tmp64 = (u64)a * (u64)b;
        do_div(tmp64, c);
 
-       return (u32) tmp64;
+       return (u32)tmp64;
 }
 
 static int i2c_read(struct i2c_adapter *adap,
                index = 6;
        if (index > 50)
                index = 50;
-       if ((state->reg[0x08] & ~0xFC) == ((index-6) << 2))
+       if ((state->reg[0x08] & ~0xFC) == ((index - 6) << 2))
                return 0;
 
-       state->reg[0x08] = (state->reg[0x08] & ~0xFC) | ((index-6) << 2);
+       state->reg[0x08] = (state->reg[0x08] & ~0xFC) | ((index - 6) << 2);
        state->reg[0x09] = (state->reg[0x09] & ~0x0C) | 0x08;
        if (fe->ops.i2c_gate_ctrl)
                fe->ops.i2c_gate_ctrl(fe, 1);
        int i;
 
        /* Assumes Table[0].RegValue < Table[imax].RegValue */
-       if (reg_value <= table[0].reg_value)
+       if (reg_value <= table[0].reg_value) {
                gain = table[0].value;
-       else if (reg_value >= table[imax].reg_value)
+       } else if (reg_value >= table[imax].reg_value) {
                gain = table[imax].value;
-       else {
-               while (imax-imin > 1) {
+       } else {
+               while ((imax - imin) > 1) {
                        i = (imax + imin) / 2;
                        if ((table[imin].reg_value <= reg_value) &&
                            (reg_value <= table[i].reg_value))
                reg_diff = table[imax].reg_value - table[imin].reg_value;
                gain = table[imin].value;
                if (reg_diff != 0)
-                       gain += ((s32) (reg_value - table[imin].reg_value) *
+                       gain += ((s32)(reg_value - table[imin].reg_value) *
                                (s32)(table[imax].value
-                               - table[imin].value))/(reg_diff);
+                               - table[imin].value)) / reg_diff;
        }
        return gain;
 }
                if ((state->reg[0x02] & 0x80) == 0)
                        /* NF */
                        gain = table_lookup(lnagain_nf_lookup,
-                               ARRAY_SIZE(lnagain_nf_lookup), reg & 0x1F);
+                                           ARRAY_SIZE(lnagain_nf_lookup),
+                                           reg & 0x1F);
                else
                        /* IIP3 */
                        gain = table_lookup(lnagain_iip3_lookup,
-                               ARRAY_SIZE(lnagain_iip3_lookup), reg & 0x1F);
+                                           ARRAY_SIZE(lnagain_iip3_lookup),
+                                           reg & 0x1F);
 
                gain += table_lookup(gain_rfagc_lookup,
-                               ARRAY_SIZE(gain_rfagc_lookup), rfagc);
+                                    ARRAY_SIZE(gain_rfagc_lookup), rfagc);
+
                gain -= 2400;
        } else {
                /* Channel Mode */
                if ((state->reg[0x02] & 0x80) == 0) {
                        /* NF */
-                       gain = table_lookup(gain_channel_agc_nf_lookup,
+                       gain = table_lookup(
+                               gain_channel_agc_nf_lookup,
                                ARRAY_SIZE(gain_channel_agc_nf_lookup), rfagc);
+
                        gain += 600;
                } else {
                        /* IIP3 */
-                       gain = table_lookup(gain_channel_agc_iip3_lookup,
+                       gain = table_lookup(
+                               gain_channel_agc_iip3_lookup,
                                ARRAY_SIZE(gain_channel_agc_iip3_lookup),
-                                       rfagc);
+                               rfagc);
                }
        }
 
        struct stv *state;
        int stat;
 
-       state = kzalloc(sizeof(struct stv), GFP_KERNEL);
+       state = kzalloc(sizeof(*state), GFP_KERNEL);
        if (!state)
                return NULL;
        state->adr = adr;
 
 
 #if IS_REACHABLE(CONFIG_DVB_STV6111)
 
-extern struct dvb_frontend *stv6111_attach(struct dvb_frontend *fe,
-                               struct i2c_adapter *i2c, u8 adr);
+struct dvb_frontend *stv6111_attach(struct dvb_frontend *fe,
+                                   struct i2c_adapter *i2c, u8 adr);
 
 #else
 
 static inline struct dvb_frontend *stv6111_attach(struct dvb_frontend *fe,
-                               struct i2c_adapter *i2c, u8 adr)
+                                                 struct i2c_adapter *i2c,
+                                                 u8 adr)
 {
        pr_warn("%s: Driver disabled by Kconfig\n", __func__);
        return NULL;