[deliverable/linux.git] / drivers / w1 / dscore.c

/*
 *	dscore.c
 *
 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 *
 *
 * 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/mod_devicetable.h>
#include <linux/usb.h>

#include "dscore.h"

static struct usb_device_id ds_id_table [] = {
	{ USB_DEVICE(0x04fa, 0x2490) },
	{ },
};
MODULE_DEVICE_TABLE(usb, ds_id_table);

static int ds_probe(struct usb_interface *, const struct usb_device_id *);
static void ds_disconnect(struct usb_interface *);

int ds_touch_bit(struct ds_device *, u8, u8 *);
int ds_read_byte(struct ds_device *, u8 *);
int ds_read_bit(struct ds_device *, u8 *);
int ds_write_byte(struct ds_device *, u8);
int ds_write_bit(struct ds_device *, u8);
static int ds_start_pulse(struct ds_device *, int);
int ds_reset(struct ds_device *, struct ds_status *);
struct ds_device * ds_get_device(void);
void ds_put_device(struct ds_device *);

static inline void ds_dump_status(unsigned char *, unsigned char *, int);
static int ds_send_control(struct ds_device *, u16, u16);
static int ds_send_control_mode(struct ds_device *, u16, u16);
static int ds_send_control_cmd(struct ds_device *, u16, u16);


static struct usb_driver ds_driver = {
	.owner =	THIS_MODULE,
	.name =		"DS9490R",
	.probe =	ds_probe,
	.disconnect =	ds_disconnect,
	.id_table =	ds_id_table,
};

static struct ds_device *ds_dev;

struct ds_device * ds_get_device(void)
{
	if (ds_dev)
		atomic_inc(&ds_dev->refcnt);
	return ds_dev;
}

void ds_put_device(struct ds_device *dev)
{
	atomic_dec(&dev->refcnt);
}

static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
{
	int err;

	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
			CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
				value, index, err);
		return err;
	}

	return err;
}

static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
{
	int err;

	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
			MODE_CMD, 0x40, value, index, NULL, 0, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
				value, index, err);
		return err;
	}

	return err;
}

static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
{
	int err;

	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
			COMM_CMD, 0x40, value, index, NULL, 0, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
				value, index, err);
		return err;
	}

	return err;
}

static inline void ds_dump_status(unsigned char *buf, unsigned char *str, int off)
{
	printk("%45s: %8x\n", str, buf[off]);
}

static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
				 unsigned char *buf, int size)
{
	int count, err;

	memset(st, 0, sizeof(st));

	count = 0;
	err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
	if (err < 0) {
		printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
		return err;
	}

	if (count >= sizeof(*st))
		memcpy(st, buf, sizeof(*st));

	return count;
}

static int ds_recv_status(struct ds_device *dev, struct ds_status *st)
{
	unsigned char buf[64];
	int count, err = 0, i;

	memcpy(st, buf, sizeof(*st));

	count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
	if (count < 0)
		return err;

	printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
	for (i=0; i<count; ++i)
		printk("%02x ", buf[i]);
	printk("\n");

	if (count >= 16) {
		ds_dump_status(buf, "enable flag", 0);
		ds_dump_status(buf, "1-wire speed", 1);
		ds_dump_status(buf, "strong pullup duration", 2);
		ds_dump_status(buf, "programming pulse duration", 3);
		ds_dump_status(buf, "pulldown slew rate control", 4);
		ds_dump_status(buf, "write-1 low time", 5);
		ds_dump_status(buf, "data sample offset/write-0 recovery time", 6);
		ds_dump_status(buf, "reserved (test register)", 7);
		ds_dump_status(buf, "device status flags", 8);
		ds_dump_status(buf, "communication command byte 1", 9);
		ds_dump_status(buf, "communication command byte 2", 10);
		ds_dump_status(buf, "communication command buffer status", 11);
		ds_dump_status(buf, "1-wire data output buffer status", 12);
		ds_dump_status(buf, "1-wire data input buffer status", 13);
		ds_dump_status(buf, "reserved", 14);
		ds_dump_status(buf, "reserved", 15);
	}

	memcpy(st, buf, sizeof(*st));

	if (st->status & ST_EPOF) {
		printk(KERN_INFO "Resetting device after ST_EPOF.\n");
		err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
		if (err)
			return err;
		count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
		if (count < 0)
			return err;
	}
#if 0
	if (st->status & ST_IDLE) {
		printk(KERN_INFO "Resetting pulse after ST_IDLE.\n");
		err = ds_start_pulse(dev, PULLUP_PULSE_DURATION);
		if (err)
			return err;
	}
#endif

	return err;
}

static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
{
	int count, err;
	struct ds_status st;

	count = 0;
	err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
				buf, size, &count, 1000);
	if (err < 0) {
		printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
		usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
		ds_recv_status(dev, &st);
		return err;
	}

