[media] zd1301_demod: ZyDAS ZD1301 DVB-T demodulator driver
ZyDAS ZD1301 is chip having USB interface and DVB-T demodulator integrated. This driver is for demodulator part. Driver is very reduced, just basic demodulator functionality, no statistics at all. It registers as a platform driver to driver core. Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Palosaari
Mauro Carvalho Chehab
parent
433c486497
commit
47d65372b3
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@ -513,6 +513,13 @@ config DVB_AS102_FE
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depends on DVB_CORE
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default DVB_AS102
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config DVB_ZD1301_DEMOD
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tristate "ZyDAS ZD1301"
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depends on DVB_CORE && I2C
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default m if !MEDIA_SUBDRV_AUTOSELECT
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help
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Say Y when you want to support this frontend.
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config DVB_GP8PSK_FE
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tristate
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depends on DVB_CORE
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@ -126,3 +126,4 @@ obj-$(CONFIG_DVB_TC90522) += tc90522.o
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obj-$(CONFIG_DVB_HORUS3A) += horus3a.o
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obj-$(CONFIG_DVB_ASCOT2E) += ascot2e.o
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obj-$(CONFIG_DVB_HELENE) += helene.o
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obj-$(CONFIG_DVB_ZD1301_DEMOD) += zd1301_demod.o
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@ -0,0 +1,551 @@
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/*
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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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|
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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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|
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ret = zd1301_demod_wreg(dev, 0x6805, 0x80);
|
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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 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");
|
||||
|
|
@ -0,0 +1,55 @@
|
|||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef ZD1301_DEMOD_H
|
||||
#define ZD1301_DEMOD_H
|
||||
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/dvb/frontend.h>
|
||||
#include "dvb_frontend.h"
|
||||
|
||||
/**
|
||||
* struct zd1301_demod_platform_data - Platform data for the zd1301_demod driver
|
||||
* @reg_priv: First argument of reg_read and reg_write callbacks.
|
||||
* @reg_read: Register read callback.
|
||||
* @reg_write: Register write callback.
|
||||
*/
|
||||
|
||||
struct zd1301_demod_platform_data {
|
||||
void *reg_priv;
|
||||
int (*reg_read)(void *, u16, u8 *);
|
||||
int (*reg_write)(void *, u16, u8);
|
||||
};
|
||||
|
||||
/**
|
||||
* zd1301_demod_get_dvb_frontend() - Get pointer to DVB frontend
|
||||
* @pdev: Pointer to platform device
|
||||
*
|
||||
* Return: Pointer to DVB frontend which given platform device owns.
|
||||
*/
|
||||
|
||||
struct dvb_frontend *zd1301_demod_get_dvb_frontend(struct platform_device *);
|
||||
|
||||
/**
|
||||
* zd1301_demod_get_i2c_adapter() - Get pointer to I2C adapter
|
||||
* @pdev: Pointer to platform device
|
||||
*
|
||||
* Return: Pointer to I2C adapter which given platform device owns.
|
||||
*/
|
||||
|
||||
struct i2c_adapter *zd1301_demod_get_i2c_adapter(struct platform_device *);
|
||||
|
||||
#endif /* ZD1301_DEMOD_H */
|
||||
Loading…
Reference in New Issue