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linux-next/drivers/media/dvb-frontends/zd1301_demod.c
Gustavo A. R. Silva c51df136e5 media: zd1301_demod: constify i2c_algorithm structure 
Check for i2c_algorithm structures that are only stored in
the algo field of an i2c_adapter structure. This field is
declared const, so i2c_algorithm structures that have this
property can be declared as const also.

This issue was identified using Coccinelle and the following
semantic patch:

@r disable optional_qualifier@
identifier i;
position p;
@@
static struct i2c_algorithm i@p = { ... };

@ok@
identifier r.i;
struct i2c_adapter e;
position p;
@@
e.algo = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct i2c_algorithm i = { ... };

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-07-20 14:58:10 -04:00

552 lines
13 KiB
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/*
* ZyDAS ZD1301 driver (demodulator)
*
* Copyright (C) 2015 Antti Palosaari <crope@iki.fi>
*
* 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.
*/
#include "zd1301_demod.h"
static u8 zd1301_demod_gain = 0x38;
module_param_named(gain, zd1301_demod_gain, byte, 0644);
MODULE_PARM_DESC(gain, "gain (value: 0x00 - 0x70, default: 0x38)");
struct zd1301_demod_dev {
struct platform_device *pdev;
struct dvb_frontend frontend;
struct i2c_adapter adapter;
u8 gain;
};
static int zd1301_demod_wreg(struct zd1301_demod_dev *dev, u16 reg, u8 val)
{
struct platform_device *pdev = dev->pdev;
struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;
return pdata->reg_write(pdata->reg_priv, reg, val);
}
static int zd1301_demod_rreg(struct zd1301_demod_dev *dev, u16 reg, u8 *val)
{
struct platform_device *pdev = dev->pdev;
struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;
return pdata->reg_read(pdata->reg_priv, reg, val);
}
static int zd1301_demod_set_frontend(struct dvb_frontend *fe)
{
struct zd1301_demod_dev *dev = fe->demodulator_priv;
struct platform_device *pdev = dev->pdev;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret;
u32 if_frequency;
u8 r6a50_val;
dev_dbg(&pdev->dev, "frequency=%u bandwidth_hz=%u\n",
c->frequency, c->bandwidth_hz);
/* Program tuner */
if (fe->ops.tuner_ops.set_params &&
fe->ops.tuner_ops.get_if_frequency) {
ret = fe->ops.tuner_ops.set_params(fe);
if (ret)
goto err;
ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_frequency);
if (ret)
goto err;
} else {
ret = -EINVAL;
goto err;
}
dev_dbg(&pdev->dev, "if_frequency=%u\n", if_frequency);
if (if_frequency != 36150000) {
ret = -EINVAL;
goto err;
}
switch (c->bandwidth_hz) {
case 6000000:
r6a50_val = 0x78;
break;
case 7000000:
r6a50_val = 0x68;
break;
case 8000000:
r6a50_val = 0x58;
break;
default:
ret = -EINVAL;
goto err;
}
ret = zd1301_demod_wreg(dev, 0x6a60, 0x11);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a47, 0x46);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a48, 0x46);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a4a, 0x15);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a4b, 0x63);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a5b, 0x99);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a3b, 0x10);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6806, 0x01);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a41, 0x08);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a42, 0x46);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a44, 0x14);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a45, 0x67);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a38, 0x00);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a4c, 0x52);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a49, 0x2a);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6840, 0x2e);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a50, r6a50_val);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a38, 0x07);
if (ret)
goto err;
return 0;
err:
dev_dbg(&pdev->dev, "failed=%d\n", ret);
return ret;
}
static int zd1301_demod_sleep(struct dvb_frontend *fe)
{
struct zd1301_demod_dev *dev = fe->demodulator_priv;
struct platform_device *pdev = dev->pdev;
int ret;
dev_dbg(&pdev->dev, "\n");
