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727 lines
20 KiB
727 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/*****************************************************************************/ |
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/* |
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* baycom_ser_hdx.c -- baycom ser12 halfduplex radio modem driver. |
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* |
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* Copyright (C) 1996-2000 Thomas Sailer ([email protected]) |
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* |
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* Please note that the GPL allows you to use the driver, NOT the radio. |
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* In order to use the radio, you need a license from the communications |
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* authority of your country. |
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* |
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* Supported modems |
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* |
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* ser12: This is a very simple 1200 baud AFSK modem. The modem consists only |
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* of a modulator/demodulator chip, usually a TI TCM3105. The computer |
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* is responsible for regenerating the receiver bit clock, as well as |
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* for handling the HDLC protocol. The modem connects to a serial port, |
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* hence the name. Since the serial port is not used as an async serial |
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* port, the kernel driver for serial ports cannot be used, and this |
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* driver only supports standard serial hardware (8250, 16450, 16550A) |
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* |
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* Command line options (insmod command line) |
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* |
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* mode ser12 hardware DCD |
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* ser12* software DCD |
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* ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware |
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* mutes audio input to the modem |
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* ser12+ hardware DCD, inverted signal at DCD pin |
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* iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8 |
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* irq interrupt line of the port; common values are 4,3 |
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* |
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* History: |
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* 0.1 26.06.1996 Adapted from baycom.c and made network driver interface |
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* 18.10.1996 Changed to new user space access routines (copy_{to,from}_user) |
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* 0.3 26.04.1997 init code/data tagged |
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* 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints) |
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* 0.5 11.11.1997 ser12/par96 split into separate files |
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* 0.6 14.04.1998 cleanups |
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* 0.7 03.08.1999 adapt to Linus' new __setup/__initcall |
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* 0.8 10.08.1999 use module_init/module_exit |
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* 0.9 12.02.2000 adapted to softnet driver interface |
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* 0.10 03.07.2000 fix interface name handling |
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*/ |
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/*****************************************************************************/ |
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#include <linux/capability.h> |
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#include <linux/module.h> |
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#include <linux/ioport.h> |
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#include <linux/string.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/uaccess.h> |
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#include <asm/io.h> |
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#include <linux/hdlcdrv.h> |
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#include <linux/baycom.h> |
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#include <linux/jiffies.h> |
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/* --------------------------------------------------------------------- */ |
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#define BAYCOM_DEBUG |
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/* --------------------------------------------------------------------- */ |
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static const char bc_drvname[] = "baycom_ser_hdx"; |
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static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n" |
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"baycom_ser_hdx: version 0.10\n"; |
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/* --------------------------------------------------------------------- */ |
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#define NR_PORTS 4 |
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static struct net_device *baycom_device[NR_PORTS]; |
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/* --------------------------------------------------------------------- */ |
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#define RBR(iobase) (iobase+0) |
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#define THR(iobase) (iobase+0) |
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#define IER(iobase) (iobase+1) |
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#define IIR(iobase) (iobase+2) |
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#define FCR(iobase) (iobase+2) |
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#define LCR(iobase) (iobase+3) |
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#define MCR(iobase) (iobase+4) |
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#define LSR(iobase) (iobase+5) |
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#define MSR(iobase) (iobase+6) |
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#define SCR(iobase) (iobase+7) |
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#define DLL(iobase) (iobase+0) |
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#define DLM(iobase) (iobase+1) |
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#define SER12_EXTENT 8 |
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/* ---------------------------------------------------------------------- */ |
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/* |
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* Information that need to be kept for each board. |
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*/ |
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struct baycom_state { |
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struct hdlcdrv_state hdrv; |
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int opt_dcd; |
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struct modem_state { |
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short arb_divider; |
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unsigned char flags; |
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unsigned int shreg; |
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struct modem_state_ser12 { |
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unsigned char tx_bit; |
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int dcd_sum0, dcd_sum1, dcd_sum2; |
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unsigned char last_sample; |
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unsigned char last_rxbit; |
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unsigned int dcd_shreg; |
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unsigned int dcd_time; |
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unsigned int bit_pll; |
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unsigned char interm_sample; |
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} ser12; |
