diff options
Diffstat (limited to 'drivers/net/irda/mcs7780.c')
| -rw-r--r-- | drivers/net/irda/mcs7780.c | 977 |
1 files changed, 977 insertions, 0 deletions
diff --git a/drivers/net/irda/mcs7780.c b/drivers/net/irda/mcs7780.c new file mode 100644 index 000000000..bca6a1e72 --- /dev/null +++ b/drivers/net/irda/mcs7780.c @@ -0,0 +1,977 @@ +/***************************************************************************** +* +* Filename: mcs7780.c +* Version: 0.4-alpha +* Description: Irda MosChip USB Dongle Driver +* Authors: Lukasz Stelmach <stlman@poczta.fm> +* Brian Pugh <bpugh@cs.pdx.edu> +* Judy Fischbach <jfisch@cs.pdx.edu> +* +* Based on stir4200 driver, but some things done differently. +* Based on earlier driver by Paul Stewart <stewart@parc.com> +* +* Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at> +* Copyright (C) 2001, Dag Brattli <dag@brattli.net> +* Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com> +* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org> +* Copyright (C) 2005, Lukasz Stelmach <stlman@poczta.fm> +* Copyright (C) 2005, Brian Pugh <bpugh@cs.pdx.edu> +* Copyright (C) 2005, Judy Fischbach <jfisch@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. +* +*****************************************************************************/ + +/* + * MCS7780 is a simple USB to IrDA bridge by MosChip. It is neither + * compatibile with irda-usb nor with stir4200. Although it is quite + * similar to the later as far as general idea of operation is concerned. + * That is it requires the software to do all the framing job at SIR speeds. + * The hardware does take care of the framing at MIR and FIR speeds. + * It supports all speeds from 2400 through 4Mbps + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/usb.h> +#include <linux/device.h> +#include <linux/crc32.h> + +#include <asm/unaligned.h> +#include <asm/byteorder.h> +#include <asm/uaccess.h> + +#include <net/irda/irda.h> +#include <net/irda/wrapper.h> +#include <net/irda/crc.h> + +#include "mcs7780.h" + +#define MCS_VENDOR_ID 0x9710 +#define MCS_PRODUCT_ID 0x7780 + +static struct usb_device_id mcs_table[] = { + /* MosChip Corp., MCS7780 FIR-USB Adapter */ + {USB_DEVICE(MCS_VENDOR_ID, MCS_PRODUCT_ID)}, + {}, +}; + +MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>"); +MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780"); +MODULE_VERSION("0.3alpha"); +MODULE_LICENSE("GPL"); + +MODULE_DEVICE_TABLE(usb, mcs_table); + +static int qos_mtt_bits = 0x07 /* > 1ms */ ; +module_param(qos_mtt_bits, int, 0); +MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time"); + +static int receive_mode = 0x1; +module_param(receive_mode, int, 0); +MODULE_PARM_DESC(receive_mode, + "Receive mode of the device (1:fast, 0:slow, default:1)"); + +static int sir_tweak = 1; +module_param(sir_tweak, int, 0444); +MODULE_PARM_DESC(sir_tweak, + "Default pulse width (1:1.6us, 0:3/16 bit, default:1)."); + +static int transceiver_type = MCS_TSC_VISHAY; +module_param(transceiver_type, int, 0444); +MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h."); + +static struct usb_driver mcs_driver = { + .name = "mcs7780", + .probe = mcs_probe, + .disconnect = mcs_disconnect, + .id_table = mcs_table, +}; + +/* speed flag selection by direct addressing. +addr = (speed >> 8) & 0x0f + +0x1 57600 0x2 115200 0x4 1152000 0x5 9600 +0x6 38400 0x9 2400 0xa 576000 0xb 19200 + +4Mbps (or 2400) must be checked separately. Since it also has +to be programmed in a different manner that is