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