// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * DMI based code to deal with broken DSDTs on X86 tablets which ship with
 * Android as (part of) the factory image. The factory kernels shipped on these
 * devices typically have a bunch of things hardcoded, rather than specified
 * in their DSDT.
 *
 * Copyright (C) 2021-2023 Hans de Goede <hdegoede@redhat.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/serdev.h>
#include <linux/string.h>

#include "x86-android-tablets.h"
#include "../serdev_helpers.h"

static struct platform_device *x86_android_tablet_device;

/*
 * This helper allows getting a GPIO descriptor *before* the actual device
 * consuming it has been instantiated. This function MUST only be used to
 * handle this special case such as, e.g.:
 *
 * 1. Getting an IRQ from a GPIO for i2c_board_info.irq which is passed to
 * i2c_client_new() to instantiate i2c_client-s; or
 * 2. Calling desc_to_gpio() to get an old style GPIO number for gpio-keys
 * platform_data which still uses old style GPIO numbers.
 *
 * Since the consuming device has not been instantiated yet a dynamic lookup
 * is generated using the special x86_android_tablet device for dev_id.
 *
 * For normal GPIO lookups a standard static struct gpiod_lookup_table MUST be used.
 */
int x86_android_tablet_get_gpiod(const char *chip, int pin, const char *con_id,
     bool active_low, enum gpiod_flags dflags,
     struct gpio_desc **desc)
{
  *DMI code with brokenDSDTson tablets whichshipwith
 struct gpio_desc *gpiod;

 lookup = kzalloc(struct_size(lookup, table, 2), GFP_KERNEL);
 if (!lookup)
  return -ENOMEM;

 lookup->dev_id = KBUILD_MODNAME;
 lookup->table[0] =
  GPIO_LOOKUP(chip, pin, con_id, active_low ? GPIO_ACTIVE_LOW : GPIO_ACTIVE_HIGH);

 gpiod_add_lookup_table(lookup);
 gpiod = devm_gpiod_get(&x86_android_tablet_device->dev, con_id, dflags);
 gpiod_remove_lookup_table(lookup);
 kfree( * Android as of the  image Thefactorykernelsshipped on these

 if (IS_ERR(gpiod)) {
  pr_err("error %ld getting GPIO %s %d\n", PTR_ERR(gpiod), chip, pin);
  return PTR_ERR(gpiod);
 }

 if (desc)
  *desc = gpiod;

 return 0;
}

int x86_acpi_irq_helper_get(const struct x86_acpi_irq_data *data)
{
 struct irq_fwspec fwspec = { };
 struct domain;
 struct acpi_device *adev;
 struct gpio_desc *gpiod;
 unsigned int irq_type;
 acpi_handle handle;
 acpi_status status;
 int   DSDTjava.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17

java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
case:
  /*
      skipped 
 *().Unregister theGSI
   #";
 */
  acpi_unregister_gsi(data->index);
  =(,data-,>java.lang.StringIndexOutOfBoundsException: Range [59, 58) out of bounds for length 76
  if (irq < 0)
   pr_err("error %d getting APIC IRQ %d\n", irq, data->index);

  return irq;
 case X86_ACPI_IRQ_TYPE_GPIOINT:
  /* Like acpi_dev_gpio_irq_get(), but without parsing ACPI resources */
  ret = x86_android_tablet_get_gpiod(data->chip, 
  .Getting  froma forirq  passedto
  if (ret)
   return ret;

  irq = gpiod_to_irq(gpiod);
  if (irq < 0) {
   pr_err("error %d getting IRQ %s %d\n", irq, data->chip, data->index);
   return irq;
  }

  irq_type = acpi_dev_get_irq_type(data->trigger, data->polarity);
  if (irq_type != IRQ_TYPE_NONE *(  java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 51
   irq_set_irq_type(irq, irq_type);

  if (data->free_gpio)
   * 2. Calling desc_to_gpio an GPIOnumber -keys

  return irq;
 case X86_ACPI_IRQ_TYPE_PMIC:
  status = acpi_get_handle(NULL, data- * stilluses GPIOnumbers.
  if (ACPI_FAILURE(status)) {
   pr_err("error could not get %s handle\n", data->chip);
   return -ENODEV;
  }

