redrat3.c 27.5 KB
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/*
 * USB RedRat3 IR Transceiver rc-core driver
 *
 * Copyright (c) 2011 by Jarod Wilson <jarod@redhat.com>
 *  based heavily on the work of Stephen Cox, with additional
 *  help from RedRat Ltd.
 *
 * This driver began life based an an old version of the first-generation
 * lirc_mceusb driver from the lirc 0.7.2 distribution. It was then
 * significantly rewritten by Stephen Cox with the aid of RedRat Ltd's
 * Chris Dodge.
 *
 * The driver was then ported to rc-core and significantly rewritten again,
 * by Jarod, using the in-kernel mceusb driver as a guide, after an initial
 * port effort was started by Stephen.
 *
 * TODO LIST:
 * - fix lirc not showing repeats properly
 * --
 *
 * The RedRat3 is a USB transceiver with both send & receive,
 * with 2 separate sensors available for receive to enable
 * both good long range reception for general use, and good
 * short range reception when required for learning a signal.
 *
 * http://www.redrat.co.uk/
 *
 * It uses its own little protocol to communicate, the required
 * parts of which are embedded within this driver.
 * --
 *
 * 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
 *
 */

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#include <asm/unaligned.h>
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#include <linux/device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <media/rc-core.h>

/* Driver Information */
#define DRIVER_AUTHOR "Jarod Wilson <jarod@redhat.com>"
#define DRIVER_AUTHOR2 "The Dweller, Stephen Cox"
#define DRIVER_DESC "RedRat3 USB IR Transceiver Driver"
#define DRIVER_NAME "redrat3"

/* module parameters */
#ifdef CONFIG_USB_DEBUG
static int debug = 1;
#else
static int debug;
#endif

#define RR3_DEBUG_STANDARD		0x1
#define RR3_DEBUG_FUNCTION_TRACE	0x2

#define rr3_dbg(dev, fmt, ...)					\
	do {							\
		if (debug & RR3_DEBUG_STANDARD)			\
			dev_info(dev, fmt, ## __VA_ARGS__);	\
	} while (0)

#define rr3_ftr(dev, fmt, ...)					\
	do {							\
		if (debug & RR3_DEBUG_FUNCTION_TRACE)		\
			dev_info(dev, fmt, ## __VA_ARGS__);	\
	} while (0)

/* bulk data transfer types */
#define RR3_ERROR		0x01
#define RR3_MOD_SIGNAL_IN	0x20
#define RR3_MOD_SIGNAL_OUT	0x21

/* Get the RR firmware version */
#define RR3_FW_VERSION		0xb1
#define RR3_FW_VERSION_LEN	64
/* Send encoded signal bulk-sent earlier*/
#define RR3_TX_SEND_SIGNAL	0xb3
#define RR3_SET_IR_PARAM	0xb7
#define RR3_GET_IR_PARAM	0xb8
/* Blink the red LED on the device */
#define RR3_BLINK_LED		0xb9
/* Read serial number of device */
#define RR3_READ_SER_NO		0xba
#define RR3_SER_NO_LEN		4
/* Start capture with the RC receiver */
#define RR3_RC_DET_ENABLE	0xbb
/* Stop capture with the RC receiver */
#define RR3_RC_DET_DISABLE	0xbc
/* Return the status of RC detector capture */
#define RR3_RC_DET_STATUS	0xbd
/* Reset redrat */
#define RR3_RESET		0xa0

/* Max number of lengths in the signal. */
#define RR3_IR_IO_MAX_LENGTHS	0x01
/* Periods to measure mod. freq. */
#define RR3_IR_IO_PERIODS_MF	0x02
/* Size of memory for main signal data */
#define RR3_IR_IO_SIG_MEM_SIZE	0x03
/* Delta value when measuring lengths */
#define RR3_IR_IO_LENGTH_FUZZ	0x04
/* Timeout for end of signal detection */
#define RR3_IR_IO_SIG_TIMEOUT	0x05
/* Minumum value for pause recognition. */
#define RR3_IR_IO_MIN_PAUSE	0x06

/* Clock freq. of EZ-USB chip */
#define RR3_CLK			24000000
/* Clock periods per timer count */
#define RR3_CLK_PER_COUNT	12
/* (RR3_CLK / RR3_CLK_PER_COUNT) */
#define RR3_CLK_CONV_FACTOR	2000000
/* USB bulk-in IR data endpoint address */
#define RR3_BULK_IN_EP_ADDR	0x82

