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linux/drivers/media/dvb-frontends/s921.c
Peter Senna Tschudin 4a0543ee8d [media] drivers/media/dvb-frontends/s921.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 11:13:35 -03:00

545 lines
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/*
* Sharp VA3A5JZ921 One Seg Broadcast Module driver
* This device is labeled as just S. 921 at the top of the frontend can
*
* Copyright (C) 2009-2010 Mauro Carvalho Chehab <mchehab@redhat.com>
* Copyright (C) 2009-2010 Douglas Landgraf <dougsland@redhat.com>
*
* Developed for Leadership SBTVD 1seg device sold in Brazil
*
* Frontend module based on cx24123 driver, getting some info from
* the old s921 driver.
*
* FIXME: Need to port to DVB v5.2 API
*
* 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 version 2.
*
* 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.
*/
#include <linux/kernel.h>
#include <asm/div64.h>
#include "dvb_frontend.h"
#include "s921.h"
static int debug = 1;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
#define rc(args...) do { \
printk(KERN_ERR "s921: " args); \
} while (0)
#define dprintk(args...) \
do { \
if (debug) { \
printk(KERN_DEBUG "s921: %s: ", __func__); \
printk(args); \
} \
} while (0)
struct s921_state {
struct i2c_adapter *i2c;
const struct s921_config *config;
struct dvb_frontend frontend;
/* The Demod can't easily provide these, we cache them */
u32 currentfreq;
};
/*
* Various tuner defaults need to be established for a given frequency kHz.
* fixme: The bounds on the bands do not match the doc in real life.
* fixme: Some of them have been moved, other might need adjustment.
*/
static struct s921_bandselect_val {
u32 freq_low;
u8 band_reg;
} s921_bandselect[] = {
{ 0, 0x7b },
{ 485140000, 0x5b },
{ 515140000, 0x3b },
{ 545140000, 0x1b },
{ 599140000, 0xfb },
{ 623140000, 0xdb },
{ 659140000, 0xbb },
{ 713140000, 0x9b },
};
struct regdata {
u8 reg;
u8 data;
};
static struct regdata s921_init[] = {
{ 0x01, 0x80 }, /* Probably, a reset sequence */
{ 0x01, 0x40 },
{ 0x01, 0x80 },
{ 0x01, 0x40 },
{ 0x02, 0x00 },
{ 0x03, 0x40 },
{ 0x04, 0x01 },
{ 0x05, 0x00 },
{ 0x06, 0x00 },
{ 0x07, 0x00 },
{ 0x08, 0x00 },
{ 0x09, 0x00 },
{ 0x0a, 0x00 },
{ 0x0b, 0x5a },
{ 0x0c, 0x00 },
{ 0x0d, 0x00 },
{ 0x0f, 0x00 },
{ 0x13, 0x1b },
{ 0x14, 0x80 },
{ 0x15, 0x40 },
{ 0x17, 0x70 },
{ 0x18, 0x01 },
{ 0x19, 0x12 },
{ 0x1a, 0x01 },
{ 0x1b, 0x12 },
{ 0x1c, 0xa0 },
{ 0x1d, 0x00 },
{ 0x1e, 0x0a },
{ 0x1f, 0x08 },
{ 0x20, 0x40 },
{ 0x21, 0xff },
{ 0x22, 0x4c },
{ 0x23, 0x4e },
{ 0x24, 0x4c },
{ 0x25, 0x00 },
{ 0x26, 0x00 },
{ 0x27, 0xf4 },
{ 0x28, 0x60 },
{ 0x29, 0x88 },
{ 0x2a, 0x40 },
{ 0x2b, 0x40 },
{ 0x2c, 0xff },
{ 0x2d, 0x00 },
{ 0x2e, 0xff },
{ 0x2f, 0x00 },
{ 0x30, 0x20 },
{ 0x31, 0x06 },
{ 0x32, 0x0c },
{ 0x34, 0x0f },
{ 0x37, 0xfe },
{ 0x38, 0x00 },
{ 0x39, 0x63 },
{ 0x3a, 0x10 },
{ 0x3b, 0x10 },
{ 0x47, 0x00 },
{ 0x49, 0xe5 },
{ 0x4b, 0x00 },
{ 0x50, 0xc0 },
{ 0x52, 0x20 },
{ 0x54, 0x5a },
{ 0x55, 0x5b },
{ 0x56, 0x40 },
{ 0x57, 0x70 },
{ 0x5c, 0x50 },
{ 0x5d, 0x00 },
{ 0x62, 0x17 },
{ 0x63, 0x2f },
{ 0x64, 0x6f },
{ 0x68, 0x00 },
{ 0x69, 0x89 },
{ 0x6a, 0x00 },
{ 0x6b, 0x00 },
{ 0x6c, 0x00 },
{ 0x6d, 0x00 },
{ 0x6e, 0x00 },
{ 0x70, 0x10 },
{ 0x71, 0x00 },
{ 0x75, 0x00 },
{ 0x76, 0x30 },
{ 0x77, 0x01 },
{ 0xaf, 0x00 },
{ 0xb0, 0xa0 },
{ 0xb2, 0x3d },
{ 0xb3, 0x25 },
{ 0xb4, 0x8b },
{ 0xb5, 0x4b },
{ 0xb6, 0x3f },
{ 0xb7, 0xff },
{ 0xb8, 0xff },
{ 0xb9, 0xfc },
{ 0xba, 0x00 },
{ 0xbb, 0x00 },
{ 0xbc, 0x00 },
{ 0xd0, 0x30 },
{ 0xe4, 0x84 },
{ 0xf0, 0x48 },
{ 0xf1, 0x19 },
{ 0xf2, 0x5a },
{ 0xf3, 0x8e },
{ 0xf4, 0x2d },
{ 0xf5, 0x07 },
