target/linux/at91-2.6/patches/003-gpio-driver.patch

   1 --- linux-2.6.21.1.orig/arch/arm/mach-at91/gpio.c       2007-04-27 23:49:26.000000000 +0200
   2 +++ linux-2.6.21.1/arch/arm/mach-at91/gpio.c    2007-05-28 15:30:48.000000000 +0200
   3 @@ -27,6 +27,7 @@
   4
   5  static struct at91_gpio_bank *gpio;
   6  static int gpio_banks;
   7 +static u32 pio_gpio_pin[4] = { 0, 0, 0, 0 };
   8
   9
  10  static inline void __iomem *pin_to_controller(unsigned pin)
  11 @@ -71,9 +72,13 @@
  12  {
  13         void __iomem    *pio = pin_to_controller(pin);
  14         unsigned        mask = pin_to_mask(pin);
  15 +       int bank = (pin - PIN_BASE) / 32;
  16
  17         if (!pio)
  18                 return -EINVAL;
  19 +
  20 +       pio_gpio_pin[bank] |= mask;
  21 +
  22         __raw_writel(mask, pio + PIO_IDR);
  23         __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
  24         __raw_writel(mask, pio + PIO_PER);
  25 @@ -130,10 +135,13 @@
  26  {
  27         void __iomem    *pio = pin_to_controller(pin);
  28         unsigned        mask = pin_to_mask(pin);
  29 +       int bank = (pin - PIN_BASE) / 32;
  30
  31         if (!pio)
  32                 return -EINVAL;
  33
  34 +       pio_gpio_pin[bank] |= mask;
  35 +
  36         __raw_writel(mask, pio + PIO_IDR);
  37         __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
  38         __raw_writel(mask, pio + PIO_ODR);
  39 @@ -151,10 +159,13 @@
  40  {
  41         void __iomem    *pio = pin_to_controller(pin);
  42         unsigned        mask = pin_to_mask(pin);
  43 +       int bank = (pin - PIN_BASE) / 32;
  44
  45         if (!pio)
  46                 return -EINVAL;
  47
  48 +       pio_gpio_pin[bank] |= mask;
  49 +
  50         __raw_writel(mask, pio + PIO_IDR);
  51         __raw_writel(mask, pio + PIO_PUDR);
  52         __raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
  53 @@ -262,6 +273,18 @@
  54  }
  55  EXPORT_SYMBOL(at91_get_gpio_value);
  56
  57 +int at91_is_pin_gpio(unsigned pin)
  58 +{
  59 +  void __iomem  *pio = pin_to_controller(pin);
  60 +  unsigned  mask = pin_to_mask(pin);
  61 +  int     bank = (pin - PIN_BASE) / 32;
  62 +
  63 +  if (!pio)
  64 +    return -EINVAL;
  65 +  return (pio_gpio_pin[bank] & mask) != 0;
  66 +}
  67 +EXPORT_SYMBOL(at91_is_pin_gpio);
  68 +
  69  /*--------------------------------------------------------------------------*/
  70
  71  #ifdef CONFIG_PM
  72 --- linux-2.6.21.1.orig/drivers/char/Kconfig    2007-05-28 12:22:29.000000000 +0200
  73 +++ linux-2.6.21.1/drivers/char/Kconfig 2007-05-28 15:37:43.000000000 +0200
  74 @@ -1087,5 +1087,12 @@
  75           The SPI driver gives user mode access to this serial
  76           bus on the AT91RM9200 processor.
  77
  78 +config AT91_VLIO
  79 +  tristate "Versalink LED and GPIO interface"
  80 +  depends on ARCH_AT91RM9200 && MACH_VLINK
  81 +  default n
  82 +  help
  83 +    Provides a handler GPIO's in userspace
  84 +
  85  endmenu
  86
  87 --- linux-2.6.21.1.orig/drivers/char/Makefile   2007-05-28 12:22:29.000000000 +0200
  88 +++ linux-2.6.21.1/drivers/char/Makefile        2007-05-28 15:38:11.000000000 +0200
  89 @@ -95,6 +95,7 @@
  90  obj-$(CONFIG_TELCLOCK)         += tlclk.o
  91  obj-$(CONFIG_AT91_SPI)         += at91_spi.o
  92  obj-$(CONFIG_AT91_SPIDEV)      += at91_spidev.o
  93 +obj-$(CONFIG_AT91_VLIO)  += vlink_giu.o
  94
  95  obj-$(CONFIG_WATCHDOG)         += watchdog/
  96  obj-$(CONFIG_MWAVE)            += mwave/
  97 --- linux-2.6.21.1.orig/drivers/char/vlink_giu.c        1970-01-01 01:00:00.000000000 +0100
  98 +++ linux-2.6.21.1/drivers/char/vlink_giu.c     2007-05-28 15:39:47.000000000 +0200
  99 @@ -0,0 +1,256 @@
 100 +/*
 101 + *  Driver for FDL Versalink GPIO
 102 + *
 103 + *  Copyright (C) 2005 Guthrie Consulting
 104 + *     Author: Hamish Guthrie <hamish@prodigi.ch>
 105 + *
 106 + *  This program is free software; you can redistribute it and/or modify
 107 + *  it under the terms of the GNU General Public License as published by
 108 + *  the Free Software Foundation; either version 2 of the License, or
 109 + *  (at your option) any later version.
