V4L/DVB (3934): Support new dvb-ttusb-budget boards with stv0297

Added config switch to stv0297 to control i2c STOP during write behaviour.
Update frontend init in dvb-ttusb-budget.
Enable i2c STOP on other users of stv0297.

Signed-off-by: Thomas Kaiser <linux-dvb AT kaiser-linux.li>
Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 31 insertions, 18 deletions

diff --git a/drivers/media/dvb/frontends/stv0297.c b/drivers/media/dvb/frontends/stv0297.c
index c8c3b74f9958..98b95a205fd2 100644
--- a/drivers/media/dvb/frontends/stv0297.c
+++ b/drivers/media/dvb/frontends/stv0297.c
@@ -68,19 +68,25 @@ static int stv0297_readreg(struct stv0297_state *state, u8 reg)
         int ret;
         u8 b0[] = { reg };
         u8 b1[] = { 0 };
-        struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len =
-                                  1},
-        {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
-        };
+        struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1},
+                                 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
+                               };
 
         // this device needs a STOP between the register and data
-        if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) {
-                dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg, ret);
-                return -1;
-        }
-        if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) {
-                dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg, ret);
-                return -1;
+        if (state->config->stop_during_read) {
+                if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) {
+                        dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg, ret);
+                        return -1;
+                }
+                if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) {
+                        dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg, ret);
+                        return -1;
+                }
+        } else {
+                if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) {
+                        dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg, ret);
+                        return -1;
+                }
         }
 
         return b1[0];
@@ -107,13 +113,20 @@ static int stv0297_readregs(struct stv0297_state *state, u8 reg1, u8 * b, u8 len
         };
 
         // this device needs a STOP between the register and data
-        if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) {
-                dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg1, ret);
-                return -1;
-        }
-        if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) {
-                dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg1, ret);
-                return -1;
+        if (state->config->stop_during_read) {
+                if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) {
+                        dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg1, ret);
+                        return -1;
+                }
+                if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) {
+                        dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg1, ret);
+                        return -1;
+                }
+        } else {
+                if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) {
+                        dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg1, ret);
+                        return -1;
+                }
         }
 
         return 0;