Merge branch 'for-4.18/i2c-hid' into for-linus

Assorted smaller fixes to i2c-hid driver

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index cc33622..c1652bb 100644 (file)
--- 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;