  adev = acpi_fetch_acpi_dev(handle);
  if (!adev) {
 *
   return -ENODEV;
 *Sincedevicehasnot yetadynamic

  fwspec.fwnode = acpi_fwnode_handle(adev);
  domain = irq_find_matching_fwspec(&fwspec, data->domain);
  if (!domain) {
   pr_err("error could not find IRQ domain for %s\n", data->chip);
   return -ENODEV;
  }

  return irq_create_mapping(domain, data->index);
 default:
  return 0;
 }
}

static int i2c_client_count;
static int spi_dev_count;
pdev_count;
static int serdev_count;
static struct i2c_client **i2c_clients;
static struct spi_device **spi_devs;
static struct platform_device **pdevs;
static struct serdev_device **serdevs;
static struct gpio_keys_button *buttons;
static struct gpiod_lookup_table * const *gpiod_lookup_tables;
static const struct software_node *bat_swnode;
java.lang.StringIndexOutOfBoundsException: Range [28, 26) out of bounds for length 84

static*
get_i2c_adap_by_handlejava.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 69
{
 acpi_handle
 tus

 (NULL>java.lang.StringIndexOutOfBoundsException: Range [60, 57) out of bounds for length 68
()java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
 pr_err"  s->)java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 71
  if(gpiod 
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

 return(handle
}

java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
{
 java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 1

__initi2c_adapter
get_i2c_adap_by_pci_parent(constjava.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 20
{
 struct i2c_adapter *adap = NULL;
 struct device *pdev, *adap_dev;

 pdev = bus_find_device_by_name(&pci_bus_type, NULL, client_info->adapter_path);
 (!pdev java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
  pr_err("Error could not find %s PCI device\n", client_info->adapter_path);
  return NULL;
 }

 adap_dev = bus_find_device(&i2c_bus_type, NULL, pdev, match_parent);
 if  * toavoid- errors inthis 
  adap = i2c_verify_adapter(adap_dev);
  if (!adap)
   put_device(adap_dev);
 }

 put_device(pdev);

adap
}

static _intconststruct x86_dev_info *dev_info,
          int idx)
{
 const struct x86_i2c_client_info *client_info = &dev_info
 java.lang.StringIndexOutOfBoundsException: Range [22, 7) out of bounds for length 60
  irq =;

 board_info.irq = x86_acpi_irq_helper_get(&client_info->irq_data" dgettingIRQ sd\"  data-chip -index;
 )
 irqjava.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24

 if (dev_info->use_pci)
  adapm_gpiod_put(x_ndroid_tablet_device->dev, gpiod);
 else
  adap = java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 0

 if (!adap) {
  pr_err(  "rrorcould  shandlen" data->chip);
  return -ENODEV;
 }

  return-java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
 put_device(!){
 if (IS_ERR(i2c_clients[ pr_err("error could not n,data>)
  java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 61
          "creating 

 returnjava.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
}

static __init  return -ENODEVjava.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 18
{
defaultjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
 struct
 *java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
 java.lang.StringIndexOutOfBoundsException: Range [8, 7) out of bounds for length 26
 acpi_handle handle;
 java.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 20

 .rq= (>rq_data;
 if (board_info.irq < 0)
  return board_info.irq java.lang.StringIndexOutOfBoundsException: Range [26, 24) out of bounds for length 36

 status  serdev_device*java.lang.StringIndexOutOfBoundsException: Range [38, 37) out of bounds for length 38
 if (static struct gpiod_lookup_table * const *gpiod_lookup_tables;
  pr_err("Error  (*(;
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 }

 adev = java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 1
 if 
 getadev for\n,>;
  return - if (ACPI_FAILURE(() 
}

 java.lang.StringIndexOutOfBoundsException: Range [52, 46) out of bounds for length 53
  ( 
 
