drivers/usb/chipidea/debug.c

   1 #include <linux/kernel.h>
   2 #include <linux/device.h>
   3 #include <linux/types.h>
   4 #include <linux/spinlock.h>
   5 #include <linux/debugfs.h>
   6 #include <linux/seq_file.h>
   7 #include <linux/uaccess.h>
   8 #include <linux/usb/ch9.h>
   9 #include <linux/usb/gadget.h>
  10 #include <linux/usb/phy.h>
  11 #include <linux/usb/otg.h>
  12 #include <linux/usb/otg-fsm.h>
  13 #include <linux/usb/chipidea.h>
  14
  15 #include "ci.h"
  16 #include "udc.h"
  17 #include "bits.h"
  18 #include "otg.h"
  19
  20 /**
  21  * ci_device_show: prints information about device capabilities and status
  22  */
  23 static int ci_device_show(struct seq_file *s, void *data)
  24 {
  25         struct ci_hdrc *ci = s->private;
  26         struct usb_gadget *gadget = &ci->gadget;
  27
  28         seq_printf(s, "speed             = %d\n", gadget->speed);
  29         seq_printf(s, "max_speed         = %d\n", gadget->max_speed);
  30         seq_printf(s, "is_otg            = %d\n", gadget->is_otg);
  31         seq_printf(s, "is_a_peripheral   = %d\n", gadget->is_a_peripheral);
  32         seq_printf(s, "b_hnp_enable      = %d\n", gadget->b_hnp_enable);
  33         seq_printf(s, "a_hnp_support     = %d\n", gadget->a_hnp_support);
  34         seq_printf(s, "a_alt_hnp_support = %d\n", gadget->a_alt_hnp_support);
  35         seq_printf(s, "name              = %s\n",
  36                    (gadget->name ? gadget->name : ""));
  37
  38         if (!ci->driver)
  39                 return 0;
  40
  41         seq_printf(s, "gadget function   = %s\n",
  42                        (ci->driver->function ? ci->driver->function : ""));
  43         seq_printf(s, "gadget max speed  = %d\n", ci->driver->max_speed);
  44
  45         return 0;
  46 }
  47
  48 static int ci_device_open(struct inode *inode, struct file *file)
  49 {
  50         return single_open(file, ci_device_show, inode->i_private);
  51 }
  52
  53 static const struct file_operations ci_device_fops = {
  54         .open           = ci_device_open,
  55         .read           = seq_read,
  56         .llseek         = seq_lseek,
  57         .release        = single_release,
  58 };
  59
  60 /**
  61  * ci_port_test_show: reads port test mode
  62  */
  63 static int ci_port_test_show(struct seq_file *s, void *data)
  64 {
  65         struct ci_hdrc *ci = s->private;
  66         unsigned long flags;
  67         unsigned mode;
  68
  69         pm_runtime_get_sync(ci->dev);
  70         spin_lock_irqsave(&ci->lock, flags);
  71         mode = hw_port_test_get(ci);
  72         spin_unlock_irqrestore(&ci->lock, flags);
  73         pm_runtime_put_sync(ci->dev);
  74
  75         seq_printf(s, "mode = %u\n", mode);
  76
  77         return 0;
  78 }
  79
  80 /**
  81  * ci_port_test_write: writes port test mode
  82  */
  83 static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf,
  84                                   size_t count, loff_t *ppos)
  85 {
  86         struct seq_file *s = file->private_data;
  87         struct ci_hdrc *ci = s->private;
  88         unsigned long flags;
  89         unsigned mode;
  90         char buf[32];
  91         int ret;
  92
  93         count = min_t(size_t, sizeof(buf) - 1, count);
  94         if (copy_from_user(buf, ubuf, count))
  95                 return -EFAULT;
  96
  97         /* sscanf requires a zero terminated string */
  98         buf[count] = '\0';
  99
 100         if (sscanf(buf, "%u", &mode) != 1)
 101                 return -EINVAL;
 102
 103         if (mode > 255)
