projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 056d83f3 AR |
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"); |