diff options
Diffstat (limited to 'kernel/drivers/isdn/gigaset/i4l.c')
| -rw-r--r-- | kernel/drivers/isdn/gigaset/i4l.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/kernel/drivers/isdn/gigaset/i4l.c b/kernel/drivers/isdn/gigaset/i4l.c new file mode 100644 index 000000000..2d7532900 --- /dev/null +++ b/kernel/drivers/isdn/gigaset/i4l.c @@ -0,0 +1,695 @@ +/* + * Stuff used by all variants of the driver + * + * Copyright (c) 2001 by Stefan Eilers, + * Hansjoerg Lipp <hjlipp@web.de>, + * Tilman Schmidt <tilman@imap.cc>. + * + * ===================================================================== + * 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/isdnif.h> +#include <linux/export.h> + +#define SBUFSIZE 4096 /* sk_buff payload size */ +#define TRANSBUFSIZE 768 /* bytes per skb for transparent receive */ +#define HW_HDR_LEN 2 /* Header size used to store ack info */ +#define MAX_BUF_SIZE (SBUFSIZE - HW_HDR_LEN) /* max data packet from LL */ + +/* == Handling of I4L IO =====================================================*/ + +/* writebuf_from_LL + * called by LL to transmit data on an open channel + * inserts the buffer data into the send queue and starts the transmission + * Note that this operation must not sleep! + * When the buffer is processed completely, gigaset_skb_sent() should be called. + * parameters: + * driverID driver ID as assigned by LL + * channel channel number + * ack if != 0 LL wants to be notified on completion via + * statcallb(ISDN_STAT_BSENT) + * skb skb containing data to send + * return value: + * number of accepted bytes + * 0 if temporarily unable to accept data (out of buffer space) + * <0 on error (eg. -EINVAL) + */ +static int writebuf_from_LL(int driverID, int channel, int ack, + struct sk_buff *skb) +{ + struct cardstate *cs = gigaset_get_cs_by_id(driverID); + struct bc_state *bcs; + unsigned char *ack_header; + unsigned len; + + if (!cs) { + pr_err("%s: invalid driver ID (%d)\n", __func__, driverID); + return -ENODEV; + } + if (channel < 0 || channel >= cs->channels) { + dev_err(cs->dev, "%s: invalid channel ID (%d)\n", + __func__, channel); + return -ENODEV; + } + bcs = &cs->bcs[channel]; + + /* can only handle linear sk_buffs */ + if (skb_linearize(skb) < 0) { + dev_err(cs->dev, "%s: skb_linearize failed\n", __func__); + return -ENOMEM; + } + len = skb->len; + + gig_dbg(DEBUG_LLDATA, + "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)", + driverID, channel, ack, len); + + if (!len) { + if (ack) + dev_notice(cs->dev, "%s: not ACKing empty packet\n", + __func__); + return 0; + } + if (len > MAX_BUF_SIZE) { + dev_err(cs->dev, "%s: packet too large (%d bytes)\n", + __func__, len); + return -EINVAL; + } + + /* set up acknowledgement header */ + if (skb_headroom(skb) < HW_HDR_LEN) { + /* should never happen */ + dev_err(cs->dev, "%s: insufficient skb headroom\n", __func__); + return -ENOMEM; + } + skb_set_mac_header(skb, -HW_HDR_LEN); + skb->mac_len = HW_HDR_LEN; + ack_header = skb_mac_header(skb); + if (ack) { + ack_header[0] = len & 0xff; + ack_header[1] = len >> 8; + } else { + ack_header[0] = ack_header[1] = 0; + } + gig_dbg(DEBUG_MCMD, "skb: len=%u, ack=%d: %02x %02x", + len, ack, ack_header[0], ack_header[1]); + + /* pass to device-specific module */ + return cs->ops->send_skb(bcs, skb); +} + +/** + * gigaset_skb_sent() - acknowledge sending an skb + * @bcs: B channel descriptor structure. + * @skb: sent data. + * + * Called by hardware module {bas,ser,usb}_gigaset when the data in a + * skb has been successfully sent, for signalling completion to the LL. + */ +void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb) +{ + isdn_if *iif = bcs->cs->iif; + unsigned char *ack_header = skb_mac_header(skb); + unsigned len; + isdn_ctrl response; + + ++bcs->trans_up; + + if (skb->len) + dev_warn(bcs->cs->dev, "%s: skb->len==%d\n", + __func__, skb->len); + + len = ack_header[0] + ((unsigned) ack_header[1] << 8); + if (len) { + gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)", + bcs->cs->myid, bcs->channel, len); + + response.driver = bcs->cs->myid; + response.command = ISDN_STAT_BSENT; + response.arg = bcs->channel; + response.parm.length = len; + iif->statcallb(&response); + } +} +EXPORT_SYMBOL_GPL(gigaset_skb_sent); + +/** + * gigaset_skb_rcvd() - pass received skb to LL + * @bcs: B channel descriptor structure. + * @skb: received data. + * + * Called by hardware module {bas,ser,usb}_gigaset when user data has + * been successfully received, for passing to the LL. + * Warning: skb must not be accessed anymore! + */ +void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb) +{ + isdn_if *iif = bcs->cs->iif; + + iif->rcvcallb_skb(bcs->cs->myid, bcs->channel, skb); + bcs->trans_down++; +} +EXPORT_SYMBOL_GPL(gigaset_skb_rcvd); + +/** + * gigaset_isdn_rcv_err() - signal receive error + * @bcs: B channel descriptor structure. + * + * Called by hardware module {bas,ser,usb}_gigaset when a receive error + * has occurred, for signalling to the LL. + */ +void gigaset_isdn_rcv_err(struct bc_state *bcs) +{ + isdn_if *iif = bcs->cs->iif; + isdn_ctrl response; + + /* if currently ignoring packets, just count down */ + if (bcs->ignore) { + bcs->ignore--; + return; + } + + /* update statistics */ + bcs->corrupted++; + + /* error -> LL */ + gig_dbg(DEBUG_CMD, "sending L1ERR"); + response.driver = bcs->cs->myid; + response.command = ISDN_STAT_L1ERR; + response.arg = bcs->channel; + response.parm.errcode = ISDN_STAT_L1ERR_RECV; + iif->statcallb(&response); +} +EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err); + +/* This function will be called by LL to send commands + * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL, + * so don't put too much effort into it. + */ +static int command_from_LL(isdn_ctrl *cntrl) +{ + struct cardstate *cs; + struct bc_state *bcs; + int retval = 0; + char **commands; + int ch; + int i; + size_t l; + + gig_dbg(DEBUG_CMD, "driver: %d, command: %d, arg: 0x%lx", + cntrl->driver, cntrl->command, cntrl->arg); + + cs = gigaset_get_cs_by_id(cntrl->driver); + if (cs == NULL) { + pr_err("%s: invalid driver ID (%d)\n", __func__, cntrl->driver); + return -ENODEV; + } + ch = cntrl->arg & 0xff; + + switch (cntrl->command) { + case ISDN_CMD_IOCTL: + dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n"); + return -EINVAL; + + case ISDN_CMD_DIAL: + gig_dbg(DEBUG_CMD, + "ISDN_CMD_DIAL (phone: %s, msn: %s, si1: %d, si2: %d)", + cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn, + cntrl->parm.setup.si1, cntrl->parm.setup.si2); + + if (ch >= cs->channels) { + dev_err(cs->dev, + "ISDN_CMD_DIAL: invalid channel (%d)\n", ch); + return -EINVAL; + } + bcs = cs->bcs + ch; + if (gigaset_get_channel(bcs) < 0) { + dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n"); + return -EBUSY; + } + switch (bcs->proto2) { + case L2_HDLC: + bcs->rx_bufsize = SBUFSIZE; + break; + default: /* assume transparent */ + bcs->rx_bufsize = TRANSBUFSIZE; + } + dev_kfree_skb(bcs->rx_skb); + gigaset_new_rx_skb(bcs); + + commands = kzalloc(AT_NUM * (sizeof *commands), GFP_ATOMIC); + if (!commands) { + gigaset_free_channel(bcs); + dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n"); + return -ENOMEM; + } + + l = 3 + strlen(cntrl->parm.setup.phone); + commands[AT_DIAL] = kmalloc(l, GFP_ATOMIC); + if (!commands[AT_DIAL]) + goto oom; + if (cntrl->parm.setup.phone[0] == '*' && + cntrl->parm.setup.phone[1] == '*') { + /* internal call: translate ** prefix to CTP value */ + commands[AT_TYPE] = kstrdup("^SCTP=0\r", GFP_ATOMIC); + if (!commands[AT_TYPE]) + goto