Revert "[media] mfd: Add the main bulk of core driver for SI476x code"

This reverts commit b40fe4f67de2c826868f408e03f2ef9fe39d85b9.

Conflicts:
	drivers/mfd/si476x-i2c.c

Requested-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/mfd/si476x-i2c.c

@@ -1,886 +0,0 @@
-/*
- * drivers/mfd/si476x-i2c.c -- Core device driver for si476x MFD
- * device
- *
- * Copyright (C) 2012 Innovative Converged Devices(ICD)
- * Copyright (C) 2013 Andrey Smirnov
- *
- * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
- *
- * 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; version 2 of the License.
- *
- * 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 <linux/module.h>
-
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/gpio.h>
-#include <linux/regulator/consumer.h>
-#include <linux/i2c.h>
-#include <linux/err.h>
-
-#include <linux/mfd/si476x-core.h>
-
-#define SI476X_MAX_IO_ERRORS		10
-#define SI476X_DRIVER_RDS_FIFO_DEPTH	128
-
-/**
- * si476x_core_config_pinmux() - pin function configuration function
- *
- * @core: Core device structure
- *
- * Configure the functions of the pins of the radio chip.
- *
- * The function returns zero in case of succes or negative error code
- * otherwise.
- */
-static int si476x_core_config_pinmux(struct si476x_core *core)
-{
-	int err;
-	dev_dbg(&core->client->dev, "Configuring pinmux\n");
-	err = si476x_core_cmd_dig_audio_pin_cfg(core,
-						core->pinmux.dclk,
-						core->pinmux.dfs,
-						core->pinmux.dout,
-						core->pinmux.xout);
-	if (err < 0) {
-		dev_err(&core->client->dev,
-			"Failed to configure digital audio pins(err = %d)\n",
-			err);
-		return err;
-	}
-
-	err = si476x_core_cmd_zif_pin_cfg(core,
-					  core->pinmux.iqclk,
-					  core->pinmux.iqfs,
-					  core->pinmux.iout,
-					  core->pinmux.qout);
-	if (err < 0) {
-		dev_err(&core->client->dev,
-			"Failed to configure ZIF pins(err = %d)\n",
-			err);
-		return err;
-	}
-
-	err = si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(core,
-						      core->pinmux.icin,
-						      core->pinmux.icip,
-						      core->pinmux.icon,
-						      core->pinmux.icop);
-	if (err < 0) {
-		dev_err(&core->client->dev,
-			"Failed to configure IC-Link/GPO pins(err = %d)\n",
-			err);
-		return err;
-	}
-
-	err = si476x_core_cmd_ana_audio_pin_cfg(core,
-						core->pinmux.lrout);
-	if (err < 0) {
-		dev_err(&core->client->dev,
-			"Failed to configure analog audio pins(err = %d)\n",
-			err);
-		return err;
-	}
-
-	err = si476x_core_cmd_intb_pin_cfg(core,
-					   core->pinmux.intb,
-					   core->pinmux.a1);
-	if (err < 0) {
-		dev_err(&core->client->dev,
-			"Failed to configure interrupt pins(err = %d)\n",
-			err);
-		return err;
-	}
-
-	return 0;
-}
-
-static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
-{
-	schedule_delayed_work(&core->status_monitor,
-			      usecs_to_jiffies(SI476X_STATUS_POLL_US));
-}
-
-/**
- * si476x_core_start() - early chip startup function
- * @core: Core device structure
- * @soft: When set, this flag forces "soft" startup, where "soft"
- * power down is the one done by sending appropriate command instead
- * of using reset pin of the tuner
- *
- * Perform required startup sequence to correctly power
- * up the chip and perform initial configuration. It does the
- * following sequence of actions:
- *       1. Claims and enables the power supplies VD and VIO1 required
- *          for I2C interface of the chip operation.
- *       2. Waits for 100us, pulls the reset line up, enables irq,
- *          waits for another 100us as it is specified by the
- *          datasheet.
