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 */
ci_device_show(struct seq_file * s,void * data)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
ci_device_open(struct inode * inode,struct file * file)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 */
ci_port_test_show(struct seq_file * s,void * data)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 */
ci_port_test_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)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
ci_port_test_open(struct inode * inode,struct file * file)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 */
ci_qheads_show(struct seq_file * s,void * data)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
ci_qheads_open(struct inode * inode,struct file * file)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 */
ci_requests_show(struct seq_file * s,void * data)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
ci_requests_open(struct inode * inode,struct file * file)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
ci_otg_show(struct seq_file * s,void * unused)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
ci_otg_open(struct inode * inode,struct file * file)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
ci_role_show(struct seq_file * s,void * data)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
ci_role_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)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
ci_role_open(struct inode * inode,struct file * file)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
ci_registers_show(struct seq_file * s,void * unused)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
ci_registers_open(struct inode * inode,struct file * file)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 */
dbg_create_files(struct ci_hdrc * ci)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 */
dbg_remove_files(struct ci_hdrc * ci)451 void dbg_remove_files(struct ci_hdrc *ci)
452 {
453 debugfs_remove_recursive(ci->debugfs);
454 }
455