Commit 668761ac authored by Hante Meuleman's avatar Hante Meuleman Committed by John W. Linville

brcmfmac: define and use platform specific data for SDIO.

This patch adds support for platform specific data for SDIO
fullmac devices. Currently OOB interrupts are configured by Kconfig
BRCMFMAC_SDIO_OOB but that is now determined dynamically by checking
availibility of platform data.

Cc: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-by: default avatarArend Van Spriel <arend@broadcom.com>
Reviewed-by: default avatarFranky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: default avatarPieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: default avatarPiotr Haber <phaber@broadcom.com>
Signed-off-by: default avatarHante Meuleman <meuleman@broadcom.com>
Signed-off-by: default avatarArend van Spriel <arend@broadcom.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 979c2920
......@@ -37,15 +37,6 @@ config BRCMFMAC_SDIO
IEEE802.11n embedded FullMAC WLAN driver. Say Y if you want to
use the driver for a SDIO wireless card.
config BRCMFMAC_SDIO_OOB
bool "Out of band interrupt support for SDIO interface chipset"
depends on BRCMFMAC_SDIO
---help---
This option enables out-of-band interrupt support for Broadcom
SDIO Wifi chipset using fullmac in order to gain better
performance and deep sleep wake up capability on certain
platforms. Say N if you are unsure.
config BRCMFMAC_USB
bool "USB bus interface support for FullMAC driver"
depends on USB
......
......@@ -25,6 +25,7 @@
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
#include <linux/platform_data/brcmfmac-sdio.h>
#include <defs.h>
#include <brcm_hw_ids.h>
......@@ -37,16 +38,15 @@
#define SDIOH_API_ACCESS_RETRY_LIMIT 2
#ifdef CONFIG_BRCMFMAC_SDIO_OOB
static irqreturn_t brcmf_sdio_irqhandler(int irq, void *dev_id)
static irqreturn_t brcmf_sdio_oob_irqhandler(int irq, void *dev_id)
{
struct brcmf_bus *bus_if = dev_get_drvdata(dev_id);
struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
brcmf_dbg(INTR, "oob intr triggered\n");
brcmf_dbg(INTR, "OOB intr triggered\n");
/*
* out-of-band interrupt is level-triggered which won't
/* out-of-band interrupt is level-triggered which won't
* be cleared until dpc
*/
if (sdiodev->irq_en) {
......@@ -59,72 +59,12 @@ static irqreturn_t brcmf_sdio_irqhandler(int irq, void *dev_id)
return IRQ_HANDLED;
}
int brcmf_sdio_intr_register(struct brcmf_sdio_dev *sdiodev)
{
int ret = 0;
u8 data;
unsigned long flags;
brcmf_dbg(SDIO, "Entering: irq %d\n", sdiodev->irq);
ret = request_irq(sdiodev->irq, brcmf_sdio_irqhandler,
sdiodev->irq_flags, "brcmf_oob_intr",
&sdiodev->func[1]->dev);
if (ret != 0)
return ret;
spin_lock_init(&sdiodev->irq_en_lock);
spin_lock_irqsave(&sdiodev->irq_en_lock, flags);
sdiodev->irq_en = true;
spin_unlock_irqrestore(&sdiodev->irq_en_lock, flags);
ret = enable_irq_wake(sdiodev->irq);
