/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include #include #include "chip.h" #if CONFIG(HAVE_ACPI_TABLES) static bool i2c_generic_add_gpios_to_crs(struct drivers_i2c_generic_config *cfg) { /* * Return false if: * 1. GPIOs are exported via a power resource, or * 2. Both reset and enable GPIOs are not provided. */ if (cfg->has_power_resource || ((cfg->reset_gpio.pin_count == 0) && (cfg->enable_gpio.pin_count == 0))) return false; return true; } void i2c_generic_fill_ssdt(const struct device *dev, void (*callback)(const struct device *dev), struct drivers_i2c_generic_config *config) { 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->speed ? : I2C_SPEED_FAST, .resource = scope, }; struct acpi_dp *dsd = NULL; int curr_index = 0; int reset_gpio_index = -1, enable_gpio_index = -1, irq_gpio_index = -1; const char *path = acpi_device_path(dev); if (!scope) return; if (!config->hid) { printk(BIOS_ERR, "%s: HID required but not set\n", dev_path(dev)); return; } if (config->detect) { struct device *const busdev = i2c_busdev(dev); if (!i2c_dev_detect(busdev, dev->path.i2c.device)) { printk(BIOS_SPEW, "%s: %s at %s -- NOT FOUND, skipping\n", path, config->desc ? : dev->chip_ops->name, dev_path(dev)); return; } } /* Device */ acpigen_write_scope(scope); acpigen_write_device(acpi_device_name(dev)); acpigen_write_name_string("_HID", config->hid); if (config->cid) acpigen_write_name_string("_CID", config->cid); if (config->sub) acpigen_write_name_string("_SUB", config->sub); acpigen_write_name_integer("_UID", config->uid); if (config->desc) 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); /* Use either Interrupt() or GpioInt() */ if (config->irq_gpio.pin_count) irq_gpio_index = acpi_device_write_dsd_gpio(&config->irq_gpio, &curr_index); else acpi_device_write_interrupt(&config->irq); if (i2c_generic_add_gpios_to_crs(config) == true) { reset_gpio_index = acpi_device_write_dsd_gpio(&config->reset_gpio, &curr_index); enable_gpio_index = acpi_device_write_dsd_gpio(&config->enable_gpio, &curr_index); } acpigen_write_resourcetemplate_footer(); /* Wake capabilities */ if (config->wake) { acpigen_write_name_integer("_S0W", ACPI_DEVICE_SLEEP_D3_HOT); acpigen_write_PRW(config->wake, 3); } /* DSD */ if (config->probed || config->property_count || config->compat_string || (reset_gpio_index != -1) || (enable_gpio_index != -1) || (irq_gpio_index != -1)) { dsd = acpi_dp_new_table("_DSD"); if (config->compat_string) acpi_dp_add_string(dsd, "compatible", config->compat_string); if (config->probed) acpi_dp_add_integer(dsd, "linux,probed", 1); if (irq_gpio_index != -1) acpi_dp_add_gpio(dsd, "irq-gpios", path, irq_gpio_index, 0, config->irq_gpio.active_low); if (reset_gpio_index != -1) acpi_dp_add_gpio(dsd, "reset-gpios", path, reset_gpio_index, 0, config->reset_gpio.active_low); if (enable_gpio_index != -1) acpi_dp_add_gpio(dsd, "enable-gpios", path, enable_gpio_index, 0, config->enable_gpio.active_low); /* Add generic property list */ acpi_dp_add_property_list(dsd, config->property_list, config->property_count); acpi_dp_write(dsd); } /* Power Resource */ if (config->has_power_resource) { const struct acpi_power_res_params power_res_params = { &config->reset_gpio, config->reset_delay_ms, config->reset_off_delay_ms, &config->enable_gpio, config->enable_delay_ms, config->enable_off_delay_ms, &config->stop_gpio, config->stop_delay_ms, config->stop_off_delay_ms }; acpi_device_add_power_res(&power_res_params); } /* Rotation Matrix */ if (config->has_rotation_matrix) { acpigen_write_method("ROTM", 0); acpigen_write_name("RBUF"); acpigen_write_package(3); for (int i = 0; i < 3; i++) { char matrix_row[12]; snprintf(matrix_row, sizeof(matrix_row), "%d %d %d", config->rotation_matrix[i * 3 + 0], config->rotation_matrix[i * 3 + 1], config->rotation_matrix[i * 3 + 2]); acpigen_write_string(matrix_row); } acpigen_pop_len(); acpigen_write_return_namestr("RBUF"); acpigen_pop_len(); } /* Chip Direct Mapping */ if (config->cdm_index != CDM_NOT_PRESENT) { acpigen_write_method("_CDM", 1); acpigen_write_return_integer(0xabcd00 | config->cdm_index); acpigen_pop_len(); } /* Callback if any. */ if (callback) callback(dev); acpigen_pop_len(); /* Device */ acpigen_pop_len(); /* Scope */ printk(BIOS_INFO, "%s: %s at %s\n", path, config->desc ? : dev->chip_ops->name, dev_path(dev)); } static void i2c_generic_fill_ssdt_generator(const struct device *dev) { i2c_generic_fill_ssdt(dev, NULL, dev->chip_info); } /* Use name specified in config or build one from I2C address */ static const char *i2c_generic_acpi_name(const struct device *dev) { struct drivers_i2c_generic_config *config = dev->chip_info; static char name[5]; if (config->name) return config->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 = noop_read_resources, .set_resources = noop_set_resources, #if CONFIG(HAVE_ACPI_TABLES) .acpi_name = i2c_generic_acpi_name, .acpi_fill_ssdt = i2c_generic_fill_ssdt_generator, #endif }; static void i2c_generic_enable(struct device *dev) { struct drivers_i2c_generic_config *config = dev->chip_info; if (!config) return; /* 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; /* Name the device as per description provided in devicetree */ if (config->desc) dev->name = config->desc; } struct chip_operations drivers_i2c_generic_ops = { .name = "I2C Device", .enable_dev = i2c_generic_enable };