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>

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;
 };
 

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",

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