if (ret != 0)
return ret;
sdiodev->irq_wake = true;
sdio_claim_host(sdiodev->func[1]);
/* must configure SDIO_CCCR_IENx to enable irq */
data = brcmf_sdio_regrb(sdiodev, SDIO_CCCR_IENx, &ret);
data |= 1 << SDIO_FUNC_1 | 1 << SDIO_FUNC_2 | 1;
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_IENx, data, &ret);
/* redirect, configure and enable io for interrupt signal */
data = SDIO_SEPINT_MASK | SDIO_SEPINT_OE;
if (sdiodev->irq_flags & IRQF_TRIGGER_HIGH)
data |= SDIO_SEPINT_ACT_HI;
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_BRCM_SEPINT, data, &ret);
sdio_release_host(sdiodev->func[1]);
return 0;
}
int brcmf_sdio_intr_unregister(struct brcmf_sdio_dev *sdiodev)
{
brcmf_dbg(SDIO, "Entering\n");
sdio_claim_host(sdiodev->func[1]);
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_BRCM_SEPINT, 0, NULL);
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_IENx, 0, NULL);
sdio_release_host(sdiodev->func[1]);
if (sdiodev->irq_wake) {
disable_irq_wake(sdiodev->irq);
sdiodev->irq_wake = false;
}
free_irq(sdiodev->irq, &sdiodev->func[1]->dev);
sdiodev->irq_en = false;
return 0;
}
#else /* CONFIG_BRCMFMAC_SDIO_OOB */
static void brcmf_sdio_irqhandler(struct sdio_func *func)
static void brcmf_sdio_ib_irqhandler(struct sdio_func *func)
{
struct brcmf_bus *bus_if = dev_get_drvdata(&func->dev);
struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
brcmf_dbg(INTR, "ib intr triggered\n");
brcmf_dbg(INTR, "IB intr triggered\n");
brcmf_sdbrcm_isr(sdiodev->bus);
}
......@@ -136,12 +76,56 @@ static void brcmf_sdio_dummy_irqhandler(struct sdio_func *func)
int brcmf_sdio_intr_register(struct brcmf_sdio_dev *sdiodev)
{
brcmf_dbg(SDIO, "Entering\n");
int ret = 0;
u8 data;
unsigned long flags;
sdio_claim_host(sdiodev->func[1]);
sdio_claim_irq(sdiodev->func[1], brcmf_sdio_irqhandler);
sdio_claim_irq(sdiodev->func[2], brcmf_sdio_dummy_irqhandler);
sdio_release_host(sdiodev->func[1]);
if ((sdiodev->pdata) && (sdiodev->pdata->oob_irq_supported)) {
brcmf_dbg(SDIO, "Enter, register OOB IRQ %d\n",
sdiodev->pdata->oob_irq_nr);
ret = request_irq(sdiodev->pdata->oob_irq_nr,
brcmf_sdio_oob_irqhandler,
sdiodev->pdata->oob_irq_flags,
"brcmf_oob_intr",
&sdiodev->func[1]->dev);
if (ret != 0) {
brcmf_err("request_irq failed %d\n", ret);
return ret;
}
sdiodev->oob_irq_requested = true;
spin_lock_init(&sdiodev->irq_en_lock);
spin_lock_irqsave(&sdiodev->irq_en_lock, flags);
sdiodev->irq_en = true;
spin_unlock_irqrestore(&sdiodev->irq_en_lock, flags);
ret = enable_irq_wake(sdiodev->pdata->oob_irq_nr);
if (ret != 0) {
brcmf_err("enable_irq_wake failed %d\n", ret);
return ret;
}
sdiodev->irq_wake = true;
sdio_claim_host(sdiodev->func[1]);
/* must configure SDIO_CCCR_IENx to enable irq */
data = brcmf_sdio_regrb(sdiodev, SDIO_CCCR_IENx, &ret);
data |= 1 << SDIO_FUNC_1 | 1 << SDIO_FUNC_2 | 1;
