forked from Minki/linux
Merge branch 'gigaset_modem_response'
Tilman Schmidt says: ==================== isdn/gigaset: restructure modem response parser This series of patches restructures the Gigaset ISDN driver's modem response parser to improve code readability and conform better to the device's specification and actual behaviour. Could you please merge these through net-next? ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
c9231f8247
@ -389,22 +389,49 @@ zsau_resp[] =
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{NULL, ZSAU_UNKNOWN}
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};
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/* retrieve CID from parsed response
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* returns 0 if no CID, -1 if invalid CID, or CID value 1..65535
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/* check for and remove fixed string prefix
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* If s starts with prefix terminated by a non-alphanumeric character,
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* return pointer to the first character after that, otherwise return NULL.
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*/
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static int cid_of_response(char *s)
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static char *skip_prefix(char *s, const char *prefix)
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{
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int cid;
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int rc;
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while (*prefix)
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if (*s++ != *prefix++)
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return NULL;
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if (isalnum(*s))
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return NULL;
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return s;
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}
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if (s[-1] != ';')
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return 0; /* no CID separator */
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rc = kstrtoint(s, 10, &cid);
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if (rc)
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return 0; /* CID not numeric */
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if (cid < 1 || cid > 65535)
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return -1; /* CID out of range */
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return cid;
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/* queue event with CID */
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static void add_cid_event(struct cardstate *cs, int cid, int type,
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void *ptr, int parameter)
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{
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unsigned long flags;
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unsigned next, tail;
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struct event_t *event;
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gig_dbg(DEBUG_EVENT, "queueing event %d for cid %d", type, cid);
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spin_lock_irqsave(&cs->ev_lock, flags);
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tail = cs->ev_tail;
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next = (tail + 1) % MAX_EVENTS;
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if (unlikely(next == cs->ev_head)) {
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dev_err(cs->dev, "event queue full\n");
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kfree(ptr);
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} else {
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event = cs->events + tail;
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event->type = type;
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event->cid = cid;
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event->ptr = ptr;
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event->arg = NULL;
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event->parameter = parameter;
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event->at_state = NULL;
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cs->ev_tail = next;
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}
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spin_unlock_irqrestore(&cs->ev_lock, flags);
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}
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/**
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@ -417,190 +444,188 @@ static int cid_of_response(char *s)
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*/
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void gigaset_handle_modem_response(struct cardstate *cs)
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{
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unsigned char *argv[MAX_REC_PARAMS + 1];
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int params;
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int i, j;
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char *eoc, *psep, *ptr;
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const struct resp_type_t *rt;
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const struct zsau_resp_t *zr;
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int curarg;
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unsigned long flags;
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unsigned next, tail, head;
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struct event_t *event;
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int resp_code;
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int param_type;
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int abort;
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size_t len;
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int cid;
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int rawstring;
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int cid, parameter;
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u8 type, value;
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len = cs->cbytes;
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if (!len) {
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if (!cs->cbytes) {
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/* ignore additional LFs/CRs (M10x config mode or cx100) */
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gig_dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[0]);
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return;
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}
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cs->respdata[len] = 0;
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argv[0] = cs->respdata;
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params = 1;
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cs->respdata[cs->cbytes] = 0;
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if (cs->at_state.getstring) {
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/* getstring only allowed without cid at the moment */
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/* state machine wants next line verbatim */
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cs->at_state.getstring = 0;
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rawstring = 1;
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cid = 0;
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ptr = kstrdup(cs->respdata, GFP_ATOMIC);
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gig_dbg(DEBUG_EVENT, "string==%s", ptr ? ptr : "NULL");
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add_cid_event(cs, 0, RSP_STRING, ptr, 0);
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return;
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}
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/* look up response type */
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for (rt = resp_type; rt->response; ++rt) {
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eoc = skip_prefix(cs->respdata, rt->response);
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if (eoc)
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break;
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}
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if (!rt->response) {
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add_cid_event(cs, 0, RSP_NONE, NULL, 0);
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gig_dbg(DEBUG_EVENT, "unknown modem response: '%s'\n",
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cs->respdata);
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return;
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}
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/* check for CID */
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psep = strrchr(cs->respdata, ';');
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if (psep &&
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!kstrtoint(psep + 1, 10, &cid) &&
