V4L/DVB: IR: add ir-core to lirc userspace decoder bridge driver

v2: copy of buffer data from userspace done inside this plugin/driver,
keeping the actual drivers minimal, and more flexible in what we can
deliver to them later on (they may be fed from within kernelspace later
on, by an in-kernel IR encoder).

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

6 files changed, 310 insertions, 0 deletions

diff --git a/drivers/media/IR/Kconfig b/drivers/media/IR/Kconfig
index 5d2c37dcf11..40094c007ac 100644
--- a/drivers/media/IR/Kconfig
+++ b/drivers/media/IR/Kconfig
@@ -69,6 +69,16 @@ config IR_SONY_DECODER
            Enable this option if you have an infrared remote control which
            uses the Sony protocol, and you need software decoding support.
 
+config IR_LIRC_CODEC
+        tristate "Enable IR to LIRC bridge"
+        depends on IR_CORE
+        depends on LIRC
+        default y
+
+        ---help---
+           Enable this option to pass raw IR to and from userspace via
+           the LIRC interface.
+
 config IR_IMON
         tristate "SoundGraph iMON Receiver and Display"
         depends on USB_ARCH_HAS_HCD
diff --git a/drivers/media/IR/Makefile b/drivers/media/IR/Makefile
index 3ba00bb8bea..2ae4f3abfdb 100644
--- a/drivers/media/IR/Makefile
+++ b/drivers/media/IR/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_IR_RC5_DECODER) += ir-rc5-decoder.o
 obj-$(CONFIG_IR_RC6_DECODER) += ir-rc6-decoder.o
 obj-$(CONFIG_IR_JVC_DECODER) += ir-jvc-decoder.o
 obj-$(CONFIG_IR_SONY_DECODER) += ir-sony-decoder.o
+obj-$(CONFIG_IR_LIRC_CODEC) += ir-lirc-codec.o
 
 # stand-alone IR receivers/transmitters
 obj-$(CONFIG_IR_IMON) += imon.o
diff --git a/drivers/media/IR/ir-core-priv.h b/drivers/media/IR/ir-core-priv.h
index 0a82b22d382..babd52061bc 100644
--- a/drivers/media/IR/ir-core-priv.h
+++ b/drivers/media/IR/ir-core-priv.h
@@ -73,6 +73,11 @@ struct ir_raw_event_ctrl {
                 bool first;
                 bool toggle;
         } jvc;
+        struct lirc_codec {
+                struct ir_input_dev *ir_dev;
+                struct lirc_driver *drv;
+                int lircdata;
+        } lirc;
 };
 
 /* macros for IR decoders */
@@ -164,4 +169,12 @@ void ir_raw_init(void);
 #define load_sony_decode()      0
 #endif
 
