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/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google LLC.
*
* 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 <baseboard/variants.h>
#include <boardid.h>
#include <device/device.h>
#include <drivers/i2c/generic/chip.h>
#include <drivers/i2c/hid/chip.h>
#include <soc/gpio.h>
#include <soc/pci_devs.h>
#include <string.h>
extern struct chip_operations drivers_i2c_generic_ops;
extern struct chip_operations drivers_i2c_hid_ops;
void variant_update_devtree(struct device *dev)
{
uint32_t bid;
struct device *touchscreen_i2c_host;
struct device *child;
const struct bus *children_bus;
static const struct acpi_gpio new_enable_gpio =
ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_146);
bid = board_id();
/* Nothing to update. */
if (bid == UNDEFINED_STRAPPING_ID || bid < 2)
return;
touchscreen_i2c_host = dev_find_slot(0, PCH_DEVFN_I2C7);
if (touchscreen_i2c_host == NULL)
return;
children_bus = touchscreen_i2c_host->link_list;
child = NULL;
/* Find all children on bus to update touchscreen enable gpio. */
while ((child = dev_bus_each_child(children_bus, child)) != NULL) {
struct drivers_i2c_generic_config *cfg;
/* No configration to change. */
if (child->chip_info == NULL)
continue;
if (child->chip_ops == &drivers_i2c_generic_ops)
cfg = child->chip_info;
else if (child->chip_ops == &drivers_i2c_hid_ops) {
struct drivers_i2c_hid_config *hid_cfg;
hid_cfg = child->chip_info;
cfg = &hid_cfg->generic;
} else
continue;
/* Update the enable gpio. */
memcpy(&cfg->enable_gpio, &new_enable_gpio,
sizeof(new_enable_gpio));
}
}
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