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cid >= 1 && cid <= 65535) {
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/* valid CID: chop it off */
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*psep = 0;
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} else {
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/* parse line */
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for (i = 0; i < len; i++)
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switch (cs->respdata[i]) {
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case ';':
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case ',':
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case '=':
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if (params > MAX_REC_PARAMS) {
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dev_warn(cs->dev,
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"too many parameters in response\n");
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/* need last parameter (might be CID) */
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params--;
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}
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argv[params++] = cs->respdata + i + 1;
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}
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rawstring = 0;
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cid = params > 1 ? cid_of_response(argv[params - 1]) : 0;
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if (cid < 0) {
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gigaset_add_event(cs, &cs->at_state, RSP_INVAL,
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NULL, 0, NULL);
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return;
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}
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for (j = 1; j < params; ++j)
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argv[j][-1] = 0;
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gig_dbg(DEBUG_EVENT, "CMD received: %s", argv[0]);
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if (cid) {
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--params;
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gig_dbg(DEBUG_EVENT, "CID: %s", argv[params]);
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}
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gig_dbg(DEBUG_EVENT, "available params: %d", params - 1);
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for (j = 1; j < params; j++)
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gig_dbg(DEBUG_EVENT, "param %d: %s", j, argv[j]);
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/* no valid CID: leave unchanged */
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cid = 0;
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}
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spin_lock_irqsave(&cs->ev_lock, flags);
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head = cs->ev_head;
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tail = cs->ev_tail;
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gig_dbg(DEBUG_EVENT, "CMD received: %s", cs->respdata);
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if (cid)
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gig_dbg(DEBUG_EVENT, "CID: %d", cid);
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abort = 1;
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curarg = 0;
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while (curarg < params) {
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next = (tail + 1) % MAX_EVENTS;
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if (unlikely(next == head)) {
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dev_err(cs->dev, "event queue full\n");
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break;
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}
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switch (rt->type) {
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case RT_NOTHING:
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/* check parameter separator */
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if (*eoc)
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goto bad_param; /* extra parameter */
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event = cs->events + tail;
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event->at_state = NULL;
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event->cid = cid;
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event->ptr = NULL;
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event->arg = NULL;
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tail = next;
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add_cid_event(cs, cid, rt->resp_code, NULL, 0);
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break;
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if (rawstring) {
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resp_code = RSP_STRING;
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param_type = RT_STRING;
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} else {
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for (rt = resp_type; rt->response; ++rt)
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if (!strcmp(argv[curarg], rt->response))
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case RT_RING:
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/* check parameter separator */
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if (!*eoc)
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eoc = NULL; /* no parameter */
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else if (*eoc++ != ',')
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goto bad_param;
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add_cid_event(cs, 0, rt->resp_code, NULL, cid);
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/* process parameters as individual responses */
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while (eoc) {
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/* look up parameter type */
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psep = NULL;
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for (rt = resp_type; rt->response; ++rt) {
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psep = skip_prefix(eoc, rt->response);
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if (psep)
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break;
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if (!rt->response) {
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event->type = RSP_NONE;
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gig_dbg(DEBUG_EVENT,
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"unknown modem response: '%s'\n",
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argv[curarg]);
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break;
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}
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resp_code = rt->resp_code;
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param_type = rt->type;
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++curarg;
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}
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event->type = resp_code;
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switch (param_type) {
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case RT_NOTHING:
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break;
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case RT_RING:
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if (!cid) {
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dev_err(cs->dev,
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"received RING without CID!\n");
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event->type = RSP_INVAL;
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abort = 1;
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} else {
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event->cid = 0;
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event->parameter = cid;
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abort = 0;
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}
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break;
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case RT_ZSAU:
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if (curarg >= params) {
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event->parameter = ZSAU_NONE;
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break;
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}
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for (zr = zsau_resp; zr->str; ++zr)
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if (!strcmp(argv[curarg], zr->str))
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break;
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event->parameter = zr->code;
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if (!zr->str)
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/* all legal parameters are of type RT_STRING */
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if (!psep || rt->type != RT_STRING) {
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dev_warn(cs->dev,
