[IRDA]: Initial support for MCS7780 based dongles

The MosChip MCS7780 chipset is an IrDA USB bridge that
doesn't conform with the IrDA-USB standard and thus needs
its separate driver.
Tested on an actual MCS7780 based dongle.

Original implementation by Brian Pugh <bpugh@cs.pdx.edu>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/irda/Kconfig

@@ -417,5 +417,20 @@ config PXA_FICP
 	  available capabilities may vary from one PXA2xx target to
 	  another.
 
+config MCS_FIR
+	tristate "MosChip MCS7780 IrDA-USB dongle"
+	depends on IRDA && USB && EXPERIMENTAL
+	help
+	  Say Y or M here if you want to build support for the MosChip
+	  MCS7780 IrDA-USB bridge device driver.
+
+	  USB bridge based on the MosChip MCS7780 don't conform to the
+	  IrDA-USB device class specification, and therefore need their
+	  own specific driver. Those dongles support SIR and FIR (4Mbps)
+	  speeds.
+
+	  To compile it as a module, choose M here: the module will be called
+	  mcs7780.
+
 endmenu
 

drivers/net/irda/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_ALI_FIR)		+= ali-ircc.o
 obj-$(CONFIG_VLSI_FIR)		+= vlsi_ir.o
 obj-$(CONFIG_VIA_FIR)		+= via-ircc.o
 obj-$(CONFIG_PXA_FICP)	        += pxaficp_ir.o
+obj-$(CONFIG_MCS_FIR)	        += mcs7780.o
 # Old dongle drivers for old SIR drivers
 obj-$(CONFIG_ESI_DONGLE_OLD)		+= esi.o
 obj-$(CONFIG_TEKRAM_DONGLE_OLD)	+= tekram.o

