nuttx/boards/arm/kinetis/twr-k64f120m/src/k64_automount.c

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/****************************************************************************
* boards/arm/kinetis/twr-k64f120m/src/k64_automount.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_FS_AUTOMOUNTER_DEBUG) && !defined(CONFIG_DEBUG_FS)
# define CONFIG_DEBUG_FS 1
#endif
#include <assert.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/clock.h>
#include <nuttx/fs/automount.h>
#include "twrk64.h"
#ifdef HAVE_AUTOMOUNTER
/****************************************************************************
* Private Types
****************************************************************************/
2017-02-19 21:58:37 +01:00
/* This structure represents the changeable state of the automounter */
struct k64_automount_state_s
{
volatile automount_handler_t handler; /* Upper half handler */
void *arg; /* Handler argument */
bool enable; /* Fake interrupt enable */
bool pending; /* Set if there an event while disabled */
};
/* This structure represents the static configuration of an automounter */
struct k64_automount_config_s
{
/* This must be first thing in structure so that we can simply cast from
* struct automount_lower_s to struct k64_automount_config_s
*/
struct automount_lower_s lower; /* Publicly visible part */
struct k64_automount_state_s *state; /* Changeable state */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int k64_attach(const struct automount_lower_s *lower,
automount_handler_t isr, void *arg);
static void k64_enable(const struct automount_lower_s *lower,
bool enable);
static bool k64_inserted(const struct automount_lower_s *lower);
/****************************************************************************
* Private Data
****************************************************************************/
static struct k64_automount_state_s g_sdhc_state;
static const struct k64_automount_config_s g_sdhc_config =
{
.lower =
{
.fstype = CONFIG_TWR_K64F120M_SDHC_AUTOMOUNT_FSTYPE,
.blockdev = CONFIG_TWR_K64F120M_SDHC_AUTOMOUNT_BLKDEV,
.mountpoint = CONFIG_TWR_K64F120M_SDHC_AUTOMOUNT_MOUNTPOINT,
.ddelay = MSEC2TICK(CONFIG_TWR_K64F120M_SDHC_AUTOMOUNT_DDELAY),
.udelay = MSEC2TICK(CONFIG_TWR_K64F120M_SDHC_AUTOMOUNT_UDELAY),
.attach = k64_attach,
.enable = k64_enable,
.inserted = k64_inserted
},
.state = &g_sdhc_state
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: k64_attach
*
* Description:
* Attach a new SDHC event handler
*
* Input Parameters:
* lower - An instance of the auto-mounter lower half state structure
* isr - The new event handler to be attach
* arg - Client data to be provided when the event handler is invoked.
*
* Returned Value:
* Always returns OK
*
****************************************************************************/
static int k64_attach(const struct automount_lower_s *lower,
automount_handler_t isr, void *arg)
{
const struct k64_automount_config_s *config;
struct k64_automount_state_s *state;
/* Recover references to our structure */
config = (struct k64_automount_config_s *)lower;
DEBUGASSERT(config != NULL && config->state != NULL);
state = config->state;
/* Save the new handler info (clearing the handler first to eliminate race
* conditions).
*/
state->handler = NULL;
state->pending = false;
state->arg = arg;
state->handler = isr;
return OK;
}
/****************************************************************************
* Name: k64_enable
*
* Description:
* Enable card insertion/removal event detection
*
* Input Parameters:
* lower - An instance of the auto-mounter lower half state structure
* enable - True: enable event detection; False: disable
*
* Returned Value:
* None
*
****************************************************************************/
static void k64_enable(const struct automount_lower_s *lower,
bool enable)
{
const struct k64_automount_config_s *config;
struct k64_automount_state_s *state;
irqstate_t flags;
/* Recover references to our structure */
config = (struct k64_automount_config_s *)lower;
DEBUGASSERT(config != NULL && config->state != NULL);
state = config->state;
/* Save the fake enable setting */
flags = enter_critical_section();
state->enable = enable;
/* Did an interrupt occur while interrupts were disabled? */
if (enable && state->pending)
{
/* Yes.. perform the fake interrupt if the interrupt is attached */
if (state->handler)
{
bool inserted = k64_cardinserted();
state->handler(&config->lower, state->arg, inserted);
}
state->pending = false;
}
leave_critical_section(flags);
}
/****************************************************************************
* Name: k64_inserted
*
* Description:
* Check if a card is inserted into the slot.
*
* Input Parameters:
* lower - An instance of the auto-mounter lower half state structure
*
* Returned Value:
* True if the card is inserted; False otherwise
*
****************************************************************************/
static bool k64_inserted(const struct automount_lower_s *lower)
{
return k64_cardinserted();
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: k64_automount_initialize
*
* Description:
* Configure auto-mounters for each enable and so configured SDHC
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void k64_automount_initialize(void)
{
void *handle;
finfo("Initializing automounter(s)\n");
/* Initialize the SDHC0 auto-mounter */
handle = automount_initialize(&g_sdhc_config.lower);
if (!handle)
{
ferr("ERROR: Failed to initialize auto-mounter for SDHC0\n");
}
}
/****************************************************************************
* Name: k64_automount_event
*
* Description:
* The SDHC card detection logic has detected an insertion or removal
* event.
* It has already scheduled the MMC/SD block driver operations.
* Now we need to schedule the auto-mount event which will occur with a
* substantial delay to make sure that everything has settle down.
*
* Input Parameters:
* slotno - Identifies the SDHC0 slot: SDHC0_SLOTNO or SDHC1_SLOTNO.
* There is a terminology problem here: Each SDHC supports two slots,
* slot A and slot B. Only slot A is used.
* So this is not a really a slot, but an HSCMI peripheral number.
* inserted - True if the card is inserted in the slot. False otherwise.
*
* Returned Value:
* None
*
* Assumptions:
* Interrupts are disabled.
*
****************************************************************************/
void k64_automount_event(bool inserted)
{
const struct k64_automount_config_s *config = &g_sdhc_config;
struct k64_automount_state_s *state = &g_sdhc_state;
/* Is the auto-mounter interrupt attached? */
if (state->handler)
{
/* Yes.. Have we been asked to hold off interrupts? */
if (!state->enable)
{
/* Yes.. just remember that there is a pending interrupt. We will
* deliver the interrupt when interrupts are "re-enabled."
*/
state->pending = true;
}
else
{
/* No.. forward the event to the handler */
state->handler(&config->lower, state->arg, inserted);
}
}
}
#endif /* HAVE_AUTOMOUNTER */