[PATCH] dvb: stv0299: fix FE_DISHNETWORK_SEND_LEGACY_CMD

fix the current stv0299 code that handles FE_DISHNETWORK_SEND_LEGACY_CMD.
(supports the legacy SW21, SW44, and SW64 switches)

Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 66 insertions, 12 deletions

diff --git a/drivers/media/dvb/frontends/stv0299.c b/drivers/media/dvb/frontends/stv0299.c
index 15b40541b62d..a47cd2b32d60 100644
--- a/drivers/media/dvb/frontends/stv0299.c
+++ b/drivers/media/dvb/frontends/stv0299.c
@@ -70,6 +70,7 @@ struct stv0299_state {
 #define STATUS_UCBLOCKS 1
 
 static int debug;
+static int debug_legacy_dish_switch;
 #define dprintk(args...) \
         do { \
                 if (debug) printk(KERN_DEBUG "stv0299: " args); \
@@ -385,34 +386,84 @@ static int stv0299_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltag
         };
 }
 
-static int stv0299_send_legacy_dish_cmd(struct dvb_frontend* fe, u32 cmd)
+static inline s32 stv0299_calc_usec_delay (struct timeval lasttime, struct timeval curtime)
 {
+        return ((curtime.tv_usec < lasttime.tv_usec) ?
+                1000000 - lasttime.tv_usec + curtime.tv_usec :
+                curtime.tv_usec - lasttime.tv_usec);
+}
+
+static void stv0299_sleep_until (struct timeval *waketime, u32 add_usec)
+{
+        struct timeval lasttime;
+        s32 delta, newdelta;
+
+        waketime->tv_usec += add_usec;
+        if (waketime->tv_usec >= 1000000) {
+                waketime->tv_usec -= 1000000;
+                waketime->tv_sec++;
+        }
+
+        do_gettimeofday (&lasttime);
+        delta = stv0299_calc_usec_delay (lasttime, *waketime);
+        if (delta > 2500) {
+                msleep ((delta - 1500) / 1000);
+                do_gettimeofday (&lasttime);
+                newdelta = stv0299_calc_usec_delay (lasttime, *waketime);
+                delta = (newdelta > delta) ? 0 : newdelta;
+        }
+        if (delta > 0)
+                udelay (delta);
+}
+
+static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, u32 cmd)
+{
+        struct stv0299_state* state = fe->demodulator_priv;
+        u8 reg0x08;
+        u8 reg0x0c;
+        u8 lv_mask = 0x40;
         u8 last = 1;
         int i;
+        struct timeval nexttime;
+        struct timeval tv[10];
 
-        /* reset voltage at the end
-        if((0x50 & stv0299_readreg (i2c, 0x0c)) == 0x50)
-                cmd |= 0x80;
-        else
-                cmd &= 0x7F;
-        */
+        reg0x08 = stv0299_readreg (state, 0x08);
+        reg0x0c = stv0299_readreg (state, 0x0c);
+        reg0x0c &= 0x0f;
+        stv0299_writeregI (state, 0x08, (reg0x08 & 0x3f) | (state->config->lock_output << 6));
+        if (state->config->volt13_op0_op1 == STV0299_VOLT13_OP0)
+                lv_mask = 0x10;
 
         cmd = cmd << 1;
-        dprintk("%s switch command: 0x%04x\n",__FUNCTION__, cmd);
+        if (debug_legacy_dish_switch)
+                printk ("%s switch command: 0x%04x\n",__FUNCTION__, cmd);
+
+        do_gettimeofday (&nexttime);
+        if (debug_legacy_dish_switch)
+                memcpy (&tv[0], &nexttime, sizeof (struct timeval));
+        stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */
 
-        stv0299_set_voltage(fe,SEC_VOLTAGE_18);
-        msleep(32);
+        stv0299_sleep_until (&nexttime, 32000);
 
         for (i=0; i<9; i++) {
+                if (debug_legacy_dish_switch)
+                        do_gettimeofday (&tv[i+1]);
                 if((cmd & 0x01) != last) {
-                        stv0299_set_voltage(fe, last ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
+                        /* set voltage to (last ? 13V : 18V) */
+                        stv0299_writeregI (state, 0x0c, reg0x0c | (last ? lv_mask : 0x50));
                         last = (last) ? 0 : 1;
                 }
 
                 cmd = cmd >> 1;
 
                 if (i != 8)
-                        msleep(8);
+                        stv0299_sleep_until (&nexttime, 8000);
+        }
+        if (debug_legacy_dish_switch) {
+                printk ("%s(%d): switch delay (should be 32k followed by all 8k\n",
+                        __FUNCTION__, fe->dvb->num);
+                for (i=1; i < 10; i++)
+                        printk ("%d: %d\n", i, stv0299_calc_usec_delay (tv[i-1] , tv[i]));
         }
 
         return 0;
@@ -719,6 +770,9 @@ static struct dvb_frontend_ops stv0299_ops = {
         .dishnetwork_send_legacy_command = stv0299_send_legacy_dish_cmd,
 };
 
+module_param(debug_legacy_dish_switch, int, 0444);
+MODULE_PARM_DESC(debug_legacy_dish_switch, "Enable timing analysis for Dish Network legacy switches");
+
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");