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path: root/drivers/media/dvb/frontends/cx22702.c
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Diffstat (limited to 'drivers/media/dvb/frontends/cx22702.c')
-rw-r--r--drivers/media/dvb/frontends/cx22702.c123
1 files changed, 60 insertions, 63 deletions
diff --git a/drivers/media/dvb/frontends/cx22702.c b/drivers/media/dvb/frontends/cx22702.c
index 00b5c7e91d5..ff6c4983051 100644
--- a/drivers/media/dvb/frontends/cx22702.c
+++ b/drivers/media/dvb/frontends/cx22702.c
@@ -54,7 +54,7 @@ MODULE_PARM_DESC(debug, "Enable verbose debug messages");
#define dprintk if (debug) printk
/* Register values to initialise the demod */
-static u8 init_tab[] = {
+static const u8 init_tab[] = {
0x00, 0x00, /* Stop aquisition */
0x0B, 0x06,
0x09, 0x01,
@@ -92,52 +92,56 @@ static int cx22702_writereg(struct cx22702_state *state, u8 reg, u8 data)
ret = i2c_transfer(state->i2c, &msg, 1);
- if (ret != 1)
+ if (unlikely(ret != 1)) {
printk(KERN_ERR
"%s: error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
__func__, reg, data, ret);
+ return -1;
+ }
- return (ret != 1) ? -1 : 0;
+ return 0;
}
static u8 cx22702_readreg(struct cx22702_state *state, u8 reg)
{
int ret;
- u8 b0[] = { reg };
- u8 b1[] = { 0 };
+ u8 data;
struct i2c_msg msg[] = {
{ .addr = state->config->demod_address, .flags = 0,
- .buf = b0, .len = 1 },
+ .buf = &reg, .len = 1 },
{ .addr = state->config->demod_address, .flags = I2C_M_RD,
- .buf = b1, .len = 1 } };
+ .buf = &data, .len = 1 } };
ret = i2c_transfer(state->i2c, msg, 2);
- if (ret != 2)
- printk(KERN_ERR "%s: readreg error (ret == %i)\n",
- __func__, ret);
+ if (unlikely(ret != 2)) {
+ printk(KERN_ERR "%s: error (reg == 0x%02x, ret == %i)\n",
+ __func__, reg, ret);
+ return 0;
+ }
- return b1[0];
+ return data;
}
static int cx22702_set_inversion(struct cx22702_state *state, int inversion)
{
u8 val;
+ val = cx22702_readreg(state, 0x0C);
switch (inversion) {
case INVERSION_AUTO:
return -EOPNOTSUPP;
case INVERSION_ON:
- val = cx22702_readreg(state, 0x0C);
- return cx22702_writereg(state, 0x0C, val | 0x01);
+ val |= 0x01;
+ break;
case INVERSION_OFF:
- val = cx22702_readreg(state, 0x0C);
- return cx22702_writereg(state, 0x0C, val & 0xfe);
+ val &= 0xfe;
+ break;
default:
return -EINVAL;
}
-
+ return cx22702_writereg(state, 0x0C, val);
}
/* Retrieve the demod settings */
@@ -244,13 +248,15 @@ static int cx22702_get_tps(struct cx22702_state *state,
static int cx22702_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
{
struct cx22702_state *state = fe->demodulator_priv;
+ u8 val;
+
dprintk("%s(%d)\n", __func__, enable);
+ val = cx22702_readreg(state, 0x0D);
if (enable)
- return cx22702_writereg(state, 0x0D,
- cx22702_readreg(state, 0x0D) & 0xfe);
+ val &= 0xfe;
else
- return cx22702_writereg(state, 0x0D,
- cx22702_readreg(state, 0x0D) | 1);
+ val |= 0x01;
+ return cx22702_writereg(state, 0x0D, val);
}
/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
@@ -270,23 +276,21 @@ static int cx22702_set_tps(struct dvb_frontend *fe,
cx22702_set_inversion(state, p->inversion);
/* set bandwidth */
+ val = cx22702_readreg(state, 0x0C) & 0xcf;
switch (p->u.ofdm.bandwidth) {
case BANDWIDTH_6_MHZ:
- cx22702_writereg(state, 0x0C,
- (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20);
+ val |= 0x20;
break;
case BANDWIDTH_7_MHZ:
- cx22702_writereg(state, 0x0C,
- (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10);
+ val |= 0x10;
break;
case BANDWIDTH_8_MHZ:
- cx22702_writereg(state, 0x0C,
- cx22702_readreg(state, 0x0C) & 0xcf);
break;
default:
dprintk("%s: invalid bandwidth\n", __func__);
return -EINVAL;
}
+ cx22702_writereg(state, 0x0C, val);
p->u.ofdm.code_rate_LP = FEC_AUTO; /* temp hack as manual not working */
@@ -312,33 +316,31 @@ static int cx22702_set_tps(struct dvb_frontend *fe,
}
/* manually programmed values */
- val = 0;
- switch (p->u.ofdm.constellation) {
+ switch (p->u.ofdm.constellation) { /* mask 0x18 */
case QPSK:
