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    Subject[PATCH 36/61] uio: add the uio_aec driver
    Date
    From: Brandon Philips <brandon@ifup.org>

    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>
    ---
    drivers/uio/Kconfig | 18 +++++
    drivers/uio/Makefile | 1 +
    drivers/uio/uio_aec.c | 175 +++++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 194 insertions(+), 0 deletions(-)
    create mode 100644 drivers/uio/uio_aec.c

    diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
    index 04b954c..7f86534 100644
    --- a/drivers/uio/Kconfig
    +++ b/drivers/uio/Kconfig
    @@ -58,6 +58,24 @@ config UIO_SMX

    If you compile this as a module, it will be called uio_smx.

    +config UIO_AEC
    + tristate "AEC video timestamp device"
    + depends on PCI
    + default n
    + help
    +
    + 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:
    +
    + git clone git://ifup.org/philips/uioport.git
    +
    + If you compile this as a module, it will be called uio_aec.
    +
    config UIO_SERCOS3
    tristate "Automata Sercos III PCI card driver"
    default n
    diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile
    index e695581..5c2586d 100644
    --- a/drivers/uio/Makefile
    +++ b/drivers/uio/Makefile
    @@ -3,4 +3,5 @@ obj-$(CONFIG_UIO_CIF) += uio_cif.o
    obj-$(CONFIG_UIO_PDRV) += uio_pdrv.o
    obj-$(CONFIG_UIO_PDRV_GENIRQ) += uio_pdrv_genirq.o
    obj-$(CONFIG_UIO_SMX) += uio_smx.o
    +obj-$(CONFIG_UIO_AEC) += uio_aec.o
    obj-$(CONFIG_UIO_SERCOS3) += uio_sercos3.o
    diff --git a/drivers/uio/uio_aec.c b/drivers/uio/uio_aec.c
    new file mode 100644
    index 0000000..b7830e9
    --- /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);
    --
    1.6.2


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