- *       3. Sends 'POWER_UP' command to the device with all provided
- *          information about power-up parameters.
- *       4. Configures, pin multiplexor, disables digital audio and
- *          configures interrupt sources.
- *
- * The function returns zero in case of succes or negative error code
- * otherwise.
- */
-int si476x_core_start(struct si476x_core *core, bool soft)
-{
-	struct i2c_client *client = core->client;
-	int err;
-
-	if (!soft) {
-		if (gpio_is_valid(core->gpio_reset))
-			gpio_set_value_cansleep(core->gpio_reset, 1);
-
-		if (client->irq)
-			enable_irq(client->irq);
-
-		udelay(100);
-
-		if (!client->irq) {
-			atomic_set(&core->is_alive, 1);
-			si476x_core_schedule_polling_work(core);
-		}
-	} else {
-		if (client->irq)
-			enable_irq(client->irq);
-		else {
-			atomic_set(&core->is_alive, 1);
-			si476x_core_schedule_polling_work(core);
-		}
-	}
-
-	err = si476x_core_cmd_power_up(core,
-				       &core->power_up_parameters);
-
-	if (err < 0) {
-		dev_err(&core->client->dev,
-			"Power up failure(err = %d)\n",
-			err);
-		goto disable_irq;
-	}
-
-	if (client->irq)
-		atomic_set(&core->is_alive, 1);
-
-	err = si476x_core_config_pinmux(core);
-	if (err < 0) {
-		dev_err(&core->client->dev,
-			"Failed to configure pinmux(err = %d)\n",
-			err);
-		goto disable_irq;
-	}
-
-	if (client->irq) {
-		err = regmap_write(core->regmap,
-				   SI476X_PROP_INT_CTL_ENABLE,
-				   SI476X_RDSIEN |
-				   SI476X_STCIEN |
-				   SI476X_CTSIEN);
-		if (err < 0) {
-			dev_err(&core->client->dev,
-				"Failed to configure interrupt sources"
-				"(err = %d)\n", err);
-			goto disable_irq;
-		}
-	}
-
-	return 0;
-
-disable_irq:
-	if (err == -ENODEV)
-		atomic_set(&core->is_alive, 0);
-
-	if (client->irq)
-		disable_irq(client->irq);
-	else
-		cancel_delayed_work_sync(&core->status_monitor);
-
-	if (gpio_is_valid(core->gpio_reset))
-		gpio_set_value_cansleep(core->gpio_reset, 0);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(si476x_core_start);
-
-/**
- * si476x_core_stop() - chip power-down function
- * @core: Core device structure
- * @soft: When set, function sends a POWER_DOWN command instead of
- * bringing reset line low
- *
- * Power down the chip by performing following actions:
- * 1. Disable IRQ or stop the polling worker
- * 2. Send the POWER_DOWN command if the power down is soft or bring
- *    reset line low if not.
- *
- * The function returns zero in case of succes or negative error code
- * otherwise.
- */
-int si476x_core_stop(struct si476x_core *core, bool soft)
-{
-	int err = 0;
-	atomic_set(&core->is_alive, 0);
-
-	if (soft) {
-		/* TODO: This probably shoud be a configurable option,
-		 * so it is possible to have the chips keep their
-		 * oscillators running
-		 */
-		struct si476x_power_down_args args = {
-			.xosc = false,
-		};
-		err = si476x_core_cmd_power_down(core, &args);
-	}
-
-	/* We couldn't disable those before
-	 * 'si476x_core_cmd_power_down' since we expect to get CTS
-	 * interrupt */
-	if (core->client->irq)
-		disable_irq(core->client->irq);
-	else
-		cancel_delayed_work_sync(&core->status_monitor);
-
-	if (!soft) {
-		if (gpio_is_valid(core->gpio_reset))
-			gpio_set_value_cansleep(core->gpio_reset, 0);
-	}
-	return err;
-}
-EXPORT_SYMBOL_GPL(si476x_core_stop);
-
-/**
- * si476x_core_set_power_state() - set the level at which the power is
- * supplied for the chip.
