drivers/media/tuners/si2157.c - vendor/opensource/backports - Git at Google

 /*
  * Silicon Labs Si2146/2147/2148/2157/2158 silicon tuner driver
  *
  * Copyright (C) 2014 Antti Palosaari <crope@iki.fi>
  *
  *    This program is free software; you can redistribute it and/or modify
  *    it under the terms of the GNU General Public License as published by
  *    the Free Software Foundation; either version 2 of the License, or
  *    (at your option) any later version.
  *
  *    This program is distributed in the hope that it will be useful,
  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  */

 #include "si2157_priv.h"

 static const struct dvb_tuner_ops si2157_ops;

 /* execute firmware command */
 static int si2157_cmd_execute(struct i2c_client *client, struct si2157_cmd *cmd)
 {
 	struct si2157_dev *dev = i2c_get_clientdata(client);
 	int ret;
 	unsigned long timeout;

 	mutex_lock(&dev->i2c_mutex);

 	if (cmd->wlen) {
 		/* write cmd and args for firmware */
 		ret = i2c_master_send(client, cmd->args, cmd->wlen);
 		if (ret < 0) {
 			goto err_mutex_unlock;
 		} else if (ret != cmd->wlen) {
 			ret = -EREMOTEIO;
 			goto err_mutex_unlock;
 		}
 	}

 	if (cmd->rlen) {
 		/* wait cmd execution terminate */
 		#define TIMEOUT 80
 		timeout = jiffies + msecs_to_jiffies(TIMEOUT);
 		while (!time_after(jiffies, timeout)) {
 			ret = i2c_master_recv(client, cmd->args, cmd->rlen);
 			if (ret < 0) {
 				goto err_mutex_unlock;
 			} else if (ret != cmd->rlen) {
 				ret = -EREMOTEIO;
 				goto err_mutex_unlock;
 			}

 			/* firmware ready? */
 			if ((cmd->args[0] >> 7) & 0x01)
 				break;
 		}

 		dev_dbg(&client->dev, "cmd execution took %d ms\n",
 				jiffies_to_msecs(jiffies) -
 				(jiffies_to_msecs(timeout) - TIMEOUT));

 		if (!((cmd->args[0] >> 7) & 0x01)) {
 			ret = -ETIMEDOUT;
 			goto err_mutex_unlock;
 		}
 	}

 	mutex_unlock(&dev->i2c_mutex);
 	return 0;

 err_mutex_unlock:
 	mutex_unlock(&dev->i2c_mutex);
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;
 }

 static int si2157_init(struct dvb_frontend *fe)
 {
 	struct i2c_client *client = fe->tuner_priv;
 	struct si2157_dev *dev = i2c_get_clientdata(client);
 	int ret, len, remaining;
 	struct si2157_cmd cmd;
 	const struct firmware *fw;
 	const char *fw_name;
 	unsigned int chip_id;

 	dev_dbg(&client->dev, "\n");

 	if (dev->fw_loaded)
 		goto warm;

 	/* power up */
 	if (dev->chiptype == SI2157_CHIPTYPE_SI2146) {
 		memcpy(cmd.args, "\xc0\x05\x01\x00\x00\x0b\x00\x00\x01", 9);
 		cmd.wlen = 9;
 	} else {
 		memcpy(cmd.args, "\xc0\x00\x0c\x00\x00\x01\x01\x01\x01\x01\x01\x02\x00\x00\x01", 15);
 		cmd.wlen = 15;
 	}
 	cmd.rlen = 1;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	/* query chip revision */
 	memcpy(cmd.args, "\x02", 1);
 	cmd.wlen = 1;
 	cmd.rlen = 13;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	chip_id = cmd.args[1] << 24 | cmd.args[2] << 16 | cmd.args[3] << 8 |
 			cmd.args[4] << 0;

 	#define SI2158_A20 ('A' << 24 | 58 << 16 | '2' << 8 | '0' << 0)
 	#define SI2148_A20 ('A' << 24 | 48 << 16 | '2' << 8 | '0' << 0)
 	#define SI2157_A30 ('A' << 24 | 57 << 16 | '3' << 8 | '0' << 0)
 	#define SI2147_A30 ('A' << 24 | 47 << 16 | '3' << 8 | '0' << 0)
 	#define SI2146_A10 ('A' << 24 | 46 << 16 | '1' << 8 | '0' << 0)

