Message-Id: <201211161535.52022.hverkuil@xs4all.nl>
Date:	Fri, 16 Nov 2012 15:35:51 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Andrey Smirnov <andrey.smirnov@...vergeddevices.net>
Cc:	mchehab@...hat.com, sameo@...ux.intel.com,
	broonie@...nsource.wolfsonmicro.com, perex@...ex.cz, tiwai@...e.de,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/6] Add the main bulk of core driver for SI476x code

Hi Andrey,

I'm really sorry for the long delay, but I finally have time to review v4 of this
code.

On Tue October 23 2012 20:44:28 Andrey Smirnov wrote:
> This patch adds main part(out of three) of the I2C driver for the
> "core" of MFD device.
> 
> Signed-off-by: Andrey Smirnov <andrey.smirnov@...vergeddevices.net>
> ---
>  drivers/mfd/si476x-i2c.c |  966 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 966 insertions(+)
>  create mode 100644 drivers/mfd/si476x-i2c.c
> 
> diff --git a/drivers/mfd/si476x-i2c.c b/drivers/mfd/si476x-i2c.c
> new file mode 100644
> index 0000000..6d581bd
> --- /dev/null
> +++ b/drivers/mfd/si476x-i2c.c
> @@ -0,0 +1,966 @@
> +/*
> + * include/media/si476x-i2c.c -- Core device driver for si476x MFD
> + * device
> + *
> + * Copyright (C) 2012 Innovative Converged Devices(ICD)
> + *
> + * Author: Andrey Smirnov <andrey.smirnov@...vergeddevices.net>
> + *
> + * 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>
> +
> +/* Command Timeouts */
> +#define DEFAULT_TIMEOUT				100000
> +#define TIMEOUT_TUNE				700000
> +#define TIMEOUT_POWER_UP			330000
> +
> +#define MAX_IO_ERRORS 10
> +
> +#define SI476X_DRIVER_RDS_FIFO_DEPTH		128
> +
> +#define SI476X_STATUS_POLL_US 0
> +
> +/**
> + * 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(atomic_read(&core->polling_interval)));
> +}
> +
> +/**
> + * 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));
> +			DBG_BUFFER(&core->client->dev, "RDS data:\n",
> +				   report.rds, sizeof(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++ > 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 inline int si476x_core_firmware_version_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) {
> +		rval = si476x_core_cmd_func_info(core, &info);
> +		if (!rval)
> +			core->revision = \
> +				si476x_core_firmware_version_to_revision(core,
> +									 info.func,
> +									 info.firmware.major,
> +									 info.firmware.minor[0],
> +									 info.firmware.minor[1]);
> +		si476x_core_set_power_state(core,
> +					    SI476X_POWER_DOWN);
> +	}
> +
> +	si476x_core_unlock(core);
> +
> +	return rval;
> +}
> +
> +#define ATOMIC_CORE_DEV_ATTR(__attr_name, __field_name)			\
> +	static ssize_t __attr_name##_show(struct device *dev,		\
> +					  struct device_attribute *attr, \
> +					  char *buf)			\
> +	{								\
> +		struct i2c_client  *client;				\
> +		struct si476x_core *core;				\
> +									\
> +		client = container_of(dev, struct i2c_client, dev);	\
> +		core   = i2c_get_clientdata(client);			\
> +									\
> +		return sprintf(buf, "%u", atomic_read(&core->__field_name)); \
> +	}								\
> +	static ssize_t __attr_name##_store(struct device *dev,		\
> +					   struct device_attribute *attr, \
> +					   const char *buf, size_t count) \
> +	{								\
> +		unsigned int delay;					\
> +									\
> +		struct i2c_client  *client;				\
> +		struct si476x_core *core;				\
> +									\
> +		if (sscanf(buf, "%u", &delay) != 1)			\
> +			return -EINVAL;					\
> +									\
> +		client = container_of(dev, struct i2c_client, dev);	\
> +		core   = i2c_get_clientdata(client);			\
> +									\
> +		atomic_set(&core->__field_name, delay);			\
> +		return count;						\
> +	}								\
> +	static DEVICE_ATTR(__attr_name, S_IWUSR|S_IRUGO,		\
> +			   __attr_name##_show, __attr_name##_store)
> +
> +
> +ATOMIC_CORE_DEV_ATTR(polling_interval_us, polling_interval);
> +ATOMIC_CORE_DEV_ATTR(tune_timeout_us, timeouts.tune);
> +ATOMIC_CORE_DEV_ATTR(command_timeout_us, timeouts.command);
> +ATOMIC_CORE_DEV_ATTR(power_up_timeout_us, timeouts.power_up);

Are these attrs really needed? And if so, are they documented somewhere?

I am always somewhat suspicious of exposing such parameters. It is my believe
that that is something the driver should just do correctly.

> +
> +static struct attribute *si476x_core_attrs[] = {
> +	&dev_attr_polling_interval_us.attr,
> +	&dev_attr_tune_timeout_us.attr,
> +	&dev_attr_command_timeout_us.attr,
> +	&dev_attr_power_up_timeout_us.attr,
> +	NULL
> +};
> +
> +static struct attribute_group si476x_core_attr_group = {
> +	.attrs = si476x_core_attrs,
> +};
> +
> +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);
> +
> +static int __devinit 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);
> +
> +	atomic_set(&core->polling_interval, SI476X_STATUS_POLL_US);
> +
> +	atomic_set(&core->timeouts.tune, TIMEOUT_TUNE);
> +	atomic_set(&core->timeouts.power_up, TIMEOUT_POWER_UP);
> +	atomic_set(&core->timeouts.command, DEFAULT_TIMEOUT);
> +
> +	rval = sysfs_create_group(&client->dev.kobj, &si476x_core_attr_group);
> +	if (rval < 0) {
> +		dev_err(&client->dev, "Failed to create sysfs attributes\n");
> +		goto free_kfifo;
> +	}
> +
> +	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_sysfs;
> +		}
> +		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_sysfs;
> +	}
> +
> +	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_sysfs:
> +	sysfs_remove_group(&client->dev.kobj, &si476x_core_attr_group);
> +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);
> +	}
> +
> +	sysfs_remove_group(&client->dev.kobj, &si476x_core_attr_group);
> +
> +	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         = __devexit_p(si476x_core_remove),
> +	.id_table       = si476x_id,
> +};
> +
> +static int __init si476x_core_init(void)
> +{
> +	return i2c_add_driver(&si476x_core_driver);
> +}
> +
> +static void __exit si476x_core_exit(void)
> +{
> +	i2c_del_driver(&si476x_core_driver);
> +}
> +late_initcall(si476x_core_init);
> +module_exit(si476x_core_exit);
> +
> +
> +MODULE_AUTHOR("Andrey Smirnov <andrey.smirnov@...vergeddevices.net>");
> +MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
> +MODULE_LICENSE("GPL");
> 

Regards,

	Hans
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