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>

diff --git a/drivers/media/dvb/frontends/stv6110x.c b/drivers/media/dvb/frontends/stv6110x.c
index bcfcb65..09e3aef 100644 (file)
--- 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;