Message-ID: <20100726232900.GE21225@redhat.com>
Date:	Mon, 26 Jul 2010 19:29:00 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-media@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH 04/15] staging/lirc: add lirc_igorplugusb driver

Signed-off-by: Jarod Wilson <jarod@...hat.com>
---
 drivers/staging/lirc/lirc_igorplugusb.c |  555 +++++++++++++++++++++++++++++++
 1 files changed, 555 insertions(+), 0 deletions(-)
 create mode 100644 drivers/staging/lirc/lirc_igorplugusb.c

diff --git a/drivers/staging/lirc/lirc_igorplugusb.c b/drivers/staging/lirc/lirc_igorplugusb.c
new file mode 100644
index 0000000..bce600e
--- /dev/null
+++ b/drivers/staging/lirc/lirc_igorplugusb.c
@@ -0,0 +1,555 @@
+/*
+ * lirc_igorplugusb - USB remote support for LIRC
+ *
+ * Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware.
+ * See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm
+ *
+ * The device can only record bursts of up to 36 pulses/spaces.
+ * Works fine with RC5. Longer commands lead to device buffer overrun.
+ * (Maybe a better firmware or a microcontroller with more ram can help?)
+ *
+ * Version 0.1  [beta status]
+ *
+ * Copyright (C) 2004 Jan M. Hochstein
+ *	<hochstein@...o.informatik.tu-darmstadt.de>
+ *
+ * This driver was derived from:
+ *   Paul Miller <pmiller9@...rs.sourceforge.net>
+ *      "lirc_atiusb" module
+ *   Vladimir Dergachev <volodya@...spring.com>'s 2002
+ *      "USB ATI Remote support" (input device)
+ *   Adrian Dewhurst <sailor-lk@...lorfrag.net>'s 2002
+ *      "USB StreamZap remote driver" (LIRC)
+ *   Artur Lipowski <alipowski@....net.pl>'s 2002
+ *      "lirc_dev" and "lirc_gpio" LIRC modules
+ */
+
+/*
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/usb.h>
+#include <linux/time.h>
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+
+/* module identification */
+#define DRIVER_VERSION		"0.1"
+#define DRIVER_AUTHOR		\
+	"Jan M. Hochstein <hochstein@...o.informatik.tu-darmstadt.de>"
+#define DRIVER_DESC		"USB remote driver for LIRC"
+#define DRIVER_NAME		"lirc_igorplugusb"
+
+/* debugging support */
+#ifdef CONFIG_USB_DEBUG
+static int debug = 1;
+#else
+static int debug;
+#endif
+
+#define dprintk(fmt, args...)					\
+	do {							\
+		if (debug)					\
+			printk(KERN_DEBUG fmt, ## args);	\
+	} while (0)
+
+/* One mode2 pulse/space has 4 bytes. */
+#define CODE_LENGTH	     sizeof(int)
+
+/* Igor's firmware cannot record bursts longer than 36. */
+#define DEVICE_BUFLEN	   36
+
+/*
+ * Header at the beginning of the device's buffer:
+ *	unsigned char data_length
+ *	unsigned char data_start    (!=0 means ring-buffer overrun)
+ *	unsigned char counter       (incremented by each burst)
+ */
+#define DEVICE_HEADERLEN	3
+
+/* This is for the gap */
+#define ADDITIONAL_LIRC_BYTES   2
+
+/* times to poll per second */
+#define SAMPLE_RATE	     100
+static int sample_rate = SAMPLE_RATE;
+
+
+/**** Igor's USB Request Codes */
+
+#define SET_INFRABUFFER_EMPTY   1
+/**
+ * Params: none
+ * Answer: empty
+ */
+
+#define GET_INFRACODE	   2
+/**
+ * Params:
+ *   wValue: offset to begin reading infra buffer
+ *
+ * Answer: infra data
+ */
+
+#define SET_DATAPORT_DIRECTION  3
+/**
+ * Params:
+ *   wValue: (byte) 1 bit for each data port pin (0=in, 1=out)
+ *
+ * Answer: empty
+ */
+
+#define GET_DATAPORT_DIRECTION  4
+/**
+ * Params: none
+ *
+ * Answer: (byte) 1 bit for each data port pin (0=in, 1=out)