/* Size of the fixed-length portion of the signal */
#define RR3_DRIVER_MAXLENS	128
#define RR3_MAX_SIG_SIZE	512
#define RR3_TIME_UNIT		50
#define RR3_END_OF_SIGNAL	0x7f
#define RR3_TX_TRAILER_LEN	2
#define RR3_RX_MIN_TIMEOUT	5
#define RR3_RX_MAX_TIMEOUT	2000

/* The 8051's CPUCS Register address */
#define RR3_CPUCS_REG_ADDR	0x7f92

#define USB_RR3USB_VENDOR_ID	0x112a
#define USB_RR3USB_PRODUCT_ID	0x0001
#define USB_RR3IIUSB_PRODUCT_ID	0x0005

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struct redrat3_header {
	__be16 length;
	__be16 transfer_type;
} __packed;

/* sending and receiving irdata */
struct redrat3_irdata {
	struct redrat3_header header;
	__be32 pause;
	__be16 mod_freq_count;
	__be16 num_periods;
	__u8 max_lengths;
	__u8 no_lengths;
	__be16 max_sig_size;
	__be16 sig_size;
	__u8 no_repeats;
	__be16 lens[RR3_DRIVER_MAXLENS]; /* not aligned */
	__u8 sigdata[RR3_MAX_SIG_SIZE];
} __packed;

/* firmware errors */
struct redrat3_error {
	struct redrat3_header header;
	__be16 fw_error;
} __packed;

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/* table of devices that work with this driver */
static struct usb_device_id redrat3_dev_table[] = {
	/* Original version of the RedRat3 */
	{USB_DEVICE(USB_RR3USB_VENDOR_ID, USB_RR3USB_PRODUCT_ID)},
	/* Second Version/release of the RedRat3 - RetRat3-II */
	{USB_DEVICE(USB_RR3USB_VENDOR_ID, USB_RR3IIUSB_PRODUCT_ID)},
	{}			/* Terminating entry */
};

/* Structure to hold all of our device specific stuff */
struct redrat3_dev {
	/* core device bits */
	struct rc_dev *rc;
	struct device *dev;

	/* save off the usb device pointer */
	struct usb_device *udev;

	/* the receive endpoint */
	struct usb_endpoint_descriptor *ep_in;
	/* the buffer to receive data */
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	void *bulk_in_buf;
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	/* urb used to read ir data */
	struct urb *read_urb;

	/* the send endpoint */
	struct usb_endpoint_descriptor *ep_out;

	/* usb dma */
	dma_addr_t dma_in;

	/* rx signal timeout timer */
	struct timer_list rx_timeout;
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	u32 hw_timeout;
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	/* Is the device currently transmitting?*/
	bool transmitting;

	/* store for current packet */
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	struct redrat3_irdata irdata;
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	u16 bytes_read;

	u32 carrier;

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

/*
 * redrat3_issue_async
 *
 *  Issues an async read to the ir data in port..
 *  sets the callback to be redrat3_handle_async
 */
static void redrat3_issue_async(struct redrat3_dev *rr3)
{
	int res;

	rr3_ftr(rr3->dev, "Entering %s\n", __func__);

	res = usb_submit_urb(rr3->read_urb, GFP_ATOMIC);
	if (res)
		rr3_dbg(rr3->dev, "%s: receive request FAILED! "
			"(res %d, len %d)\n", __func__, res,
			rr3->read_urb->transfer_buffer_length);
}

static void redrat3_dump_fw_error(struct redrat3_dev *rr3, int code)
{
	if (!rr3->transmitting && (code != 0x40))
		dev_info(rr3->dev, "fw error code 0x%02x: ", code);

	switch (code) {
	case 0x00:
		pr_cont("No Error\n");
		break;

	/* Codes 0x20 through 0x2f are IR Firmware Errors */
	case 0x20:
		pr_cont("Initial signal pulse not long enough "
			"to measure carrier frequency\n");
		break;
	case 0x21:
		pr_cont("Not enough length values allocated for signal\n");
		break;
	case 0x22:
		pr_cont("Not enough memory allocated for signal data\n");
		break;
	case 0x23:
		pr_cont("Too many signal repeats\n");
		break;
	case 0x28:
		pr_cont("Insufficient memory available for IR signal "
			"data memory allocation\n");
		break;
	case 0x29:
		pr_cont("Insufficient memory available "
			"for IrDa signal data memory allocation\n");
		break;

	/* Codes 0x30 through 0x3f are USB Firmware Errors */
	case 0x30:
		pr_cont("Insufficient memory available for bulk "
			"transfer structure\n");
		break;

