diff options
Diffstat (limited to 'kernel/drivers/net/hamradio/baycom_ser_hdx.c')
| -rw-r--r-- | kernel/drivers/net/hamradio/baycom_ser_hdx.c | 743 |
1 files changed, 743 insertions, 0 deletions
diff --git a/kernel/drivers/net/hamradio/baycom_ser_hdx.c b/kernel/drivers/net/hamradio/baycom_ser_hdx.c new file mode 100644 index 000000000..f9a897619 --- /dev/null +++ b/kernel/drivers/net/hamradio/baycom_ser_hdx.c @@ -0,0 +1,743 @@ +/*****************************************************************************/ + +/* + * baycom_ser_hdx.c -- baycom ser12 halfduplex radio modem driver. + * + * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Please note that the GPL allows you to use the driver, NOT the radio. + * In order to use the radio, you need a license from the communications + * authority of your country. + * + * + * Supported modems + * + * ser12: This is a very simple 1200 baud AFSK modem. The modem consists only + * of a modulator/demodulator chip, usually a TI TCM3105. The computer + * is responsible for regenerating the receiver bit clock, as well as + * for handling the HDLC protocol. The modem connects to a serial port, + * hence the name. Since the serial port is not used as an async serial + * port, the kernel driver for serial ports cannot be used, and this + * driver only supports standard serial hardware (8250, 16450, 16550A) + * + * + * Command line options (insmod command line) + * + * mode ser12 hardware DCD + * ser12* software DCD + * ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware + * mutes audio input to the modem + * ser12+ hardware DCD, inverted signal at DCD pin + * iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8 + * irq interrupt line of the port; common values are 4,3 + * + * + * History: + * 0.1 26.06.1996 Adapted from baycom.c and made network driver interface + * 18.10.1996 Changed to new user space access routines (copy_{to,from}_user) + * 0.3 26.04.1997 init code/data tagged + * 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints) + * 0.5 11.11.1997 ser12/par96 split into separate files + * 0.6 14.04.1998 cleanups + * 0.7 03.08.1999 adapt to Linus' new __setup/__initcall + * 0.8 10.08.1999 use module_init/module_exit + * 0.9 12.02.2000 adapted to softnet driver interface + * 0.10 03.07.2000 fix interface name handling + */ + +/*****************************************************************************/ + +#include <linux/capability.h> +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <asm/uaccess.h> +#include <asm/io.h> +#include <linux/hdlcdrv.h> +#include <linux/baycom.h> +#include <linux/jiffies.h> + +/* --------------------------------------------------------------------- */ + +#define BAYCOM_DEBUG + +/* --------------------------------------------------------------------- */ + +static const char bc_drvname[] = "baycom_ser_hdx"; +static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n" +"baycom_ser_hdx: version 0.10\n"; + +/* --------------------------------------------------------------------- */ + +#define NR_PORTS 4 + +static struct net_device *baycom_device[NR_PORTS]; + +/* --------------------------------------------------------------------- */ + +#define RBR(iobase) (iobase+0) +#define THR(iobase) (iobase+0) +#define IER(iobase) (iobase+1) +#define IIR(iobase) (iobase+2) +#define FCR(iobase) (iobase+2) +#define LCR(iobase) (iobase+3) +#define MCR(iobase) (iobase+4) +#define LSR(iobase) (iobase+5) +#define MSR(iobase) (iobase+6) +#define SCR(iobase) (iobase+7) +#define DLL(iobase) (iobase+0) +#define DLM(iobase) (iobase+1) + +#define SER12_EXTENT 8 + +/* ---------------------------------------------------------------------- */ +/* + * Information that need to be kept for each board. + */ + +struct baycom_state { + struct hdlcdrv_state hdrv; + + int opt_dcd; + + struct modem_state { + short arb_divider; + unsigned char flags; + unsigned int shreg; + struct modem_state_ser12 { + unsigned char tx_bit; + int dcd_sum0, dcd_sum1, dcd_sum2; + unsigned char last_sample; + unsigned char last_rxbit; + unsigned int dcd_shreg; + unsigned int