dev_path(dev));
                return;
        }
 
        /* Device */
        acpigen_write_scope(scope);
        acpigen_write_device(name);
 
        acpigen_write_name_string("_HID", config->hid);
        acpigen_write_name_integer("_UID", 0);
        acpigen_write_name_string("_DDN", dev->chip_ops->name);
        acpigen_write_STA(acpi_device_status(dev));
 
        /* Resources */
        acpigen_write_name("_CRS");
        acpigen_write_resourcetemplate_header();
        acpi_device_write_gpio(&config->sdmode_gpio);
        acpigen_write_resourcetemplate_footer();
 
        /* _DSD for devicetree properties */
        /* This points to the first pin in the first gpio entry in _CRS */
        path = acpi_device_path(dev);
        dp = acpi_dp_new_table("_DSD");
        acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0,
                         config->sdmode_gpio.active_low);
        acpi_dp_add_integer(dp, "sdmode-delay", config->sdmode_delay);
        acpi_dp_write(dp);
 
        acpigen_pop_len(); /* Device */
        acpigen_pop_len(); /* Scope */
 
        printk(BIOS_INFO, "%s: %s\n", path, dev->chip_ops->name);
}
 
static const char *max98357a_acpi_name(const struct device *dev)
{
        return MAX98357A_ACPI_NAME;
}
 
static struct device_operations max98357a_ops = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .acpi_name              = max98357a_acpi_name,
        .acpi_fill_ssdt         = max98357a_fill_ssdt,
};
 
static void max98357a_enable(struct device *dev)
{
        struct drivers_generic_max98357a_config *config = dev->chip_info;
 
        /* Check if device is present by reading GPIO */
        if (config->device_present_gpio) {
                int present = gpio_get(config->device_present_gpio);
                present ^= config->device_present_gpio_invert;
 
                printk(BIOS_INFO, "%s is %spresent\n",
                       dev->chip_ops->name, present ? "" : "not ");
 
                if (!present) {
                        dev->enabled = 0;
                        return;
                }
        }
 
        dev->ops = &max98357a_ops;
}
 
struct chip_operations drivers_generic_max98357a_ops = {
        CHIP_NAME("Maxim Integrated 98357A Amplifier")
        .enable_dev = max98357a_enable
};