[PATCH] USB Storage: add support for Maxtor One-Touch button

This patch is originally from Nick Sillik, and has been rediffed against
the latest tree.

This patch adds usability to the OneTouch Button on Maxtor External USB
Hard Drives. Using an unusual device entry it declares an extra init
function which claims the interrupt endpoint associated with this
button.  The button is connected to the input system.

Signed-off-by: Nick Sillik <n.sillik@temple.edu>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 205 insertions, 0 deletions

diff --git a/drivers/usb/storage/onetouch.c b/drivers/usb/storage/onetouch.c
new file mode 100644
index 0000000000000..07fd29ceb3471
--- /dev/null
+++ b/drivers/usb/storage/onetouch.c
@@ -0,0 +1,205 @@
+/*
+ * Support for the Maxtor OneTouch USB hard drive's button
+ *
+ * Current development and maintenance by:
+ *	Copyright (c) 2005 Nick Sillik <n.sillik@temple.edu>
+ *
+ * Initial work by:
+ * 	Copyright (c) 2003 Erik Thyrén <erth7411@student.uu.se>
+ *
+ * Based on usbmouse.c (Vojtech Pavlik) and xpad.c (Marko Friedemann)
+ *
+ */
+
+/*
+ * 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/config.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include "usb.h"
+#include "onetouch.h"
+#include "debug.h"
+
+void onetouch_release_input(void *onetouch_);
+
+struct usb_onetouch {
+	char name[128];
+	char phys[64];
+	struct input_dev dev;	/* input device interface */
+	struct usb_device *udev;	/* usb device */
+
+	struct urb *irq;	/* urb for interrupt in report */
+	unsigned char *data;	/* input data */
+	dma_addr_t data_dma;
+};
+
+static void usb_onetouch_irq(struct urb *urb, struct pt_regs *regs)
+{
+	struct usb_onetouch *onetouch = urb->context;
+	signed char *data = onetouch->data;
+	struct input_dev *dev = &onetouch->dev;
+	int status;
+
+	switch (urb->status) {
+	case 0:			/* success */
+		break;
+	case -ECONNRESET:	/* unlink */
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+	/* -EPIPE:  should clear the halt */
+	default:		/* error */
+		goto resubmit;
+	}
+
+	input_regs(dev, regs);
+
+	input_report_key(&onetouch->dev, ONETOUCH_BUTTON,
+			 data[0] & 0x02);
+
+	input_sync(dev);
+resubmit:
+	status = usb_submit_urb (urb, SLAB_ATOMIC);
+	if (status)
+		err ("can't resubmit intr, %s-%s/input0, status %d",
+			onetouch->udev->bus->bus_name,
+			onetouch->udev->devpath, status);
+}
+
+static int usb_onetouch_open(struct input_dev *dev)
+{
+	struct usb_onetouch *onetouch = dev->private;
+
+	onetouch->irq->dev = onetouch->udev;
+	if (usb_submit_urb(onetouch->irq, GFP_KERNEL)) {
+		err("usb_submit_urb failed");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void usb_onetouch_close(struct input_dev *dev)
+{
+	struct usb_onetouch *onetouch = dev->private;
+
+	usb_kill_urb(onetouch->irq);
+}
+
+int onetouch_connect_input(struct us_data *ss)
+{
+	struct usb_device *udev = ss->pusb_dev;
+	struct usb_host_interface *interface;
+	struct usb_endpoint_descriptor *endpoint;
+	struct usb_onetouch *onetouch;
+	int pipe, maxp;
+	char path[64];
+
+	interface = ss->pusb_intf->cur_altsetting;
+
+	endpoint = &interface->endpoint[2].desc;
+	if(!(endpoint->bEndpointAddress & 0x80))
+		return -ENODEV;
+	if((endpoint->bmAttributes & 3) != 3)
+		return -ENODEV;
+
+	pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
+	maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
+
+	if (!(onetouch = kcalloc(1, sizeof(struct usb_onetouch), GFP_KERNEL)))
+		return -ENOMEM;
+
+	onetouch->data = usb_buffer_alloc(udev, ONETOUCH_PKT_LEN, SLAB_ATOMIC, &onetouch->data_dma);
+	if (!onetouch->data){
+		kfree(onetouch);
+		return -ENOMEM;
+	}
+
+	onetouch->irq = usb_alloc_urb(0, GFP_KERNEL);
+	if (!onetouch->irq){
+		kfree(onetouch);
+		usb_buffer_free(udev, ONETOUCH_PKT_LEN, onetouch->data, onetouch->data_dma);
+		return -ENODEV;
+	}
+
+
+	onetouch->udev = udev;
+
+	set_bit(EV_KEY, onetouch->dev.evbit);
+	set_bit(ONETOUCH_BUTTON, onetouch->dev.keybit);
+	clear_bit(0, onetouch->dev.keybit);
+
+	onetouch->dev.private = onetouch;
+	onetouch->dev.open = usb_onetouch_open;
+	onetouch->dev.close = usb_onetouch_close;
+
+	usb_make_path(udev, path, 64);
+	sprintf(onetouch->phys, "%s/input0", path);
+
+	onetouch->dev.name = onetouch->name;
+	onetouch->dev.phys = onetouch->phys;
+
+	onetouch->dev.id.bustype = BUS_USB;
+	onetouch->dev.id.vendor = le16_to_cpu(udev->descriptor.idVendor);
+	onetouch->dev.id.product = le16_to_cpu(udev->descriptor.idProduct);
+	onetouch->dev.id.version = le16_to_cpu(udev->descriptor.bcdDevice);
+
+	onetouch->dev.dev = &udev->dev;
+
+	if (udev->manufacturer)
+		strcat(onetouch->name, udev->manufacturer);
+	if (udev->product)
+		sprintf(onetouch->name, "%s %s", onetouch->name,
+			udev->product);
+	if (!strlen(onetouch->name))
+		sprintf(onetouch->name, "Maxtor Onetouch %04x:%04x",
+			onetouch->dev.id.vendor, onetouch->dev.id.product);
+
+	usb_fill_int_urb(onetouch->irq, udev, pipe, onetouch->data,
+			 (maxp > 8 ? 8 : maxp),
+			 usb_onetouch_irq, onetouch, endpoint->bInterval);
+	onetouch->irq->transfer_dma = onetouch->data_dma;
+	onetouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	ss->extra_destructor = onetouch_release_input;
+	ss->extra = onetouch;
+
+	input_register_device(&onetouch->dev);
+	printk(KERN_INFO "usb-input: %s on %s\n", onetouch->dev.name, path);
+
+	return 0;
+}
+
+void onetouch_release_input(void *onetouch_)
+{
+	struct usb_onetouch *onetouch = (struct usb_onetouch *) onetouch_;
+
+	if (onetouch) {
+		usb_kill_urb(onetouch->irq);
+		input_unregister_device(&onetouch->dev);
+		usb_free_urb(onetouch->irq);
+		usb_buffer_free(onetouch->udev, ONETOUCH_PKT_LEN,
+				onetouch->data, onetouch->data_dma);
+		printk(KERN_INFO "Maxtor Onetouch %04x:%04x Deregistered\n",
+			onetouch->dev.id.vendor, onetouch->dev.id.product);
+	}
+}