sx9310.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/i2c_simple.h>
#include <device/device.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
 
#define I2C_SX9310_ACPI_ID      "STH9310"
#define I2C_SX9310_ACPI_NAME    "Semtech SX9310"
 
static const char * const i2c_sx9310_resolution[] = {
        [SX9310_COARSEST] = "coarsest",
        [SX9310_VERY_COARSE] = "very-coarse",
        [SX9310_COARSE] = "coarse",
        [SX9310_MEDIUM_COARSE] = "medium-coarse",
        [SX9310_MEDIUM] = "medium",
        [SX9310_FINE] = "fine",
        [SX9310_VERY_FINE] = "very-fine",
        [SX9310_FINEST] = "finest",
};
 
static void i2c_sx9310_fill_ssdt(const struct device *dev)
{
        struct drivers_i2c_sx9310_config *config = dev->chip_info;
        const char *scope = acpi_device_scope(dev);
        struct acpi_i2c i2c = {
                .address = dev->path.i2c.device,
                .mode_10bit = dev->path.i2c.mode_10bit,
                .speed = I2C_SPEED_FAST,
                .resource = scope,
        };
        struct acpi_dp *dsd;
        struct acpi_dp *combined_sensors;
 
        if (!scope || !config)
                return;
 
        if (config->speed)
                i2c.speed = config->speed;
 
        /* Device */
        acpigen_write_scope(scope);
        acpigen_write_device(acpi_device_name(dev));
        acpigen_write_name_string("_HID", I2C_SX9310_ACPI_ID);
        acpigen_write_name_integer("_UID", config->uid);
        acpigen_write_name_string("_DDN", config->desc);
        acpigen_write_STA(acpi_device_status(dev));
 
        /* Resources */
        acpigen_write_name("_CRS");
        acpigen_write_resourcetemplate_header();
        acpi_device_write_i2c(&i2c);
 
        if (config->irq_gpio.pin_count)
                acpi_device_write_gpio(&config->irq_gpio);
        else
                acpi_device_write_interrupt(&config->irq);
 
        acpigen_write_resourcetemplate_footer();
 
        /* DSD */
        dsd = acpi_dp_new_table("_DSD");
 
        /*
         * Format describe in linux kernel documentation. See
         * https://www.kernel.org/doc/Documentation/devicetree/bindings/iio/proximity/semtech%2Csx9310.yaml
         */
        acpi_dp_add_integer(dsd, "semtech,cs0-ground", config->cs0_ground);
        acpi_dp_add_integer(dsd, "semtech,startup-sensor",
                        config->startup_sensor);
        acpi_dp_add_integer(dsd, "semtech,proxraw-strength",
                        config->proxraw_strength);
        acpi_dp_add_integer(dsd, "semtech,avg-pos-strength",
                        config->avg_pos_strength);
 
        /* Add combined_sensors package */
        if (config->combined_sensors_count > 0) {
                combined_sensors = acpi_dp_new_table("semtech,combined-sensors");
                for (int i = 0;
                                i < config->combined_sensors_count &&
                                i < MAX_COMBINED_SENSORS_ENTRIES; ++i) {
                        acpi_dp_add_integer(combined_sensors, NULL,
                                            config->combined_sensors[i]);
                }
                acpi_dp_add_array(dsd, combined_sensors);
        }
        if (config->resolution && config->resolution < ARRAY_SIZE(i2c_sx9310_resolution))
                acpi_dp_add_string(dsd, "semtech,resolution",
                                   i2c_sx9310_resolution[config->resolution]);
 
        acpi_dp_write(dsd);
        acpigen_pop_len(); /* Device */
        acpigen_pop_len(); /* Scope */
 
        printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
               config->desc ? : dev->chip_ops->name, dev_path(dev));
}
 
static const char *i2c_sx9310_acpi_name(const struct device *dev)
{
        static char name[5];
 
        snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device);
        return name;
}
 
static struct device_operations i2c_sx9310_ops = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .acpi_name              = i2c_sx9310_acpi_name,
        .acpi_fill_ssdt         = i2c_sx9310_fill_ssdt,
};
 
static void i2c_sx9310_enable(struct device *dev)
{
        struct drivers_i2c_sx9310_config *config = dev->chip_info;
 
        if (!config) {
                dev->enabled = 0;
                return;
        }
 
        dev->ops = &i2c_sx9310_ops;
 
        if (config->desc)
                dev->name = config->desc;
}
 
struct chip_operations drivers_i2c_sx9310_ops = {
        CHIP_NAME(I2C_SX9310_ACPI_NAME)
        .enable_dev = i2c_sx9310_enable
};