[deliverable/linux.git] / drivers / media / rc / iguanair.c

/*
 * IguanaWorks USB IR Transceiver support
 *
 * Copyright (C) 2012 Sean Young <sean@mess.org>
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <media/rc-core.h>

#define DRIVER_NAME "iguanair"
#define BUF_SIZE 152

struct iguanair {
	struct rc_dev *rc;

	struct device *dev;
	struct usb_device *udev;

	uint16_t version;
	uint8_t bufsize;
	uint8_t cycle_overhead;

	struct mutex lock;

	/* receiver support */
	bool receiver_on;
	dma_addr_t dma_in, dma_out;
	uint8_t *buf_in;
	struct urb *urb_in, *urb_out;
	struct completion completion;

	/* transmit support */
	bool tx_overflow;
	uint32_t carrier;
	struct send_packet *packet;

	char name[64];
	char phys[64];
};

#define CMD_GET_VERSION		0x01
#define CMD_GET_BUFSIZE		0x11
#define CMD_GET_FEATURES	0x10
#define CMD_SEND		0x15
#define CMD_EXECUTE		0x1f
#define CMD_RX_OVERFLOW		0x31
#define CMD_TX_OVERFLOW		0x32
#define CMD_RECEIVER_ON		0x12
#define CMD_RECEIVER_OFF	0x14

#define DIR_IN			0xdc
#define DIR_OUT			0xcd

#define MAX_IN_PACKET		8u
#define MAX_OUT_PACKET		(sizeof(struct send_packet) + BUF_SIZE)
#define TIMEOUT			1000
#define RX_RESOLUTION		21333

struct packet {
	uint16_t start;
	uint8_t direction;
	uint8_t cmd;
};

struct send_packet {
	struct packet header;
	uint8_t length;
	uint8_t channels;
	uint8_t busy7;
	uint8_t busy4;
	uint8_t payload[0];
};

static void process_ir_data(struct iguanair *ir, unsigned len)
{
	if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
		switch (ir->buf_in[3]) {
		case CMD_GET_VERSION:
			if (len == 6) {
				ir->version = (ir->buf_in[5] << 8) |
							ir->buf_in[4];
				complete(&ir->completion);
			}
			break;
		case CMD_GET_BUFSIZE:
			if (len >= 5) {
				ir->bufsize = ir->buf_in[4];
				complete(&ir->completion);
			}
			break;
		case CMD_GET_FEATURES:
			if (len > 5) {
				ir->cycle_overhead = ir->buf_in[5];
				complete(&ir->completion);
			}
			break;
		case CMD_TX_OVERFLOW:
			ir->tx_overflow = true;
		case CMD_RECEIVER_OFF:
		case CMD_RECEIVER_ON:
		case CMD_SEND:
			complete(&ir->completion);
			break;
		case CMD_RX_OVERFLOW:
			dev_warn(ir->dev, "receive overflow\n");
			ir_raw_event_reset(ir->rc);
			break;
		default:
			dev_warn(ir->dev, "control code %02x received\n",
							ir->buf_in[3]);
			break;
		}
	} else if (len >= 7) {
		DEFINE_IR_RAW_EVENT(rawir);
		unsigned i;
		bool event = false;

		init_ir_raw_event(&rawir);

		for (i = 0; i < 7; i++) {
			if (ir->buf_in[i] == 0x80) {
				rawir.pulse = false;
				rawir.duration = US_TO_NS(21845);
			} else {
				rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
				rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
								 RX_RESOLUTION;
			}

			if (ir_raw_event_store_with_filter(ir->rc, &rawir))
				event = true;
		}

		if (event)
			ir_raw_event_handle(ir->rc);
	}
}

static void iguanair_rx(struct urb *urb)
{
	struct iguanair *ir;
	int rc;

	if (!urb)
		return;

	ir = urb->context;
	if (!ir) {
		usb_unlink_urb(urb);
		return;
	}

	switch (urb->status) {
	case 0:
		process_ir_data(ir, urb->actual_length);
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		usb_unlink_urb(urb);
		return;
	case -EPIPE:
	default:
		dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
		break;
	}

	rc = usb_submit_urb(urb, GFP_ATOMIC);
	if (rc && rc != -ENODEV)
		dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
}

static void iguanair_irq_out(struct urb *urb)
{
	struct iguanair *ir = urb->context;

	if (urb->status)
		dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
}

static int iguanair_send(struct iguanair *ir, unsigned size)
{
	int rc;

