552 lines
13 KiB
C
552 lines
13 KiB
C
/*
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* ZyDAS ZD1301 driver (demodulator)
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*
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* Copyright (C) 2015 Antti Palosaari <crope@iki.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "zd1301_demod.h"
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static u8 zd1301_demod_gain = 0x38;
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module_param_named(gain, zd1301_demod_gain, byte, 0644);
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MODULE_PARM_DESC(gain, "gain (value: 0x00 - 0x70, default: 0x38)");
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struct zd1301_demod_dev {
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struct platform_device *pdev;
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struct dvb_frontend frontend;
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struct i2c_adapter adapter;
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u8 gain;
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};
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static int zd1301_demod_wreg(struct zd1301_demod_dev *dev, u16 reg, u8 val)
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{
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struct platform_device *pdev = dev->pdev;
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struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;
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return pdata->reg_write(pdata->reg_priv, reg, val);
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}
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static int zd1301_demod_rreg(struct zd1301_demod_dev *dev, u16 reg, u8 *val)
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{
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struct platform_device *pdev = dev->pdev;
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struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;
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return pdata->reg_read(pdata->reg_priv, reg, val);
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}
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static int zd1301_demod_set_frontend(struct dvb_frontend *fe)
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{
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struct zd1301_demod_dev *dev = fe->demodulator_priv;
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struct platform_device *pdev = dev->pdev;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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int ret;
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u32 if_frequency;
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u8 r6a50_val;
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dev_dbg(&pdev->dev, "frequency=%u bandwidth_hz=%u\n",
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c->frequency, c->bandwidth_hz);
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/* Program tuner */
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if (fe->ops.tuner_ops.set_params &&
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fe->ops.tuner_ops.get_if_frequency) {
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ret = fe->ops.tuner_ops.set_params(fe);
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if (ret)
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goto err;
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ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_frequency);
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if (ret)
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goto err;
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} else {
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ret = -EINVAL;
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goto err;
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}
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dev_dbg(&pdev->dev, "if_frequency=%u\n", if_frequency);
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if (if_frequency != 36150000) {
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ret = -EINVAL;
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goto err;
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}
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switch (c->bandwidth_hz) {
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case 6000000:
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r6a50_val = 0x78;
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break;
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case 7000000:
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r6a50_val = 0x68;
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break;
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case 8000000:
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r6a50_val = 0x58;
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break;
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default:
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ret = -EINVAL;
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goto err;
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}
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ret = zd1301_demod_wreg(dev, 0x6a60, 0x11);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a47, 0x46);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a48, 0x46);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a4a, 0x15);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a4b, 0x63);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a5b, 0x99);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a3b, 0x10);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6806, 0x01);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a41, 0x08);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a42, 0x46);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a44, 0x14);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a45, 0x67);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a38, 0x00);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a4c, 0x52);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a49, 0x2a);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6840, 0x2e);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a50, r6a50_val);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a38, 0x07);
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if (ret)
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goto err;
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return 0;
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err:
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dev_dbg(&pdev->dev, "failed=%d\n", ret);
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return ret;
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}
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static int zd1301_demod_sleep(struct dvb_frontend *fe)
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{
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struct zd1301_demod_dev *dev = fe->demodulator_priv;
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struct platform_device *pdev = dev->pdev;
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int ret;
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dev_dbg(&pdev->dev, "\n");
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ret = zd1301_demod_wreg(dev, 0x6a43, 0x70);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x684e, 0x00);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6849, 0x00);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x68e2, 0xd7);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x68e0, 0x39);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6840, 0x21);
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if (ret)
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goto err;
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return 0;
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err:
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dev_dbg(&pdev->dev, "failed=%d\n", ret);
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return ret;
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}
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static int zd1301_demod_init(struct dvb_frontend *fe)
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{
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struct zd1301_demod_dev *dev = fe->demodulator_priv;
