target/linux/adm5120/patches-2.6.25/902-usb_use_debugfs_instead_of_sysfs.patch

   1 --- a/drivers/usb/host/adm5120.h
   2 +++ b/drivers/usb/host/adm5120.h
   3 @@ -431,6 +431,13 @@
   4  #define        OHCI_QUIRK_BE_MMIO      0x10                    /* BE registers */
   5  #define        OHCI_QUIRK_ZFMICRO      0x20                    /* Compaq ZFMicro chipset*/
   6         // there are also chip quirks/bugs in init logic
   7 +
   8 +#ifdef DEBUG
   9 +       struct dentry           *debug_dir;
  10 +       struct dentry           *debug_async;
  11 +       struct dentry           *debug_periodic;
  12 +       struct dentry           *debug_registers;
  13 +#endif
  14  };
  15
  16  /* convert between an hcd pointer and the corresponding ahcd_hcd */
  17 --- a/drivers/usb/host/adm5120-hcd.c
  18 +++ b/drivers/usb/host/adm5120-hcd.c
  19 @@ -35,6 +35,7 @@
  20  #include <linux/dma-mapping.h>
  21  #include <linux/dmapool.h>
  22  #include <linux/reboot.h>
  23 +#include <linux/debugfs.h>
  24
  25  #include <asm/io.h>
  26  #include <asm/irq.h>
  27 @@ -804,6 +805,14 @@
  28         pr_info("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
  29                 sizeof (struct ed), sizeof (struct td));
  30
  31 +#ifdef DEBUG
  32 +       admhc_debug_root = debugfs_create_dir("admhc", NULL);
  33 +       if (!admhc_debug_root) {
  34 +               ret = -ENOENT;
  35 +               goto error_debug;
  36 +       }
  37 +#endif
  38 +
  39  #ifdef PLATFORM_DRIVER
  40         ret = platform_driver_register(&PLATFORM_DRIVER);
  41         if (ret < 0)
  42 @@ -816,6 +825,12 @@
  43         platform_driver_unregister(&PLATFORM_DRIVER);
  44  error_platform:
  45  #endif
  46 +
  47 +#ifdef DEBUG
  48 +       debugfs_remove(admhc_debug_root);
  49 +       admhc_debug_root = NULL;
  50 +error_debug:
  51 +#endif
  52         return ret;
  53  }
  54  module_init(admhc_hcd_mod_init);
  55 @@ -823,6 +838,9 @@
  56  static void __exit admhc_hcd_mod_exit(void)
  57  {
  58         platform_driver_unregister(&PLATFORM_DRIVER);
  59 +#ifdef DEBUG
  60 +       debugfs_remove(admhc_debug_root);
  61 +#endif
  62  }
  63  module_exit(admhc_hcd_mod_exit);
  64
  65 --- a/drivers/usb/host/adm5120-dbg.c
  66 +++ b/drivers/usb/host/adm5120-dbg.c
  67 @@ -390,6 +390,42 @@
  68
  69  #else
  70
  71 +static int debug_async_open(struct inode *, struct file *);
  72 +static int debug_periodic_open(struct inode *, struct file *);
  73 +static int debug_registers_open(struct inode *, struct file *);
  74 +static int debug_async_open(struct inode *, struct file *);
  75 +static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
  76 +static int debug_close(struct inode *, struct file *);
  77 +
  78 +static const struct file_operations debug_async_fops = {
  79 +       .owner          = THIS_MODULE,
  80 +       .open           = debug_async_open,
  81 +       .read           = debug_output,
  82 +       .release        = debug_close,
  83 +};
  84 +static const struct file_operations debug_periodic_fops = {
  85 +       .owner          = THIS_MODULE,
  86 +       .open           = debug_periodic_open,
  87 +       .read           = debug_output,
  88 +       .release        = debug_close,
  89 +};
  90 +static const struct file_operations debug_registers_fops = {
  91 +       .owner          = THIS_MODULE,
  92 +       .open           = debug_registers_open,
  93 +       .read           = debug_output,
  94 +       .release        = debug_close,
  95 +};
  96 +
  97 +static struct dentry *admhc_debug_root;
  98 +
  99 +struct debug_buffer {
 100 +       ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
 101 +       struct device *dev;
 102 +       struct mutex mutex;     /* protect filling of buffer */
 103 +       size_t count;           /* number of characters filled into buffer */
 104 +       char *page;
 105 +};
 106 +
 107  static ssize_t
 108  show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 109  {
 110 @@ -455,8 +491,7 @@
 111         return count - size;
 112  }
 113
 114 -static ssize_t
 115 -show_async(struct device *dev, struct device_attribute *attr, char *buf)
 116 +static ssize_t fill_async_buffer(struct debug_buffer *buf)
