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Subject[PATCH v4 3/7] mfd: Add the main bulk of core driver for SI476x code
Date
From: Andrey Smirnov <andreysm@charmander.(none)>

This patch adds main part(out of three) of the I2C driver for the
"core" of MFD device.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
drivers/mfd/si476x-i2c.c | 878 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 878 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..053a6a3
--- /dev/null
+++ b/drivers/mfd/si476x-i2c.c
@@ -0,0 +1,878 @@
+/*
+ * 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",
+ 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 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;
+}
+
+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");
--
1.7.10.4


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