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
21static struct fmc_driver t_drv; /* initialized later */
22
23static 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
32static 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
44static 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
73static int t_remove(struct fmc_device *fmc)
74{
75	fmc->op->irq_free(fmc);
76	return 0;
77}
78
79static 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 */
88FMC_PARAM_BUSID(t_drv);
89FMC_PARAM_GATEWARE(t_drv);
90
91static int t_init(void)
92{
93	int ret;
94
95	ret = fmc_driver_register(&t_drv);
96	return ret;
97}
98
99static void t_exit(void)
100{
101	fmc_driver_unregister(&t_drv);
102}
103
104module_init(t_init);
105module_exit(t_exit);
106
107MODULE_LICENSE("Dual BSD/GPL");
108