not a big problem. +*/ +static __u16 mcs_speed_set[16] = { 0, + MCS_SPEED_57600, + MCS_SPEED_115200, + 0, + MCS_SPEED_1152000, + MCS_SPEED_9600, + MCS_SPEED_38400, + 0, 0, + MCS_SPEED_2400, + MCS_SPEED_576000, + MCS_SPEED_19200, + 0, 0, 0, +}; + +/* Set given 16 bit register with a 16 bit value. Send control message + * to set dongle register. */ +static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val) +{ + struct usb_device *dev = mcs->usbdev; + return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, + MCS_WR_RTYPE, val, reg, NULL, 0, + msecs_to_jiffies(MCS_CTRL_TIMEOUT)); +} + +/* Get 16 bit register value. Send contol message to read dongle register. */ +static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val) +{ + struct usb_device *dev = mcs->usbdev; + int ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, + MCS_RD_RTYPE, 0, reg, val, 2, + msecs_to_jiffies(MCS_CTRL_TIMEOUT)); + + return ret; +} + +/* Setup a communication between mcs7780 and TFDU chips. It is described + * in more detail in the data sheet. The setup sequence puts the the + * vishay tranceiver into high speed mode. It will also receive SIR speed + * packets but at reduced sensitivity. + */ + +/* 0: OK 1:ERROR */ +static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs) +{ + int ret = 0; + __u16 rval; + + /* mcs_get_reg should read exactly two bytes from the dongle */ + ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval); + if (unlikely(ret != 2)) { + ret = -EIO; + goto error; + } + + /* The MCS_XCVR_CONF bit puts the transceiver into configuration + * mode. The MCS_MODE0 bit must start out high (1) and then + * transition to low and the MCS_STFIR and MCS_MODE1 bits must + * be low. + */ + rval |= (MCS_MODE0 | MCS_XCVR_CONF); + rval &= ~MCS_STFIR; + rval &= ~MCS_MODE1; + ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); + if (unlikely(ret)) + goto error; + + rval &= ~MCS_MODE0; + ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); + if (unlikely(ret)) + goto error; + + rval &= ~MCS_XCVR_CONF; + ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); + if (unlikely(ret)) + goto error; + + ret = 0; +error: + return ret; +} + +/* Setup a communication between mcs7780 and agilent chip. */ +static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs) +{ + net_warn_ratelimited("This transceiver type is not supported yet\n"); + return 1; +} + +/* Setup a communication between mcs7780 and sharp chip. */ +static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs) +{ + net_warn_ratelimited("This transceiver type is not supported yet\n"); + return 1; +} + +/* Common setup for all transceivers */ +static inline int mcs_setup_transceiver(struct mcs_cb *mcs) +{ + int ret = 0; + __u16 rval; + const char *msg; + + msg = "Basic transceiver setup error"; + + /* read value of MODE Register, set the DRIVER and RESET bits + * and write value back out to MODE Register + */ + ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval); + if(unlikely(ret != 2)) + goto error; + rval |= MCS_DRIVER; /* put the mcs7780 into configuration mode. */ + ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); + if(unlikely(ret)) + goto error; + + rval = 0; /* set min pulse width to 0 initially. */ + ret = mcs_set_reg(mcs, MCS_MINRXPW_REG, rval); + if(unlikely(ret)) + goto error; + + ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval); + if(unlikely(ret != 2)) + goto error; + + rval &= ~MCS_FIR; /* turn off fir mode. */ + if(mcs->sir_tweak) + rval |= MCS_SIR16US; /* 1.6us pulse width */ + else + rval &= ~MCS_SIR16US; /* 3/16 bit time pulse width */ + + /* make sure ask mode and back to back packets are off. */ + rval &= ~(MCS_BBTG | MCS_ASK); + + rval &= ~MCS_SPEED_MASK; + rval |= MCS_SPEED_9600; /* make sure initial speed is 9600. */ + mcs->speed = 9600; + mcs->new_speed = 0; /* new_speed is set to 0 */ + rval &= ~MCS_PLLPWDN; /* disable power down. */ + + /* make sure device determines direction and that the auto send sip + * pulse are on. + */ + rval |= MCS_DTD | MCS_SIPEN; + + ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); + if(unlikely(ret)) + goto error; + + msg = "transceiver model specific setup error"; + switch (mcs->transceiver_type) { + case MCS_TSC_VISHAY: + ret = mcs_setup_transceiver_vishay(mcs); + break; + + case MCS_TSC_SHARP: + ret = mcs_setup_transceiver_sharp(mcs); + break; + + case MCS_TSC_AGILENT: + ret = mcs_setup_transceiver_agilent(mcs); + break; + + default: + net_warn_ratelimited("Unknown transceiver type: %d\n", + mcs->transceiver_type); + ret = 1; + } + if (unlikely(ret)) + goto error; + + /* If transceiver is not SHARP, then if receive mode set + * on the RXFAST bit in the XCVR Register otherwise unset it + */ + if (mcs->transceiver_type != MCS_TSC_SHARP) { + + ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval); + if (unlikely(ret != 2)) + goto error; + if (mcs->receive_mode) + rval |= MCS_RXFAST; + else + rval &= ~MCS_RXFAST; + ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); + if (unlikely(ret)) + goto error; + } + + msg = "transceiver reset"; + + ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval); + if (unlikely(ret != 2)) + goto error; + + /* reset the mcs7780 so all changes take effect. */ + rval &= ~MCS_RESET; + ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); + if (unlikely(ret)) + goto error; + else + return ret; + +error: + net_err_ratelimited("%s\n", msg); + return ret; +} + +/* Wraps the data in format for SIR */ +static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf) +{ + int wraplen; + + /* 2: full frame length, including "the length" */ + wraplen = async_wrap_skb(skb, buf + 2, 4094); + + wraplen += 2; + buf[0] = wraplen & 0xff; + buf[1] = (wraplen >> 8) & 0xff; + + return wraplen; +} + +/* Wraps the data in format for FIR */ +static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf) +{ + unsigned int len = 0; + __u32 fcs = ~(crc32_le(~0, skb->data, skb->len)); + + /* add 2 bytes for length value and 4 bytes for fcs. */ + len = skb->len + 6; + + /* The mcs7780 requires that the first two bytes are the packet + * length in little endian order. Note: the length value includes + * the two bytes for the length value itself. + */ + buf[0] = len & 0xff; + buf[1] = (len >> 8) & 0xff; + /* copy the data into the tx buffer. */ + skb_copy_from_linear_data(skb, buf + 2, skb->len); + /* put the fcs in the last four bytes in little endian order. */ + buf[len - 4] = fcs & 0xff; + buf[len - 3] = (fcs >> 8) & 0xff; + buf[len - 2] = (fcs >> 16) & 0xff; + buf[len - 1] = (fcs >> 24) & 0xff; + + return len; +} + +/* Wraps the data in format for MIR */ +static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf) +{ + __u16 fcs = 0; + int len = skb->len + 4; + + fcs = ~(irda_calc_crc16(~fcs, skb->data, skb->len)); + /* put the total packet length in first. Note: packet length + * value includes the two bytes that hold the packet length + * itself. + */ + buf[0] = len & 0xff; + buf[1] = (len >> 8) & 0xff; + /* copy