ret = zd1301_demod_wreg(dev, 0x6a43, 0x70);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x684e, 0x00);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6849, 0x00);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x68e2, 0xd7);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x68e0, 0x39);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6840, 0x21);
if (ret)
goto err;
return 0;
err:
dev_dbg(&pdev->dev, "failed=%d\n", ret);
return ret;
}
static int zd1301_demod_init(struct dvb_frontend *fe)
{
struct zd1301_demod_dev *dev = fe->demodulator_priv;
struct platform_device *pdev = dev->pdev;
int ret;
dev_dbg(&pdev->dev, "\n");
ret = zd1301_demod_wreg(dev, 0x6840, 0x26);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x68e0, 0xff);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x68e2, 0xd8);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6849, 0x4e);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x684e, 0x01);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6a43, zd1301_demod_gain);
if (ret)
goto err;
return 0;
err:
dev_dbg(&pdev->dev, "failed=%d\n", ret);
return ret;
}
static int zd1301_demod_get_tune_settings(struct dvb_frontend *fe,
struct dvb_frontend_tune_settings *settings)
{
struct zd1301_demod_dev *dev = fe->demodulator_priv;
struct platform_device *pdev = dev->pdev;
dev_dbg(&pdev->dev, "\n");
/* ~180ms seems to be enough */
settings->min_delay_ms = 400;
return 0;
}
static int zd1301_demod_read_status(struct dvb_frontend *fe,
enum fe_status *status)
{
struct zd1301_demod_dev *dev = fe->demodulator_priv;
struct platform_device *pdev = dev->pdev;
int ret;
u8 u8tmp;
ret = zd1301_demod_rreg(dev, 0x6a24, &u8tmp);
if (ret)
goto err;
if (u8tmp > 0x00 && u8tmp < 0x20)
*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
FE_HAS_SYNC | FE_HAS_LOCK;
else
*status = 0;
dev_dbg(&pdev->dev, "lock byte=%02x\n", u8tmp);
/*
* Interesting registers here are:
* 0x6a05: get some gain value
* 0x6a06: get about same gain value than set to 0x6a43
* 0x6a07: get some gain value
* 0x6a43: set gain value by driver
* 0x6a24: get demod lock bits (FSM stage?)
*
* Driver should implement some kind of algorithm to calculate suitable
* value for register 0x6a43, based likely values from register 0x6a05
* and 0x6a07. Looks like gain register 0x6a43 value could be from
* range 0x00 - 0x70.
*/
if (dev->gain != zd1301_demod_gain) {
dev->gain = zd1301_demod_gain;
ret = zd1301_demod_wreg(dev, 0x6a43, dev->gain);
if (ret)
goto err;
}
return 0;
err:
dev_dbg(&pdev->dev, "failed=%d\n", ret);
return ret;
}
static const struct dvb_frontend_ops zd1301_demod_ops = {
.delsys = {SYS_DVBT},
.info = {
.name = "ZyDAS ZD1301",
.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_TRANSMISSION_MODE_AUTO |
FE_CAN_GUARD_INTERVAL_AUTO |
FE_CAN_HIERARCHY_AUTO |
FE_CAN_MUTE_TS
},
.sleep = zd1301_demod_sleep,
.init = zd1301_demod_init,
.set_frontend = zd1301_demod_set_frontend,
.get_tune_settings = zd1301_demod_get_tune_settings,
.read_status = zd1301_demod_read_status,
};
struct dvb_frontend *zd1301_demod_get_dvb_frontend(struct platform_device *pdev)
{
struct zd1301_demod_dev *dev = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "\n");
return &dev->frontend;
}
EXPORT_SYMBOL(zd1301_demod_get_dvb_frontend);
static int zd1301_demod_i2c_master_xfer(struct i2c_adapter *adapter,
struct i2c_msg msg[], int num)
{
struct zd1301_demod_dev *dev = i2c_get_adapdata(adapter);
struct platform_device *pdev = dev->pdev;
int ret, i;
unsigned long timeout;
u8 u8tmp;
#define I2C_XFER_TIMEOUT 5
#define ZD1301_IS_I2C_XFER_WRITE_READ(_msg, _num) \
(_num == 2 && !(_msg[0].flags & I2C_M_RD) && (_msg[1].flags & I2C_M_RD))
#define ZD1301_IS_I2C_XFER_WRITE(_msg, _num) \
(_num == 1 && !(_msg[0].flags & I2C_M_RD))
#define ZD1301_IS_I2C_XFER_READ(_msg, _num) \
(_num == 1 && (_msg[0].flags & I2C_M_RD))
if (ZD1301_IS_I2C_XFER_WRITE_READ(msg, num)) {
dev_dbg(&pdev->dev, "write&read msg[0].len=%u msg[1].len=%u\n",
msg[0].len, msg[1].len);
if (msg[0].len > 1 || msg[1].len > 8) {
ret = -EOPNOTSUPP;
goto err;
}
ret = zd1301_demod_wreg(dev, 0x6811, 0x80);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6812, 0x05);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6813, msg[1].addr << 1);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6801, msg[0].buf[0]);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6802, 0x00);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6803, 0x06);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6805, 0x00);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6804, msg[1].len);