#if 0
	{
		int i;

		printk("%s: count=%d: ", __func__, count);
		for (i=0; i<count; ++i)
			printk("%02x ", buf[i]);
		printk("\n");
	}
#endif
	return count;
}

static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
{
	int count, err;

	count = 0;
	err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to read 1-wire data from 0x02: err=%d.\n", err);
		return err;
	}

	return err;
}

#if 0

int ds_stop_pulse(struct ds_device *dev, int limit)
{
	struct ds_status st;
	int count = 0, err = 0;
	u8 buf[0x20];

	do {
		err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
		if (err)
			break;
		err = ds_send_control(dev, CTL_RESUME_EXE, 0);
		if (err)
			break;
		err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
		if (err)
			break;

		if ((st.status & ST_SPUA) == 0) {
			err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
			if (err)
				break;
		}
	} while(++count < limit);

	return err;
}

int ds_detect(struct ds_device *dev, struct ds_status *st)
{
	int err;

	err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
	if (err)
		return err;

	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
	if (err)
		return err;

	err = ds_recv_status(dev, st);

	return err;
}

#endif  /*  0  */

static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
{
	u8 buf[0x20];
	int err, count = 0;

	do {
		err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
#if 0
		if (err >= 0) {
			int i;
			printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
			for (i=0; i<err; ++i)
				printk("%02x ", buf[i]);
			printk("\n");
		}
#endif
	} while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100);


	if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) {
		ds_recv_status(dev, st);
		return -1;
	} else
		return 0;
}

int ds_reset(struct ds_device *dev, struct ds_status *st)
{
	int err;

	//err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_F | COMM_IM | COMM_SE, SPEED_FLEXIBLE);
	err = ds_send_control(dev, 0x43, SPEED_NORMAL);
	if (err)
		return err;

	ds_wait_status(dev, st);
#if 0
	if (st->command_buffer_status) {
		printk(KERN_INFO "Short circuit.\n");
		return -EIO;
	}
#endif
	
	return 0;
}

#if 0
int ds_set_speed(struct ds_device *dev, int speed)
{
	int err;
	
	if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
		return -EINVAL;

	if (speed != SPEED_OVERDRIVE)
		speed = SPEED_FLEXIBLE;

	speed &= 0xff;

	err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
	if (err)
		return err;

	return err;
}
#endif  /*  0  */

static int ds_start_pulse(struct ds_device *dev, int delay)
{
	int err;
	u8 del = 1 + (u8)(delay >> 4);
	struct ds_status st;

#if 0
	err = ds_stop_pulse(dev, 10);
	if (err)
		return err;

	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
	if (err)
		return err;
#endif
	err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_PULSE | COMM_IM | COMM_F, 0);
	if (err)
		return err;

	mdelay(delay);

	ds_wait_status(dev, &st);

	return err;
}

int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
{
	int err, count;
	struct ds_status st;
	u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0);
	u16 cmd;

	err = ds_send_control(dev, value, 0);
	if (err)
		return err;

	count = 0;
	do {
		err = ds_wait_status(dev, &st);
		if (err)
			return err;

		cmd = st.command0 | (st.command1 << 8);
	} while (cmd != value && ++count < 10);

	if (err < 0 || count >= 10) {
		printk(KERN_ERR "Failed to obtain status.\n");
		return -EINVAL;
	}

	err = ds_recv_data(dev, tbit, sizeof(*tbit));
	if (err < 0)
		return err;

	return 0;
}

int ds_write_bit(struct ds_device *dev, u8 bit)
{
	int err;
	struct ds_status st;

	err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit) ? COMM_D : 0, 0);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

int ds_write_byte(struct ds_device *dev, u8 byte)
{
	int err;
	struct ds_status st;
	u8 rbyte;

	err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte);
	if (err)
		return err;

	err = ds_wait_status(dev, &st);
	if (err)
		return err;

	err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
	if (err < 0)
		return err;

	ds_start_pulse(dev, PULLUP_PULSE_DURATION);

	return !(byte == rbyte);
}

int ds_read_bit(struct ds_device *dev, u8 *bit)
{
	int err;

	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_SPU | COMM_D, 0);
	if (err)
		return err;

	err = ds_recv_data(dev, bit, sizeof(*bit));
	if (err < 0)
		return err;

	return 0;
}

int ds_read_byte(struct ds_device *dev, u8 *byte)
{
	int err;
	struct ds_status st;

	err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_recv_data(dev, byte, sizeof(*byte));
	if (err < 0)
		return err;

	return 0;
}

int ds_read_block(struct ds_device *dev, u8 *buf, int len)
{
	struct ds_status st;
	int err;

	if (len > 64*1024)
		return -E2BIG;

	memset(buf, 0xFF, len);

	err = ds_send_data(dev, buf, len);
	if (err < 0)
		return err;

	err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	memset(buf, 0x00, len);
	err = ds_recv_data(dev, buf, len);

	return err;
}

int ds_write_block(struct ds_device *dev, u8 *buf, int len)
{
	int err;
	struct ds_status st;

	err = ds_send_data(dev, buf, len);
	if (err < 0)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_recv_data(dev, buf, len);
	if (err < 0)
		return err;

	ds_start_pulse(dev, PULLUP_PULSE_DURATION);

	return !(err == len);
}

#if 0

int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
{
	int err;
	u16 value, index;
	struct ds_status st;