	/*
	 * Other error codes... These are primarily errors that can occur in
	 * the control messages sent to the redrat
	 */
	case 0x40:
		if (!rr3->transmitting)
			pr_cont("Signal capture has been terminated\n");
		break;
	case 0x41:
		pr_cont("Attempt to set/get and unknown signal I/O "
			"algorithm parameter\n");
		break;
	case 0x42:
		pr_cont("Signal capture already started\n");
		break;

	default:
		pr_cont("Unknown Error\n");
		break;
	}
}

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static u32 redrat3_val_to_mod_freq(struct redrat3_irdata *irdata)
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{
	u32 mod_freq = 0;
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	u16 mod_freq_count = be16_to_cpu(irdata->mod_freq_count);
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	if (mod_freq_count != 0)
		mod_freq = (RR3_CLK * be16_to_cpu(irdata->num_periods)) /
			(mod_freq_count * RR3_CLK_PER_COUNT);
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	return mod_freq;
}

/* this function scales down the figures for the same result... */
static u32 redrat3_len_to_us(u32 length)
{
	u32 biglen = length * 1000;
	u32 divisor = (RR3_CLK_CONV_FACTOR) / 1000;
	u32 result = (u32) (biglen / divisor);

	/* don't allow zero lengths to go back, breaks lirc */
	return result ? result : 1;
}

/*
 * convert us back into redrat3 lengths
 *
 * length * 1000   length * 1000000
 * ------------- = ---------------- = micro
 * rr3clk / 1000       rr3clk

 * 6 * 2       4 * 3        micro * rr3clk          micro * rr3clk / 1000
 * ----- = 4   ----- = 6    -------------- = len    ---------------------
 *   3           2             1000000                    1000
 */
static u32 redrat3_us_to_len(u32 microsec)
{
	u32 result;
	u32 divisor;

	microsec &= IR_MAX_DURATION;
	divisor = (RR3_CLK_CONV_FACTOR / 1000);
	result = (u32)(microsec * divisor) / 1000;

	/* don't allow zero lengths to go back, breaks lirc */
	return result ? result : 1;
}

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/* timer callback to send reset event */
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static void redrat3_rx_timeout(unsigned long data)
{
	struct redrat3_dev *rr3 = (struct redrat3_dev *)data;

	rr3_dbg(rr3->dev, "calling ir_raw_event_reset\n");
	ir_raw_event_reset(rr3->rc);
}

static void redrat3_process_ir_data(struct redrat3_dev *rr3)
{
	DEFINE_IR_RAW_EVENT(rawir);
	struct device *dev;
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	unsigned i, trailer = 0;
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	unsigned sig_size, single_len, offset, val;
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	unsigned long delay;
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	u32 mod_freq;
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	if (!rr3) {
		pr_err("%s called with no context!\n", __func__);
		return;
	}

	rr3_ftr(rr3->dev, "Entered %s\n", __func__);

	dev = rr3->dev;

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	/* Make sure we reset the IR kfifo after a bit of inactivity */
	delay = usecs_to_jiffies(rr3->hw_timeout);
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	mod_timer(&rr3->rx_timeout, jiffies + delay);

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	mod_freq = redrat3_val_to_mod_freq(&rr3->irdata);
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	rr3_dbg(dev, "Got mod_freq of %u\n", mod_freq);

	/* process each rr3 encoded byte into an int */
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	sig_size = be16_to_cpu(rr3->irdata.sig_size);
	for (i = 0; i < sig_size; i++) {
		offset = rr3->irdata.sigdata[i];
		val = get_unaligned_be16(&rr3->irdata.lens[offset]);
		single_len = redrat3_len_to_us(val);
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		/* we should always get pulse/space/pulse/space samples */
		if (i % 2)
			rawir.pulse = false;
		else
			rawir.pulse = true;

		rawir.duration = US_TO_NS(single_len);
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		/* Save initial pulse length to fudge trailer */
		if (i == 0)
			trailer = rawir.duration;
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		/* cap the value to IR_MAX_DURATION */
		rawir.duration &= IR_MAX_DURATION;

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		rr3_dbg(dev, "storing %s with duration %d (i: %d)\n",
			rawir.pulse ? "pulse" : "space", rawir.duration, i);
		ir_raw_event_store_with_filter(rr3->rc, &rawir);
	}