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_IENx, data, &ret);
/* redirect, configure and enable io for interrupt signal */
data = SDIO_SEPINT_MASK | SDIO_SEPINT_OE;
if (sdiodev->pdata->oob_irq_flags & IRQF_TRIGGER_HIGH)
data |= SDIO_SEPINT_ACT_HI;
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_BRCM_SEPINT, data, &ret);
sdio_release_host(sdiodev->func[1]);
} else {
brcmf_dbg(SDIO, "Entering\n");
sdio_claim_host(sdiodev->func[1]);
sdio_claim_irq(sdiodev->func[1], brcmf_sdio_ib_irqhandler);
sdio_claim_irq(sdiodev->func[2], brcmf_sdio_dummy_irqhandler);
sdio_release_host(sdiodev->func[1]);
}
return 0;
}
......@@ -150,14 +134,31 @@ int brcmf_sdio_intr_unregister(struct brcmf_sdio_dev *sdiodev)
{
brcmf_dbg(SDIO, "Entering\n");
sdio_claim_host(sdiodev->func[1]);
sdio_release_irq(sdiodev->func[2]);
sdio_release_irq(sdiodev->func[1]);
sdio_release_host(sdiodev->func[1]);
if ((sdiodev->pdata) && (sdiodev->pdata->oob_irq_supported)) {
sdio_claim_host(sdiodev->func[1]);
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_BRCM_SEPINT, 0, NULL);
brcmf_sdio_regwb(sdiodev, SDIO_CCCR_IENx, 0, NULL);
sdio_release_host(sdiodev->func[1]);
if (sdiodev->oob_irq_requested) {
sdiodev->oob_irq_requested = false;
if (sdiodev->irq_wake) {
disable_irq_wake(sdiodev->pdata->oob_irq_nr);
sdiodev->irq_wake = false;
}
free_irq(sdiodev->pdata->oob_irq_nr,
&sdiodev->func[1]->dev);
sdiodev->irq_en = false;
}
} else {
sdio_claim_host(sdiodev->func[1]);
sdio_release_irq(sdiodev->func[2]);
sdio_release_irq(sdiodev->func[1]);
sdio_release_host(sdiodev->func[1]);
}
return 0;
}
#endif /* CONFIG_BRCMFMAC_SDIO_OOB */
int
brcmf_sdcard_set_sbaddr_window(struct brcmf_sdio_dev *sdiodev, u32 address)
......
......@@ -26,6 +26,7 @@
#include <linux/sched.h> /* request_irq() */
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/platform_data/brcmfmac-sdio.h>
#include <net/cfg80211.h>
#include <defs.h>
......@@ -62,14 +63,8 @@ static const struct sdio_device_id brcmf_sdmmc_ids[] = {
};
MODULE_DEVICE_TABLE(sdio, brcmf_sdmmc_ids);
#ifdef CONFIG_BRCMFMAC_SDIO_OOB
static struct list_head oobirq_lh;
struct brcmf_sdio_oobirq {
unsigned int irq;
unsigned long flags;
struct list_head list;
};
#endif /* CONFIG_BRCMFMAC_SDIO_OOB */
static struct brcmfmac_sdio_platform_data *brcmfmac_sdio_pdata;
static bool
brcmf_pm_resume_error(struct brcmf_sdio_dev *sdiodev)
......@@ -428,33 +423,6 @@ void brcmf_sdioh_detach(struct brcmf_sdio_dev *sdiodev)
}
#ifdef CONFIG_BRCMFMAC_SDIO_OOB
static int brcmf_sdio_getintrcfg(struct brcmf_sdio_dev *sdiodev)
{
struct brcmf_sdio_oobirq *oobirq_entry;
if (list_empty(&oobirq_lh)) {
brcmf_err("no valid oob irq resource\n");
return -ENXIO;
}
oobirq_entry = list_first_entry(&oobirq_lh, struct brcmf_sdio_oobirq,
list);
sdiodev->irq = oobirq_entry->irq;
sdiodev->irq_flags = oobirq_entry->flags;
list_del(&oobirq_entry->list);
kfree(oobirq_entry);
