usb-gigaset.c

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/*
 * USB driver for Gigaset 307x directly or using M105 Data.
 *
 * Copyright (c) 2001 by Stefan Eilers
 *                   and Hansjoerg Lipp <[e-mail]>.
 *
 * This driver was derived from the USB skeleton driver by
 * Greg Kroah-Hartman <[e-mail]>
 *
 * =====================================================================
 *	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.
 * =====================================================================
 */

#include "gigaset.h"

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

/* Version Information */
#define DRIVER_AUTHOR "Hansjoerg Lipp <[e-mail]>, Stefan Eilers"
#define DRIVER_DESC "USB Driver for Gigaset 307x using M105"

/* Module parameters */

static int startmode = SM_ISDN;
static int cidmode = 1;

module_param(startmode, int, S_IRUGO);
module_param(cidmode, int, S_IRUGO);
MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
MODULE_PARM_DESC(cidmode, "Call-ID mode");

#define GIGASET_MINORS     1
#define GIGASET_MINOR      8
#define GIGASET_MODULENAME "usb_gigaset"
#define GIGASET_DEVFSNAME  "gig/usb/"
#define GIGASET_DEVNAME    "ttyGU"

#define IF_WRITEBUF 2000 //FIXME  // WAKEUP_CHARS: 256

/* Values for the Gigaset M105 Data */
#define USB_M105_VENDOR_ID	0x0681
#define USB_M105_PRODUCT_ID	0x0009

/* table of devices that work with this driver */
static struct usb_device_id gigaset_table [] = {
	{ USB_DEVICE(USB_M105_VENDOR_ID, USB_M105_PRODUCT_ID) },
	{ }					/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, gigaset_table);

/*
 * Control requests (empty fields: 00)
 *
 *       RT|RQ|VALUE|INDEX|LEN  |DATA
 * In:
 *       C1 08             01
 *            Get flags (1 byte). Bits: 0=dtr,1=rts,3-7:?
 *       C1 0F             ll ll
 *            Get device information/status (llll: 0x200 and 0x40 seen).
 *            Real size: I only saw MIN(llll,0x64).
 *            Contents: seems to be always the same...
 *              offset 0x00: Length of this structure (0x64) (len: 1,2,3 bytes)
 *              offset 0x3c: String (16 bit chars): "MCCI USB Serial V2.0"
 *              rest:        ?
 * Out:
 *       41 11
 *            Initialize/reset device ?
 *       41 00 xx 00
 *            ? (xx=00 or 01; 01 on start, 00 on close)
 *       41 07 vv mm
 *            Set/clear flags vv=value, mm=mask (see RQ 08)
 *       41 12 xx
 *            Used before the following configuration requests are issued
 *            (with xx=0x0f). I've seen other values<0xf, though.
 *       41 01 xx xx
 *            Set baud rate. xxxx=ceil(0x384000/rate)=trunc(0x383fff/rate)+1.
 *       41 03 ps bb
 *            Set byte size and parity. p:  0x20=even,0x10=odd,0x00=no parity
 *                                     [    0x30: m, 0x40: s           ]
 *                                     [s:  0: 1 stop bit; 1: 1.5; 2: 2]
 *                                      bb: bits/byte (seen 7 and 8)
 *       41 13 -- -- -- -- 10 00 ww 00 00 00 xx 00 00 00 yy 00 00 00 zz 00 00 00
 *            ??
 *            Initialization: 01, 40, 00, 00
 *            Open device:    00  40, 00, 00
 *            yy and zz seem to be equal, either 0x00 or 0x0a
 *            (ww,xx) pairs seen: (00,00), (00,40), (01,40), (09,80), (19,80)
 *       41 19 -- -- -- -- 06 00 00 00 00 xx 11 13
 *            Used after every "configuration sequence" (RQ 12, RQs 01/03/13).
 *            xx is usually 0x00 but was 0x7e before starting data transfer
 *            in unimodem mode. So, this might be an array of characters that need
 *            special treatment ("commit all bufferd data"?), 11=^Q, 13=^S.
 *
 * Unimodem mode: use "modprobe ppp_async flag_time=0" as the device _needs_ two
 * flags per packet.
 */

static int gigaset_probe(struct usb_interface *interface,
			 const struct usb_device_id *id);
static void gigaset_disconnect(struct usb_interface *interface);

static struct gigaset_driver *driver = NULL;
static struct cardstate *cardstate = NULL;

/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver gigaset_usb_driver = {
	.name =		GIGASET_MODULENAME,
	.probe =	gigaset_probe,
	.disconnect =	gigaset_disconnect,
	.id_table =	gigaset_table,
};

struct usb_cardstate {
	struct usb_device	*udev;		/* usb device pointer */
	struct usb_interface	*interface;	/* interface for this device */
	atomic_t		busy;		/* bulk output in progress */

	/* Output buffer */
	unsigned char		*bulk_out_buffer;
	int			bulk_out_size;
	__u8			bulk_out_endpointAddr;
	struct urb		*bulk_out_urb;