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struct platform_device *pdev = dev->pdev;
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int ret;
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dev_dbg(&pdev->dev, "\n");
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ret = zd1301_demod_wreg(dev, 0x6840, 0x26);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x68e0, 0xff);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x68e2, 0xd8);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6849, 0x4e);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x684e, 0x01);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6a43, zd1301_demod_gain);
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if (ret)
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goto err;
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return 0;
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err:
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dev_dbg(&pdev->dev, "failed=%d\n", ret);
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return ret;
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}
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static int zd1301_demod_get_tune_settings(struct dvb_frontend *fe,
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struct dvb_frontend_tune_settings *settings)
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{
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struct zd1301_demod_dev *dev = fe->demodulator_priv;
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struct platform_device *pdev = dev->pdev;
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dev_dbg(&pdev->dev, "\n");
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/* ~180ms seems to be enough */
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settings->min_delay_ms = 400;
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return 0;
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}
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static int zd1301_demod_read_status(struct dvb_frontend *fe,
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enum fe_status *status)
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{
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struct zd1301_demod_dev *dev = fe->demodulator_priv;
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struct platform_device *pdev = dev->pdev;
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int ret;
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u8 u8tmp;
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ret = zd1301_demod_rreg(dev, 0x6a24, &u8tmp);
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if (ret)
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goto err;
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if (u8tmp > 0x00 && u8tmp < 0x20)
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*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
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FE_HAS_SYNC | FE_HAS_LOCK;
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else
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*status = 0;
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dev_dbg(&pdev->dev, "lock byte=%02x\n", u8tmp);
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/*
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* Interesting registers here are:
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* 0x6a05: get some gain value
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* 0x6a06: get about same gain value than set to 0x6a43
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* 0x6a07: get some gain value
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* 0x6a43: set gain value by driver
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* 0x6a24: get demod lock bits (FSM stage?)
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*
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* Driver should implement some kind of algorithm to calculate suitable
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* value for register 0x6a43, based likely values from register 0x6a05
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* and 0x6a07. Looks like gain register 0x6a43 value could be from
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* range 0x00 - 0x70.
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*/
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if (dev->gain != zd1301_demod_gain) {
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dev->gain = zd1301_demod_gain;
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ret = zd1301_demod_wreg(dev, 0x6a43, dev->gain);
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if (ret)
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goto err;
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}
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return 0;
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err:
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dev_dbg(&pdev->dev, "failed=%d\n", ret);
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return ret;
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}
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static const struct dvb_frontend_ops zd1301_demod_ops = {
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.delsys = {SYS_DVBT},
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.info = {
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.name = "ZyDAS ZD1301",
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.caps = FE_CAN_FEC_1_2 |
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FE_CAN_FEC_2_3 |
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FE_CAN_FEC_3_4 |
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FE_CAN_FEC_5_6 |
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FE_CAN_FEC_7_8 |
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FE_CAN_FEC_AUTO |
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FE_CAN_QPSK |
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FE_CAN_QAM_16 |
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FE_CAN_QAM_64 |
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FE_CAN_QAM_AUTO |
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FE_CAN_TRANSMISSION_MODE_AUTO |
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FE_CAN_GUARD_INTERVAL_AUTO |
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FE_CAN_HIERARCHY_AUTO |
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FE_CAN_MUTE_TS
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},
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.sleep = zd1301_demod_sleep,
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.init = zd1301_demod_init,
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.set_frontend = zd1301_demod_set_frontend,
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.get_tune_settings = zd1301_demod_get_tune_settings,
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.read_status = zd1301_demod_read_status,
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};
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struct dvb_frontend *zd1301_demod_get_dvb_frontend(struct platform_device *pdev)
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{
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struct zd1301_demod_dev *dev = platform_get_drvdata(pdev);
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dev_dbg(&pdev->dev, "\n");
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return &dev->frontend;
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}
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EXPORT_SYMBOL(zd1301_demod_get_dvb_frontend);
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static int zd1301_demod_i2c_master_xfer(struct i2c_adapter *adapter,
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struct i2c_msg msg[], int num)
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{
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struct zd1301_demod_dev *dev = i2c_get_adapdata(adapter);
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struct platform_device *pdev = dev->pdev;
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int ret, i;
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unsigned long timeout;
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u8 u8tmp;
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#define I2C_XFER_TIMEOUT 5
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#define ZD1301_IS_I2C_XFER_WRITE_READ(_msg, _num) \
