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platform/x86: x86-android-tablets: Add support for getting i2c_adapter by PCI parent devname()

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On the Vexia EDU ATLA 10 tablet, which ships with Android + a custom Linux
(guadalinex) using the custom Android kernel the I2C controllers are not
enumerated as ACPI devices as they typically are.

Instead they are enumerated as PCI devices which do not have ACPI firmware
nodes associated with them, so getting the i2c_adapter by the ACPI path of
its firmware node does not work.

Add support for getting the i2c_adapter by the devname() of its PCI parent
instead.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20241104200848.58693-3-hdegoede@redhat.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Hans de Goede 2024-11-04 21:08:47 +01:00 • committed by Ilpo Järvinen
parent 01fbfcb3ac
commit 5b78e809f9
No known key found for this signature in database
GPG key ID: 59AC4F6153E5CE31
3 changed files with 40 additions and 2 deletions
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4
drivers/platform/x86/x86-android-tablets/Kconfig
View file

@ -5,7 +5,9 @@
config X86_ANDROID_TABLETS
tristate "X86 Android tablet support"
depends on I2C && SPI && SERIAL_DEV_BUS && ACPI && EFI && GPIOLIB && PMIC_OPREGION
depends on I2C && SPI && SERIAL_DEV_BUS
depends on GPIOLIB && PMIC_OPREGION
depends on ACPI && EFI && PCI
select NEW_LEDS
select LEDS_CLASS
help

37
drivers/platform/x86/x86-android-tablets/core.c
View file

@ -11,11 +11,13 @@
#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>
@ -170,6 +172,35 @@ get_i2c_adap_by_handle(const struct x86_i2c_client_info *client_info)
return i2c_acpi_find_adapter_by_handle(handle);
}
static __init int match_parent(struct device *dev, const void *data)
{
return dev->parent == data;
}
static struct i2c_adapter *
get_i2c_adap_by_pci_parent(const struct x86_i2c_client_info *client_info)
{
struct i2c_adapter *adap = NULL;
struct device *pdev, *adap_dev;
pdev = bus_find_device_by_name(&pci_bus_type, NULL, client_info->adapter_path);
if (!pdev) {
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 (adap_dev) {
adap = i2c_verify_adapter(adap_dev);
if (!adap)
put_device(adap_dev);
}
put_device(pdev);
return adap;
}
static __init int x86_instantiate_i2c_client(const struct x86_dev_info *dev_info,
int idx)
{
@ -181,7 +212,11 @@ static __init int x86_instantiate_i2c_client(const struct x86_dev_info *dev_info
if (board_info.irq < 0)
return board_info.irq;
adap = get_i2c_adap_by_handle(client_info);
if (dev_info->use_pci_devname)
adap = get_i2c_adap_by_pci_parent(client_info);
else
adap = get_i2c_adap_by_handle(client_info);
if (!adap) {
pr_err("error could not get %s adapter\n", client_info->adapter_path);
return -ENODEV;

1
drivers/platform/x86/x86-android-tablets/x86-android-tablets.h
View file

@ -91,6 +91,7 @@ struct x86_dev_info {
int gpio_button_count;
int (*init)(struct device *dev);
void (*exit)(void);
bool use_pci_devname;
};
int x86_android_tablet_get_gpiod(const char *chip, int pin, const char *con_id,