if (ret)
goto err;
/* Poll xfer ready */
timeout = jiffies + msecs_to_jiffies(I2C_XFER_TIMEOUT);
for (u8tmp = 1; !time_after(jiffies, timeout) && u8tmp;) {
usleep_range(500, 800);
ret = zd1301_demod_rreg(dev, 0x6804, &u8tmp);
if (ret)
goto err;
}
for (i = 0; i < msg[1].len; i++) {
ret = zd1301_demod_rreg(dev, 0x0600 + i, &msg[1].buf[i]);
if (ret)
goto err;
}
} else if (ZD1301_IS_I2C_XFER_WRITE(msg, num)) {
dev_dbg(&pdev->dev, "write msg[0].len=%u\n", msg[0].len);
if (msg[0].len > 1 + 8) {
ret = -EOPNOTSUPP;
goto err;
}
ret = zd1301_demod_wreg(dev, 0x6811, 0x80);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6812, 0x01);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6813, msg[0].addr << 1);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6800, msg[0].buf[0]);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6802, 0x00);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6803, 0x06);
if (ret)
goto err;
for (i = 0; i < msg[0].len - 1; i++) {
ret = zd1301_demod_wreg(dev, 0x0600 + i, msg[0].buf[1 + i]);
if (ret)
goto err;
}
ret = zd1301_demod_wreg(dev, 0x6805, 0x80);
if (ret)
goto err;
ret = zd1301_demod_wreg(dev, 0x6804, msg[0].len - 1);
if (ret)
goto err;
/* Poll xfer ready */
timeout = jiffies + msecs_to_jiffies(I2C_XFER_TIMEOUT);
for (u8tmp = 1; !time_after(jiffies, timeout) && u8tmp;) {
usleep_range(500, 800);
ret = zd1301_demod_rreg(dev, 0x6804, &u8tmp);
if (ret)
goto err;
}
} else {
dev_dbg(&pdev->dev, "unknown msg[0].len=%u\n", msg[0].len);
ret = -EOPNOTSUPP;
if (ret)
goto err;
}
return num;
err:
dev_dbg(&pdev->dev, "failed=%d\n", ret);
return ret;
}
static u32 zd1301_demod_i2c_functionality(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C;
}
static const struct i2c_algorithm zd1301_demod_i2c_algorithm = {
.master_xfer = zd1301_demod_i2c_master_xfer,
.functionality = zd1301_demod_i2c_functionality,
};
struct i2c_adapter *zd1301_demod_get_i2c_adapter(struct platform_device *pdev)
{
struct zd1301_demod_dev *dev = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "\n");
return &dev->adapter;
}
EXPORT_SYMBOL(zd1301_demod_get_i2c_adapter);
/* Platform driver interface */
static int zd1301_demod_probe(struct platform_device *pdev)
{
struct zd1301_demod_dev *dev;
struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;
int ret;
dev_dbg(&pdev->dev, "\n");
if (!pdata) {
ret = -EINVAL;
dev_err(&pdev->dev, "cannot proceed without platform data\n");
goto err;
}
if (!pdev->dev.parent->driver) {
ret = -EINVAL;
dev_dbg(&pdev->dev, "no parent device\n");
goto err;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
ret = -ENOMEM;
goto err;
}
/* Setup the state */
dev->pdev = pdev;
dev->gain = zd1301_demod_gain;
/* Sleep */
ret = zd1301_demod_wreg(dev, 0x6840, 0x21);
if (ret)
goto err_kfree;
ret = zd1301_demod_wreg(dev, 0x6a38, 0x07);
if (ret)
goto err_kfree;
/* Create I2C adapter */
strlcpy(dev->adapter.name, "ZyDAS ZD1301 demod", sizeof(dev->adapter.name));
dev->adapter.algo = &zd1301_demod_i2c_algorithm;
dev->adapter.algo_data = NULL;
dev->adapter.dev.parent = pdev->dev.parent;
i2c_set_adapdata(&dev->adapter, dev);
ret = i2c_add_adapter(&dev->adapter);
if (ret) {
dev_err(&pdev->dev, "I2C adapter add failed %d\n", ret);
goto err_kfree;
}
/* Create dvb frontend */
memcpy(&dev->frontend.ops, &zd1301_demod_ops, sizeof(dev->frontend.ops));
dev->frontend.demodulator_priv = dev;
platform_set_drvdata(pdev, dev);
dev_info(&pdev->dev, "ZyDAS ZD1301 demod attached\n");
return 0;
err_kfree:
kfree(dev);
err:
dev_dbg(&pdev->dev, "failed=%d\n", ret);
return ret;
}
static int zd1301_demod_remove(struct platform_device *pdev)
{
struct zd1301_demod_dev *dev = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "\n");
i2c_del_adapter(&dev->adapter);
kfree(dev);
return 0;
}
static struct platform_driver zd1301_demod_driver = {
.driver = {
.name = "zd1301_demod",
.suppress_bind_attrs = true,
},
.probe = zd1301_demod_probe,
.remove = zd1301_demod_remove,
};
module_platform_driver(zd1301_demod_driver);
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("ZyDAS ZD1301 demodulator driver");
MODULE_LICENSE("GPL");
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