1 files changed, 410 insertions, 0 deletions

diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c
new file mode 100644
index 00000000000..9fc0db9d344
--- /dev/null
+++ b/drivers/media/rc/ir-lirc-codec.c
@@ -0,0 +1,410 @@
+/* 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/lirc_dev.h>
+#include <media/ir-core.h>
+#include "ir-core-priv.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);
+        struct lirc_codec *lirc = &ir_dev->raw->lirc;
+        int sample;
+
+        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;
+
+        /* Packet start */
+        if (ev.reset)
+                return 0;
+
+        /* Carrier reports */
+        if (ev.carrier_report) {
+                sample = LIRC_FREQUENCY(ev.carrier);
+
+        /* Packet end */
+        } else if (ev.timeout) {
+
+                if (lirc->gap)
+                        return 0;
+
+                lirc->gap_start = ktime_get();
+                lirc->gap = true;
+                lirc->gap_duration = ev.duration;
+
+                if (!lirc->send_timeout_reports)
+                        return 0;
+
+                sample = LIRC_TIMEOUT(ev.duration / 1000);
+
+        /* Normal sample */
+        } else {
+
+                if (lirc->gap) {
+                        int gap_sample;
+
+                        lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
+                                lirc->gap_start));
+
+                        /* Convert to ms and cap by LIRC_VALUE_MASK */
+                        do_div(lirc->gap_duration, 1000);
+                        lirc->gap_duration = min(lirc->gap_duration,
+                                                        (u64)LIRC_VALUE_MASK);
+
+                        gap_sample = LIRC_SPACE(lirc->gap_duration);
+                        lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
+                                                (unsigned char *) &gap_sample);
+                        lirc->gap = false;
+                }
+
+                sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
+                                        LIRC_SPACE(ev.duration / 1000);
+        }
+
+        lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
+                          (unsigned char *) &sample);
+        wake_up(&ir_dev->raw->lirc.drv->rbuf->wait_poll);
+
+        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 = memdup_user(buf, n);
+        if (IS_ERR(txbuf))
+                return PTR_ERR(txbuf);
+
+        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 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;
+        __u32 val = 0, tmp;
+
+        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;
+
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                ret = get_user(val, (__u32 *)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;
+                return 0;
+
+        /* TX settings */
+        case LIRC_SET_TRANSMITTER_MASK:
+                if (!ir_dev->props->s_tx_mask)
+                        return -EINVAL;
+
+                return ir_dev->props->s_tx_mask(drv_data, val);
+
+        case LIRC_SET_SEND_CARRIER:
+                if (!ir_dev->props->s_tx_carrier)
+                        return -EINVAL;
+
+                return ir_dev->props->s_tx_carrier(drv_data, val);
+
+        case LIRC_SET_SEND_DUTY_CYCLE:
+                if (!ir_dev->props->s_tx_duty_cycle)
+                        return -ENOSYS;
+
+                if (val <= 0 || val >= 100)
+                        return -EINVAL;
+
+                return ir_dev->props->s_tx_duty_cycle(drv_data, val);
+
+        /* RX settings */
+        case LIRC_SET_REC_CARRIER:
+                if (!ir_dev->props->s_rx_carrier_range)
+                        return -ENOSYS;
+
+                if (val <= 0)
+                        return -EINVAL;
+
+                return ir_dev->props->s_rx_carrier_range(drv_data,
+                        ir_dev->raw->lirc.carrier_low, val);
+
+        case LIRC_SET_REC_CARRIER_RANGE:
+                if (val <= 0)
+                        return -EINVAL;
+
+                ir_dev->raw->lirc.carrier_low = val;
+                return 0;
+
+        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 -ENOSYS;
+
+                return ir_dev->props->s_learning_mode(drv_data, !!val);
+
+        case LIRC_SET_MEASURE_CARRIER_MODE:
+                if (!ir_dev->props->s_carrier_report)
+                        return -ENOSYS;
+
+                return ir_dev->props->s_carrier_report(drv_data, !!val);
+
+        /* 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 (!ir_dev->props->max_timeout)
+                        return -ENOSYS;
+
+                tmp = val * 1000;
+
+                if (tmp < ir_dev->props->min_timeout ||
+                        tmp > ir_dev->props->max_timeout)
+                                return -EINVAL;
+
+                ir_dev->props->timeout = tmp;
+                break;
+
+        case LIRC_SET_REC_TIMEOUT_REPORTS:
+                lirc->send_timeout_reports = !!val;
+                break;
+
+        default:
+                return lirc_dev_fop_ioctl(filep, cmd, arg);
+        }
+
+        if (_IOC_DIR(cmd) & _IOC_READ)
+                ret = put_user(val, (__u32 *)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,
+        .unlocked_ioctl = ir_lirc_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ir_lirc_ioctl,
+#endif
+        .read           = lirc_dev_fop_read,
+        .poll           = lirc_dev_fop_poll,
+        .open           = lirc_dev_fop_open,
+        .release        = lirc_dev_fop_close,
+        .llseek         = no_llseek,
+};
+
+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 (!rbuf)
+                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;
+
+                if (ir_dev->props->s_tx_duty_cycle)
+                        features |= LIRC_CAN_SET_SEND_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->s_carrier_report)
+                features |= LIRC_CAN_MEASURE_CARRIER;
+
+
+        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;
+        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;
+        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");