	INIT_COMPLETION(ir->completion);

	ir->urb_out->transfer_buffer_length = size;
	rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
	if (rc)
		return rc;

	if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
		return -ETIMEDOUT;

	return rc;
}

static int iguanair_get_features(struct iguanair *ir)
{
	int rc;

	ir->packet->header.start = 0;
	ir->packet->header.direction = DIR_OUT;
	ir->packet->header.cmd = CMD_GET_VERSION;

	rc = iguanair_send(ir, sizeof(ir->packet->header));
	if (rc) {
		dev_info(ir->dev, "failed to get version\n");
		goto out;
	}

	if (ir->version < 0x205) {
		dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
		rc = -ENODEV;
		goto out;
	}

	ir->bufsize = 150;
	ir->cycle_overhead = 65;

	ir->packet->header.cmd = CMD_GET_BUFSIZE;

	rc = iguanair_send(ir, sizeof(ir->packet->header));
	if (rc) {
		dev_info(ir->dev, "failed to get buffer size\n");
		goto out;
	}

	if (ir->bufsize > BUF_SIZE) {
		dev_info(ir->dev, "buffer size %u larger than expected\n",
								ir->bufsize);
		ir->bufsize = BUF_SIZE;
	}

	ir->packet->header.cmd = CMD_GET_FEATURES;

	rc = iguanair_send(ir, sizeof(ir->packet->header));
	if (rc) {
		dev_info(ir->dev, "failed to get features\n");
		goto out;
	}

out:
	return rc;
}

static int iguanair_receiver(struct iguanair *ir, bool enable)
{
	int rc;

	ir->packet->header.start = 0;
	ir->packet->header.direction = DIR_OUT;
	ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;

	if (enable)
		ir_raw_event_reset(ir->rc);

	rc = iguanair_send(ir, sizeof(ir->packet->header));

	return rc;
}

/*
 * The iguana ir creates the carrier by busy spinning after each pulse or
 * space. This is counted in CPU cycles, with the CPU running at 24MHz. It is
 * broken down into 7-cycles and 4-cyles delays, with a preference for
 * 4-cycle delays.
 */
static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
{
	struct iguanair *ir = dev->priv;

	if (carrier < 25000 || carrier > 150000)
		return -EINVAL;

	mutex_lock(&ir->lock);

	if (carrier != ir->carrier) {
		uint32_t cycles, fours, sevens;

		ir->carrier = carrier;

		cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
							ir->cycle_overhead;

		/*  make up the the remainer of 4-cycle blocks */
		switch (cycles & 3) {
		case 0:
			sevens = 0;
			break;
		case 1:
			sevens = 3;
			break;
		case 2:
			sevens = 2;
			break;
		case 3:
			sevens = 1;
			break;
		}

		fours = (cycles - sevens * 7) / 4;

		/* magic happens here */
		ir->packet->busy7 = (4 - sevens) * 2;
		ir->packet->busy4 = 110 - fours;
	}

	mutex_unlock(&ir->lock);

	return carrier;
}

static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
{
	struct iguanair *ir = dev->priv;

	if (mask > 15)
		return 4;

	mutex_lock(&ir->lock);
	ir->packet->channels = mask << 4;
	mutex_unlock(&ir->lock);

	return 0;
}

static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
{
	struct iguanair *ir = dev->priv;
	uint8_t space;
	unsigned i, size, periods, bytes;
	int rc;

	mutex_lock(&ir->lock);

	/* convert from us to carrier periods */
	for (i = space = size = 0; i < count; i++) {
		periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
		bytes = DIV_ROUND_UP(periods, 127);
		if (size + bytes > ir->bufsize) {
			count = i;
			break;
		}
		while (periods > 127) {
			ir->packet->payload[size++] = 127 | space;
			periods -= 127;
		}

		ir->packet->payload[size++] = periods | space;
		space ^= 0x80;
	}

	if (count == 0) {
		rc = -EINVAL;
		goto out;
	}

	ir->packet->header.start = 0;
	ir->packet->header.direction = DIR_OUT;
	ir->packet->header.cmd = CMD_SEND;
	ir->packet->length = size;

	ir->tx_overflow = false;

	rc = iguanair_send(ir, sizeof(*ir->packet) + size);

	if (rc == 0 && ir->tx_overflow)
		rc = -EOVERFLOW;

out:
	mutex_unlock(&ir->lock);

	return rc ? rc : count;
}

static int iguanair_open(struct rc_dev *rdev)
{
	struct iguanair *ir = rdev->priv;
	int rc;

	mutex_lock(&ir->lock);

	rc = iguanair_receiver(ir, true);
	if (rc == 0)
		ir->receiver_on = true;

	mutex_unlock(&ir->lock);

	return rc;
}

static void iguanair_close(struct rc_dev *rdev)
{
	struct iguanair *ir = rdev->priv;
	int rc;

	mutex_lock(&ir->lock);

	rc = iguanair_receiver(ir, false);
	ir->receiver_on = false;
	if (rc && rc != -ENODEV)
		dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);

	mutex_unlock(&ir->lock);
}

static int __devinit iguanair_probe(struct usb_interface *intf,
						const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct iguanair *ir;
	struct rc_dev *rc;
	int ret, pipein, pipeout;
	struct usb_host_interface *idesc;

