/* SPDX-License-Identifier: GPL-2.0-only */ #include <acpi/acpigen_dsm.h> #include <acpi/acpi_device.h> #include <assert.h> #include <device/device.h> #include <string.h> #include "chip.h" #include <gpio.h> #include <console/console.h> #if CONFIG(HAVE_ACPI_TABLES) static void i2c_hid_fill_dsm(const struct device *dev) { struct drivers_i2c_hid_config *config = dev->chip_info; struct dsm_i2c_hid_config dsm_config = { .hid_desc_reg_offset = config->hid_desc_reg_offset, }; acpigen_write_dsm_i2c_hid(&dsm_config); } static void i2c_hid_fill_ssdt_generator(const struct device *dev) { struct drivers_i2c_hid_config *config = dev->chip_info; config->generic.cid = I2C_HID_CID; i2c_generic_fill_ssdt(dev, &i2c_hid_fill_dsm, &config->generic); } static const char *i2c_hid_acpi_name(const struct device *dev) { static char name[5]; struct drivers_i2c_hid_config *config = dev->chip_info; if (config->generic.name) return config->generic.name; snprintf(name, sizeof(name), "H%03.3X", dev->path.i2c.device); name[4] = '\0'; return name; } #endif static struct device_operations i2c_hid_ops = { .read_resources = noop_read_resources, .set_resources = noop_set_resources, #if CONFIG(HAVE_ACPI_TABLES) .acpi_name = i2c_hid_acpi_name, .acpi_fill_ssdt = i2c_hid_fill_ssdt_generator, #endif }; static void i2c_hid_enable(struct device *dev) { struct drivers_i2c_hid_config *config = dev->chip_info; if (!config) return; /* Check if device is present by reading GPIO */ if (config->generic.device_present_gpio) { int present = gpio_get(config->generic.device_present_gpio); present ^= config->generic.device_present_gpio_invert; printk(BIOS_INFO, "%s is %spresent\n", dev->chip_ops->name, present ? "" : "not "); if (!present) { dev->enabled = 0; return; } } /* * Ensure that I2C HID devices use level triggered interrupts as per ACPI * I2C HID requirement. Check interrupt and GPIO interrupt. */ if ((!config->generic.irq_gpio.pin_count && config->generic.irq.mode != ACPI_IRQ_LEVEL_TRIGGERED) || (config->generic.irq_gpio.pin_count && config->generic.irq_gpio.irq.mode != ACPI_IRQ_LEVEL_TRIGGERED)) { printk(BIOS_ERR, "%s IRQ is not level triggered.\n", config->generic.hid); BUG(); } dev->ops = &i2c_hid_ops; if (config && config->generic.desc) { dev->name = config->generic.desc; } } struct chip_operations drivers_i2c_hid_ops = { CHIP_NAME("I2C HID Device") .enable_dev = i2c_hid_enable };