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linux/drivers/media/dvb/frontends/cx22700.c
Matthias Schwarzott 084e24acc9 V4L/DVB (12440): Use kzalloc for frontend states to have struct dvb_frontend properly 
This patch changes most frontend drivers to allocate their state structure via
kzalloc and not kmalloc. This is done to properly initialize the
embedded "struct dvb_frontend frontend" field, that they all have.

The visible effect of this struct being uninitalized is, that the member "id"
that is used to set the name of kernel thread is totally random.

Some board drivers (for example cx88-dvb) set this "id" via
videobuf_dvb_alloc_frontend but most do not.

So I at least get random id values for saa7134, flexcop and ttpci based cards.
It looks like this in dmesg:
DVB: registering adapter 1 frontend -10551321 (ST STV0299 DVB-S)

The related kernel thread then also gets a strange name
like "kdvb-ad-1-fe--1".

Cc: Michael Krufky <mkrufky@linuxtv.org>
Cc: Steven Toth <stoth@linuxtv.org>
Cc: Timothy Lee <timothy.lee@siriushk.com>
Cc: Igor M. Liplianin <liplianin@me.by>
Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Acked-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-08-13 20:39:14 -03:00

441 lines
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/*
Conexant cx22700 DVB OFDM demodulator driver
Copyright (C) 2001-2002 Convergence Integrated Media GmbH
Holger Waechtler <holger@convergence.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include "dvb_frontend.h"
#include "cx22700.h"
struct cx22700_state {
struct i2c_adapter* i2c;
const struct cx22700_config* config;
struct dvb_frontend frontend;
};
static int debug;
#define dprintk(args...) \
do { \
if (debug) printk(KERN_DEBUG "cx22700: " args); \
} while (0)
static u8 init_tab [] = {
0x04, 0x10,
0x05, 0x09,
0x06, 0x00,
0x08, 0x04,
0x09, 0x00,
0x0a, 0x01,
0x15, 0x40,
0x16, 0x10,
0x17, 0x87,
0x18, 0x17,
0x1a, 0x10,
0x25, 0x04,
0x2e, 0x00,
0x39, 0x00,
0x3a, 0x04,
0x45, 0x08,
0x46, 0x02,
0x47, 0x05,
};
static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
{
int ret;
u8 buf [] = { reg, data };
struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
dprintk ("%s\n", __func__);
ret = i2c_transfer (state->i2c, &msg, 1);
if (ret != 1)
printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
__func__, reg, data, ret);
return (ret != 1) ? -1 : 0;
}
static int cx22700_readreg (struct cx22700_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 } };
dprintk ("%s\n", __func__);
ret = i2c_transfer (state->i2c, msg, 2);
if (ret != 2) return -EIO;
return b1[0];
}
static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
{
u8 val;
dprintk ("%s\n", __func__);
switch (inversion) {
case INVERSION_AUTO:
return -EOPNOTSUPP;
case INVERSION_ON:
val = cx22700_readreg (state, 0x09);
return cx22700_writereg (state, 0x09, val | 0x01);
case INVERSION_OFF:
val = cx22700_readreg (state, 0x09);
return cx22700_writereg (state, 0x09, val & 0xfe);
default:
return -EINVAL;
}
}
static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p)
{
static const u8 qam_tab [4] = { 0, 1, 0, 2 };
static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
u8 val;
dprintk ("%s\n", __func__);
if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
return -EINVAL;
if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
return -EINVAL;
if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
return -EINVAL;
if (p->guard_interval < GUARD_INTERVAL_1_32 ||
p->guard_interval > GUARD_INTERVAL_1_4)
return -EINVAL;
if (p->transmission_mode != TRANSMISSION_MODE_2K &&
p->transmission_mode != TRANSMISSION_MODE_8K)
return -EINVAL;
if (p->constellation != QPSK &&
p->constellation != QAM_16 &&
p->constellation != QAM_64)
return -EINVAL;
if (p->hierarchy_information < HIERARCHY_NONE ||
p->hierarchy_information > HIERARCHY_4)
return -EINVAL;
if (p->bandwidth < BANDWIDTH_8_MHZ && p->bandwidth > BANDWIDTH_6_MHZ)
return -EINVAL;
if (p->bandwidth == BANDWIDTH_7_MHZ)
cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
else
cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
val = qam_tab[p->constellation - QPSK];
val |= p->hierarchy_information - HIERARCHY_NONE;
cx22700_writereg (state, 0x04, val);
val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
val |= fec_tab[p->code_rate_LP - FEC_1_2];
cx22700_writereg (state, 0x05, val);
val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
val |= p->transmission_mode - TRANSMISSION_MODE_2K;
cx22700_writereg (state, 0x06, val);
cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */
cx22700_writereg (state, 0x08, 0x04); /* restart aquisition */
return 0;
}
static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p)
{
static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
FEC_5_6, FEC_7_8 };
u8 val;
dprintk ("%s\n", __func__);
if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */
return -EAGAIN;
val = cx22700_readreg (state, 0x01);
if ((val & 0x7) > 4)
p->hierarchy_information = HIERARCHY_AUTO;
else
