xref: /openbmc/linux/drivers/usb/chipidea/debug.c (revision b34e08d5)
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 
11 #include "ci.h"
12 #include "udc.h"
13 #include "bits.h"
14 #include "debug.h"
15 
16 /**
17  * ci_device_show: prints information about device capabilities and status
18  */
19 static int ci_device_show(struct seq_file *s, void *data)
20 {
21 	struct ci_hdrc *ci = s->private;
22 	struct usb_gadget *gadget = &ci->gadget;
23 
24 	seq_printf(s, "speed             = %d\n", gadget->speed);
25 	seq_printf(s, "max_speed         = %d\n", gadget->max_speed);
26 	seq_printf(s, "is_otg            = %d\n", gadget->is_otg);
27 	seq_printf(s, "is_a_peripheral   = %d\n", gadget->is_a_peripheral);
28 	seq_printf(s, "b_hnp_enable      = %d\n", gadget->b_hnp_enable);
29 	seq_printf(s, "a_hnp_support     = %d\n", gadget->a_hnp_support);
30 	seq_printf(s, "a_alt_hnp_support = %d\n", gadget->a_alt_hnp_support);
31 	seq_printf(s, "name              = %s\n",
32 		   (gadget->name ? gadget->name : ""));
33 
34 	if (!ci->driver)
35 		return 0;
36 
37 	seq_printf(s, "gadget function   = %s\n",
38 		       (ci->driver->function ? ci->driver->function : ""));
39 	seq_printf(s, "gadget max speed  = %d\n", ci->driver->max_speed);
40 
41 	return 0;
42 }
43 
44 static int ci_device_open(struct inode *inode, struct file *file)
45 {
46 	return single_open(file, ci_device_show, inode->i_private);
47 }
48 
49 static const struct file_operations ci_device_fops = {
50 	.open		= ci_device_open,
51 	.read		= seq_read,
52 	.llseek		= seq_lseek,
53 	.release	= single_release,
54 };
55 
56 /**
57  * ci_port_test_show: reads port test mode
58  */
59 static int ci_port_test_show(struct seq_file *s, void *data)
60 {
61 	struct ci_hdrc *ci = s->private;
62 	unsigned long flags;
63 	unsigned mode;
64 
65 	spin_lock_irqsave(&ci->lock, flags);
66 	mode = hw_port_test_get(ci);
67 	spin_unlock_irqrestore(&ci->lock, flags);
68 
69 	seq_printf(s, "mode = %u\n", mode);
70 
71 	return 0;
72 }
73 
74 /**
75  * ci_port_test_write: writes port test mode
76  */
77 static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf,
78 				  size_t count, loff_t *ppos)
79 {
80 	struct seq_file *s = file->private_data;
81 	struct ci_hdrc *ci = s->private;
82 	unsigned long flags;
83 	unsigned mode;
84 	char buf[32];
85 	int ret;
86 
87 	if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
88 		return -EFAULT;
89 
90 	if (sscanf(buf, "%u", &mode) != 1)
91 		return -EINVAL;
92 
93 	spin_lock_irqsave(&ci->lock, flags);
94 	ret = hw_port_test_set(ci, mode);
95 	spin_unlock_irqrestore(&ci->lock, flags);
96 
97 	return ret ? ret : count;
98 }
99 
100 static int ci_port_test_open(struct inode *inode, struct file *file)
101 {
102 	return single_open(file, ci_port_test_show, inode->i_private);
103 }
104 
105 static const struct file_operations ci_port_test_fops = {
106 	.open		= ci_port_test_open,
107 	.write		= ci_port_test_write,
108 	.read		= seq_read,
109 	.llseek		= seq_lseek,
110 	.release	= single_release,
111 };
112 
113 /**
114  * ci_qheads_show: DMA contents of all queue heads
115  */
116 static int ci_qheads_show(struct seq_file *s, void *data)
117 {
118 	struct ci_hdrc *ci = s->private;
119 	unsigned long flags;
120 	unsigned i, j;
121 
122 	if (ci->role != CI_ROLE_GADGET) {
123 		seq_printf(s, "not in gadget mode\n");
124 		return 0;
125 	}
126 
127 	spin_lock_irqsave(&ci->lock, flags);
128 	for (i = 0; i < ci->hw_ep_max/2; i++) {
129 		struct ci_hw_ep *hweprx = &ci->ci_hw_ep[i];
130 		struct ci_hw_ep *hweptx =
131 			&ci->ci_hw_ep[i + ci->hw_ep_max/2];
132 		seq_printf(s, "EP=%02i: RX=%08X TX=%08X\n",
133 			   i, (u32)hweprx->qh.dma, (u32)hweptx->qh.dma);
134 		for (j = 0; j < (sizeof(struct ci_hw_qh)/sizeof(u32)); j++)
135 			seq_printf(s, " %04X:    %08X    %08X\n", j,
136 				   *((u32 *)hweprx->qh.ptr + j),
137 				   *((u32 *)hweptx->qh.ptr + j));
138 	}
139 	spin_unlock_irqrestore(&ci->lock, flags);
140 
141 	return 0;
142 }
143 
144 static int ci_qheads_open(struct inode *inode, struct file *file)
145 {
146 	return single_open(file, ci_qheads_show, inode->i_private);
147 }
148 
149 static const struct file_operations ci_qheads_fops = {
150 	.open		= ci_qheads_open,
151 	.read		= seq_read,
152 	.llseek		= seq_lseek,
153 	.release	= single_release,
154 };
155 
156 /**
157  * ci_requests_show: DMA contents of all requests currently queued (all endpts)
158  */
159 static int ci_requests_show(struct seq_file *s, void *data)
160 {
161 	struct ci_hdrc *ci = s->private;
162 	unsigned long flags;
163 	struct list_head   *ptr = NULL;
164 	struct ci_hw_req *req = NULL;
165 	struct td_node *node, *tmpnode;
166 	unsigned i, j, qsize = sizeof(struct ci_hw_td)/sizeof(u32);
167 
168 	if (ci->role != CI_ROLE_GADGET) {
169 		seq_printf(s, "not in gadget mode\n");
170 		return 0;
171 	}
172 
173 	spin_lock_irqsave(&ci->lock, flags);
174 	for (i = 0; i < ci->hw_ep_max; i++)
175 		list_for_each(ptr, &ci->ci_hw_ep[i].qh.queue) {
176 			req = list_entry(ptr, struct ci_hw_req, queue);
177 
178 			list_for_each_entry_safe(node, tmpnode, &req->tds, td) {
179 				seq_printf(s, "EP=%02i: TD=%08X %s\n",
180 					   i % (ci->hw_ep_max / 2),
181 					   (u32)node->dma,
182 					   ((i < ci->hw_ep_max/2) ?
