502 lines
14 KiB
C
502 lines
14 KiB
C
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/*********************************************************************
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*
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* Filename: ircomm_param.c
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* Version: 1.0
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* Description: Parameter handling for the IrCOMM protocol
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Mon Jun 7 10:25:11 1999
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* Modified at: Sun Jan 30 14:32:03 2000
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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********************************************************************/
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#include <linux/gfp.h>
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#include <linux/workqueue.h>
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#include <linux/interrupt.h>
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#include <net/irda/irda.h>
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#include <net/irda/parameters.h>
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#include <net/irda/ircomm_core.h>
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#include <net/irda/ircomm_tty_attach.h>
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#include <net/irda/ircomm_tty.h>
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#include <net/irda/ircomm_param.h>
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static int ircomm_param_service_type(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_port_type(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_port_name(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_service_type(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_data_rate(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_data_format(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_flow_control(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get);
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static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get);
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static int ircomm_param_line_status(void *instance, irda_param_t *param,
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int get);
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static int ircomm_param_dte(void *instance, irda_param_t *param, int get);
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static int ircomm_param_dce(void *instance, irda_param_t *param, int get);
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static int ircomm_param_poll(void *instance, irda_param_t *param, int get);
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static const pi_minor_info_t pi_minor_call_table_common[] = {
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{ ircomm_param_service_type, PV_INT_8_BITS },
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{ ircomm_param_port_type, PV_INT_8_BITS },
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{ ircomm_param_port_name, PV_STRING }
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};
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static const pi_minor_info_t pi_minor_call_table_non_raw[] = {
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{ ircomm_param_data_rate, PV_INT_32_BITS | PV_BIG_ENDIAN },
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{ ircomm_param_data_format, PV_INT_8_BITS },
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{ ircomm_param_flow_control, PV_INT_8_BITS },
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{ ircomm_param_xon_xoff, PV_INT_16_BITS },
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{ ircomm_param_enq_ack, PV_INT_16_BITS },
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{ ircomm_param_line_status, PV_INT_8_BITS }
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};
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static const pi_minor_info_t pi_minor_call_table_9_wire[] = {
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{ ircomm_param_dte, PV_INT_8_BITS },
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{ ircomm_param_dce, PV_INT_8_BITS },
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{ ircomm_param_poll, PV_NO_VALUE },
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};
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static const pi_major_info_t pi_major_call_table[] = {
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{ pi_minor_call_table_common, 3 },
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{ pi_minor_call_table_non_raw, 6 },
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{ pi_minor_call_table_9_wire, 3 }
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/* { pi_minor_call_table_centronics } */
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};
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pi_param_info_t ircomm_param_info = { pi_major_call_table, 3, 0x0f, 4 };
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/*
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* Function ircomm_param_request (self, pi, flush)
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*
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* Queue a parameter for the control channel
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*
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*/
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int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush)
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{
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unsigned long flags;
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struct sk_buff *skb;
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int count;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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/* Make sure we don't send parameters for raw mode */
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if (self->service_type == IRCOMM_3_WIRE_RAW)
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return 0;
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spin_lock_irqsave(&self->spinlock, flags);
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skb = self->ctrl_skb;
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if (!skb) {
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skb = alloc_skb(256, GFP_ATOMIC);
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if (!skb) {
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spin_unlock_irqrestore(&self->spinlock, flags);
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return -ENOMEM;
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}
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skb_reserve(skb, self->max_header_size);
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self->ctrl_skb = skb;
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}
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/*
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* Inserting is a little bit tricky since we don't know how much
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* room we will need. But this should hopefully work OK
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*/
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count = irda_param_insert(self, pi, skb_tail_pointer(skb),
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skb_tailroom(skb), &ircomm_param_info);
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if (count < 0) {
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net_warn_ratelimited("%s(), no room for parameter!\n",
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__func__);
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spin_unlock_irqrestore(&self->spinlock, flags);
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return -1;
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}
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skb_put(skb, count);
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pr_debug("%s(), skb->len=%d\n", __func__, skb->len);
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spin_unlock_irqrestore(&self->spinlock, flags);
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if (flush) {
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/* ircomm_tty_do_softint will take care of the rest */
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schedule_work(&self->tqueue);
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}
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return count;
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}
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/*
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* Function ircomm_param_service_type (self, buf, len)
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*
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* Handle service type, this function will both be called after the LM-IAS
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* query and then the remote device sends its initial parameters
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*
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*/
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static int ircomm_param_service_type(void *instance, irda_param_t *param,
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int get)
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{
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struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
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__u8 service_type = (__u8) param->pv.i;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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if (get) {
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param->pv.i = self->settings.service_type;
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return 0;
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}
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/* Find all common service types */
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service_type &= self->service_type;
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if (!service_type) {
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pr_debug("%s(), No common service type to use!\n", __func__);
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return -1;
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}
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pr_debug("%s(), services in common=%02x\n", __func__ ,
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service_type);
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/*
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* Now choose a preferred service type of those available
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*/
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if (service_type & IRCOMM_CENTRONICS)
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self->settings.service_type = IRCOMM_CENTRONICS;
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else if (service_type & IRCOMM_9_WIRE)
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self->settings.service_type = IRCOMM_9_WIRE;
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else if (service_type & IRCOMM_3_WIRE)
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self->settings.service_type = IRCOMM_3_WIRE;
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else if (service_type & IRCOMM_3_WIRE_RAW)
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self->settings.service_type = IRCOMM_3_WIRE_RAW;
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pr_debug("%s(), resulting service type=0x%02x\n", __func__ ,
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self->settings.service_type);
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/*
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* Now the line is ready for some communication. Check if we are a
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* server, and send over some initial parameters.