p->hierarchy_information = HIERARCHY_NONE + (val & 0x7);
if (((val >> 3) & 0x3) > 2)
p->constellation = QAM_AUTO;
else
p->constellation = qam_tab[(val >> 3) & 0x3];
val = cx22700_readreg (state, 0x02);
if (((val >> 3) & 0x07) > 4)
p->code_rate_HP = FEC_AUTO;
else
p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
if ((val & 0x07) > 4)
p->code_rate_LP = FEC_AUTO;
else
p->code_rate_LP = fec_tab[val & 0x07];
val = cx22700_readreg (state, 0x03);
p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
return 0;
}
static int cx22700_init (struct dvb_frontend* fe)
{ struct cx22700_state* state = fe->demodulator_priv;
int i;
dprintk("cx22700_init: init chip\n");
cx22700_writereg (state, 0x00, 0x02); /* soft reset */
cx22700_writereg (state, 0x00, 0x00);
msleep(10);
for (i=0; i<sizeof(init_tab); i+=2)
cx22700_writereg (state, init_tab[i], init_tab[i+1]);
cx22700_writereg (state, 0x00, 0x01);
return 0;
}
static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
struct cx22700_state* state = fe->demodulator_priv;
u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
| (cx22700_readreg (state, 0x0e) << 1);
u8 sync = cx22700_readreg (state, 0x07);
*status = 0;
if (rs_ber < 0xff00)
*status |= FE_HAS_SIGNAL;
if (sync & 0x20)
*status |= FE_HAS_CARRIER;
if (sync & 0x10)
*status |= FE_HAS_VITERBI;
if (sync & 0x10)
*status |= FE_HAS_SYNC;
if (*status == 0x0f)
*status |= FE_HAS_LOCK;
return 0;
}
static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
{
struct cx22700_state* state = fe->demodulator_priv;
*ber = cx22700_readreg (state, 0x0c) & 0x7f;
cx22700_writereg (state, 0x0c, 0x00);
return 0;
}
static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
{
struct cx22700_state* state = fe->demodulator_priv;
u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
| (cx22700_readreg (state, 0x0e) << 1);
*signal_strength = ~rs_ber;
return 0;
}
static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
{
struct cx22700_state* state = fe->demodulator_priv;
u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
| (cx22700_readreg (state, 0x0e) << 1);
*snr = ~rs_ber;
return 0;
}
static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
struct cx22700_state* state = fe->demodulator_priv;
*ucblocks = cx22700_readreg (state, 0x0f);
cx22700_writereg (state, 0x0f, 0x00);
return 0;
}
static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
struct cx22700_state* state = fe->demodulator_priv;
cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
cx22700_writereg (state, 0x00, 0x00);
if (fe->ops.tuner_ops.set_params) {
fe->ops.tuner_ops.set_params(fe, p);
if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
}
cx22700_set_inversion (state, p->inversion);
cx22700_set_tps (state, &p->u.ofdm);
cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */
cx22700_writereg (state, 0x00, 0x01); /* restart acquire */
return 0;
}
static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
struct cx22700_state* state = fe->demodulator_priv;
u8 reg09 = cx22700_readreg (state, 0x09);
p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
return cx22700_get_tps (state, &p->u.ofdm);
}
static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
struct cx22700_state* state = fe->demodulator_priv;
if (enable) {
return cx22700_writereg(state, 0x0a, 0x00);
} else {
return cx22700_writereg(state, 0x0a, 0x01);
}
}
static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
{
fesettings->min_delay_ms = 150;
fesettings->step_size = 166667;
fesettings->max_drift = 166667*2;
return 0;
}
static void cx22700_release(struct dvb_frontend* fe)
{
struct cx22700_state* state = fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops cx22700_ops;
struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
struct i2c_adapter* i2c)
{
struct cx22700_state* state = NULL;
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
if (state == NULL) goto error;
/* setup the state */
state->config = config;
state->i2c = i2c;
/* check if the demod is there */
if (cx22700_readreg(state, 0x07) < 0) goto error;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
error:
kfree(state);
return NULL;
}
static struct dvb_frontend_ops cx22700_ops = {
.info = {
.name = "Conexant CX22700 DVB-T",
.type = FE_OFDM,
.frequency_min = 470000000,
.frequency_max = 860000000,
.frequency_stepsize = 166667,
.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
FE_CAN_RECOVER
},
.release = cx22700_release,
.init = cx22700_init,
.i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
.set_frontend = cx22700_set_frontend,
.get_frontend = cx22700_get_frontend,
.get_tune_settings = cx22700_get_tune_settings,
.read_status = cx22700_read_status,
.read_ber = cx22700_read_ber,
.read_signal_strength = cx22700_read_signal_strength,
.read_snr = cx22700_read_snr,
.read_ucblocks = cx22700_read_ucblocks,
};
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
MODULE_AUTHOR("Holger Waechtler");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(cx22700_attach);
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