diff options
Diffstat (limited to 'drivers/misc/altera_sysid.c')
-rw-r--r-- | drivers/misc/altera_sysid.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/misc/altera_sysid.c b/drivers/misc/altera_sysid.c new file mode 100644 index 000000000000..be35530c504b --- /dev/null +++ b/drivers/misc/altera_sysid.c @@ -0,0 +1,141 @@ +/* + * Copyright Altera Corporation (C) 2013. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + * + * Credit: + * Walter Goossens + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/of.h> + +#define DRV_NAME "altera_sysid" + +struct altera_sysid { + void __iomem *regs; +}; + +/* System ID Registers*/ +#define SYSID_REG_ID (0x0) +#define SYSID_REG_TIMESTAMP (0x4) + +static ssize_t altera_sysid_show_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct altera_sysid *sysid = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", readl(sysid->regs + SYSID_REG_ID)); +} + +static ssize_t altera_sysid_show_timestamp(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned int reg; + struct tm timestamp; + struct altera_sysid *sysid = dev_get_drvdata(dev); + + reg = readl(sysid->regs + SYSID_REG_TIMESTAMP); + + time_to_tm(reg, 0, ×tamp); + + return sprintf(buf, "%u (%u-%u-%u %u:%u:%u UTC)\n", reg, + (unsigned int)(timestamp.tm_year + 1900), + timestamp.tm_mon + 1, timestamp.tm_mday, timestamp.tm_hour, + timestamp.tm_min, timestamp.tm_sec); +} + +static DEVICE_ATTR(id, S_IRUGO, altera_sysid_show_id, NULL); +static DEVICE_ATTR(timestamp, S_IRUGO, altera_sysid_show_timestamp, NULL); + +static struct attribute *altera_sysid_attrs[] = { + &dev_attr_id.attr, + &dev_attr_timestamp.attr, + NULL, +}; + +struct attribute_group altera_sysid_attr_group = { + .name = "sysid", + .attrs = altera_sysid_attrs, +}; + +static int altera_sysid_probe(struct platform_device *pdev) +{ + struct altera_sysid *sysid; + struct resource *regs; + + sysid = devm_kzalloc(&pdev->dev, sizeof(struct altera_sysid), + GFP_KERNEL); + if (!sysid) + return -ENOMEM; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) + return -ENXIO; + + sysid->regs = devm_ioremap_resource(&pdev->dev, regs); + if (IS_ERR(sysid->regs)) + return PTR_ERR(sysid->regs); + + platform_set_drvdata(pdev, sysid); + + return sysfs_create_group(&pdev->dev.kobj, &altera_sysid_attr_group); +} + +static int altera_sysid_remove(struct platform_device *pdev) +{ + sysfs_remove_group(&pdev->dev.kobj, &altera_sysid_attr_group); + + platform_set_drvdata(pdev, NULL); + return 0; +} + +static const struct of_device_id altera_sysid_match[] = { + { .compatible = "altr,sysid-1.0" }, + { /* Sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, altera_sysid_match); + +static struct platform_driver altera_sysid_platform_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(altera_sysid_match), + }, + .probe = altera_sysid_probe, + .remove = altera_sysid_remove, +}; + +static int __init altera_sysid_init(void) +{ + return platform_driver_register(&altera_sysid_platform_driver); +} + +static void __exit altera_sysid_exit(void) +{ + platform_driver_unregister(&altera_sysid_platform_driver); +} + +module_init(altera_sysid_init); +module_exit(altera_sysid_exit); + +MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Altera System ID driver"); +MODULE_ALIAS("platform:" DRV_NAME); |