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linuxdebug/drivers/media/tuners/it913x.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ITE IT913X silicon tuner driver
*
* Copyright (C) 2011 Malcolm Priestley (tvboxspy@gmail.com)
* IT9137 Copyright (C) ITE Tech Inc.
*/
#include "it913x.h"
#include <linux/platform_device.h>
#include <linux/regmap.h>
struct it913x_dev {
struct platform_device *pdev;
struct regmap *regmap;
struct dvb_frontend *fe;
u8 chip_ver:2;
u8 role:2;
u16 xtal;
u8 fdiv;
u8 clk_mode;
u32 fn_min;
bool active;
};
static int it913x_init(struct dvb_frontend *fe)
{
struct it913x_dev *dev = fe->tuner_priv;
struct platform_device *pdev = dev->pdev;
int ret;
unsigned int utmp;
u8 iqik_m_cal, nv_val, buf[2];
static const u8 nv[] = {48, 32, 24, 16, 12, 8, 6, 4, 2};
unsigned long timeout;
dev_dbg(&pdev->dev, "role %u\n", dev->role);
ret = regmap_write(dev->regmap, 0x80ec4c, 0x68);
if (ret)
goto err;
usleep_range(10000, 100000);
ret = regmap_read(dev->regmap, 0x80ec86, &utmp);
if (ret)
goto err;
switch (utmp) {
case 0:
/* 12.000 MHz */
dev->clk_mode = utmp;
dev->xtal = 2000;
dev->fdiv = 3;
iqik_m_cal = 16;
break;
case 1:
/* 20.480 MHz */
dev->clk_mode = utmp;
dev->xtal = 640;
dev->fdiv = 1;
iqik_m_cal = 6;
break;
default:
dev_err(&pdev->dev, "unknown clock identifier %d\n", utmp);
ret = -EINVAL;
goto err;
}
ret = regmap_read(dev->regmap, 0x80ed03, &utmp);
if (ret)
goto err;
else if (utmp < ARRAY_SIZE(nv))
nv_val = nv[utmp];
else
nv_val = 2;
#define TIMEOUT 50
timeout = jiffies + msecs_to_jiffies(TIMEOUT);
while (!time_after(jiffies, timeout)) {
ret = regmap_bulk_read(dev->regmap, 0x80ed23, buf, 2);
if (ret)
goto err;
utmp = (buf[1] << 8) | (buf[0] << 0);
if (utmp)
break;
}
dev_dbg(&pdev->dev, "r_fbc_m_bdry took %u ms, val %u\n",
jiffies_to_msecs(jiffies) -
(jiffies_to_msecs(timeout) - TIMEOUT), utmp);
dev->fn_min = dev->xtal * utmp;
dev->fn_min /= (dev->fdiv * nv_val);
dev->fn_min *= 1000;
dev_dbg(&pdev->dev, "fn_min %u\n", dev->fn_min);
/*
* Chip version BX never sets that flag so we just wait 50ms in that
* case. It is possible poll BX similarly than AX and then timeout in
* order to get 50ms delay, but that causes about 120 extra I2C
* messages. As for now, we just wait and reduce IO.
*/
if (dev->chip_ver == 1) {
#define TIMEOUT 50
timeout = jiffies + msecs_to_jiffies(TIMEOUT);
while (!time_after(jiffies, timeout)) {
ret = regmap_read(dev->regmap, 0x80ec82, &utmp);
if (ret)
goto err;
if (utmp)
break;
}
dev_dbg(&pdev->dev, "p_tsm_init_mode took %u ms, val %u\n",
jiffies_to_msecs(jiffies) -
(jiffies_to_msecs(timeout) - TIMEOUT), utmp);
} else {
msleep(50);
}
ret = regmap_write(dev->regmap, 0x80ed81, iqik_m_cal);
if (ret)
goto err;
ret = regmap_write(dev->regmap, 0x80ec57, 0x00);
if (ret)
goto err;
ret = regmap_write(dev->regmap, 0x80ec58, 0x00);
if (ret)
goto err;
ret = regmap_write(dev->regmap, 0x80ec40, 0x01);
if (ret)
goto err;
dev->active = true;
return 0;
err:
dev_dbg(&pdev->dev, "failed %d\n", ret);
return ret;
}
static int it913x_sleep(struct dvb_frontend *fe)
{
struct it913x_dev *dev = fe->tuner_priv;
struct platform_device *pdev = dev->pdev;
int ret, len;
dev_dbg(&pdev->dev, "role %u\n", dev->role);
dev->active = false;
ret = regmap_bulk_write(dev->regmap, 0x80ec40, "\x00", 1);
if (ret)
goto err;
/*
* Writing '0x00' to master tuner register '0x80ec08' causes slave tuner
* communication lost. Due to that, we cannot put master full sleep.
