/* * 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");