 110 + *
 111 + *  This program is distributed in the hope that it will be useful,
 112 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 113 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 114 + *  GNU General Public License for more details.
 115 + *
 116 + *  You should have received a copy of the GNU General Public License
 117 + *  along with this program; if not, write to the Free Software
 118 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 119 + */
 120 +
 121 +#include <linux/module.h>
 122 +#include <linux/moduleparam.h>
 123 +#include <linux/init.h>
 124 +#include <linux/platform_device.h>
 125 +
 126 +#include <linux/kernel.h>
 127 +#include <linux/slab.h>
 128 +#include <linux/fs.h>
 129 +#include <linux/errno.h>
 130 +#include <linux/init.h>
 131 +#include <linux/types.h>
 132 +#include <linux/proc_fs.h>
 133 +#include <linux/fcntl.h>
 134 +#include <linux/seq_file.h>
 135 +#include <linux/cdev.h>
 136 +#include <asm/arch/gpio.h>
 137 +#include <asm/uaccess.h>
 138 +
 139 +static int major;      /* default is dynamic major device number */
 140 +module_param(major, int, 0);
 141 +MODULE_PARM_DESC(major, "Major device number");
 142 +
 143 +#define VIO_NR_DEVS 96
 144 +
 145 +struct vio_dev {
 146 +       struct cdev cdev;
 147 +};
 148 +
 149 +struct vio_dev *vio_devices;
 150 +static struct class *vio_class;
 151 +
 152 +static ssize_t gpio_read(struct file *file, char __user *buf, size_t len,
 153 +                         loff_t *ppos)
 154 +{
 155 +       unsigned int pin;
 156 +       int retval;
 157 +       char value = '0';
 158 +
 159 +       pin = iminor(file->f_dentry->d_inode);
 160 +
 161 +       retval = at91_get_gpio_value(PIN_BASE + pin);
 162 +       if (retval < 0)
 163 +               return -EFAULT;
 164 +
 165 +       value = retval + 0x30;
 166 +       if (put_user(value, buf))
 167 +               return -EFAULT;
 168 +
 169 +       return 1;
 170 +}
 171 +
 172 +static ssize_t gpio_write(struct file *file, const char __user *data,
 173 +                          size_t len, loff_t *ppos)
 174 +{
 175 +       unsigned int pin;
 176 +       size_t i;
 177 +       char c;
 178 +       int retval = 0;
 179 +
 180 +       pin = iminor(file->f_dentry->d_inode);
 181 +
 182 +       for (i = 0; i < len; i++) {
 183 +               if (get_user(c, data + i))
 184 +                       return -EFAULT;
 185 +
 186 +               switch (c) {
 187 +               case '0':
 188 +               case '1':
 189 +                       retval = at91_set_gpio_value(PIN_BASE + pin, (int)c - 0x30);
 190 +                       if (retval < 0)
 191 +                               return -EFAULT;
 192 +                       break;
 193 +               default:
 194 +                       break;
 195 +               }
 196 +
 197 +               if (retval < 0)
 198 +                       break;
 199 +       }
 200 +
 201 +       return i;
 202 +}
 203 +
 204 +static int gpio_open(struct inode *inode, struct file *file)
 205 +{
 206 +       return nonseekable_open(inode, file);
 207 +}
 208 +
 209 +static int gpio_release(struct inode *inode, struct file *file)
 210 +{
 211 +       return 0;
 212 +}
 213 +
 214 +static struct file_operations vio_fops = {
 215 +       .owner          = THIS_MODULE,
 216 +       .read           = gpio_read,
 217 +       .write          = gpio_write,
 218 +       .open           = gpio_open,
 219 +       .release        = gpio_release,
 220 +};
 221 +
 222 +static void vio_setup_cdev(struct vio_dev *dev, int index)
 223 +{
 224 +       int err, devno = MKDEV(major, index);
 225 +
 226 +       cdev_init(&dev->cdev, &vio_fops);
 227 +       dev->cdev.owner = THIS_MODULE;
 228 +       dev->cdev.ops = &vio_fops;
 229 +       err = cdev_add (&dev->cdev, devno, 1);
 230 +       if (err)
 231 +               printk(KERN_NOTICE "vio: Error %d adding vio%d", err, index);
 232 +}
 233 +
 234 +static int vio_remove(struct platform_device *dev)
 235 +{
 236 +       int i;
 237 +       dev_t devno = MKDEV(major, 0);
 238 +
 239 +       if (vio_devices) {