drivers/net/irda/mcs7780.h

+/*****************************************************************************
+*
+* Filename:      mcs7780.h
+* Version:       0.2-alpha
+* Description:   Irda MosChip USB Dongle
+* Status:        Experimental
+* Authors:       Lukasz Stelmach <stlman@poczta.fm>
+*		 Brian Pugh <bpugh@cs.pdx.edu>
+*
+*       Copyright (C) 2005, Lukasz Stelmach <stlman@poczta.fm>
+*       Copyright (C) 2005, Brian Pugh <bpugh@cs.pdx.edu>
+*
+*       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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*
+*****************************************************************************/
+#ifndef _MCS7780_H
+#define _MCS7780_H
+
+#define MCS_MODE_SIR		0
+#define MCS_MODE_MIR		1
+#define MCS_MODE_FIR		2
+
+#define MCS_CTRL_TIMEOUT	500
+#define MCS_XMIT_TIMEOUT	500
+/* Possible transceiver types */
+#define MCS_TSC_VISHAY		0	/* Vishay TFD, default choice */
+#define MCS_TSC_AGILENT		1	/* Agilent 3602/3600 */
+#define MCS_TSC_SHARP		2	/* Sharp GP2W1000YP */
+
+/* Requests */
+#define MCS_RD_RTYPE 0xC0
+#define MCS_WR_RTYPE 0x40
+#define MCS_RDREQ    0x0F
+#define MCS_WRREQ    0x0E
+
+/* Register 0x00 */
+#define MCS_MODE_REG	0
+#define MCS_FIR		((__u16)0x0001)
+#define MCS_SIR16US	((__u16)0x0002)
+#define MCS_BBTG	((__u16)0x0004)
+#define MCS_ASK		((__u16)0x0008)
+#define MCS_PARITY	((__u16)0x0010)
+
+/* SIR/MIR speed constants */
+#define MCS_SPEED_SHIFT	    5
+#define MCS_SPEED_MASK	    ((__u16)0x00E0)
+#define MCS_SPEED(x)	    ((x & MCS_SPEED_MASK) >> MCS_SPEED_SHIFT)
+#define MCS_SPEED_2400	    ((0 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+#define MCS_SPEED_9600	    ((1 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+#define MCS_SPEED_19200	    ((2 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+#define MCS_SPEED_38400	    ((3 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+#define MCS_SPEED_57600	    ((4 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+#define MCS_SPEED_115200    ((5 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+#define MCS_SPEED_576000    ((6 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+#define MCS_SPEED_1152000   ((7 << MCS_SPEED_SHIFT) & MCS_SPEED_MASK)
+
+#define MCS_PLLPWDN	((__u16)0x0100)
+#define MCS_DRIVER	((__u16)0x0200)
+#define MCS_DTD		((__u16)0x0400)
+#define MCS_DIR		((__u16)0x0800)
+#define MCS_SIPEN	((__u16)0x1000)
+#define MCS_SENDSIP	((__u16)0x2000)
+#define MCS_CHGDIR	((__u16)0x4000)
+#define MCS_RESET	((__u16)0x8000)
+
+/* Register 0x02 */
+#define MCS_XCVR_REG	2
+#define MCS_MODE0	((__u16)0x0001)
+#define MCS_STFIR	((__u16)0x0002)
+#define MCS_XCVR_CONF	((__u16)0x0004)
+#define MCS_RXFAST	((__u16)0x0008)
+/* TXCUR [6:4] */
+#define MCS_TXCUR_SHIFT	4
+#define MCS_TXCUR_MASK	((__u16)0x0070)
+#define MCS_TXCUR(x)	((x & MCS_TXCUR_MASK) >> MCS_TXCUR_SHIFT)
+#define MCS_SETTXCUR(x,y) \
+	((x & ~MCS_TXCUR_MASK) | (y << MCS_TXCUR_SHIFT) & MCS_TXCUR_MASK)
+
+#define MCS_MODE1	((__u16)0x0080)
+#define MCS_SMODE0	((__u16)0x0100)
+#define MCS_SMODE1	((__u16)0x0200)
+#define MCS_INVTX	((__u16)0x0400)
+#define MCS_INVRX	((__u16)0x0800)
+
+#define MCS_MINRXPW_REG	4
+
+#define MCS_RESV_REG 7
+#define MCS_IRINTX	((__u16)0x0001)
+#define MCS_IRINRX	((__u16)0x0002)
+
+struct mcs_cb {
+	struct usb_device *usbdev;	/* init: probe_irda */
+	struct net_device *netdev;	/* network layer */
+	struct irlap_cb *irlap;	/* The link layer we are binded to */
+	struct net_device_stats stats;	/* network statistics */
+	struct qos_info qos;
+	unsigned int speed;	/* Current speed */
+	unsigned int new_speed;	/* new speed */
+
+	struct work_struct work; /* Change speed work */
+
+	struct sk_buff *tx_pending;
+	char in_buf[4096];	/* transmit/receive buffer */
+	char out_buf[4096];	/* transmit/receive buffer */
+	__u8 *fifo_status;
+
+	iobuff_t rx_buff;	/* receive unwrap state machine */
+	struct timeval rx_time;
+	spinlock_t lock;
+	int receiving;
+
+	__u8 ep_in;
+	__u8 ep_out;
+
+	struct urb *rx_urb;
+	struct urb *tx_urb;
+
+	int transceiver_type;
+	int sir_tweak;
+	int receive_mode;
+};
+
+static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val);
+static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val);
+
+static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs);
+static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs);
+static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs);
+static inline int mcs_setup_transceiver(struct mcs_cb *mcs);
+static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf);
+static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf);
+static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf);
+static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len);
+static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len);
+static inline int mcs_setup_urbs(struct mcs_cb *mcs);
+static inline int mcs_receive_start(struct mcs_cb *mcs);
+static inline int mcs_find_endpoints(struct mcs_cb *mcs,
+				     struct usb_host_endpoint *ep, int epnum);
+
+static int mcs_speed_change(struct mcs_cb *mcs);
+
+static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd);
+static int mcs_net_close(struct net_device *netdev);
+static int mcs_net_open(struct net_device *netdev);
+static struct net_device_stats *mcs_net_get_stats(struct net_device *netdev);
+
+static void mcs_receive_irq(struct urb *urb, struct pt_regs *regs);
+static void mcs_send_irq(struct urb *urb, struct pt_regs *regs);
+static int mcs_hard_xmit(struct sk_buff *skb, struct net_device *netdev);
+
+static int mcs_probe(struct usb_interface *intf,
+		     const struct usb_device_id *id);
+static void mcs_disconnect(struct usb_interface *intf);
+
+#endif				/* _MCS7780_H */