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-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c33
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;