- val = (val & 0xe7);
+ val = 0x00;
break;
case QAM_16:
- val = (val & 0xe7) | 0x08;
+ val = 0x08;
break;
case QAM_64:
- val = (val & 0xe7) | 0x10;
+ val = 0x10;
break;
default:
dprintk("%s: invalid constellation\n", __func__);
return -EINVAL;
}
- switch (p->u.ofdm.hierarchy_information) {
+ switch (p->u.ofdm.hierarchy_information) { /* mask 0x07 */
case HIERARCHY_NONE:
- val = (val & 0xf8);
break;
case HIERARCHY_1:
- val = (val & 0xf8) | 1;
+ val |= 0x01;
break;
case HIERARCHY_2:
- val = (val & 0xf8) | 2;
+ val |= 0x02;
break;
case HIERARCHY_4:
- val = (val & 0xf8) | 3;
+ val |= 0x03;
break;
default:
dprintk("%s: invalid hierarchy\n", __func__);
@@ -346,44 +348,42 @@ static int cx22702_set_tps(struct dvb_frontend *fe,
}
cx22702_writereg(state, 0x06, val);
- val = 0;
- switch (p->u.ofdm.code_rate_HP) {
+ switch (p->u.ofdm.code_rate_HP) { /* mask 0x38 */
case FEC_NONE:
case FEC_1_2:
- val = (val & 0xc7);
+ val = 0x00;
break;
case FEC_2_3:
- val = (val & 0xc7) | 0x08;
+ val = 0x08;
break;
case FEC_3_4:
- val = (val & 0xc7) | 0x10;
+ val = 0x10;
break;
case FEC_5_6:
- val = (val & 0xc7) | 0x18;
+ val = 0x18;
break;
case FEC_7_8:
- val = (val & 0xc7) | 0x20;
+ val = 0x20;
break;
default:
dprintk("%s: invalid code_rate_HP\n", __func__);
return -EINVAL;
}
- switch (p->u.ofdm.code_rate_LP) {
+ switch (p->u.ofdm.code_rate_LP) { /* mask 0x07 */
case FEC_NONE:
case FEC_1_2:
- val = (val & 0xf8);
break;
case FEC_2_3:
- val = (val & 0xf8) | 1;
+ val |= 0x01;
break;
case FEC_3_4:
- val = (val & 0xf8) | 2;
+ val |= 0x02;
break;
case FEC_5_6:
- val = (val & 0xf8) | 3;
+ val |= 0x03;
break;
case FEC_7_8:
- val = (val & 0xf8) | 4;
+ val |= 0x04;
break;
default:
dprintk("%s: invalid code_rate_LP\n", __func__);
@@ -391,30 +391,28 @@ static int cx22702_set_tps(struct dvb_frontend *fe,
}
cx22702_writereg(state, 0x07, val);
- val = 0;
- switch (p->u.ofdm.guard_interval) {
+ switch (p->u.ofdm.guard_interval) { /* mask 0x0c */
case GUARD_INTERVAL_1_32:
- val = (val & 0xf3);
+ val = 0x00;
break;
case GUARD_INTERVAL_1_16:
- val = (val & 0xf3) | 0x04;
+ val = 0x04;
break;
case GUARD_INTERVAL_1_8:
- val = (val & 0xf3) | 0x08;
+ val = 0x08;
break;
case GUARD_INTERVAL_1_4:
- val = (val & 0xf3) | 0x0c;
+ val = 0x0c;
break;
default:
dprintk("%s: invalid guard_interval\n", __func__);
return -EINVAL;
}
- switch (p->u.ofdm.transmission_mode) {
+ switch (p->u.ofdm.transmission_mode) { /* mask 0x03 */
case TRANSMISSION_MODE_2K:
- val = (val & 0xfc);
break;
case TRANSMISSION_MODE_8K:
- val = (val & 0xfc) | 1;
+ val |= 0x1;
break;
default:
dprintk("%s: invalid transmission_mode\n", __func__);
@@ -505,7 +503,7 @@ static int cx22702_read_signal_strength(struct dvb_frontend *fe,
{
struct cx22702_state *state = fe->demodulator_priv;
- u16 rs_ber = 0;
+ u16 rs_ber;
rs_ber = cx22702_readreg(state, 0x23);
*signal_strength = (rs_ber << 8) | rs_ber;
@@ -516,7 +514,7 @@ static int cx22702_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct cx22702_state *state = fe->demodulator_priv;
- u16 rs_ber = 0;
+ u16 rs_ber;
if (cx22702_readreg(state, 0xE4) & 0x02) {
/* Realtime statistics */
rs_ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7
@@ -572,7 +570,7 @@ static void cx22702_release(struct dvb_frontend *fe)
kfree(state);
}
-static struct dvb_frontend_ops cx22702_ops;
+static const struct dvb_frontend_ops cx22702_ops;
struct dvb_frontend *cx22702_attach(const struct cx22702_config *config,
struct i2c_adapter *i2c)
@@ -587,7 +585,6 @@ struct dvb_frontend *cx22702_attach(const struct cx22702_config *config,
/* setup the state */
state->config = config;
state->i2c = i2c;
- state->prevUCBlocks = 0;
/* check if the demod is there */
if (cx22702_readreg(state, 0x1f) != 0x3)
@@ -605,7 +602,7 @@ error:
}
EXPORT_SYMBOL(cx22702_attach);
-static struct dvb_frontend_ops cx22702_ops = {
+static const struct dvb_frontend_ops cx22702_ops = {
.info = {
.name = "Conexant CX22702 DVB-T",
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 00:08:02 +0000