V4L/DVB: IR: extend interfaces to support more device settings

LIRC: add new IOCTL that enables learning mode (wide band receiver)
Still missing features: carrier report & timeout reports.
Will need to pack these into ir_raw_event

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

5 files changed, 125 insertions, 21 deletions

diff --git a/Documentation/DocBook/v4l/lirc_device_interface.xml b/Documentation/DocBook/v4l/lirc_device_interface.xml
index 0413234023d4..68134c0ab4d1 100644
--- a/Documentation/DocBook/v4l/lirc_device_interface.xml
+++ b/Documentation/DocBook/v4l/lirc_device_interface.xml
@@ -229,6 +229,22 @@ on working with the default settings initially.</para>
       and LIRC_SETUP_END. Drivers can also choose to ignore these ioctls.</para>
     </listitem>
   </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_WIDEBAND_RECEIVER</term>
+    <listitem>
+      <para>Some receivers are equipped with special wide band receiver which is intended
+      to be used to learn output of existing remote.
+      Calling that ioctl with (1) will enable it, and with (0) disable it.
+      This might be useful of receivers that have otherwise narrow band receiver
+      that prevents them to be used with some remotes.
+      Wide band receiver might also be more precise
+      On the other hand its disadvantage it usually reduced range of reception.
+      Note: wide band receiver might be implictly enabled if you enable
+      carrier reports. In that case it will be disabled as soon as you disable
+      carrier reports. Trying to disable wide band receiver while carrier
+      reports are active will do nothing.</para>
+    </listitem>
+  </varlistentry>
 </variablelist>
 
 </section>
diff --git a/drivers/media/IR/ir-core-priv.h b/drivers/media/IR/ir-core-priv.h
index 8053e3b84272..a85a8c7c905a 100644
--- a/drivers/media/IR/ir-core-priv.h
+++ b/drivers/media/IR/ir-core-priv.h
@@ -79,6 +79,7 @@ struct ir_raw_event_ctrl {
         struct lirc_codec {
                 struct ir_input_dev *ir_dev;
                 struct lirc_driver *drv;
+                int carrier_low;
         } lirc;
 };
 
diff --git a/drivers/media/IR/ir-lirc-codec.c b/drivers/media/IR/ir-lirc-codec.c
index 8ca01fd67139..77b5946413c0 100644
--- a/drivers/media/IR/ir-lirc-codec.c
+++ b/drivers/media/IR/ir-lirc-codec.c
@@ -46,7 +46,6 @@ static int ir_lirc_decode(struct input_dev *input_dev, struct ir_raw_event ev)
         IR_dprintk(2, "LIRC data transfer started (%uus %s)\n",
                    TO_US(ev.duration), TO_STR(ev.pulse));
 
-
         sample = ev.duration / 1000;
         if (ev.pulse)
                 sample |= PULSE_BIT;
@@ -96,13 +95,14 @@ out:
         return ret;
 }
 
-static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
+                        unsigned long __user arg)
 {
         struct lirc_codec *lirc;
         struct ir_input_dev *ir_dev;
         int ret = 0;
         void *drv_data;
-        unsigned long val;
+        unsigned long val = 0;
 
         lirc = lirc_get_pdata(filep);
         if (!lirc)
@@ -114,47 +114,106 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long ar
 
         drv_data = ir_dev->props->priv;
 
-        switch (cmd) {
-        case LIRC_SET_TRANSMITTER_MASK:
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
                 ret = get_user(val, (unsigned long *)arg);
                 if (ret)
                         return ret;
+        }
+
+        switch (cmd) {
+
+        /* legacy support */
+        case LIRC_GET_SEND_MODE:
+                val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
+                break;
+
+        case LIRC_SET_SEND_MODE:
+                if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
+                        return -EINVAL;
+                break;
 
