| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * ZyDAS ZD1301 driver (demodulator) |
| * |
| * Copyright (C) 2015 Antti Palosaari <crope@iki.fi> |
| */ |
| |
| #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; |
| 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 */ |
| strscpy(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"); |