return 0;
}
#else
static inline int brcmf_sdio_getintrcfg(struct brcmf_sdio_dev *sdiodev)
{
return 0;
}
#endif /* CONFIG_BRCMFMAC_SDIO_OOB */
static int brcmf_ops_sdio_probe(struct sdio_func *func,
const struct sdio_device_id *id)
{
......@@ -495,15 +463,13 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
dev_set_drvdata(&func->dev, bus_if);
dev_set_drvdata(&sdiodev->func[1]->dev, bus_if);
sdiodev->dev = &sdiodev->func[1]->dev;
sdiodev->pdata = brcmfmac_sdio_pdata;
atomic_set(&sdiodev->suspend, false);
init_waitqueue_head(&sdiodev->request_byte_wait);
init_waitqueue_head(&sdiodev->request_word_wait);
init_waitqueue_head(&sdiodev->request_chain_wait);
init_waitqueue_head(&sdiodev->request_buffer_wait);
err = brcmf_sdio_getintrcfg(sdiodev);
if (err)
goto fail;
brcmf_dbg(SDIO, "F2 found, calling brcmf_sdio_probe...\n");
err = brcmf_sdio_probe(sdiodev);
......@@ -598,7 +564,7 @@ static const struct dev_pm_ops brcmf_sdio_pm_ops = {
static struct sdio_driver brcmf_sdmmc_driver = {
.probe = brcmf_ops_sdio_probe,
.remove = brcmf_ops_sdio_remove,
.name = "brcmfmac",
.name = BRCMFMAC_SDIO_PDATA_NAME,
.id_table = brcmf_sdmmc_ids,
#ifdef CONFIG_PM_SLEEP
.drv = {
......@@ -607,72 +573,51 @@ static struct sdio_driver brcmf_sdmmc_driver = {
#endif /* CONFIG_PM_SLEEP */
};
#ifdef CONFIG_BRCMFMAC_SDIO_OOB
static int brcmf_sdio_pd_probe(struct platform_device *pdev)
{
struct resource *res;
struct brcmf_sdio_oobirq *oobirq_entry;
int i, ret;
int ret;
INIT_LIST_HEAD(&oobirq_lh);
brcmf_dbg(SDIO, "Enter\n");
for (i = 0; ; i++) {
res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
if (!res)
break;
brcmfmac_sdio_pdata = pdev->dev.platform_data;
oobirq_entry = kzalloc(sizeof(struct brcmf_sdio_oobirq),
GFP_KERNEL);
if (!oobirq_entry)
return -ENOMEM;
oobirq_entry->irq = res->start;
oobirq_entry->flags = res->flags & IRQF_TRIGGER_MASK;
list_add_tail(&oobirq_entry->list, &oobirq_lh);
}
if (i == 0)
return -ENXIO;
if (brcmfmac_sdio_pdata->power_on)
brcmfmac_sdio_pdata->power_on();
ret = sdio_register_driver(&brcmf_sdmmc_driver);
if (ret)
brcmf_err("sdio_register_driver failed: %d\n", ret);
return ret;
}
static struct platform_driver brcmf_sdio_pd = {
.probe = brcmf_sdio_pd_probe,
.driver = {
.name = "brcmf_sdio_pd"
}
};
void brcmf_sdio_exit(void)
static int brcmf_sdio_pd_remove(struct platform_device *pdev)
{
brcmf_dbg(SDIO, "Enter\n");
if (brcmfmac_sdio_pdata->power_off)
brcmfmac_sdio_pdata->power_off();
sdio_unregister_driver(&brcmf_sdmmc_driver);
platform_driver_unregister(&brcmf_sdio_pd);
return 0;
}
void brcmf_sdio_init(void)
{
int ret;
brcmf_dbg(SDIO, "Enter\n");
ret = platform_driver_register(&brcmf_sdio_pd);
static struct platform_driver brcmf_sdio_pd = {
.remove = brcmf_sdio_pd_remove,
.driver = {
.name = BRCMFMAC_SDIO_PDATA_NAME
}
};
if (ret)
brcmf_err("platform_driver_register failed: %d\n", ret);
}
#else
