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usb: ljca: Improve ACPI hardware ID documentation

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Document the differences between the LJCA client device ACPI hardware IDs,
including the USBIO IDs used for LJCA devices.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Hans de Goede <hansg@kernel.org>
Link: https://lore.kernel.org/r/20251010055625.4147844-2-sakari.ailus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sakari Ailus
2025-10-10 08:56:25 +03:00
committed by Greg Kroah-Hartman
parent 9f0b086cd5
commit 877c80dfbf
1 changed files with 24 additions and 13 deletions
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37
drivers/usb/misc/usb-ljca.c
View File

@@ -164,28 +164,39 @@ struct ljca_match_ids_walk_data {
struct acpi_device *adev;
};
/*
* ACPI hardware IDs for LJCA client devices.
*
* [1] Some BIOS implementations use these IDs for denoting LJCA client devices
* even though the IDs have been allocated for USBIO. This isn't a problem
* as the usb-ljca driver is probed based on the USB device's vendor and
* product IDs and its client drivers are probed based on auxiliary device
* names, not these ACPI _HIDs. List of such systems:
*
* Dell Precision 5490
*/
static const struct acpi_device_id ljca_gpio_hids[] = {
{ "INTC100B" },
{ "INTC1074" },
{ "INTC1096" },
{ "INTC10B5" },
{ "INTC10D1" },
{ "INTC100B" }, /* RPL LJCA GPIO */
{ "INTC1074" }, /* CVF LJCA GPIO */
{ "INTC1096" }, /* ADL LJCA GPIO */
{ "INTC10B5" }, /* LNL LJCA GPIO */
{ "INTC10D1" }, /* MTL (CVF VSC) USBIO GPIO [1] */
{},
};
static const struct acpi_device_id ljca_i2c_hids[] = {
{ "INTC100C" },
{ "INTC1075" },
{ "INTC1097" },
{ "INTC10D2" },
{ "INTC100C" }, /* RPL LJCA I2C */
{ "INTC1075" }, /* CVF LJCA I2C */
{ "INTC1097" }, /* ADL LJCA I2C */
{ "INTC10D2" }, /* MTL (CVF VSC) USBIO I2C [1] */
{},
};
static const struct acpi_device_id ljca_spi_hids[] = {
{ "INTC100D" },
{ "INTC1091" },
{ "INTC1098" },
{ "INTC10D3" },
{ "INTC100D" }, /* RPL LJCA SPI */
{ "INTC1091" }, /* TGL/ADL LJCA SPI */
{ "INTC1098" }, /* ADL LJCA SPI */
{ "INTC10D3" }, /* MTL (CVF VSC) USBIO SPI [1] */
{},
};