| Alessandro Rubini | 056d83f | 2013-06-18 23:47:46 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 CERN (www.cern.ch) |
| 3 | * Author: Alessandro Rubini <rubini@gnudd.com> |
| 4 | * |
| 5 | * Permission to use, copy, modify, and/or distribute this software for any |
| 6 | * purpose with or without fee is hereby granted, provided that the above |
| 7 | * copyright notice and this permission notice appear in all copies. |
| 8 | * |
| 9 | * The software is provided "as is"; the copyright holders disclaim |
| 10 | * all warranties and liabilities, to the extent permitted by |
| 11 | * applicable law. |
| 12 | */ |
| 13 | |
| 14 | /* A trivial fmc driver that can load a gateware file and reports interrupts */ |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/gpio.h> |
| 19 | #include <linux/fmc.h> |
| 20 | |
| 21 | static struct fmc_driver t_drv; /* initialized later */ |
| 22 | |
| 23 | static irqreturn_t t_handler(int irq, void *dev_id) |
| 24 | { |
| 25 | struct fmc_device *fmc = dev_id; |
| 26 | |
| 27 | fmc->op->irq_ack(fmc); |
| 28 | dev_info(&fmc->dev, "received irq %i\n", irq); |
| 29 | return IRQ_HANDLED; |
| 30 | } |
| 31 | |
| 32 | static struct fmc_gpio t_gpio[] = { |
| 33 | { |
| 34 | .gpio = FMC_GPIO_IRQ(0), |
| 35 | .mode = GPIOF_DIR_IN, |
| 36 | .irqmode = IRQF_TRIGGER_RISING, |
| 37 | }, { |
| 38 | .gpio = FMC_GPIO_IRQ(1), |
| 39 | .mode = GPIOF_DIR_IN, |
| 40 | .irqmode = IRQF_TRIGGER_RISING, |
| 41 | } |
| 42 | }; |
| 43 | |
| 44 | static int t_probe(struct fmc_device *fmc) |
| 45 | { |
| 46 | int ret; |
| 47 | int index = 0; |
| 48 | |
| 49 | if (fmc->op->validate) |
| 50 | index = fmc->op->validate(fmc, &t_drv); |
| 51 | if (index < 0) |
| 52 | return -EINVAL; /* not our device: invalid */ |
| 53 | |
| 54 | ret = fmc->op->irq_request(fmc, t_handler, "fmc-trivial", IRQF_SHARED); |
| 55 | if (ret < 0) |
| 56 | return ret; |
| 57 | /* ignore error code of call below, we really don't care */ |
| 58 | fmc->op->gpio_config(fmc, t_gpio, ARRAY_SIZE(t_gpio)); |
| 59 | |
| 60 | /* Reprogram, if asked to. ESRCH == no filename specified */ |
| 61 | ret = -ESRCH; |
| 62 | if (fmc->op->reprogram) |
| 63 | ret = fmc->op->reprogram(fmc, &t_drv, ""); |
| 64 | if (ret == -ESRCH) |
| 65 | ret = 0; |
| 66 | if (ret < 0) |
| 67 | fmc->op->irq_free(fmc); |
| 68 | |
| 69 | /* FIXME: reprogram LM32 too */ |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | static int t_remove(struct fmc_device *fmc) |
| 74 | { |
| 75 | fmc->op->irq_free(fmc); |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static struct fmc_driver t_drv = { |
| 80 | .version = FMC_VERSION, |
| 81 | .driver.name = KBUILD_MODNAME, |
| 82 | .probe = t_probe, |
| 83 | .remove = t_remove, |
| 84 | /* no table, as the current match just matches everything */ |
| 85 | }; |
| 86 | |
| 87 | /* We accept the generic parameters */ |
| 88 | FMC_PARAM_BUSID(t_drv); |
| 89 | FMC_PARAM_GATEWARE(t_drv); |
| 90 | |
| 91 | static int t_init(void) |
| 92 | { |
| 93 | int ret; |
| 94 | |
| 95 | ret = fmc_driver_register(&t_drv); |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | static void t_exit(void) |
| 100 | { |
| 101 | fmc_driver_unregister(&t_drv); |
| 102 | } |
| 103 | |
| 104 | module_init(t_init); |
| 105 | module_exit(t_exit); |
| 106 | |
| 107 | MODULE_LICENSE("Dual BSD/GPL"); |