| /* 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. |
| * @input_dev: the struct rc_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 rc_dev *dev, struct ir_raw_event ev) |
| { |
| struct lirc_codec *lirc = &dev->raw->lirc; |
| int sample; |
| |
| if (!(dev->enabled_protocols & RC_BIT_LIRC)) |
| return 0; |
| |
| if (!dev->raw->lirc.drv || !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); |
| 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.drv->rbuf, |
| (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.drv->rbuf, |
| (unsigned char *) &sample); |
| wake_up(&dev->raw->lirc.drv->rbuf->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 = -ENOSYS; |
| 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: |
| 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 (!dev->s_tx_mask) |
| return -ENOSYS; |
| |
| return dev->s_tx_mask(dev, val); |
| |
| case LIRC_SET_SEND_CARRIER: |
| if (!dev->s_tx_carrier) |
| return -ENOSYS; |
| |
| return dev->s_tx_carrier(dev, val); |
| |
| case LIRC_SET_SEND_DUTY_CYCLE: |
| if (!dev->s_tx_duty_cycle) |
| return -ENOSYS; |
| |
| 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 -ENOSYS; |
| |
| 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 (val <= 0) |
| return -EINVAL; |
| |
| dev->raw->lirc.carrier_low = val; |
| return 0; |
| |
| case LIRC_GET_REC_RESOLUTION: |
| val = dev->rx_resolution; |
| break; |
| |
| case LIRC_SET_WIDEBAND_RECEIVER: |
| if (!dev->s_learning_mode) |
| return -ENOSYS; |
| |
| return dev->s_learning_mode(dev, !!val); |
| |
| case LIRC_SET_MEASURE_CARRIER_MODE: |
| if (!dev->s_carrier_report) |
| return -ENOSYS; |
| |
| return dev->s_carrier_report(dev, !!val); |
| |
| /* Generic timeout support */ |
| case LIRC_GET_MIN_TIMEOUT: |
| if (!dev->max_timeout) |
| return -ENOSYS; |
| val = dev->min_timeout / 1000; |
| break; |
| |
| case LIRC_GET_MAX_TIMEOUT: |
| if (!dev->max_timeout) |
| return -ENOSYS; |
| val = dev->max_timeout / 1000; |
| break; |
| |
| case LIRC_SET_REC_TIMEOUT: |
| if (!dev->max_timeout) |
| return -ENOSYS; |
| |
| tmp = val * 1000; |
| |
| if (tmp < dev->min_timeout || |
| tmp > dev->max_timeout) |
| return -EINVAL; |
| |
| dev->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, argp); |
| |
| return ret; |
| } |
| |
| static int ir_lirc_open(void *data) |
| { |
| return 0; |
| } |
| |
| static void ir_lirc_close(void *data) |
| { |
| return; |
| } |
| |
| 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_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 (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(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)", |
| dev->driver_name); |
| drv->minor = -1; |
| drv->features = features; |
| drv->data = &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 = &dev->dev; |
| drv->owner = THIS_MODULE; |
| |
| drv->minor = lirc_register_driver(drv); |
| if (drv->minor < 0) { |
| rc = -ENODEV; |
| goto lirc_register_failed; |
| } |
| |
| dev->raw->lirc.drv = drv; |
| dev->raw->lirc.dev = dev; |
| return 0; |
| |
| lirc_register_failed: |
| rbuf_init_failed: |
| kfree(rbuf); |
| rbuf_alloc_failed: |
| kfree(drv); |
| |
| return rc; |
| } |
| |
| static int ir_lirc_unregister(struct rc_dev *dev) |
| { |
| struct lirc_codec *lirc = &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 = RC_BIT_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"); |