	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	rc = rc_allocate_device();
	if (!ir || !rc) {
		ret = -ENOMEM;
		goto out;
	}

	ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
								&ir->dma_in);
	ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
								&ir->dma_out);
	ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
	ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);

	if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
		ret = -ENOMEM;
		goto out;
	}

	idesc = intf->altsetting;

	if (idesc->desc.bNumEndpoints < 2) {
		ret = -ENODEV;
		goto out;
	}

	ir->rc = rc;
	ir->dev = &intf->dev;
	ir->udev = udev;
	mutex_init(&ir->lock);

	init_completion(&ir->completion);
	pipeout = usb_sndintpipe(udev,
				idesc->endpoint[1].desc.bEndpointAddress);
	usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
						iguanair_irq_out, ir, 1);
	ir->urb_out->transfer_dma = ir->dma_out;
	ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
	usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
							 iguanair_rx, ir, 1);
	ir->urb_in->transfer_dma = ir->dma_in;
	ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
	if (ret) {
		dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
		goto out;
	}

	ret = iguanair_get_features(ir);
	if (ret)
		goto out2;

	snprintf(ir->name, sizeof(ir->name),
		"IguanaWorks USB IR Transceiver version 0x%04x", ir->version);

	usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));

	rc->input_name = ir->name;
	rc->input_phys = ir->phys;
	usb_to_input_id(ir->udev, &rc->input_id);
	rc->dev.parent = &intf->dev;
	rc->driver_type = RC_DRIVER_IR_RAW;
	rc->allowed_protos = RC_BIT_ALL;
	rc->priv = ir;
	rc->open = iguanair_open;
	rc->close = iguanair_close;
	rc->s_tx_mask = iguanair_set_tx_mask;
	rc->s_tx_carrier = iguanair_set_tx_carrier;
	rc->tx_ir = iguanair_tx;
	rc->driver_name = DRIVER_NAME;
	rc->map_name = RC_MAP_RC6_MCE;
	rc->timeout = MS_TO_NS(100);
	rc->rx_resolution = RX_RESOLUTION;

	iguanair_set_tx_carrier(rc, 38000);

	ret = rc_register_device(rc);
	if (ret < 0) {
		dev_err(&intf->dev, "failed to register rc device %d", ret);
		goto out2;
	}

	usb_set_intfdata(intf, ir);

	return 0;
out2:
	usb_kill_urb(ir->urb_in);
	usb_kill_urb(ir->urb_out);
out:
	if (ir) {
		usb_free_urb(ir->urb_in);
		usb_free_urb(ir->urb_out);
		usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
		usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
								ir->dma_out);
	}
	rc_free_device(rc);
	kfree(ir);
	return ret;
}

static void __devexit iguanair_disconnect(struct usb_interface *intf)
{
	struct iguanair *ir = usb_get_intfdata(intf);

	rc_unregister_device(ir->rc);
	usb_set_intfdata(intf, NULL);
	usb_kill_urb(ir->urb_in);
	usb_kill_urb(ir->urb_out);
	usb_free_urb(ir->urb_in);
	usb_free_urb(ir->urb_out);
	usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
	usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
	kfree(ir);
}

static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct iguanair *ir = usb_get_intfdata(intf);
	int rc = 0;

	mutex_lock(&ir->lock);

	if (ir->receiver_on) {
		rc = iguanair_receiver(ir, false);
		if (rc)
			dev_warn(ir->dev, "failed to disable receiver for suspend\n");
	}

	usb_kill_urb(ir->urb_in);
	usb_kill_urb(ir->urb_out);

	mutex_unlock(&ir->lock);

	return rc;
}

static int iguanair_resume(struct usb_interface *intf)
{
	struct iguanair *ir = usb_get_intfdata(intf);
	int rc = 0;

	mutex_lock(&ir->lock);

	rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
	if (rc)
		dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);