void brcmf_sdio_exit(void)
{
brcmf_dbg(SDIO, "Enter\n");
sdio_unregister_driver(&brcmf_sdmmc_driver);
if (brcmfmac_sdio_pdata)
platform_driver_unregister(&brcmf_sdio_pd);
else
sdio_unregister_driver(&brcmf_sdmmc_driver);
}
void brcmf_sdio_init(void)
......@@ -681,9 +626,12 @@ void brcmf_sdio_init(void)
brcmf_dbg(SDIO, "Enter\n");
ret = sdio_register_driver(&brcmf_sdmmc_driver);
ret = platform_driver_probe(&brcmf_sdio_pd, brcmf_sdio_pd_probe);
if (ret == -ENODEV) {
brcmf_dbg(SDIO, "No platform data available, registering without.\n");
ret = sdio_register_driver(&brcmf_sdmmc_driver);
}
if (ret)
brcmf_err("sdio_register_driver failed: %d\n", ret);
brcmf_err("driver registration failed: %d\n", ret);
}
#endif /* CONFIG_BRCMFMAC_SDIO_OOB */
......@@ -31,6 +31,7 @@
#include <linux/bcma/bcma.h>
#include <linux/debugfs.h>
#include <linux/vmalloc.h>
#include <linux/platform_data/brcmfmac-sdio.h>
#include <asm/unaligned.h>
#include <defs.h>
#include <brcmu_wifi.h>
......@@ -517,7 +518,7 @@ static int qcount[NUMPRIO];
static int tx_packets[NUMPRIO];
#endif /* DEBUG */
#define SDIO_DRIVE_STRENGTH 6 /* in milliamps */
#define DEFAULT_SDIO_DRIVE_STRENGTH 6 /* in milliamps */
#define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)
......@@ -2046,23 +2047,19 @@ static void brcmf_sdbrcm_bus_stop(struct device *dev)
bus->tx_seq = bus->rx_seq = 0;
}
#ifdef CONFIG_BRCMFMAC_SDIO_OOB
static inline void brcmf_sdbrcm_clrintr(struct brcmf_sdio *bus)
{
unsigned long flags;
spin_lock_irqsave(&bus->sdiodev->irq_en_lock, flags);
if (!bus->sdiodev->irq_en && !atomic_read(&bus->ipend)) {
enable_irq(bus->sdiodev->irq);
bus->sdiodev->irq_en = true;
if (bus->sdiodev->oob_irq_requested) {
spin_lock_irqsave(&bus->sdiodev->irq_en_lock, flags);
if (!bus->sdiodev->irq_en && !atomic_read(&bus->ipend)) {
enable_irq(bus->sdiodev->pdata->oob_irq_nr);
bus->sdiodev->irq_en = true;
}
spin_unlock_irqrestore(&bus->sdiodev->irq_en_lock, flags);
}
spin_unlock_irqrestore(&bus->sdiodev->irq_en_lock, flags);
}
#else
static inline void brcmf_sdbrcm_clrintr(struct brcmf_sdio *bus)
{
}
#endif /* CONFIG_BRCMFMAC_SDIO_OOB */
static inline void brcmf_sdbrcm_adddpctsk(struct brcmf_sdio *bus)
{
......@@ -3639,6 +3636,7 @@ brcmf_sdbrcm_probe_attach(struct brcmf_sdio *bus, u32 regsva)
int err = 0;
int reg_addr;
u32 reg_val;
u32 drivestrength;
bus->alp_only = true;
......@@ -3679,8 +3677,11 @@ brcmf_sdbrcm_probe_attach(struct brcmf_sdio *bus, u32 regsva)
goto fail;
}
brcmf_sdio_chip_drivestrengthinit(bus->sdiodev, bus->ci,
SDIO_DRIVE_STRENGTH);
if ((bus->sdiodev->pdata) && (bus->sdiodev->pdata->drive_strength))
drivestrength = bus->sdiodev->pdata->drive_strength;
else
drivestrength = DEFAULT_SDIO_DRIVE_STRENGTH;
brcmf_sdio_chip_drivestrengthinit(bus->sdiodev, bus->ci, drivestrength);
/* Get info on the SOCRAM cores... */
bus->ramsize = bus->ci->ramsize;
......