-                if (ir_dev->props && ir_dev->props->s_tx_mask)
+        /* TX settings */
+        case LIRC_SET_TRANSMITTER_MASK:
+                if (ir_dev->props->s_tx_mask)
                         ret = ir_dev->props->s_tx_mask(drv_data, (u32)val);
                 else
                         return -EINVAL;
                 break;
 
         case LIRC_SET_SEND_CARRIER:
-                ret = get_user(val, (unsigned long *)arg);
-                if (ret)
-                        return ret;
-
-                if (ir_dev->props && ir_dev->props->s_tx_carrier)
+                if (ir_dev->props->s_tx_carrier)
                         ir_dev->props->s_tx_carrier(drv_data, (u32)val);
                 else
                         return -EINVAL;
                 break;
 
-        case LIRC_GET_SEND_MODE:
-                val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
-                ret = put_user(val, (unsigned long *)arg);
+        case LIRC_SET_SEND_DUTY_CYCLE:
+                if (!ir_dev->props->s_tx_duty_cycle)
+                        return -ENOSYS;
+
+                if (val <= 0 || val >= 100)
+                        return -EINVAL;
+
+                ir_dev->props->s_tx_duty_cycle(ir_dev->props->priv, val);
                 break;
 
-        case LIRC_SET_SEND_MODE:
-                ret = get_user(val, (unsigned long *)arg);
-                if (ret)
-                        return ret;
+        /* RX settings */
+        case LIRC_SET_REC_CARRIER:
+                if (ir_dev->props->s_rx_carrier_range)
+                        ret = ir_dev->props->s_rx_carrier_range(
+                                ir_dev->props->priv,
+                                ir_dev->raw->lirc.carrier_low, val);
+                else
+                        return -ENOSYS;
 
-                if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
+                if (!ret)
+                        ir_dev->raw->lirc.carrier_low = 0;
+                break;
+
+        case LIRC_SET_REC_CARRIER_RANGE:
+                if (val >= 0)
+                        ir_dev->raw->lirc.carrier_low = val;
+                break;
+
+
+        case LIRC_GET_REC_RESOLUTION:
+                val = ir_dev->props->rx_resolution;
+                break;
+
+        case LIRC_SET_WIDEBAND_RECEIVER:
+                if (ir_dev->props->s_learning_mode)
+                        return ir_dev->props->s_learning_mode(
+                                ir_dev->props->priv, !!val);
+                else
+                        return -ENOSYS;
+
+        /* Generic timeout support */
+        case LIRC_GET_MIN_TIMEOUT:
+                if (!ir_dev->props->max_timeout)
+                        return -ENOSYS;
+                val = ir_dev->props->min_timeout / 1000;
+                break;
+
+        case LIRC_GET_MAX_TIMEOUT:
+                if (!ir_dev->props->max_timeout)
+                        return -ENOSYS;
+                val = ir_dev->props->max_timeout / 1000;
+                break;
+
+        case LIRC_SET_REC_TIMEOUT:
+                if (val < ir_dev->props->min_timeout ||
+                    val > ir_dev->props->max_timeout)
                         return -EINVAL;
+                ir_dev->props->timeout = val * 1000;
                 break;
 
         default:
                 return lirc_dev_fop_ioctl(filep, cmd, arg);
         }
 
+        if (_IOC_DIR(cmd) & _IOC_READ)
+                ret = put_user(val, (unsigned long *)arg);
+
         return ret;
 }
 
@@ -200,13 +259,28 @@ static int ir_lirc_register(struct input_dev *input_dev)
 
         features = LIRC_CAN_REC_MODE2;
         if (ir_dev->props->tx_ir) {
+
                 features |= LIRC_CAN_SEND_PULSE;
                 if (ir_dev->props->s_tx_mask)
                         features |= LIRC_CAN_SET_TRANSMITTER_MASK;
                 if (ir_dev->props->s_tx_carrier)
                         features |= LIRC_CAN_SET_SEND_CARRIER;
+
+                if (ir_dev->props->s_tx_duty_cycle)
+                        features |= LIRC_CAN_SET_REC_DUTY_CYCLE;
         }
 