- * @core: Core device structure
- * @next_state: enum si476x_power_state describing power state to
- *              switch to.
- *
- * Switch on all the required power supplies
- *
- * This function returns 0 in case of suvccess and negative error code
- * otherwise.
- */
-int si476x_core_set_power_state(struct si476x_core *core,
-				enum si476x_power_state next_state)
-{
-	/*
-	   It is not clear form the datasheet if it is possible to
-	   work with device if not all power domains are operational.
-	   So for now the power-up policy is "power-up all the things!"
-	 */
-	int err = 0;
-
-	if (core->power_state == SI476X_POWER_INCONSISTENT) {
-		dev_err(&core->client->dev,
-			"The device in inconsistent power state\n");
-		return -EINVAL;
-	}
-
-	if (next_state != core->power_state) {
-		switch (next_state) {
-		case SI476X_POWER_UP_FULL:
-			err = regulator_bulk_enable(ARRAY_SIZE(core->supplies),
-						    core->supplies);
-			if (err < 0) {
-				core->power_state = SI476X_POWER_INCONSISTENT;
-				break;
-			}
-			/*
-			 * Startup timing diagram recommends to have a
-			 * 100 us delay between enabling of the power
-			 * supplies and turning the tuner on.
-			 */
-			udelay(100);
-
-			err = si476x_core_start(core, false);
-			if (err < 0)
-				goto disable_regulators;
-
-			core->power_state = next_state;
-			break;
-
-		case SI476X_POWER_DOWN:
-			core->power_state = next_state;
-			err = si476x_core_stop(core, false);
-			if (err < 0)
-				core->power_state = SI476X_POWER_INCONSISTENT;
-disable_regulators:
-			err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
-						     core->supplies);
-			if (err < 0)
-				core->power_state = SI476X_POWER_INCONSISTENT;
-			break;
-		default:
-			BUG();
-		}
-	}
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(si476x_core_set_power_state);
-
-/**
- * si476x_core_report_drainer_stop() - mark the completion of the RDS
- * buffer drain porcess by the worker.
- *
- * @core: Core device structure
- */
-static inline void si476x_core_report_drainer_stop(struct si476x_core *core)
-{
-	mutex_lock(&core->rds_drainer_status_lock);
-	core->rds_drainer_is_working = false;
-	mutex_unlock(&core->rds_drainer_status_lock);
-}
-
-/**
- * si476x_core_start_rds_drainer_once() - start RDS drainer worker if
- * ther is none working, do nothing otherwise
- *
- * @core: Datastructure corresponding to the chip.
- */
-static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
-{
-	mutex_lock(&core->rds_drainer_status_lock);
-	if (!core->rds_drainer_is_working) {
-		core->rds_drainer_is_working = true;
-		schedule_work(&core->rds_fifo_drainer);
-	}
-	mutex_unlock(&core->rds_drainer_status_lock);
-}
-/**
- * si476x_drain_rds_fifo() - RDS buffer drainer.
- * @work: struct work_struct being ppassed to the function by the
- * kernel.
- *
- * Drain the contents of the RDS FIFO of
- */
-static void si476x_core_drain_rds_fifo(struct work_struct *work)
-{
-	int err;
-
-	struct si476x_core *core = container_of(work, struct si476x_core,
-						rds_fifo_drainer);
-
-	struct si476x_rds_status_report report;
-
-	si476x_core_lock(core);
-	err = si476x_core_cmd_fm_rds_status(core, true, false, false, &report);
-	if (!err) {
-		int i = report.rdsfifoused;
-		dev_dbg(&core->client->dev,
-			"%d elements in RDS FIFO. Draining.\n", i);
-		for (; i > 0; --i) {
-			err = si476x_core_cmd_fm_rds_status(core, false, false,
-							    (i == 1), &report);
-			if (err < 0)
-				goto unlock;
-
-			kfifo_in(&core->rds_fifo, report.rds,
-				 sizeof(report.rds));
-			dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
-				(int)sizeof(report.rds), report.rds);
-		}
-		dev_dbg(&core->client->dev, "Drrrrained!\n");
-		wake_up_interruptible(&core->rds_read_queue);
-	}
-
-unlock:
-	si476x_core_unlock(core);
-	si476x_core_report_drainer_stop(core);
-}
-
-/**
- * si476x_core_pronounce_dead()
- *
- * @core: Core device structure
- *
- * Mark the device as being dead and wake up all potentially waiting
- * threads of execution.