 	switch (chip_id) {
 	case SI2158_A20:
 	case SI2148_A20:
 		fw_name = SI2158_A20_FIRMWARE;
 		break;
 	case SI2157_A30:
 	case SI2147_A30:
 	case SI2146_A10:
 		fw_name = NULL;
 		break;
 	default:
 		dev_err(&client->dev, "unknown chip version Si21%d-%c%c%c\n",
 				cmd.args[2], cmd.args[1],
 				cmd.args[3], cmd.args[4]);
 		ret = -EINVAL;
 		goto err;
 	}

 	dev_info(&client->dev, "found a 'Silicon Labs Si21%d-%c%c%c'\n",
 			cmd.args[2], cmd.args[1], cmd.args[3], cmd.args[4]);

 	if (fw_name == NULL)
 		goto skip_fw_download;

 	/* request the firmware, this will block and timeout */
 	ret = request_firmware(&fw, fw_name, &client->dev);
 	if (ret) {
 		dev_err(&client->dev, "firmware file '%s' not found\n",
 				fw_name);
 		goto err;
 	}

 	/* firmware should be n chunks of 17 bytes */
 	if (fw->size % 17 != 0) {
 		dev_err(&client->dev, "firmware file '%s' is invalid\n",
 				fw_name);
 		ret = -EINVAL;
 		goto err_release_firmware;
 	}

 	dev_info(&client->dev, "downloading firmware from file '%s'\n",
 			fw_name);

 	for (remaining = fw->size; remaining > 0; remaining -= 17) {
 		len = fw->data[fw->size - remaining];
 		memcpy(cmd.args, &fw->data[(fw->size - remaining) + 1], len);
 		cmd.wlen = len;
 		cmd.rlen = 1;
 		ret = si2157_cmd_execute(client, &cmd);
 		if (ret) {
 			dev_err(&client->dev, "firmware download failed %d\n",
 					ret);
 			goto err_release_firmware;
 		}
 	}

 	release_firmware(fw);

 skip_fw_download:
 	/* reboot the tuner with new firmware? */
 	memcpy(cmd.args, "\x01\x01", 2);
 	cmd.wlen = 2;
 	cmd.rlen = 1;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	/* query firmware version */
 	memcpy(cmd.args, "\x11", 1);
 	cmd.wlen = 1;
 	cmd.rlen = 10;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	dev_info(&client->dev, "firmware version: %c.%c.%d\n",
 			cmd.args[6], cmd.args[7], cmd.args[8]);

 	dev->fw_loaded = true;

 warm:
 	dev->active = true;
 	return 0;

 err_release_firmware:
 	release_firmware(fw);
 err:
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;
 }

 static int si2157_sleep(struct dvb_frontend *fe)
 {
 	struct i2c_client *client = fe->tuner_priv;
 	struct si2157_dev *dev = i2c_get_clientdata(client);
 	int ret;
 	struct si2157_cmd cmd;

 	dev_dbg(&client->dev, "\n");

 	dev->active = false;

 	/* standby */
 	memcpy(cmd.args, "\x16\x00", 2);
 	cmd.wlen = 2;
 	cmd.rlen = 1;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	return 0;
 err:
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;
 }

 static int si2157_set_params(struct dvb_frontend *fe)
 {
 	struct i2c_client *client = fe->tuner_priv;
 	struct si2157_dev *dev = i2c_get_clientdata(client);
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	int ret;
 	struct si2157_cmd cmd;
 	u8 bandwidth, delivery_system;
 	u32 if_frequency = 5000000;

 	dev_dbg(&client->dev,
 			"delivery_system=%d frequency=%u bandwidth_hz=%u\n",
 			c->delivery_system, c->frequency, c->bandwidth_hz);

 	if (!dev->active) {
 		ret = -EAGAIN;
 		goto err;
 	}

 	if (c->bandwidth_hz <= 6000000)
 		bandwidth = 0x06;
 	else if (c->bandwidth_hz <= 7000000)
 		bandwidth = 0x07;
 	else if (c->bandwidth_hz <= 8000000)
 		bandwidth = 0x08;
 	else
 		bandwidth = 0x0f;

 	switch (c->delivery_system) {
 	case SYS_ATSC:
 			delivery_system = 0x00;
 			if_frequency = 3250000;
 			break;
 	case SYS_DVBC_ANNEX_B:
 			delivery_system = 0x10;
 			if_frequency = 4000000;
 			break;
 	case SYS_DVBT:
 	case SYS_DVBT2: /* it seems DVB-T and DVB-T2 both are 0x20 here */
 			delivery_system = 0x20;
 			break;
 	case SYS_DVBC_ANNEX_A:
 			delivery_system = 0x30;
 			break;
 	default:
 			ret = -EINVAL;
 			goto err;
 	}