......@@ -174,13 +174,11 @@ struct brcmf_sdio_dev {
wait_queue_head_t request_buffer_wait;
struct device *dev;
struct brcmf_bus *bus_if;
#ifdef CONFIG_BRCMFMAC_SDIO_OOB
unsigned int irq; /* oob interrupt number */
unsigned long irq_flags; /* board specific oob flags */
struct brcmfmac_sdio_platform_data *pdata;
bool oob_irq_requested;
bool irq_en; /* irq enable flags */
spinlock_t irq_en_lock;
bool irq_wake; /* irq wake enable flags */
#endif /* CONFIG_BRCMFMAC_SDIO_OOB */
};
/* Register/deregister interrupt handler. */
......
/*
* Copyright (c) 2013 Broadcom Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _LINUX_BRCMFMAC_PLATFORM_H
#define _LINUX_BRCMFMAC_PLATFORM_H
/*
* Platform specific driver functions and data. Through the platform specific
* device data functions can be provided to help the brcmfmac driver to
* operate with the device in combination with the used platform.
*
* Use the platform data in the following (similar) way:
*
*
#include <brcmfmac_platform.h>
static void brcmfmac_power_on(void)
{
}
static void brcmfmac_power_off(void)
{
}
static void brcmfmac_reset(void)
{
}
static struct brcmfmac_sdio_platform_data brcmfmac_sdio_pdata = {
.power_on = brcmfmac_power_on,
.power_off = brcmfmac_power_off,
.reset = brcmfmac_reset
};
static struct platform_device brcmfmac_device = {
.name = BRCMFMAC_SDIO_PDATA_NAME,
.id = PLATFORM_DEVID_NONE,
.dev.platform_data = &brcmfmac_sdio_pdata
};
void __init brcmfmac_init_pdata(void)
{
brcmfmac_sdio_pdata.oob_irq_supported = true;
brcmfmac_sdio_pdata.oob_irq_nr = gpio_to_irq(GPIO_BRCMF_SDIO_OOB);
brcmfmac_sdio_pdata.oob_irq_flags = IORESOURCE_IRQ |
IORESOURCE_IRQ_HIGHLEVEL;
platform_device_register(&brcmfmac_device);
}
*
*
* Note: the brcmfmac can be loaded as module or be statically built-in into
* the kernel. If built-in then do note that it uses module_init (and
* module_exit) routines which equal device_initcall. So if you intend to
* create a module with the platform specific data for the brcmfmac and have
* it built-in to the kernel then use a higher initcall then device_initcall
* (see init.h). If this is not done then brcmfmac will load without problems
* but will not pickup the platform data.
*
* When the driver does not "detect" platform driver data then it will continue
* without reporting anything and just assume there is no data needed. Which is
* probably true for most platforms.
*
* Explanation of the platform_data fields:
*
* drive_strength: is the preferred drive_strength to be used for the SDIO
* pins. If 0 then a default value will be used. This is the target drive
* strength, the exact drive strength which will be used depends on the
* capabilities of the device.
*
* oob_irq_supported: does the board have support for OOB interrupts. SDIO
* in-band interrupts are relatively slow and for having less overhead on
* interrupt processing an out of band interrupt can be used. If the HW
* supports this then enable this by setting this field to true and configure
* the oob related fields.
*
* oob_irq_nr, oob_irq_flags: the OOB interrupt information. The values are
* used for registering the irq using request_irq function.
*
* power_on: This function is called by the brcmfmac when the module gets
* loaded. This can be particularly useful for low power devices. The platform
* spcific routine may for example decide to power up the complete device.
* If there is no use-case for this function then provide NULL.
*
* power_off: This function is called by the brcmfmac when the module gets
* unloaded. At this point the device can be powered down or otherwise be reset.
* So if an actual power_off is not supported but reset is then reset the device
* when this function gets called. This can be particularly useful for low power
* devices. If there is no use-case for this function (either power-down or
* reset) then provide NULL.
*
* reset: This function can get called if the device communication broke down.
* This functionality is particularly useful in case of SDIO type devices. It is
* possible to reset a dongle via sdio data interface, but it requires that
* this is fully functional. This function is chip/module specific and this
* function should return only after the complete reset has completed.
*/
#define BRCMFMAC_SDIO_PDATA_NAME "brcmfmac_sdio"