target/linux/at91/patches-2.6.22/003-gpio-driver.patch

   1 diff -urN linux-2.6.22.1.old/arch/arm/mach-at91/gpio.c linux-2.6.22.1/arch/arm/mach-at91/gpio.c
   2 --- linux-2.6.22.1.old/arch/arm/mach-at91/gpio.c        2007-07-10 20:56:30.000000000 +0200
   3 +++ linux-2.6.22.1/arch/arm/mach-at91/gpio.c    2007-07-29 07:03:30.000000000 +0200
   4 @@ -27,6 +27,7 @@
   5
   6  static struct at91_gpio_bank *gpio;
   7  static int gpio_banks;
   8 +static u32 pio_gpio_pin[4] = { 0, 0, 0, 0 };
   9
  10
  11  static inline void __iomem *pin_to_controller(unsigned pin)
  12 @@ -71,9 +72,13 @@
  13  {
  14         void __iomem    *pio = pin_to_controller(pin);
  15         unsigned        mask = pin_to_mask(pin);
  16 +       int bank = (pin - PIN_BASE) / 32;
  17
  18         if (!pio)
  19                 return -EINVAL;
  20 +
  21 +       pio_gpio_pin[bank] |= mask;
  22 +
  23         __raw_writel(mask, pio + PIO_IDR);
  24         __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
  25         __raw_writel(mask, pio + PIO_PER);
  26 @@ -130,10 +135,13 @@
  27  {
  28         void __iomem    *pio = pin_to_controller(pin);
  29         unsigned        mask = pin_to_mask(pin);
  30 +       int bank = (pin - PIN_BASE) / 32;
  31
  32         if (!pio)
  33                 return -EINVAL;
  34
  35 +       pio_gpio_pin[bank] |= mask;
  36 +
  37         __raw_writel(mask, pio + PIO_IDR);
  38         __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
  39         __raw_writel(mask, pio + PIO_ODR);
  40 @@ -151,10 +159,13 @@
  41  {
  42         void __iomem    *pio = pin_to_controller(pin);
  43         unsigned        mask = pin_to_mask(pin);
  44 +       int bank = (pin - PIN_BASE) / 32;
  45
  46         if (!pio)
  47                 return -EINVAL;
  48
  49 +       pio_gpio_pin[bank] |= mask;
  50 +
  51         __raw_writel(mask, pio + PIO_IDR);
  52         __raw_writel(mask, pio + PIO_PUDR);
  53         __raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
  54 @@ -262,6 +273,18 @@
  55  }
  56  EXPORT_SYMBOL(at91_get_gpio_value);
  57
  58 +int at91_is_pin_gpio(unsigned pin)
  59 +{
  60 +       void __iomem  *pio = pin_to_controller(pin);
  61 +       unsigned  mask = pin_to_mask(pin);
  62 +       int     bank = (pin - PIN_BASE) / 32;
  63 +
  64 +       if (!pio)
  65 +               return -EINVAL;
  66 +       return (pio_gpio_pin[bank] & mask) != 0;
  67 +}
  68 +EXPORT_SYMBOL(at91_is_pin_gpio);
  69 +
  70  /*--------------------------------------------------------------------------*/
  71
  72  #ifdef CONFIG_PM
  73 diff -urN linux-2.6.22.1.old/drivers/char/Kconfig linux-2.6.22.1/drivers/char/Kconfig
  74 --- linux-2.6.22.1.old/drivers/char/Kconfig     2007-07-29 06:46:13.000000000 +0200
  75 +++ linux-2.6.22.1/drivers/char/Kconfig 2007-07-29 07:05:30.000000000 +0200
  76 @@ -1099,5 +1099,12 @@
  77           The SPI driver gives user mode access to this serial
  78           bus on the AT91RM9200 processor.
  79
  80 +config AT91_VLIO
  81 +       tristate "Versalink LED and GPIO interface"
  82 +       depends on ARCH_AT91RM9200 && MACH_VLINK
  83 +       default n
  84 +       help
  85 +         Provides a handler GPIO's in userspace
  86 +
  87  endmenu
  88
  89 diff -urN linux-2.6.22.1.old/drivers/char/Makefile linux-2.6.22.1/drivers/char/Makefile
  90 --- linux-2.6.22.1.old/drivers/char/Makefile    2007-07-29 06:46:13.000000000 +0200
  91 +++ linux-2.6.22.1/drivers/char/Makefile        2007-07-29 07:06:06.000000000 +0200
  92 @@ -95,6 +95,7 @@
  93  obj-$(CONFIG_TELCLOCK)         += tlclk.o
  94  obj-$(CONFIG_AT91_SPI)         += at91_spi.o
  95  obj-$(CONFIG_AT91_SPIDEV)      += at91_spidev.o
  96 +obj-$(CONFIG_AT91_VLIO)                += vlink_giu.o
  97
  98  obj-$(CONFIG_WATCHDOG)         += watchdog/
  99  obj-$(CONFIG_MWAVE)            += mwave/
 100 diff -urN linux-2.6.22.1.old/drivers/char/vlink_giu.c linux-2.6.22.1/drivers/char/vlink_giu.c
 101 --- linux-2.6.22.1.old/drivers/char/vlink_giu.c 1970-01-01 01:00:00.000000000 +0100
 102 +++ linux-2.6.22.1/drivers/char/vlink_giu.c     2007-07-29 07:06:33.000000000 +0200
 103 @@ -0,0 +1,256 @@
 104 +/*
 105 + *  Driver for FDL Versalink GPIO
 106 + *
 107 + *  Copyright (C) 2005 Guthrie Consulting
 108 + *     Author: Hamish Guthrie <hamish@prodigi.ch>
 109 + *
 110 + *  This program is free software; you can redistribute it and/or modify
 111 + *  it under the terms of the GNU General Public License as published by
 112 + *  the Free Software Foundation; either version 2 of the License, or
 113 + *  (at your option) any later version.
