Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid

Pull HID updates from Jiri Kosina:

 - Valve Steam Controller support from Rodrigo Rivas Costa

 - Redragon Asura support from Robert Munteanu

 - improvement of duplicate usage handling in generic hid-input from
   Benjamin Tissoires

 - Win 8.1 precisioun touchpad spec implementation from Benjamin
   Tissoires

 - Support for "In Range" flag for Wacom Intuos/Bamboo devices from
   Jason Gerecke

 - other various assorted smaller fixes and improvements

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (27 commits)
  HID: rmi: use HID_QUIRK_NO_INPUT_SYNC
  HID: multitouch: fix calculation of last slot field in multi-touch reports
  HID: quirks: remove Delcom Visual Signal Indicator from hid_have_special_driver[]
  HID: steam: select CONFIG_POWER_SUPPLY
  HID: i2c-hid: remove i2c_hid_open_mut
  HID: wacom: Support "in range" for Intuos/Bamboo tablets where possible
  HID: core: fix hid_hw_open() comment
  HID: hid-plantronics: Re-resend Update to map button for PTT products
  HID: multitouch: fix types returned from mt_need_to_apply_feature()
  HID: i2c-hid: check if device is there before really probing
  HID: steam: add missing fields in client initialization
  HID: steam: add battery device.
  HID: add driver for Valve Steam Controller
  HID: alps: Fix some style in 't4_read_write_register()'
  HID: alps: Check errors returned by 't4_read_write_register()'
  HID: alps: Save a memory allocation in 't4_read_write_register()' when writing data
  HID: alps: Report an error if we receive invalid data in 't4_read_write_register()'
  HID: multitouch: implement precision touchpad latency and switches
  HID: multitouch: simplify the settings of the various features
  HID: multitouch: make use of HID_QUIRK_INPUT_PER_APP
  ...

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;