target/linux/at91/patches-2.6.21/003-gpio-driver.patch

   1 Index: linux-2.6.21.7/arch/arm/mach-at91/gpio.c
   2 ===================================================================
   3 --- linux-2.6.21.7.orig/arch/arm/mach-at91/gpio.c
   4 +++ linux-2.6.21.7/arch/arm/mach-at91/gpio.c
   5 @@ -27,6 +27,7 @@
   6
   7  static struct at91_gpio_bank *gpio;
   8  static int gpio_banks;
   9 +static u32 pio_gpio_pin[4] = { 0, 0, 0, 0 };
  10
  11
  12  static inline void __iomem *pin_to_controller(unsigned pin)
  13 @@ -71,9 +72,13 @@ int __init_or_module at91_set_GPIO_perip
  14  {
  15         void __iomem    *pio = pin_to_controller(pin);
  16         unsigned        mask = pin_to_mask(pin);
  17 +       int bank = (pin - PIN_BASE) / 32;
  18
  19         if (!pio)
  20                 return -EINVAL;
  21 +
  22 +       pio_gpio_pin[bank] |= mask;
  23 +
  24         __raw_writel(mask, pio + PIO_IDR);
  25         __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
  26         __raw_writel(mask, pio + PIO_PER);
  27 @@ -130,10 +135,13 @@ int __init_or_module at91_set_gpio_input
  28  {
  29         void __iomem    *pio = pin_to_controller(pin);
  30         unsigned        mask = pin_to_mask(pin);
  31 +       int bank = (pin - PIN_BASE) / 32;
  32
  33         if (!pio)
  34                 return -EINVAL;
  35
  36 +       pio_gpio_pin[bank] |= mask;
  37 +
  38         __raw_writel(mask, pio + PIO_IDR);
  39         __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
  40         __raw_writel(mask, pio + PIO_ODR);
  41 @@ -151,10 +159,13 @@ int __init_or_module at91_set_gpio_outpu
  42  {
  43         void __iomem    *pio = pin_to_controller(pin);
  44         unsigned        mask = pin_to_mask(pin);
  45 +       int bank = (pin - PIN_BASE) / 32;
  46
  47         if (!pio)
  48                 return -EINVAL;
  49
  50 +       pio_gpio_pin[bank] |= mask;
  51 +
  52         __raw_writel(mask, pio + PIO_IDR);
  53         __raw_writel(mask, pio + PIO_PUDR);
  54         __raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
  55 @@ -262,6 +273,18 @@ int at91_get_gpio_value(unsigned pin)
  56  }
  57  EXPORT_SYMBOL(at91_get_gpio_value);
  58
  59 +int at91_is_pin_gpio(unsigned pin)
  60 +{
  61 +  void __iomem  *pio = pin_to_controller(pin);
  62 +  unsigned  mask = pin_to_mask(pin);
  63 +  int     bank = (pin - PIN_BASE) / 32;
  64 +
  65 +  if (!pio)
  66 +    return -EINVAL;
  67 +  return (pio_gpio_pin[bank] & mask) != 0;
  68 +}
  69 +EXPORT_SYMBOL(at91_is_pin_gpio);
  70 +
  71  /*--------------------------------------------------------------------------*/
  72
  73  #ifdef CONFIG_PM
  74 Index: linux-2.6.21.7/drivers/char/Kconfig
  75 ===================================================================
  76 --- linux-2.6.21.7.orig/drivers/char/Kconfig
  77 +++ linux-2.6.21.7/drivers/char/Kconfig
  78 @@ -1087,5 +1087,12 @@ config AT91_SPIDEV
  79           The SPI driver gives user mode access to this serial
  80           bus on the AT91RM9200 processor.
  81
  82 +config AT91_VLIO
  83 +  tristate "Versalink LED and GPIO interface"
  84 +  depends on ARCH_AT91RM9200 && MACH_VLINK
  85 +  default n
  86 +  help
  87 +    Provides a handler GPIO's in userspace
  88 +
  89  endmenu
  90
  91 Index: linux-2.6.21.7/drivers/char/Makefile
  92 ===================================================================
  93 --- linux-2.6.21.7.orig/drivers/char/Makefile
  94 +++ linux-2.6.21.7/drivers/char/Makefile
  95 @@ -95,6 +95,7 @@ obj-$(CONFIG_TANBAC_TB0219)   += tb0219.o
  96  obj-$(CONFIG_TELCLOCK)         += tlclk.o
  97  obj-$(CONFIG_AT91_SPI)         += at91_spi.o
  98  obj-$(CONFIG_AT91_SPIDEV)      += at91_spidev.o
  99 +obj-$(CONFIG_AT91_VLIO)  += vlink_giu.o
 100
 101  obj-$(CONFIG_WATCHDOG)         += watchdog/
 102  obj-$(CONFIG_MWAVE)            += mwave/
 103 Index: linux-2.6.21.7/drivers/char/vlink_giu.c
 104 ===================================================================
 105 --- /dev/null
 106 +++ linux-2.6.21.7/drivers/char/vlink_giu.c
 107 @@ -0,0 +1,256 @@
 108 +/*
 109 + *  Driver for FDL Versalink GPIO
 110 + *
 111 + *  Copyright (C) 2005 Guthrie Consulting
 112 + *     Author: Hamish Guthrie <hamish@prodigi.ch>
 113 + *
 114 + *  This program is free software; you can redistribute it and/or modify
 115 + *  it under the terms of the GNU General Public License as published by
 116 + *  the Free Software Foundation; either version 2 of the License, or
 117 + *  (at your option) any later version.
