[media] ir-kbd-i2c: add rc_dev as a parameter to the driver

There are several fields on rc_dev that drivers can benefit. Allow drivers
to pass it as a parameter to the driver.

For now, the rc_dev parameter is optional. If drivers don't pass it, create
them internally. However, the best is to create rc_dev inside the drivers,
in order to fill other fields, like open(), close(), driver_name, etc.
So, a latter patch making it mandatory and changing the caller drivers is
welcome.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/ir-kbd-i2c.c

@@ -271,20 +271,16 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	const char *name = NULL;
 	u64 ir_type = IR_TYPE_UNKNOWN;
 	struct IR_i2c *ir;
-	struct rc_dev *rc;
+	struct rc_dev *rc = NULL;
 	struct i2c_adapter *adap = client->adapter;
 	unsigned short addr = client->addr;
 	int err;
 
-	ir = kzalloc(sizeof(struct IR_i2c),GFP_KERNEL);
-	rc = rc_allocate_device();
-	if (!ir || !rc) {
-		err = -ENOMEM;
-		goto err_out_free;
-	}
+	ir = kzalloc(sizeof(struct IR_i2c), GFP_KERNEL);
+	if (!ir)
+		return -ENOMEM;
 
 	ir->c = client;
-	ir->rc = rc;
 	ir->polling_interval = DEFAULT_POLLING_INTERVAL;
 	i2c_set_clientdata(client, ir);
 
@@ -333,6 +329,8 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 						client->dev.platform_data;
 
 		ir_codes = init_data->ir_codes;
+		rc = init_data->rc_dev;
+
 		name = init_data->name;
 		if (init_data->type)
 			ir_type = init_data->type;
@@ -366,6 +364,19 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		}
 	}
 
+	if (!rc) {
+		/*
+		 * If platform_data doesn't specify rc_dev, initilize it
+		 * internally
+		 */
+		rc = rc_allocate_device();
+		if (!rc) {
+			err = -ENOMEM;
+			goto err_out_free;
+		}
+	}
+	ir->rc = rc;
+
 	/* Make sure we are all setup before going on */
 	if (!name || !ir->get_key || !ir_type || !ir_codes) {
 		dprintk(1, ": Unsupported device at address 0x%02x\n",
@@ -382,12 +393,21 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		 dev_name(&adap->dev),
 		 dev_name(&client->dev));
 
-	/* init + register input device */
+	/*
+	 * Initialize input_dev fields
+	 * It doesn't make sense to allow overriding them via platform_data
+	 */
 	rc->input_id.bustype = BUS_I2C;
-	rc->input_name       = ir->name;
 	rc->input_phys       = ir->phys;
-	rc->map_name         = ir->ir_codes;
-	rc->driver_name      = MODULE_NAME;
+	rc->input_name	     = ir->name;
+
+	/*
+	 * Initialize the other fields of rc_dev
+	 */
+	rc->map_name       = ir->ir_codes;
+	rc->allowed_protos = ir_type;
+	if (!rc->driver_name)
+		rc->driver_name = MODULE_NAME;
 
 	err = rc_register_device(rc);
 	if (err)
@@ -403,6 +423,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	return 0;
 
  err_out_free:
+	/* Only frees rc if it were allocated internally */
 	rc_free_device(rc);
 	kfree(ir);
 	return err;

include/media/ir-kbd-i2c.h

@@ -46,5 +46,7 @@ struct IR_i2c_init_data {
 	 */
 	int                    (*get_key)(struct IR_i2c*, u32*, u32*);
 	enum ir_kbd_get_key_fn internal_get_key_func;
+
+	struct rc_dev		*rc_dev;
 };
 #endif