mISDN: Add watchdog functionality to hfcmulti driver

This patch was made by Titus Moldovan and provides IOCTL functions for enabling
and disabling the controller's built in watchdog. The use is optional.

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 34 insertions, 2 deletions

diff --git a/drivers/isdn/hardware/mISDN/hfc_multi.h b/drivers/isdn/hardware/mISDN/hfc_multi.h
index 663b77f578be..5765e1962911 100644
--- a/drivers/isdn/hardware/mISDN/hfc_multi.h
+++ b/drivers/isdn/hardware/mISDN/hfc_multi.h
@@ -62,6 +62,7 @@ struct hfcm_hw {
         u_char  r_sci_msk;
         u_char  r_tx0, r_tx1;
         u_char  a_st_ctrl0[8];
+        u_char  r_bert_wd_md;
         timer_t timer;
 };
 
diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c
index 0b28141e43bf..ca153de6954e 100644
--- a/drivers/isdn/hardware/mISDN/hfcmulti.c
+++ b/drivers/isdn/hardware/mISDN/hfcmulti.c
@@ -4013,11 +4013,41 @@ open_bchannel(struct hfc_multi *hc, struct dchannel *dch,
 static int
 channel_dctrl(struct dchannel *dch, struct mISDN_ctrl_req *cq)
 {
+        struct hfc_multi        *hc = dch->hw;
         int     ret = 0;
+        int     wd_mode, wd_cnt;
 
         switch (cq->op) {
         case MISDN_CTRL_GETOP:
-                cq->op = 0;
+                cq->op = MISDN_CTRL_HFC_OP;
+                break;
+        case MISDN_CTRL_HFC_WD_INIT: /* init the watchdog */
+                wd_cnt = cq->p1 & 0xf;
+                wd_mode = !!(cq->p1 >> 4);
+                if (debug & DEBUG_HFCMULTI_MSG)
+                        printk(KERN_DEBUG
+                            "%s: MISDN_CTRL_HFC_WD_INIT mode %s counter 0x%x\n",
+                            __func__, wd_mode ? "AUTO" : "MANUAL", wd_cnt);
+                /* set the watchdog timer */
+                HFC_outb(hc, R_TI_WD, poll_timer | (wd_cnt << 4));
+                hc->hw.r_bert_wd_md = (wd_mode ? V_AUTO_WD_RES : 0);
+                if (hc->ctype == HFC_TYPE_XHFC)
+                        hc->hw.r_bert_wd_md |= 0x40 /* V_WD_EN */;
+                /* init the watchdog register and reset the counter */
+                HFC_outb(hc, R_BERT_WD_MD, hc->hw.r_bert_wd_md | V_WD_RES);
+                if (test_bit(HFC_CHIP_PLXSD, &hc->chip)) {
+                        /* enable the watchdog output for Speech-Design */
+                        HFC_outb(hc, R_GPIO_SEL, V_GPIO_SEL7);
+                        HFC_outb(hc, R_GPIO_EN1, V_GPIO_EN15);
+                        HFC_outb(hc, R_GPIO_OUT1, 0);
+                        HFC_outb(hc, R_GPIO_OUT1, V_GPIO_OUT15);
+                }
+                break;
+        case MISDN_CTRL_HFC_WD_RESET: /* reset the watchdog counter */
+                if (debug & DEBUG_HFCMULTI_MSG)
+                        printk(KERN_DEBUG "%s: MISDN_CTRL_HFC_WD_RESET\n",
+                            __func__);
+                HFC_outb(hc, R_BERT_WD_MD, hc->hw.r_bert_wd_md | V_WD_RES);
                 break;
         default:
                 printk(KERN_WARNING "%s: unknown Op %x\n",
diff --git a/include/linux/mISDNif.h b/include/linux/mISDNif.h
index 5da3d95b27f1..cf974593a99e 100644
--- a/include/linux/mISDNif.h
+++ b/include/linux/mISDNif.h
@@ -362,7 +362,8 @@ clear_channelmap(u_int nr, u_char *map)
 #define MISDN_CTRL_HFC_RECEIVE_ON       0x4006
 #define MISDN_CTRL_HFC_ECHOCAN_ON       0x4007
 #define MISDN_CTRL_HFC_ECHOCAN_OFF      0x4008
-
+#define MISDN_CTRL_HFC_WD_INIT          0x4009
+#define MISDN_CTRL_HFC_WD_RESET         0x400A
 
 /* socket options */
 #define MISDN_TIME_STAMP                0x0001