	/* add a trailing space, if need be */
	if (i % 2) {
		rawir.pulse = false;
		/* this duration is made up, and may not be ideal... */
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		if (trailer < US_TO_NS(1000))
			rawir.duration = US_TO_NS(2800);
		else
			rawir.duration = trailer;
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		rr3_dbg(dev, "storing trailing space with duration %d\n",
			rawir.duration);
		ir_raw_event_store_with_filter(rr3->rc, &rawir);
	}

	rr3_dbg(dev, "calling ir_raw_event_handle\n");
	ir_raw_event_handle(rr3->rc);
}

/* Util fn to send rr3 cmds */
static u8 redrat3_send_cmd(int cmd, struct redrat3_dev *rr3)
{
	struct usb_device *udev;
	u8 *data;
	int res;

	data = kzalloc(sizeof(u8), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	udev = rr3->udev;
	res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), cmd,
			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			      0x0000, 0x0000, data, sizeof(u8), HZ * 10);

	if (res < 0) {
		dev_err(rr3->dev, "%s: Error sending rr3 cmd res %d, data %d",
			__func__, res, *data);
		res = -EIO;
	} else
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		res = data[0];
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	kfree(data);

	return res;
}

/* Enables the long range detector and starts async receive */
static int redrat3_enable_detector(struct redrat3_dev *rr3)
{
	struct device *dev = rr3->dev;
	u8 ret;

	rr3_ftr(dev, "Entering %s\n", __func__);

	ret = redrat3_send_cmd(RR3_RC_DET_ENABLE, rr3);
	if (ret != 0)
		dev_dbg(dev, "%s: unexpected ret of %d\n",
			__func__, ret);

	ret = redrat3_send_cmd(RR3_RC_DET_STATUS, rr3);
	if (ret != 1) {
		dev_err(dev, "%s: detector status: %d, should be 1\n",
			__func__, ret);
		return -EIO;
	}

	redrat3_issue_async(rr3);

	return 0;
}

static inline void redrat3_delete(struct redrat3_dev *rr3,
				  struct usb_device *udev)
{
	rr3_ftr(rr3->dev, "%s cleaning up\n", __func__);
	usb_kill_urb(rr3->read_urb);

	usb_free_urb(rr3->read_urb);

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	usb_free_coherent(udev, le16_to_cpu(rr3->ep_in->wMaxPacketSize),
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			  rr3->bulk_in_buf, rr3->dma_in);

	kfree(rr3);
}

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static u32 redrat3_get_timeout(struct redrat3_dev *rr3)
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{
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	__be32 *tmp;
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	u32 timeout = MS_TO_US(150); /* a sane default, if things go haywire */
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	int len, ret, pipe;

	len = sizeof(*tmp);
	tmp = kzalloc(len, GFP_KERNEL);
	if (!tmp) {
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		dev_warn(rr3->dev, "Memory allocation faillure\n");
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		return timeout;
	}

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	pipe = usb_rcvctrlpipe(rr3->udev, 0);
	ret = usb_control_msg(rr3->udev, pipe, RR3_GET_IR_PARAM,
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			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			      RR3_IR_IO_SIG_TIMEOUT, 0, tmp, len, HZ * 5);
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	if (ret != len)
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		dev_warn(rr3->dev, "Failed to read timeout from hardware\n");
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	else {
		timeout = redrat3_len_to_us(be32_to_cpup(tmp));

		rr3_dbg(rr3->dev, "Got timeout of %d ms\n", timeout / 1000);
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	}

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	kfree(tmp);
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	return timeout;
}

static void redrat3_reset(struct redrat3_dev *rr3)
{
	struct usb_device *udev = rr3->udev;
	struct device *dev = rr3->dev;
	int rc, rxpipe, txpipe;
	u8 *val;
	int len = sizeof(u8);

	rr3_ftr(dev, "Entering %s\n", __func__);

	rxpipe = usb_rcvctrlpipe(udev, 0);
	txpipe = usb_sndctrlpipe(udev, 0);

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	val = kmalloc(len, GFP_KERNEL);
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	if (!val) {
		dev_err(dev, "Memory allocation failure\n");
		return;
	}

	*val = 0x01;
	rc = usb_control_msg(udev, rxpipe, RR3_RESET,
			     USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			     RR3_CPUCS_REG_ADDR, 0, val, len, HZ * 25);
	rr3_dbg(dev, "reset returned 0x%02x\n", rc);

	*val = 5;
	rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
			     USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
			     RR3_IR_IO_LENGTH_FUZZ, 0, val, len, HZ * 25);
	rr3_dbg(dev, "set ir parm len fuzz %d rc 0x%02x\n", *val, rc);

