| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2016 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <arch/acpi_device.h> |
| #include <arch/acpigen.h> |
| #include <console/console.h> |
| #include <device/i2c.h> |
| #include <device/device.h> |
| #include <device/path.h> |
| #include <gpio.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include "chip.h" |
| |
| #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) |
| static void i2c_generic_fill_ssdt(struct device *dev) |
| { |
| struct drivers_i2c_generic_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 = config->bus_speed ? : I2C_SPEED_FAST, |
| .resource = scope, |
| }; |
| |
| if (!dev->enabled || !scope) |
| return; |
| |
| if (!config->hid) { |
| printk(BIOS_ERR, "%s: ERROR: HID required\n", dev_path(dev)); |
| return; |
| } |
| |
| /* Device */ |
| acpigen_write_scope(scope); |
| acpigen_write_device(acpi_device_name(dev)); |
| acpigen_write_name_string("_HID", config->hid); |
| acpigen_write_name_integer("_UID", config->uid); |
| acpigen_write_name_string("_DDN", config->desc); |
| acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON); |
| |
| /* Resources */ |
| acpigen_write_name("_CRS"); |
| acpigen_write_resourcetemplate_header(); |
| acpi_device_write_i2c(&i2c); |
| acpi_device_write_interrupt(&config->irq); |
| acpigen_write_resourcetemplate_footer(); |
| |
| /* Wake capabilities */ |
| if (config->wake) { |
| acpigen_write_name_integer("_S0W", 4); |
| acpigen_write_PRW(config->wake, 3); |
| } |
| |
| 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)); |
| } |
| |
| /* Use name specified in config or build one from I2C address */ |
| static const char *i2c_generic_acpi_name(struct device *dev) |
| { |
| struct drivers_i2c_generic_config *config = dev->chip_info; |
| static char name[5]; |
| |
| if (config->name) |
| return name; |
| |
| snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device); |
| name[4] = '\0'; |
| return name; |
| } |
| #endif |
| |
| static struct device_operations i2c_generic_ops = { |
| .read_resources = DEVICE_NOOP, |
| .set_resources = DEVICE_NOOP, |
| .enable_resources = DEVICE_NOOP, |
| #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) |
| .acpi_name = &i2c_generic_acpi_name, |
| .acpi_fill_ssdt_generator = &i2c_generic_fill_ssdt, |
| #endif |
| }; |
| |
| static void i2c_generic_enable(struct device *dev) |
| { |
| struct drivers_i2c_generic_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 = &i2c_generic_ops; |
| } |
| |
| struct chip_operations drivers_i2c_generic_ops = { |
| CHIP_NAME("I2C Device") |
| .enable_dev = &i2c_generic_enable |
| }; |