	memset(buf, 0, sizeof(buf));

	err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
	if (err)
		return err;

	ds_wait_status(ds_dev, &st);

	value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
	index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
	err = ds_send_control(ds_dev, value, index);
	if (err)
		return err;

	ds_wait_status(ds_dev, &st);

	err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
	if (err < 0)
		return err;

	return err/8;
}

int ds_match_access(struct ds_device *dev, u64 init)
{
	int err;
	struct ds_status st;

	err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

int ds_set_path(struct ds_device *dev, u64 init)
{
	int err;
	struct ds_status st;
	u8 buf[9];

	memcpy(buf, &init, 8);
	buf[8] = BRANCH_MAIN;

	err = ds_send_data(dev, buf, sizeof(buf));
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

#endif  /*  0  */

static int ds_probe(struct usb_interface *intf,
		    const struct usb_device_id *udev_id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *endpoint;
	struct usb_host_interface *iface_desc;
	int i, err;

	ds_dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
	if (!ds_dev) {
		printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
		return -ENOMEM;
	}

	ds_dev->udev = usb_get_dev(udev);
	usb_set_intfdata(intf, ds_dev);

	err = usb_set_interface(ds_dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
	if (err) {
		printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
				intf->altsetting[0].desc.bInterfaceNumber, err);
		return err;
	}

	err = usb_reset_configuration(ds_dev->udev);
	if (err) {
		printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
		return err;
	}

	iface_desc = &intf->altsetting[0];
	if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
		printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
		return -ENODEV;
	}

	atomic_set(&ds_dev->refcnt, 0);
	memset(ds_dev->ep, 0, sizeof(ds_dev->ep));

	/*
	 * This loop doesn'd show control 0 endpoint,
	 * so we will fill only 1-3 endpoints entry.
	 */
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;

		ds_dev->ep[i+1] = endpoint->bEndpointAddress;

		printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
			i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
			(endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
			endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
	}

#if 0
	{
		int err, i;
		u64 buf[3];
		u64 init=0xb30000002078ee81ull;
		struct ds_status st;

		ds_reset(ds_dev, &st);
		err = ds_search(ds_dev, init, buf, 3, 0);
		if (err < 0)
			return err;
		for (i=0; i<err; ++i)
			printk("%d: %llx\n", i, buf[i]);

		printk("Resetting...\n");
		ds_reset(ds_dev, &st);
		printk("Setting path for %llx.\n", init);
		err = ds_set_path(ds_dev, init);
		if (err)
			return err;
		printk("Calling MATCH_ACCESS.\n");
		err = ds_match_access(ds_dev, init);
		if (err)
			return err;

		printk("Searching the bus...\n");
		err = ds_search(ds_dev, init, buf, 3, 0);

		printk("ds_search() returned %d\n", err);

		if (err < 0)
			return err;
		for (i=0; i<err; ++i)
			printk("%d: %llx\n", i, buf[i]);

		return 0;
	}
#endif

	return 0;
}

static void ds_disconnect(struct usb_interface *intf)
{
	struct ds_device *dev;

	dev = usb_get_intfdata(intf);
	usb_set_intfdata(intf, NULL);

	while (atomic_read(&dev->refcnt)) {
		printk(KERN_INFO "Waiting for DS to become free: refcnt=%d.\n",
				atomic_read(&dev->refcnt));

		if (msleep_interruptible(1000))
			flush_signals(current);
	}

	usb_put_dev(dev->udev);
	kfree(dev);
	ds_dev = NULL;
}

static int ds_init(void)
{
	int err;

	err = usb_register(&ds_driver);
	if (err) {
		printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
		return err;
	}

	return 0;
}

static void ds_fini(void)
{
	usb_deregister(&ds_driver);
}

module_init(ds_init);
module_exit(ds_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");

EXPORT_SYMBOL(ds_touch_bit);
EXPORT_SYMBOL(ds_read_byte);
EXPORT_SYMBOL(ds_read_bit);
EXPORT_SYMBOL(ds_read_block);
EXPORT_SYMBOL(ds_write_byte);
EXPORT_SYMBOL(ds_write_bit);
EXPORT_SYMBOL(ds_write_block);
EXPORT_SYMBOL(ds_reset);
EXPORT_SYMBOL(ds_get_device);
EXPORT_SYMBOL(ds_put_device);

