diff options
Diffstat (limited to 'drivers/media/dvb-frontends/zd1301_demod.c')
| -rw-r--r-- | drivers/media/dvb-frontends/zd1301_demod.c | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/zd1301_demod.c b/drivers/media/dvb-frontends/zd1301_demod.c new file mode 100644 index 000000000..84a2b25a5 --- /dev/null +++ b/drivers/media/dvb-frontends/zd1301_demod.c @@ -0,0 +1,551 @@ +/* + * 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"); |