the data */ + skb_copy_from_linear_data(skb, buf + 2, skb->len); + /* put the fcs in last two bytes in little endian order. */ + buf[len - 2] = fcs & 0xff; + buf[len - 1] = (fcs >> 8) & 0xff; + + return len; +} + +/* Unwrap received packets at MIR speed. A 16 bit crc_ccitt checksum is + * used for the fcs. When performed over the entire packet the result + * should be GOOD_FCS = 0xf0b8. Hands the unwrapped data off to the IrDA + * layer via a sk_buff. + */ +static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len) +{ + __u16 fcs; + int new_len; + struct sk_buff *skb; + + /* Assume that the frames are going to fill a single packet + * rather than span multiple packets. + */ + + new_len = len - 2; + if(unlikely(new_len <= 0)) { + net_err_ratelimited("%s short frame length %d\n", + mcs->netdev->name, new_len); + ++mcs->netdev->stats.rx_errors; + ++mcs->netdev->stats.rx_length_errors; + return; + } + fcs = 0; + fcs = irda_calc_crc16(~fcs, buf, len); + + if(fcs != GOOD_FCS) { + net_err_ratelimited("crc error calc 0x%x len %d\n", + fcs, new_len); + mcs->netdev->stats.rx_errors++; + mcs->netdev->stats.rx_crc_errors++; + return; + } + + skb = dev_alloc_skb(new_len + 1); + if(unlikely(!skb)) { + ++mcs->netdev->stats.rx_dropped; + return; + } + + skb_reserve(skb, 1); + skb_copy_to_linear_data(skb, buf, new_len); + skb_put(skb, new_len); + skb_reset_mac_header(skb); + skb->protocol = htons(ETH_P_IRDA); + skb->dev = mcs->netdev; + + netif_rx(skb); + + mcs->netdev->stats.rx_packets++; + mcs->netdev->stats.rx_bytes += new_len; +} + +/* Unwrap received packets at FIR speed. A 32 bit crc_ccitt checksum is + * used for the fcs. Hands the unwrapped data off to the IrDA + * layer via a sk_buff. + */ +static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len) +{ + __u32 fcs; + int new_len; + struct sk_buff *skb; + + /* Assume that the frames are going to fill a single packet + * rather than span multiple packets. This is most likely a false + * assumption. + */ + + new_len = len - 4; + if(unlikely(new_len <= 0)) { + net_err_ratelimited("%s short frame length %d\n", + mcs->netdev->name, new_len); + ++mcs->netdev->stats.rx_errors; + ++mcs->netdev->stats.rx_length_errors; + return; + } + + fcs = ~(crc32_le(~0, buf, new_len)); + if(fcs != get_unaligned_le32(buf + new_len)) { + net_err_ratelimited("crc error calc 0x%x len %d\n", + fcs, new_len); + mcs->netdev->stats.rx_errors++; + mcs->netdev->stats.rx_crc_errors++; + return; + } + + skb = dev_alloc_skb(new_len + 1); + if(unlikely(!skb)) { + ++mcs->netdev->stats.rx_dropped; + return; + } + + skb_reserve(skb, 1); + skb_copy_to_linear_data(skb, buf, new_len); + skb_put(skb, new_len); + skb_reset_mac_header(skb); + skb->protocol = htons(ETH_P_IRDA); + skb->dev = mcs->netdev; + + netif_rx(skb); + + mcs->netdev->stats.rx_packets++; + mcs->netdev->stats.rx_bytes += new_len; +} + + +/* Allocates urbs for both receive and transmit. + * If alloc fails return error code 0 (fail) otherwise + * return error code 1 (success). + */ +static inline int mcs_setup_urbs(struct mcs_cb *mcs) +{ + mcs->rx_urb = NULL; + + mcs->tx_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!mcs->tx_urb) + return 0; + + mcs->rx_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!mcs->rx_urb) { + usb_free_urb(mcs->tx_urb); + mcs->tx_urb = NULL; + return 0; + } + + return 1; +} + +/* Sets up state to be initially outside frame, gets receive urb, + * sets status to successful and then submits the urb to start + * receiving the