[mirror_ubuntu-hirsute-kernel.git] / drivers / media / rc / rc-loopback.c

/*
 * 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.
 *
 */

#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 -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, unsigned *txbuf, unsigned count)
{
	struct loopback_dev *lodev = dev->priv;
	u32 rxmask;
	unsigned i;
	DEFINE_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] * 1000;
		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->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->allowed_protocols	= RC_BIT_ALL_IR_DECODER;
	rc->allowed_wakeup_protocols = RC_BIT_ALL_IR_ENCODER;
	rc->encode_wakeup	= true;
	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->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");
Commit	Line	Data
801c73c0 DH	1	/*
	2	* Loopback driver for rc-core,
	3	*
	4	* Copyright (c) 2010 David Härdeman <david@hardeman.nu>
	5	*
	6	* This driver receives TX data and passes it back as RX data,
	7	* which is useful for (scripted) debugging of rc-core without
	8	* having to use actual hardware.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
801c73c0 DH	20	*/
	21
	22	#include <linux/device.h>
	23	#include <linux/module.h>
	24	#include <linux/sched.h>
914535c0	25	#include <linux/slab.h>
801c73c0 DH	26	#include <media/rc-core.h>
	27
	28	#define DRIVER_NAME "rc-loopback"
	29	#define dprintk(x...) if (debug) printk(KERN_INFO DRIVER_NAME ": " x)
	30	#define RXMASK_REGULAR 0x1
	31	#define RXMASK_LEARNING 0x2
	32
	33	static bool debug;
	34
	35	struct loopback_dev {
	36	struct rc_dev *dev;
	37	u32 txmask;
	38	u32 txcarrier;
	39	u32 txduty;
	40	bool idle;
	41	bool learning;
	42	bool carrierreport;
	43	u32 rxcarriermin;
	44	u32 rxcarriermax;
	45	};
	46
	47	static struct loopback_dev loopdev;
	48
	49	static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)
	50	{
	51	struct loopback_dev *lodev = dev->priv;
	52
	53	if ((mask & (RXMASK_REGULAR \| RXMASK_LEARNING)) != mask) {
	54	dprintk("invalid tx mask: %u\n", mask);
	55	return -EINVAL;
	56	}
	57
	58	dprintk("setting tx mask: %u\n", mask);
	59	lodev->txmask = mask;
	60	return 0;
	61	}
	62
	63	static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)
	64	{
	65	struct loopback_dev *lodev = dev->priv;
	66
	67	dprintk("setting tx carrier: %u\n", carrier);
	68	lodev->txcarrier = carrier;
	69	return 0;
	70	}
	71
	72	static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
	73	{
	74	struct loopback_dev *lodev = dev->priv;
	75
	76	if (duty_cycle < 1 \|\| duty_cycle > 99) {
	77	dprintk("invalid duty cycle: %u\n", duty_cycle);
	78	return -EINVAL;
	79	}
	80
	81	dprintk("setting duty cycle: %u\n", duty_cycle);
	82	lodev->txduty = duty_cycle;
	83	return 0;
	84	}
	85
	86	static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
	87	{
	88	struct loopback_dev *lodev = dev->priv;
	89
90	if (min < 1 \|\| min > max) {
91	dprintk("invalid rx carrier range %u to %u\n", min, max);
92	return -EINVAL;
93	}
94
95	dprintk("setting rx carrier range %u to %u\n", min, max);
96	lodev->rxcarriermin = min;
97	lodev->rxcarriermax = max;
98	return 0;
99	}
100
5588dc2b	101	static int loop_tx_ir(struct rc_dev dev, unsigned txbuf, unsigned count)
801c73c0 DH	102	{
	103	struct loopback_dev *lodev = dev->priv;
	104	u32 rxmask;
801c73c0 DH	105	unsigned i;
	106	DEFINE_IR_RAW_EVENT(rawir);
	107
801c73c0 DH	108	if (lodev->txcarrier < lodev->rxcarriermin \|\|
	109	lodev->txcarrier > lodev->rxcarriermax) {
	110	dprintk("ignoring tx, carrier out of range\n");
	111	goto out;
	112	}
	113
	114	if (lodev->learning)
	115	rxmask = RXMASK_LEARNING;
	116	else
	117	rxmask = RXMASK_REGULAR;
	118
	119	if (!(rxmask & lodev->txmask)) {
	120	dprintk("ignoring tx, rx mask mismatch\n");
	121	goto out;
	122	}
	123
	124	for (i = 0; i < count; i++) {
	125	rawir.pulse = i % 2 ? false : true;
5588dc2b	126	rawir.duration = txbuf[i] * 1000;
801c73c0 DH	127	if (rawir.duration)
	128	ir_raw_event_store_with_filter(dev, &rawir);
	129	}
08ffff9f DH	130
	131	/* Fake a silence long enough to cause us to go idle */
	132	rawir.pulse = false;
	133	rawir.duration = dev->timeout;