oom; + snprintf(commands[AT_DIAL], l, + "D%s\r", cntrl->parm.setup.phone + 2); + } else { + commands[AT_TYPE] = kstrdup("^SCTP=1\r", GFP_ATOMIC); + if (!commands[AT_TYPE]) + goto oom; + snprintf(commands[AT_DIAL], l, + "D%s\r", cntrl->parm.setup.phone); + } + + l = strlen(cntrl->parm.setup.eazmsn); + if (l) { + l += 8; + commands[AT_MSN] = kmalloc(l, GFP_ATOMIC); + if (!commands[AT_MSN]) + goto oom; + snprintf(commands[AT_MSN], l, "^SMSN=%s\r", + cntrl->parm.setup.eazmsn); + } + + switch (cntrl->parm.setup.si1) { + case 1: /* audio */ + /* BC = 9090A3: 3.1 kHz audio, A-law */ + commands[AT_BC] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC); + if (!commands[AT_BC]) + goto oom; + break; + case 7: /* data */ + default: /* hope the app knows what it is doing */ + /* BC = 8890: unrestricted digital information */ + commands[AT_BC] = kstrdup("^SBC=8890\r", GFP_ATOMIC); + if (!commands[AT_BC]) + goto oom; + } + /* ToDo: other si1 values, inspect si2, set HLC/LLC */ + + commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC); + if (!commands[AT_PROTO]) + goto oom; + snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2); + + commands[AT_ISO] = kmalloc(9, GFP_ATOMIC); + if (!commands[AT_ISO]) + goto oom; + snprintf(commands[AT_ISO], 9, "^SISO=%u\r", + (unsigned) bcs->channel + 1); + + if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands, + bcs->at_state.seq_index, NULL)) { + for (i = 0; i < AT_NUM; ++i) + kfree(commands[i]); + kfree(commands); + gigaset_free_channel(bcs); + return -ENOMEM; + } + gigaset_schedule_event(cs); + break; + case ISDN_CMD_ACCEPTD: + gig_dbg(DEBUG_CMD, "ISDN_CMD_ACCEPTD"); + if (ch >= cs->channels) { + dev_err(cs->dev, + "ISDN_CMD_ACCEPTD: invalid channel (%d)\n", ch); + return -EINVAL; + } + bcs = cs->bcs + ch; + switch (bcs->proto2) { + case L2_HDLC: + bcs->rx_bufsize = SBUFSIZE; + break; + default: /* assume transparent */ + bcs->rx_bufsize = TRANSBUFSIZE; + } + dev_kfree_skb(bcs->rx_skb); + gigaset_new_rx_skb(bcs); + if (!gigaset_add_event(cs, &bcs->at_state, + EV_ACCEPT, NULL, 0, NULL)) + return -ENOMEM; + gigaset_schedule_event(cs); + + break; + case ISDN_CMD_HANGUP: + gig_dbg(DEBUG_CMD, "ISDN_CMD_HANGUP"); + if (ch >= cs->channels) { + dev_err(cs->dev, + "ISDN_CMD_HANGUP: invalid channel (%d)\n", ch); + return -EINVAL; + } + bcs = cs->bcs + ch; + if (!gigaset_add_event(cs, &bcs->at_state, + EV_HUP, NULL, 0, NULL)) + return -ENOMEM; + gigaset_schedule_event(cs); + + break; + case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */ + dev_info(cs->dev, "ignoring ISDN_CMD_CLREAZ\n"); + break; + case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */ + dev_info(cs->dev, "ignoring ISDN_CMD_SETEAZ (%s)\n", + cntrl->parm.num); + break; + case ISDN_CMD_SETL2: /* Set L2 to given protocol */ + if (ch >= cs->channels) { + dev_err(cs->dev, + "ISDN_CMD_SETL2: invalid channel (%d)\n", ch); + return -EINVAL; + } + bcs = cs->bcs + ch; + if (bcs->chstate & CHS_D_UP) { + dev_err(cs->dev, + "ISDN_CMD_SETL2: channel active (%d)\n", ch); + return -EINVAL; + } + switch (cntrl->arg >> 8) { + case ISDN_PROTO_L2_HDLC: + gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_HDLC"); + bcs->proto2 = L2_HDLC; + break; + case ISDN_PROTO_L2_TRANS: + gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_VOICE"); + bcs->proto2 = L2_VOICE; + break; + default: + dev_err(cs->dev, + "ISDN_CMD_SETL2: unsupported protocol (%lu)\n", + cntrl->arg >> 8); + return -EINVAL; + } + break; + case ISDN_CMD_SETL3: /* Set L3 to given protocol */ + gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL3"); + if (ch >= cs->channels) { + dev_err(cs->dev, + "ISDN_CMD_SETL3: invalid channel (%d)\n", ch); + return -EINVAL; + } + + if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) { + dev_err(cs->dev, + "ISDN_CMD_SETL3: unsupported protocol (%lu)\n", + cntrl->arg >> 8); + return -EINVAL; + } + + break; + + default: + gig_dbg(DEBUG_CMD, "unknown command %d from LL", + cntrl->command); + return -EINVAL; + } + + return retval; + +oom: + dev_err(bcs->cs->dev, "out of memory\n"); + for (i = 0; i < AT_NUM; ++i) + kfree(commands[i]); + kfree(commands); + gigaset_free_channel(bcs); + return -ENOMEM; +} + +static void gigaset_i4l_cmd(struct cardstate *cs, int cmd) +{ + isdn_if *iif = cs->iif; + isdn_ctrl command; + + command.driver = cs->myid; + command.command = cmd; + command.arg = 0; + iif->statcallb(&command); +} + +static void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd) +{ + isdn_if *iif = bcs->cs->iif; + isdn_ctrl command; + + command.driver = bcs->cs->myid; + command.command = cmd; + command.arg = bcs->channel; + iif->statcallb(&command); +} + +/** + * gigaset_isdn_icall() - signal incoming call + * @at_state: connection state structure. + * + * Called by main module to notify the LL that an incoming call has been + * received. @at_state contains the parameters of the call. + * + * Return value: call disposition (ICALL_*) + */ +int gigaset_isdn_icall(struct at_state_t *at_state) +{ + struct cardstate *cs = at_state->cs; + struct bc_state *bcs = at_state->bcs; + isdn_if *iif = cs->iif; + isdn_ctrl response; + int retval; + + /* fill ICALL structure */ + response.parm.setup.si1 = 0; /* default: unknown */ + response.parm.setup.si2 = 0; + response.parm.setup.screen = 0; + response.parm.setup.plan = 0; + if (!at_state->str_var[STR_ZBC]) { + /* no BC (internal call): assume speech, A-law */ + response.parm.setup.si1 = 1; + } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) { + /* unrestricted digital information */ + response.parm.setup.si1 = 7; + } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) { + /* speech, A-law */ + response.parm.setup.si1 = 1; + } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) { + /* 3,1 kHz audio, A-law */ + response.parm.setup.si1 = 1; + response.parm.setup.si2 = 2; + } else { + dev_warn(cs->dev, "RING ignored - unsupported BC %s\n", + at_state->str_var[STR_ZBC]); + return ICALL_IGNORE; + } + if (at_state->str_var[STR_NMBR]) { + strlcpy(response.parm.setup.phone, at_state->str_var[STR_NMBR], + sizeof response.parm.setup.phone); + } else + response.parm.setup.phone[0] = 0; + if (at_state->str_var[STR_ZCPN]) { + strlcpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN], + sizeof response.parm.setup.eazmsn); + } else + response.parm.setup.eazmsn[0] = 0; + + if (!bcs) { + dev_notice(cs->dev, "no channel for incoming call\n"); + response.command = ISDN_STAT_ICALLW; + response.arg = 0; + } else { + gig_dbg(DEBUG_CMD, "Sending ICALL"); + response.command = ISDN_STAT_ICALL; + response.arg = bcs->channel; + } + response.driver = cs->myid; + retval = iif->statcallb(&response); + gig_dbg(DEBUG_CMD, "Response: %d", retval); + switch (retval) { + case 0: /* no takers */ + return ICALL_IGNORE; + case 1: /* alerting */ + bcs->chstate |= CHS_NOTIFY_LL; + return ICALL_ACCEPT; + case 2: /* reject */ + return ICALL_REJECT; + case 3: /* incomplete */ + dev_warn(cs->dev, + "LL requested unsupported feature: Incomplete Number\n"); + return ICALL_IGNORE; + case 4: /* proceeding */ + /* Gigaset will send ALERTING anyway. + * There doesn't seem to be a way to avoid this. + */ + return ICALL_ACCEPT; + case 5: /* deflect */ + dev_warn(cs->dev, + "LL requested unsupported feature: Call Deflection\n"); + return ICALL_IGNORE; + default: + dev_err(cs->dev, "LL error %d on ICALL\n", retval); + return ICALL_IGNORE; + } +} + +/** + * gigaset_isdn_connD() - signal D channel connect + * @bcs: B channel descriptor structure. + * + * Called by main module to notify the LL that the D channel connection has + * been established. + */ +void