+        if (ir_dev->props->s_rx_carrier_range)
+                features |= LIRC_CAN_SET_REC_CARRIER |
+                        LIRC_CAN_SET_REC_CARRIER_RANGE;
+
+        if (ir_dev->props->s_learning_mode)
+                features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
+
+        if (ir_dev->props->max_timeout)
+                features |= LIRC_CAN_SET_REC_TIMEOUT;
+
+
         snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
                  ir_dev->driver_name);
         drv->minor = -1;
diff --git a/include/media/ir-core.h b/include/media/ir-core.h
index a781045aeed5..eb7fddf8f607 100644
--- a/include/media/ir-core.h
+++ b/include/media/ir-core.h
@@ -44,6 +44,8 @@ enum rc_driver_type {
  * @timeout: optional time after which device stops sending data
  * @min_timeout: minimum timeout supported by device
  * @max_timeout: maximum timeout supported by device
+ * @rx_resolution : resolution (in ns) of input sampler
+ * @tx_resolution: resolution (in ns) of output sampler
  * @priv: driver-specific data, to be used on the callbacks
  * @change_protocol: allow changing the protocol used on hardware decoders
  * @open: callback to allow drivers to enable polling/irq when IR input device
@@ -52,9 +54,12 @@ enum rc_driver_type {
  *      is opened.
  * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
  * @s_tx_carrier: set transmit carrier frequency
+ * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
+ * @s_rx_carrier: inform driver about carrier it is expected to handle
  * @tx_ir: transmit IR
  * @s_idle: optional: enable/disable hardware idle mode, upon which,
- *      device doesn't interrupt host untill it sees IR data
+        device doesn't interrupt host until it sees IR pulses
+ * @s_learning_mode: enable wide band receiver used for learning
  */
 struct ir_dev_props {
         enum rc_driver_type     driver_type;
@@ -65,6 +70,8 @@ struct ir_dev_props {
         u32                     min_timeout;
         u32                     max_timeout;
 
+        u32                     rx_resolution;
+        u32                     tx_resolution;
 
         void                    *priv;
         int                     (*change_protocol)(void *priv, u64 ir_type);
@@ -72,8 +79,11 @@ struct ir_dev_props {
         void                    (*close)(void *priv);
         int                     (*s_tx_mask)(void *priv, u32 mask);
         int                     (*s_tx_carrier)(void *priv, u32 carrier);
+        int                     (*s_tx_duty_cycle)(void *priv, u32 duty_cycle);
+        int                     (*s_rx_carrier_range)(void *priv, u32 min, u32 max);
         int                     (*tx_ir)(void *priv, int *txbuf, u32 n);
         void                    (*s_idle)(void *priv, int enable);
+        int                     (*s_learning_mode)(void *priv, int enable);
 };
 
 struct ir_input_dev {
diff --git a/include/media/lirc.h b/include/media/lirc.h
index 42c467c50519..6678a169fd9e 100644
--- a/include/media/lirc.h
+++ b/include/media/lirc.h
@@ -77,6 +77,7 @@
 #define LIRC_CAN_SET_REC_FILTER           0x08000000
 
 #define LIRC_CAN_MEASURE_CARRIER          0x02000000
+#define LIRC_CAN_USE_WIDEBAND_RECEIVER    0x04000000
 
 #define LIRC_CAN_SEND(x) ((x)&LIRC_CAN_SEND_MASK)
 #define LIRC_CAN_REC(x) ((x)&LIRC_CAN_REC_MASK)
@@ -145,7 +146,7 @@
  * if enabled from the next key press on the driver will send
  * LIRC_MODE2_FREQUENCY packets
  */
-#define LIRC_SET_MEASURE_CARRIER_MODE  _IOW('i', 0x0000001d, __u32)
+#define LIRC_SET_MEASURE_CARRIER_MODE   _IOW('i', 0x0000001d, __u32)
 
 /*
  * to set a range use
@@ -162,4 +163,6 @@
 #define LIRC_SETUP_START               _IO('i', 0x00000021)
 #define LIRC_SETUP_END                 _IO('i', 0x00000022)
 
+#define LIRC_SET_WIDEBAND_RECEIVER     _IOW('i', 0x00000023, __u32)
+
 #endif