 240 +               for(i=0; i<VIO_NR_DEVS; i++) {
 241 +                       int iodev = at91_is_pin_gpio(PIN_BASE + i);
 242 +                       if (iodev) {
 243 +                               cdev_del(&vio_devices[i].cdev);
 244 +                               class_device_destroy(vio_class, MKDEV(major, i));
 245 +                       }
 246 +               }
 247 +               kfree(vio_devices);
 248 +       }
 249 +
 250 +       class_destroy(vio_class);
 251 +       unregister_chrdev_region(devno, VIO_NR_DEVS);
 252 +
 253 +       platform_set_drvdata(dev, NULL);
 254 +
 255 +       return 0;
 256 +}
 257 +
 258 +static int vio_probe(struct platform_device *dev)
 259 +{
 260 +       int retval, i, j;
 261 +       dev_t vdev = 0;
 262 +
 263 +       if (major) {
 264 +               vdev = MKDEV(major, 0);
 265 +               retval = register_chrdev_region(vdev, VIO_NR_DEVS, "vio");
 266 +       } else {
 267 +               retval = alloc_chrdev_region(&vdev, 0, VIO_NR_DEVS, "vio");
 268 +               major = MAJOR(vdev);
 269 +       }
 270 +       if (retval < 0) {
 271 +               printk(KERN_WARNING "vio: can't get major %d\n", major);
 272 +               return retval;
 273 +       }
 274 +
 275 +       if (major == 0) {
 276 +               major = retval;
 277 +               printk(KERN_INFO "vio: major number %d\n", major);
 278 +       }
 279 +
 280 +       vio_class = class_create(THIS_MODULE, "vio");
 281 +
 282 +       if (IS_ERR(vio_class)) {
 283 +               printk(KERN_ERR "vio: Error creating vio class\n");
 284 +               vio_remove(dev);
 285 +               return PTR_ERR(vio_class);
 286 +       }
 287 +
 288 +       vio_devices = kmalloc(VIO_NR_DEVS * sizeof(struct vio_dev), GFP_KERNEL);
 289 +       if (!vio_devices) {
 290 +               retval = -ENOMEM;
 291 +               goto fail;
 292 +       }
 293 +       memset(vio_devices, 0, VIO_NR_DEVS * sizeof(struct vio_dev));
 294 +
 295 +       for (i=0; i<VIO_NR_DEVS/32; i++)
 296 +               for(j=0; j<32; j++) {
 297 +                       int iodev = at91_is_pin_gpio(PIN_BASE + i*32 + j);
 298 +                       if (iodev) {
 299 +                               vio_setup_cdev(&vio_devices[i*32 + j], i*32 + j);
 300 +                               class_device_create(vio_class, NULL, MKDEV(major, i*32 + j), NULL,
 301 +                                       "vio%c%d", i + 'A', j);
 302 +                       }
 303 +               }
 304 +
 305 +       platform_set_drvdata(dev, vio_devices);
 306 +
 307 +       return 0;
 308 +
 309 +fail:
 310 +       vio_remove(dev);
 311 +       return retval;
 312 +}
 313 +
 314 +static struct platform_device *vio_platform_device;
 315 +
 316 +static struct platform_driver vio_driver = {
 317 +       .probe          = vio_probe,
 318 +       .remove         = vio_remove,
 319 +       .driver         = {
 320 +               .name   = "vio",
 321 +               .owner  = THIS_MODULE,
 322 +       },
 323 +};
 324 +
 325 +static int __init vio_init(void)
 326 +{
 327 +       int retval;
 328 +
 329 +       vio_platform_device = platform_device_register_simple("vio", -1, NULL, 0);
 330 +       if (IS_ERR(vio_platform_device)) {
 331 +               printk(KERN_WARNING "vio: device registration failed\n");
 332 +               return PTR_ERR(vio_platform_device);
 333 +       }
 334 +
 335 +       retval = platform_driver_register(&vio_driver);
 336 +       if (retval < 0) {
 337 +               printk(KERN_WARNING "vio: driver registration failed\n");
 338 +               platform_device_unregister(vio_platform_device);
 339 +       }
 340 +
 341 +       return retval;
 342 +}
 343 +
 344 +static void __exit vio_exit(void)
 345 +{
 346 +       platform_driver_unregister(&vio_driver);
 347 +       platform_device_unregister(vio_platform_device);
 348 +}
 349 +
 350 +module_init(vio_init);
 351 +module_exit(vio_exit);
 352 +
 353 +MODULE_AUTHOR("Hamish Guthrie <hamish@prodigi.ch>");
 354 +MODULE_DESCRIPTION("FDL Versalink GPIO Driver");
 355 +MODULE_LICENSE("GPL");