gigaset_isdn_connD(struct bc_state *bcs) +{ + gig_dbg(DEBUG_CMD, "sending DCONN"); + gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN); +} + +/** + * gigaset_isdn_hupD() - signal D channel hangup + * @bcs: B channel descriptor structure. + * + * Called by main module to notify the LL that the D channel connection has + * been shut down. + */ +void gigaset_isdn_hupD(struct bc_state *bcs) +{ + gig_dbg(DEBUG_CMD, "sending DHUP"); + gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP); +} + +/** + * gigaset_isdn_connB() - signal B channel connect + * @bcs: B channel descriptor structure. + * + * Called by main module to notify the LL that the B channel connection has + * been established. + */ +void gigaset_isdn_connB(struct bc_state *bcs) +{ + gig_dbg(DEBUG_CMD, "sending BCONN"); + gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN); +} + +/** + * gigaset_isdn_hupB() - signal B channel hangup + * @bcs: B channel descriptor structure. + * + * Called by main module to notify the LL that the B channel connection has + * been shut down. + */ +void gigaset_isdn_hupB(struct bc_state *bcs) +{ + gig_dbg(DEBUG_CMD, "sending BHUP"); + gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP); +} + +/** + * gigaset_isdn_start() - signal device availability + * @cs: device descriptor structure. + * + * Called by main module to notify the LL that the device is available for + * use. + */ +void gigaset_isdn_start(struct cardstate *cs) +{ + gig_dbg(DEBUG_CMD, "sending RUN"); + gigaset_i4l_cmd(cs, ISDN_STAT_RUN); +} + +/** + * gigaset_isdn_stop() - signal device unavailability + * @cs: device descriptor structure. + * + * Called by main module to notify the LL that the device is no longer + * available for use. + */ +void gigaset_isdn_stop(struct cardstate *cs) +{ + gig_dbg(DEBUG_CMD, "sending STOP"); + gigaset_i4l_cmd(cs, ISDN_STAT_STOP); +} + +/** + * gigaset_isdn_regdev() - register to LL + * @cs: device descriptor structure. + * @isdnid: device name. + * + * Return value: 0 on success, error code < 0 on failure + */ +int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid) +{ + isdn_if *iif; + + iif = kmalloc(sizeof *iif, GFP_KERNEL); + if (!iif) { + pr_err("out of memory\n"); + return -ENOMEM; + } + + if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index) + >= sizeof iif->id) { + pr_err("ID too long: %s\n", isdnid); + kfree(iif); + return -EINVAL; + } + + iif->owner = THIS_MODULE; + iif->channels = cs->channels; + iif->maxbufsize = MAX_BUF_SIZE; + iif->features = ISDN_FEATURE_L2_TRANS | + ISDN_FEATURE_L2_HDLC | + ISDN_FEATURE_L2_X75I | + ISDN_FEATURE_L3_TRANS | + ISDN_FEATURE_P_EURO; + iif->hl_hdrlen = HW_HDR_LEN; /* Area for storing ack */ + iif->command = command_from_LL; + iif->writebuf_skb = writebuf_from_LL; + iif->writecmd = NULL; /* Don't support isdnctrl */ + iif->readstat = NULL; /* Don't support isdnctrl */ + iif->rcvcallb_skb = NULL; /* Will be set by LL */ + iif->statcallb = NULL; /* Will be set by LL */ + + if (!register_isdn(iif)) { + pr_err("register_isdn failed\n"); + kfree(iif); + return -EINVAL; + } + + cs->iif = iif; + cs->myid = iif->channels; /* Set my device id */ + cs->hw_hdr_len = HW_HDR_LEN; + return 0; +} + +/** + * gigaset_isdn_unregdev() - unregister device from LL + * @cs: device descriptor structure. + */ +void gigaset_isdn_unregdev(struct cardstate *cs) +{ + gig_dbg(DEBUG_CMD, "sending UNLOAD"); + gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD); + kfree(cs->iif); + cs->iif = NULL; +} + +/** + * gigaset_isdn_regdrv() - register driver to LL + */ +void gigaset_isdn_regdrv(void) +{ + pr_info("ISDN4Linux interface\n"); + /* nothing to do */ +} + +/** + * gigaset_isdn_unregdrv() - unregister driver from LL + */ +void gigaset_isdn_unregdrv(void) +{ + /* nothing to do */ +} |