/********************************************************************* * * Filename: ircomm_param.c * Version: 1.0 * Description: Parameter handling for the IrCOMM protocol * Status: Experimental. * Author: Dag Brattli <dagb@cs.uit.no> * Created at: Mon Jun 7 10:25:11 1999 * Modified at: Sun Jan 30 14:32:03 2000 * Modified by: Dag Brattli <dagb@cs.uit.no> * * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. * * 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., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * ********************************************************************/ #include <linux/workqueue.h> #include <linux/interrupt.h> #include <net/irda/irda.h> #include <net/irda/parameters.h> #include <net/irda/ircomm_core.h> #include <net/irda/ircomm_tty_attach.h> #include <net/irda/ircomm_tty.h> #include <net/irda/ircomm_param.h> static int ircomm_param_service_type(void *instance, irda_param_t *param, int get); static int ircomm_param_port_type(void *instance, irda_param_t *param, int get); static int ircomm_param_port_name(void *instance, irda_param_t *param, int get); static int ircomm_param_service_type(void *instance, irda_param_t *param, int get); static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get); static int ircomm_param_data_format(void *instance, irda_param_t *param, int get); static int ircomm_param_flow_control(void *instance, irda_param_t *param, int get); static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get); static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get); static int ircomm_param_line_status(void *instance, irda_param_t *param, int get); static int ircomm_param_dte(void *instance, irda_param_t *param, int get); static int ircomm_param_dce(void *instance, irda_param_t *param, int get); static int ircomm_param_poll(void *instance, irda_param_t *param, int get); static pi_minor_info_t pi_minor_call_table_common[] = { { ircomm_param_service_type, PV_INT_8_BITS }, { ircomm_param_port_type, PV_INT_8_BITS }, { ircomm_param_port_name, PV_STRING } }; static pi_minor_info_t pi_minor_call_table_non_raw[] = { { ircomm_param_data_rate, PV_INT_32_BITS | PV_BIG_ENDIAN }, { ircomm_param_data_format, PV_INT_8_BITS }, { ircomm_param_flow_control, PV_INT_8_BITS }, { ircomm_param_xon_xoff, PV_INT_16_BITS }, { ircomm_param_enq_ack, PV_INT_16_BITS }, { ircomm_param_line_status, PV_INT_8_BITS } }; static pi_minor_info_t pi_minor_call_table_9_wire[] = { { ircomm_param_dte, PV_INT_8_BITS }, { ircomm_param_dce, PV_INT_8_BITS }, { ircomm_param_poll, PV_NO_VALUE }, }; static pi_major_info_t pi_major_call_table[] = { { pi_minor_call_table_common, 3 }, { pi_minor_call_table_non_raw, 6 }, { pi_minor_call_table_9_wire, 3 } /* { pi_minor_call_table_centronics } */ }; pi_param_info_t ircomm_param_info = { pi_major_call_table, 3, 0x0f, 4 }; /* * Function ircomm_param_request (self, pi, flush) * * Queue a parameter for the control channel * */ int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush) { struct tty_struct *tty; unsigned long flags; struct sk_buff *skb; int count; IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); tty = self->tty; if (!tty) return 0; /* Make sure we don't send parameters for raw mode */ if (self->service_type == IRCOMM_3_WIRE_RAW) return 0; spin_lock_irqsave(&self->spinlock, flags); skb = self->ctrl_skb; if (!skb) { skb = alloc_skb(256, GFP_ATOMIC); if (!skb) { spin_unlock_irqrestore(&self->spinlock, flags); return -ENOMEM; } skb_reserve(skb, self->max_header_size); self->ctrl_skb = skb; } /* * Inserting is a little bit tricky since we don't know how much * room we will need. But this should hopefully work OK */ count = irda_param_insert(self, pi, skb_tail_pointer(skb), skb_tailroom(skb), &ircomm_param_info); if (count < 0) { IRDA_WARNING("%s(), no room for parameter!\n", __FUNCTION__); spin_unlock_irqrestore(&self->spinlock, flags); return -1; } skb_put(skb, count); spin_unlock_irqrestore(&self->spinlock, flags); IRDA_DEBUG(2, "%s(), skb->len=%d\n", __FUNCTION__ , skb->len); if (flush) { /* ircomm_tty_do_softint will take care of the rest */ schedule_work(&self->tqueue); } return count; } /* * Function ircomm_param_service_type (self, buf, len) * * Handle service type, this function will both be called after the LM-IAS * query and then the remote device sends its initial parameters * */ static int ircomm_param_service_type(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; __u8 service_type = (__u8) param->pv.i; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) { param->pv.i = self->settings.service_type; return 0; } /* Find all common service types */ service_type &= self->service_type; if (!service_type) { IRDA_DEBUG(2, "%s(), No common service type to use!