	*val = RR3_DRIVER_MAXLENS;
	rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
			     USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
			     RR3_IR_IO_MAX_LENGTHS, 0, val, len, HZ * 25);
	rr3_dbg(dev, "set ir parm max lens %d rc 0x%02x\n", *val, rc);

	kfree(val);
}

static void redrat3_get_firmware_rev(struct redrat3_dev *rr3)
{
	int rc = 0;
	char *buffer;

	rr3_ftr(rr3->dev, "Entering %s\n", __func__);

	buffer = kzalloc(sizeof(char) * (RR3_FW_VERSION_LEN + 1), GFP_KERNEL);
	if (!buffer) {
		dev_err(rr3->dev, "Memory allocation failure\n");
		return;
	}

	rc = usb_control_msg(rr3->udev, usb_rcvctrlpipe(rr3->udev, 0),
			     RR3_FW_VERSION,
			     USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			     0, 0, buffer, RR3_FW_VERSION_LEN, HZ * 5);

	if (rc >= 0)
		dev_info(rr3->dev, "Firmware rev: %s", buffer);
	else
		dev_err(rr3->dev, "Problem fetching firmware ID\n");

	kfree(buffer);
	rr3_ftr(rr3->dev, "Exiting %s\n", __func__);
}

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static void redrat3_read_packet_start(struct redrat3_dev *rr3, unsigned len)
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{
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	struct redrat3_header *header = rr3->bulk_in_buf;
	unsigned pktlen, pkttype;
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	rr3_ftr(rr3->dev, "Entering %s\n", __func__);

	/* grab the Length and type of transfer */
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	pktlen = be16_to_cpu(header->length);
	pkttype = be16_to_cpu(header->transfer_type);
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	if (pktlen > sizeof(rr3->irdata)) {
		dev_warn(rr3->dev, "packet length %u too large\n", pktlen);
		return;
	}
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	switch (pkttype) {
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	case RR3_ERROR:
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		if (len >= sizeof(struct redrat3_error)) {
			struct redrat3_error *error = rr3->bulk_in_buf;
			unsigned fw_error = be16_to_cpu(error->fw_error);
			redrat3_dump_fw_error(rr3, fw_error);
		}
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		break;

	case RR3_MOD_SIGNAL_IN:
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		memcpy(&rr3->irdata, rr3->bulk_in_buf, len);
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		rr3->bytes_read = len;
		rr3_dbg(rr3->dev, "bytes_read %d, pktlen %d\n",
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			rr3->bytes_read, pktlen);
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		break;

	default:
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		rr3_dbg(rr3->dev, "ignoring packet with type 0x%02x, len of %d, 0x%02x\n",
						pkttype, len, pktlen);
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		break;
	}
}

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static void redrat3_read_packet_continue(struct redrat3_dev *rr3, unsigned len)
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{
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	void *irdata = &rr3->irdata;

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	rr3_ftr(rr3->dev, "Entering %s\n", __func__);

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	if (len + rr3->bytes_read > sizeof(rr3->irdata)) {
		dev_warn(rr3->dev, "too much data for packet\n");
		rr3->bytes_read = 0;
		return;
	}

	memcpy(irdata + rr3->bytes_read, rr3->bulk_in_buf, len);
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	rr3->bytes_read += len;
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	rr3_dbg(rr3->dev, "bytes_read %d, pktlen %d\n", rr3->bytes_read,
				 be16_to_cpu(rr3->irdata.header.length));
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}

/* gather IR data from incoming urb, process it when we have enough */
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static int redrat3_get_ir_data(struct redrat3_dev *rr3, unsigned len)
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{
	struct device *dev = rr3->dev;
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	unsigned pkttype;
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	int ret = 0;

	rr3_ftr(dev, "Entering %s\n", __func__);

656
	if (rr3->bytes_read == 0 && len >= sizeof(struct redrat3_header)) {
657 658 659 660 661 662 663 664 665
		redrat3_read_packet_start(rr3, len);
	} else if (rr3->bytes_read != 0) {
		redrat3_read_packet_continue(rr3, len);
	} else if (rr3->bytes_read == 0) {
		dev_err(dev, "error: no packet data read\n");
		ret = -ENODATA;
		goto out;
	}

666
	if (rr3->bytes_read < be16_to_cpu(rr3->irdata.header.length))
667 668 669 670
		/* we're still accumulating data */
		return 0;

	/* if we get here, we've got IR data to decode */
671 672
	pkttype = be16_to_cpu(rr3->irdata.header.transfer_type);
	if (pkttype == RR3_MOD_SIGNAL_IN)
673 674
		redrat3_process_ir_data(rr3);
	else
675 676
		rr3_dbg(dev, "discarding non-signal data packet (type 0x%02x)\n",
								pkttype);
677 678 679 680 681 682 683

out:
	rr3->bytes_read = 0;
	return ret;
}

/* callback function from USB when async USB request has completed */
684
static void redrat3_handle_async(struct urb *urb)
685 686
{
	struct redrat3_dev *rr3;
687
	int ret;
688 689 690 691 692 693 694 695 696 697 698 699 700 701 702

	if (!urb)
		return;

	rr3 = urb->context;
	if (!rr3) {
		pr_err("%s called with invalid context!\n", __func__);
		usb_unlink_urb(urb);
		return;
	}

	rr3_ftr(rr3->dev, "Entering %s\n", __func__);

	switch (urb->status) {
	case 0:
703 704 705 706 707
		ret = redrat3_get_ir_data(rr3, urb->actual_length);
		if (!ret) {
			/* no error, prepare to read more */
			redrat3_issue_async(rr3);
		}
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
		break;

