mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-04 11:24:04 +08:00
056d83f3c3
This simple do-nothing mezzanine driver shows how to write a mezzanine driver, that can also handle interrupts reported by the carrier. Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch> Acked-by: Emilio G. Cota <cota@braap.org> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2012 CERN (www.cern.ch)
|
|
* Author: Alessandro Rubini <rubini@gnudd.com>
|
|
*
|
|
* 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"; the copyright holders disclaim
|
|
* all warranties and liabilities, to the extent permitted by
|
|
* applicable law.
|
|
*/
|
|
|
|
/* A trivial fmc driver that can load a gateware file and reports interrupts */
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/fmc.h>
|
|
|
|
static struct fmc_driver t_drv; /* initialized later */
|
|
|
|
static irqreturn_t t_handler(int irq, void *dev_id)
|
|
{
|
|
struct fmc_device *fmc = dev_id;
|
|
|
|
fmc->op->irq_ack(fmc);
|
|
dev_info(&fmc->dev, "received irq %i\n", irq);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct fmc_gpio t_gpio[] = {
|
|
{
|
|
.gpio = FMC_GPIO_IRQ(0),
|
|
.mode = GPIOF_DIR_IN,
|
|
.irqmode = IRQF_TRIGGER_RISING,
|
|
}, {
|
|
.gpio = FMC_GPIO_IRQ(1),
|
|
.mode = GPIOF_DIR_IN,
|
|
.irqmode = IRQF_TRIGGER_RISING,
|
|
}
|
|
};
|
|
|
|
static int t_probe(struct fmc_device *fmc)
|
|
{
|
|
int ret;
|
|
int index = 0;
|
|
|
|
if (fmc->op->validate)
|
|
index = fmc->op->validate(fmc, &t_drv);
|
|
if (index < 0)
|
|
return -EINVAL; /* not our device: invalid */
|
|
|
|
ret = fmc->op->irq_request(fmc, t_handler, "fmc-trivial", IRQF_SHARED);
|
|
if (ret < 0)
|
|
return ret;
|
|
/* ignore error code of call below, we really don't care */
|
|
fmc->op->gpio_config(fmc, t_gpio, ARRAY_SIZE(t_gpio));
|
|
|
|
/* Reprogram, if asked to. ESRCH == no filename specified */
|
|
ret = -ESRCH;
|
|
if (fmc->op->reprogram)
|
|
ret = fmc->op->reprogram(fmc, &t_drv, "");
|
|
if (ret == -ESRCH)
|
|
ret = 0;
|
|
if (ret < 0)
|
|
fmc->op->irq_free(fmc);
|
|
|
|
/* FIXME: reprogram LM32 too */
|
|
return ret;
|
|
}
|
|
|
|
static int t_remove(struct fmc_device *fmc)
|
|
{
|
|
fmc->op->irq_free(fmc);
|
|
return 0;
|
|
}
|
|
|
|
static struct fmc_driver t_drv = {
|
|
.version = FMC_VERSION,
|
|
.driver.name = KBUILD_MODNAME,
|
|
.probe = t_probe,
|
|
.remove = t_remove,
|
|
/* no table, as the current match just matches everything */
|
|
};
|
|
|
|
/* We accept the generic parameters */
|
|
FMC_PARAM_BUSID(t_drv);
|
|
FMC_PARAM_GATEWARE(t_drv);
|
|
|
|
static int t_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = fmc_driver_register(&t_drv);
|
|
return ret;
|
|
}
|
|
|
|
static void t_exit(void)
|
|
{
|
|
fmc_driver_unregister(&t_drv);
|
|
}
|
|
|
|
module_init(t_init);
|
|
module_exit(t_exit);
|
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|