diff options
Diffstat (limited to 'drivers/media/rc/rc-loopback.c')
| -rw-r--r-- | drivers/media/rc/rc-loopback.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/media/rc/rc-loopback.c b/drivers/media/rc/rc-loopback.c new file mode 100644 index 000000000000..49cee61d79c6 --- /dev/null +++ b/drivers/media/rc/rc-loopback.c @@ -0,0 +1,260 @@ +/* + * Loopback driver for rc-core, + * + * Copyright (c) 2010 David Härdeman <david@hardeman.nu> + * + * This driver receives TX data and passes it back as RX data, + * which is useful for (scripted) debugging of rc-core without + * having to use actual hardware. + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/device.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <media/rc-core.h> + +#define DRIVER_NAME "rc-loopback" +#define dprintk(x...) if (debug) printk(KERN_INFO DRIVER_NAME ": " x) +#define RXMASK_REGULAR 0x1 +#define RXMASK_LEARNING 0x2 + +static bool debug; + +struct loopback_dev { + struct rc_dev *dev; + u32 txmask; + u32 txcarrier; + u32 txduty; + bool idle; + bool learning; + bool carrierreport; + u32 rxcarriermin; + u32 rxcarriermax; +}; + +static struct loopback_dev loopdev; + +static int loop_set_tx_mask(struct rc_dev *dev, u32 mask) +{ + struct loopback_dev *lodev = dev->priv; + + if ((mask & (RXMASK_REGULAR | RXMASK_LEARNING)) != mask) { + dprintk("invalid tx mask: %u\n", mask); + return -EINVAL; + } + + dprintk("setting tx mask: %u\n", mask); + lodev->txmask = mask; + return 0; +} + +static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier) +{ + struct loopback_dev *lodev = dev->priv; + + dprintk("setting tx carrier: %u\n", carrier); + lodev->txcarrier = carrier; + return 0; +} + +static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle) +{ + struct loopback_dev *lodev = dev->priv; + + if (duty_cycle < 1 || duty_cycle > 99) { + dprintk("invalid duty cycle: %u\n", duty_cycle); + return -EINVAL; + } + + dprintk("setting duty cycle: %u\n", duty_cycle); + lodev->txduty = duty_cycle; + return 0; +} + +static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max) +{ + struct loopback_dev *lodev = dev->priv; + + if (min < 1 || min > max) { + dprintk("invalid rx carrier range %u to %u\n", min, max); + return -EINVAL; + } + + dprintk("setting rx carrier range %u to %u\n", min, max); + lodev->rxcarriermin = min; + lodev->rxcarriermax = max; + return 0; +} + +static int loop_tx_ir(struct rc_dev *dev, int *txbuf, u32 n) +{ + struct loopback_dev *lodev = dev->priv; + u32 rxmask; + unsigned count; + unsigned total_duration = 0; + unsigned i; + DEFINE_IR_RAW_EVENT(rawir); + + if (n == 0 || n % sizeof(int)) { + dprintk("invalid tx buffer size\n"); + return -EINVAL; + } + + count = n / sizeof(int); + for (i = 0; i < count; i++) + total_duration += abs(txbuf[i]); + + if (total_duration == 0) { + dprintk("invalid tx data, total duration zero\n"); + return -EINVAL; + } + + if (lodev->txcarrier < lodev->rxcarriermin || + lodev->txcarrier > lodev->rxcarriermax) { + dprintk("ignoring tx, carrier out of range\n"); + goto out; + } + + if (lodev->learning) + rxmask = RXMASK_LEARNING; + else + rxmask = RXMASK_REGULAR; + + if (!(rxmask & lodev->txmask)) { + dprintk("ignoring tx, rx mask mismatch\n"); + goto out; + } + + for (i = 0; i < count; i++) { + rawir.pulse = i % 2 ? false : true; + rawir.duration = abs(txbuf[i]) * 1000; + if (rawir.duration) + ir_raw_event_store_with_filter(dev, &rawir); + } + ir_raw_event_handle(dev); + +out: + /* Lirc expects this function to take as long as the total duration */ + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(usecs_to_jiffies(total_duration)); + return n; +} + +static void loop_set_idle(struct rc_dev *dev, bool enable) +{ + struct loopback_dev *lodev = dev->priv; + + if (lodev->idle != enable) { + dprintk("%sing idle mode\n", enable ? "enter" : "exit"); + lodev->idle = enable; + } +} + +static int loop_set_learning_mode(struct rc_dev *dev, int enable) +{ + struct loopback_dev *lodev = dev->priv; + + if (lodev->learning != enable) { + dprintk("%sing learning mode\n", enable ? "enter" : "exit"); + lodev->learning = !!enable; + } + + return 0; +} + +static int loop_set_carrier_report(struct rc_dev *dev, int enable) +{ + struct loopback_dev *lodev = dev->priv; + + if (lodev->carrierreport != enable) { + dprintk("%sabling carrier reports\n", enable ? "en" : "dis"); + lodev->carrierreport = !!enable; + } + + return 0; +} + +static int __init loop_init(void) +{ + struct rc_dev *rc; + int ret; + + rc = rc_allocate_device(); + if (!rc) { + printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n"); + return -ENOMEM; + } + + rc->input_name = "rc-core loopback device"; + rc->input_phys = "rc-core/virtual"; + rc->input_id.bustype = BUS_VIRTUAL; + rc->input_id.version = 1; + rc->driver_name = DRIVER_NAME; + rc->map_name = RC_MAP_EMPTY; + rc->priv = &loopdev; + rc->driver_type = RC_DRIVER_IR_RAW; + rc->allowed_protos = RC_TYPE_ALL; + rc->timeout = 100 * 1000 * 1000; /* 100 ms */ + rc->min_timeout = 1; + rc->max_timeout = UINT_MAX; + rc->rx_resolution = 1000; + rc->tx_resolution = 1000; + rc->s_tx_mask = loop_set_tx_mask; + rc->s_tx_carrier = loop_set_tx_carrier; + rc->s_tx_duty_cycle = loop_set_tx_duty_cycle; + rc->s_rx_carrier_range = loop_set_rx_carrier_range; + rc->tx_ir = loop_tx_ir; + rc->s_idle = loop_set_idle; + rc->s_learning_mode = loop_set_learning_mode; + rc->s_carrier_report = loop_set_carrier_report; + rc->priv = &loopdev; + + loopdev.txmask = RXMASK_REGULAR; + loopdev.txcarrier = 36000; + loopdev.txduty = 50; + loopdev.rxcarriermin = 1; + loopdev.rxcarriermax = ~0; + loopdev.idle = true; + loopdev.learning = false; + loopdev.carrierreport = false; + + ret = rc_register_device(rc); + if (ret < 0) { + printk(KERN_ERR DRIVER_NAME ": rc_dev registration failed\n"); + rc_free_device(rc); + return ret; + } + + loopdev.dev = rc; + return 0; +} + +static void __exit loop_exit(void) +{ + rc_unregister_device(loopdev.dev); +} + +module_init(loop_init); +module_exit(loop_exit); + +module_param(debug, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Enable debug messages"); + +MODULE_DESCRIPTION("Loopback device for rc-core debugging"); +MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); +MODULE_LICENSE("GPL"); |