+ */
+
+#define SET_OUT_DATAPORT	5
+/**
+ * Params:
+ *   wValue: byte to write to output data port
+ *
+ * Answer: empty
+ */
+
+#define GET_OUT_DATAPORT	6
+/**
+ * Params: none
+ *
+ * Answer: least significant 3 bits read from output data port
+ */
+
+#define GET_IN_DATAPORT	 7
+/**
+ * Params: none
+ *
+ * Answer: least significant 3 bits read from input data port
+ */
+
+#define READ_EEPROM	     8
+/**
+ * Params:
+ *   wValue: offset to begin reading EEPROM
+ *
+ * Answer: EEPROM bytes
+ */
+
+#define WRITE_EEPROM	    9
+/**
+ * Params:
+ *   wValue: offset to EEPROM byte
+ *   wIndex: byte to write
+ *
+ * Answer: empty
+ */
+
+#define SEND_RS232	      10
+/**
+ * Params:
+ *   wValue: byte to send
+ *
+ * Answer: empty
+ */
+
+#define RECV_RS232	      11
+/**
+ * Params: none
+ *
+ * Answer: byte received
+ */
+
+#define SET_RS232_BAUD	  12
+/**
+ * Params:
+ *   wValue: byte to write to UART bit rate register (UBRR)
+ *
+ * Answer: empty
+ */
+
+#define GET_RS232_BAUD	  13
+/**
+ * Params: none
+ *
+ * Answer: byte read from UART bit rate register (UBRR)
+ */
+
+
+/* data structure for each usb remote */
+struct igorplug {
+
+	/* usb */
+	struct usb_device *usbdev;
+	struct urb *urb_in;
+	int devnum;
+
+	unsigned char *buf_in;
+	unsigned int len_in;
+	int in_space;
+	struct timeval last_time;
+
+	dma_addr_t dma_in;
+
+	/* lirc */
+	struct lirc_driver *d;
+
+	/* handle sending (init strings) */
+	int send_flags;
+	wait_queue_head_t wait_out;
+};
+
+static int unregister_from_lirc(struct igorplug *ir)
+{
+	struct lirc_driver *d = ir->d;
+	int devnum;
+
+	if (!ir->d)
+		return -EINVAL;
+
+	devnum = ir->devnum;
+	dprintk(DRIVER_NAME "[%d]: unregister from lirc called\n", devnum);
+
+	lirc_unregister_driver(d->minor);
+
+	printk(DRIVER_NAME "[%d]: usb remote disconnected\n", devnum);
+
+	kfree(d);
+	ir->d = NULL;
+	kfree(ir);
+	return 0;
+}
+
+static int set_use_inc(void *data)
+{
+	struct igorplug *ir = data;
+
+	if (!ir) {
+		printk(DRIVER_NAME "[?]: set_use_inc called with no context\n");
+		return -EIO;
+	}
+	dprintk(DRIVER_NAME "[%d]: set use inc\n", ir->devnum);
+
+	if (!ir->usbdev)
+		return -ENODEV;
+
+	return 0;
+}
+
+static void set_use_dec(void *data)
+{
+	struct igorplug *ir = data;
+
+	if (!ir) {
+		printk(DRIVER_NAME "[?]: set_use_dec called with no context\n");
+		return;
+	}
+	dprintk(DRIVER_NAME "[%d]: set use dec\n", ir->devnum);
+}
+
+
+/**
+ * Called in user context.
+ * return 0 if data was added to the buffer and
+ * -ENODATA if none was available. This should add some number of bits
+ * evenly divisible by code_length to the buffer
+ */
+static int usb_remote_poll(void *data, struct lirc_buffer *buf)
+{
+	int ret;
+	struct igorplug *ir = (struct igorplug *)data;
+
+	if (!ir->usbdev)  /* Has the device been removed? */
+		return -ENODEV;
+
+	memset(ir->buf_in, 0, ir->len_in);
+
+	ret = usb_control_msg(
+	      ir->usbdev, usb_rcvctrlpipe(ir->usbdev, 0),
+	      GET_INFRACODE, USB_TYPE_VENDOR|USB_DIR_IN,
+	      0/* offset */, /*unused*/0,
+	      ir->buf_in, ir->len_in,
+	      /*timeout*/HZ * USB_CTRL_GET_TIMEOUT);
+	if (ret > 0) {
+		int i = DEVICE_HEADERLEN;
+		int code, timediff;
+		struct timeval now;
+
+		if (ret <= 1)  /* ACK packet has 1 byte --> ignore */
+			return -ENODATA;
+
+		dprintk(DRIVER_NAME ": Got %d bytes. Header: %02x %02x %02x\n",
+			ret, ir->buf_in[0], ir->buf_in[1], ir->buf_in[2]);
+
