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Linux/drivers/uio/uio_aec.c

  1 /*
  2  * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device
  3  *
  4  * Copyright (C) 2008 Brandon Philips <brandon@ifup.org>
  5  *
  6  *   This program is free software; you can redistribute it and/or modify it
  7  *   under the terms of the GNU General Public License version 2 as published
  8  *   by the Free Software Foundation.
  9  *
 10  *   This program is distributed in the hope that it will be useful,
 11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  *   GNU General Public License for more details.
 14  *
 15  *   You should have received a copy of the GNU General Public License along
 16  *   with this program; if not, write to the Free Software Foundation, Inc., 59
 17  *   Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 18  */
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/pci.h>
 23 #include <linux/init.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/cdev.h>
 26 #include <linux/fs.h>
 27 #include <linux/io.h>
 28 #include <linux/uaccess.h>
 29 #include <linux/uio_driver.h>
 30 #include <linux/slab.h>
 31 
 32 #define PCI_VENDOR_ID_AEC 0xaecb
 33 #define PCI_DEVICE_ID_AEC_VITCLTC 0x6250
 34 
 35 #define INT_ENABLE_ADDR         0xFC
 36 #define INT_ENABLE              0x10
 37 #define INT_DISABLE             0x0
 38 
 39 #define INT_MASK_ADDR           0x2E
 40 #define INT_MASK_ALL            0x3F
 41 
 42 #define INTA_DRVR_ADDR          0xFE
 43 #define INTA_ENABLED_FLAG       0x08
 44 #define INTA_FLAG               0x01
 45 
 46 #define MAILBOX                 0x0F
 47 
 48 static struct pci_device_id ids[] = {
 49         { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
 50         { 0, }
 51 };
 52 MODULE_DEVICE_TABLE(pci, ids);
 53 
 54 static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)
 55 {
 56         void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;
 57         unsigned char status = ioread8(int_flag);
 58 
 59 
 60         if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {
 61                 /* application writes 0x00 to 0x2F to get next interrupt */
 62                 status = ioread8(dev_info->priv + MAILBOX);
 63                 return IRQ_HANDLED;
 64         }
 65 
 66         return IRQ_NONE;
 67 }
 68 
 69 static void print_board_data(struct pci_dev *pdev, struct uio_info *i)
 70 {
 71         dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x"
 72                 " revision: %c%c\n",
 73                 ioread8(i->priv + 0x01),
 74                 ioread8(i->priv + 0x00),
 75                 ioread8(i->priv + 0x03),
 76                 ioread8(i->priv + 0x02),
 77                 ioread8(i->priv + 0x06),
 78                 ioread8(i->priv + 0x07));
 79 }
 80 
 81 static int probe(struct pci_dev *pdev, const struct pci_device_id *id)
 82 {
 83         struct uio_info *info;
 84         int ret;
 85 
 86         info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
 87         if (!info)
 88                 return -ENOMEM;
 89 
 90         if (pci_enable_device(pdev))
 91                 goto out_free;
 92 
 93         if (pci_request_regions(pdev, "aectc"))
 94                 goto out_disable;
 95 
 96         info->name = "aectc";
 97         info->port[0].start = pci_resource_start(pdev, 0);
 98         if (!info->port[0].start)
 99                 goto out_release;
100         info->priv = pci_iomap(pdev, 0, 0);
101         if (!info->priv)
102                 goto out_release;
103         info->port[0].size = pci_resource_len(pdev, 0);
104         info->port[0].porttype = UIO_PORT_GPIO;
105 
106         info->version = "0.0.1";
107         info->irq = pdev->irq;
108         info->irq_flags = IRQF_SHARED;
109         info->handler = aectc_irq;
110 
111         print_board_data(pdev, info);
112         ret = uio_register_device(&pdev->dev, info);
113         if (ret)
114                 goto out_unmap;
115 
116         iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR);
117         iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR);
118         if (!(ioread8(info->priv + INTA_DRVR_ADDR)
119                         & INTA_ENABLED_FLAG))
120                 dev_err(&pdev->dev, "aectc: interrupts not enabled\n");
121 
122         pci_set_drvdata(pdev, info);
123 
124         return 0;
125 
126 out_unmap:
127         pci_iounmap(pdev, info->priv);
128 out_release:
129         pci_release_regions(pdev);
130 out_disable:
131         pci_disable_device(pdev);
132 out_free:
133         kfree(info);
134         return -ENODEV;
135 }
136 
137 static void remove(struct pci_dev *pdev)
138 {
139         struct uio_info *info = pci_get_drvdata(pdev);
140 
141         /* disable interrupts */
142         iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR);
143         iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR);
144         /* read mailbox to ensure board drops irq */
145         ioread8(info->priv + MAILBOX);
146 
147         uio_unregister_device(info);
148         pci_release_regions(pdev);
149         pci_disable_device(pdev);
150         iounmap(info->priv);
151 
152         kfree(info);
153 }
154 
155 static struct pci_driver pci_driver = {
156         .name = "aectc",
157         .id_table = ids,
158         .probe = probe,
159         .remove = remove,
160 };
161 
162 module_pci_driver(pci_driver);
163 MODULE_LICENSE("GPL");
164 

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