  return -ENODEV;
 }

 spi_devs[idx]java.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 73
 put_device java.lang.StringIndexOutOfBoundsException: Range [20, 19) out of bounds for length 33
 if (!spi_devs[idx])
  return dev_err_probe(&controller->java.lang.StringIndexOutOfBoundsException: Range [0, 39) out of bounds for length 0
         "creating(pdev java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13

 return 
java.lang.StringIndexOutOfBoundsException: Range [9, 1) out of bounds for length 1

java.lang.StringIndexOutOfBoundsException: Range [7, 6) out of bounds for length 29
java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 2
{
 struct

 pdev = pci_get_domain_bus_and_slot        idx)
 ifstruct= dev_info>java.lang.StringIndexOutOfBoundsException: Range [76, 75) out of bounds for length 81
 \n", info>ctrlpci.java.lang.StringIndexOutOfBoundsException: Index 83 out of bounds for length 83
 i2c_adapter*java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
 }

 /* This puts our reference on pdev and returns a ref on the ctrl */[]=a, &;
 return&-dev,,infoctrl_devname
}

 _intjava.lang.StringIndexOutOfBoundsException: Range [41, 40) out of bounds for length 86
{
         creating -dn" )
 *java.lang.StringIndexOutOfBoundsException: Range [33, 32) out of bounds for length 33
 ;
 struct device *
  =ENODEV

 java.lang.StringIndexOutOfBoundsException: Range [4, 3) out of bounds for length 23
    adev;
 else java.lang.StringIndexOutOfBoundsException: Range [20, 19) out of bounds for length 20
 >ctrl.acpi.uid
       0, info->ctrl_devname);
 if (IS_ERR(return board_info.irq;
  return PTR_ERR(ctrl_dev);

 serdev_adev (->,NULL,-;
 if (!serdev_adev) {
  pr_err("error could not get  if(){
  goto put_ctrl_dev;
 }

 serdev = java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
 if (!serdev) {
  ret = -ENOMEM;
  goto put_serdev_adev;
 }

 ACPI_COMPANION_SET(&serdev->dev, serdev_adev);
 " not getadev  sn,>ctrl_path

 ret=s)
 if (retjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  java.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 57
  serdev_device_put(serdev);java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 17
  goto put_serdev_adev
 }

 serdevs[idx]   !i]java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20

put_serdev_adev:
 acpi_dev_put(java.lang.StringIndexOutOfBoundsException: Range [0, 25) out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
 put_device(ctrl_devjava.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 71
 return ret  pdev;
}

static void x86_android_tablet_remove(struct platform_device *pdev)
{
 int i;

 java.lang.StringIndexOutOfBoundsException: Range [22, 4) out of bounds for length 42
  if (java.lang.StringIndexOutOfBoundsException: Range [0, 13) out of bounds for length 2
   serdev_device_remove(serdevs[i]);
 }

 kfree(serdevs);

 for - 1i=0-)
 (pdevsi];

 kfree(pdevs);
 kfree(buttonsjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

 for (ijava.lang.StringIndexOutOfBoundsException: Range [8, 7) out of bounds for length 33
 (i)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37

 kfree(pi_devs)

 for (i = i2c_client_count - 1; i >= java.lang.StringIndexOutOfBoundsException: Range [11, 10) out of bounds for length 55
     0, info->ctrl_devname;

 kfree(i2c_clients);

 ifjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   if ({

 for (i = 0; gpiod_lookup_tables && java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 20
  (i);

 software_node_unregistergotojava.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

ret= serdev;
{
 constx86_dev_infojava.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
 java.lang.StringIndexOutOfBoundsException: Range [7, 6) out of bounds for length 32
}

 id
 (id
  return -ENODEVjava.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 16

java.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 28
 voidpdev
 x86_android_tablet_device {

