src/drivers/i2c/sx9360/sx9360.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/i2c_simple.h>
   7 #include <device/device.h>
   8 #include <stdio.h>
   9
  10 #include "chip.h"
  11
  12 #define I2C_SX9360_ACPI_ID      "STH9360"
  13 #define I2C_SX9360_CHIP_NAME    "Semtech SX9360"
  14
  15 static void i2c_sx9360_fill_ssdt(const struct device *dev)
  16 {
  17         struct drivers_i2c_sx9360_config *config = dev->chip_info;
  18         const char *scope = acpi_device_scope(dev);
  19         struct acpi_i2c i2c = {
  20                 .address = dev->path.i2c.device,
  21                 .mode_10bit = dev->path.i2c.mode_10bit,
  22                 .speed = I2C_SPEED_FAST,
  23                 .resource = scope,
  24         };
  25         struct acpi_dp *dsd;
  26
  27         if (!scope || !config)
  28                 return;
  29
  30         if (config->speed)
  31                 i2c.speed = config->speed;
  32
  33         /* Device */
  34         acpigen_write_scope(scope);
  35         acpigen_write_device(acpi_device_name(dev));
  36         acpigen_write_name_string("_HID", I2C_SX9360_ACPI_ID);
  37         acpigen_write_name_integer("_UID", config->uid);
  38         acpigen_write_name_string("_DDN", config->desc);
  39         acpigen_write_STA(acpi_device_status(dev));
  40
  41         /* Resources */
  42         acpigen_write_name("_CRS");
  43         acpigen_write_resourcetemplate_header();
  44         acpi_device_write_i2c(&i2c);
  45
  46         if (config->irq_gpio.pin_count)
  47                 acpi_device_write_gpio(&config->irq_gpio);
  48         else
  49                 acpi_device_write_interrupt(&config->irq);
  50
  51         acpigen_write_resourcetemplate_footer();
  52
  53         /* DSD */
  54         dsd = acpi_dp_new_table("_DSD");
  55
  56         /*
  57          * Format described in linux kernel documentation. See
  58          * https://www.kernel.org/doc/Documentation/devicetree/bindings/iio/proximity/semtech%2Csx9360.yaml
  59          */
  60         acpi_dp_add_integer(dsd, "semtech,proxraw-strength",
  61                             config->proxraw_strength);
  62         acpi_dp_add_integer(dsd, "semtech,avg-pos-strength",
  63                             config->avg_pos_strength);
  64         acpi_dp_add_integer(dsd, "semtech,resolution",
  65                             config->resolution);
  66
  67         acpi_dp_write(dsd);
  68
  69         acpigen_pop_len(); /* Device */
  70         acpigen_pop_len(); /* Scope */
  71
  72         printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
  73                config->desc ? : dev->chip_ops->name, dev_path(dev));
  74 }
  75
  76 static const char *i2c_sx9360_acpi_name(const struct device *dev)
  77 {
  78         static char name[5];
  79
  80         snprintf(name, sizeof(name), "SX%02.2X", dev->path.i2c.device);
  81         return name;
  82 }
  83
  84 static struct device_operations i2c_sx9360_ops = {
  85         .read_resources         = noop_read_resources,
  86         .set_resources          = noop_set_resources,
  87         .acpi_name              = i2c_sx9360_acpi_name,
  88         .acpi_fill_ssdt         = i2c_sx9360_fill_ssdt,
  89 };
  90
  91 static void i2c_sx9360_enable(struct device *dev)
  92 {
  93         struct drivers_i2c_sx9360_config *config = config_of(dev);
  94
  95         if (!is_dev_enabled(dev))
  96                 return;
  97
  98         dev->ops = &i2c_sx9360_ops;
  99
 100         if (config->desc)
 101                 dev->name = config->desc;
 102 }
 103
 104 struct chip_operations drivers_i2c_sx9360_ops = {
 105         .name = I2C_SX9360_CHIP_NAME,
 106         .enable_dev = i2c_sx9360_enable
 107 };