 	memcpy(cmd.args, "\x14\x00\x03\x07\x00\x00", 6);
 	cmd.args[4] = delivery_system | bandwidth;
 	if (dev->inversion)
 		cmd.args[5] = 0x01;
 	cmd.wlen = 6;
 	cmd.rlen = 4;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	if (dev->chiptype == SI2157_CHIPTYPE_SI2146)
 		memcpy(cmd.args, "\x14\x00\x02\x07\x00\x01", 6);
 	else
 		memcpy(cmd.args, "\x14\x00\x02\x07\x01\x00", 6);
 	cmd.wlen = 6;
 	cmd.rlen = 4;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	/* set if frequency if needed */
 	if (if_frequency != dev->if_frequency) {
 		memcpy(cmd.args, "\x14\x00\x06\x07", 4);
 		cmd.args[4] = (if_frequency / 1000) & 0xff;
 		cmd.args[5] = ((if_frequency / 1000) >> 8) & 0xff;
 		cmd.wlen = 6;
 		cmd.rlen = 4;
 		ret = si2157_cmd_execute(client, &cmd);
 		if (ret)
 			goto err;

 		dev->if_frequency = if_frequency;
 	}

 	/* set frequency */
 	memcpy(cmd.args, "\x41\x00\x00\x00\x00\x00\x00\x00", 8);
 	cmd.args[4] = (c->frequency >>  0) & 0xff;
 	cmd.args[5] = (c->frequency >>  8) & 0xff;
 	cmd.args[6] = (c->frequency >> 16) & 0xff;
 	cmd.args[7] = (c->frequency >> 24) & 0xff;
 	cmd.wlen = 8;
 	cmd.rlen = 1;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err;

 	return 0;
 err:
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;
 }

 static int si2157_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct i2c_client *client = fe->tuner_priv;
 	struct si2157_dev *dev = i2c_get_clientdata(client);

 	*frequency = dev->if_frequency;
 	return 0;
 }

 static const struct dvb_tuner_ops si2157_ops = {
 	.info = {
 		.name           = "Silicon Labs Si2146/2147/2148/2157/2158",
 		.frequency_min  = 55000000,
 		.frequency_max  = 862000000,
 	},

 	.init = si2157_init,
 	.sleep = si2157_sleep,
 	.set_params = si2157_set_params,
 	.get_if_frequency = si2157_get_if_frequency,
 };

 static int si2157_probe(struct i2c_client *client,
 		const struct i2c_device_id *id)
 {
 	struct si2157_config *cfg = client->dev.platform_data;
 	struct dvb_frontend *fe = cfg->fe;
 	struct si2157_dev *dev;
 	struct si2157_cmd cmd;
 	int ret;

 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev) {
 		ret = -ENOMEM;
 		dev_err(&client->dev, "kzalloc() failed\n");
 		goto err;
 	}

 	i2c_set_clientdata(client, dev);
 	dev->fe = cfg->fe;
 	dev->inversion = cfg->inversion;
 	dev->fw_loaded = false;
 	dev->chiptype = (u8)id->driver_data;
 	dev->if_frequency = 5000000; /* default value of property 0x0706 */
 	mutex_init(&dev->i2c_mutex);

 	/* check if the tuner is there */
 	cmd.wlen = 0;
 	cmd.rlen = 1;
 	ret = si2157_cmd_execute(client, &cmd);
 	if (ret)
 		goto err_kfree;

 	memcpy(&fe->ops.tuner_ops, &si2157_ops, sizeof(struct dvb_tuner_ops));
 	fe->tuner_priv = client;

 	dev_info(&client->dev, "Silicon Labs %s successfully attached\n",
 			dev->chiptype == SI2157_CHIPTYPE_SI2146 ?
 			"Si2146" : "Si2147/2148/2157/2158");

 	return 0;

 err_kfree:
 	kfree(dev);
 err:
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;
 }

 static int si2157_remove(struct i2c_client *client)
 {
 	struct si2157_dev *dev = i2c_get_clientdata(client);
 	struct dvb_frontend *fe = dev->fe;

 	dev_dbg(&client->dev, "\n");

 	memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
 	fe->tuner_priv = NULL;
 	kfree(dev);

 	return 0;
 }

 static const struct i2c_device_id si2157_id_table[] = {
 	{"si2157", SI2157_CHIPTYPE_SI2157},
 	{"si2146", SI2157_CHIPTYPE_SI2146},
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, si2157_id_table);

 static struct i2c_driver si2157_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= "si2157",
 	},
 	.probe		= si2157_probe,
 	.remove		= si2157_remove,
 	.id_table	= si2157_id_table,
 };

 module_i2c_driver(si2157_driver);