	if (ir->receiver_on) {
		rc = iguanair_receiver(ir, true);
		if (rc)
			dev_warn(ir->dev, "failed to enable receiver after resume\n");
	}

	mutex_unlock(&ir->lock);

	return rc;
}

static const struct usb_device_id iguanair_table[] = {
	{ USB_DEVICE(0x1781, 0x0938) },
	{ }
};

static struct usb_driver iguanair_driver = {
	.name =	DRIVER_NAME,
	.probe = iguanair_probe,
	.disconnect = __devexit_p(iguanair_disconnect),
	.suspend = iguanair_suspend,
	.resume = iguanair_resume,
	.reset_resume = iguanair_resume,
	.id_table = iguanair_table,
	.soft_unbind = 1	/* we want to disable receiver on unbind */
};

module_usb_driver(iguanair_driver);

MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
MODULE_AUTHOR("Sean Young <sean@mess.org>");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, iguanair_table);
Commit	Line	Data
26ff6313 SY	1	/*
	2	* IguanaWorks USB IR Transceiver support
	3	*
	4	* Copyright (C) 2012 Sean Young <sean@mess.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/device.h>
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/usb.h>
	25	#include <linux/usb/input.h>
	26	#include <linux/slab.h>
	27	#include <linux/completion.h>
	28	#include <media/rc-core.h>
	29
	30	#define DRIVER_NAME "iguanair"
48b0fa6a	31	#define BUF_SIZE 152
26ff6313 SY	32
	33	struct iguanair {
	34	struct rc_dev *rc;
	35
	36	struct device *dev;
	37	struct usb_device *udev;
	38
0797b480	39	uint16_t version;
26ff6313	40	uint8_t bufsize;
48b0fa6a	41	uint8_t cycle_overhead;
26ff6313 SY	42
	43	struct mutex lock;
	44
	45	/* receiver support */
	46	bool receiver_on;
48b0fa6a	47	dma_addr_t dma_in, dma_out;
26ff6313	48	uint8_t *buf_in;
48b0fa6a	49	struct urb urb_in, urb_out;
26ff6313 SY	50	struct completion completion;
	51
	52	/* transmit support */
	53	bool tx_overflow;
	54	uint32_t carrier;
48b0fa6a	55	struct send_packet *packet;
26ff6313 SY	56
	57	char name[64];
	58	char phys[64];
	59	};
	60
	61	#define CMD_GET_VERSION 0x01
	62	#define CMD_GET_BUFSIZE 0x11
	63	#define CMD_GET_FEATURES 0x10
	64	#define CMD_SEND 0x15
	65	#define CMD_EXECUTE 0x1f
	66	#define CMD_RX_OVERFLOW 0x31
	67	#define CMD_TX_OVERFLOW 0x32
	68	#define CMD_RECEIVER_ON 0x12
	69	#define CMD_RECEIVER_OFF 0x14
	70
	71	#define DIR_IN 0xdc
	72	#define DIR_OUT 0xcd
	73
48b0fa6a SY	74	#define MAX_IN_PACKET 8u
48b0fa6a SY	75	#define MAX_OUT_PACKET (sizeof(struct send_packet) + BUF_SIZE)
26ff6313	76	#define TIMEOUT 1000
2eec676c	77	#define RX_RESOLUTION 21333
26ff6313 SY	78
	79	struct packet {
	80	uint16_t start;
	81	uint8_t direction;
	82	uint8_t cmd;
	83	};
	84
26ff6313 SY	85	struct send_packet {
	86	struct packet header;
	87	uint8_t length;
	88	uint8_t channels;
	89	uint8_t busy7;
	90	uint8_t busy4;
	91	uint8_t payload[0];
	92	};
	93
	94	static void process_ir_data(struct iguanair *ir, unsigned len)
	95	{
	96	if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
	97	switch (ir->buf_in[3]) {
e99a7cfe SY	98	case CMD_GET_VERSION:
e99a7cfe SY	99	if (len == 6) {
0797b480 SY	100	ir->version = (ir->buf_in[5] << 8) \|
0797b480 SY	101	ir->buf_in[4];
e99a7cfe SY	102	complete(&ir->completion);
	103	}
	104	break;
	105	case CMD_GET_BUFSIZE:
	106	if (len >= 5) {
	107	ir->bufsize = ir->buf_in[4];
	108	complete(&ir->completion);
	109	}
	110	break;
	111	case CMD_GET_FEATURES:
	112	if (len > 5) {
0797b480	113	ir->cycle_overhead = ir->buf_in[5];
e99a7cfe SY	114	complete(&ir->completion);
	115	}
	116	break;
26ff6313 SY	117	case CMD_TX_OVERFLOW:
	118	ir->tx_overflow = true;
	119	case CMD_RECEIVER_OFF:
	120	case CMD_RECEIVER_ON:
	121	case CMD_SEND:
	122	complete(&ir->completion);
	123	break;
	124	case CMD_RX_OVERFLOW:
	125	dev_warn(ir->dev, "receive overflow\n");
116e4f59	126	ir_raw_event_reset(ir->rc);
26ff6313 SY	127	break;
	128	default:
	129	dev_warn(ir->dev, "control code %02x received\n",
	130	ir->buf_in[3]);
	131	break;
	132	}
	133	} else if (len >= 7) {
	134	DEFINE_IR_RAW_EVENT(rawir);
	135	unsigned i;
b83bfd1b	136	bool event = false;
26ff6313 SY	137
	138	init_ir_raw_event(&rawir);
	139
	140	for (i = 0; i < 7; i++) {
	141	if (ir->buf_in[i] == 0x80) {
	142	rawir.pulse = false;
	143	rawir.duration = US_TO_NS(21845);
	144	} else {
	145	rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
	146	rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
2eec676c	147	RX_RESOLUTION;
26ff6313 SY	148	}
26ff6313 SY	149
b83bfd1b SY	150	if (ir_raw_event_store_with_filter(ir->rc, &rawir))
b83bfd1b SY	151	event = true;
26ff6313 SY	152	}
26ff6313 SY	153
b83bfd1b SY	154	if (event)
b83bfd1b SY	155	ir_raw_event_handle(ir->rc);
26ff6313 SY	156	}
	157	}
	158
	159	static void iguanair_rx(struct urb *urb)
	160	{
	161	struct iguanair *ir;
7c0bd96b	162	int rc;
26ff6313 SY	163
	164	if (!urb)
	165	return;
	166
	167	ir = urb->context;
	168	if (!ir) {
	169	usb_unlink_urb(urb);
	170	return;
	171	}
	172
	173	switch (urb->status) {
	174	case 0:
	175	process_ir_data(ir, urb->actual_length);
	176	break;
	177	case -ECONNRESET:
	178	case -ENOENT:
	179	case -ESHUTDOWN:
	180	usb_unlink_urb(urb);
	181	return;
	182	case -EPIPE:
	183	default:
	184	dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
	185	break;
	186	}
	187
7c0bd96b SY	188	rc = usb_submit_urb(urb, GFP_ATOMIC);
	189	if (rc && rc != -ENODEV)
	190	dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
26ff6313 SY	191	}
26ff6313 SY	192
48b0fa6a	193	static void iguanair_irq_out(struct urb *urb)
26ff6313	194	{
48b0fa6a SY	195	struct iguanair *ir = urb->context;
	196
	197	if (urb->status)
	198	dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
	199	}
	200
	201	static int iguanair_send(struct iguanair *ir, unsigned size)
	202	{
	203	int rc;
26ff6313	204
e99a7cfe	205	INIT_COMPLETION(ir->completion);
26ff6313	206
48b0fa6a SY	207	ir->urb_out->transfer_buffer_length = size;
48b0fa6a SY	208	rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
e99a7cfe SY	209	if (rc)
e99a7cfe SY	210	return rc;
26ff6313	211
e99a7cfe SY	212	if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
e99a7cfe SY	213	return -ETIMEDOUT;
26ff6313 SY	214
	215	return rc;
	216	}
	217
	218	static int iguanair_get_features(struct iguanair *ir)
	219	{
e99a7cfe	220	int rc;
26ff6313	221
48b0fa6a SY	222	ir->packet->header.start = 0;
	223	ir->packet->header.direction = DIR_OUT;
	224	ir->packet->header.cmd = CMD_GET_VERSION;
26ff6313	225
48b0fa6a	226	rc = iguanair_send(ir, sizeof(ir->packet->header));
26ff6313 SY	227	if (rc) {
	228	dev_info(ir->dev, "failed to get version\n");
	229	goto out;
	230	}
	231
0797b480 SY	232	if (ir->version < 0x205) {
	233	dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
	234	rc = -ENODEV;
	235	goto out;
	236	}
	237
26ff6313 SY	238	ir->bufsize = 150;
	239	ir->cycle_overhead = 65;
	240
48b0fa6a	241	ir->packet->header.cmd = CMD_GET_BUFSIZE;
26ff6313	242
48b0fa6a	243	rc = iguanair_send(ir, sizeof(ir->packet->header));
26ff6313 SY	244	if (rc) {
	245	dev_info(ir->dev, "failed to get buffer size\n");
	246	goto out;
	247	}
	248
48b0fa6a SY	249	if (ir->bufsize > BUF_SIZE) {
	250	dev_info(ir->dev, "buffer size %u larger than expected\n",