- *
- */
-static void si476x_core_pronounce_dead(struct si476x_core *core)
-{
-	dev_info(&core->client->dev, "Core device is dead.\n");
-
-	atomic_set(&core->is_alive, 0);
-
-	/* Wake up al possible waiting processes */
-	wake_up_interruptible(&core->rds_read_queue);
-
-	atomic_set(&core->cts, 1);
-	wake_up(&core->command);
-
-	atomic_set(&core->stc, 1);
-	wake_up(&core->tuning);
-}
-
-/**
- * si476x_core_i2c_xfer()
- *
- * @core: Core device structure
- * @type: Transfer type
- * @buf: Transfer buffer for/with data
- * @count: Transfer buffer size
- *
- * Perfrom and I2C transfer(either read or write) and keep a counter
- * of I/O errors. If the error counter rises above the threshold
- * pronounce device dead.
- *
- * The function returns zero on succes or negative error code on
- * failure.
- */
-int si476x_core_i2c_xfer(struct si476x_core *core,
-		    enum si476x_i2c_type type,
-		    char *buf, int count)
-{
-	static int io_errors_count;
-	int err;
-	if (type == SI476X_I2C_SEND)
-		err = i2c_master_send(core->client, buf, count);
-	else
-		err = i2c_master_recv(core->client, buf, count);
-
-	if (err < 0) {
-		if (io_errors_count++ > SI476X_MAX_IO_ERRORS)
-			si476x_core_pronounce_dead(core);
-	} else {
-		io_errors_count = 0;
-	}
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
-
-/**
- * si476x_get_status()
- * @core: Core device structure
- *
- * Get the status byte of the core device by berforming one byte I2C
- * read.
- *
- * The function returns a status value or a negative error code on
- * error.
- */
-static int si476x_core_get_status(struct si476x_core *core)
-{
-	u8 response;
-	int err = si476x_core_i2c_xfer(core, SI476X_I2C_RECV,
-				  &response, sizeof(response));
-
-	return (err < 0) ? err : response;
-}
-
-/**
- * si476x_get_and_signal_status() - IRQ dispatcher
- * @core: Core device structure
- *
- * Dispatch the arrived interrupt request based on the value of the
- * status byte reported by the tuner.
