diff options
Diffstat (limited to 'drivers/media/rc/ir-lirc-codec.c')
| -rw-r--r-- | drivers/media/rc/ir-lirc-codec.c | 448 |
1 files changed, 0 insertions, 448 deletions
diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c deleted file mode 100644 index 4fd4521693d9..000000000000 --- a/drivers/media/rc/ir-lirc-codec.c +++ /dev/null @@ -1,448 +0,0 @@ -/* ir-lirc-codec.c - rc-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 <linux/module.h> -#include <media/lirc.h> -#include <media/lirc_dev.h> -#include <media/rc-core.h> -#include "rc-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. - * @dev: the struct rc_dev descriptor of the device - * @ev: 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 rc_dev *dev, struct ir_raw_event ev) -{ - struct lirc_codec *lirc = &dev->raw->lirc; - int sample; - - if (!dev->raw->lirc.ldev || !dev->raw->lirc.ldev->buf) - return -EINVAL; - - /* Packet start */ - if (ev.reset) { - /* Userspace expects a long space event before the start of - * the signal to use as a sync. This may be done with repeat - * packets and normal samples. But if a reset has been sent - * then we assume that a long time has passed, so we send a - * space with the maximum time value. */ - sample = LIRC_SPACE(LIRC_VALUE_MASK); - IR_dprintk(2, "delivering reset sync space to lirc_dev\n"); - - /* Carrier reports */ - } else if (ev.carrier_report) { - sample = LIRC_FREQUENCY(ev.carrier); - IR_dprintk(2, "carrier report (freq: %d)\n", sample); - - /* 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); - IR_dprintk(2, "timeout report (duration: %d)\n", sample); - - /* 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(dev->raw->lirc.ldev->buf, - (unsigned char *)&gap_sample); - lirc->gap = false; - } - - sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) : - LIRC_SPACE(ev.duration / 1000); - IR_dprintk(2, "delivering %uus %s to lirc_dev\n", - TO_US(ev.duration), TO_STR(ev.pulse)); - } - - lirc_buffer_write(dev->raw->lirc.ldev->buf, - (unsigned char *) &sample); - wake_up(&dev->raw->lirc.ldev->buf->wait_poll); - - return 0; -} - -static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf, - size_t n, loff_t *ppos) -{ - struct lirc_codec *lirc; - struct rc_dev *dev; - unsigned int *txbuf; /* buffer with values to transmit */ - ssize_t ret = -EINVAL; - size_t count; - ktime_t start; - s64 towait; - unsigned int duration = 0; /* signal duration in us */ - int i; - - start = ktime_get(); - - lirc = lirc_get_pdata(file); - if (!lirc) - return -EFAULT; - - if (n < sizeof(unsigned) || n % sizeof(unsigned)) - return -EINVAL; - - count = n / sizeof(unsigned); - if (count > LIRCBUF_SIZE || count % 2 == 0) - return -EINVAL; - - txbuf = memdup_user(buf, n); - if (IS_ERR(txbuf)) - return PTR_ERR(txbuf); - - dev = lirc->dev; - if (!dev) { - ret = -EFAULT; - goto out; - } - - if (!dev->tx_ir) { - ret = -EINVAL; - goto out; - } - - for (i = 0; i < count; i++) { - if (txbuf[i] > IR_MAX_DURATION / 1000 - duration || !txbuf[i]) { - ret = -EINVAL; - goto out; - } - - duration += txbuf[i]; - } - - ret = dev->tx_ir(dev, txbuf, count); - if (ret < 0) - goto out; - - for (duration = i = 0; i < ret; i++) - duration += txbuf[i]; - - ret *= sizeof(unsigned int); - - /* - * The lircd gap calculation expects the write function to - * wait for the actual IR signal to be transmitted before - * returning. - */ - towait = ktime_us_delta(ktime_add_us(start, duration), ktime_get()); - if (towait > 0) { - set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(usecs_to_jiffies(towait)); - } - -out: - kfree(txbuf); - return ret; -} - -static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, - unsigned long arg) -{ - struct lirc_codec *lirc; - struct rc_dev *dev; - u32 __user *argp = (u32 __user *)(arg); - int ret = 0; - __u32 val = 0, tmp; - - lirc = lirc_get_pdata(filep); - if (!lirc) - return -EFAULT; - - dev = lirc->dev; - if (!dev) - return -EFAULT; - - if (_IOC_DIR(cmd) & _IOC_WRITE) { - ret = get_user(val, argp); - if (ret) - return ret; - } - - switch (cmd) { - - /* legacy support */ - case