diff options
| -rw-r--r-- | drivers/hid/i2c-hid/i2c-hid.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index cc33622253aa..c1652bb7bd15 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -131,8 +131,6 @@ static const struct i2c_hid_cmd hid_no_cmd = { .length = 0 }; * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) }; */ -static DEFINE_MUTEX(i2c_hid_open_mut); - /* The main device structure */ struct i2c_hid { struct i2c_client *client; /* i2c client */ @@ -868,6 +866,15 @@ 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) { @@ -879,13 +886,18 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client, acpi_handle handle; handle = ACPI_HANDLE(&client->dev); - if (!handle || acpi_bus_get_device(handle, &adev)) + if (!handle || acpi_bus_get_device(handle, &adev)) { + dev_err(&client->dev, "Error could not get ACPI device\n"); + 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) { - dev_err(&client->dev, "device _DSM execution failed\n"); + dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n"); return -ENODEV; } @@ -1000,11 +1012,8 @@ static int i2c_hid_probe(struct i2c_client *client, goto err; } else if (!platform_data) { ret = i2c_hid_acpi_pdata(client, &ihid->pdata); - if (ret) { - dev_err(&client->dev, - "HID register address not provided\n"); + if (ret) goto err; - } } else { ihid->pdata = *platform_data; } @@ -1054,6 +1063,14 @@ static int i2c_hid_probe(struct i2c_client *client, pm_runtime_enable(&client->dev); device_enable_async_suspend(&client->dev); + /* Make sure there is something at this address */ + ret = i2c_smbus_read_byte(client); + if (ret < 0) { + dev_dbg(&client->dev, "nothing at this address: %d\n", ret); + ret = -ENXIO; + goto err_pm; + } + ret = i2c_hid_fetch_hid_descriptor(ihid); if (ret < 0) goto err_pm; |