*/
if (dev->role == IT913X_ROLE_DUAL_MASTER)
len = 4;
else
len = 15;
dev_dbg(&pdev->dev, "role %u, len %d\n", dev->role, len);
ret = regmap_bulk_write(dev->regmap, 0x80ec02,
"\x3f\x1f\x3f\x3e\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
len);
if (ret)
goto err;
ret = regmap_bulk_write(dev->regmap, 0x80ec12, "\x00\x00\x00\x00", 4);
if (ret)
goto err;
ret = regmap_bulk_write(dev->regmap, 0x80ec17,
"\x00\x00\x00\x00\x00\x00\x00\x00\x00", 9);
if (ret)
goto err;
ret = regmap_bulk_write(dev->regmap, 0x80ec22,
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 10);
if (ret)
goto err;
ret = regmap_bulk_write(dev->regmap, 0x80ec20, "\x00", 1);
if (ret)
goto err;
ret = regmap_bulk_write(dev->regmap, 0x80ec3f, "\x01", 1);
if (ret)
goto err;
return 0;
err:
dev_dbg(&pdev->dev, "failed %d\n", ret);
return ret;
}
static int it913x_set_params(struct dvb_frontend *fe)
{
struct it913x_dev *dev = fe->tuner_priv;
struct platform_device *pdev = dev->pdev;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret;
unsigned int utmp;
u32 pre_lo_freq, t_cal_freq;
u16 iqik_m_cal, n_div;
u8 u8tmp, n, l_band, lna_band;
dev_dbg(&pdev->dev, "role=%u, frequency %u, bandwidth_hz %u\n",
dev->role, c->frequency, c->bandwidth_hz);
if (!dev->active) {
ret = -EINVAL;
goto err;
}
if (c->frequency <= 74000000) {
n_div = 48;
n = 0;
} else if (c->frequency <= 111000000) {
n_div = 32;
n = 1;
} else if (c->frequency <= 148000000) {
n_div = 24;
n = 2;
} else if (c->frequency <= 222000000) {
n_div = 16;
n = 3;
} else if (c->frequency <= 296000000) {
n_div = 12;
n = 4;
} else if (c->frequency <= 445000000) {
n_div = 8;
n = 5;
} else if (c->frequency <= dev->fn_min) {
n_div = 6;
n = 6;
} else if (c->frequency <= 950000000) {
n_div = 4;
n = 7;
} else {
n_div = 2;
n = 0;
}
ret = regmap_read(dev->regmap, 0x80ed81, &utmp);
if (ret)
goto err;
iqik_m_cal = utmp * n_div;
if (utmp < 0x20) {
if (dev->clk_mode == 0)
iqik_m_cal = (iqik_m_cal * 9) >> 5;
else
iqik_m_cal >>= 1;
} else {
iqik_m_cal = 0x40 - iqik_m_cal;
if (dev->clk_mode == 0)
iqik_m_cal = ~((iqik_m_cal * 9) >> 5);
else
iqik_m_cal = ~(iqik_m_cal >> 1);
}
t_cal_freq = (c->frequency / 1000) * n_div * dev->fdiv;
pre_lo_freq = t_cal_freq / dev->xtal;
utmp = pre_lo_freq * dev->xtal;
if ((t_cal_freq - utmp) >= (dev->xtal >> 1))
pre_lo_freq++;
pre_lo_freq += (u32) n << 13;
/* Frequency OMEGA_IQIK_M_CAL_MID*/
t_cal_freq = pre_lo_freq + (u32)iqik_m_cal;
dev_dbg(&pdev->dev, "t_cal_freq %u, pre_lo_freq %u\n",
t_cal_freq, pre_lo_freq);
if (c->frequency <= 440000000) {
l_band = 0;
lna_band = 0;
} else if (c->frequency <= 484000000) {
l_band = 1;
lna_band = 1;
} else if (c->frequency <= 533000000) {
l_band = 1;
lna_band = 2;
} else if (c->frequency <= 587000000) {
l_band = 1;
lna_band = 3;
} else if (c->frequency <= 645000000) {
l_band = 1;
lna_band = 4;
} else if (c->frequency <= 710000000) {
l_band = 1;
lna_band = 5;
} else if (c->frequency <= 782000000) {
l_band = 1;
lna_band = 6;
} else if (c->frequency <= 860000000) {
l_band = 1;
lna_band = 7;
} else if (c->frequency <= 1492000000) {
l_band = 1;
lna_band = 0;