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} modem; |
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#ifdef BAYCOM_DEBUG |
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struct debug_vals { |
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unsigned long last_jiffies; |
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unsigned cur_intcnt; |
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unsigned last_intcnt; |
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int cur_pllcorr; |
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int last_pllcorr; |
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} debug_vals; |
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#endif /* BAYCOM_DEBUG */ |
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}; |
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/* --------------------------------------------------------------------- */ |
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static inline void baycom_int_freq(struct baycom_state *bc) |
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{ |
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#ifdef BAYCOM_DEBUG |
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unsigned long cur_jiffies = jiffies; |
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/* |
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* measure the interrupt frequency |
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*/ |
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bc->debug_vals.cur_intcnt++; |
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if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { |
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bc->debug_vals.last_jiffies = cur_jiffies; |
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bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; |
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bc->debug_vals.cur_intcnt = 0; |
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bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr; |
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bc->debug_vals.cur_pllcorr = 0; |
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} |
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#endif /* BAYCOM_DEBUG */ |
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} |
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/* --------------------------------------------------------------------- */ |
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/* |
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* ===================== SER12 specific routines ========================= |
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*/ |
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static inline void ser12_set_divisor(struct net_device *dev, |
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unsigned char divisor) |
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{ |
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outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */ |
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outb(divisor, DLL(dev->base_addr)); |
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outb(0, DLM(dev->base_addr)); |
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outb(0x01, LCR(dev->base_addr)); /* word length = 6 */ |
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/* |
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* make sure the next interrupt is generated; |
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* 0 must be used to power the modem; the modem draws its |
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* power from the TxD line |
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*/ |
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outb(0x00, THR(dev->base_addr)); |
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/* |
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* it is important not to set the divider while transmitting; |
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* this reportedly makes some UARTs generating interrupts |
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* in the hundredthousands per second region |
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* Reported by: [email protected] (Ignacio Arenaza Nuno) |
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*/ |
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} |
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/* --------------------------------------------------------------------- */ |
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/* |
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* must call the TX arbitrator every 10ms |
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*/ |
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#define SER12_ARB_DIVIDER(bc) (bc->opt_dcd ? 24 : 36) |
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#define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240) |
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static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc) |
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{ |
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/* one interrupt per channel bit */ |
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ser12_set_divisor(dev, 12); |
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/* |
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* first output the last bit (!) then call HDLC transmitter, |
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* since this may take quite long |
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*/ |
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outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr)); |
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if (bc->modem.shreg <= 1) |
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bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv); |
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bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ |
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(bc->modem.shreg & 1)); |
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bc->modem.shreg >>= 1; |
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} |
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/* --------------------------------------------------------------------- */ |
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static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc) |
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{ |
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unsigned char cur_s; |
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/* |
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* do demodulator |
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*/ |
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cur_s = inb(MSR(dev->base_addr)) & 0x10; /* the CTS line */ |
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hdlcdrv_channelbit(&bc->hdrv, cur_s); |
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bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) | |
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(cur_s != bc->modem.ser12.last_sample); |
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bc->modem.ser12.last_sample = cur_s; |
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if(bc->modem.ser12.dcd_shreg & 1) { |
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if (!bc->opt_dcd) { |
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unsigned int dcdspos, dcdsneg; |
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dcdspos = dcdsneg = 0; |
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dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1); |
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if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe)) |
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dcdspos += 2; |
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dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1); |
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dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1); |
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dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1); |
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bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg; |
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} else |
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bc->modem.ser12.dcd_sum0--; |
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} |
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if(!bc->modem.ser12.dcd_time) { |
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hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + |
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bc->modem.ser12.dcd_sum1 + |