/*
 * This functions can be used for EEPROM programming,
 * when driver will be included into mainline this will
 * require uncommenting.
 */
#if 0
EXPORT_SYMBOL(ds_start_pulse);
EXPORT_SYMBOL(ds_set_speed);
EXPORT_SYMBOL(ds_detect);
EXPORT_SYMBOL(ds_stop_pulse);
EXPORT_SYMBOL(ds_search);
#endif
Commit	Line	Data
1da177e4	1	/*
8949d2aa	2	* dscore.c
1da177e4 LT	3	*
1da177e4 LT	4	* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
8949d2aa	5	*
1da177e4 LT	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/kernel.h>
	24	#include <linux/mod_devicetable.h>
	25	#include <linux/usb.h>
	26
	27	#include "dscore.h"
	28
	29	static struct usb_device_id ds_id_table [] = {
	30	{ USB_DEVICE(0x04fa, 0x2490) },
	31	{ },
	32	};
	33	MODULE_DEVICE_TABLE(usb, ds_id_table);
	34
8949d2aa EP	35	static int ds_probe(struct usb_interface , const struct usb_device_id );
8949d2aa EP	36	static void ds_disconnect(struct usb_interface *);
1da177e4 LT	37
	38	int ds_touch_bit(struct ds_device , u8, u8 );
	39	int ds_read_byte(struct ds_device , u8 );
	40	int ds_read_bit(struct ds_device , u8 );
	41	int ds_write_byte(struct ds_device *, u8);
	42	int ds_write_bit(struct ds_device *, u8);
8949d2aa	43	static int ds_start_pulse(struct ds_device *, int);
1da177e4	44	int ds_reset(struct ds_device , struct ds_status );
1da177e4 LT	45	struct ds_device * ds_get_device(void);
	46	void ds_put_device(struct ds_device *);
	47
	48	static inline void ds_dump_status(unsigned char , unsigned char , int);
	49	static int ds_send_control(struct ds_device *, u16, u16);
	50	static int ds_send_control_mode(struct ds_device *, u16, u16);
	51	static int ds_send_control_cmd(struct ds_device *, u16, u16);
	52
	53
	54	static struct usb_driver ds_driver = {
	55	.owner = THIS_MODULE,
	56	.name = "DS9490R",
	57	.probe = ds_probe,
	58	.disconnect = ds_disconnect,
	59	.id_table = ds_id_table,
	60	};
	61
	62	static struct ds_device *ds_dev;
	63
	64	struct ds_device * ds_get_device(void)
	65	{
	66	if (ds_dev)
	67	atomic_inc(&ds_dev->refcnt);
	68	return ds_dev;
	69	}
	70
	71	void ds_put_device(struct ds_device *dev)
	72	{
	73	atomic_dec(&dev->refcnt);
	74	}
	75
	76	static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
	77	{
	78	int err;
8949d2aa EP	79
8949d2aa EP	80	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
1da177e4 LT	81	CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
1da177e4 LT	82	if (err < 0) {
8949d2aa	83	printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
1da177e4 LT	84	value, index, err);
	85	return err;
	86	}
	87
	88	return err;
	89	}
	90
	91	static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
	92	{
	93	int err;
8949d2aa EP	94
8949d2aa EP	95	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
1da177e4 LT	96	MODE_CMD, 0x40, value, index, NULL, 0, 1000);
1da177e4 LT	97	if (err < 0) {
8949d2aa	98	printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
1da177e4 LT	99	value, index, err);
	100	return err;
	101	}
	102
	103	return err;
	104	}
	105
	106	static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
	107	{
	108	int err;
8949d2aa EP	109
8949d2aa EP	110	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
1da177e4 LT	111	COMM_CMD, 0x40, value, index, NULL, 0, 1000);
1da177e4 LT	112	if (err < 0) {
8949d2aa	113	printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
1da177e4 LT	114	value, index, err);
	115	return err;
	116	}
	117
	118	return err;
	119	}
	120
	121	static inline void ds_dump_status(unsigned char buf, unsigned char str, int off)
	122	{
	123	printk("%45s: %8x\n", str, buf[off]);
	124	}
	125
8949d2aa EP	126	static int ds_recv_status_nodump(struct ds_device dev, struct ds_status st,
8949d2aa EP	127	unsigned char *buf, int size)
1da177e4 LT	128	{
1da177e4 LT	129	int count, err;
8949d2aa	130
1da177e4	131	memset(st, 0, sizeof(st));
8949d2aa	132
1da177e4 LT	133	count = 0;
	134	err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
	135	if (err < 0) {
	136	printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
	137	return err;
	138	}
8949d2aa	139
1da177e4 LT	140	if (count >= sizeof(*st))
	141	memcpy(st, buf, sizeof(*st));
	142
	143	return count;
	144	}
	145
	146	static int ds_recv_status(struct ds_device dev, struct ds_status st)