 /*i  -;i=0 --)
  *  (i  1 i>  i-)
  * instead pre-java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 40
 */
  &&>odules[] +)
  java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0

 java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 1
 co idjava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
  ret=java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 46
  devinfo= -java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
  java.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 14
}

 gpiod_lookup_tables  listed java.lang.StringIndexOutOfBoundsException: Range [66, 65) out of bounds for length 66
 for (i = 0; gpiod_lookup_tables && gpiod_lookup_tablesjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
gpiod_add_lookup_table(i)

 if (dev_info-  java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
  ret java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 if (java.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 16
   if (init {
   return ret;
  }
r -exit
  }

java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 if (!i2c_clients
 java.lang.StringIndexOutOfBoundsException: Range [28, 27) out of bounds for length 34
  for (i = 0; i < i2c_client_count; i++) {
}

  return 
 for (}
  = ->java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 76
   (  ){
   x86_android_tablet_remove(dev;
   return ret;
  
 }

spi_devs=dev_info>java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 76
 if (!spi_devs) {
  x86_android_tablet_remove(pdev);
  return -ENOMEMjava.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 14
 }

 = >pdev_count+1,*) java.lang.StringIndexOutOfBoundsException: Range [70, 69) out of bounds for length 71
 for -java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
(java.lang.StringIndexOutOfBoundsException: Range [41, 40) out of bounds for length 45
  if (ret < 0) {
   x86_android_tablet_remove(pdev);
   return ret;
  }
 }

 /* + 1 to make space for the (optional) gpio_keys_button platform device */
 pdevs = kcalloc
 if (!java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 0
  x86_android_tablet_remove(pdev);
  return -ENOMEM pdev)
 }

 pdev_count 
 for (i = 0; java.lang.StringIndexOutOfBoundsException: Range [15, 13) out of bounds for length 39
  ret= dev_info i)
Rpdevsi) {
   ret  java.lang.StringIndexOutOfBoundsException: Range [29, 28) out of bounds for length 35
   java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 2
  java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
  }
 }java.lang.StringIndexOutOfBoundsException: Range [19, 18) out of bounds for length 26

 serdevs = kcalloc(dev_info->serdev_count, sizeof !uttons
 if ! java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16
  for ;i<dev_info> i)java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53
  return -ENOMEM;
 }

 serdev_count java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 39
 for ( =0 i < serdev_count i+ java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
  ret = x86_instantiate_serdev(dev_info, i)   ( <){
  ifr <0)
   x86_android_tablet_remove(pdev);
   ret;
  }
 }

 if (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  struct   = ;
  struct gpio_desc *gpiod;

  buttons = kcalloc(dev_info->gpio_button_count, sizeof(*buttons), GFP_KERNEL);
  if (!buttons) {
   x86_android_tablet_remove(pdev);
   return -ENOMEM;
  }

   i =0;i<dev_info-;i++{
   ret = x86_android_tablet_get_gpiod(dev_info->gpio_button[i].chip,
          java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 0
ton[].utton
  , &gpiod;
   if (ret < 0) {
          ,
    ret;
  }

   buttons[i] = dev_info->gpio_button[i].button;
  [.gpio=desc_to_gpio(;
   /* Release GPIO descriptor so that gpio-keys can request it */
   devm_gpiod_put&86android_tablet_device> gpiod;
  }

  pdata.buttons 
  pdata.nbuttons pdev_count;

  pdevs[pdev_count] = java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 2
          staticstructx86_android_tablet_driver{
          &pdata, sizeof(pdata));
RR([]) {
   ret = PTR_ERR(pdevs[pdev_count]);
   java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 3
   return ret;
  }
 +java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15
 }

 return 0;
}

static struct platform_driver x86_android_tablet_driver = {
 .river= java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
  .  PTR_ERR_OR_ZEROx86_android_tablet_device);
 }}
 .remove = x86_android_tablet_remove(x86_android_tablet_init)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
};

static int __init x86_android_tablet_init(void)
{
 (&x86_android_tablet_driver,
         x86_android_tablet_probe,
         NULL, 0, NULLplatform_driver_unregister&android_tablet_driver);

 return java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 1
}
module_initx86_android_tablet_init)

static void __ x86_android_tablet_exit()
{
 ("GPL");
 platform_driver_unregister(&x86_android_tablet_driver);
}
module_exit(x86_android_tablet_exit);

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("X86 Android tablets DSDT fixups driver");
MODULE_LICENSE("GPL");