	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		usb_unlink_urb(urb);
		return;

	case -EPIPE:
	default:
		dev_warn(rr3->dev, "Error: urb status = %d\n", urb->status);
		rr3->bytes_read = 0;
		break;
	}
}

static u16 mod_freq_to_val(unsigned int mod_freq)
{
	int mult = 6000000;

	/* Clk used in mod. freq. generation is CLK24/4. */
729
	return 65536 - (mult / mod_freq);
730 731
}

732
static int redrat3_set_tx_carrier(struct rc_dev *rcdev, u32 carrier)
733
{
734 735
	struct redrat3_dev *rr3 = rcdev->priv;
	struct device *dev = rr3->dev;
736

737
	rr3_dbg(dev, "Setting modulation frequency to %u", carrier);
738 739 740
	if (carrier == 0)
		return -EINVAL;

741 742 743 744 745
	rr3->carrier = carrier;

	return carrier;
}

746 747
static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
				unsigned count)
748 749 750
{
	struct redrat3_dev *rr3 = rcdev->priv;
	struct device *dev = rr3->dev;
751
	struct redrat3_irdata *irdata = NULL;
752
	int ret, ret_len;
753 754 755
	int lencheck, cur_sample_len, pipe;
	int *sample_lens = NULL;
	u8 curlencheck = 0;
756
	unsigned i, sendbuf_len;
757 758 759 760 761 762 763 764

	rr3_ftr(dev, "Entering %s\n", __func__);

	if (rr3->transmitting) {
		dev_warn(dev, "%s: transmitter already in use\n", __func__);
		return -EAGAIN;
	}

765
	count = min_t(unsigned, count, RR3_MAX_SIG_SIZE - RR3_TX_TRAILER_LEN);
766

767
	/* rr3 will disable rc detector on transmit */
768 769 770 771 772 773 774 775
	rr3->transmitting = true;

	sample_lens = kzalloc(sizeof(int) * RR3_DRIVER_MAXLENS, GFP_KERNEL);
	if (!sample_lens) {
		ret = -ENOMEM;
		goto out;
	}

776 777
	irdata = kzalloc(sizeof(*irdata), GFP_KERNEL);
	if (!irdata) {
778 779 780 781
		ret = -ENOMEM;
		goto out;
	}

782
	for (i = 0; i < count; i++) {
783
		cur_sample_len = redrat3_us_to_len(txbuf[i]);
784 785 786 787 788
		if (cur_sample_len > 0xffff) {
			dev_warn(dev, "transmit period of %uus truncated to %uus\n",
					txbuf[i], redrat3_len_to_us(0xffff));
			cur_sample_len = 0xffff;
		}
789 790 791 792 793 794 795
		for (lencheck = 0; lencheck < curlencheck; lencheck++) {
			if (sample_lens[lencheck] == cur_sample_len)
				break;
		}
		if (lencheck == curlencheck) {
			rr3_dbg(dev, "txbuf[%d]=%u, pos %d, enc %u\n",
				i, txbuf[i], curlencheck, cur_sample_len);
796
			if (curlencheck < RR3_DRIVER_MAXLENS) {
797 798 799
				/* now convert the value to a proper
				 * rr3 value.. */
				sample_lens[curlencheck] = cur_sample_len;
800 801
				put_unaligned_be16(cur_sample_len,
						&irdata->lens[curlencheck]);
802 803
				curlencheck++;
			} else {
804 805
				count = i - 1;
				break;
806 807
			}
		}
808
		irdata->sigdata[i] = lencheck;
809 810
	}

811 812
	irdata->sigdata[count] = RR3_END_OF_SIGNAL;
	irdata->sigdata[count + 1] = RR3_END_OF_SIGNAL;
813

814 815
	sendbuf_len = offsetof(struct redrat3_irdata,
					sigdata[count + RR3_TX_TRAILER_LEN]);
816
	/* fill in our packet header */
817 818 819 820 821 822 823
	irdata->header.length = cpu_to_be16(sendbuf_len -
						sizeof(struct redrat3_header));
	irdata->header.transfer_type = cpu_to_be16(RR3_MOD_SIGNAL_OUT);
	irdata->pause = cpu_to_be32(redrat3_len_to_us(100));
	irdata->mod_freq_count = cpu_to_be16(mod_freq_to_val(rr3->carrier));
	irdata->no_lengths = curlencheck;
	irdata->sig_size = cpu_to_be16(count + RR3_TX_TRAILER_LEN);
824 825

	pipe = usb_sndbulkpipe(rr3->udev, rr3->ep_out->bEndpointAddress);
826
	ret = usb_bulk_msg(rr3->udev, pipe, irdata,
827
			    sendbuf_len, &ret_len, 10 * HZ);
828
	rr3_dbg(dev, "sent %d bytes, (ret %d)\n", ret_len, ret);
829 830 831 832 833

