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linux-stable/drivers/media/dvb-frontends/s5h1432.c
Peter Senna Tschudin 47aab4ab20 [media] drivers/media/dvb-frontends/s5h1432.c: Removes useless kfree() 
Remove useless kfree() and clean up code related to the removal.
The semantic patch that finds this problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@r exists@
position p1,p2;
expression x;
@@
if (x@p1 == NULL) { ... kfree@p2(x); ... return ...; }
@unchanged exists@
position r.p1,r.p2;
expression e <= r.x,x,e1;
iterator I;
statement S;
@@
if (x@p1 == NULL) { ... when != I(x,...) S
                        when != e = e1
                        when != e += e1
                        when != e -= e1
                        when != ++e
                        when != --e
                        when != e++
                        when != e--
                        when != &e
   kfree@p2(x); ... return ...; }
@ok depends on unchanged exists@
position any r.p1;
position r.p2;
expression x;
@@
... when != true x@p1 == NULL
kfree@p2(x);
@depends on !ok && unchanged@
position r.p2;
expression x;
@@
*kfree@p2(x);
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-06 11:13:07 -03:00

403 lines
11 KiB
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/*
* Samsung s5h1432 DVB-T demodulator driver
*
* Copyright (C) 2009 Bill Liu <Bill.Liu@Conexant.com>
*
* 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 <linux/delay.h>
#include "dvb_frontend.h"
#include "s5h1432.h"
struct s5h1432_state {
struct i2c_adapter *i2c;
/* configuration settings */
const struct s5h1432_config *config;
struct dvb_frontend frontend;
fe_modulation_t current_modulation;
unsigned int first_tune:1;
u32 current_frequency;
int if_freq;
u8 inversion;
};
static int debug;
#define dprintk(arg...) do { \
if (debug) \
printk(arg); \
} while (0)
static int s5h1432_writereg(struct s5h1432_state *state,
u8 addr, u8 reg, u8 data)
{
int ret;
u8 buf[] = { reg, data };
struct i2c_msg msg = {.addr = addr, .flags = 0, .buf = buf, .len = 2 };
ret = i2c_transfer(state->i2c, &msg, 1);
if (ret != 1)
printk(KERN_ERR "%s: writereg error 0x%02x 0x%02x 0x%04x, "
"ret == %i)\n", __func__, addr, reg, data, ret);
return (ret != 1) ? -1 : 0;
}
static u8 s5h1432_readreg(struct s5h1432_state *state, u8 addr, u8 reg)
{
int ret;
u8 b0[] = { reg };
u8 b1[] = { 0 };
struct i2c_msg msg[] = {
{.addr = addr, .flags = 0, .buf = b0, .len = 1},
{.addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 1}
};
ret = i2c_transfer(state->i2c, msg, 2);
if (ret != 2)
printk(KERN_ERR "%s: readreg error (ret == %i)\n",
__func__, ret);
return b1[0];
}
static int s5h1432_sleep(struct dvb_frontend *fe)
{
return 0;
}
static int s5h1432_set_channel_bandwidth(struct dvb_frontend *fe,
u32 bandwidth)
{
struct s5h1432_state *state = fe->demodulator_priv;
u8 reg = 0;
/* Register [0x2E] bit 3:2 : 8MHz = 0; 7MHz = 1; 6MHz = 2 */
reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x2E);
reg &= ~(0x0C);
switch (bandwidth) {
case 6:
reg |= 0x08;
break;
case 7:
reg |= 0x04;
break;
case 8:
reg |= 0x00;
break;
default:
return 0;
}
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2E, reg);
return 1;
}
static int s5h1432_set_IF(struct dvb_frontend *fe, u32 ifFreqHz)
{
struct s5h1432_state *state = fe->demodulator_priv;
switch (ifFreqHz) {
case TAIWAN_HI_IF_FREQ_44_MHZ:
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x15);
break;
case EUROPE_HI_IF_FREQ_36_MHZ:
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x40);
break;
case IF_FREQ_6_MHZ:
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xe0);
break;
case IF_FREQ_3point3_MHZ:
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
break;
case IF_FREQ_3point5_MHZ:
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xED);
break;
case IF_FREQ_4_MHZ:
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0xAA);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0xAA);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEA);
break;
default:
{
u32 value = 0;
value = (u32) (((48000 - (ifFreqHz / 1000)) * 512 *
(u32) 32768) / (48 * 1000));
printk(KERN_INFO
"Default IFFreq %d :reg value = 0x%x\n",
ifFreqHz, value);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4,
(u8) value & 0xFF);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5,
(u8) (value >> 8) & 0xFF);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7,
(u8) (value >> 16) & 0xFF);
break;
}
}
return 1;
}
/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
static int s5h1432_set_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
u32 dvb_bandwidth = 8;
struct s5h1432_state *state = fe->demodulator_priv;
if (p->frequency == state->current_frequency) {
/*current_frequency = p->frequency; */
/*state->current_frequency = p->frequency; */
} else {
fe->ops.tuner_ops.set_params(fe);
msleep(300);
s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
switch (p->bandwidth_hz) {
case 6000000:
dvb_bandwidth = 6;
s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
break;
case 7000000:
dvb_bandwidth = 7;
s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
break;
case 8000000:
dvb_bandwidth = 8;
s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