+/* from ir-lirc-codec.c */
+#ifdef CONFIG_IR_LIRC_CODEC_MODULE
+#define load_lirc_codec()       request_module("ir-lirc-codec")
+#else
+#define load_lirc_codec()       0
+#endif
+
+
 #endif /* _IR_RAW_EVENT */
diff --git a/drivers/media/IR/ir-lirc-codec.c b/drivers/media/IR/ir-lirc-codec.c
new file mode 100644
index 00000000000..aff31d1b13d
--- /dev/null
+++ b/drivers/media/IR/ir-lirc-codec.c
@@ -0,0 +1,284 @@
+/* ir-lirc-codec.c - ir-core to classic lirc interface bridge
+ *
+ * Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <media/lirc.h>
+#include <media/ir-core.h>
+#include "ir-core-priv.h"
+#include "lirc_dev.h"
+
+#define LIRCBUF_SIZE 256
+
+/**
+ * ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the
+ *                    lircd userspace daemon for decoding.
+ * @input_dev:  the struct input_dev descriptor of the device
+ * @duration:   the struct ir_raw_event descriptor of the pulse/space
+ *
+ * This function returns -EINVAL if the lirc interfaces aren't wired up.
+ */
+static int ir_lirc_decode(struct input_dev *input_dev, struct ir_raw_event ev)
+{
+        struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+
+        if (!(ir_dev->raw->enabled_protocols & IR_TYPE_LIRC))
+                return 0;
+
+        if (!ir_dev->raw->lirc.drv || !ir_dev->raw->lirc.drv->rbuf)
+                return -EINVAL;
+
+        IR_dprintk(2, "LIRC data transfer started (%uus %s)\n",
+                   TO_US(ev.duration), TO_STR(ev.pulse));
+
+        ir_dev->raw->lirc.lircdata += ev.duration / 1000;
+        if (ev.pulse)
+                ir_dev->raw->lirc.lircdata |= PULSE_BIT;
+
+        lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
+                          (unsigned char *) &ir_dev->raw->lirc.lircdata);
+        wake_up(&ir_dev->raw->lirc.drv->rbuf->wait_poll);
+
+        ir_dev->raw->lirc.lircdata = 0;
+
+        return 0;
+}
+
+static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
+                                   size_t n, loff_t *ppos)
+{
+        struct lirc_codec *lirc;
+        struct ir_input_dev *ir_dev;
+        int *txbuf; /* buffer with values to transmit */
+        int ret = 0, count;
+
+        lirc = lirc_get_pdata(file);
+        if (!lirc)
+                return -EFAULT;
+
+        if (n % sizeof(int))
+                return -EINVAL;
+
+        count = n / sizeof(int);
+        if (count > LIRCBUF_SIZE || count % 2 == 0)
+                return -EINVAL;
+
+        txbuf = kzalloc(sizeof(int) * LIRCBUF_SIZE, GFP_KERNEL);
+        if (!txbuf)
+                return -ENOMEM;
+
+        if (copy_from_user(txbuf, buf, n)) {
+                ret = -EFAULT;
+                goto out;
+        }
+
+        ir_dev = lirc->ir_dev;
+        if (!ir_dev) {
+                ret = -EFAULT;
+                goto out;
+        }
+
+        if (ir_dev->props && ir_dev->props->tx_ir)
+                ret = ir_dev->props->tx_ir(ir_dev->props->priv, txbuf, (u32)n);
+
+out:
+        kfree(txbuf);
+        return ret;
+}
+
+static int ir_lirc_ioctl(struct inode *node, struct file *filep,
+                         unsigned int cmd, unsigned long arg)
+{
+        struct lirc_codec *lirc;
+        struct ir_input_dev *ir_dev;
+        int ret = 0;
+        void *drv_data;
+        unsigned long val;
+
+        lirc = lirc_get_pdata(filep);
+        if (!lirc)
+                return -EFAULT;
+
+        ir_dev = lirc->ir_dev;
+        if (!ir_dev || !ir_dev->props || !ir_dev->props->priv)
+                return -EFAULT;
+
+        drv_data = ir_dev->props->priv;
+
+        switch (cmd) {
+        case LIRC_SET_TRANSMITTER_MASK:
+                ret = get_user(val, (unsigned long *)arg);
+                if (ret)
+                        return ret;
+
+                if (ir_dev->props && 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)
+                        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);
+                break;
+
+        case LIRC_SET_SEND_MODE:
+                ret = get_user(val, (unsigned long *)arg);
+                if (ret)
+                        return ret;
+
+                if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
+                        return -EINVAL;
+                break;
+
+        default:
