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HID: i2c-hid: Silently fail probe for CHPN0001 touchscreen 

The CHPN0001 ACPI device has a _CID of PNP0C50 and even has the _DSM to
get the HID descriptor address, but it is not a HID device at all.

It uses its own protocol which is handled by the (still being upstreamed)
chipone_icn8505 driver. I guess the _CID and the _DSM are the result of
a copy and paste job when the vendor was building the ACPI tables.

Before this patch the i2c_hid_driver's probe function will fail with a
"hid_descr_cmd failed" error.

This commit makes the i2c_hid_driver's probe function instead silently
ignored devices with an ACPI id of CHPN0001.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Hans de Goede 2018-04-03 15:16:34 +02:00 committed by Jiri Kosina
parent 67767a5f7c
commit 2dcc8197fe
1 changed files with 12 additions and 0 deletions
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12
drivers/hid/i2c-hid/i2c-hid.c
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@ -863,6 +863,15 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
}
#ifdef CONFIG_ACPI
static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
/*
* The CHPN0001 ACPI device, which is used to describe the Chipone
* ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
*/
{"CHPN0001", 0 },
{ },
};
static int i2c_hid_acpi_pdata(struct i2c_client *client,
struct i2c_hid_platform_data *pdata)
{
@ -879,6 +888,9 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
return -ENODEV;
}
if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
return -ENODEV;
obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
ACPI_TYPE_INTEGER);
if (!obj) {