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Subject: [media] redrat3: hardware-specific parameters
Author:  Sean Young <s...@mess.org>
Date:    Wed Jul 20 14:03:50 2016 -0300

Add these options as module parameters for now; should other drivers
need similar options we could add it to the LIRC api.

Signed-off-by: Sean Young <s...@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/rc/redrat3.c | 50 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

---

diff --git a/drivers/media/rc/redrat3.c b/drivers/media/rc/redrat3.c
index f4fae0934eca..05ba47bc0b61 100644
--- a/drivers/media/rc/redrat3.c
+++ b/drivers/media/rc/redrat3.c
@@ -124,6 +124,41 @@
 #define USB_RR3USB_PRODUCT_ID  0x0001
 #define USB_RR3IIUSB_PRODUCT_ID        0x0005
 
+
+/*
+ * The redrat3 encodes an IR signal as set of different lengths and a set
+ * of indices into those lengths. This sets how much two lengths must
+ * differ before they are considered distinct, the value is specified
+ * in microseconds.
+ * Default 5, value 0 to 127.
+ */
+static int length_fuzz = 5;
+module_param(length_fuzz, uint, 0644);
+MODULE_PARM_DESC(length_fuzz, "Length Fuzz (0-127)");
+
+/*
+ * When receiving a continuous ir stream (for example when a user is
+ * holding a button down on a remote), this specifies the minimum size
+ * of a space when the redrat3 sends a irdata packet to the host. Specified
+ * in miliseconds. Default value 18ms.
+ * The value can be between 2 and 30 inclusive.
+ */
+static int minimum_pause = 18;
+module_param(minimum_pause, uint, 0644);
+MODULE_PARM_DESC(minimum_pause, "Minimum Pause in ms (2-30)");
+
+/*
+ * The carrier frequency is measured during the first pulse of the IR
+ * signal. The larger the number of periods used To measure, the more
+ * accurate the result is likely to be, however some signals have short
+ * initial pulses, so in some case it may be necessary to reduce this value.
+ * Default 8, value 1 to 255.
+ */
+static int periods_measure_carrier = 8;
+module_param(periods_measure_carrier, uint, 0644);
+MODULE_PARM_DESC(periods_measure_carrier, "Number of Periods to Measure 
Carrier (1-255)");
+
+
 struct redrat3_header {
        __be16 length;
        __be16 transfer_type;
@@ -525,12 +560,25 @@ static void redrat3_reset(struct redrat3_dev *rr3)
                             RR3_CPUCS_REG_ADDR, 0, val, len, HZ * 25);
        dev_dbg(dev, "reset returned 0x%02x\n", rc);
 
-       *val = 5;
+       *val = length_fuzz;
        rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
                             USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
                             RR3_IR_IO_LENGTH_FUZZ, 0, val, len, HZ * 25);
        dev_dbg(dev, "set ir parm len fuzz %d rc 0x%02x\n", *val, rc);
 
+       *val = (65536 - (minimum_pause * 2000)) / 256;
+       rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
+                            USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
+                            RR3_IR_IO_MIN_PAUSE, 0, val, len, HZ * 25);
+       dev_dbg(dev, "set ir parm min pause %d rc 0x%02x\n", *val, rc);
+
+       *val = periods_measure_carrier;
+       rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
+                            USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
+                            RR3_IR_IO_PERIODS_MF, 0, val, len, HZ * 25);
+       dev_dbg(dev, "set ir parm periods measure carrier %d rc 0x%02x", *val,
+                                                                       rc);
+
        *val = RR3_DRIVER_MAXLENS;
        rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
                             USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,

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