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>
diff --git a/drivers/media/IR/ir-lirc-codec.c b/drivers/media/IR/ir-lirc-codec.c
new file mode 100644
index 0000000..aff31d1
--- /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");