	134	ir_raw_event_store_with_filter(dev, &rawir);
	135
801c73c0 DH	136	ir_raw_event_handle(dev);
	137
	138	out:
5588dc2b	139	return count;
801c73c0 DH	140	}
	141
	142	static void loop_set_idle(struct rc_dev *dev, bool enable)
	143	{
	144	struct loopback_dev *lodev = dev->priv;
	145
	146	if (lodev->idle != enable) {
	147	dprintk("%sing idle mode\n", enable ? "enter" : "exit");
	148	lodev->idle = enable;
	149	}
	150	}
	151
	152	static int loop_set_learning_mode(struct rc_dev *dev, int enable)
	153	{
	154	struct loopback_dev *lodev = dev->priv;
	155
	156	if (lodev->learning != enable) {
	157	dprintk("%sing learning mode\n", enable ? "enter" : "exit");
	158	lodev->learning = !!enable;
	159	}
	160
	161	return 0;
	162	}
	163
	164	static int loop_set_carrier_report(struct rc_dev *dev, int enable)
	165	{
	166	struct loopback_dev *lodev = dev->priv;
	167
	168	if (lodev->carrierreport != enable) {
	169	dprintk("%sabling carrier reports\n", enable ? "en" : "dis");
	170	lodev->carrierreport = !!enable;
	171	}
	172
	173	return 0;
	174	}
	175
914535c0 JH	176	static int loop_set_wakeup_filter(struct rc_dev *dev,
	177	struct rc_scancode_filter *sc)
	178	{
	179	static const unsigned int max = 512;
	180	struct ir_raw_event *raw;
	181	int ret;
	182	int i;
	183
	184	/* fine to disable filter */
	185	if (!sc->mask)
	186	return 0;
	187
	188	/* encode the specified filter and loop it back */
	189	raw = kmalloc_array(max, sizeof(*raw), GFP_KERNEL);
	190	if (!raw)
	191	return -ENOMEM;
	192
	193	ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max);
	194	/* still loop back the partial raw IR even if it's incomplete */
	195	if (ret == -ENOBUFS)
	196	ret = max;
	197	if (ret >= 0) {
	198	/* do the loopback */
	199	for (i = 0; i < ret; ++i)
	200	ir_raw_event_store(dev, &raw[i]);
	201	ir_raw_event_handle(dev);
	202
	203	ret = 0;
	204	}
	205
	206	kfree(raw);
	207
	208	return ret;
	209	}
	210
801c73c0 DH	211	static int __init loop_init(void)
	212	{
	213	struct rc_dev *rc;
	214	int ret;
	215
0f7499fd	216	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
801c73c0 DH	217	if (!rc) {
	218	printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n");
	219	return -ENOMEM;
	220	}
	221
	222	rc->input_name = "rc-core loopback device";
	223	rc->input_phys = "rc-core/virtual";
	224	rc->input_id.bustype = BUS_VIRTUAL;
	225	rc->input_id.version = 1;
	226	rc->driver_name = DRIVER_NAME;
	227	rc->map_name = RC_MAP_EMPTY;
	228	rc->priv = &loopdev;
8c34b5c4	229	rc->allowed_protocols = RC_BIT_ALL_IR_DECODER;
914535c0 JH	230	rc->allowed_wakeup_protocols = RC_BIT_ALL_IR_ENCODER;
914535c0 JH	231	rc->encode_wakeup = true;
801c73c0 DH	232	rc->timeout = 100 * 1000 * 1000; /* 100 ms */
	233	rc->min_timeout = 1;
	234	rc->max_timeout = UINT_MAX;
	235	rc->rx_resolution = 1000;
	236	rc->tx_resolution = 1000;
	237	rc->s_tx_mask = loop_set_tx_mask;
	238	rc->s_tx_carrier = loop_set_tx_carrier;
	239	rc->s_tx_duty_cycle = loop_set_tx_duty_cycle;
	240	rc->s_rx_carrier_range = loop_set_rx_carrier_range;
	241	rc->tx_ir = loop_tx_ir;
	242	rc->s_idle = loop_set_idle;
	243	rc->s_learning_mode = loop_set_learning_mode;
	244	rc->s_carrier_report = loop_set_carrier_report;
914535c0	245	rc->s_wakeup_filter = loop_set_wakeup_filter;
801c73c0 DH	246
	247	loopdev.txmask = RXMASK_REGULAR;
	248	loopdev.txcarrier = 36000;
	249	loopdev.txduty = 50;
	250	loopdev.rxcarriermin = 1;
	251	loopdev.rxcarriermax = ~0;
	252	loopdev.idle = true;
	253	loopdev.learning = false;
	254	loopdev.carrierreport = false;
	255
	256	ret = rc_register_device(rc);
	257	if (ret < 0) {
	258	printk(KERN_ERR DRIVER_NAME ": rc_dev registration failed\n");
	259	rc_free_device(rc);
	260	return ret;
	261	}
	262
	263	loopdev.dev = rc;
	264	return 0;
	265	}
	266
	267	static void __exit loop_exit(void)
	268	{
	269	rc_unregister_device(loopdev.dev);
	270	}
	271
	272	module_init(loop_init);
	273	module_exit(loop_exit);
	274
	275	module_param(debug, bool, S_IRUGO \| S_IWUSR);
	276	MODULE_PARM_DESC(debug, "Enable debug messages");
	277
	278	MODULE_DESCRIPTION("Loopback device for rc-core debugging");
	279	MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
	280	MODULE_LICENSE("GPL");