greybus: svc: remove input device handling in SVC protocol

The input device was added before to handle the key(s) connected
directly to SVC, which is not the case anymore. So, this change removes
the gb_svc_key_event() operation and the corresponding input device
code with it.

Testing Done:
Boot tested and tried module insert/removal through AraManager

Change-Id: Iaa541d4aefb5c0ed16caaa39450029de35d7c228
Signed-off-by: Sandeep Patil <sspatil@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/svc.c

@@ -8,13 +8,10 @@
  */
 
 #include <linux/debugfs.h>
-#include <linux/input.h>
 #include <linux/workqueue.h>
 
 #include "greybus.h"
 
-#define SVC_KEY_ARA_BUTTON	KEY_A
-
 #define SVC_INTF_EJECT_TIMEOUT		9000
 #define SVC_INTF_ACTIVATE_TIMEOUT	6000
 
@@ -887,13 +884,6 @@ static int gb_svc_hello(struct gb_operation *op)
 		return ret;
 	}
 
-	ret = input_register_device(svc->input);
-	if (ret) {
-		dev_err(&svc->dev, "failed to register input: %d\n", ret);
-		device_del(&svc->dev);
-		return ret;
-	}
-
 	ret = gb_svc_watchdog_create(svc);
 	if (ret) {
 		dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
@@ -913,7 +903,6 @@ static int gb_svc_hello(struct gb_operation *op)
 
 err_unregister_device:
 	gb_svc_watchdog_destroy(svc);
-	input_unregister_device(svc->input);
 	device_del(&svc->dev);
 	return ret;
 }
@@ -1160,53 +1149,6 @@ static int gb_svc_intf_reset_recv(struct gb_operation *op)
 	return 0;
 }
 
-static int gb_svc_key_code_map(struct gb_svc *svc, u16 key_code, u16 *code)
-{
-	switch (key_code) {
-	case GB_KEYCODE_ARA:
-		*code = SVC_KEY_ARA_BUTTON;
-		break;
-	default:
-		dev_warn(&svc->dev, "unknown keycode received: %u\n", key_code);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int gb_svc_key_event_recv(struct gb_operation *op)
-{
-	struct gb_svc *svc = gb_connection_get_data(op->connection);
-	struct gb_message *request = op->request;
-	struct gb_svc_key_event_request *key;
-	u16 code;
-	u8 event;
-	int ret;
-
-	if (request->payload_size < sizeof(*key)) {
-		dev_warn(&svc->dev, "short key request received (%zu < %zu)\n",
-			 request->payload_size, sizeof(*key));
-		return -EINVAL;
-	}
-
-	key = request->payload;
-
-	ret = gb_svc_key_code_map(svc, le16_to_cpu(key->key_code), &code);
-	if (ret < 0)
-		return ret;
-
-	event = key->key_event;
-	if ((event != GB_SVC_KEY_PRESSED) && (event != GB_SVC_KEY_RELEASED)) {
-		dev_warn(&svc->dev, "unknown key event received: %u\n", event);
-		return -EINVAL;
-	}
-
-	input_report_key(svc->input, code, (event == GB_SVC_KEY_PRESSED));
-	input_sync(svc->input);
-
-	return 0;
-}
-
 static int gb_svc_module_inserted_recv(struct gb_operation *op)
 {
 	struct gb_svc *svc = gb_connection_get_data(op->connection);
@@ -1314,8 +1256,6 @@ static int gb_svc_request_handler(struct gb_operation *op)
 		return ret;
 	case GB_SVC_TYPE_INTF_RESET:
 		return gb_svc_intf_reset_recv(op);
-	case GB_SVC_TYPE_KEY_EVENT:
-		return gb_svc_key_event_recv(op);
 	case GB_SVC_TYPE_MODULE_INSERTED:
 		return gb_svc_module_inserted_recv(op);
 	case GB_SVC_TYPE_MODULE_REMOVED:
@@ -1328,34 +1268,6 @@ static int gb_svc_request_handler(struct gb_operation *op)
 	}
 }
 
-static struct input_dev *gb_svc_input_create(struct gb_svc *svc)
-{
-	struct input_dev *input_dev;
-
-	input_dev = input_allocate_device();
-	if (!input_dev)
-		return ERR_PTR(-ENOMEM);
-
-	input_dev->name = dev_name(&svc->dev);
-	svc->input_phys = kasprintf(GFP_KERNEL, "greybus-%s/input0",
-				    input_dev->name);
-	if (!svc->input_phys)
-		goto err_free_input;
-
-	input_dev->phys = svc->input_phys;
-	input_dev->dev.parent = &svc->dev;
-
-	input_set_drvdata(input_dev, svc);
-
-	input_set_capability(input_dev, EV_KEY, SVC_KEY_ARA_BUTTON);
-
-	return input_dev;
-
-err_free_input:
-	input_free_device(input_dev);
-	return ERR_PTR(-ENOMEM);
-}
-
 static void gb_svc_release(struct device *dev)
 {
 	struct gb_svc *svc = to_gb_svc(dev);
@@ -1364,7 +1276,6 @@ static void gb_svc_release(struct device *dev)
 		gb_connection_destroy(svc->connection);
 	ida_destroy(&svc->device_id_map);
 	destroy_workqueue(svc->wq);
-	kfree(svc->input_phys);
 	kfree(svc);
 }
 
@@ -1400,27 +1311,18 @@ struct gb_svc *gb_svc_create(struct gb_host_device *hd)
 	svc->state = GB_SVC_STATE_RESET;
 	svc->hd = hd;
 
-	svc->input = gb_svc_input_create(svc);
-	if (IS_ERR(svc->input)) {
-		dev_err(&svc->dev, "failed to create input device: %ld\n",
-			PTR_ERR(svc->input));
-		goto err_put_device;
-	}
-
 	svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
 						gb_svc_request_handler);
 	if (IS_ERR(svc->connection)) {
 		dev_err(&svc->dev, "failed to create connection: %ld\n",
 				PTR_ERR(svc->connection));
-		goto err_free_input;
+		goto err_put_device;
 	}
 
 	gb_connection_set_data(svc->connection, svc);
 
 	return svc;
 
-err_free_input:
-	input_free_device(svc->input);
 err_put_device:
 	put_device(&svc->dev);
 	return NULL;
@@ -1459,14 +1361,12 @@ void gb_svc_del(struct gb_svc *svc)
 	gb_connection_disable_rx(svc->connection);
 
 	/*
-	 * The SVC device and input device may have been registered
-	 * from the request handler.
+	 * The SVC device may have been registered from the request handler.
 	 */
 	if (device_is_registered(&svc->dev)) {
 		gb_timesync_svc_remove(svc);
 		gb_svc_debugfs_exit(svc);
 		gb_svc_watchdog_destroy(svc);
-		input_unregister_device(svc->input);
 		device_del(&svc->dev);
 	}
 

drivers/staging/greybus/svc.h

@@ -42,8 +42,6 @@ struct gb_svc {
 	u8 protocol_major;
 	u8 protocol_minor;
 
-	struct input_dev        *input;
-	char                    *input_phys;
 	struct gb_svc_watchdog	*watchdog;
 
 	struct dentry *debugfs_dentry;