 118 + *
 119 + *  This program is distributed in the hope that it will be useful,
 120 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 121 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 122 + *  GNU General Public License for more details.
 123 + *
 124 + *  You should have received a copy of the GNU General Public License
 125 + *  along with this program; if not, write to the Free Software
 126 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 127 + */
 128 +
 129 +#include <linux/module.h>
 130 +#include <linux/moduleparam.h>
 131 +#include <linux/init.h>
 132 +#include <linux/platform_device.h>
 133 +
 134 +#include <linux/kernel.h>
 135 +#include <linux/slab.h>
 136 +#include <linux/fs.h>
 137 +#include <linux/errno.h>
 138 +#include <linux/init.h>
 139 +#include <linux/types.h>
 140 +#include <linux/proc_fs.h>
 141 +#include <linux/fcntl.h>
 142 +#include <linux/seq_file.h>
 143 +#include <linux/cdev.h>
 144 +#include <asm/arch/gpio.h>
 145 +#include <asm/uaccess.h>
 146 +
 147 +static int major;      /* default is dynamic major device number */
 148 +module_param(major, int, 0);
 149 +MODULE_PARM_DESC(major, "Major device number");
 150 +
 151 +#define VIO_NR_DEVS 96
 152 +
 153 +struct vio_dev {
 154 +       struct cdev cdev;
 155 +};
 156 +
 157 +struct vio_dev *vio_devices;
 158 +static struct class *vio_class;
 159 +
 160 +static ssize_t gpio_read(struct file *file, char __user *buf, size_t len,
 161 +                         loff_t *ppos)
 162 +{
 163 +       unsigned int pin;
 164 +       int retval;
 165 +       char value = '0';
 166 +
 167 +       pin = iminor(file->f_dentry->d_inode);
 168 +
 169 +       retval = at91_get_gpio_value(PIN_BASE + pin);
 170 +       if (retval < 0)
 171 +               return -EFAULT;
 172 +
 173 +       value = retval + 0x30;
 174 +       if (put_user(value, buf))
 175 +               return -EFAULT;
 176 +
 177 +       return 1;
 178 +}
 179 +
 180 +static ssize_t gpio_write(struct file *file, const char __user *data,
 181 +                          size_t len, loff_t *ppos)
 182 +{
 183 +       unsigned int pin;
 184 +       size_t i;
 185 +       char c;
 186 +       int retval = 0;
 187 +
 188 +       pin = iminor(file->f_dentry->d_inode);
 189 +
 190 +       for (i = 0; i < len; i++) {
 191 +               if (get_user(c, data + i))
 192 +                       return -EFAULT;
 193 +
 194 +               switch (c) {
 195 +               case '0':
 196 +               case '1':
 197 +                       retval = at91_set_gpio_value(PIN_BASE + pin, (int)c - 0x30);
 198 +                       if (retval < 0)
 199 +                               return -EFAULT;
 200 +                       break;
 201 +               default:
 202 +                       break;
 203 +               }
 204 +
 205 +               if (retval < 0)
 206 +                       break;
 207 +       }
 208 +
 209 +       return i;
 210 +}
 211 +
 212 +static int gpio_open(struct inode *inode, struct file *file)
 213 +{
 214 +       return nonseekable_open(inode, file);
 215 +}
 216 +
 217 +static int gpio_release(struct inode *inode, struct file *file)
 218 +{
 219 +       return 0;
 220 +}
 221 +
 222 +static struct file_operations vio_fops = {
 223 +       .owner          = THIS_MODULE,
 224 +       .read           = gpio_read,
 225 +       .write          = gpio_write,
 226 +       .open           = gpio_open,
 227 +       .release        = gpio_release,
 228 +};
 229 +
 230 +static void vio_setup_cdev(struct vio_dev *dev, int index)
 231 +{
 232 +       int err, devno = MKDEV(major, index);
 233 +
 234 +       cdev_init(&dev->cdev, &vio_fops);
 235 +       dev->cdev.owner = THIS_MODULE;
 236 +       dev->cdev.ops = &vio_fops;
 237 +       err = cdev_add (&dev->cdev, devno, 1);
 238 +       if (err)
 239 +               printk(KERN_NOTICE "vio: Error %d adding vio%d", err, index);
 240 +}
 241 +
 242 +static int vio_remove(struct platform_device *dev)
 243 +{
 244 +       int i;
 245 +       dev_t devno = MKDEV(major, 0);
 246 +
 247 +       if (vio_devices) {
