diff options
Diffstat (limited to 'drivers/media/IR/ir-lirc-codec.c')
| -rw-r--r-- | drivers/media/IR/ir-lirc-codec.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/drivers/media/IR/ir-lirc-codec.c b/drivers/media/IR/ir-lirc-codec.c new file mode 100644 index 000000000000..3ba482d96c4b --- /dev/null +++ b/drivers/media/IR/ir-lirc-codec.c @@ -0,0 +1,278 @@ +/* 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); + + 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 = 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 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(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, + .unlocked_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 (!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; + } + + 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"); |