	/* Input buffer */
	int			rcvbuf_size;
	struct urb		*read_urb;
	__u8			int_in_endpointAddr;

	char			bchars[6];		/* for request 0x19 */
};

struct usb_bc_state {};

static inline unsigned tiocm_to_gigaset(unsigned state)
{
	return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
}

#ifdef CONFIG_GIGASET_UNDOCREQ
/* WARNING: EXPERIMENTAL! */
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
				  unsigned new_state)
{
	struct usb_device *udev = cs->hw.usb->udev;
	unsigned mask, val;
	int r;

	mask = tiocm_to_gigaset(old_state ^ new_state);
	val = tiocm_to_gigaset(new_state);

	gig_dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
	// don't use this in an interrupt/BH
	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 7, 0x41,
			    (val & 0xff) | ((mask & 0xff) << 8), 0,
			    NULL, 0, 2000 /* timeout? */);
	if (r < 0)
		return r;
	//..
	return 0;
}

static int set_value(struct cardstate *cs, u8 req, u16 val)
{
	struct usb_device *udev = cs->hw.usb->udev;
	int r, r2;

	gig_dbg(DEBUG_USBREQ, "request %02x (%04x)",
		(unsigned)req, (unsigned)val);
	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x12, 0x41,
			    0xf /*?*/, 0, NULL, 0, 2000 /*?*/);
			    /* no idea what this does */
	if (r < 0) {
		dev_err(&udev->dev, "error %d on request 0x12\n", -r);
		return r;
	}

	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), req, 0x41,
			    val, 0, NULL, 0, 2000 /*?*/);
	if (r < 0)
		dev_err(&udev->dev, "error %d on request 0x%02x\n",
			-r, (unsigned)req);

	r2 = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
			     0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
	if (r2 < 0)
		dev_err(&udev->dev, "error %d on request 0x19\n", -r2);

	return r < 0 ? r : (r2 < 0 ? r2 : 0);
}

/* WARNING: HIGHLY EXPERIMENTAL! */
// don't use this in an interrupt/BH
static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
{
	u16 val;
	u32 rate;

	cflag &= CBAUD;

	switch (cflag) {
	//FIXME more values?
	case    B300: rate =     300; break;
	case    B600: rate =     600; break;
	case   B1200: rate =    1200; break;
	case   B2400: rate =    2400; break;
	case   B4800: rate =    4800; break;
	case   B9600: rate =    9600; break;
	case  B19200: rate =   19200; break;
	case  B38400: rate =   38400; break;
	case  B57600: rate =   57600; break;
	case B115200: rate =  115200; break;
	default:
		rate =  9600;
		dev_err(cs->dev, "unsupported baudrate request 0x%x,"
			" using default of B9600\n", cflag);
	}

	val = 0x383fff / rate + 1;

	return set_value(cs, 1, val);
}

/* WARNING: HIGHLY EXPERIMENTAL! */
// don't use this in an interrupt/BH
static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
{
	u16 val = 0;

	/* set the parity */
	if (cflag & PARENB)
		val |= (cflag & PARODD) ? 0x10 : 0x20;

	/* set the number of data bits */
	switch (cflag & CSIZE) {
	case CS5:
		val |= 5 << 8; break;
	case CS6:
		val |= 6 << 8; break;
	case CS7:
		val |= 7 << 8; break;
	case CS8:
		val |= 8 << 8; break;
	default:
		dev_err(cs->dev, "CSIZE was not CS5-CS8, using default of 8\n");
		val |= 8 << 8;
		break;
	}

	/* set the number of stop bits */
	if (cflag & CSTOPB) {
		if ((cflag & CSIZE) == CS5)
			val |= 1; /* 1.5 stop bits */ //FIXME is this okay?
		else
			val |= 2; /* 2 stop bits */
	}

	return set_value(cs, 3, val);
}

#else
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
				  unsigned new_state)
{
	return -EINVAL;
}

static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
{
	return -EINVAL;
}

static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
{
	return -EINVAL;
}
#endif


 /*================================================================================================================*/
static int gigaset_init_bchannel(struct bc_state *bcs)
{
	/* nothing to do for M10x */
	gigaset_bchannel_up(bcs);
	return 0;
}

static int gigaset_close_bchannel(struct bc_state *bcs)
{
	/* nothing to do for M10x */
	gigaset_bchannel_down(bcs);
	return 0;
}

static int write_modem(struct cardstate *cs);
static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb);


