mfd: si476x: Add the bulk of the core driver
This patch adds main part(out of three) of the I2C driver for the "core" of MFD device. Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Andrey Smirnov
Samuel Ortiz
Родитель
ed4a8fe892
Коммит
730a30ab7f
|
|
@ -0,0 +1,886 @@
|
|||
/*
|
||||
* 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 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");
|
||||
Загрузка…
Ссылка в новой задаче