- *
- */
-static void si476x_core_get_and_signal_status(struct si476x_core *core)
-{
-	int status = si476x_core_get_status(core);
-	if (status < 0) {
-		dev_err(&core->client->dev, "Failed to get status\n");
-		return;
-	}
-
-	if (status & SI476X_CTS) {
-		/* Unfortunately completions could not be used for
-		 * signalling CTS since this flag cannot be cleared
-		 * in status byte, and therefore once it becomes true
-		 * multiple calls to 'complete' would cause the
-		 * commands following the current one to be completed
-		 * before they actually are */
-		dev_dbg(&core->client->dev, "[interrupt] CTSINT\n");
-		atomic_set(&core->cts, 1);
-		wake_up(&core->command);
-	}
-
-	if (status & SI476X_FM_RDS_INT) {
-		dev_dbg(&core->client->dev, "[interrupt] RDSINT\n");
-		si476x_core_start_rds_drainer_once(core);
-	}
-
-	if (status & SI476X_STC_INT) {
-		dev_dbg(&core->client->dev, "[interrupt] STCINT\n");
-		atomic_set(&core->stc, 1);
-		wake_up(&core->tuning);
-	}
-}
-
-static void si476x_core_poll_loop(struct work_struct *work)
-{
-	struct si476x_core *core = SI476X_WORK_TO_CORE(work);
-
-	si476x_core_get_and_signal_status(core);
-
-	if (atomic_read(&core->is_alive))
-		si476x_core_schedule_polling_work(core);
-}
-
-static irqreturn_t si476x_core_interrupt(int irq, void *dev)
-{
-	struct si476x_core *core = dev;
-
-	si476x_core_get_and_signal_status(core);
-
-	return IRQ_HANDLED;
-}
-
-/**
- * si476x_firmware_version_to_revision()
- * @core: Core device structure
- * @major:  Firmware major number
- * @minor1: Firmware first minor number
- * @minor2: Firmware second minor number
- *
- * Convert a chip's firmware version number into an offset that later
- * will be used to as offset in "vtable" of tuner functions
- *
- * This function returns a positive offset in case of success and a -1
- * in case of failure.
- */
-static int si476x_core_fwver_to_revision(struct si476x_core *core,
-					 int func, int major,
-					 int minor1, int minor2)
-{
-	switch (func) {
-	case SI476X_FUNC_FM_RECEIVER:
-		switch (major) {
-		case 5:
-			return SI476X_REVISION_A10;
-		case 8:
-			return SI476X_REVISION_A20;
-		case 10:
-			return SI476X_REVISION_A30;
-		default:
-			goto unknown_revision;
-		}
-	case SI476X_FUNC_AM_RECEIVER:
-		switch (major) {
-		case 5:
-			return SI476X_REVISION_A10;
-		case 7:
-			return SI476X_REVISION_A20;
-		case 9:
-			return SI476X_REVISION_A30;
-		default:
-			goto unknown_revision;
-		}
-	case SI476X_FUNC_WB_RECEIVER:
-		switch (major) {
-		case 3:
-			return SI476X_REVISION_A10;
-		case 5:
-			return SI476X_REVISION_A20;
-		case 7:
-			return SI476X_REVISION_A30;
-		default:
-			goto unknown_revision;
-		}
-	case SI476X_FUNC_BOOTLOADER:
-	default:		/* FALLTHROUG */
-		BUG();
-		return -1;
-	}
-
-unknown_revision:
-	dev_err(&core->client->dev,
-		"Unsupported version of the firmware: %d.%d.%d, "
-		"reverting to A10 comptible functions\n",
-		major, minor1, minor2);
-
-	return SI476X_REVISION_A10;
-}
-
-/**
- * si476x_get_revision_info()
- * @core: Core device structure
- *
- * Get the firmware version number of the device. It is done in
- * following three steps:
- *    1. Power-up the device
- *    2. Send the 'FUNC_INFO' command
- *    3. Powering the device down.
- *
- * The function return zero on success and a negative error code on
- * failure.