	251	ir->bufsize);
	252	ir->bufsize = BUF_SIZE;
	253	}
	254
	255	ir->packet->header.cmd = CMD_GET_FEATURES;
26ff6313	256
48b0fa6a	257	rc = iguanair_send(ir, sizeof(ir->packet->header));
26ff6313 SY	258	if (rc) {
	259	dev_info(ir->dev, "failed to get features\n");
	260	goto out;
	261	}
	262
26ff6313 SY	263	out:
	264	return rc;
	265	}
	266
	267	static int iguanair_receiver(struct iguanair *ir, bool enable)
	268	{
48b0fa6a SY	269	int rc;
	270
	271	ir->packet->header.start = 0;
	272	ir->packet->header.direction = DIR_OUT;
	273	ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
26ff6313	274
116e4f59 SY	275	if (enable)
	276	ir_raw_event_reset(ir->rc);
	277
48b0fa6a SY	278	rc = iguanair_send(ir, sizeof(ir->packet->header));
	279
	280	return rc;
26ff6313 SY	281	}
	282
	283	/*
	284	* The iguana ir creates the carrier by busy spinning after each pulse or
	285	* space. This is counted in CPU cycles, with the CPU running at 24MHz. It is
	286	* broken down into 7-cycles and 4-cyles delays, with a preference for
	287	* 4-cycle delays.
	288	*/
	289	static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
	290	{
	291	struct iguanair *ir = dev->priv;
	292
	293	if (carrier < 25000 \|\| carrier > 150000)
	294	return -EINVAL;
	295
	296	mutex_lock(&ir->lock);
	297
	298	if (carrier != ir->carrier) {
	299	uint32_t cycles, fours, sevens;
	300
	301	ir->carrier = carrier;
	302
	303	cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
	304	ir->cycle_overhead;
	305
	306	/* make up the the remainer of 4-cycle blocks */
	307	switch (cycles & 3) {
	308	case 0:
	309	sevens = 0;
	310	break;
	311	case 1:
	312	sevens = 3;
	313	break;
	314	case 2:
	315	sevens = 2;
	316	break;
	317	case 3:
	318	sevens = 1;
	319	break;
	320	}
	321
	322	fours = (cycles - sevens * 7) / 4;
	323
	324	/* magic happens here */
48b0fa6a SY	325	ir->packet->busy7 = (4 - sevens) * 2;
48b0fa6a SY	326	ir->packet->busy4 = 110 - fours;
26ff6313 SY	327	}
	328
	329	mutex_unlock(&ir->lock);
	330
	331	return carrier;
	332	}
	333
	334	static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
	335	{
	336	struct iguanair *ir = dev->priv;
	337
	338	if (mask > 15)
	339	return 4;
	340
	341	mutex_lock(&ir->lock);
48b0fa6a	342	ir->packet->channels = mask << 4;
26ff6313 SY	343	mutex_unlock(&ir->lock);
	344
	345	return 0;
	346	}
	347
	348	static int iguanair_tx(struct rc_dev dev, unsigned txbuf, unsigned count)
	349	{
	350	struct iguanair *ir = dev->priv;
3920631c SY	351	uint8_t space;
	352	unsigned i, size, periods, bytes;
	353	int rc;
26ff6313 SY	354
	355	mutex_lock(&ir->lock);
	356
	357	/* convert from us to carrier periods */
3920631c SY	358	for (i = space = size = 0; i < count; i++) {
	359	periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
	360	bytes = DIV_ROUND_UP(periods, 127);
884bfd08 SY	361	if (size + bytes > ir->bufsize) {
	362	count = i;
	363	break;
	364	}
3920631c	365	while (periods > 127) {
48b0fa6a	366	ir->packet->payload[size++] = 127 \| space;
3920631c SY	367	periods -= 127;
	368	}
	369
48b0fa6a	370	ir->packet->payload[size++] = periods \| space;
3920631c	371	space ^= 0x80;
26ff6313 SY	372	}
26ff6313 SY	373
884bfd08 SY	374	if (count == 0) {
884bfd08 SY	375	rc = -EINVAL;
26ff6313 SY	376	goto out;
	377	}
	378
48b0fa6a SY	379	ir->packet->header.start = 0;
	380	ir->packet->header.direction = DIR_OUT;
	381	ir->packet->header.cmd = CMD_SEND;
	382	ir->packet->length = size;
26ff6313 SY	383
	384	ir->tx_overflow = false;
	385
48b0fa6a	386	rc = iguanair_send(ir, sizeof(*ir->packet) + size);