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bc->modem.ser12.dcd_sum2) < 0); |
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bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1; |
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bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0; |
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/* offset to ensure DCD off on silent input */ |
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bc->modem.ser12.dcd_sum0 = 2; |
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bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc); |
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} |
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bc->modem.ser12.dcd_time--; |
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if (!bc->opt_dcd) { |
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/* |
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* PLL code for the improved software DCD algorithm |
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*/ |
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if (bc->modem.ser12.interm_sample) { |
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/* |
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* intermediate sample; set timing correction to normal |
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*/ |
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ser12_set_divisor(dev, 4); |
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} else { |
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/* |
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* do PLL correction and call HDLC receiver |
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*/ |
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switch (bc->modem.ser12.dcd_shreg & 7) { |
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case 1: /* transition too late */ |
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ser12_set_divisor(dev, 5); |
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#ifdef BAYCOM_DEBUG |
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bc->debug_vals.cur_pllcorr++; |
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#endif /* BAYCOM_DEBUG */ |
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break; |
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case 4: /* transition too early */ |
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ser12_set_divisor(dev, 3); |
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#ifdef BAYCOM_DEBUG |
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bc->debug_vals.cur_pllcorr--; |
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#endif /* BAYCOM_DEBUG */ |
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break; |
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default: |
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ser12_set_divisor(dev, 4); |
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break; |
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} |
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bc->modem.shreg >>= 1; |
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if (bc->modem.ser12.last_sample == |
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bc->modem.ser12.last_rxbit) |
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bc->modem.shreg |= 0x10000; |
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bc->modem.ser12.last_rxbit = |
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bc->modem.ser12.last_sample; |
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} |
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if (++bc->modem.ser12.interm_sample >= 3) |
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bc->modem.ser12.interm_sample = 0; |
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/* |
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* DCD stuff |
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*/ |
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if (bc->modem.ser12.dcd_shreg & 1) { |
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unsigned int dcdspos, dcdsneg; |
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dcdspos = dcdsneg = 0; |
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dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1); |
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dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe)) |
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<< 1; |
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dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1); |
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dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1); |
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dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1); |
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bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg; |
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} |
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} else { |
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/* |
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* PLL algorithm for the hardware squelch DCD algorithm |
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*/ |
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if (bc->modem.ser12.interm_sample) { |
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/* |
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* intermediate sample; set timing correction to normal |
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*/ |
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ser12_set_divisor(dev, 6); |
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} else { |
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/* |
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* do PLL correction and call HDLC receiver |
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*/ |
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switch (bc->modem.ser12.dcd_shreg & 3) { |
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case 1: /* transition too late */ |
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ser12_set_divisor(dev, 7); |
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#ifdef BAYCOM_DEBUG |
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bc->debug_vals.cur_pllcorr++; |
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#endif /* BAYCOM_DEBUG */ |
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break; |
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case 2: /* transition too early */ |
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ser12_set_divisor(dev, 5); |
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#ifdef BAYCOM_DEBUG |
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bc->debug_vals.cur_pllcorr--; |
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#endif /* BAYCOM_DEBUG */ |
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break; |
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default: |
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ser12_set_divisor(dev, 6); |
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break; |
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} |
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bc->modem.shreg >>= 1; |
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if (bc->modem.ser12.last_sample == |
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bc->modem.ser12.last_rxbit) |
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bc->modem.shreg |= 0x10000; |
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bc->modem.ser12.last_rxbit = |
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bc->modem.ser12.last_sample; |
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} |
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bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample; |
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/* |
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* DCD stuff |
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*/ |
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bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1); |
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} |
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outb(0x0d, MCR(dev->base_addr)); /* transmitter off */ |
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if (bc->modem.shreg & 1) { |
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hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1); |
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bc->modem.shreg = 0x10000; |
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} |
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if(!bc->modem.ser12.dcd_time) { |
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if (bc->opt_dcd & 1) |