- */
-static int si476x_core_get_revision_info(struct si476x_core *core)
-{
-	int rval;
-	struct si476x_func_info info;
-
-	si476x_core_lock(core);
-	rval = si476x_core_set_power_state(core, SI476X_POWER_UP_FULL);
-	if (rval < 0)
-		goto exit;
-
-	rval = si476x_core_cmd_func_info(core, &info);
-	if (rval < 0)
-		goto power_down;
-
-	core->revision = si476x_core_fwver_to_revision(core, info.func,
-						       info.firmware.major,
-						       info.firmware.minor[0],
-						       info.firmware.minor[1]);
-power_down:
-	si476x_core_set_power_state(core, SI476X_POWER_DOWN);
-exit:
-	si476x_core_unlock(core);
-
-	return rval;
-}
-
-bool si476x_core_has_am(struct si476x_core *core)
-{
-	return core->chip_id == SI476X_CHIP_SI4761 ||
-		core->chip_id == SI476X_CHIP_SI4764;
-}
-EXPORT_SYMBOL_GPL(si476x_core_has_am);
-
-bool si476x_core_has_diversity(struct si476x_core *core)
-{
-	return core->chip_id == SI476X_CHIP_SI4764;
-}
-EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
-
-bool si476x_core_is_a_secondary_tuner(struct si476x_core *core)
-{
-	return si476x_core_has_diversity(core) &&
-		(core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
-		 core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING);
-}
-EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
-
-bool si476x_core_is_a_primary_tuner(struct si476x_core *core)
-{
-	return si476x_core_has_diversity(core) &&
-		(core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
-		 core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING);
-}
-EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
-
-bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core)
-{
-	return si476x_core_has_am(core) &&
-		(core->power_up_parameters.func == SI476X_FUNC_AM_RECEIVER);
-}
-EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
-
-bool si476x_core_is_powered_up(struct si476x_core *core)
-{
-	return core->power_state == SI476X_POWER_UP_FULL;
-}
-EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
-
-static int si476x_core_probe(struct i2c_client *client,
-			     const struct i2c_device_id *id)
-{
-	int rval;
-	struct si476x_core          *core;
-	struct si476x_platform_data *pdata;
-	struct mfd_cell *cell;
-	int              cell_num;
-
-	core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
-	if (!core) {
-		dev_err(&client->dev,
-			"failed to allocate 'struct si476x_core'\n");
-		return -ENOMEM;
-	}
-	core->client = client;
-
-	core->regmap = devm_regmap_init_si476x(core);
-	if (IS_ERR(core->regmap)) {
-		rval = PTR_ERR(core->regmap);
-		dev_err(&client->dev,
-			"Failed to allocate register map: %d\n",
-			rval);
-		return rval;
-	}
-
-	i2c_set_clientdata(client, core);
-
-	atomic_set(&core->is_alive, 0);
-	core->power_state = SI476X_POWER_DOWN;
-
-	pdata = client->dev.platform_data;
-	if (pdata) {
-		memcpy(&core->power_up_parameters,
-		       &pdata->power_up_parameters,
-		       sizeof(core->power_up_parameters));
-
-		core->gpio_reset = -1;
-		if (gpio_is_valid(pdata->gpio_reset)) {
-			rval = gpio_request(pdata->gpio_reset, "si476x reset");
-			if (rval) {
-				dev_err(&client->dev,
-					"Failed to request gpio: %d\n", rval);
-				return rval;
-			}
-			core->gpio_reset = pdata->gpio_reset;
-			gpio_direction_output(core->gpio_reset, 0);
-		}
-
-		core->diversity_mode = pdata->diversity_mode;
-		memcpy(&core->pinmux, &pdata->pinmux,
-		       sizeof(struct si476x_pinmux));
-	} else {
-		dev_err(&client->dev, "No platform data provided\n");
-		return -EINVAL;
-	}
-
-	core->supplies[0].supply = "vd";