26ff6313	387
e99a7cfe SY	388	if (rc == 0 && ir->tx_overflow)
e99a7cfe SY	389	rc = -EOVERFLOW;
26ff6313	390
26ff6313 SY	391	out:
26ff6313 SY	392	mutex_unlock(&ir->lock);
26ff6313	393
884bfd08	394	return rc ? rc : count;
26ff6313 SY	395	}
	396
	397	static int iguanair_open(struct rc_dev *rdev)
	398	{
	399	struct iguanair *ir = rdev->priv;
	400	int rc;
	401
	402	mutex_lock(&ir->lock);
	403
26ff6313 SY	404	rc = iguanair_receiver(ir, true);
	405	if (rc == 0)
	406	ir->receiver_on = true;
	407
	408	mutex_unlock(&ir->lock);
	409
	410	return rc;
	411	}
	412
	413	static void iguanair_close(struct rc_dev *rdev)
	414	{
	415	struct iguanair *ir = rdev->priv;
	416	int rc;
	417
	418	mutex_lock(&ir->lock);
	419
	420	rc = iguanair_receiver(ir, false);
	421	ir->receiver_on = false;
7c0bd96b	422	if (rc && rc != -ENODEV)
26ff6313 SY	423	dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
26ff6313 SY	424
26ff6313 SY	425	mutex_unlock(&ir->lock);
	426	}
	427
	428	static int __devinit iguanair_probe(struct usb_interface *intf,
	429	const struct usb_device_id *id)
	430	{
	431	struct usb_device *udev = interface_to_usbdev(intf);
	432	struct iguanair *ir;
	433	struct rc_dev *rc;
48b0fa6a	434	int ret, pipein, pipeout;
26ff6313 SY	435	struct usb_host_interface *idesc;
	436
	437	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	438	rc = rc_allocate_device();
	439	if (!ir \|\| !rc) {
884bfd08	440	ret = -ENOMEM;
26ff6313 SY	441	goto out;
	442	}
	443
48b0fa6a	444	ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
26ff6313	445	&ir->dma_in);
48b0fa6a SY	446	ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
48b0fa6a SY	447	&ir->dma_out);
26ff6313	448	ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
48b0fa6a	449	ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
26ff6313	450
48b0fa6a	451	if (!ir->buf_in \|\| !ir->packet \|\| !ir->urb_in \|\| !ir->urb_out) {
884bfd08	452	ret = -ENOMEM;
26ff6313 SY	453	goto out;
	454	}
	455
	456	idesc = intf->altsetting;
	457
	458	if (idesc->desc.bNumEndpoints < 2) {
	459	ret = -ENODEV;
	460	goto out;
	461	}
	462
	463	ir->rc = rc;
	464	ir->dev = &intf->dev;
	465	ir->udev = udev;
26ff6313	466	mutex_init(&ir->lock);
48b0fa6a	467
26ff6313	468	init_completion(&ir->completion);
48b0fa6a SY	469	pipeout = usb_sndintpipe(udev,
	470	idesc->endpoint[1].desc.bEndpointAddress);
	471	usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
	472	iguanair_irq_out, ir, 1);
	473	ir->urb_out->transfer_dma = ir->dma_out;
	474	ir->urb_out->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
26ff6313	475
e99a7cfe	476	pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
48b0fa6a	477	usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
64058383	478	iguanair_rx, ir, 1);
26ff6313 SY	479	ir->urb_in->transfer_dma = ir->dma_in;
	480	ir->urb_in->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	481
e99a7cfe SY	482	ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
	483	if (ret) {
	484	dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
	485	goto out;
	486	}
	487
	488	ret = iguanair_get_features(ir);
	489	if (ret)
	490	goto out2;
	491
26ff6313	492	snprintf(ir->name, sizeof(ir->name),
0797b480	493	"IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
26ff6313 SY	494
	495	usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
	496
	497	rc->input_name = ir->name;
	498	rc->input_phys = ir->phys;
	499	usb_to_input_id(ir->udev, &rc->input_id);
	500	rc->dev.parent = &intf->dev;
	501	rc->driver_type = RC_DRIVER_IR_RAW;