dcd_time; + unsigned int bit_pll; + unsigned char interm_sample; + } ser12; + } modem; + +#ifdef BAYCOM_DEBUG + struct debug_vals { + unsigned long last_jiffies; + unsigned cur_intcnt; + unsigned last_intcnt; + int cur_pllcorr; + int last_pllcorr; + } debug_vals; +#endif /* BAYCOM_DEBUG */ +}; + +/* --------------------------------------------------------------------- */ + +static inline void baycom_int_freq(struct baycom_state *bc) +{ +#ifdef BAYCOM_DEBUG + unsigned long cur_jiffies = jiffies; + /* + * measure the interrupt frequency + */ + bc->debug_vals.cur_intcnt++; + if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { + bc->debug_vals.last_jiffies = cur_jiffies; + bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; + bc->debug_vals.cur_intcnt = 0; + bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr; + bc->debug_vals.cur_pllcorr = 0; + } +#endif /* BAYCOM_DEBUG */ +} + +/* --------------------------------------------------------------------- */ +/* + * ===================== SER12 specific routines ========================= + */ + +static inline void ser12_set_divisor(struct net_device *dev, + unsigned char divisor) +{ + outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */ + outb(divisor, DLL(dev->base_addr)); + outb(0, DLM(dev->base_addr)); + outb(0x01, LCR(dev->base_addr)); /* word length = 6 */ + /* + * make sure the next interrupt is generated; + * 0 must be used to power the modem; the modem draws its + * power from the TxD line + */ + outb(0x00, THR(dev->base_addr)); + /* + * it is important not to set the divider while transmitting; + * this reportedly makes some UARTs generating interrupts + * in the hundredthousands per second region + * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno) + */ +} + +/* --------------------------------------------------------------------- */ + +/* + * must call the TX arbitrator every 10ms + */ +#define SER12_ARB_DIVIDER(bc) (bc->opt_dcd ? 24 : 36) + +#define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240) + +static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc) +{ + /* one interrupt per channel bit */ + ser12_set_divisor(dev, 12); + /* + * first output the last bit (!) then call HDLC transmitter, + * since this may take quite long + */ + outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr)); + if (bc->modem.shreg <= 1) + bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv); + bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ + (bc->modem.shreg & 1)); + bc->modem.shreg >>= 1; +} + +/* --------------------------------------------------------------------- */ + +static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc) +{ + unsigned char cur_s; + /* + * do demodulator + */ + cur_s = inb(MSR(dev->base_addr)) & 0x10; /* the CTS line */ + hdlcdrv_channelbit(&bc->hdrv, cur_s); + bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) | + (cur_s != bc->modem.ser12.last_sample); + bc->modem.ser12.last_sample = cur_s; + if(bc->modem.ser12.dcd_shreg & 1) { + if (!bc->opt_dcd) { + unsigned int dcdspos, dcdsneg; + + dcdspos = dcdsneg = 0; + dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1); + if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe)) + dcdspos += 2; + dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1); + dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1); + dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1); + + bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg; + } else + bc->modem.ser12.dcd_sum0--; + } + if(!bc->modem.ser12.dcd_time) { + hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + + bc->modem.ser12.dcd_sum1 + + bc->modem.ser12.dcd_sum2) < 0); + bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1; + bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0; + /* offset to ensure DCD off on silent input */ + bc->modem.ser12.dcd_sum0 = 2; + bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc); + } + bc->modem.ser12.dcd_time--; + if (!bc->opt_dcd) { + /* + * PLL code for the improved software DCD algorithm + */ + if (bc->modem.ser12.interm_sample) { + /* + * intermediate