{ 0xf6, 0x5a },
{ 0xf7, 0xba },
{ 0xf8, 0xd7 },
};
static struct regdata s921_prefreq[] = {
{ 0x47, 0x60 },
{ 0x68, 0x00 },
{ 0x69, 0x89 },
{ 0xf0, 0x48 },
{ 0xf1, 0x19 },
};
static struct regdata s921_postfreq[] = {
{ 0xf5, 0xae },
{ 0xf6, 0xb7 },
{ 0xf7, 0xba },
{ 0xf8, 0xd7 },
{ 0x68, 0x0a },
{ 0x69, 0x09 },
};
static int s921_i2c_writereg(struct s921_state *state,
u8 i2c_addr, int reg, int data)
{
u8 buf[] = { reg, data };
struct i2c_msg msg = {
.addr = i2c_addr, .flags = 0, .buf = buf, .len = 2
};
int rc;
rc = i2c_transfer(state->i2c, &msg, 1);
if (rc != 1) {
printk("%s: writereg rcor(rc == %i, reg == 0x%02x,"
" data == 0x%02x)\n", __func__, rc, reg, data);
return rc;
}
return 0;
}
static int s921_i2c_writeregdata(struct s921_state *state, u8 i2c_addr,
struct regdata *rd, int size)
{
int i, rc;
for (i = 0; i < size; i++) {
rc = s921_i2c_writereg(state, i2c_addr, rd[i].reg, rd[i].data);
if (rc < 0)
return rc;
}
return 0;
}
static int s921_i2c_readreg(struct s921_state *state, u8 i2c_addr, u8 reg)
{
u8 val;
int rc;
struct i2c_msg msg[] = {
{ .addr = i2c_addr, .flags = 0, .buf = &reg, .len = 1 },
{ .addr = i2c_addr, .flags = I2C_M_RD, .buf = &val, .len = 1 }
};
rc = i2c_transfer(state->i2c, msg, 2);
if (rc != 2) {
rc("%s: reg=0x%x (rcor=%d)\n", __func__, reg, rc);
return rc;
}
return val;
}
#define s921_readreg(state, reg) \
s921_i2c_readreg(state, state->config->demod_address, reg)
#define s921_writereg(state, reg, val) \
s921_i2c_writereg(state, state->config->demod_address, reg, val)
#define s921_writeregdata(state, regdata) \
s921_i2c_writeregdata(state, state->config->demod_address, \
regdata, ARRAY_SIZE(regdata))
static int s921_pll_tune(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct s921_state *state = fe->demodulator_priv;
int band, rc, i;
unsigned long f_offset;
u8 f_switch;
u64 offset;
dprintk("frequency=%i\n", p->frequency);
for (band = 0; band < ARRAY_SIZE(s921_bandselect); band++)
if (p->frequency < s921_bandselect[band].freq_low)
break;
band--;
if (band < 0) {
rc("%s: frequency out of range\n", __func__);
return -EINVAL;
}
f_switch = s921_bandselect[band].band_reg;
offset = ((u64)p->frequency) * 258;
do_div(offset, 6000000);
f_offset = ((unsigned long)offset) + 2321;
rc = s921_writeregdata(state, s921_prefreq);
if (rc < 0)
return rc;
rc = s921_writereg(state, 0xf2, (f_offset >> 8) & 0xff);
if (rc < 0)
return rc;
rc = s921_writereg(state, 0xf3, f_offset & 0xff);
if (rc < 0)
return rc;
rc = s921_writereg(state, 0xf4, f_switch);
if (rc < 0)
return rc;
rc = s921_writeregdata(state, s921_postfreq);
if (rc < 0)
return rc;
for (i = 0 ; i < 6; i++) {
rc = s921_readreg(state, 0x80);
dprintk("status 0x80: %02x\n", rc);
}
rc = s921_writereg(state, 0x01, 0x40);
if (rc < 0)
return rc;
rc = s921_readreg(state, 0x01);
dprintk("status 0x01: %02x\n", rc);
rc = s921_readreg(state, 0x80);
dprintk("status 0x80: %02x\n", rc);
rc = s921_readreg(state, 0x80);
dprintk("status 0x80: %02x\n", rc);
rc = s921_readreg(state, 0x32);
dprintk("status 0x32: %02x\n", rc);
dprintk("pll tune band=%d, pll=%d\n", f_switch, (int)f_offset);
return 0;
}
static int s921_initfe(struct dvb_frontend *fe)
{
struct s921_state *state = fe->demodulator_priv;
int rc;
dprintk("\n");
rc = s921_writeregdata(state, s921_init);
if (rc < 0)
return rc;
return 0;
}
static int s921_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct s921_state *state = fe->demodulator_priv;
int regstatus, rc;
*status = 0;
rc = s921_readreg(state, 0x81);
if (rc < 0)
return rc;
regstatus = rc << 8;
rc = s921_readreg(state, 0x82);
if (rc < 0)
return rc;
regstatus |= rc;
dprintk("status = %04x\n", regstatus);