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hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80)); |
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else |
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hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + |
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bc->modem.ser12.dcd_sum1 + |
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bc->modem.ser12.dcd_sum2) < 0); |
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bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1; |
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bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0; |
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/* offset to ensure DCD off on silent input */ |
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bc->modem.ser12.dcd_sum0 = 2; |
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bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc); |
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} |
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bc->modem.ser12.dcd_time--; |
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} |
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/* --------------------------------------------------------------------- */ |
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static irqreturn_t ser12_interrupt(int irq, void *dev_id) |
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{ |
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struct net_device *dev = (struct net_device *)dev_id; |
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struct baycom_state *bc = netdev_priv(dev); |
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unsigned char iir; |
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if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC) |
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return IRQ_NONE; |
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/* fast way out */ |
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if ((iir = inb(IIR(dev->base_addr))) & 1) |
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return IRQ_NONE; |
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baycom_int_freq(bc); |
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do { |
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switch (iir & 6) { |
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case 6: |
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inb(LSR(dev->base_addr)); |
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break; |
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case 4: |
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inb(RBR(dev->base_addr)); |
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break; |
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case 2: |
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/* |
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* check if transmitter active |
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*/ |
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if (hdlcdrv_ptt(&bc->hdrv)) |
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ser12_tx(dev, bc); |
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else { |
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ser12_rx(dev, bc); |
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bc->modem.arb_divider--; |
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} |
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outb(0x00, THR(dev->base_addr)); |
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break; |
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default: |
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inb(MSR(dev->base_addr)); |
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break; |
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} |
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iir = inb(IIR(dev->base_addr)); |
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} while (!(iir & 1)); |
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if (bc->modem.arb_divider <= 0) { |
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bc->modem.arb_divider = SER12_ARB_DIVIDER(bc); |
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local_irq_enable(); |
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hdlcdrv_arbitrate(dev, &bc->hdrv); |
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} |
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local_irq_enable(); |
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hdlcdrv_transmitter(dev, &bc->hdrv); |
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hdlcdrv_receiver(dev, &bc->hdrv); |
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local_irq_disable(); |
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return IRQ_HANDLED; |
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} |
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/* --------------------------------------------------------------------- */ |
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enum uart { c_uart_unknown, c_uart_8250, |
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c_uart_16450, c_uart_16550, c_uart_16550A}; |
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static const char *uart_str[] = { |
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"unknown", "8250", "16450", "16550", "16550A" |
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}; |
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static enum uart ser12_check_uart(unsigned int iobase) |
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{ |
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unsigned char b1,b2,b3; |
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enum uart u; |
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enum uart uart_tab[] = |
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{ c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A }; |
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b1 = inb(MCR(iobase)); |
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outb(b1 | 0x10, MCR(iobase)); /* loopback mode */ |
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b2 = inb(MSR(iobase)); |
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outb(0x1a, MCR(iobase)); |
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b3 = inb(MSR(iobase)) & 0xf0; |
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outb(b1, MCR(iobase)); /* restore old values */ |
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outb(b2, MSR(iobase)); |
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if (b3 != 0x90) |
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return c_uart_unknown; |
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inb(RBR(iobase)); |
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inb(RBR(iobase)); |
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outb(0x01, FCR(iobase)); /* enable FIFOs */ |
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u = uart_tab[(inb(IIR(iobase)) >> 6) & 3]; |
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if (u == c_uart_16450) { |
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outb(0x5a, SCR(iobase)); |
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b1 = inb(SCR(iobase)); |
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outb(0xa5, SCR(iobase)); |
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b2 = inb(SCR(iobase)); |
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if ((b1 != 0x5a) || (b2 != 0xa5)) |
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u = c_uart_8250; |
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} |
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return u; |
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} |
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/* --------------------------------------------------------------------- */ |
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static int ser12_open(struct net_device *dev) |
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{ |
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struct baycom_state *bc = netdev_priv(dev); |
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enum uart u; |
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if (!dev || !bc) |
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return -ENXIO; |
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if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT || |
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dev->irq < 2 || dev->irq > 15) |
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return -ENXIO; |
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if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12")) |
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return -EACCES; |
