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 <cr...@iki.fi>
---
drivers/media/dvb-frontends/Kconfig | 7 +
drivers/media/dvb-frontends/Makefile | 1 +
drivers/media/dvb-frontends/zd1301_demod.c | 535 +++++++++++++++++++++++++++++
drivers/media/dvb-frontends/zd1301_demod.h | 55 +++
4 files changed, 598 insertions(+)
create mode 100644 drivers/media/dvb-frontends/zd1301_demod.c
create mode 100644 drivers/media/dvb-frontends/zd1301_demod.h
diff --git a/drivers/media/dvb-frontends/Kconfig
b/drivers/media/dvb-frontends/Kconfig
index 5ab90f3..7f5b606 100644
--- a/drivers/media/dvb-frontends/Kconfig
+++ b/drivers/media/dvb-frontends/Kconfig
@@ -487,6 +487,13 @@ config DVB_AS102_FE
depends on DVB_CORE
default DVB_AS102
+config DVB_ZD1301_DEMOD
+ tristate "ZyDAS ZD1301"
+ depends on DVB_CORE && I2C
+ default m if !MEDIA_SUBDRV_AUTOSELECT
+ help
+ Say Y when you want to support this frontend.
+
comment "DVB-C (cable) frontends"
depends on DVB_CORE
diff --git a/drivers/media/dvb-frontends/Makefile
b/drivers/media/dvb-frontends/Makefile
index ebab1b8..94e556d 100644
--- a/drivers/media/dvb-frontends/Makefile
+++ b/drivers/media/dvb-frontends/Makefile
@@ -118,3 +118,4 @@ obj-$(CONFIG_DVB_M88RS2000) += m88rs2000.o
obj-$(CONFIG_DVB_AF9033) += af9033.o
obj-$(CONFIG_DVB_AS102_FE) += as102_fe.o
obj-$(CONFIG_DVB_TC90522) += tc90522.o
+obj-$(CONFIG_DVB_ZD1301_DEMOD) += zd1301_demod.o
diff --git a/drivers/media/dvb-frontends/zd1301_demod.c
b/drivers/media/dvb-frontends/zd1301_demod.c
new file mode 100644
index 0000000..8cd8999
--- /dev/null
+++ b/drivers/media/dvb-frontends/zd1301_demod.c
@@ -0,0 +1,535 @@
+/*
+ * ZyDAS ZD1301 driver (demodulator)
+ *
+ * Copyright (C) 2015 Antti Palosaari <cr...@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;
+ u8 r6a50_val;
+
+ dev_dbg(&pdev->dev, "frequency=%u bandwidth_hz=%u inversion=%u\n",
+ c->frequency, c->bandwidth_hz, c->inversion);
+
+ /* Program tuner */
+ if (fe->ops.tuner_ops.set_params) {
+ ret = fe->ops.tuner_ops.set_params(fe);
+ if (ret)
+ 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;
+ }
+
+err:
+ return ret ? ret : num;
+}
+
+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) {
+ dev_err(&pdev->dev, "Cannot proceed without platform data\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ if (!pdev->dev.parent->driver) {
+ dev_dbg(&pdev->dev, "No parent device\n");
+ ret = -EINVAL;
+ 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_info(&pdev->dev, "I2C adapter failed\n");
+ 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 <cr...@iki.fi>");
+MODULE_DESCRIPTION("ZyDAS ZD1301 demodulator driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/dvb-frontends/zd1301_demod.h
b/drivers/media/dvb-frontends/zd1301_demod.h
new file mode 100644
index 0000000..78a3122
--- /dev/null
+++ b/drivers/media/dvb-frontends/zd1301_demod.h
@@ -0,0 +1,55 @@
+/*
+ * ZyDAS ZD1301 driver (demodulator)
+ *
+ * Copyright (C) 2015 Antti Palosaari <cr...@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 */
--
http://palosaari.fi/
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