183 					   "RX" : "TX"));
184 
185 				for (j = 0; j < qsize; j++)
186 					seq_printf(s, " %04X:    %08X\n", j,
187 						   *((u32 *)node->ptr + j));
188 			}
189 		}
190 	spin_unlock_irqrestore(&ci->lock, flags);
191 
192 	return 0;
193 }
194 
195 static int ci_requests_open(struct inode *inode, struct file *file)
196 {
197 	return single_open(file, ci_requests_show, inode->i_private);
198 }
199 
200 static const struct file_operations ci_requests_fops = {
201 	.open		= ci_requests_open,
202 	.read		= seq_read,
203 	.llseek		= seq_lseek,
204 	.release	= single_release,
205 };
206 
207 static int ci_role_show(struct seq_file *s, void *data)
208 {
209 	struct ci_hdrc *ci = s->private;
210 
211 	seq_printf(s, "%s\n", ci_role(ci)->name);
212 
213 	return 0;
214 }
215 
216 static ssize_t ci_role_write(struct file *file, const char __user *ubuf,
217 			     size_t count, loff_t *ppos)
218 {
219 	struct seq_file *s = file->private_data;
220 	struct ci_hdrc *ci = s->private;
221 	enum ci_role role;
222 	char buf[8];
223 	int ret;
224 
225 	if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
226 		return -EFAULT;
227 
228 	for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
229 		if (ci->roles[role] &&
230 		    !strncmp(buf, ci->roles[role]->name,
231 			     strlen(ci->roles[role]->name)))
232 			break;
233 
234 	if (role == CI_ROLE_END || role == ci->role)
235 		return -EINVAL;
236 
237 	ci_role_stop(ci);
238 	ret = ci_role_start(ci, role);
239 
240 	return ret ? ret : count;
241 }
242 
243 static int ci_role_open(struct inode *inode, struct file *file)
244 {
245 	return single_open(file, ci_role_show, inode->i_private);
246 }
247 
248 static const struct file_operations ci_role_fops = {
249 	.open		= ci_role_open,
250 	.write		= ci_role_write,
251 	.read		= seq_read,
252 	.llseek		= seq_lseek,
253 	.release	= single_release,
254 };
255 
256 /**
257  * dbg_create_files: initializes the attribute interface
258  * @ci: device
259  *
260  * This function returns an error code
261  */
262 int dbg_create_files(struct ci_hdrc *ci)
263 {
264 	struct dentry *dent;
265 
266 	ci->debugfs = debugfs_create_dir(dev_name(ci->dev), NULL);
267 	if (!ci->debugfs)
268 		return -ENOMEM;
269 
270 	dent = debugfs_create_file("device", S_IRUGO, ci->debugfs, ci,
271 				   &ci_device_fops);
272 	if (!dent)
273 		goto err;
274 
275 	dent = debugfs_create_file("port_test", S_IRUGO | S_IWUSR, ci->debugfs,
276 				   ci, &ci_port_test_fops);
277 	if (!dent)
278 		goto err;
279 
280 	dent = debugfs_create_file("qheads", S_IRUGO, ci->debugfs, ci,
281 				   &ci_qheads_fops);
282 	if (!dent)
283 		goto err;
284 
285 	dent = debugfs_create_file("requests", S_IRUGO, ci->debugfs, ci,
286 				   &ci_requests_fops);
287 	if (!dent)
288 		goto err;
289 
290 	dent = debugfs_create_file("role", S_IRUGO | S_IWUSR, ci->debugfs, ci,
291 				   &ci_role_fops);
292 	if (dent)
293 		return 0;
294 err:
295 	debugfs_remove_recursive(ci->debugfs);
296 	return -ENOMEM;
297 }
298 
299 /**
300  * dbg_remove_files: destroys the attribute interface
301  * @ci: device
302  */
303 void dbg_remove_files(struct ci_hdrc *ci)
304 {
305 	debugfs_remove_recursive(ci->debugfs);
306 }
307