src/mainboard/google/octopus/variants/bobba/variant.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2018 Google LLC.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <arch/acpi_device.h>
  17 #include <baseboard/variants.h>
  18 #include <boardid.h>
  19 #include <device/device.h>
  20 #include <drivers/i2c/generic/chip.h>
  21 #include <drivers/i2c/hid/chip.h>
  22 #include <soc/gpio.h>
  23 #include <soc/pci_devs.h>
  24 #include <string.h>
  25
  26 extern struct chip_operations drivers_i2c_generic_ops;
  27 extern struct chip_operations drivers_i2c_hid_ops;
  28
  29 void variant_update_devtree(struct device *dev)
  30 {
  31         uint32_t bid;
  32         struct device *touchscreen_i2c_host;
  33         struct device *child;
  34         const struct bus *children_bus;
  35         static const struct acpi_gpio new_enable_gpio =
  36                 ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_146);
  37
  38         bid = board_id();
  39
  40         /* Nothing to update. */
  41         if (bid == UNDEFINED_STRAPPING_ID || bid < 1)
  42                 return;
  43
  44         touchscreen_i2c_host = dev_find_slot(0, PCH_DEVFN_I2C7);
  45
  46         if (touchscreen_i2c_host == NULL)
  47                 return;
  48
  49         children_bus = touchscreen_i2c_host->link_list;
  50         child = NULL;
  51
  52         /* Find all children on bus to update touchscreen enable gpio. */
  53         while ((child = dev_bus_each_child(children_bus, child)) != NULL) {
  54                 struct drivers_i2c_generic_config *cfg;
  55
  56                 /* No configration to change. */
  57                 if (child->chip_info == NULL)
  58                         continue;
  59
  60                 if (child->chip_ops == &drivers_i2c_generic_ops)
  61                         cfg = child->chip_info;
  62                 else if (child->chip_ops == &drivers_i2c_hid_ops) {
  63                         struct drivers_i2c_hid_config *hid_cfg;
  64                         hid_cfg = child->chip_info;
  65                         cfg = &hid_cfg->generic;
  66                 } else
  67                         continue;
  68
  69                 /* Update the enable gpio. */
  70                 memcpy(&cfg->enable_gpio, &new_enable_gpio,
  71                         sizeof(new_enable_gpio));
  72         }
  73 }