sample; set timing correction to normal + */ + ser12_set_divisor(dev, 4); + } else { + /* + * do PLL correction and call HDLC receiver + */ + switch (bc->modem.ser12.dcd_shreg & 7) { + case 1: /* transition too late */ + ser12_set_divisor(dev, 5); +#ifdef BAYCOM_DEBUG + bc->debug_vals.cur_pllcorr++; +#endif /* BAYCOM_DEBUG */ + break; + case 4: /* transition too early */ + ser12_set_divisor(dev, 3); +#ifdef BAYCOM_DEBUG + bc->debug_vals.cur_pllcorr--; +#endif /* BAYCOM_DEBUG */ + break; + default: + ser12_set_divisor(dev, 4); + break; + } + bc->modem.shreg >>= 1; + if (bc->modem.ser12.last_sample == + bc->modem.ser12.last_rxbit) + bc->modem.shreg |= 0x10000; + bc->modem.ser12.last_rxbit = + bc->modem.ser12.last_sample; + } + if (++bc->modem.ser12.interm_sample >= 3) + bc->modem.ser12.interm_sample = 0; + /* + * DCD stuff + */ + if (bc->modem.ser12.dcd_shreg & 1) { + unsigned int dcdspos, dcdsneg; + + dcdspos = dcdsneg = 0; + dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1); + dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe)) + << 1; + dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1); + dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1); + dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1); + + bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg; + } + } else { + /* + * PLL algorithm for the hardware squelch DCD algorithm + */ + if (bc->modem.ser12.interm_sample) { + /* + * intermediate sample; set timing correction to normal + */ + ser12_set_divisor(dev, 6); + } else { + /* + * do PLL correction and call HDLC receiver + */ + switch (bc->modem.ser12.dcd_shreg & 3) { + case 1: /* transition too late */ + ser12_set_divisor(dev, 7); +#ifdef BAYCOM_DEBUG + bc->debug_vals.cur_pllcorr++; +#endif /* BAYCOM_DEBUG */ + break; + case 2: /* transition too early */ + ser12_set_divisor(dev, 5); +#ifdef BAYCOM_DEBUG + bc->debug_vals.cur_pllcorr--; +#endif /* BAYCOM_DEBUG */ + break; + default: + ser12_set_divisor(dev, 6); + break; + } + bc->modem.shreg >>= 1; + if (bc->modem.ser12.last_sample == + bc->modem.ser12.last_rxbit) + bc->modem.shreg |= 0x10000; + bc->modem.ser12.last_rxbit = + bc->modem.ser12.last_sample; + } + bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample; + /* + * DCD stuff + */ + bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1); + } + outb(0x0d, MCR(dev->base_addr)); /* transmitter off */ + if (bc->modem.shreg & 1) { + hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1); + bc->modem.shreg = 0x10000; + } + if(!bc->modem.ser12.dcd_time) { + if (bc->opt_dcd & 1) + hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80)); + else + hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + + bc->modem.ser12.dcd_sum1 + + bc->modem.ser12.dcd_sum2) < 0); + bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1; + bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0; + /* offset to ensure DCD off on silent input */ + bc->modem.ser12.dcd_sum0 = 2; + bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc); + } + bc->modem.ser12.dcd_time--; +} + +/* --------------------------------------------------------------------- */ + +static irqreturn_t ser12_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = (struct net_device *)dev_id; + struct baycom_state *bc = netdev_priv(dev); + unsigned char iir; + + if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC) + return IRQ_NONE; + /* fast way out */ + if ((iir = inb(IIR(dev->base_addr))) & 1) + return IRQ_NONE; + baycom_int_freq(bc); + do { + switch (iir & 6) { + case 6: + inb(LSR(dev->base_addr)); + break; + + case 4: + inb(RBR(dev->base_addr)); + break; + + case 2: + /* + * check if transmitter active + */ + if (hdlcdrv_ptt(&bc->hdrv)) + ser12_tx(dev, bc); + else { + ser12_rx(dev, bc); + bc->modem.arb_divider--; + } + outb(0x00, THR(dev->base_addr)); + break; + + default: + inb(MSR(dev->base_addr)); + break; + } + iir = inb(IIR(dev->base_addr)); + } while (!