LIRC_GET_SEND_MODE: - if (!dev->tx_ir) - return -ENOTTY; - - val = LIRC_MODE_PULSE; - break; - - case LIRC_SET_SEND_MODE: - if (!dev->tx_ir) - return -ENOTTY; - - if (val != LIRC_MODE_PULSE) - return -EINVAL; - return 0; - - /* TX settings */ - case LIRC_SET_TRANSMITTER_MASK: - if (!dev->s_tx_mask) - return -ENOTTY; - - return dev->s_tx_mask(dev, val); - - case LIRC_SET_SEND_CARRIER: - if (!dev->s_tx_carrier) - return -ENOTTY; - - return dev->s_tx_carrier(dev, val); - - case LIRC_SET_SEND_DUTY_CYCLE: - if (!dev->s_tx_duty_cycle) - return -ENOTTY; - - if (val <= 0 || val >= 100) - return -EINVAL; - - return dev->s_tx_duty_cycle(dev, val); - - /* RX settings */ - case LIRC_SET_REC_CARRIER: - if (!dev->s_rx_carrier_range) - return -ENOTTY; - - if (val <= 0) - return -EINVAL; - - return dev->s_rx_carrier_range(dev, - dev->raw->lirc.carrier_low, - val); - - case LIRC_SET_REC_CARRIER_RANGE: - if (!dev->s_rx_carrier_range) - return -ENOTTY; - - if (val <= 0) - return -EINVAL; - - dev->raw->lirc.carrier_low = val; - return 0; - - case LIRC_GET_REC_RESOLUTION: - if (!dev->rx_resolution) - return -ENOTTY; - - val = dev->rx_resolution / 1000; - break; - - case LIRC_SET_WIDEBAND_RECEIVER: - if (!dev->s_learning_mode) - return -ENOTTY; - - return dev->s_learning_mode(dev, !!val); - - case LIRC_SET_MEASURE_CARRIER_MODE: - if (!dev->s_carrier_report) - return -ENOTTY; - - return dev->s_carrier_report(dev, !!val); - - /* Generic timeout support */ - case LIRC_GET_MIN_TIMEOUT: - if (!dev->max_timeout) - return -ENOTTY; - val = DIV_ROUND_UP(dev->min_timeout, 1000); - break; - - case LIRC_GET_MAX_TIMEOUT: - if (!dev->max_timeout) - return -ENOTTY; - val = dev->max_timeout / 1000; - break; - - case LIRC_SET_REC_TIMEOUT: - if (!dev->max_timeout) - return -ENOTTY; - - /* Check for multiply overflow */ - if (val > U32_MAX / 1000) - return -EINVAL; - - tmp = val * 1000; - - if (tmp < dev->min_timeout || tmp > dev->max_timeout) - return -EINVAL; - - if (dev->s_timeout) - ret = dev->s_timeout(dev, tmp); - if (!ret) - dev->timeout = tmp; - break; - - case LIRC_SET_REC_TIMEOUT_REPORTS: - if (!dev->timeout) - return -ENOTTY; - - 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, argp); - - return ret; -} - -static const 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 rc_dev *dev) -{ - struct lirc_dev *ldev; - int rc = -ENOMEM; - unsigned long features = 0; - - ldev = lirc_allocate_device(); - if (!ldev) - return rc; - - if (dev->driver_type != RC_DRIVER_IR_RAW_TX) { - features |= LIRC_CAN_REC_MODE2; - if (dev->rx_resolution) - features |= LIRC_CAN_GET_REC_RESOLUTION; - } - - if (dev->tx_ir) { - features |= LIRC_CAN_SEND_PULSE; - if (dev->s_tx_mask) - features |= LIRC_CAN_SET_TRANSMITTER_MASK; - if (dev->s_tx_carrier) - features |= LIRC_CAN_SET_SEND_CARRIER; - if (dev->s_tx_duty_cycle) - features |= LIRC_CAN_SET_SEND_DUTY_CYCLE; - } - - if (dev->s_rx_carrier_range) - features |= LIRC_CAN_SET_REC_CARRIER | - LIRC_CAN_SET_REC_CARRIER_RANGE; - - if (dev->s_learning_mode) - features |= LIRC_CAN_USE_WIDEBAND_RECEIVER; - - if (dev->s_carrier_report) - features |= LIRC_CAN_MEASURE_CARRIER; - - if (dev->max_timeout) - features |= LIRC_CAN_SET_REC_TIMEOUT; - - snprintf(ldev->name, sizeof(ldev->name), "ir-lirc-codec (%s)", - dev->driver_name); - ldev->features = features; - ldev->data = &dev->raw->lirc; - ldev->buf = NULL; - ldev->code_length = sizeof(struct ir_raw_event) * 8; - ldev->chunk_size = sizeof(int); - ldev->buffer_size = LIRCBUF_SIZE; - ldev->fops = &lirc_fops; - ldev->dev.parent = &dev->dev; - ldev->rdev = dev; - ldev->owner = THIS_MODULE; - - rc = lirc_register_device(ldev); - if (rc < 0) - goto out; - - dev->raw->lirc.ldev = ldev; - dev->raw->lirc.dev = dev; - return 0; - -out: - lirc_free_device(ldev); - return rc; -} - -static int ir_lirc_unregister(struct rc_dev *dev) -{ - struct lirc_codec *lirc = &dev->raw->lirc; - - lirc_unregister_device(lirc->ldev); - lirc->ldev = NULL; - - return 0; -} - -static struct ir_raw_handler lirc_handler = { - .protocols = 0, - .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"); |