V4L/DVB (13637): em28xx: allow changing keycode table protocol

Experimental patch to allow changing the IR protocol. Currently, it support
changing between RC-5 and NEC protocols.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 54 insertions, 26 deletions

diff --git a/drivers/media/video/em28xx/em28xx-input.c b/drivers/media/video/em28xx/em28xx-input.c
index fbfbab6841cd..ebb75a867f03 100644
--- a/drivers/media/video/em28xx/em28xx-input.c
+++ b/drivers/media/video/em28xx/em28xx-input.c
@@ -75,6 +75,10 @@ struct em28xx_IR {
         unsigned int repeat_interval;
 
         int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
+
+        /* IR device properties */
+
+        struct ir_dev_props props;
 };
 
 /**********************************************************
@@ -336,35 +340,25 @@ static void em28xx_ir_stop(struct em28xx_IR *ir)
         cancel_delayed_work_sync(&ir->work);
 }
 
-int em28xx_ir_init(struct em28xx *dev)
+int em28xx_ir_change_protocol(void *priv, enum ir_type ir_type)
 {
-        struct em28xx_IR *ir;
-        struct input_dev *input_dev;
-        u8 ir_config;
-        int err = -ENOMEM;
-
-        if (dev->board.ir_codes == NULL) {
-                /* No remote control support */
-                return 0;
-        }
-
-        ir = kzalloc(sizeof(*ir), GFP_KERNEL);
-        input_dev = input_allocate_device();
-        if (!ir || !input_dev)
-                goto err_out_free;
-
-        ir->input = input_dev;
-        ir_config = EM2874_IR_RC5;
+        int rc = 0;
+        struct em28xx_IR *ir = priv;
+        struct em28xx *dev = ir->dev;
+        u8 ir_config = EM2874_IR_RC5;
 
         /* Adjust xclk based o IR table for RC5/NEC tables */
-        if (dev->board.ir_codes->ir_type == IR_TYPE_RC5) {
+
+        if (ir_type == IR_TYPE_RC5) {
                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
                 ir->full_code = 1;
-        } else  if (dev->board.ir_codes->ir_type == IR_TYPE_NEC) {
+        } else if (ir_type == IR_TYPE_NEC) {
                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
                 ir_config = EM2874_IR_NEC;
                 ir->full_code = 1;
-        }
+        } else
+                rc = -EINVAL;
+
         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
                               EM28XX_XCLK_IR_RC5_MODE);
 
@@ -380,9 +374,42 @@ int em28xx_ir_init(struct em28xx *dev)
                 break;
         default:
                 printk("Unrecognized em28xx chip id: IR not supported\n");
-                goto err_out_free;
+                rc = -EINVAL;
+        }
+
+        return rc;
+}
+
+int em28xx_ir_init(struct em28xx *dev)
+{
+        struct em28xx_IR *ir;
+        struct input_dev *input_dev;
+        int err = -ENOMEM;
+
+        if (dev->board.ir_codes == NULL) {
+                /* No remote control support */
+                return 0;
         }
 
+        ir = kzalloc(sizeof(*ir), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!ir || !input_dev)
+                goto err_out_free;
+
+        /* record handles to ourself */
+        ir->dev = dev;
+        dev->ir = ir;
+
+        ir->input = input_dev;
+
+        /*
+         * em2874 supports more protocols. For now, let's just announce
+         * the two protocols that were already tested
+         */
+        ir->props.allowed_protos = IR_TYPE_RC5 | IR_TYPE_NEC;
+        ir->props.priv = ir;
+        ir->props.change_protocol = em28xx_ir_change_protocol;
+
         /* This is how often we ask the chip for IR information */
         ir->polling = 100; /* ms */
 
@@ -393,6 +420,8 @@ int em28xx_ir_init(struct em28xx *dev)
         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 
+        /* Set IR protocol */
+        em28xx_ir_change_protocol(ir, dev->board.ir_codes->ir_type);
         err = ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER);
         if (err < 0)
                 goto err_out_free;
@@ -405,14 +434,13 @@ int em28xx_ir_init(struct em28xx *dev)
         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 
         input_dev->dev.parent = &dev->udev->dev;
-        /* record handles to ourself */
-        ir->dev = dev;
-        dev->ir = ir;
+
 
         em28xx_ir_start(ir);
 
         /* all done */
-        err = ir_input_register(ir->input, dev->board.ir_codes, NULL);
+        err = ir_input_register(ir->input, dev->board.ir_codes,
+                                &ir->props);
         if (err)
                 goto err_out_stop;