 104                 return -EBADRQC;
 105
 106         pm_runtime_get_sync(ci->dev);
 107         spin_lock_irqsave(&ci->lock, flags);
 108         ret = hw_port_test_set(ci, mode);
 109         spin_unlock_irqrestore(&ci->lock, flags);
 110         pm_runtime_put_sync(ci->dev);
 111
 112         return ret ? ret : count;
 113 }
 114
 115 static int ci_port_test_open(struct inode *inode, struct file *file)
 116 {
 117         return single_open(file, ci_port_test_show, inode->i_private);
 118 }
 119
 120 static const struct file_operations ci_port_test_fops = {
 121         .open           = ci_port_test_open,
 122         .write          = ci_port_test_write,
 123         .read           = seq_read,
 124         .llseek         = seq_lseek,
 125         .release        = single_release,
 126 };
 127
 128 /**
 129  * ci_qheads_show: DMA contents of all queue heads
 130  */
 131 static int ci_qheads_show(struct seq_file *s, void *data)
 132 {
 133         struct ci_hdrc *ci = s->private;
 134         unsigned long flags;
 135         unsigned i, j;
 136
 137         if (ci->role != CI_ROLE_GADGET) {
 138                 seq_printf(s, "not in gadget mode\n");
 139                 return 0;
 140         }
 141
 142         spin_lock_irqsave(&ci->lock, flags);
 143         for (i = 0; i < ci->hw_ep_max/2; i++) {
 144                 struct ci_hw_ep *hweprx = &ci->ci_hw_ep[i];
 145                 struct ci_hw_ep *hweptx =
 146                         &ci->ci_hw_ep[i + ci->hw_ep_max/2];
 147                 seq_printf(s, "EP=%02i: RX=%08X TX=%08X\n",
 148                            i, (u32)hweprx->qh.dma, (u32)hweptx->qh.dma);
 149                 for (j = 0; j < (sizeof(struct ci_hw_qh)/sizeof(u32)); j++)
 150                         seq_printf(s, " %04X:    %08X    %08X\n", j,
 151                                    *((u32 *)hweprx->qh.ptr + j),
 152                                    *((u32 *)hweptx->qh.ptr + j));
 153         }
 154         spin_unlock_irqrestore(&ci->lock, flags);
 155
 156         return 0;
 157 }
 158
 159 static int ci_qheads_open(struct inode *inode, struct file *file)
 160 {
 161         return single_open(file, ci_qheads_show, inode->i_private);
 162 }
 163
 164 static const struct file_operations ci_qheads_fops = {
 165         .open           = ci_qheads_open,
 166         .read           = seq_read,
 167         .llseek         = seq_lseek,
 168         .release        = single_release,
 169 };
 170
 171 /**
 172  * ci_requests_show: DMA contents of all requests currently queued (all endpts)
 173  */
 174 static int ci_requests_show(struct seq_file *s, void *data)
 175 {
 176         struct ci_hdrc *ci = s->private;
 177         unsigned long flags;
 178         struct ci_hw_req *req = NULL;
 179         struct td_node *node, *tmpnode;
 180         unsigned i, j, qsize = sizeof(struct ci_hw_td)/sizeof(u32);
 181
 182         if (ci->role != CI_ROLE_GADGET) {
 183                 seq_printf(s, "not in gadget mode\n");
 184                 return 0;
 185         }
 186
 187         spin_lock_irqsave(&ci->lock, flags);
 188         for (i = 0; i < ci->hw_ep_max; i++)
 189                 list_for_each_entry(req, &ci->ci_hw_ep[i].qh.queue, queue) {
 190                         list_for_each_entry_safe(node, tmpnode, &req->tds, td) {
 191                                 seq_printf(s, "EP=%02i: TD=%08X %s\n",
 192                                            i % (ci->hw_ep_max / 2),
 193                                            (u32)node->dma,
 194                                            ((i < ci->hw_ep_max/2) ?