	147	{
	148	unsigned char buf[64];
	149	int count, err = 0, i;
8949d2aa	150
1da177e4	151	memcpy(st, buf, sizeof(*st));
8949d2aa	152
1da177e4 LT	153	count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
	154	if (count < 0)
	155	return err;
8949d2aa	156
1da177e4 LT	157	printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
	158	for (i=0; i<count; ++i)
	159	printk("%02x ", buf[i]);
	160	printk("\n");
	161
	162	if (count >= 16) {
	163	ds_dump_status(buf, "enable flag", 0);
	164	ds_dump_status(buf, "1-wire speed", 1);
	165	ds_dump_status(buf, "strong pullup duration", 2);
	166	ds_dump_status(buf, "programming pulse duration", 3);
	167	ds_dump_status(buf, "pulldown slew rate control", 4);
	168	ds_dump_status(buf, "write-1 low time", 5);
	169	ds_dump_status(buf, "data sample offset/write-0 recovery time", 6);
	170	ds_dump_status(buf, "reserved (test register)", 7);
	171	ds_dump_status(buf, "device status flags", 8);
	172	ds_dump_status(buf, "communication command byte 1", 9);
	173	ds_dump_status(buf, "communication command byte 2", 10);
	174	ds_dump_status(buf, "communication command buffer status", 11);
	175	ds_dump_status(buf, "1-wire data output buffer status", 12);
	176	ds_dump_status(buf, "1-wire data input buffer status", 13);
	177	ds_dump_status(buf, "reserved", 14);
	178	ds_dump_status(buf, "reserved", 15);
	179	}
	180
	181	memcpy(st, buf, sizeof(*st));
	182
	183	if (st->status & ST_EPOF) {
	184	printk(KERN_INFO "Resetting device after ST_EPOF.\n");
	185	err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
	186	if (err)
	187	return err;
	188	count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
	189	if (count < 0)
	190	return err;
	191	}
	192	#if 0
	193	if (st->status & ST_IDLE) {
	194	printk(KERN_INFO "Resetting pulse after ST_IDLE.\n");
	195	err = ds_start_pulse(dev, PULLUP_PULSE_DURATION);
	196	if (err)
	197	return err;
	198	}
	199	#endif
8949d2aa	200
1da177e4 LT	201	return err;
	202	}
	203
	204	static int ds_recv_data(struct ds_device dev, unsigned char buf, int size)
	205	{
	206	int count, err;
	207	struct ds_status st;
8949d2aa	208
1da177e4	209	count = 0;
8949d2aa	210	err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
1da177e4 LT	211	buf, size, &count, 1000);
	212	if (err < 0) {
	213	printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
	214	usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
	215	ds_recv_status(dev, &st);
	216	return err;
	217	}
	218
	219	#if 0
	220	{
	221	int i;
	222
	223	printk("%s: count=%d: ", __func__, count);
	224	for (i=0; i<count; ++i)
	225	printk("%02x ", buf[i]);
	226	printk("\n");
	227	}
	228	#endif
	229	return count;
	230	}
	231
	232	static int ds_send_data(struct ds_device dev, unsigned char buf, int len)
	233	{
	234	int count, err;
8949d2aa	235
1da177e4 LT	236	count = 0;
	237	err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
	238	if (err < 0) {
	239	printk(KERN_ERR "Failed to read 1-wire data from 0x02: err=%d.\n", err);
	240	return err;
	241	}
	242
	243	return err;
	244	}
	245
8949d2aa EP	246	#if 0
8949d2aa EP	247
1da177e4 LT	248	int ds_stop_pulse(struct ds_device *dev, int limit)
	249	{
	250	struct ds_status st;
	251	int count = 0, err = 0;
	252	u8 buf[0x20];
8949d2aa	253
1da177e4 LT	254	do {
	255	err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
	256	if (err)
	257	break;
	258	err = ds_send_control(dev, CTL_RESUME_EXE, 0);
	259	if (err)
	260	break;
	261	err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
	262	if (err)
	263	break;
	264
	265	if ((st.status & ST_SPUA) == 0) {
	266	err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
	267	if (err)
	268	break;
	269	}
	270	} while(++count < limit);
	271
	272	return err;
	273	}
	274
	275	int ds_detect(struct ds_device dev, struct ds_status st)
	276	{
	277	int err;
8949d2aa	278
1da177e4 LT	279	err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
	280	if (err)
	281	return err;
	282
	283	err = ds_send_control(dev, COMM_SET_DURATION \| COMM_IM, 0);
	284	if (err)
	285	return err;
8949d2aa	286
1da177e4 LT	287	err = ds_send_control(dev, COMM_SET_DURATION \| COMM_IM \| COMM_TYPE, 0x40);
	288	if (err)
	289	return err;
8949d2aa	290
1da177e4 LT	291	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