data. + */ +static inline int mcs_receive_start(struct mcs_cb *mcs) +{ + mcs->rx_buff.in_frame = FALSE; + mcs->rx_buff.state = OUTSIDE_FRAME; + + usb_fill_bulk_urb(mcs->rx_urb, mcs->usbdev, + usb_rcvbulkpipe(mcs->usbdev, mcs->ep_in), + mcs->in_buf, 4096, mcs_receive_irq, mcs); + + mcs->rx_urb->status = 0; + return usb_submit_urb(mcs->rx_urb, GFP_KERNEL); +} + +/* Finds the in and out endpoints for the mcs control block */ +static inline int mcs_find_endpoints(struct mcs_cb *mcs, + struct usb_host_endpoint *ep, int epnum) +{ + int i; + int ret = 0; + + /* If no place to store the endpoints just return */ + if (!ep) + return ret; + + /* cycle through all endpoints, find the first two that are DIR_IN */ + for (i = 0; i < epnum; i++) { + if (ep[i].desc.bEndpointAddress & USB_DIR_IN) + mcs->ep_in = ep[i].desc.bEndpointAddress; + else + mcs->ep_out = ep[i].desc.bEndpointAddress; + + /* MosChip says that the chip has only two bulk + * endpoints. Find one for each direction and move on. + */ + if ((mcs->ep_in != 0) && (mcs->ep_out != 0)) { + ret = 1; + break; + } + } + + return ret; +} + +static void mcs_speed_work(struct work_struct *work) +{ + struct mcs_cb *mcs = container_of(work, struct mcs_cb, work); + struct net_device *netdev = mcs->netdev; + + mcs_speed_change(mcs); + netif_wake_queue(netdev); +} + +/* Function to change the speed of the mcs7780. Fully supports SIR, + * MIR, and FIR speeds. + */ +static int mcs_speed_change(struct mcs_cb *mcs) +{ + int ret = 0; + int rst = 0; + int cnt = 0; + __u16 nspeed; + __u16 rval; + + nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f]; + + do { + mcs_get_reg(mcs, MCS_RESV_REG, &rval); + } while(cnt++ < 100 && (rval & MCS_IRINTX)); + + if (cnt > 100) { + net_err_ratelimited("unable to change speed\n"); + ret = -EIO; + goto error; + } + + mcs_get_reg(mcs, MCS_MODE_REG, &rval); + + /* MINRXPW values recommended by MosChip */ + if (mcs->new_speed <= 115200) { + rval &= ~MCS_FIR; + + if ((rst = (mcs->speed > 115200))) + mcs_set_reg(mcs, MCS_MINRXPW_REG, 0); + + } else if (mcs->new_speed <= 1152000) { + rval &= ~MCS_FIR; + + if ((rst = !(mcs->speed == 576000 || mcs->speed == 1152000))) + mcs_set_reg(mcs, MCS_MINRXPW_REG, 5); + + } else { + rval |= MCS_FIR; + + if ((rst = (mcs->speed != 4000000))) + mcs_set_reg(mcs, MCS_MINRXPW_REG, 5); + + } + + rval &= ~MCS_SPEED_MASK; + rval |= nspeed; + + ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); + if (unlikely(ret)) + goto error; + + if (rst) + switch (mcs->transceiver_type) { + case MCS_TSC_VISHAY: + ret = mcs_setup_transceiver_vishay(mcs); + break; + + case MCS_TSC_SHARP: + ret = mcs_setup_transceiver_sharp(mcs); + break; + + case MCS_TSC_AGILENT: + ret = mcs_setup_transceiver_agilent(mcs); + break; + + default: + ret = 1; + net_warn_ratelimited("Unknown transceiver type: %d\n", + mcs->transceiver_type); + } + if (unlikely(ret)) + goto error; + + mcs_get_reg(mcs, MCS_MODE_REG, &rval); + rval &= ~MCS_RESET; + ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); + + mcs->speed = mcs->new_speed; +error: + mcs->new_speed = 0; + return ret; +} + +/* Ioctl calls not supported at this time. Can be an area of future work. */ +static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd) +{ + /* struct if_irda_req *irq = (struct if_irda_req *)rq; */ + /* struct mcs_cb *mcs = netdev_priv(netdev); */ + int ret = 0; + + switch (cmd) { + default: + ret = -EOPNOTSUPP; + } + + return ret; +} + +/* Network device is taken down, done by "ifconfig irda0 