break;
default:
return 0;
}
/*fe->ops.tuner_ops.set_params(fe); */
/*Soft Reset chip*/
msleep(30);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
msleep(30);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
switch (p->bandwidth_hz) {
case 6000000:
dvb_bandwidth = 6;
s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
break;
case 7000000:
dvb_bandwidth = 7;
s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
break;
case 8000000:
dvb_bandwidth = 8;
s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
break;
default:
return 0;
}
/*fe->ops.tuner_ops.set_params(fe); */
/*Soft Reset chip*/
msleep(30);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
msleep(30);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
}
state->current_frequency = p->frequency;
return 0;
}
static int s5h1432_init(struct dvb_frontend *fe)
{
struct s5h1432_state *state = fe->demodulator_priv;
u8 reg = 0;
state->current_frequency = 0;
printk(KERN_INFO " s5h1432_init().\n");
/*Set VSB mode as default, this also does a soft reset */
/*Initialize registers */
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x04, 0xa8);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x05, 0x01);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x07, 0x70);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x19, 0x80);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1b, 0x9D);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1c, 0x30);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1d, 0x20);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x1B);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2e, 0x40);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, 0x84);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x50, 0x5a);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x5a, 0xd3);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x68, 0x50);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xb8, 0x3c);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xc4, 0x10);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xcc, 0x9c);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xDA, 0x00);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe1, 0x94);
/* s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf4, 0xa1); */
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf9, 0x00);
/*For NXP tuner*/
/*Set 3.3MHz as default IF frequency */
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
/* Set reg 0x1E to get the full dynamic range */
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x31);
/* Mode setting in demod */
reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x42);
reg |= 0x80;
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, reg);
/* Serial mode */
/* Soft Reset chip */
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
msleep(30);
s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
return 0;
}
static int s5h1432_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
return 0;
}
static int s5h1432_read_signal_strength(struct dvb_frontend *fe,
u16 *signal_strength)
{
return 0;
}
static int s5h1432_read_snr(struct dvb_frontend *fe, u16 *snr)
{
return 0;
}
static int s5h1432_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
return 0;
}
static int s5h1432_read_ber(struct dvb_frontend *fe, u32 *ber)
{
return 0;
}
static int s5h1432_get_tune_settings(struct dvb_frontend *fe,
struct dvb_frontend_tune_settings *tune)
{
return 0;
}
static void s5h1432_release(struct dvb_frontend *fe)
{
struct s5h1432_state *state = fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops s5h1432_ops;
struct dvb_frontend *s5h1432_attach(const struct s5h1432_config *config,
struct i2c_adapter *i2c)
{
struct s5h1432_state *state = NULL;
printk(KERN_INFO " Enter s5h1432_attach(). attach success!\n");
/* allocate memory for the internal state */
state = kmalloc(sizeof(struct s5h1432_state), GFP_KERNEL);
if (!state)
return NULL;
/* setup the state */
state->config = config;
state->i2c = i2c;
state->current_modulation = QAM_16;
state->inversion = state->config->inversion;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &s5h1432_ops,
sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
}
EXPORT_SYMBOL(s5h1432_attach);
static struct dvb_frontend_ops s5h1432_ops = {
.delsys = { SYS_DVBT },
.info = {
.name = "Samsung s5h1432 DVB-T Frontend",
.frequency_min = 177000000,
.frequency_max = 858000000,
.frequency_stepsize = 166666,
.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_QAM_AUTO |
FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER},
.init = s5h1432_init,
.sleep = s5h1432_sleep,
.set_frontend = s5h1432_set_frontend,
.get_tune_settings = s5h1432_get_tune_settings,
.read_status = s5h1432_read_status,
.read_ber = s5h1432_read_ber,
.read_signal_strength = s5h1432_read_signal_strength,
.read_snr = s5h1432_read_snr,
.read_ucblocks = s5h1432_read_ucblocks,
.release = s5h1432_release,
};
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable verbose debug messages");
MODULE_DESCRIPTION("Samsung s5h1432 DVB-T Demodulator driver");
MODULE_AUTHOR("Bill Liu");
MODULE_LICENSE("GPL");
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