 MODULE_DESCRIPTION("Silicon Labs Si2146/2147/2148/2157/2158 silicon tuner driver");
 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 MODULE_LICENSE("GPL");
 MODULE_FIRMWARE(SI2158_A20_FIRMWARE);
	/*
	* Silicon Labs Si2146/2147/2148/2157/2158 silicon tuner driver
	*
	* Copyright (C) 2014 Antti Palosaari <crope@iki.fi>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include "si2157_priv.h"

	static const struct dvb_tuner_ops si2157_ops;

	/* execute firmware command */
	static int si2157_cmd_execute(struct i2c_client client, struct si2157_cmd cmd)
	{
	struct si2157_dev *dev = i2c_get_clientdata(client);
	int ret;
	unsigned long timeout;

	mutex_lock(&dev->i2c_mutex);

	if (cmd->wlen) {
	/* write cmd and args for firmware */
	ret = i2c_master_send(client, cmd->args, cmd->wlen);
	if (ret < 0) {
	goto err_mutex_unlock;
	} else if (ret != cmd->wlen) {
	ret = -EREMOTEIO;
	goto err_mutex_unlock;
	}
	}

	if (cmd->rlen) {
	/* wait cmd execution terminate */
	#define TIMEOUT 80
	timeout = jiffies + msecs_to_jiffies(TIMEOUT);
	while (!time_after(jiffies, timeout)) {
	ret = i2c_master_recv(client, cmd->args, cmd->rlen);
	if (ret < 0) {
	goto err_mutex_unlock;
	} else if (ret != cmd->rlen) {
	ret = -EREMOTEIO;
	goto err_mutex_unlock;
	}

	/* firmware ready? */
	if ((cmd->args[0] >> 7) & 0x01)
	break;
	}

	dev_dbg(&client->dev, "cmd execution took %d ms\n",
	jiffies_to_msecs(jiffies) -
	(jiffies_to_msecs(timeout) - TIMEOUT));

	if (!((cmd->args[0] >> 7) & 0x01)) {
	ret = -ETIMEDOUT;
	goto err_mutex_unlock;
	}
	}

	mutex_unlock(&dev->i2c_mutex);
	return 0;

	err_mutex_unlock:
	mutex_unlock(&dev->i2c_mutex);
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
	}

	static int si2157_init(struct dvb_frontend *fe)
	{
	struct i2c_client *client = fe->tuner_priv;
	struct si2157_dev *dev = i2c_get_clientdata(client);
	int ret, len, remaining;
	struct si2157_cmd cmd;
	const struct firmware *fw;
	const char *fw_name;
	unsigned int chip_id;

	dev_dbg(&client->dev, "\n");

	if (dev->fw_loaded)
	goto warm;

	/* power up */
	if (dev->chiptype == SI2157_CHIPTYPE_SI2146) {
	memcpy(cmd.args, "\xc0\x05\x01\x00\x00\x0b\x00\x00\x01", 9);
	cmd.wlen = 9;
	} else {
	memcpy(cmd.args, "\xc0\x00\x0c\x00\x00\x01\x01\x01\x01\x01\x01\x02\x00\x00\x01", 15);
	cmd.wlen = 15;
	}
	cmd.rlen = 1;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	/* query chip revision */
	memcpy(cmd.args, "\x02", 1);
	cmd.wlen = 1;
	cmd.rlen = 13;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	chip_id = cmd.args[1] << 24 \| cmd.args[2] << 16 \| cmd.args[3] << 8 \|
	cmd.args[4] << 0;

