media: rc: imon decoder: support the stick

The iMON PAD controller has a analog stick, which can be switched to
keyboard mode (cursor keys) or work as a crappy mouse.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/rc/ir-imon-decoder.c b/drivers/media/rc/ir-imon-decoder.c
index 52ea3b2fda74f67bce8a9bb619fa70bcedf0987f..67c1b0c15aae37f131609f71193e172d682b498b 100644 (file)
--- a/drivers/media/rc/ir-imon-decoder.c
+++ b/drivers/media/rc/ir-imon-decoder.c
@@ -31,9 +31,69 @@ enum imon_state {
        STATE_INACTIVE,
        STATE_BIT_CHK,
        STATE_BIT_START,
-       STATE_FINISHED
+       STATE_FINISHED,
+       STATE_ERROR,
 };
 
+static void ir_imon_decode_scancode(struct rc_dev *dev)
+{
+       struct imon_dec *imon = &dev->raw->imon;
+
+       /* Keyboard/Mouse toggle */
+       if (imon->bits == 0x299115b7)
+               imon->stick_keyboard = !imon->stick_keyboard;
+
+       if ((imon->bits & 0xfc0000ff) == 0x680000b7) {
+               int rel_x, rel_y;
+               u8 buf;
+
+               buf = imon->bits >> 16;
+               rel_x = (buf & 0x08) | (buf & 0x10) >> 2 |
+                       (buf & 0x20) >> 4 | (buf & 0x40) >> 6;
+               if (imon->bits & 0x02000000)
+                       rel_x |= ~0x0f;
+               buf = imon->bits >> 8;
+               rel_y = (buf & 0x08) | (buf & 0x10) >> 2 |
+                       (buf & 0x20) >> 4 | (buf & 0x40) >> 6;
+               if (imon->bits & 0x01000000)
+                       rel_y |= ~0x0f;
+
+               if (rel_x && rel_y && imon->stick_keyboard) {
+                       if (abs(rel_y) > abs(rel_x))
+                               imon->bits = rel_y > 0 ?
+                                       0x289515b7 : /* KEY_DOWN */
+                                       0x2aa515b7;  /* KEY_UP */
+                       else
+                               imon->bits = rel_x > 0 ?
+                                       0x2ba515b7 : /* KEY_RIGHT */
+                                       0x29a515b7;  /* KEY_LEFT */
+               }
+
+               if (!imon->stick_keyboard) {
+                       struct lirc_scancode lsc = {
+                               .scancode = imon->bits,
+                               .rc_proto = RC_PROTO_IMON,
+                       };
+
+                       ir_lirc_scancode_event(dev, &lsc);
+
+                       input_event(imon->idev, EV_MSC, MSC_SCAN, imon->bits);
+
+                       input_report_rel(imon->idev, REL_X, rel_x);
+                       input_report_rel(imon->idev, REL_Y, rel_y);
+
+                       input_report_key(imon->idev, BTN_LEFT,
+                                        (imon->bits & 0x00010000) != 0);
+                       input_report_key(imon->idev, BTN_RIGHT,
+                                        (imon->bits & 0x00040000) != 0);
+                       input_sync(imon->idev);
+                       return;
+               }
+       }
+
+       rc_keydown(dev, RC_PROTO_IMON, imon->bits, 0);
+}
+
 /**
  * ir_imon_decode() - Decode one iMON pulse or space
  * @dev:       the struct rc_dev descriptor of the device
@@ -56,6 +116,22 @@ static int ir_imon_decode(struct rc_dev *dev, struct ir_raw_event ev)
                data->state, data->count, TO_US(ev.duration),
                TO_STR(ev.pulse));
 
+       /*
+        * Since iMON protocol is a series of bits, if at any point
+        * we encounter an error, make sure that any remaining bits
+        * aren't parsed as a scancode made up of less bits.
+        *
+        * Note that if the stick is held, then the remote repeats
+        * the scancode with about 12ms between them. So, make sure
+        * we have at least 10ms of space after an error. That way,
+        * we're at a new scancode.
+        */
+       if (data->state == STATE_ERROR) {
+               if (!ev.pulse && ev.duration > MS_TO_NS(10))
+                       data->state = STATE_INACTIVE;
+               return 0;
+       }
+
        for (;;) {
                if (!geq_margin(ev.duration, IMON_UNIT, IMON_UNIT / 2))
                        return 0;
@@ -95,7 +171,7 @@ static int ir_imon_decode(struct rc_dev *dev, struct ir_raw_event ev)
                case STATE_FINISHED:
                        if (ev.pulse)
                                goto err_out;
-                       rc_keydown(dev, RC_PROTO_IMON, data->bits, 0);
+                       ir_imon_decode_scancode(dev);
                        data->state = STATE_INACTIVE;
                        break;
                }
@@ -107,7 +183,7 @@ err_out:
                data->state, data->count, TO_US(ev.duration),
                TO_STR(ev.pulse));
 
-       data->state = STATE_INACTIVE;
+       data->state = STATE_ERROR;
 
        return -EINVAL;
 }
@@ -165,11 +241,64 @@ static int ir_imon_encode(enum rc_proto protocol, u32 scancode,
        return e - events;
 }
 
+static int ir_imon_register(struct rc_dev *dev)
+{
+       struct input_dev *idev;
+       struct imon_dec *imon = &dev->raw->imon;
+       int ret;
+
+       idev = input_allocate_device();
+       if (!idev)
+               return -ENOMEM;
+
+       snprintf(imon->name, sizeof(imon->name),
+                "iMON PAD Stick (%s)", dev->device_name);
+       idev->name = imon->name;
+       idev->phys = dev->input_phys;
+
+       /* Mouse bits */
+       set_bit(EV_REL, idev->evbit);
+       set_bit(EV_KEY, idev->evbit);
+       set_bit(REL_X, idev->relbit);
+       set_bit(REL_Y, idev->relbit);
+       set_bit(BTN_LEFT, idev->keybit);
+       set_bit(BTN_RIGHT, idev->keybit);
+
+       /* Report scancodes too */
+       set_bit(EV_MSC, idev->evbit);
+       set_bit(MSC_SCAN, idev->mscbit);
+
+       input_set_drvdata(idev, imon);
+
+       ret = input_register_device(idev);
+       if (ret < 0) {
+               input_free_device(idev);
+               return -EIO;
+       }
+
+       imon->idev = idev;
+       imon->stick_keyboard = false;
+
+       return 0;
+}
+
+static int ir_imon_unregister(struct rc_dev *dev)
+{
+       struct imon_dec *imon = &dev->raw->imon;
+
+       input_unregister_device(imon->idev);
+       imon->idev = NULL;
+
+       return 0;
+}
+
 static struct ir_raw_handler imon_handler = {
        .protocols      = RC_PROTO_BIT_IMON,
        .decode         = ir_imon_decode,
        .encode         = ir_imon_encode,
        .carrier        = 38000,
+       .raw_register   = ir_imon_register,
+       .raw_unregister = ir_imon_unregister,
        .min_timeout    = IMON_UNIT * IMON_BITS * 2,
 };
 

diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index 07ba77fe6a3b532a2801dd10e7ec610023768830..bbb9a7eb6b633c962f6144f6bbaf08b9067e8a21 100644 (file)
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -126,6 +126,9 @@ struct ir_raw_event_ctrl {
                int count;
                int last_chk;
                unsigned int bits;
+               bool stick_keyboard;
+               struct input_dev *idev;
+               char name[64];
        } imon;
 };