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"%s: unknown parameter %s after ZSAU\n",
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__func__, argv[curarg]);
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++curarg;
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break;
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case RT_STRING:
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if (curarg < params) {
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event->ptr = kstrdup(argv[curarg], GFP_ATOMIC);
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if (!event->ptr)
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dev_err(cs->dev, "out of memory\n");
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++curarg;
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"illegal RING parameter: '%s'\n",
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eoc);
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return;
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}
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gig_dbg(DEBUG_EVENT, "string==%s",
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event->ptr ? (char *) event->ptr : "NULL");
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break;
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case RT_ZCAU:
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event->parameter = -1;
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if (curarg + 1 < params) {
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u8 type, value;
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i = kstrtou8(argv[curarg++], 16, &type);
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j = kstrtou8(argv[curarg++], 16, &value);
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if (i == 0 && j == 0)
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event->parameter = (type << 8) | value;
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} else
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curarg = params - 1;
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break;
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case RT_NUMBER:
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if (curarg >= params ||
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kstrtoint(argv[curarg++], 10, &event->parameter))
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event->parameter = -1;
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gig_dbg(DEBUG_EVENT, "parameter==%d", event->parameter);
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/* skip parameter value separator */
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if (*psep++ != '=')
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goto bad_param;
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/* look up end of parameter */
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eoc = strchr(psep, ',');
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if (eoc)
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*eoc++ = 0;
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/* retrieve parameter value */
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ptr = kstrdup(psep, GFP_ATOMIC);
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/* queue event */
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add_cid_event(cs, cid, rt->resp_code, ptr, 0);
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}
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break;
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case RT_ZSAU:
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/* check parameter separator */
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if (!*eoc) {
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/* no parameter */
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add_cid_event(cs, cid, rt->resp_code, NULL, ZSAU_NONE);
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break;
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}
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if (*eoc++ != '=')
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goto bad_param;
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if (resp_code == RSP_ZDLE)
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cs->dle = event->parameter;
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/* look up parameter value */
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for (zr = zsau_resp; zr->str; ++zr)
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if (!strcmp(eoc, zr->str))
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break;
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if (!zr->str)
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goto bad_param;
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if (abort)
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break;
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add_cid_event(cs, cid, rt->resp_code, NULL, zr->code);
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break;
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case RT_STRING:
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/* check parameter separator */
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if (*eoc++ != '=')
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goto bad_param;
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/* retrieve parameter value */
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ptr = kstrdup(eoc, GFP_ATOMIC);
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/* queue event */
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add_cid_event(cs, cid, rt->resp_code, ptr, 0);
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break;
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case RT_ZCAU:
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/* check parameter separators */
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if (*eoc++ != '=')
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goto bad_param;
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psep = strchr(eoc, ',');
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if (!psep)
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goto bad_param;
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*psep++ = 0;
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/* decode parameter values */
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if (kstrtou8(eoc, 16, &type) || kstrtou8(psep, 16, &value)) {
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*--psep = ',';
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goto bad_param;
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}
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parameter = (type << 8) | value;
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add_cid_event(cs, cid, rt->resp_code, NULL, parameter);
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break;
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case RT_NUMBER:
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/* check parameter separator */
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if (*eoc++ != '=')
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goto bad_param;
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/* decode parameter value */
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if (kstrtoint(eoc, 10, ¶meter))
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goto bad_param;
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/* special case ZDLE: set flag before queueing event */
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if (rt->resp_code == RSP_ZDLE)
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cs->dle = parameter;
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add_cid_event(cs, cid, rt->resp_code, NULL, parameter);
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break;
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bad_param:
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/* parameter unexpected, incomplete or malformed */
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dev_warn(cs->dev, "bad parameter in response '%s'\n",
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cs->respdata);
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add_cid_event(cs, cid, rt->resp_code, NULL, -1);
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break;
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default:
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dev_err(cs->dev, "%s: internal error on '%s'\n",
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__func__, cs->respdata);
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}
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cs->ev_tail = tail;
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spin_unlock_irqrestore(&cs->ev_lock, flags);
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if (curarg != params)
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gig_dbg(DEBUG_EVENT,
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"invalid number of processed parameters: %d/%d",
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curarg, params);
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}
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EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
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