 195                                            "RX" : "TX"));
 196
 197                                 for (j = 0; j < qsize; j++)
 198                                         seq_printf(s, " %04X:    %08X\n", j,
 199                                                    *((u32 *)node->ptr + j));
 200                         }
 201                 }
 202         spin_unlock_irqrestore(&ci->lock, flags);
 203
 204         return 0;
 205 }
 206
 207 static int ci_requests_open(struct inode *inode, struct file *file)
 208 {
 209         return single_open(file, ci_requests_show, inode->i_private);
 210 }
 211
 212 static const struct file_operations ci_requests_fops = {
 213         .open           = ci_requests_open,
 214         .read           = seq_read,
 215         .llseek         = seq_lseek,
 216         .release        = single_release,
 217 };
 218
 219 static int ci_otg_show(struct seq_file *s, void *unused)
 220 {
 221         struct ci_hdrc *ci = s->private;
 222         struct otg_fsm *fsm;
 223
 224         if (!ci || !ci_otg_is_fsm_mode(ci))
 225                 return 0;
 226
 227         fsm = &ci->fsm;
 228
 229         /* ------ State ----- */
 230         seq_printf(s, "OTG state: %s\n\n",
 231                         usb_otg_state_string(ci->otg.state));
 232
 233         /* ------ State Machine Variables ----- */
 234         seq_printf(s, "a_bus_drop: %d\n", fsm->a_bus_drop);
 235
 236         seq_printf(s, "a_bus_req: %d\n", fsm->a_bus_req);
 237
 238         seq_printf(s, "a_srp_det: %d\n", fsm->a_srp_det);
 239
 240         seq_printf(s, "a_vbus_vld: %d\n", fsm->a_vbus_vld);
 241
 242         seq_printf(s, "b_conn: %d\n", fsm->b_conn);
 243
 244         seq_printf(s, "adp_change: %d\n", fsm->adp_change);
 245
 246         seq_printf(s, "power_up: %d\n", fsm->power_up);
 247
 248         seq_printf(s, "a_bus_resume: %d\n", fsm->a_bus_resume);
 249
 250         seq_printf(s, "a_bus_suspend: %d\n", fsm->a_bus_suspend);
 251
 252         seq_printf(s, "a_conn: %d\n", fsm->a_conn);
 253
 254         seq_printf(s, "b_bus_req: %d\n", fsm->b_bus_req);
 255
 256         seq_printf(s, "b_bus_suspend: %d\n", fsm->b_bus_suspend);
 257
 258         seq_printf(s, "b_se0_srp: %d\n", fsm->b_se0_srp);
 259
 260         seq_printf(s, "b_ssend_srp: %d\n", fsm->b_ssend_srp);
 261
 262         seq_printf(s, "b_sess_vld: %d\n", fsm->b_sess_vld);
 263
 264         seq_printf(s, "b_srp_done: %d\n", fsm->b_srp_done);
 265
 266         seq_printf(s, "drv_vbus: %d\n", fsm->drv_vbus);
 267
 268         seq_printf(s, "loc_conn: %d\n", fsm->loc_conn);
 269
 270         seq_printf(s, "loc_sof: %d\n", fsm->loc_sof);
 271
 272         seq_printf(s, "adp_prb: %d\n", fsm->adp_prb);
 273
 274         seq_printf(s, "id: %d\n", fsm->id);
 275
 276         seq_printf(s, "protocol: %d\n", fsm->protocol);
 277
 278         return 0;
 279 }
 280
 281 static int ci_otg_open(struct inode *inode, struct file *file)
 282 {
 283         return single_open(file, ci_otg_show, inode->i_private);
 284 }
 285
 286 static const struct file_operations ci_otg_fops = {
 287         .open                   = ci_otg_open,
 288         .read                   = seq_read,
 289         .llseek                 = seq_lseek,
 290         .release                = single_release,
 291 };
 292
 293 static int ci_role_show(struct seq_file *s, void *data)
 294 {
 295         struct ci_hdrc *ci = s->private;
 296
 297         if (ci->role != CI_ROLE_END)
 298                 seq_printf(s, "%s\n", ci_role(ci)->name);
 299
 300         return 0;
 301 }
 302
 303 static ssize_t ci_role_write(struct file *file, const char __user *ubuf,
 304                              size_t count, loff_t *ppos)
 305 {
 306         struct seq_file *s = file->private_data;
 307         struct ci_hdrc *ci = s->private;
 308         enum ci_role role;
 309         char buf[8];
 310         int ret;
 311
 312         if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 313                 return -EFAULT;
 314
 315         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 316                 if (ci->roles[role] &&
 317                     !strncmp(buf, ci->roles[role]->name,
 318                              strlen(ci->roles[role]->name)))
 319                         break;
 320
 321         if (role == CI_ROLE_END || role == ci->role)
 322                 return -EINVAL;
 323