	292	if (err)
	293	return err;
	294
	295	err = ds_recv_status(dev, st);
	296
	297	return err;
	298	}
	299
8949d2aa EP	300	#endif /* 0 */
	301
	302	static int ds_wait_status(struct ds_device dev, struct ds_status st)
1da177e4 LT	303	{
	304	u8 buf[0x20];
	305	int err, count = 0;
	306
	307	do {
	308	err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
	309	#if 0
8949d2aa	310	if (err >= 0) {
1da177e4 LT	311	int i;
	312	printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
	313	for (i=0; i<err; ++i)
	314	printk("%02x ", buf[i]);
	315	printk("\n");
	316	}
	317	#endif
	318	} while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100);
	319
	320
	321	if (((err > 16) && (buf[0x10] & 0x01)) \|\| count >= 100 \|\| err < 0) {
	322	ds_recv_status(dev, st);
	323	return -1;
8949d2aa	324	} else
1da177e4	325	return 0;
1da177e4 LT	326	}
	327
	328	int ds_reset(struct ds_device dev, struct ds_status st)
	329	{
	330	int err;
	331
	332	//err = ds_send_control(dev, COMM_1_WIRE_RESET \| COMM_F \| COMM_IM \| COMM_SE, SPEED_FLEXIBLE);
	333	err = ds_send_control(dev, 0x43, SPEED_NORMAL);
	334	if (err)
	335	return err;
	336
	337	ds_wait_status(dev, st);
	338	#if 0
	339	if (st->command_buffer_status) {
	340	printk(KERN_INFO "Short circuit.\n");
	341	return -EIO;
	342	}
	343	#endif
	344
	345	return 0;
	346	}
	347
8949d2aa	348	#if 0
1da177e4 LT	349	int ds_set_speed(struct ds_device *dev, int speed)
	350	{
	351	int err;
	352
	353	if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
	354	return -EINVAL;
	355
	356	if (speed != SPEED_OVERDRIVE)
	357	speed = SPEED_FLEXIBLE;
	358
	359	speed &= 0xff;
8949d2aa	360
1da177e4 LT	361	err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
	362	if (err)
	363	return err;
	364
	365	return err;
	366	}
8949d2aa	367	#endif /* 0 */
1da177e4	368
8949d2aa	369	static int ds_start_pulse(struct ds_device *dev, int delay)
1da177e4 LT	370	{
	371	int err;
	372	u8 del = 1 + (u8)(delay >> 4);
	373	struct ds_status st;
8949d2aa	374
1da177e4 LT	375	#if 0
	376	err = ds_stop_pulse(dev, 10);
	377	if (err)
	378	return err;
	379
	380	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
	381	if (err)
	382	return err;
	383	#endif
	384	err = ds_send_control(dev, COMM_SET_DURATION \| COMM_IM, del);
	385	if (err)
	386	return err;
	387
	388	err = ds_send_control(dev, COMM_PULSE \| COMM_IM \| COMM_F, 0);
	389	if (err)
	390	return err;
	391
	392	mdelay(delay);
	393
	394	ds_wait_status(dev, &st);
8949d2aa	395
1da177e4 LT	396	return err;
	397	}
	398
	399	int ds_touch_bit(struct ds_device dev, u8 bit, u8 tbit)
	400	{
	401	int err, count;
	402	struct ds_status st;
	403	u16 value = (COMM_BIT_IO \| COMM_IM) \| ((bit) ? COMM_D : 0);
	404	u16 cmd;
8949d2aa	405
1da177e4 LT	406	err = ds_send_control(dev, value, 0);
	407	if (err)
	408	return err;
	409
	410	count = 0;
	411	do {
	412	err = ds_wait_status(dev, &st);
	413	if (err)
	414	return err;
	415
	416	cmd = st.command0 \| (st.command1 << 8);
	417	} while (cmd != value && ++count < 10);
	418
	419	if (err < 0 \|\| count >= 10) {
	420	printk(KERN_ERR "Failed to obtain status.\n");
	421	return -EINVAL;
	422	}
	423
	424	err = ds_recv_data(dev, tbit, sizeof(*tbit));
	425	if (err < 0)
	426	return err;
	427
	428	return 0;
	429	}
	430
	431	int ds_write_bit(struct ds_device *dev, u8 bit)
	432	{
	433	int err;
	434	struct ds_status st;
8949d2aa	435
1da177e4 LT	436	err = ds_send_control(dev, COMM_BIT_IO \| COMM_IM \| (bit) ? COMM_D : 0, 0);
	437	if (err)
	438	return err;
	439
	440	ds_wait_status(dev, &st);
	441
	442	return 0;
	443	}
	444
	445	int ds_write_byte(struct ds_device *dev, u8 byte)
	446	{
	447	int err;
	448	struct ds_status st;
	449	u8 rbyte;
8949d2aa	450
1da177e4 LT	451	err = ds_send_control(dev, COMM_BYTE_IO \| COMM_IM \| COMM_SPU, byte);
	452	if (err)
	453	return err;
	454
	455	err = ds_wait_status(dev, &st);
	456	if (err)
	457	return err;
8949d2aa	458
1da177e4 LT	459	err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
	460	if (err < 0)
	461	return err;
8949d2aa	462
1da177e4 LT	463	ds_start_pulse(dev, PULLUP_PULSE_DURATION);
	464
	465	return !(byte == rbyte);
	466	}
	467
	468	int ds_read_bit(struct ds_device dev, u8 bit)
	469	{
	470	int err;
	471