 114 + *
 115 + *  This program is distributed in the hope that it will be useful,
 116 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 117 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 118 + *  GNU General Public License for more details.
 119 + *
 120 + *  You should have received a copy of the GNU General Public License
 121 + *  along with this program; if not, write to the Free Software
 122 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 123 + */
 124 +
 125 +#include <linux/module.h>
 126 +#include <linux/moduleparam.h>
 127 +#include <linux/init.h>
 128 +#include <linux/platform_device.h>
 129 +
 130 +#include <linux/kernel.h>
 131 +#include <linux/slab.h>
 132 +#include <linux/fs.h>
 133 +#include <linux/errno.h>
 134 +#include <linux/init.h>
 135 +#include <linux/types.h>
 136 +#include <linux/proc_fs.h>
 137 +#include <linux/fcntl.h>
 138 +#include <linux/seq_file.h>
 139 +#include <linux/cdev.h>
 140 +#include <asm/arch/gpio.h>
 141 +#include <asm/uaccess.h>
 142 +
 143 +static int major;      /* default is dynamic major device number */
 144 +module_param(major, int, 0);
 145 +MODULE_PARM_DESC(major, "Major device number");
 146 +
 147 +#define VIO_NR_DEVS 96
 148 +
 149 +struct vio_dev {
 150 +       struct cdev cdev;
 151 +};
 152 +
 153 +struct vio_dev *vio_devices;
 154 +static struct class *vio_class;
 155 +
 156 +static ssize_t gpio_read(struct file *file, char __user *buf, size_t len,
 157 +                         loff_t *ppos)
 158 +{
 159 +       unsigned int pin;
 160 +       int retval;
 161 +       char value = '0';
 162 +
 163 +       pin = iminor(file->f_dentry->d_inode);
 164 +
 165 +       retval = at91_get_gpio_value(PIN_BASE + pin);
 166 +       if (retval < 0)
 167 +               return -EFAULT;
 168 +
 169 +       value = retval + 0x30;
 170 +       if (put_user(value, buf))
 171 +               return -EFAULT;
 172 +
 173 +       return 1;
 174 +}
 175 +
 176 +static ssize_t gpio_write(struct file *file, const char __user *data,
 177 +                          size_t len, loff_t *ppos)
 178 +{
 179 +       unsigned int pin;
 180 +       size_t i;
 181 +       char c;
 182 +       int retval = 0;
 183 +
 184 +       pin = iminor(file->f_dentry->d_inode);
 185 +
 186 +       for (i = 0; i < len; i++) {
 187 +               if (get_user(c, data + i))
 188 +                       return -EFAULT;
 189 +
 190 +               switch (c) {
 191 +               case '0':
 192 +               case '1':
 193 +                       retval = at91_set_gpio_value(PIN_BASE + pin, (int)c - 0x30);
 194 +                       if (retval < 0)
 195 +                               return -EFAULT;
 196 +                       break;
 197 +               default:
 198 +                       break;
 199 +               }
 200 +
 201 +               if (retval < 0)
 202 +                       break;
 203 +       }
 204 +
 205 +       return i;
 206 +}
 207 +
 208 +static int gpio_open(struct inode *inode, struct file *file)
 209 +{
 210 +       return nonseekable_open(inode, file);
 211 +}
 212 +
 213 +static int gpio_release(struct inode *inode, struct file *file)
 214 +{
 215 +       return 0;
 216 +}
 217 +
 218 +static struct file_operations vio_fops = {
 219 +       .owner          = THIS_MODULE,
 220 +       .read           = gpio_read,
 221 +       .write          = gpio_write,
 222 +       .open           = gpio_open,
 223 +       .release        = gpio_release,
 224 +};
 225 +
 226 +static void vio_setup_cdev(struct vio_dev *dev, int index)
 227 +{
 228 +       int err, devno = MKDEV(major, index);
 229 +
 230 +       cdev_init(&dev->cdev, &vio_fops);
 231 +       dev->cdev.owner = THIS_MODULE;
 232 +       dev->cdev.ops = &vio_fops;
 233 +       err = cdev_add (&dev->cdev, devno, 1);
 234 +       if (err)
 235 +               printk(KERN_NOTICE "vio: Error %d adding vio%d", err, index);
 236 +}
 237 +
 238 +static int vio_remove(struct platform_device *dev)
 239 +{
 240 +       int i;
 241 +       dev_t devno = MKDEV(major, 0);
 242 +
 243 +       if (vio_devices) {