\n", __FUNCTION__ ); return -1; } IRDA_DEBUG(0, "%s(), services in common=%02x\n", __FUNCTION__ , service_type); /* * Now choose a preferred service type of those available */ if (service_type & IRCOMM_CENTRONICS) self->settings.service_type = IRCOMM_CENTRONICS; else if (service_type & IRCOMM_9_WIRE) self->settings.service_type = IRCOMM_9_WIRE; else if (service_type & IRCOMM_3_WIRE) self->settings.service_type = IRCOMM_3_WIRE; else if (service_type & IRCOMM_3_WIRE_RAW) self->settings.service_type = IRCOMM_3_WIRE_RAW; IRDA_DEBUG(0, "%s(), resulting service type=0x%02x\n", __FUNCTION__ , self->settings.service_type); /* * Now the line is ready for some communication. Check if we are a * server, and send over some initial parameters. * Client do it in ircomm_tty_state_setup(). * Note : we may get called from ircomm_tty_getvalue_confirm(), * therefore before we even have open any socket. And self->client * is initialised to TRUE only later. So, we check if the link is * really initialised. - Jean II */ if ((self->max_header_size != IRCOMM_TTY_HDR_UNINITIALISED) && (!self->client) && (self->settings.service_type != IRCOMM_3_WIRE_RAW)) { /* Init connection */ ircomm_tty_send_initial_parameters(self); ircomm_tty_link_established(self); } return 0; } /* * Function ircomm_param_port_type (self, param) * * The port type parameter tells if the devices are serial or parallel. * Since we only advertise serial service, this parameter should only * be equal to IRCOMM_SERIAL. */ static int ircomm_param_port_type(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) param->pv.i = IRCOMM_SERIAL; else { self->settings.port_type = (__u8) param->pv.i; IRDA_DEBUG(0, "%s(), port type=%d\n", __FUNCTION__ , self->settings.port_type); } return 0; } /* * Function ircomm_param_port_name (self, param) * * Exchange port name * */ static int ircomm_param_port_name(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) { IRDA_DEBUG(0, "%s(), not imp!\n", __FUNCTION__ ); } else { IRDA_DEBUG(0, "%s(), port-name=%s\n", __FUNCTION__ , param->pv.c); strncpy(self->settings.port_name, param->pv.c, 32); } return 0; } /* * Function ircomm_param_data_rate (self, param) * * Exchange data rate to be used in this settings * */ static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) param->pv.i = self->settings.data_rate; else self->settings.data_rate = param->pv.i; IRDA_DEBUG(2, "%s(), data rate = %d\n", __FUNCTION__ , param->pv.i); return 0; } /* * Function ircomm_param_data_format (self, param) * * Exchange data format to be used in this settings * */ static int ircomm_param_data_format(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) param->pv.i = self->settings.data_format; else self->settings.data_format = (__u8) param->pv.i; return 0; } /* * Function ircomm_param_flow_control (self, param) * * Exchange flow control settings to be used in this settings * */ static int ircomm_param_flow_control(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) param->pv.i = self->settings.flow_control; else self->settings.flow_control = (__u8) param->pv.i; IRDA_DEBUG(1, "%s(), flow control = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i); return 0; } /* * Function ircomm_param_xon_xoff (self, param) * * Exchange XON/XOFF characters * */ static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) { param->pv.i = self->settings.xonxoff[0]; param->pv.i |= self->settings.xonxoff[1] << 8; } else { self->settings.xonxoff[0] = (__u16) param->pv.i & 0xff; self->settings.xonxoff[1] = (__u16) param->pv.i >> 8; } IRDA_DEBUG(0, "%s(), XON/XOFF = 0x%02x,0x%02x\n", __FUNCTION__ , param->pv.i & 0xff, param->pv.i >> 8); return 0; } /* * Function ircomm_param_enq_ack (self, param) * * Exchange ENQ/ACK characters * */ static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) { param->pv.i = self->settings.enqack[0]; param->pv.i |= self->settings.enqack[1] << 8; } else { self->settings.enqack[0] = (__u16) param->pv.i & 0xff; self->settings.enqack[1] = (__u16) param->pv.i >> 8; } IRDA_DEBUG(0, "%s(), ENQ/ACK = 0x%02x,0x%02x\n", __FUNCTION__ , param->pv.i & 0xff, param->pv.i >> 8); return 0; } /* * Function ircomm_param_line_status (self, param) * * * */ static int ircomm_param_line_status(void *instance, irda_param_t *param, int get) { IRDA_DEBUG(2, "%s(), not impl.\n", __FUNCTION__ ); return 0; } /* * Function ircomm_param_dte (instance, param) * * If we get here, there must be some sort of null-modem connection, and * we are probably working in server mode as well. */ static int ircomm_param_dte(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; __u8 dte; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); if (get) param->pv.i = self->settings.dte; else { dte = (__u8) param->pv.i; self->settings.dce = 0; if (dte & IRCOMM_DELTA_DTR) self->settings.dce |= (IRCOMM_DELTA_DSR| IRCOMM_DELTA_RI | IRCOMM_DELTA_CD); if (dte & IRCOMM_DTR) self->settings.dce |= (IRCOMM_DSR| IRCOMM_RI | IRCOMM_CD); if (dte & IRCOMM_DELTA_RTS) self->settings.dce |= IRCOMM_DELTA_CTS; if (dte & IRCOMM_RTS) self->settings.dce |= IRCOMM_CTS; /* Take appropriate actions */ ircomm_tty_check_modem_status(self); /* Null modem cable emulator */ self->settings.null_modem = TRUE; } return 0; } /* * Function ircomm_param_dce (instance, param) * * * */ static int ircomm_param_dce(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; __u8 dce; IRDA_DEBUG(1, "%s(), dce = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i); dce = (__u8) param->pv.i; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); self->settings.dce = dce; /* Check if any of the settings have changed */ if (dce & 0x0f) { if (dce & IRCOMM_DELTA_CTS) { IRDA_DEBUG(2, "%s(), CTS \n", __FUNCTION__ ); } } ircomm_tty_check_modem_status(self); return 0; } /* * Function ircomm_param_poll (instance, param) * * Called when the peer device is polling for the line settings * */ static int ircomm_param_poll(void *instance, irda_param_t *param, int get) { struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); /* Poll parameters are always of length 0 (just a signal) */ if (!get) { /* Respond with DTE line settings */ ircomm_param_request(self, IRCOMM_DTE, TRUE); } return 0; }