	472	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
	473	if (err)
	474	return err;
8949d2aa	475
1da177e4 LT	476	err = ds_send_control(dev, COMM_BIT_IO \| COMM_IM \| COMM_SPU \| COMM_D, 0);
	477	if (err)
	478	return err;
8949d2aa	479
1da177e4 LT	480	err = ds_recv_data(dev, bit, sizeof(*bit));
	481	if (err < 0)
	482	return err;
	483
	484	return 0;
	485	}
	486
	487	int ds_read_byte(struct ds_device dev, u8 byte)
	488	{
	489	int err;
	490	struct ds_status st;
	491
	492	err = ds_send_control(dev, COMM_BYTE_IO \| COMM_IM , 0xff);
	493	if (err)
	494	return err;
	495
	496	ds_wait_status(dev, &st);
8949d2aa	497
1da177e4 LT	498	err = ds_recv_data(dev, byte, sizeof(*byte));
	499	if (err < 0)
	500	return err;
	501
	502	return 0;
	503	}
	504
	505	int ds_read_block(struct ds_device dev, u8 buf, int len)
	506	{
	507	struct ds_status st;
	508	int err;
	509
	510	if (len > 64*1024)
	511	return -E2BIG;
	512
	513	memset(buf, 0xFF, len);
8949d2aa	514
1da177e4 LT	515	err = ds_send_data(dev, buf, len);
	516	if (err < 0)
	517	return err;
8949d2aa	518
1da177e4 LT	519	err = ds_send_control(dev, COMM_BLOCK_IO \| COMM_IM \| COMM_SPU, len);
	520	if (err)
	521	return err;
	522
	523	ds_wait_status(dev, &st);
8949d2aa	524
1da177e4 LT	525	memset(buf, 0x00, len);
	526	err = ds_recv_data(dev, buf, len);
	527
	528	return err;
	529	}
	530
	531	int ds_write_block(struct ds_device dev, u8 buf, int len)
	532	{
	533	int err;
	534	struct ds_status st;
8949d2aa	535
1da177e4 LT	536	err = ds_send_data(dev, buf, len);
	537	if (err < 0)
	538	return err;
8949d2aa	539
1da177e4 LT	540	ds_wait_status(dev, &st);
	541
	542	err = ds_send_control(dev, COMM_BLOCK_IO \| COMM_IM \| COMM_SPU, len);
	543	if (err)
	544	return err;
	545
	546	ds_wait_status(dev, &st);
	547
	548	err = ds_recv_data(dev, buf, len);
	549	if (err < 0)
	550	return err;
	551
	552	ds_start_pulse(dev, PULLUP_PULSE_DURATION);
8949d2aa	553
1da177e4 LT	554	return !(err == len);
	555	}
	556
8949d2aa EP	557	#if 0
8949d2aa EP	558
1da177e4 LT	559	int ds_search(struct ds_device dev, u64 init, u64 buf, u8 id_number, int conditional_search)
	560	{
	561	int err;
	562	u16 value, index;
	563	struct ds_status st;
	564
	565	memset(buf, 0, sizeof(buf));
8949d2aa	566
1da177e4 LT	567	err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
	568	if (err)
	569	return err;
8949d2aa	570
1da177e4 LT	571	ds_wait_status(ds_dev, &st);
	572
	573	value = COMM_SEARCH_ACCESS \| COMM_IM \| COMM_SM \| COMM_F \| COMM_RTS;
	574	index = (conditional_search ? 0xEC : 0xF0) \| (id_number << 8);
	575	err = ds_send_control(ds_dev, value, index);
	576	if (err)
	577	return err;
	578
	579	ds_wait_status(ds_dev, &st);
	580
	581	err = ds_recv_data(ds_dev, (unsigned char )buf, 8id_number);
	582	if (err < 0)
	583	return err;
	584
	585	return err/8;
	586	}
	587
	588	int ds_match_access(struct ds_device *dev, u64 init)
	589	{
	590	int err;
	591	struct ds_status st;
	592
	593	err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
	594	if (err)
	595	return err;
8949d2aa	596
1da177e4 LT	597	ds_wait_status(dev, &st);
	598
	599	err = ds_send_control(dev, COMM_MATCH_ACCESS \| COMM_IM \| COMM_RST, 0x0055);
	600	if (err)
	601	return err;
	602
	603	ds_wait_status(dev, &st);
	604
	605	return 0;
	606	}
	607
	608	int ds_set_path(struct ds_device *dev, u64 init)
	609	{
	610	int err;
	611	struct ds_status st;
	612	u8 buf[9];
	613
	614	memcpy(buf, &init, 8);
	615	buf[8] = BRANCH_MAIN;
8949d2aa	616
1da177e4 LT	617	err = ds_send_data(dev, buf, sizeof(buf));
	618	if (err)
	619	return err;
8949d2aa	620
1da177e4 LT	621	ds_wait_status(dev, &st);
	622
	623	err = ds_send_control(dev, COMM_SET_PATH \| COMM_IM \| COMM_RST, 0);
	624	if (err)
	625	return err;
	626
	627	ds_wait_status(dev, &st);
	628
	629	return 0;
	630	}
	631
8949d2aa EP	632	#endif /* 0 */
	633
	634	static int ds_probe(struct usb_interface *intf,
	635	const struct usb_device_id *udev_id)
1da177e4 LT	636	{
	637	struct usb_device *udev = interface_to_usbdev(intf);
	638	struct usb_endpoint_descriptor *endpoint;
	639	struct usb_host_interface *iface_desc;
	640	int i, err;
	641
	642	ds_dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
	643	if (!ds_dev) {
	644	printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