+		if (ir->buf_in[2] != 0) {
+			printk(DRIVER_NAME "[%d]: Device buffer overrun.\n",
+				ir->devnum);
+			/* start at earliest byte */
+			i = DEVICE_HEADERLEN + ir->buf_in[2];
+			/* where are we now? space, gap or pulse? */
+		}
+
+		do_gettimeofday(&now);
+		timediff = now.tv_sec - ir->last_time.tv_sec;
+		if (timediff + 1 > PULSE_MASK / 1000000)
+			timediff = PULSE_MASK;
+		else {
+			timediff *= 1000000;
+			timediff += now.tv_usec - ir->last_time.tv_usec;
+		}
+		ir->last_time.tv_sec = now.tv_sec;
+		ir->last_time.tv_usec = now.tv_usec;
+
+		/* create leading gap  */
+		code = timediff;
+		lirc_buffer_write(buf, (unsigned char *)&code);
+		ir->in_space = 1;   /* next comes a pulse */
+
+		/* MODE2: pulse/space (PULSE_BIT) in 1us units */
+
+		while (i < ret) {
+			/* 1 Igor-tick = 85.333333 us */
+			code = (unsigned int)ir->buf_in[i] * 85
+				+ (unsigned int)ir->buf_in[i] / 3;
+			if (ir->in_space)
+				code |= PULSE_BIT;
+			lirc_buffer_write(buf, (unsigned char *)&code);
+			/* 1 chunk = CODE_LENGTH bytes */
+			ir->in_space ^= 1;
+			++i;
+		}
+
+		ret = usb_control_msg(
+		      ir->usbdev, usb_rcvctrlpipe(ir->usbdev, 0),
+		      SET_INFRABUFFER_EMPTY, USB_TYPE_VENDOR|USB_DIR_IN,
+		      /*unused*/0, /*unused*/0,
+		      /*dummy*/ir->buf_in, /*dummy*/ir->len_in,
+		      /*timeout*/HZ * USB_CTRL_GET_TIMEOUT);
+		if (ret < 0)
+			printk(DRIVER_NAME "[%d]: SET_INFRABUFFER_EMPTY: "
+			       "error %d\n", ir->devnum, ret);
+		return 0;
+	} else if (ret < 0)
+		printk(DRIVER_NAME "[%d]: GET_INFRACODE: error %d\n",
+			ir->devnum, ret);
+
+	return -ENODATA;
+}
+
+
+
+static int usb_remote_probe(struct usb_interface *intf,
+				const struct usb_device_id *id)
+{
+	struct usb_device *dev = NULL;
+	struct usb_host_interface *idesc = NULL;
+	struct usb_host_endpoint *ep_ctl2;
+	struct igorplug *ir = NULL;
+	struct lirc_driver *driver = NULL;
+	int devnum, pipe, maxp;
+	int minor = 0;
+	char buf[63], name[128] = "";
+	int mem_failure = 0;
+	int ret;
+
+	dprintk(DRIVER_NAME ": usb probe called.\n");
+
+	dev = interface_to_usbdev(intf);
+
+	idesc = intf->cur_altsetting;
+
+	if (idesc->desc.bNumEndpoints != 1)
+		return -ENODEV;
+	ep_ctl2 = idesc->endpoint;
+	if (((ep_ctl2->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+	    != USB_DIR_IN)
+	    || (ep_ctl2->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+	    != USB_ENDPOINT_XFER_CONTROL)
+		return -ENODEV;
+	pipe = usb_rcvctrlpipe(dev, ep_ctl2->desc.bEndpointAddress);
+	devnum = dev->devnum;
+	maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
+
+	dprintk(DRIVER_NAME "[%d]: bytes_in_key=%lu maxp=%d\n",
+		devnum, CODE_LENGTH, maxp);
+
+
+	mem_failure = 0;
+	ir = kzalloc(sizeof(struct igorplug), GFP_KERNEL);
+	if (!ir) {
+		mem_failure = 1;
+		goto mem_failure_switch;
+	}
+	driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
+	if (!driver) {
+		mem_failure = 2;
+		goto mem_failure_switch;
+	}
+
+	ir->buf_in = usb_alloc_coherent(dev,
+			      DEVICE_BUFLEN+DEVICE_HEADERLEN,
+			      GFP_ATOMIC, &ir->dma_in);
+	if (!ir->buf_in) {
+		mem_failure = 3;
+		goto mem_failure_switch;
+	}
+
+	strcpy(driver->name, DRIVER_NAME " ");
+	driver->minor = -1;
+	driver->code_length = CODE_LENGTH * 8; /* in bits */
+	driver->features = LIRC_CAN_REC_MODE2;
+	driver->data = ir;
+	driver->chunk_size = CODE_LENGTH;
+	driver->buffer_size = DEVICE_BUFLEN + ADDITIONAL_LIRC_BYTES;