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memset(&bc->modem, 0, sizeof(bc->modem)); |
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bc->hdrv.par.bitrate = 1200; |
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if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) { |
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release_region(dev->base_addr, SER12_EXTENT); |
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return -EIO; |
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} |
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outb(0, FCR(dev->base_addr)); /* disable FIFOs */ |
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outb(0x0d, MCR(dev->base_addr)); |
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outb(0, IER(dev->base_addr)); |
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if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED, |
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"baycom_ser12", dev)) { |
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release_region(dev->base_addr, SER12_EXTENT); |
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return -EBUSY; |
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} |
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/* |
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* enable transmitter empty interrupt |
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*/ |
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outb(2, IER(dev->base_addr)); |
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/* |
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* set the SIO to 6 Bits/character and 19200 or 28800 baud, so that |
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* we get exactly (hopefully) 2 or 3 interrupts per radio symbol, |
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* depending on the usage of the software DCD routine |
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*/ |
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ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4); |
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printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n", |
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bc_drvname, dev->base_addr, dev->irq, uart_str[u]); |
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return 0; |
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} |
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/* --------------------------------------------------------------------- */ |
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static int ser12_close(struct net_device *dev) |
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{ |
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struct baycom_state *bc = netdev_priv(dev); |
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if (!dev || !bc) |
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return -EINVAL; |
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/* |
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* disable interrupts |
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*/ |
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outb(0, IER(dev->base_addr)); |
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outb(1, MCR(dev->base_addr)); |
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free_irq(dev->irq, dev); |
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release_region(dev->base_addr, SER12_EXTENT); |
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printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n", |
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bc_drvname, dev->base_addr, dev->irq); |
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return 0; |
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} |
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/* --------------------------------------------------------------------- */ |
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/* |
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* ===================== hdlcdrv driver interface ========================= |
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*/ |
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/* --------------------------------------------------------------------- */ |
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static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, |
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struct hdlcdrv_ioctl *hi, int cmd); |
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/* --------------------------------------------------------------------- */ |
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static const struct hdlcdrv_ops ser12_ops = { |
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.drvname = bc_drvname, |
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.drvinfo = bc_drvinfo, |
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.open = ser12_open, |
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.close = ser12_close, |
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.ioctl = baycom_ioctl, |
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}; |
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/* --------------------------------------------------------------------- */ |
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static int baycom_setmode(struct baycom_state *bc, const char *modestr) |
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{ |
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if (strchr(modestr, '*')) |
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bc->opt_dcd = 0; |
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else if (strchr(modestr, '+')) |
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bc->opt_dcd = -1; |
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else if (strchr(modestr, '@')) |
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bc->opt_dcd = -2; |
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else |
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bc->opt_dcd = 1; |
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return 0; |
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} |
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/* --------------------------------------------------------------------- */ |
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static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, |
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struct hdlcdrv_ioctl *hi, int cmd) |
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{ |
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struct baycom_state *bc; |
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struct baycom_ioctl bi; |
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if (!dev) |
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return -EINVAL; |
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bc = netdev_priv(dev); |
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BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC); |
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if (cmd != SIOCDEVPRIVATE) |
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return -ENOIOCTLCMD; |
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switch (hi->cmd) { |
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default: |
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break; |
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case HDLCDRVCTL_GETMODE: |
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strcpy(hi->data.modename, "ser12"); |
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if (bc->opt_dcd <= 0) |
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strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+"); |
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if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) |
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return -EFAULT; |
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return 0; |
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case HDLCDRVCTL_SETMODE: |
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if (netif_running(dev) || !capable(CAP_NET_ADMIN)) |
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return -EACCES; |
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hi->data.modename[sizeof(hi->data.modename)-1] = '\0'; |
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return baycom_setmode(bc, hi->data.modename); |
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case HDLCDRVCTL_MODELIST: |
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strcpy(hi->data.modename, "ser12"); |
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if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) |
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return -EFAULT; |