	645	return -ENOMEM;
	646	}
	647
	648	ds_dev->udev = usb_get_dev(udev);
	649	usb_set_intfdata(intf, ds_dev);
	650
	651	err = usb_set_interface(ds_dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
	652	if (err) {
	653	printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
	654	intf->altsetting[0].desc.bInterfaceNumber, err);
	655	return err;
	656	}
	657
	658	err = usb_reset_configuration(ds_dev->udev);
	659	if (err) {
	660	printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
	661	return err;
	662	}
8949d2aa	663
1da177e4 LT	664	iface_desc = &intf->altsetting[0];
	665	if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
	666	printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
	667	return -ENODEV;
	668	}
	669
	670	atomic_set(&ds_dev->refcnt, 0);
	671	memset(ds_dev->ep, 0, sizeof(ds_dev->ep));
8949d2aa	672
1da177e4	673	/*
8949d2aa	674	* This loop doesn'd show control 0 endpoint,
1da177e4 LT	675	* so we will fill only 1-3 endpoints entry.
	676	*/
	677	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	678	endpoint = &iface_desc->endpoint[i].desc;
	679
	680	ds_dev->ep[i+1] = endpoint->bEndpointAddress;
8949d2aa	681
1da177e4 LT	682	printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
	683	i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
	684	(endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
	685	endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
	686	}
8949d2aa	687
1da177e4 LT	688	#if 0
	689	{
	690	int err, i;
	691	u64 buf[3];
	692	u64 init=0xb30000002078ee81ull;
	693	struct ds_status st;
8949d2aa	694
1da177e4 LT	695	ds_reset(ds_dev, &st);
	696	err = ds_search(ds_dev, init, buf, 3, 0);
	697	if (err < 0)
	698	return err;
	699	for (i=0; i<err; ++i)
	700	printk("%d: %llx\n", i, buf[i]);
8949d2aa EP	701
8949d2aa EP	702	printk("Resetting...\n");
1da177e4 LT	703	ds_reset(ds_dev, &st);
	704	printk("Setting path for %llx.\n", init);
	705	err = ds_set_path(ds_dev, init);
	706	if (err)
	707	return err;
	708	printk("Calling MATCH_ACCESS.\n");
	709	err = ds_match_access(ds_dev, init);
	710	if (err)
	711	return err;
	712
	713	printk("Searching the bus...\n");
	714	err = ds_search(ds_dev, init, buf, 3, 0);
	715
	716	printk("ds_search() returned %d\n", err);
8949d2aa	717
1da177e4 LT	718	if (err < 0)
	719	return err;
	720	for (i=0; i<err; ++i)
	721	printk("%d: %llx\n", i, buf[i]);
8949d2aa	722
1da177e4 LT	723	return 0;
	724	}
	725	#endif
	726
	727	return 0;
	728	}
	729
8949d2aa	730	static void ds_disconnect(struct usb_interface *intf)
1da177e4 LT	731	{
1da177e4 LT	732	struct ds_device *dev;
8949d2aa	733
1da177e4 LT	734	dev = usb_get_intfdata(intf);
	735	usb_set_intfdata(intf, NULL);
	736
	737	while (atomic_read(&dev->refcnt)) {
	738	printk(KERN_INFO "Waiting for DS to become free: refcnt=%d.\n",
	739	atomic_read(&dev->refcnt));
	740
	741	if (msleep_interruptible(1000))
	742	flush_signals(current);
	743	}
	744
	745	usb_put_dev(dev->udev);
	746	kfree(dev);
	747	ds_dev = NULL;
	748	}
	749
8949d2aa	750	static int ds_init(void)
1da177e4 LT	751	{
	752	int err;
	753
	754	err = usb_register(&ds_driver);
	755	if (err) {
	756	printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
	757	return err;
	758	}
	759
	760	return 0;
	761	}
	762
8949d2aa	763	static void ds_fini(void)
1da177e4 LT	764	{
	765	usb_deregister(&ds_driver);
	766	}
	767
	768	module_init(ds_init);
	769	module_exit(ds_fini);
	770
	771	MODULE_LICENSE("GPL");
	772	MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
	773
	774	EXPORT_SYMBOL(ds_touch_bit);
	775	EXPORT_SYMBOL(ds_read_byte);
	776	EXPORT_SYMBOL(ds_read_bit);
	777	EXPORT_SYMBOL(ds_read_block);
	778	EXPORT_SYMBOL(ds_write_byte);
	779	EXPORT_SYMBOL(ds_write_bit);
	780	EXPORT_SYMBOL(ds_write_block);
	781	EXPORT_SYMBOL(ds_reset);
	782	EXPORT_SYMBOL(ds_get_device);
	783	EXPORT_SYMBOL(ds_put_device);
	784
	785	/*
8949d2aa EP	786	* This functions can be used for EEPROM programming,
8949d2aa EP	787	* when driver will be included into mainline this will
1da177e4 LT	788	* require uncommenting.
	789	*/
	790	#if 0
	791	EXPORT_SYMBOL(ds_start_pulse);
	792	EXPORT_SYMBOL(ds_set_speed);
	793	EXPORT_SYMBOL(ds_detect);
	794	EXPORT_SYMBOL(ds_stop_pulse);
	795	EXPORT_SYMBOL(ds_search);
	796	#endif