text: /*
   * 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_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;
  
  	index = fmc_validate(fmc, &t_drv);
  	if (index < 0)
  		return -EINVAL; /* not our device: invalid */
  
  	ret = fmc_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_gpio_config(fmc, t_gpio, ARRAY_SIZE(t_gpio));
  
  	ret = fmc_reprogram(fmc, &t_drv, "", 0);
  	if (ret == -EPERM) /* programming not supported */
  		ret = 0;
  	if (ret < 0)
  		fmc_irq_free(fmc);
  
  	/* FIXME: reprogram LM32 too */
  	return ret;
  }
  
  static int t_remove(struct fmc_device *fmc)
  {
  	fmc_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");
  