V4L/DVB (13980): [STV6110x] Added function stv6110x_write_regs

The function stv6110x_write_regs is used to write several registers at once.

Signed-off-by: Andreas Regel <andreas.regel@gmx.de>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 24 insertions, 10 deletions

diff --git a/drivers/media/dvb/frontends/stv6110x.c b/drivers/media/dvb/frontends/stv6110x.c
index bcfcb652464c..09e3aef8073b 100644
--- a/drivers/media/dvb/frontends/stv6110x.c
+++ b/drivers/media/dvb/frontends/stv6110x.c
@@ -58,12 +58,23 @@ static int stv6110x_read_reg(struct stv6110x_state *stv6110x, u8 reg, u8 *data)
         return 0;
 }
 
-static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
+static int stv6110x_write_regs(struct stv6110x_state *stv6110x, int start, u8 data[], int len)
 {
         int ret;
         const struct stv6110x_config *config = stv6110x->config;
-        u8 buf[] = { reg, data };
-        struct i2c_msg msg = { .addr = config->addr, .flags = 0, . buf = buf, .len = 2 };
+        u8 buf[len + 1];
+        struct i2c_msg msg = {
+                .addr = config->addr,
+                .flags = 0,
+                .buf = buf,
+                .len = len + 1
+        };
+
+        if (start + len > 8)
+                return -EINVAL;
+
+        buf[0] = start;
+        memcpy(&buf[1], data, len);
 
         ret = i2c_transfer(stv6110x->i2c, &msg, 1);
         if (ret != 1) {
@@ -74,18 +85,21 @@ static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
         return 0;
 }
 
+static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
+{
+        return stv6110x_write_regs(stv6110x, reg, &data, 1);
+}
+
 static int stv6110x_init(struct dvb_frontend *fe)
 {
         struct stv6110x_state *stv6110x = fe->tuner_priv;
         int ret;
-        u8 i;
 
-        for (i = 0; i < ARRAY_SIZE(stv6110x_regs); i++) {
-                ret = stv6110x_write_reg(stv6110x, i, stv6110x_regs[i]);
-                if (ret < 0) {
-                        dprintk(FE_ERROR, 1, "Initialization failed");
-                        return -1;
-                }
+        ret = stv6110x_write_regs(stv6110x, 0, stv6110x_regs,
+                                  ARRAY_SIZE(stv6110x_regs));
+        if (ret < 0) {
+                dprintk(FE_ERROR, 1, "Initialization failed");
+                return -1;
         }
 
         return 0;