| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * 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. |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/slab.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 2; |
| } |
| |
| 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, unsigned *txbuf, unsigned count) |
| { |
| struct loopback_dev *lodev = dev->priv; |
| u32 rxmask; |
| unsigned i; |
| struct ir_raw_event rawir = {}; |
| |
| 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 = txbuf[i]; |
| if (rawir.duration) |
| ir_raw_event_store_with_filter(dev, &rawir); |
| } |
| |
| /* Fake a silence long enough to cause us to go idle */ |
| rawir.pulse = false; |
| rawir.duration = dev->timeout; |
| ir_raw_event_store_with_filter(dev, &rawir); |
| |
| ir_raw_event_handle(dev); |
| |
| out: |
| return count; |
| } |
| |
| 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 loop_set_wakeup_filter(struct rc_dev *dev, |
| struct rc_scancode_filter *sc) |
| { |
| static const unsigned int max = 512; |
| struct ir_raw_event *raw; |
| int ret; |
| int i; |
| |
| /* fine to disable filter */ |
| if (!sc->mask) |
| return 0; |
| |
| /* encode the specified filter and loop it back */ |
| raw = kmalloc_array(max, sizeof(*raw), GFP_KERNEL); |
| if (!raw) |
| return -ENOMEM; |
| |
| ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max); |
| /* still loop back the partial raw IR even if it's incomplete */ |
| if (ret == -ENOBUFS) |
| ret = max; |
| if (ret >= 0) { |
| /* do the loopback */ |
| for (i = 0; i < ret; ++i) |
| ir_raw_event_store(dev, &raw[i]); |
| ir_raw_event_handle(dev); |
| |
| ret = 0; |
| } |
| |
| kfree(raw); |
| |
| return ret; |
| } |
| |
| static int __init loop_init(void) |
| { |
| struct rc_dev *rc; |
| int ret; |
| |
| rc = rc_allocate_device(RC_DRIVER_IR_RAW); |
| if (!rc) { |
| printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n"); |
| return -ENOMEM; |
| } |
| |
| rc->device_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->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; |
| rc->allowed_wakeup_protocols = RC_PROTO_BIT_ALL_IR_ENCODER; |
| rc->encode_wakeup = true; |
| rc->timeout = MS_TO_US(100); /* 100 ms */ |
| rc->min_timeout = 1; |
| rc->max_timeout = UINT_MAX; |
| rc->rx_resolution = 1; |
| rc->tx_resolution = 1; |
| 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->s_wakeup_filter = loop_set_wakeup_filter; |
| |
| 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"); |