 117  {
 118         struct usb_bus          *bus;
 119         struct usb_hcd          *hcd;
 120 @@ -464,24 +499,22 @@
 121         size_t                  temp;
 122         unsigned long           flags;
 123
 124 -       bus = dev_get_drvdata(dev);
 125 +       bus = dev_get_drvdata(buf->dev);
 126         hcd = bus_to_hcd(bus);
 127         ahcd = hcd_to_admhcd(hcd);
 128
 129         /* display control and bulk lists together, for simplicity */
 130         spin_lock_irqsave(&ahcd->lock, flags);
 131 -       temp = show_list(ahcd, buf, PAGE_SIZE, ahcd->ed_head);
 132 +       temp = show_list(ahcd, buf->page, buf->count, ahcd->ed_head);
 133         spin_unlock_irqrestore(&ahcd->lock, flags);
 134
 135         return temp;
 136  }
 137 -static DEVICE_ATTR(async, S_IRUGO, show_async, NULL);
 138
 139
 140  #define DBG_SCHED_LIMIT 64
 141
 142 -static ssize_t
 143 -show_periodic(struct device *dev, struct device_attribute *attr, char *buf)
 144 +static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 145  {
 146         struct usb_bus          *bus;
 147         struct usb_hcd          *hcd;
 148 @@ -496,10 +529,10 @@
 149                 return 0;
 150         seen_count = 0;
 151
 152 -       bus = dev_get_drvdata(dev);
 153 +       bus = dev_get_drvdata(buf->dev);
 154         hcd = bus_to_hcd(bus);
 155         ahcd = hcd_to_admhcd(hcd);
 156 -       next = buf;
 157 +       next = buf->page;
 158         size = PAGE_SIZE;
 159
 160         temp = scnprintf(next, size, "size = %d\n", NUM_INTS);
 161 @@ -574,13 +607,11 @@
 162
 163         return PAGE_SIZE - size;
 164  }
 165 -static DEVICE_ATTR(periodic, S_IRUGO, show_periodic, NULL);
 166
 167
 168  #undef DBG_SCHED_LIMIT
 169
 170 -static ssize_t
 171 -show_registers(struct device *dev, struct device_attribute *attr, char *buf)
 172 +static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 173  {
 174         struct usb_bus          *bus;
 175         struct usb_hcd          *hcd;
 176 @@ -591,11 +622,11 @@
 177         char                    *next;
 178         u32                     rdata;
 179
 180 -       bus = dev_get_drvdata(dev);
 181 +       bus = dev_get_drvdata(buf->dev);
 182         hcd = bus_to_hcd(bus);
 183         ahcd = hcd_to_admhcd(hcd);
 184         regs = ahcd->regs;
 185 -       next = buf;
 186 +       next = buf->page;
 187         size = PAGE_SIZE;
 188
 189         spin_lock_irqsave(&ahcd->lock, flags);
 190 @@ -656,27 +687,154 @@
 191         spin_unlock_irqrestore(&ahcd->lock, flags);
 192         return PAGE_SIZE - size;
 193  }
 194 -static DEVICE_ATTR(registers, S_IRUGO, show_registers, NULL);
 195
 196
 197 -static inline void create_debug_files (struct admhcd *ahcd)
 198 +static struct debug_buffer *alloc_buffer(struct device *dev,
 199 +                               ssize_t (*fill_func)(struct debug_buffer *))
 200  {
 201 -       struct device *dev = admhcd_to_hcd(ahcd)->self.dev;
 202 -       int retval;
 203 +       struct debug_buffer *buf;
 204
 205 -       retval = device_create_file(dev, &dev_attr_async);
 206 -       retval = device_create_file(dev, &dev_attr_periodic);
 207 -       retval = device_create_file(dev, &dev_attr_registers);
 208 -       admhc_dbg(ahcd, "created debug files\n");
 209 +       buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 210 +
 211 +       if (buf) {
 212 +               buf->dev = dev;
 213 +               buf->fill_func = fill_func;
 214 +               mutex_init(&buf->mutex);
 215 +       }
 216 +
 217 +       return buf;
 218 +}
 219 +
 220 +static int fill_buffer(struct debug_buffer *buf)
 221 +{
 222 +       int ret = 0;
 223 +
 224 +       if (!buf->page)
 225 +               buf->page = (char *)get_zeroed_page(GFP_KERNEL);
 226 +
 227 +       if (!buf->page) {
 228 +               ret = -ENOMEM;
 229 +               goto out;
 230 +       }
 231 +
 232 +       ret = buf->fill_func(buf);
 233 +
 234 +       if (ret >= 0) {
 235 +               buf->count = ret;
 236 +               ret = 0;
 237 +       }
 238 +
 239 +out:
 240 +       return ret;
 241 +}
 242 +
 243 +static ssize_t debug_output(struct file *file, char __user *user_buf,