+                return lirc_dev_fop_ioctl(node, filep, cmd, arg);
+        }
+
+        return ret;
+}
+
+static int ir_lirc_open(void *data)
+{
+        return 0;
+}
+
+static void ir_lirc_close(void *data)
+{
+        return;
+}
+
+static struct file_operations lirc_fops = {
+        .owner          = THIS_MODULE,
+        .write          = ir_lirc_transmit_ir,
+        .ioctl          = ir_lirc_ioctl,
+        .read           = lirc_dev_fop_read,
+        .poll           = lirc_dev_fop_poll,
+        .open           = lirc_dev_fop_open,
+        .release        = lirc_dev_fop_close,
+};
+
+static int ir_lirc_register(struct input_dev *input_dev)
+{
+        struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+        struct lirc_driver *drv;
+        struct lirc_buffer *rbuf;
+        int rc = -ENOMEM;
+        unsigned long features;
+
+        drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
+        if (!drv)
+                return rc;
+
+        rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
+        if (!drv)
+                goto rbuf_alloc_failed;
+
+        rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
+        if (rc)
+                goto rbuf_init_failed;
+
+        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;
+        }
+
+        snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
+                 ir_dev->driver_name);
+        drv->minor = -1;
+        drv->features = features;
+        drv->data = &ir_dev->raw->lirc;
+        drv->rbuf = rbuf;
+        drv->set_use_inc = &ir_lirc_open;
+        drv->set_use_dec = &ir_lirc_close;
+        drv->code_length = sizeof(struct ir_raw_event) * 8;
+        drv->fops = &lirc_fops;
+        drv->dev = &ir_dev->dev;
+        drv->owner = THIS_MODULE;
+
+        drv->minor = lirc_register_driver(drv);
+        if (drv->minor < 0) {
+                rc = -ENODEV;
+                goto lirc_register_failed;
+        }
+
+        ir_dev->raw->lirc.drv = drv;
+        ir_dev->raw->lirc.ir_dev = ir_dev;
+        ir_dev->raw->lirc.lircdata = PULSE_MASK;
+
+        return 0;
+
+lirc_register_failed:
+rbuf_init_failed:
+        kfree(rbuf);
+rbuf_alloc_failed:
+        kfree(drv);
+
+        return rc;
+}
+
+static int ir_lirc_unregister(struct input_dev *input_dev)
+{
+        struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+        struct lirc_codec *lirc = &ir_dev->raw->lirc;
+
+        lirc_unregister_driver(lirc->drv->minor);
+        lirc_buffer_free(lirc->drv->rbuf);
+        kfree(lirc->drv);
+
+        return 0;
+}
+
+static struct ir_raw_handler lirc_handler = {
+        .protocols      = IR_TYPE_LIRC,
+        .decode         = ir_lirc_decode,
+        .raw_register   = ir_lirc_register,
+        .raw_unregister = ir_lirc_unregister,
+};
+
+static int __init ir_lirc_codec_init(void)
+{
+        ir_raw_handler_register(&lirc_handler);
+
+        printk(KERN_INFO "IR LIRC bridge handler initialized\n");
+        return 0;
+}
+
+static void __exit ir_lirc_codec_exit(void)
+{
+        ir_raw_handler_unregister(&lirc_handler);
+}
+
+module_init(ir_lirc_codec_init);
+module_exit(ir_lirc_codec_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
+MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
+MODULE_DESCRIPTION("LIRC IR handler bridge");
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
index 5f98ab82305..6f192ef31db 100644
--- a/drivers/media/IR/ir-raw-event.c
+++ b/drivers/media/IR/ir-raw-event.c
@@ -253,6 +253,7 @@ static void init_decoders(struct work_struct *work)
         load_rc6_decode();
         load_jvc_decode();
         load_sony_decode();
+        load_lirc_codec();
 
         /* If needed, we may later add some init code. In this case,
            it is needed to change the CONFIG_MODULE test at ir-core.h
diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
index f176fbff948..6273047e915 100644
--- a/drivers/media/IR/ir-sysfs.c
+++ b/drivers/media/IR/ir-sysfs.c
@@ -43,6 +43,7 @@ static struct {
         { IR_TYPE_RC6,          "rc-6"          },
         { IR_TYPE_JVC,          "jvc"           },
         { IR_TYPE_SONY,         "sony"          },
+        { IR_TYPE_LIRC,         "lirc"          },
 };
 
 #define PROTO_NONE      "none"