/* Write tasklet handler: Continue sending current skb, or send command, or
 * start sending an skb from the send queue.
 */
static void gigaset_modem_fill(unsigned long data)
{
	struct cardstate *cs = (struct cardstate *) data;
	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
	struct cmdbuf_t *cb;
	unsigned long flags;
	int again;

	gig_dbg(DEBUG_OUTPUT, "modem_fill");

	if (atomic_read(&cs->hw.usb->busy)) {
		gig_dbg(DEBUG_OUTPUT, "modem_fill: busy");
		return;
	}

	do {
		again = 0;
		if (!bcs->tx_skb) { /* no skb is being sent */
			spin_lock_irqsave(&cs->cmdlock, flags);
			cb = cs->cmdbuf;
			spin_unlock_irqrestore(&cs->cmdlock, flags);
			if (cb) { /* commands to send? */
				gig_dbg(DEBUG_OUTPUT, "modem_fill: cb");
				if (send_cb(cs, cb) < 0) {
					gig_dbg(DEBUG_OUTPUT,
						"modem_fill: send_cb failed");
					again = 1; /* no callback will be
						      called! */
				}
			} else { /* skbs to send? */
				bcs->tx_skb = skb_dequeue(&bcs->squeue);
				if (bcs->tx_skb)
					gig_dbg(DEBUG_INTR,
						"Dequeued skb (Adr: %lx)!",
						(unsigned long) bcs->tx_skb);
			}
		}

		if (bcs->tx_skb) {
			gig_dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
			if (write_modem(cs) < 0) {
				gig_dbg(DEBUG_OUTPUT,
					"modem_fill: write_modem failed");
				// FIXME should we tell the LL?
				again = 1; /* no callback will be called! */
			}
		}
	} while (again);
}

/**
 *	gigaset_read_int_callback
 *
 *	It is called if the data was received from the device.
 */
static void gigaset_read_int_callback(struct urb *urb, struct pt_regs *regs)
{
	struct inbuf_t *inbuf = urb->context;
	struct cardstate *cs = inbuf->cs;
	int resubmit = 0;
	int r;
	unsigned numbytes;
	unsigned char *src;
	unsigned long flags;

	if (!urb->status) {
		if (!cs->connected) {
			err("%s: disconnected", __func__); /* should never happen */
			return;
		}

		numbytes = urb->actual_length;

		if (numbytes) {
			src = inbuf->rcvbuf;
			if (unlikely(*src))
				dev_warn(cs->dev,
				    "%s: There was no leading 0, but 0x%02x!\n",
					 __func__, (unsigned) *src);
			++src; /* skip leading 0x00 */
			--numbytes;
			if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
				gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
				gigaset_schedule_event(inbuf->cs);
			}
		} else
			gig_dbg(DEBUG_INTR, "Received zero block length");
		resubmit = 1;
	} else {
		/* The urb might have been killed. */
		gig_dbg(DEBUG_ANY, "%s - nonzero read bulk status received: %d",
			__func__, urb->status);
		if (urb->status != -ENOENT) { /* not killed */
			if (!cs->connected) {
				err("%s: disconnected", __func__); /* should never happen */
				return;
			}
			resubmit = 1;
		}
	}

	if (resubmit) {
		spin_lock_irqsave(&cs->lock, flags);
		r = cs->connected ? usb_submit_urb(urb, SLAB_ATOMIC) : -ENODEV;
		spin_unlock_irqrestore(&cs->lock, flags);
		if (r)
			dev_err(cs->dev, "error %d when resubmitting urb.\n",
				-r);
	}
}


/* This callback routine is called when data was transmitted to the device. */
static void gigaset_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
	struct cardstate *cs = urb->context;
	unsigned long flags;

	if (urb->status)
		dev_err(cs->dev, "bulk transfer failed (status %d)\n",
			-urb->status);
		/* That's all we can do. Communication problems
		   are handled by timeouts or network protocols. */

	spin_lock_irqsave(&cs->lock, flags);
	if (!cs->connected) {
		err("%s: not connected", __func__);
	} else {
		atomic_set(&cs->hw.usb->busy, 0);
		tasklet_schedule(&cs->write_tasklet);
	}
	spin_unlock_irqrestore(&cs->lock, flags);
}

static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb)
{
	struct cmdbuf_t *tcb;
	unsigned long flags;
	int count;
	int status = -ENOENT; // FIXME
	struct usb_cardstate *ucs = cs->hw.usb;

	do {
		if (!cb->len) {
			tcb = cb;

			spin_lock_irqsave(&cs->cmdlock, flags);
			cs->cmdbytes -= cs->curlen;
			gig_dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
				cs->curlen, cs->cmdbytes);
			cs->cmdbuf = cb = cb->next;
			if (cb) {
				cb->prev = NULL;
				cs->curlen = cb->len;
			} else {
				cs->lastcmdbuf = NULL;
				cs->curlen = 0;
			}
			spin_unlock_irqrestore(&cs->cmdlock, flags);

			if (tcb->wake_tasklet)
				tasklet_schedule(tcb->wake_tasklet);
			kfree(tcb);
		}
		if (cb) {
			count = min(cb->len, ucs->bulk_out_size);
			gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);

			usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
					  usb_sndbulkpipe(ucs->udev,
					     ucs->bulk_out_endpointAddr & 0x0f),