(iir & 1)); + if (bc->modem.arb_divider <= 0) { + bc->modem.arb_divider = SER12_ARB_DIVIDER(bc); + local_irq_enable(); + hdlcdrv_arbitrate(dev, &bc->hdrv); + } + local_irq_enable(); + hdlcdrv_transmitter(dev, &bc->hdrv); + hdlcdrv_receiver(dev, &bc->hdrv); + local_irq_disable(); + return IRQ_HANDLED; +} + +/* --------------------------------------------------------------------- */ + +enum uart { c_uart_unknown, c_uart_8250, + c_uart_16450, c_uart_16550, c_uart_16550A}; +static const char *uart_str[] = { + "unknown", "8250", "16450", "16550", "16550A" +}; + +static enum uart ser12_check_uart(unsigned int iobase) +{ + unsigned char b1,b2,b3; + enum uart u; + enum uart uart_tab[] = + { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A }; + + b1 = inb(MCR(iobase)); + outb(b1 | 0x10, MCR(iobase)); /* loopback mode */ + b2 = inb(MSR(iobase)); + outb(0x1a, MCR(iobase)); + b3 = inb(MSR(iobase)) & 0xf0; + outb(b1, MCR(iobase)); /* restore old values */ + outb(b2, MSR(iobase)); + if (b3 != 0x90) + return c_uart_unknown; + inb(RBR(iobase)); + inb(RBR(iobase)); + outb(0x01, FCR(iobase)); /* enable FIFOs */ + u = uart_tab[(inb(IIR(iobase)) >> 6) & 3]; + if (u == c_uart_16450) { + outb(0x5a, SCR(iobase)); + b1 = inb(SCR(iobase)); + outb(0xa5, SCR(iobase)); + b2 = inb(SCR(iobase)); + if ((b1 != 0x5a) || (b2 != 0xa5)) + u = c_uart_8250; + } + return u; +} + +/* --------------------------------------------------------------------- */ + +static int ser12_open(struct net_device *dev) +{ + struct baycom_state *bc = netdev_priv(dev); + enum uart u; + + if (!dev || !bc) + return -ENXIO; + if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT || + dev->irq < 2 || dev->irq > 15) + return -ENXIO; + if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12")) + return -EACCES; + memset(&bc->modem, 0, sizeof(bc->modem)); + bc->hdrv.par.bitrate = 1200; + if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) { + release_region(dev->base_addr, SER12_EXTENT); + return -EIO; + } + outb(0, FCR(dev->base_addr)); /* disable FIFOs */ + outb(0x0d, MCR(dev->base_addr)); + outb(0, IER(dev->base_addr)); + if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED, + "baycom_ser12", dev)) { + release_region(dev->base_addr, SER12_EXTENT); + return -EBUSY; + } + /* + * enable transmitter empty interrupt + */ + outb(2, IER(dev->base_addr)); + /* + * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that + * we get exactly (hopefully) 2 or 3 interrupts per radio symbol, + * depending on the usage of the software DCD routine + */ + ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4); + printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n", + bc_drvname, dev->base_addr, dev->irq, uart_str[u]); + return 0; +} + +/* --------------------------------------------------------------------- */ + +static int ser12_close(struct net_device *dev) +{ + struct baycom_state *bc = netdev_priv(dev); + + if (!dev || !bc) + return -EINVAL; + /* + * disable interrupts + */ + outb(0, IER(dev->base_addr)); + outb(1, MCR(dev->base_addr)); + free_irq(dev->irq, dev); + release_region(dev->base_addr, SER12_EXTENT); + printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n", + bc_drvname, dev->base_addr, dev->irq); + return 0; +} + +/* --------------------------------------------------------------------- */ +/* + * ===================== hdlcdrv driver interface ========================= + */ + +/* --------------------------------------------------------------------- */ + +static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, + struct hdlcdrv_ioctl *hi, int cmd); + +/* --------------------------------------------------------------------- */ + +static struct hdlcdrv_ops ser12_ops = { + .drvname = bc_drvname, + .drvinfo = bc_drvinfo, + .open = ser12_open, + .close = ser12_close, + .ioctl = baycom_ioctl, +}; + +/* --------------------------------------------------------------------- */ + +static int baycom_setmode(struct baycom_state *bc, const char *modestr) +{ + if (strchr(modestr, '*')) + bc->opt_dcd = 0; + else if (strchr(modestr, '+')) + bc->opt_dcd = -1; + else if (strchr(modestr, '@')) + bc->opt_dcd = -2; + else + bc->opt_dcd = 1; + return 0; +} + +/* --------------------------------------------------------------------- */ + +static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, + struct hdlcdrv_ioctl *hi, int cmd) +{ + struct baycom_state *bc; + struct baycom_ioctl bi; + + if (!dev) + return -EINVAL; + + bc = netdev_priv(dev); + BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC); + + if (cmd != SIOCDEVPRIVATE) + return -ENOIOCTLCMD; + switch (hi->cmd) { + default: + break; + + case HDLCDRVCTL_GETMODE: + strcpy(hi->data.modename, "ser12"); + if (bc->opt_dcd <= 0) + strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+"); + if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) + return -EFAULT; + return 0; + + case HDLCDRVCTL_SETMODE: + if (netif_running(dev) || !capable(CAP_NET_ADMIN)) + return -EACCES; + hi->data.modename[sizeof(hi->data.modename)-1] = '\0'; + return baycom_setmode(bc, hi->data.modename); + + case HDLCDRVCTL_MODELIST: + strcpy(hi->data.modename, "ser12"); + if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl))) + return -EFAULT; + return 0; + + case HDLCDRVCTL_MODEMPARMASK: + return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ; + + } + + if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) + return -EFAULT; + switch (bi.cmd) { + default: + return -ENOIOCTLCMD; + +#ifdef BAYCOM_DEBUG + case BAYCOMCTL_GETDEBUG: + bi.data.dbg.debug1 = bc->hdrv.ptt_keyed; + bi.data.dbg.debug2 = bc->debug_vals.last_intcnt; + bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr; + break; +#endif /* BAYCOM_DEBUG */ + + } + if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) + return -EFAULT; + return 0; + +} + +/* --------------------------------------------------------------------- */ + +/* + * command line settable parameters + */ +static char *mode[NR_PORTS] = { "ser12*", }; +static int iobase[NR_PORTS] = { 0x3f8, }; +static int irq[NR_PORTS] = { 4, }; + +module_param_array(mode, charp, NULL, 0); +MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD"); +module_param_array(iobase, int, NULL, 0); +MODULE_PARM_DESC(iobase, "baycom io base address"); +module_param_array(irq, int, NULL, 0); +MODULE_PARM_DESC(irq, "baycom irq number"); + +MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); +MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver"); +MODULE_LICENSE("GPL"); + +/* --------------------------------------------------------------------- */ + +static int __init init_baycomserhdx(void) +{ + int i, found = 0; + char set_hw = 1; + + printk(bc_drvinfo); + /* + * register net devices + */ + for (i = 0; i < NR_PORTS; i++) { + struct net_device *dev; + struct baycom_state *bc; + char ifname[IFNAMSIZ]; + + sprintf(ifname, "bcsh%d", i); + + if (!mode[i]) + set_hw = 0; + if (!set_hw) + iobase[i] = irq[i] = 0; + + dev = hdlcdrv_register(&ser12_ops, + sizeof(struct baycom_state), + ifname, iobase[i], irq[i], 0); + if (IS_ERR(dev)) + break; + + bc = netdev_priv(dev); + if (set_hw && baycom_setmode(bc, mode[i])) + set_hw = 0; + found++; + baycom_device[i] = dev; + } + + if (!found) + return -ENXIO; + return 0; +} + +static void __exit cleanup_baycomserhdx(void) +{ + int i; + + for(i = 0; i < NR_PORTS; i++) { + struct net_device *dev = baycom_device[i]; + + if (dev) + hdlcdrv_unregister(dev); + } +} + +module_init(init_baycomserhdx); +module_exit(cleanup_baycomserhdx); + +/* --------------------------------------------------------------------- */ + +#ifndef MODULE + +/* + * format: baycom_ser_hdx=io,irq,mode + * mode: ser12 hardware DCD + * ser12* software DCD + * ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware + * mutes audio input to the modem + * ser12+ hardware DCD, inverted signal at DCD pin + */ + +static int __init baycom_ser_hdx_setup(char *str) +{ + static unsigned nr_dev; + int ints[3]; + + if (nr_dev >= NR_PORTS) + return 0; + str = get_options(str, 3, ints); + if (ints[0] < 2) + return 0; + mode[nr_dev] = str; + iobase[nr_dev] = ints[1]; + irq[nr_dev] = ints[2]; + nr_dev++; + return 1; +} + +__setup("baycom_ser_hdx=", baycom_ser_hdx_setup); + +#endif /* MODULE */ +/* --------------------------------------------------------------------- */ |