	/* now tell the hardware to transmit what we sent it */
	pipe = usb_rcvctrlpipe(rr3->udev, 0);
	ret = usb_control_msg(rr3->udev, pipe, RR3_TX_SEND_SIGNAL,
			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
834
			      0, 0, irdata, 2, HZ * 10);
835 836 837 838

	if (ret < 0)
		dev_err(dev, "Error: control msg send failed, rc %d\n", ret);
	else
839
		ret = count;
840 841 842

out:
	kfree(sample_lens);
843
	kfree(irdata);
844 845

	rr3->transmitting = false;
846
	/* rr3 re-enables rc detector because it was enabled before */
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876

	return ret;
}

static struct rc_dev *redrat3_init_rc_dev(struct redrat3_dev *rr3)
{
	struct device *dev = rr3->dev;
	struct rc_dev *rc;
	int ret = -ENODEV;
	u16 prod = le16_to_cpu(rr3->udev->descriptor.idProduct);

	rc = rc_allocate_device();
	if (!rc) {
		dev_err(dev, "remote input dev allocation failed\n");
		goto out;
	}

	snprintf(rr3->name, sizeof(rr3->name), "RedRat3%s "
		 "Infrared Remote Transceiver (%04x:%04x)",
		 prod == USB_RR3IIUSB_PRODUCT_ID ? "-II" : "",
		 le16_to_cpu(rr3->udev->descriptor.idVendor), prod);

	usb_make_path(rr3->udev, rr3->phys, sizeof(rr3->phys));

	rc->input_name = rr3->name;
	rc->input_phys = rr3->phys;
	usb_to_input_id(rr3->udev, &rc->input_id);
	rc->dev.parent = dev;
	rc->priv = rr3;
	rc->driver_type = RC_DRIVER_IR_RAW;
877
	rc->allowed_protos = RC_BIT_ALL;
878
	rc->timeout = US_TO_NS(2750);
879 880 881
	rc->tx_ir = redrat3_transmit_ir;
	rc->s_tx_carrier = redrat3_set_tx_carrier;
	rc->driver_name = DRIVER_NAME;
882
	rc->rx_resolution = US_TO_NS(2);
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
	rc->map_name = RC_MAP_HAUPPAUGE;

	ret = rc_register_device(rc);
	if (ret < 0) {
		dev_err(dev, "remote dev registration failed\n");
		goto out;
	}

	return rc;

out:
	rc_free_device(rc);
	return NULL;
}

898 899
static int redrat3_dev_probe(struct usb_interface *intf,
			     const struct usb_device_id *id)
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct device *dev = &intf->dev;
	struct usb_host_interface *uhi;
	struct redrat3_dev *rr3;
	struct usb_endpoint_descriptor *ep;
	struct usb_endpoint_descriptor *ep_in = NULL;
	struct usb_endpoint_descriptor *ep_out = NULL;
	u8 addr, attrs;
	int pipe, i;
	int retval = -ENOMEM;

	rr3_ftr(dev, "%s called\n", __func__);

	uhi = intf->cur_altsetting;

	/* find our bulk-in and bulk-out endpoints */
	for (i = 0; i < uhi->desc.bNumEndpoints; ++i) {
		ep = &uhi->endpoint[i].desc;
		addr = ep->bEndpointAddress;
		attrs = ep->bmAttributes;

		if ((ep_in == NULL) &&
		    ((addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) &&
		    ((attrs & USB_ENDPOINT_XFERTYPE_MASK) ==
		     USB_ENDPOINT_XFER_BULK)) {
			rr3_dbg(dev, "found bulk-in endpoint at 0x%02x\n",
				ep->bEndpointAddress);
			/* data comes in on 0x82, 0x81 is for other data... */
			if (ep->bEndpointAddress == RR3_BULK_IN_EP_ADDR)
				ep_in = ep;
		}

		if ((ep_out == NULL) &&
		    ((addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) &&
		    ((attrs & USB_ENDPOINT_XFERTYPE_MASK) ==
		     USB_ENDPOINT_XFER_BULK)) {
			rr3_dbg(dev, "found bulk-out endpoint at 0x%02x\n",
				ep->bEndpointAddress);
			ep_out = ep;
		}
	}

	if (!ep_in || !ep_out) {
		dev_err(dev, "Couldn't find both in and out endpoints\n");
		retval = -ENODEV;
		goto no_endpoints;
	}

