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path: root/drivers/net/hamradio/baycom_ser_hdx.c
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-rw-r--r--drivers/net/hamradio/baycom_ser_hdx.c727
1 files changed, 727 insertions, 0 deletions
diff --git a/drivers/net/hamradio/baycom_ser_hdx.c b/drivers/net/hamradio/baycom_ser_hdx.c
new file mode 100644
index 000000000..a1acb3a47
--- /dev/null
+++ b/drivers/net/hamradio/baycom_ser_hdx.c
@@ -0,0 +1,727 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*****************************************************************************/
+
+/*
+ * baycom_ser_hdx.c -- baycom ser12 halfduplex radio modem driver.
+ *
+ * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ * 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 <linux/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 const 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_hw_array(iobase, int, ioport, NULL, 0);
+MODULE_PARM_DESC(iobase, "baycom io base address");
+module_param_hw_array(irq, int, irq, 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 */
+/* --------------------------------------------------------------------- */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 06:53:04 +0000