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* Client do it in ircomm_tty_state_setup().
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* Note : we may get called from ircomm_tty_getvalue_confirm(),
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* therefore before we even have open any socket. And self->client
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* is initialised to TRUE only later. So, we check if the link is
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* really initialised. - Jean II
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*/
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if ((self->max_header_size != IRCOMM_TTY_HDR_UNINITIALISED) &&
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(!self->client) &&
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(self->settings.service_type != IRCOMM_3_WIRE_RAW))
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{
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/* Init connection */
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ircomm_tty_send_initial_parameters(self);
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ircomm_tty_link_established(self);
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}
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return 0;
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}
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/*
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* Function ircomm_param_port_type (self, param)
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*
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* The port type parameter tells if the devices are serial or parallel.
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* Since we only advertise serial service, this parameter should only
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* be equal to IRCOMM_SERIAL.
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*/
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static int ircomm_param_port_type(void *instance, irda_param_t *param, int get)
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{
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struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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if (get)
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param->pv.i = IRCOMM_SERIAL;
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else {
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self->settings.port_type = (__u8) param->pv.i;
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pr_debug("%s(), port type=%d\n", __func__ ,
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self->settings.port_type);
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}
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return 0;
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}
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/*
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* Function ircomm_param_port_name (self, param)
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*
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* Exchange port name
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*
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*/
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static int ircomm_param_port_name(void *instance, irda_param_t *param, int get)
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{
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struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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if (get) {
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pr_debug("%s(), not imp!\n", __func__);
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} else {
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pr_debug("%s(), port-name=%s\n", __func__ , param->pv.c);
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strncpy(self->settings.port_name, param->pv.c, 32);
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}
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return 0;
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}
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/*
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* Function ircomm_param_data_rate (self, param)
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*
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* Exchange data rate to be used in this settings
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*
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*/
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static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get)
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{
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struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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if (get)
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param->pv.i = self->settings.data_rate;
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else
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self->settings.data_rate = param->pv.i;
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pr_debug("%s(), data rate = %d\n", __func__ , param->pv.i);
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return 0;
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}
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/*
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* Function ircomm_param_data_format (self, param)
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*
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* Exchange data format to be used in this settings
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*
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*/
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static int ircomm_param_data_format(void *instance, irda_param_t *param,
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int get)
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{
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struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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if (get)
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param->pv.i = self->settings.data_format;
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else
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self->settings.data_format = (__u8) param->pv.i;
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return 0;
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}
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/*
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* Function ircomm_param_flow_control (self, param)
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*
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* Exchange flow control settings to be used in this settings
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*
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*/
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static int ircomm_param_flow_control(void *instance, irda_param_t *param,
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int get)
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{
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struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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if (get)
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param->pv.i = self->settings.flow_control;
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else
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self->settings.flow_control = (__u8) param->pv.i;
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pr_debug("%s(), flow control = 0x%02x\n", __func__ , (__u8)param->pv.i);
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return 0;
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}
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/*
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* Function ircomm_param_xon_xoff (self, param)
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*
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* Exchange XON/XOFF characters
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*
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*/
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static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get)
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{
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struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
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if (get) {
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param->pv.i = self->settings.xonxoff[0];
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param->pv.i |= self->settings.xonxoff[1] << 8;
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} else {
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self->settings.xonxoff[0] = (__u16) param->pv.i & 0xff;
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self->settings.xonxoff[1] = (__u16) param->pv.i >> 8;
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}
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pr_debug("%s(), XON/XOFF = 0x%02x,0x%02x\n", __func__ ,
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param->pv.i & 0xff, param->pv.i >> 8);
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|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
pr_debug("%s(), ENQ/ACK = 0x%02x,0x%02x\n", __func__ ,
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
pr_debug("%s(), not impl.\n", __func__);
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
pr_debug("%s(), dce = 0x%02x\n", __func__ , (__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) {
|
||
|
|
pr_debug("%s(), CTS\n", __func__);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|