c003ab1b	502	rc->allowed_protos = RC_BIT_ALL;
26ff6313 SY	503	rc->priv = ir;
	504	rc->open = iguanair_open;
	505	rc->close = iguanair_close;
	506	rc->s_tx_mask = iguanair_set_tx_mask;
	507	rc->s_tx_carrier = iguanair_set_tx_carrier;
	508	rc->tx_ir = iguanair_tx;
	509	rc->driver_name = DRIVER_NAME;
2eec676c SY	510	rc->map_name = RC_MAP_RC6_MCE;
	511	rc->timeout = MS_TO_NS(100);
	512	rc->rx_resolution = RX_RESOLUTION;
26ff6313 SY	513
	514	iguanair_set_tx_carrier(rc, 38000);
	515
	516	ret = rc_register_device(rc);
	517	if (ret < 0) {
	518	dev_err(&intf->dev, "failed to register rc device %d", ret);
e99a7cfe	519	goto out2;
26ff6313 SY	520	}
	521
	522	usb_set_intfdata(intf, ir);
	523
26ff6313	524	return 0;
e99a7cfe SY	525	out2:
e99a7cfe SY	526	usb_kill_urb(ir->urb_in);
48b0fa6a	527	usb_kill_urb(ir->urb_out);
26ff6313 SY	528	out:
	529	if (ir) {
	530	usb_free_urb(ir->urb_in);
48b0fa6a SY	531	usb_free_urb(ir->urb_out);
	532	usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
	533	usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
	534	ir->dma_out);
26ff6313 SY	535	}
	536	rc_free_device(rc);
	537	kfree(ir);
	538	return ret;
	539	}
	540
	541	static void __devexit iguanair_disconnect(struct usb_interface *intf)
	542	{
	543	struct iguanair *ir = usb_get_intfdata(intf);
	544
7c0bd96b	545	rc_unregister_device(ir->rc);
26ff6313	546	usb_set_intfdata(intf, NULL);
26ff6313	547	usb_kill_urb(ir->urb_in);
48b0fa6a	548	usb_kill_urb(ir->urb_out);
26ff6313	549	usb_free_urb(ir->urb_in);
48b0fa6a SY	550	usb_free_urb(ir->urb_out);
	551	usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
	552	usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
26ff6313 SY	553	kfree(ir);
	554	}
	555
	556	static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
	557	{
	558	struct iguanair *ir = usb_get_intfdata(intf);
	559	int rc = 0;
	560
	561	mutex_lock(&ir->lock);
	562
	563	if (ir->receiver_on) {
	564	rc = iguanair_receiver(ir, false);
	565	if (rc)
	566	dev_warn(ir->dev, "failed to disable receiver for suspend\n");
	567	}
	568
7c0bd96b	569	usb_kill_urb(ir->urb_in);
48b0fa6a	570	usb_kill_urb(ir->urb_out);
7c0bd96b	571
26ff6313 SY	572	mutex_unlock(&ir->lock);
	573
	574	return rc;
	575	}
	576
	577	static int iguanair_resume(struct usb_interface *intf)
	578	{
	579	struct iguanair *ir = usb_get_intfdata(intf);
	580	int rc = 0;
	581
	582	mutex_lock(&ir->lock);
	583
7c0bd96b SY	584	rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
	585	if (rc)
	586	dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
	587
26ff6313 SY	588	if (ir->receiver_on) {
	589	rc = iguanair_receiver(ir, true);
	590	if (rc)
	591	dev_warn(ir->dev, "failed to enable receiver after resume\n");
	592	}
	593
	594	mutex_unlock(&ir->lock);
	595
	596	return rc;
	597	}
	598
	599	static const struct usb_device_id iguanair_table[] = {
	600	{ USB_DEVICE(0x1781, 0x0938) },
	601	{ }
	602	};
	603
	604	static struct usb_driver iguanair_driver = {
	605	.name = DRIVER_NAME,
	606	.probe = iguanair_probe,
	607	.disconnect = __devexit_p(iguanair_disconnect),
	608	.suspend = iguanair_suspend,
	609	.resume = iguanair_resume,
	610	.reset_resume = iguanair_resume,
7c0bd96b SY	611	.id_table = iguanair_table,
7c0bd96b SY	612	.soft_unbind = 1 /* we want to disable receiver on unbind */
26ff6313 SY	613	};
	614
	615	module_usb_driver(iguanair_driver);
	616
	617	MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
	618	MODULE_AUTHOR("Sean Young <sean@mess.org>");
	619	MODULE_LICENSE("GPL");
	620	MODULE_DEVICE_TABLE(usb, iguanair_table);
	621