sx9360.c

Go to the documentation of this file.

/* 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_SX9360_ACPI_ID      "STH9360"
#define I2C_SX9360_CHIP_NAME    "Semtech SX9360"
 
static void i2c_sx9360_fill_ssdt(const struct device *dev)
{
        struct drivers_i2c_sx9360_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;
 
        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_SX9360_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 described in linux kernel documentation. See
         * https://www.kernel.org/doc/Documentation/devicetree/bindings/iio/proximity/semtech%2Csx9360.yaml
         */
        acpi_dp_add_integer(dsd, "semtech,proxraw-strength",
                            config->proxraw_strength);
        acpi_dp_add_integer(dsd, "semtech,avg-pos-strength",
                            config->avg_pos_strength);
        acpi_dp_add_integer(dsd, "semtech,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_sx9360_acpi_name(const struct device *dev)
{
        static char name[5];
 
        snprintf(name, sizeof(name), "SX%02.2X", dev->path.i2c.device);
        return name;
}
 
static struct device_operations i2c_sx9360_ops = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .acpi_name              = i2c_sx9360_acpi_name,
        .acpi_fill_ssdt         = i2c_sx9360_fill_ssdt,
};
 
static void i2c_sx9360_enable(struct device *dev)
{
        struct drivers_i2c_sx9360_config *config = config_of(dev);
 
        if (!is_dev_enabled(dev))
                return;
 
        dev->ops = &i2c_sx9360_ops;
 
        if (config->desc)
                dev->name = config->desc;
}
 
struct chip_operations drivers_i2c_sx9360_ops = {
        CHIP_NAME(I2C_SX9360_CHIP_NAME)
        .enable_dev = i2c_sx9360_enable
};