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return 0; |
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case HDLCDRVCTL_MODEMPARMASK: |
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return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ; |
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} |
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if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) |
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return -EFAULT; |
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switch (bi.cmd) { |
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default: |
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return -ENOIOCTLCMD; |
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#ifdef BAYCOM_DEBUG |
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case BAYCOMCTL_GETDEBUG: |
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bi.data.dbg.debug1 = bc->hdrv.ptt_keyed; |
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bi.data.dbg.debug2 = bc->debug_vals.last_intcnt; |
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bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr; |
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break; |
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#endif /* BAYCOM_DEBUG */ |
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} |
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if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) |
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return -EFAULT; |
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return 0; |
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} |
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/* --------------------------------------------------------------------- */ |
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/* |
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* command line settable parameters |
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*/ |
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static char *mode[NR_PORTS] = { "ser12*", }; |
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static int iobase[NR_PORTS] = { 0x3f8, }; |
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static int irq[NR_PORTS] = { 4, }; |
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module_param_array(mode, charp, NULL, 0); |
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MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD"); |
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module_param_hw_array(iobase, int, ioport, NULL, 0); |
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MODULE_PARM_DESC(iobase, "baycom io base address"); |
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module_param_hw_array(irq, int, irq, NULL, 0); |
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MODULE_PARM_DESC(irq, "baycom irq number"); |
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MODULE_AUTHOR("Thomas M. Sailer, [email protected], [email protected]"); |
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MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver"); |
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MODULE_LICENSE("GPL"); |
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/* --------------------------------------------------------------------- */ |
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static int __init init_baycomserhdx(void) |
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{ |
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int i, found = 0; |
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char set_hw = 1; |
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printk(bc_drvinfo); |
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/* |
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* register net devices |
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*/ |
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for (i = 0; i < NR_PORTS; i++) { |
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struct net_device *dev; |
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struct baycom_state *bc; |
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char ifname[IFNAMSIZ]; |
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sprintf(ifname, "bcsh%d", i); |
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if (!mode[i]) |
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set_hw = 0; |
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if (!set_hw) |
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iobase[i] = irq[i] = 0; |
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dev = hdlcdrv_register(&ser12_ops, |
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sizeof(struct baycom_state), |
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ifname, iobase[i], irq[i], 0); |
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if (IS_ERR(dev)) |
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break; |
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bc = netdev_priv(dev); |
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if (set_hw && baycom_setmode(bc, mode[i])) |
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set_hw = 0; |
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found++; |
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baycom_device[i] = dev; |
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} |
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if (!found) |
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return -ENXIO; |
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return 0; |
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} |
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static void __exit cleanup_baycomserhdx(void) |
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{ |
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int i; |
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for(i = 0; i < NR_PORTS; i++) { |
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struct net_device *dev = baycom_device[i]; |
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if (dev) |
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hdlcdrv_unregister(dev); |
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} |
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} |
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module_init(init_baycomserhdx); |
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module_exit(cleanup_baycomserhdx); |
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/* --------------------------------------------------------------------- */ |
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#ifndef MODULE |
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/* |
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* format: baycom_ser_hdx=io,irq,mode |
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* mode: ser12 hardware DCD |
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* ser12* software DCD |
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* ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware |
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* mutes audio input to the modem |
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* ser12+ hardware DCD, inverted signal at DCD pin |
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*/ |
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static int __init baycom_ser_hdx_setup(char *str) |
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{ |
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static unsigned nr_dev; |
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int ints[3]; |
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if (nr_dev >= NR_PORTS) |
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return 0; |
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str = get_options(str, 3, ints); |
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if (ints[0] < 2) |
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return 0; |
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mode[nr_dev] = str; |
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iobase[nr_dev] = ints[1]; |
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irq[nr_dev] = ints[2]; |
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nr_dev++; |
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return 1; |
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} |
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__setup("baycom_ser_hdx=", baycom_ser_hdx_setup); |
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#endif /* MODULE */ |
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/* --------------------------------------------------------------------- */
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