 244 +               for(i=0; i<VIO_NR_DEVS; i++) {
 245 +                       int iodev = at91_is_pin_gpio(PIN_BASE + i);
 246 +                       if (iodev) {
 247 +                               cdev_del(&vio_devices[i].cdev);
 248 +                               class_device_destroy(vio_class, MKDEV(major, i));
 249 +                       }
 250 +               }
 251 +               kfree(vio_devices);
 252 +       }
 253 +
 254 +       class_destroy(vio_class);
 255 +       unregister_chrdev_region(devno, VIO_NR_DEVS);
 256 +
 257 +       platform_set_drvdata(dev, NULL);
 258 +
 259 +       return 0;
 260 +}
 261 +
 262 +static int vio_probe(struct platform_device *dev)
 263 +{
 264 +       int retval, i, j;
 265 +       dev_t vdev = 0;
 266 +
 267 +       if (major) {
 268 +               vdev = MKDEV(major, 0);
 269 +               retval = register_chrdev_region(vdev, VIO_NR_DEVS, "vio");
 270 +       } else {
 271 +               retval = alloc_chrdev_region(&vdev, 0, VIO_NR_DEVS, "vio");
 272 +               major = MAJOR(vdev);
 273 +       }
 274 +       if (retval < 0) {
 275 +               printk(KERN_WARNING "vio: can't get major %d\n", major);
 276 +               return retval;
 277 +       }
 278 +
 279 +       if (major == 0) {
 280 +               major = retval;
 281 +               printk(KERN_INFO "vio: major number %d\n", major);
 282 +       }
 283 +
 284 +       vio_class = class_create(THIS_MODULE, "vio");
 285 +
 286 +       if (IS_ERR(vio_class)) {
 287 +               printk(KERN_ERR "vio: Error creating vio class\n");
 288 +               vio_remove(dev);
 289 +               return PTR_ERR(vio_class);
 290 +       }
 291 +
 292 +       vio_devices = kmalloc(VIO_NR_DEVS * sizeof(struct vio_dev), GFP_KERNEL);
 293 +       if (!vio_devices) {
 294 +               retval = -ENOMEM;
 295 +               goto fail;
 296 +       }
 297 +       memset(vio_devices, 0, VIO_NR_DEVS * sizeof(struct vio_dev));
 298 +
 299 +       for (i=0; i<VIO_NR_DEVS/32; i++)
 300 +               for(j=0; j<32; j++) {
 301 +                       int iodev = at91_is_pin_gpio(PIN_BASE + i*32 + j);
 302 +                       if (iodev) {
 303 +                               vio_setup_cdev(&vio_devices[i*32 + j], i*32 + j);
 304 +                               class_device_create(vio_class, NULL, MKDEV(major, i*32 + j), NULL,
 305 +                                       "vio%c%d", i + 'A', j);
 306 +                       }
 307 +               }
 308 +
 309 +       platform_set_drvdata(dev, vio_devices);
 310 +
 311 +       return 0;
 312 +
 313 +fail:
 314 +       vio_remove(dev);
 315 +       return retval;
 316 +}
 317 +
 318 +static struct platform_device *vio_platform_device;
 319 +
 320 +static struct platform_driver vio_driver = {
 321 +       .probe          = vio_probe,
 322 +       .remove         = vio_remove,
 323 +       .driver         = {
 324 +               .name   = "vio",
 325 +               .owner  = THIS_MODULE,
 326 +       },
 327 +};
 328 +
 329 +static int __init vio_init(void)
 330 +{
 331 +       int retval;
 332 +
 333 +       vio_platform_device = platform_device_register_simple("vio", -1, NULL, 0);
 334 +       if (IS_ERR(vio_platform_device)) {
 335 +               printk(KERN_WARNING "vio: device registration failed\n");
 336 +               return PTR_ERR(vio_platform_device);
 337 +       }
 338 +
 339 +       retval = platform_driver_register(&vio_driver);
 340 +       if (retval < 0) {
 341 +               printk(KERN_WARNING "vio: driver registration failed\n");
 342 +               platform_device_unregister(vio_platform_device);
 343 +       }
 344 +
 345 +       return retval;
 346 +}
 347 +
 348 +static void __exit vio_exit(void)
 349 +{
 350 +       platform_driver_unregister(&vio_driver);
 351 +       platform_device_unregister(vio_platform_device);
 352 +}
 353 +
 354 +module_init(vio_init);
 355 +module_exit(vio_exit);
 356 +
 357 +MODULE_AUTHOR("Hamish Guthrie <hamish@prodigi.ch>");
 358 +MODULE_DESCRIPTION("FDL Versalink GPIO Driver");
 359 +MODULE_LICENSE("GPL");