diff options
Diffstat (limited to 'drivers/media/rc/ir-lirc-codec.c')
| -rw-r--r-- | drivers/media/rc/ir-lirc-codec.c | 406 |
1 files changed, 406 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 000000000000..1c5cc65ea1e1 --- /dev/null +++ b/drivers/media/rc/ir-lirc-codec.c @@ -0,0 +1,406 @@ +/* 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 <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->raw->enabled_protocols & RC_TYPE_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 *buf, + size_t n, loff_t *ppos) +{ + struct lirc_codec *lirc; + struct rc_dev *dev; + int *txbuf; /* buffer with values to transmit */ + int ret = 0; + size_t 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 || n % sizeof(int) != 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 = dev->tx_ir(dev, 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 rc_dev *dev; + 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, (__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 (!dev->s_tx_mask) + return -EINVAL; + + return dev->s_tx_mask(dev, val); + + case LIRC_SET_SEND_CARRIER: + if (!dev->s_tx_carrier) + return -EINVAL; + + 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, (__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 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_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"); |