/* Full Sync - We don't know what each bit means on regs 0x81/0x82 */
if ((regstatus & 0xff) == 0x40) {
*status = FE_HAS_SIGNAL |
FE_HAS_CARRIER |
FE_HAS_VITERBI |
FE_HAS_SYNC |
FE_HAS_LOCK;
} else if (regstatus & 0x40) {
/* This is close to Full Sync, but not enough to get useful info */
*status = FE_HAS_SIGNAL |
FE_HAS_CARRIER |
FE_HAS_VITERBI |
FE_HAS_SYNC;
}
return 0;
}
static int s921_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
fe_status_t status;
struct s921_state *state = fe->demodulator_priv;
int rc;
/* FIXME: Use the proper register for it... 0x80? */
rc = s921_read_status(fe, &status);
if (rc < 0)
return rc;
*strength = (status & FE_HAS_LOCK) ? 0xffff : 0;
dprintk("strength = 0x%04x\n", *strength);
rc = s921_readreg(state, 0x01);
dprintk("status 0x01: %02x\n", rc);
rc = s921_readreg(state, 0x80);
dprintk("status 0x80: %02x\n", rc);
rc = s921_readreg(state, 0x32);
dprintk("status 0x32: %02x\n", rc);
return 0;
}
static int s921_set_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct s921_state *state = fe->demodulator_priv;
int rc;
dprintk("\n");
/* FIXME: We don't know how to use non-auto mode */
rc = s921_pll_tune(fe);
if (rc < 0)
return rc;
state->currentfreq = p->frequency;
return 0;
}
static int s921_get_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct s921_state *state = fe->demodulator_priv;
/* FIXME: Probably it is possible to get it from regs f1 and f2 */
p->frequency = state->currentfreq;
p->delivery_system = SYS_ISDBT;
return 0;
}
static int s921_tune(struct dvb_frontend *fe,
bool re_tune,
unsigned int mode_flags,
unsigned int *delay,
fe_status_t *status)
{
int rc = 0;
dprintk("\n");
if (re_tune)
rc = s921_set_frontend(fe);
if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
s921_read_status(fe, status);
return rc;
}
static int s921_get_algo(struct dvb_frontend *fe)
{
return 1; /* FE_ALGO_HW */
}
static void s921_release(struct dvb_frontend *fe)
{
struct s921_state *state = fe->demodulator_priv;
dprintk("\n");
kfree(state);
}
static struct dvb_frontend_ops s921_ops;
struct dvb_frontend *s921_attach(const struct s921_config *config,
struct i2c_adapter *i2c)
{
/* allocate memory for the internal state */
struct s921_state *state =
kzalloc(sizeof(struct s921_state), GFP_KERNEL);
dprintk("\n");
if (!state) {
rc("Unable to kzalloc\n");
return NULL;
}
/* setup the state */
state->config = config;
state->i2c = i2c;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &s921_ops,
sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
}
EXPORT_SYMBOL(s921_attach);
static struct dvb_frontend_ops s921_ops = {
.delsys = { SYS_ISDBT },
/* Use dib8000 values per default */
.info = {
.name = "Sharp S921",
.frequency_min = 470000000,
/*
* Max should be 770MHz instead, according with Sharp docs,
* but Leadership doc says it works up to 806 MHz. This is
* required to get channel 69, used in Brazil
*/
.frequency_max = 806000000,
.frequency_tolerance = 0,
.caps = FE_CAN_INVERSION_AUTO |
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_TRANSMISSION_MODE_AUTO |
FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_RECOVER |
FE_CAN_HIERARCHY_AUTO,
},
.release = s921_release,
.init = s921_initfe,
.set_frontend = s921_set_frontend,
.get_frontend = s921_get_frontend,
.read_status = s921_read_status,
.read_signal_strength = s921_read_signal_strength,
.tune = s921_tune,
.get_frontend_algo = s921_get_algo,
};
MODULE_DESCRIPTION("DVB Frontend module for Sharp S921 hardware");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_AUTHOR("Douglas Landgraf <dougsland@redhat.com>");
MODULE_LICENSE("GPL");
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