down" */ +static int mcs_net_close(struct net_device *netdev) +{ + int ret = 0; + struct mcs_cb *mcs = netdev_priv(netdev); + + /* Stop transmit processing */ + netif_stop_queue(netdev); + + kfree_skb(mcs->rx_buff.skb); + + /* kill and free the receive and transmit URBs */ + usb_kill_urb(mcs->rx_urb); + usb_free_urb(mcs->rx_urb); + usb_kill_urb(mcs->tx_urb); + usb_free_urb(mcs->tx_urb); + + /* Stop and remove instance of IrLAP */ + if (mcs->irlap) + irlap_close(mcs->irlap); + + mcs->irlap = NULL; + return ret; +} + +/* Network device is taken up, done by "ifconfig irda0 up" */ +static int mcs_net_open(struct net_device *netdev) +{ + struct mcs_cb *mcs = netdev_priv(netdev); + char hwname[16]; + int ret = 0; + + ret = usb_clear_halt(mcs->usbdev, + usb_sndbulkpipe(mcs->usbdev, mcs->ep_in)); + if (ret) + goto error1; + ret = usb_clear_halt(mcs->usbdev, + usb_rcvbulkpipe(mcs->usbdev, mcs->ep_out)); + if (ret) + goto error1; + + ret = mcs_setup_transceiver(mcs); + if (ret) + goto error1; + + ret = -ENOMEM; + + /* Initialize for SIR/FIR to copy data directly into skb. */ + mcs->receiving = 0; + mcs->rx_buff.truesize = IRDA_SKB_MAX_MTU; + mcs->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU); + if (!mcs->rx_buff.skb) + goto error1; + + skb_reserve(mcs->rx_buff.skb, 1); + mcs->rx_buff.head = mcs->rx_buff.skb->data; + + /* + * Now that everything should be initialized properly, + * Open new IrLAP layer instance to take care of us... + * Note : will send immediately a speed change... + */ + sprintf(hwname, "usb#%d", mcs->usbdev->devnum); + mcs->irlap = irlap_open(netdev, &mcs->qos, hwname); + if (!mcs->irlap) { + net_err_ratelimited("mcs7780: irlap_open failed\n"); + goto error2; + } + + if (!mcs_setup_urbs(mcs)) + goto error3; + + ret = mcs_receive_start(mcs); + if (ret) + goto error4; + + netif_start_queue(netdev); + return 0; + +error4: + usb_free_urb(mcs->rx_urb); + usb_free_urb(mcs->tx_urb); +error3: + irlap_close(mcs->irlap); +error2: + kfree_skb(mcs->rx_buff.skb); +error1: + return ret; +} + +/* Receive callback function. */ +static void mcs_receive_irq(struct urb *urb) +{ + __u8 *bytes; + struct mcs_cb *mcs = urb->context; + int i; + int ret; + + if (!netif_running(mcs->netdev)) + return; + + if (urb->status) + return; + + if (urb->actual_length > 0) { + bytes = urb->transfer_buffer; + + /* MCS returns frames without BOF and EOF + * I assume it returns whole frames. + */ + /* SIR speed */ + if(mcs->speed < 576000) { + async_unwrap_char(mcs->netdev, &mcs->netdev->stats, + &mcs->rx_buff, 0xc0); + + for (i = 0; i < urb->actual_length; i++) + async_unwrap_char(mcs->netdev, &mcs->netdev->stats, + &mcs->rx_buff, bytes[i]); + + async_unwrap_char(mcs->netdev, &mcs->netdev->stats, + &mcs->rx_buff, 0xc1); + } + /* MIR speed */ + else if(mcs->speed == 576000 || mcs->speed == 1152000) { + mcs_unwrap_mir(mcs, urb->transfer_buffer, + urb->actual_length); + } + /* FIR speed */ + else { + mcs_unwrap_fir(mcs, urb->transfer_buffer, + urb->actual_length); + } + } + + ret = usb_submit_urb(urb, GFP_ATOMIC); +} + +/* Transmit callback function. */ +static void mcs_send_irq(struct urb *urb) +{ + struct mcs_cb *mcs = urb->context; + struct net_device *ndev = mcs->netdev; + + if (unlikely(mcs->new_speed)) + schedule_work(&mcs->work); + else + netif_wake_queue(ndev); +} + +/* Transmit callback function. */ +static netdev_tx_t mcs_hard_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + unsigned long flags; + struct mcs_cb *mcs; + int wraplen; + int ret = 0; + + netif_stop_queue(ndev); + mcs = netdev_priv(ndev); + + spin_lock_irqsave(&mcs->lock, flags); + + mcs->new_speed = irda_get_next_speed(skb); + if (likely(mcs->new_speed == mcs->speed)) + mcs->new_speed = 0; + + /* SIR speed */ + if(mcs->speed < 576000) { + wraplen = mcs_wrap_sir_skb(skb, mcs->out_buf); + } + /* MIR speed */ + else if(mcs->speed == 576000 || mcs->speed == 1152000) { + wraplen = mcs_wrap_mir_skb(skb, mcs->out_buf); + } + /* FIR speed */ + else { + wraplen = mcs_wrap_fir_skb(skb, mcs->out_buf); + } + usb_fill_bulk_urb(mcs->tx_urb, mcs->usbdev, + usb_sndbulkpipe(mcs->usbdev, mcs->ep_out), + mcs->out_buf, wraplen, mcs_send_irq, mcs); + + if ((ret = usb_submit_urb(mcs->tx_urb, GFP_ATOMIC))) { + net_err_ratelimited("failed tx_urb: %d\n", ret); + switch (ret) { + case -ENODEV: + case -EPIPE: + break; + default: + mcs->netdev->stats.tx_errors++; + netif_start_queue(ndev); + } + } else { + mcs->netdev->stats.tx_packets++; + mcs->netdev->stats.tx_bytes += skb->len; + } + + dev_kfree_skb(skb); + spin_unlock_irqrestore(&mcs->lock, flags); + return NETDEV_TX_OK; +} + +static const struct net_device_ops mcs_netdev_ops = { + .ndo_open = mcs_net_open, + .ndo_stop = mcs_net_close, + .ndo_start_xmit = mcs_hard_xmit, + .ndo_do_ioctl = mcs_net_ioctl, +}; + +/* + * This function is called by the USB subsystem for each new device in the + * system. Need to verify the device and if it is, then start handling it. + */ +static int mcs_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(intf); + struct net_device *ndev = NULL; + struct mcs_cb *mcs; + int ret = -ENOMEM; + + ndev = alloc_irdadev(sizeof(*mcs)); + if (!ndev) + goto error1; + + pr_debug("MCS7780 USB-IrDA bridge found at %d.\n", udev->devnum); + + SET_NETDEV_DEV(ndev, &intf->dev); + + ret = usb_reset_configuration(udev); + if (ret != 0) { + net_err_ratelimited("mcs7780: usb reset configuration failed\n"); + goto error2; + } + + mcs = netdev_priv(ndev); + mcs->usbdev = udev; + mcs->netdev = ndev; + spin_lock_init(&mcs->lock); + + /* Initialize QoS for this device */ + irda_init_max_qos_capabilies(&mcs->qos); + + /* That's the Rx capability. */ + mcs->qos.baud_rate.bits &= + IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200 + | IR_576000 | IR_1152000 | (IR_4000000 << 8); + + + mcs->qos.min_turn_time.bits &= qos_mtt_bits; + irda_qos_bits_to_value(&mcs->qos); + + /* Speed change work initialisation*/ + INIT_WORK(&mcs->work, mcs_speed_work); + + ndev->netdev_ops = &mcs_netdev_ops; + + if (!intf->cur_altsetting) { + ret = -ENOMEM; + goto error2; + } + + ret = mcs_find_endpoints(mcs, intf->cur_altsetting->endpoint, + intf->cur_altsetting->desc.bNumEndpoints); + if (!ret) { + ret = -ENODEV; + goto error2; + } + + ret = register_netdev(ndev); + if (ret != 0) + goto error2; + + pr_debug("IrDA: Registered MosChip MCS7780 device as %s\n", + ndev->name); + + mcs->transceiver_type = transceiver_type; + mcs->sir_tweak = sir_tweak; + mcs->receive_mode = receive_mode; + + usb_set_intfdata(intf, mcs); + return 0; + +error2: + free_netdev(ndev); + +error1: + return ret; +} + +/* The current device is removed, the USB layer tells us to shut down. */ +static void mcs_disconnect(struct usb_interface *intf) +{ + struct mcs_cb *mcs = usb_get_intfdata(intf); + + if (!mcs) + return; + + cancel_work_sync(&mcs->work); + + unregister_netdev(mcs->netdev); + free_netdev(mcs->netdev); + + usb_set_intfdata(intf, NULL); + pr_debug("MCS7780 now disconnected.\n"); +} + +module_usb_driver(mcs_driver); |