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authorBrandon Philips <brandon@ifup.org>2009-01-27 13:00:04 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:38:24 -0700
commit1bafeb378e915f39b1bf44ee0871823d6f402ea5 (patch)
treec4af6b6a2965d0526eb79aaeb013caa7338140ac /drivers/uio/uio_aec.c
parent8205779114e8f612549d191f8e151526a74ab9f2 (diff)
downloadlinux-1bafeb378e915f39b1bf44ee0871823d6f402ea5.tar.bz2
uio: add the uio_aec driver
UIO driver for the Adrienne Electronics Corporation PCI time code device. This device differs from other UIO devices since it uses I/O ports instead of memory mapped I/O. In order to make it possible for UIO to work with this device a utility, uioport, can be used to read and write the ports. uioport is designed to be a setuid program and checks the permissions of the /dev/uio* node and if the user has write permissions it will use iopl and out*/in* to access the device. [1] git clone git://ifup.org/philips/uioport.git Signed-off-by: Brandon Philips <brandon@ifup.org> Signed-off-by: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/uio/uio_aec.c')
-rw-r--r--drivers/uio/uio_aec.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/uio/uio_aec.c b/drivers/uio/uio_aec.c
new file mode 100644
index 000000000000..b7830e9a3baa
--- /dev/null
+++ b/drivers/uio/uio_aec.c
@@ -0,0 +1,175 @@
+/*
+ * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device
+ *
+ * Copyright (C) 2008 Brandon Philips <brandon@ifup.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/uio_driver.h>
+
+#define PCI_VENDOR_ID_AEC 0xaecb
+#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250
+
+#define INT_ENABLE_ADDR 0xFC
+#define INT_ENABLE 0x10
+#define INT_DISABLE 0x0
+
+#define INT_MASK_ADDR 0x2E
+#define INT_MASK_ALL 0x3F
+
+#define INTA_DRVR_ADDR 0xFE
+#define INTA_ENABLED_FLAG 0x08
+#define INTA_FLAG 0x01
+
+#define MAILBOX 0x0F
+
+static struct pci_device_id ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, ids);
+
+static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)
+{
+ void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;
+ unsigned char status = ioread8(int_flag);
+
+
+ if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {
+ /* application writes 0x00 to 0x2F to get next interrupt */
+ status = ioread8(dev_info->priv + MAILBOX);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static void print_board_data(struct pci_dev *pdev, struct uio_info *i)
+{
+ dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x"
+ " revision: %c%c\n",
+ ioread8(i->priv + 0x01),
+ ioread8(i->priv + 0x00),
+ ioread8(i->priv + 0x03),
+ ioread8(i->priv + 0x02),
+ ioread8(i->priv + 0x06),
+ ioread8(i->priv + 0x07));
+}
+
+static int __devinit probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct uio_info *info;
+ int ret;
+
+ info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ if (pci_enable_device(pdev))
+ goto out_free;
+
+ if (pci_request_regions(pdev, "aectc"))
+ goto out_disable;
+
+ info->name = "aectc";
+ info->port[0].start = pci_resource_start(pdev, 0);
+ if (!info->port[0].start)
+ goto out_release;
+ info->priv = pci_iomap(pdev, 0, 0);
+ if (!info->priv)
+ goto out_release;
+ info->port[0].size = pci_resource_len(pdev, 0);
+ info->port[0].porttype = UIO_PORT_GPIO;
+
+ info->version = "0.0.1";
+ info->irq = pdev->irq;
+ info->irq_flags = IRQF_SHARED;
+ info->handler = aectc_irq;
+
+ print_board_data(pdev, info);
+ ret = uio_register_device(&pdev->dev, info);
+ if (ret)
+ goto out_unmap;
+
+ iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR);
+ iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR);
+ if (!(ioread8(info->priv + INTA_DRVR_ADDR)
+ & INTA_ENABLED_FLAG))
+ dev_err(&pdev->dev, "aectc: interrupts not enabled\n");
+
+ pci_set_drvdata(pdev, info);
+
+ return 0;
+
+out_unmap:
+ pci_iounmap(pdev, info->priv);
+out_release:
+ pci_release_regions(pdev);
+out_disable:
+ pci_disable_device(pdev);
+out_free:
+ kfree(info);
+ return -ENODEV;
+}
+
+static void remove(struct pci_dev *pdev)
+{
+ struct uio_info *info = pci_get_drvdata(pdev);
+
+ /* disable interrupts */
+ iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR);
+ iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR);
+ /* read mailbox to ensure board drops irq */
+ ioread8(info->priv + MAILBOX);
+
+ uio_unregister_device(info);
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+ iounmap(info->priv);
+
+ kfree(info);
+}
+
+static struct pci_driver pci_driver = {
+ .name = "aectc",
+ .id_table = ids,
+ .probe = probe,
+ .remove = remove,
+};
+
+static int __init aectc_init(void)
+{
+ return pci_register_driver(&pci_driver);
+}
+
+static void __exit aectc_exit(void)
+{
+ pci_unregister_driver(&pci_driver);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(aectc_init);
+module_exit(aectc_exit);