	/* allocate memory for our device state and initialize it */
	rr3 = kzalloc(sizeof(*rr3), GFP_KERNEL);
	if (rr3 == NULL) {
		dev_err(dev, "Memory allocation failure\n");
953
		goto no_endpoints;
954 955 956 957 958 959 960 961 962 963 964 965
	}

	rr3->dev = &intf->dev;

	/* set up bulk-in endpoint */
	rr3->read_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!rr3->read_urb) {
		dev_err(dev, "Read urb allocation failure\n");
		goto error;
	}

	rr3->ep_in = ep_in;
966 967
	rr3->bulk_in_buf = usb_alloc_coherent(udev,
		le16_to_cpu(ep_in->wMaxPacketSize), GFP_ATOMIC, &rr3->dma_in);
968 969 970 971 972 973
	if (!rr3->bulk_in_buf) {
		dev_err(dev, "Read buffer allocation failure\n");
		goto error;
	}

	pipe = usb_rcvbulkpipe(udev, ep_in->bEndpointAddress);
974 975
	usb_fill_bulk_urb(rr3->read_urb, udev, pipe, rr3->bulk_in_buf,
		le16_to_cpu(ep_in->wMaxPacketSize), redrat3_handle_async, rr3);
976 977 978 979 980 981 982 983 984 985 986 987

	rr3->ep_out = ep_out;
	rr3->udev = udev;

	redrat3_reset(rr3);
	redrat3_get_firmware_rev(rr3);

	/* might be all we need to do? */
	retval = redrat3_enable_detector(rr3);
	if (retval < 0)
		goto error;

988 989 990
	/* store current hardware timeout, in us, will use for kfifo resets */
	rr3->hw_timeout = redrat3_get_timeout(rr3);

991 992 993 994
	/* default.. will get overridden by any sends with a freq defined */
	rr3->carrier = 38000;

	rr3->rc = redrat3_init_rc_dev(rr3);
995 996
	if (!rr3->rc) {
		retval = -ENOMEM;
997
		goto error;
998
	}
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
	setup_timer(&rr3->rx_timeout, redrat3_rx_timeout, (unsigned long)rr3);

	/* we can register the device now, as it is ready */
	usb_set_intfdata(intf, rr3);

	rr3_ftr(dev, "Exiting %s\n", __func__);
	return 0;

error:
	redrat3_delete(rr3, rr3->udev);

no_endpoints:
	dev_err(dev, "%s: retval = %x", __func__, retval);

	return retval;
}

1016
static void redrat3_dev_disconnect(struct usb_interface *intf)
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct redrat3_dev *rr3 = usb_get_intfdata(intf);

	rr3_ftr(&intf->dev, "Entering %s\n", __func__);

	if (!rr3)
		return;

	usb_set_intfdata(intf, NULL);
	rc_unregister_device(rr3->rc);
1028
	del_timer_sync(&rr3->rx_timeout);
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	redrat3_delete(rr3, udev);

	rr3_ftr(&intf->dev, "RedRat3 IR Transceiver now disconnected\n");
}

static int redrat3_dev_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct redrat3_dev *rr3 = usb_get_intfdata(intf);
	rr3_ftr(rr3->dev, "suspend\n");
	usb_kill_urb(rr3->read_urb);
	return 0;
}

static int redrat3_dev_resume(struct usb_interface *intf)
{
	struct redrat3_dev *rr3 = usb_get_intfdata(intf);
	rr3_ftr(rr3->dev, "resume\n");
	if (usb_submit_urb(rr3->read_urb, GFP_ATOMIC))
		return -EIO;
	return 0;
}

static struct usb_driver redrat3_dev_driver = {
	.name		= DRIVER_NAME,
	.probe		= redrat3_dev_probe,
1054
	.disconnect	= redrat3_dev_disconnect,
1055 1056 1057 1058 1059 1060
	.suspend	= redrat3_dev_suspend,
	.resume		= redrat3_dev_resume,
	.reset_resume	= redrat3_dev_resume,
	.id_table	= redrat3_dev_table
};

1061
module_usb_driver(redrat3_dev_driver);
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_AUTHOR(DRIVER_AUTHOR2);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, redrat3_dev_table);

module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable module debug spew. 0 = no debugging (default) "
		 "0x1 = standard debug messages, 0x2 = function tracing debug. "
		 "Flag bits are addative (i.e., 0x3 for both debug types).");