| /* 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 |
| }; |