 244 +                       size_t len, loff_t *offset)
 245 +{
 246 +       struct debug_buffer *buf = file->private_data;
 247 +       int ret = 0;
 248 +
 249 +       mutex_lock(&buf->mutex);
 250 +       if (buf->count == 0) {
 251 +               ret = fill_buffer(buf);
 252 +               if (ret != 0) {
 253 +                       mutex_unlock(&buf->mutex);
 254 +                       goto out;
 255 +               }
 256 +       }
 257 +       mutex_unlock(&buf->mutex);
 258 +
 259 +       ret = simple_read_from_buffer(user_buf, len, offset,
 260 +                                       buf->page, buf->count);
 261 +
 262 +out:
 263 +       return ret;
 264 +}
 265 +
 266 +static int debug_close(struct inode *inode, struct file *file)
 267 +{
 268 +       struct debug_buffer *buf = file->private_data;
 269 +
 270 +       if (buf) {
 271 +               if (buf->page)
 272 +                       free_page((unsigned long)buf->page);
 273 +               kfree(buf);
 274 +       }
 275 +
 276 +       return 0;
 277  }
 278
 279 -static inline void remove_debug_files (struct admhcd *ahcd)
 280 +static int debug_async_open(struct inode *inode, struct file *file)
 281  {
 282 -       struct device *dev = admhcd_to_hcd(ahcd)->self.dev;
 283 +       file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
 284 +
 285 +       return file->private_data ? 0 : -ENOMEM;
 286 +}
 287 +
 288 +static int debug_periodic_open(struct inode *inode, struct file *file)
 289 +{
 290 +       file->private_data = alloc_buffer(inode->i_private,
 291 +                                               fill_periodic_buffer);
 292 +
 293 +       return file->private_data ? 0 : -ENOMEM;
 294 +}
 295
 296 -       device_remove_file(dev, &dev_attr_async);
 297 -       device_remove_file(dev, &dev_attr_periodic);
 298 -       device_remove_file(dev, &dev_attr_registers);
 299 +static int debug_registers_open(struct inode *inode, struct file *file)
 300 +{
 301 +       file->private_data = alloc_buffer(inode->i_private,
 302 +                                               fill_registers_buffer);
 303 +
 304 +       return file->private_data ? 0 : -ENOMEM;
 305 +}
 306 +
 307 +static inline void create_debug_files(struct admhcd *ahcd)
 308 +{
 309 +       struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
 310 +       struct device *dev = bus->dev;
 311 +
 312 +       ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
 313 +       if (!ahcd->debug_dir)
 314 +               goto dir_error;
 315 +
 316 +       ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
 317 +                                               ahcd->debug_dir, dev,
 318 +                                               &debug_async_fops);
 319 +       if (!ahcd->debug_async)
 320 +               goto async_error;
 321 +
 322 +       ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
 323 +                                               ahcd->debug_dir, dev,
 324 +                                               &debug_periodic_fops);
 325 +       if (!ahcd->debug_periodic)
 326 +               goto periodic_error;
 327 +
 328 +       ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
 329 +                                               ahcd->debug_dir, dev,
 330 +                                               &debug_registers_fops);
 331 +       if (!ahcd->debug_registers)
 332 +               goto registers_error;
 333 +
 334 +       admhc_dbg(ahcd, "created debug files\n");
 335 +       return;
 336 +
 337 +registers_error:
 338 +       debugfs_remove(ahcd->debug_periodic);
 339 +periodic_error:
 340 +       debugfs_remove(ahcd->debug_async);
 341 +async_error:
 342 +       debugfs_remove(ahcd->debug_dir);
 343 +dir_error:
 344 +       ahcd->debug_periodic = NULL;
 345 +       ahcd->debug_async = NULL;
 346 +       ahcd->debug_dir = NULL;
 347 +}
 348 +
 349 +static inline void remove_debug_files(struct admhcd *ahcd)
 350 +{
 351 +       debugfs_remove(ahcd->debug_registers);
 352 +       debugfs_remove(ahcd->debug_periodic);
 353 +       debugfs_remove(ahcd->debug_async);
 354 +       debugfs_remove(ahcd->debug_dir);
 355  }
 356
 357  #endif