	#define SI2158_A20 ('A' << 24 \| 58 << 16 \| '2' << 8 \| '0' << 0)
	#define SI2148_A20 ('A' << 24 \| 48 << 16 \| '2' << 8 \| '0' << 0)
	#define SI2157_A30 ('A' << 24 \| 57 << 16 \| '3' << 8 \| '0' << 0)
	#define SI2147_A30 ('A' << 24 \| 47 << 16 \| '3' << 8 \| '0' << 0)
	#define SI2146_A10 ('A' << 24 \| 46 << 16 \| '1' << 8 \| '0' << 0)

	switch (chip_id) {
	case SI2158_A20:
	case SI2148_A20:
	fw_name = SI2158_A20_FIRMWARE;
	break;
	case SI2157_A30:
	case SI2147_A30:
	case SI2146_A10:
	fw_name = NULL;
	break;
	default:
	dev_err(&client->dev, "unknown chip version Si21%d-%c%c%c\n",
	cmd.args[2], cmd.args[1],
	cmd.args[3], cmd.args[4]);
	ret = -EINVAL;
	goto err;
	}

	dev_info(&client->dev, "found a 'Silicon Labs Si21%d-%c%c%c'\n",
	cmd.args[2], cmd.args[1], cmd.args[3], cmd.args[4]);

	if (fw_name == NULL)
	goto skip_fw_download;

	/* request the firmware, this will block and timeout */
	ret = request_firmware(&fw, fw_name, &client->dev);
	if (ret) {
	dev_err(&client->dev, "firmware file '%s' not found\n",
	fw_name);
	goto err;
	}

	/* firmware should be n chunks of 17 bytes */
	if (fw->size % 17 != 0) {
	dev_err(&client->dev, "firmware file '%s' is invalid\n",
	fw_name);
	ret = -EINVAL;
	goto err_release_firmware;
	}

	dev_info(&client->dev, "downloading firmware from file '%s'\n",
	fw_name);

	for (remaining = fw->size; remaining > 0; remaining -= 17) {
	len = fw->data[fw->size - remaining];
	memcpy(cmd.args, &fw->data[(fw->size - remaining) + 1], len);
	cmd.wlen = len;
	cmd.rlen = 1;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret) {
	dev_err(&client->dev, "firmware download failed %d\n",
	ret);
	goto err_release_firmware;
	}
	}

	release_firmware(fw);

	skip_fw_download:
	/* reboot the tuner with new firmware? */
	memcpy(cmd.args, "\x01\x01", 2);
	cmd.wlen = 2;
	cmd.rlen = 1;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	/* query firmware version */
	memcpy(cmd.args, "\x11", 1);
	cmd.wlen = 1;
	cmd.rlen = 10;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	dev_info(&client->dev, "firmware version: %c.%c.%d\n",
	cmd.args[6], cmd.args[7], cmd.args[8]);

	dev->fw_loaded = true;

	warm:
	dev->active = true;
	return 0;

	err_release_firmware:
	release_firmware(fw);
	err:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
	}

	static int si2157_sleep(struct dvb_frontend *fe)
	{
	struct i2c_client *client = fe->tuner_priv;
	struct si2157_dev *dev = i2c_get_clientdata(client);
	int ret;
	struct si2157_cmd cmd;

	dev_dbg(&client->dev, "\n");

	dev->active = false;

	/* standby */
	memcpy(cmd.args, "\x16\x00", 2);
	cmd.wlen = 2;
	cmd.rlen = 1;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	return 0;
	err:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
	}

	static int si2157_set_params(struct dvb_frontend *fe)
	{
	struct i2c_client *client = fe->tuner_priv;
	struct si2157_dev *dev = i2c_get_clientdata(client);
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	int ret;
	struct si2157_cmd cmd;
	u8 bandwidth, delivery_system;
	u32 if_frequency = 5000000;

	dev_dbg(&client->dev,
	"delivery_system=%d frequency=%u bandwidth_hz=%u\n",
	c->delivery_system, c->frequency, c->bandwidth_hz);

	if (!dev->active) {
	ret = -EAGAIN;
	goto err;
	}

	if (c->bandwidth_hz <= 6000000)
	bandwidth = 0x06;
	else if (c->bandwidth_hz <= 7000000)
	bandwidth = 0x07;
	else if (c->bandwidth_hz <= 8000000)
	bandwidth = 0x08;
	else
	bandwidth = 0x0f;

	switch (c->delivery_system) {
	case SYS_ATSC:
	delivery_system = 0x00;
	if_frequency = 3250000;
	break;
	case SYS_DVBC_ANNEX_B:
	delivery_system = 0x10;
	if_frequency = 4000000;
	break;
	case SYS_DVBT:
	case SYS_DVBT2: /* it seems DVB-T and DVB-T2 both are 0x20 here */
	delivery_system = 0x20;
	break;
	case SYS_DVBC_ANNEX_A:
	delivery_system = 0x30;
	break;
	default:
	ret = -EINVAL;
	goto err;
	}