 324         pm_runtime_get_sync(ci->dev);
 325         disable_irq(ci->irq);
 326         ci_role_stop(ci);
 327         ret = ci_role_start(ci, role);
 328         enable_irq(ci->irq);
 329         pm_runtime_put_sync(ci->dev);
 330
 331         return ret ? ret : count;
 332 }
 333
 334 static int ci_role_open(struct inode *inode, struct file *file)
 335 {
 336         return single_open(file, ci_role_show, inode->i_private);
 337 }
 338
 339 static const struct file_operations ci_role_fops = {
 340         .open           = ci_role_open,
 341         .write          = ci_role_write,
 342         .read           = seq_read,
 343         .llseek         = seq_lseek,
 344         .release        = single_release,
 345 };
 346
 347 static int ci_registers_show(struct seq_file *s, void *unused)
 348 {
 349         struct ci_hdrc *ci = s->private;
 350         u32 tmp_reg;
 351
 352         if (!ci || ci->in_lpm)
 353                 return -EPERM;
 354
 355         /* ------ Registers ----- */
 356         tmp_reg = hw_read_intr_enable(ci);
 357         seq_printf(s, "USBINTR reg: %08x\n", tmp_reg);
 358
 359         tmp_reg = hw_read_intr_status(ci);
 360         seq_printf(s, "USBSTS reg: %08x\n", tmp_reg);
 361
 362         tmp_reg = hw_read(ci, OP_USBMODE, ~0);
 363         seq_printf(s, "USBMODE reg: %08x\n", tmp_reg);
 364
 365         tmp_reg = hw_read(ci, OP_USBCMD, ~0);
 366         seq_printf(s, "USBCMD reg: %08x\n", tmp_reg);
 367
 368         tmp_reg = hw_read(ci, OP_PORTSC, ~0);
 369         seq_printf(s, "PORTSC reg: %08x\n", tmp_reg);
 370
 371         if (ci->is_otg) {
 372                 tmp_reg = hw_read_otgsc(ci, ~0);
 373                 seq_printf(s, "OTGSC reg: %08x\n", tmp_reg);
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int ci_registers_open(struct inode *inode, struct file *file)
 380 {
 381         return single_open(file, ci_registers_show, inode->i_private);
 382 }
 383
 384 static const struct file_operations ci_registers_fops = {
 385         .open                   = ci_registers_open,
 386         .read                   = seq_read,
 387         .llseek                 = seq_lseek,
 388         .release                = single_release,
 389 };
 390
 391 /**
 392  * dbg_create_files: initializes the attribute interface
 393  * @ci: device
 394  *
 395  * This function returns an error code
 396  */
 397 int dbg_create_files(struct ci_hdrc *ci)
 398 {
 399         struct dentry *dent;
 400
 401         ci->debugfs = debugfs_create_dir(dev_name(ci->dev), NULL);
 402         if (!ci->debugfs)
 403                 return -ENOMEM;
 404
 405         dent = debugfs_create_file("device", S_IRUGO, ci->debugfs, ci,
 406                                    &ci_device_fops);
 407         if (!dent)
 408                 goto err;
 409
 410         dent = debugfs_create_file("port_test", S_IRUGO | S_IWUSR, ci->debugfs,
 411                                    ci, &ci_port_test_fops);
 412         if (!dent)
 413                 goto err;
 414
 415         dent = debugfs_create_file("qheads", S_IRUGO, ci->debugfs, ci,
 416                                    &ci_qheads_fops);
 417         if (!dent)
 418                 goto err;
 419
 420         dent = debugfs_create_file("requests", S_IRUGO, ci->debugfs, ci,
 421                                    &ci_requests_fops);
 422         if (!dent)
 423                 goto err;
 424
 425         if (ci_otg_is_fsm_mode(ci)) {
 426                 dent = debugfs_create_file("otg", S_IRUGO, ci->debugfs, ci,
 427                                         &ci_otg_fops);
 428                 if (!dent)
 429                         goto err;
 430         }
 431
 432         dent = debugfs_create_file("role", S_IRUGO | S_IWUSR, ci->debugfs, ci,
 433                                    &ci_role_fops);
 434         if (!dent)
 435                 goto err;
 436
 437         dent = debugfs_create_file("registers", S_IRUGO, ci->debugfs, ci,
 438                                 &ci_registers_fops);
 439
 440         if (dent)
 441                 return 0;
 442 err:
 443         debugfs_remove_recursive(ci->debugfs);
 444         return -ENOMEM;
 445 }
 446
 447 /**
 448  * dbg_remove_files: destroys the attribute interface
 449  * @ci: device
 450  */
 451 void dbg_remove_files(struct ci_hdrc *ci)
 452 {
 453         debugfs_remove_recursive(ci->debugfs);
 454 }