} else if (c->frequency <= 1685000000) {
l_band = 1;
lna_band = 1;
} else {
ret = -EINVAL;
goto err;
}
/* XXX: latest windows driver does not set that at all */
ret = regmap_write(dev->regmap, 0x80ee06, lna_band);
if (ret)
goto err;
if (c->bandwidth_hz <= 5000000)
u8tmp = 0;
else if (c->bandwidth_hz <= 6000000)
u8tmp = 2;
else if (c->bandwidth_hz <= 7000000)
u8tmp = 4;
else
u8tmp = 6; /* 8000000 */
ret = regmap_write(dev->regmap, 0x80ec56, u8tmp);
if (ret)
goto err;
/* XXX: latest windows driver sets different value (a8 != 68) */
ret = regmap_write(dev->regmap, 0x80ec4c, 0xa0 | (l_band << 3));
if (ret)
goto err;
ret = regmap_write(dev->regmap, 0x80ec4d, (t_cal_freq >> 0) & 0xff);
if (ret)
goto err;
ret = regmap_write(dev->regmap, 0x80ec4e, (t_cal_freq >> 8) & 0xff);
if (ret)
goto err;
ret = regmap_write(dev->regmap, 0x80011e, (pre_lo_freq >> 0) & 0xff);
if (ret)
goto err;
ret = regmap_write(dev->regmap, 0x80011f, (pre_lo_freq >> 8) & 0xff);
if (ret)
goto err;
return 0;
err:
dev_dbg(&pdev->dev, "failed %d\n", ret);
return ret;
}
static const struct dvb_tuner_ops it913x_tuner_ops = {
.info = {
.name = "ITE IT913X",
.frequency_min_hz = 174 * MHz,
.frequency_max_hz = 862 * MHz,
},
.init = it913x_init,
.sleep = it913x_sleep,
.set_params = it913x_set_params,
};
static int it913x_probe(struct platform_device *pdev)
{
struct it913x_platform_data *pdata = pdev->dev.platform_data;
struct dvb_frontend *fe = pdata->fe;
struct it913x_dev *dev;
const struct platform_device_id *id = platform_get_device_id(pdev);
int ret;
char *chip_ver_str;
dev = kzalloc(sizeof(struct it913x_dev), GFP_KERNEL);
if (dev == NULL) {
ret = -ENOMEM;
dev_err(&pdev->dev, "kzalloc() failed\n");
goto err;
}
dev->pdev = pdev;
dev->regmap = pdata->regmap;
dev->fe = pdata->fe;
dev->chip_ver = id->driver_data;
dev->role = pdata->role;
fe->tuner_priv = dev;
memcpy(&fe->ops.tuner_ops, &it913x_tuner_ops,
sizeof(struct dvb_tuner_ops));
platform_set_drvdata(pdev, dev);
if (dev->chip_ver == 1)
chip_ver_str = "AX";
else if (dev->chip_ver == 2)
chip_ver_str = "BX";
else
chip_ver_str = "??";
dev_info(&pdev->dev, "ITE IT913X %s successfully attached\n",
chip_ver_str);
dev_dbg(&pdev->dev, "chip_ver %u, role %u\n", dev->chip_ver, dev->role);
return 0;
err:
dev_dbg(&pdev->dev, "failed %d\n", ret);
return ret;
}
static int it913x_remove(struct platform_device *pdev)
{
struct it913x_dev *dev = platform_get_drvdata(pdev);
struct dvb_frontend *fe = dev->fe;
dev_dbg(&pdev->dev, "\n");
memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
fe->tuner_priv = NULL;
kfree(dev);
return 0;
}
static const struct platform_device_id it913x_id_table[] = {
{"it9133ax-tuner", 1},
{"it9133bx-tuner", 2},
{},
};
MODULE_DEVICE_TABLE(platform, it913x_id_table);
static struct platform_driver it913x_driver = {
.driver = {
.name = "it913x",
.suppress_bind_attrs = true,
},
.probe = it913x_probe,
.remove = it913x_remove,
.id_table = it913x_id_table,
};
module_platform_driver(it913x_driver);
MODULE_DESCRIPTION("ITE IT913X silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_LICENSE("GPL");