-	core->supplies[1].supply = "va";
-	core->supplies[2].supply = "vio1";
-	core->supplies[3].supply = "vio2";
-
-	rval = devm_regulator_bulk_get(&client->dev,
-				       ARRAY_SIZE(core->supplies),
-				       core->supplies);
-	if (rval) {
-		dev_err(&client->dev, "Failet to gett all of the regulators\n");
-		goto free_gpio;
-	}
-
-	mutex_init(&core->cmd_lock);
-	init_waitqueue_head(&core->command);
-	init_waitqueue_head(&core->tuning);
-
-	rval = kfifo_alloc(&core->rds_fifo,
-			   SI476X_DRIVER_RDS_FIFO_DEPTH *
-			   sizeof(struct v4l2_rds_data),
-			   GFP_KERNEL);
-	if (rval) {
-		dev_err(&client->dev, "Could not alloate the FIFO\n");
-		goto free_gpio;
-	}
-	mutex_init(&core->rds_drainer_status_lock);
-	init_waitqueue_head(&core->rds_read_queue);
-	INIT_WORK(&core->rds_fifo_drainer, si476x_core_drain_rds_fifo);
-
-	if (client->irq) {
-		rval = devm_request_threaded_irq(&client->dev,
-						 client->irq, NULL,
-						 si476x_core_interrupt,
-						 IRQF_TRIGGER_FALLING,
-						 client->name, core);
-		if (rval < 0) {
-			dev_err(&client->dev, "Could not request IRQ %d\n",
-				client->irq);
-			goto free_kfifo;
-		}
-		disable_irq(client->irq);
-		dev_dbg(&client->dev, "IRQ requested.\n");
-
-		core->rds_fifo_depth = 20;
-	} else {
-		INIT_DELAYED_WORK(&core->status_monitor,
-				  si476x_core_poll_loop);
-		dev_info(&client->dev,
-			 "No IRQ number specified, will use polling\n");
-
-		core->rds_fifo_depth = 5;
-	}
-
-	core->chip_id = id->driver_data;
-
-	rval = si476x_core_get_revision_info(core);
-	if (rval < 0) {
-		rval = -ENODEV;
-		goto free_kfifo;
-	}
-
-	cell_num = 0;
-
-	cell = &core->cells[SI476X_RADIO_CELL];
-	cell->name = "si476x-radio";
-	cell_num++;
-
-#ifdef CONFIG_SND_SOC_SI476X
-	if ((core->chip_id == SI476X_CHIP_SI4761 ||
-	     core->chip_id == SI476X_CHIP_SI4764)	&&
-	    core->pinmux.dclk == SI476X_DCLK_DAUDIO     &&
-	    core->pinmux.dfs  == SI476X_DFS_DAUDIO      &&
-	    core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT &&
-	    core->pinmux.xout == SI476X_XOUT_TRISTATE) {
-		cell = &core->cells[SI476X_CODEC_CELL];
-		cell->name          = "si476x-codec";
-		cell_num++;
-	}
-#endif
-	rval = mfd_add_devices(&client->dev,
-			       (client->adapter->nr << 8) + client->addr,
-			       core->cells, cell_num,
-			       NULL, 0, NULL);
-	if (!rval)
-		return 0;
-
-free_kfifo:
-	kfifo_free(&core->rds_fifo);
-
-free_gpio:
-	if (gpio_is_valid(core->gpio_reset))
-		gpio_free(core->gpio_reset);
-
-	return rval;
-}
-
-static int si476x_core_remove(struct i2c_client *client)
-{
-	struct si476x_core *core = i2c_get_clientdata(client);
-
-	si476x_core_pronounce_dead(core);
-	mfd_remove_devices(&client->dev);
-
-	if (client->irq)
-		disable_irq(client->irq);
-	else
-		cancel_delayed_work_sync(&core->status_monitor);
-
-	kfifo_free(&core->rds_fifo);
-
-	if (gpio_is_valid(core->gpio_reset))
-		gpio_free(core->gpio_reset);
-
-	return 0;
-}
-
-
-static const struct i2c_device_id si476x_id[] = {
-	{ "si4761", SI476X_CHIP_SI4761 },
-	{ "si4764", SI476X_CHIP_SI4764 },
-	{ "si4768", SI476X_CHIP_SI4768 },
-	{ },
-};
-MODULE_DEVICE_TABLE(i2c, si476x_id);
-
-static struct i2c_driver si476x_core_driver = {
-	.driver		= {
-		.name	= "si476x-core",
-		.owner  = THIS_MODULE,
-	},
-	.probe		= si476x_core_probe,
-	.remove         = si476x_core_remove,
-	.id_table       = si476x_id,
-};
-module_i2c_driver(si476x_core_driver);
-
-
-MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
-MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
-MODULE_LICENSE("GPL");