	memcpy(cmd.args, "\x14\x00\x03\x07\x00\x00", 6);
	cmd.args[4] = delivery_system \| bandwidth;
	if (dev->inversion)
	cmd.args[5] = 0x01;
	cmd.wlen = 6;
	cmd.rlen = 4;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	if (dev->chiptype == SI2157_CHIPTYPE_SI2146)
	memcpy(cmd.args, "\x14\x00\x02\x07\x00\x01", 6);
	else
	memcpy(cmd.args, "\x14\x00\x02\x07\x01\x00", 6);
	cmd.wlen = 6;
	cmd.rlen = 4;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	/* set if frequency if needed */
	if (if_frequency != dev->if_frequency) {
	memcpy(cmd.args, "\x14\x00\x06\x07", 4);
	cmd.args[4] = (if_frequency / 1000) & 0xff;
	cmd.args[5] = ((if_frequency / 1000) >> 8) & 0xff;
	cmd.wlen = 6;
	cmd.rlen = 4;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	dev->if_frequency = if_frequency;
	}

	/* set frequency */
	memcpy(cmd.args, "\x41\x00\x00\x00\x00\x00\x00\x00", 8);
	cmd.args[4] = (c->frequency >> 0) & 0xff;
	cmd.args[5] = (c->frequency >> 8) & 0xff;
	cmd.args[6] = (c->frequency >> 16) & 0xff;
	cmd.args[7] = (c->frequency >> 24) & 0xff;
	cmd.wlen = 8;
	cmd.rlen = 1;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err;

	return 0;
	err:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
	}

	static int si2157_get_if_frequency(struct dvb_frontend fe, u32 frequency)
	{
	struct i2c_client *client = fe->tuner_priv;
	struct si2157_dev *dev = i2c_get_clientdata(client);

	*frequency = dev->if_frequency;
	return 0;
	}

	static const struct dvb_tuner_ops si2157_ops = {
	.info = {
	.name = "Silicon Labs Si2146/2147/2148/2157/2158",
	.frequency_min = 55000000,
	.frequency_max = 862000000,
	},

	.init = si2157_init,
	.sleep = si2157_sleep,
	.set_params = si2157_set_params,
	.get_if_frequency = si2157_get_if_frequency,
	};

	static int si2157_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct si2157_config *cfg = client->dev.platform_data;
	struct dvb_frontend *fe = cfg->fe;
	struct si2157_dev *dev;
	struct si2157_cmd cmd;
	int ret;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev) {
	ret = -ENOMEM;
	dev_err(&client->dev, "kzalloc() failed\n");
	goto err;
	}

	i2c_set_clientdata(client, dev);
	dev->fe = cfg->fe;
	dev->inversion = cfg->inversion;
	dev->fw_loaded = false;
	dev->chiptype = (u8)id->driver_data;
	dev->if_frequency = 5000000; /* default value of property 0x0706 */
	mutex_init(&dev->i2c_mutex);

	/* check if the tuner is there */
	cmd.wlen = 0;
	cmd.rlen = 1;
	ret = si2157_cmd_execute(client, &cmd);
	if (ret)
	goto err_kfree;

	memcpy(&fe->ops.tuner_ops, &si2157_ops, sizeof(struct dvb_tuner_ops));
	fe->tuner_priv = client;

	dev_info(&client->dev, "Silicon Labs %s successfully attached\n",
	dev->chiptype == SI2157_CHIPTYPE_SI2146 ?
	"Si2146" : "Si2147/2148/2157/2158");

	return 0;

	err_kfree:
	kfree(dev);
	err:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
	}

	static int si2157_remove(struct i2c_client *client)
	{
	struct si2157_dev *dev = i2c_get_clientdata(client);
	struct dvb_frontend *fe = dev->fe;

	dev_dbg(&client->dev, "\n");

	memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
	fe->tuner_priv = NULL;
	kfree(dev);

	return 0;
	}

	static const struct i2c_device_id si2157_id_table[] = {
	{"si2157", SI2157_CHIPTYPE_SI2157},
	{"si2146", SI2157_CHIPTYPE_SI2146},
	{}
	};
	MODULE_DEVICE_TABLE(i2c, si2157_id_table);

	static struct i2c_driver si2157_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = "si2157",
	},
	.probe = si2157_probe,
	.remove = si2157_remove,
	.id_table = si2157_id_table,
	};

	module_i2c_driver(si2157_driver);

	MODULE_DESCRIPTION("Silicon Labs Si2146/2147/2148/2157/2158 silicon tuner driver");
	MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
	MODULE_LICENSE("GPL");
	MODULE_FIRMWARE(SI2158_A20_FIRMWARE);