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/* 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 <stdio.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 = {
.name = "I2C HID Device",
.enable_dev = i2c_hid_enable
};
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