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(_num == 2 && !(_msg[0].flags & I2C_M_RD) && (_msg[1].flags & I2C_M_RD))
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#define ZD1301_IS_I2C_XFER_WRITE(_msg, _num) \
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(_num == 1 && !(_msg[0].flags & I2C_M_RD))
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#define ZD1301_IS_I2C_XFER_READ(_msg, _num) \
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(_num == 1 && (_msg[0].flags & I2C_M_RD))
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if (ZD1301_IS_I2C_XFER_WRITE_READ(msg, num)) {
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dev_dbg(&pdev->dev, "write&read msg[0].len=%u msg[1].len=%u\n",
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msg[0].len, msg[1].len);
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if (msg[0].len > 1 || msg[1].len > 8) {
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ret = -EOPNOTSUPP;
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goto err;
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}
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ret = zd1301_demod_wreg(dev, 0x6811, 0x80);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6812, 0x05);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6813, msg[1].addr << 1);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6801, msg[0].buf[0]);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6802, 0x00);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6803, 0x06);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6805, 0x00);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6804, msg[1].len);
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if (ret)
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goto err;
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/* Poll xfer ready */
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timeout = jiffies + msecs_to_jiffies(I2C_XFER_TIMEOUT);
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for (u8tmp = 1; !time_after(jiffies, timeout) && u8tmp;) {
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usleep_range(500, 800);
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ret = zd1301_demod_rreg(dev, 0x6804, &u8tmp);
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if (ret)
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goto err;
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}
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for (i = 0; i < msg[1].len; i++) {
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ret = zd1301_demod_rreg(dev, 0x0600 + i, &msg[1].buf[i]);
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if (ret)
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goto err;
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}
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} else if (ZD1301_IS_I2C_XFER_WRITE(msg, num)) {
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dev_dbg(&pdev->dev, "write msg[0].len=%u\n", msg[0].len);
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if (msg[0].len > 1 + 8) {
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ret = -EOPNOTSUPP;
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goto err;
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}
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ret = zd1301_demod_wreg(dev, 0x6811, 0x80);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6812, 0x01);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6813, msg[0].addr << 1);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6800, msg[0].buf[0]);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6802, 0x00);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6803, 0x06);
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if (ret)
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goto err;
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for (i = 0; i < msg[0].len - 1; i++) {
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ret = zd1301_demod_wreg(dev, 0x0600 + i, msg[0].buf[1 + i]);
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if (ret)
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goto err;
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}
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ret = zd1301_demod_wreg(dev, 0x6805, 0x80);
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if (ret)
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goto err;
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ret = zd1301_demod_wreg(dev, 0x6804, msg[0].len - 1);
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if (ret)
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goto err;
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/* Poll xfer ready */
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timeout = jiffies + msecs_to_jiffies(I2C_XFER_TIMEOUT);
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for (u8tmp = 1; !time_after(jiffies, timeout) && u8tmp;) {
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usleep_range(500, 800);
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ret = zd1301_demod_rreg(dev, 0x6804, &u8tmp);
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if (ret)
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goto err;
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}
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} else {
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dev_dbg(&pdev->dev, "unknown msg[0].len=%u\n", msg[0].len);
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ret = -EOPNOTSUPP;
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if (ret)
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goto err;
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}
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return num;
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err:
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dev_dbg(&pdev->dev, "failed=%d\n", ret);
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return ret;
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}
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static u32 zd1301_demod_i2c_functionality(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_I2C;
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}
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static struct i2c_algorithm zd1301_demod_i2c_algorithm = {
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.master_xfer = zd1301_demod_i2c_master_xfer,
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.functionality = zd1301_demod_i2c_functionality,
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};
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struct i2c_adapter *zd1301_demod_get_i2c_adapter(struct platform_device *pdev)
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{
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struct zd1301_demod_dev *dev = platform_get_drvdata(pdev);
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dev_dbg(&pdev->dev, "\n");
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return &dev->adapter;
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}
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EXPORT_SYMBOL(zd1301_demod_get_i2c_adapter);
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/* Platform driver interface */
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static int zd1301_demod_probe(struct platform_device *pdev)
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{
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struct zd1301_demod_dev *dev;
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struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;
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int ret;
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dev_dbg(&pdev->dev, "\n");
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if (!pdata) {
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ret = -EINVAL;
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dev_err(&pdev->dev, "cannot proceed without platform data\n");
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goto err;
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}
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if (!pdev->dev.parent->driver) {
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ret = -EINVAL;
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dev_dbg(&pdev->dev, "no parent device\n");
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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");
|