 248 +               for(i=0; i<VIO_NR_DEVS; i++) {
 249 +                       int iodev = at91_is_pin_gpio(PIN_BASE + i);
 250 +                       if (iodev) {
 251 +                               cdev_del(&vio_devices[i].cdev);
 252 +                               class_device_destroy(vio_class, MKDEV(major, i));
 253 +                       }
 254 +               }
 255 +               kfree(vio_devices);
 256 +       }
 257 +
 258 +       class_destroy(vio_class);
 259 +       unregister_chrdev_region(devno, VIO_NR_DEVS);
 260 +
 261 +       platform_set_drvdata(dev, NULL);
 262 +
 263 +       return 0;
 264 +}
 265 +
 266 +static int vio_probe(struct platform_device *dev)
 267 +{
 268 +       int retval, i, j;
 269 +       dev_t vdev = 0;
 270 +
 271 +       if (major) {
 272 +               vdev = MKDEV(major, 0);
 273 +               retval = register_chrdev_region(vdev, VIO_NR_DEVS, "vio");
 274 +       } else {
 275 +               retval = alloc_chrdev_region(&vdev, 0, VIO_NR_DEVS, "vio");
 276 +               major = MAJOR(vdev);
 277 +       }
 278 +       if (retval < 0) {
 279 +               printk(KERN_WARNING "vio: can't get major %d\n", major);
 280 +               return retval;
 281 +       }
 282 +
 283 +       if (major == 0) {
 284 +               major = retval;
 285 +               printk(KERN_INFO "vio: major number %d\n", major);
 286 +       }
 287 +
 288 +       vio_class = class_create(THIS_MODULE, "vio");
 289 +
 290 +       if (IS_ERR(vio_class)) {
 291 +               printk(KERN_ERR "vio: Error creating vio class\n");
 292 +               vio_remove(dev);
 293 +               return PTR_ERR(vio_class);
 294 +       }
 295 +
 296 +       vio_devices = kmalloc(VIO_NR_DEVS * sizeof(struct vio_dev), GFP_KERNEL);
 297 +       if (!vio_devices) {
 298 +               retval = -ENOMEM;
 299 +               goto fail;
 300 +       }
 301 +       memset(vio_devices, 0, VIO_NR_DEVS * sizeof(struct vio_dev));
 302 +
 303 +       for (i=0; i<VIO_NR_DEVS/32; i++)
 304 +               for(j=0; j<32; j++) {
 305 +                       int iodev = at91_is_pin_gpio(PIN_BASE + i*32 + j);
 306 +                       if (iodev) {
 307 +                               vio_setup_cdev(&vio_devices[i*32 + j], i*32 + j);
 308 +                               class_device_create(vio_class, NULL, MKDEV(major, i*32 + j), NULL,
 309 +                                       "vio%c%d", i + 'A', j);
 310 +                       }
 311 +               }
 312 +
 313 +       platform_set_drvdata(dev, vio_devices);
 314 +
 315 +       return 0;
 316 +
 317 +fail:
 318 +       vio_remove(dev);
 319 +       return retval;
 320 +}
 321 +
 322 +static struct platform_device *vio_platform_device;
 323 +
 324 +static struct platform_driver vio_driver = {
 325 +       .probe          = vio_probe,
 326 +       .remove         = vio_remove,
 327 +       .driver         = {
 328 +               .name   = "vio",
 329 +               .owner  = THIS_MODULE,
 330 +       },
 331 +};
 332 +
 333 +static int __init vio_init(void)
 334 +{
 335 +       int retval;
 336 +
 337 +       vio_platform_device = platform_device_register_simple("vio", -1, NULL, 0);
 338 +       if (IS_ERR(vio_platform_device)) {
 339 +               printk(KERN_WARNING "vio: device registration failed\n");
 340 +               return PTR_ERR(vio_platform_device);
 341 +       }
 342 +
 343 +       retval = platform_driver_register(&vio_driver);
 344 +       if (retval < 0) {
 345 +               printk(KERN_WARNING "vio: driver registration failed\n");
 346 +               platform_device_unregister(vio_platform_device);
 347 +       }
 348 +
 349 +       return retval;
 350 +}
 351 +
 352 +static void __exit vio_exit(void)
 353 +{
 354 +       platform_driver_unregister(&vio_driver);
 355 +       platform_device_unregister(vio_platform_device);
 356 +}
 357 +
 358 +module_init(vio_init);
 359 +module_exit(vio_exit);
 360 +
 361 +MODULE_AUTHOR("Hamish Guthrie <hamish@prodigi.ch>");
 362 +MODULE_DESCRIPTION("FDL Versalink GPIO Driver");
 363 +MODULE_LICENSE("GPL");