+	driver->set_use_inc = &set_use_inc;
+	driver->set_use_dec = &set_use_dec;
+	driver->sample_rate = sample_rate;    /* per second */
+	driver->add_to_buf = &usb_remote_poll;
+	driver->dev = &intf->dev;
+	driver->owner = THIS_MODULE;
+
+	init_waitqueue_head(&ir->wait_out);
+
+	minor = lirc_register_driver(driver);
+	if (minor < 0)
+		mem_failure = 9;
+
+mem_failure_switch:
+
+	switch (mem_failure) {
+	case 9:
+		usb_free_coherent(dev, DEVICE_BUFLEN+DEVICE_HEADERLEN,
+			ir->buf_in, ir->dma_in);
+	case 3:
+		kfree(driver);
+	case 2:
+		kfree(ir);
+	case 1:
+		printk(DRIVER_NAME "[%d]: out of memory (code=%d)\n",
+			devnum, mem_failure);
+		return -ENOMEM;
+	}
+
+	driver->minor = minor;
+	ir->d = driver;
+	ir->devnum = devnum;
+	ir->usbdev = dev;
+	ir->len_in = DEVICE_BUFLEN+DEVICE_HEADERLEN;
+	ir->in_space = 1; /* First mode2 event is a space. */
+	do_gettimeofday(&ir->last_time);
+
+	if (dev->descriptor.iManufacturer
+	    && usb_string(dev, dev->descriptor.iManufacturer,
+			  buf, sizeof(buf)) > 0)
+		strlcpy(name, buf, sizeof(name));
+	if (dev->descriptor.iProduct
+	    && usb_string(dev, dev->descriptor.iProduct, buf, sizeof(buf)) > 0)
+		snprintf(name + strlen(name), sizeof(name) - strlen(name),
+			 " %s", buf);
+	printk(DRIVER_NAME "[%d]: %s on usb%d:%d\n", devnum, name,
+	       dev->bus->busnum, devnum);
+
+	/* clear device buffer */
+	ret = usb_control_msg(ir->usbdev, usb_rcvctrlpipe(ir->usbdev, 0),
+		SET_INFRABUFFER_EMPTY, USB_TYPE_VENDOR|USB_DIR_IN,
+		/*unused*/0, /*unused*/0,
+		/*dummy*/ir->buf_in, /*dummy*/ir->len_in,
+		/*timeout*/HZ * USB_CTRL_GET_TIMEOUT);
+	if (ret < 0)
+		printk(DRIVER_NAME "[%d]: SET_INFRABUFFER_EMPTY: error %d\n",
+			devnum, ret);
+
+	usb_set_intfdata(intf, ir);
+	return 0;
+}
+
+
+static void usb_remote_disconnect(struct usb_interface *intf)
+{
+	struct usb_device *dev = interface_to_usbdev(intf);
+	struct igorplug *ir = usb_get_intfdata(intf);
+	usb_set_intfdata(intf, NULL);
+
+	if (!ir || !ir->d)
+		return;
+
+	ir->usbdev = NULL;
+	wake_up_all(&ir->wait_out);
+
+	usb_free_coherent(dev, ir->len_in, ir->buf_in, ir->dma_in);
+
+	unregister_from_lirc(ir);
+}
+
+static struct usb_device_id usb_remote_id_table[] = {
+	/* Igor Plug USB (Atmel's Manufact. ID) */
+	{ USB_DEVICE(0x03eb, 0x0002) },
+
+	/* Terminating entry */
+	{ }
+};
+
+static struct usb_driver usb_remote_driver = {
+	.name =		DRIVER_NAME,
+	.probe =	usb_remote_probe,
+	.disconnect =	usb_remote_disconnect,
+	.id_table =	usb_remote_id_table
+};
+
+static int __init usb_remote_init(void)
+{
+	int i;
+
+	printk(KERN_INFO "\n"
+	       DRIVER_NAME ": " DRIVER_DESC " v" DRIVER_VERSION "\n");
+	printk(DRIVER_NAME ": " DRIVER_AUTHOR "\n");
+	dprintk(DRIVER_NAME ": debug mode enabled\n");
+
+	i = usb_register(&usb_remote_driver);
+	if (i < 0) {
+		printk(DRIVER_NAME ": usb register failed, result = %d\n", i);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void __exit usb_remote_exit(void)
+{
+	usb_deregister(&usb_remote_driver);
+}
+
+module_init(usb_remote_init);
+module_exit(usb_remote_exit);
+
+#include <linux/vermagic.h>
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, usb_remote_id_table);
+
+module_param(sample_rate, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(sample_rate, "Sampling rate in Hz (default: 100)");
+
-- 
1.7.1.1

-- 
Jarod Wilson
jarod@...hat.com

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