Merge branches 'msm-fixes' and 'msm-video' of git://codeaurora.org/quic/kernel/dwalke...
[pandora-kernel.git] / drivers / net / wimax / i2400m / debugfs.c
1 /*
2  * Intel Wireless WiMAX Connection 2400m
3  * Debugfs interfaces to manipulate driver and device information
4  *
5  *
6  * Copyright (C) 2007 Intel Corporation <linux-wimax@intel.com>
7  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License version
11  * 2 as published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21  * 02110-1301, USA.
22  */
23
24 #include <linux/debugfs.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/spinlock.h>
28 #include <linux/device.h>
29 #include "i2400m.h"
30
31
32 #define D_SUBMODULE debugfs
33 #include "debug-levels.h"
34
35 static
36 int debugfs_netdev_queue_stopped_get(void *data, u64 *val)
37 {
38         struct i2400m *i2400m = data;
39         *val = netif_queue_stopped(i2400m->wimax_dev.net_dev);
40         return 0;
41 }
42 DEFINE_SIMPLE_ATTRIBUTE(fops_netdev_queue_stopped,
43                         debugfs_netdev_queue_stopped_get,
44                         NULL, "%llu\n");
45
46
47 static
48 struct dentry *debugfs_create_netdev_queue_stopped(
49         const char *name, struct dentry *parent, struct i2400m *i2400m)
50 {
51         return debugfs_create_file(name, 0400, parent, i2400m,
52                                    &fops_netdev_queue_stopped);
53 }
54
55
56 /*
57  * inode->i_private has the @data argument to debugfs_create_file()
58  */
59 static
60 int i2400m_stats_open(struct inode *inode, struct file *filp)
61 {
62         filp->private_data = inode->i_private;
63         return 0;
64 }
65
66 /*
67  * We don't allow partial reads of this file, as then the reader would
68  * get weirdly confused data as it is updated.
69  *
70  * So or you read it all or nothing; if you try to read with an offset
71  * != 0, we consider you are done reading.
72  */
73 static
74 ssize_t i2400m_rx_stats_read(struct file *filp, char __user *buffer,
75                              size_t count, loff_t *ppos)
76 {
77         struct i2400m *i2400m = filp->private_data;
78         char buf[128];
79         unsigned long flags;
80
81         if (*ppos != 0)
82                 return 0;
83         if (count < sizeof(buf))
84                 return -ENOSPC;
85         spin_lock_irqsave(&i2400m->rx_lock, flags);
86         snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
87                  i2400m->rx_pl_num, i2400m->rx_pl_min,
88                  i2400m->rx_pl_max, i2400m->rx_num,
89                  i2400m->rx_size_acc,
90                  i2400m->rx_size_min, i2400m->rx_size_max);
91         spin_unlock_irqrestore(&i2400m->rx_lock, flags);
92         return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
93 }
94
95
96 /* Any write clears the stats */
97 static
98 ssize_t i2400m_rx_stats_write(struct file *filp, const char __user *buffer,
99                               size_t count, loff_t *ppos)
100 {
101         struct i2400m *i2400m = filp->private_data;
102         unsigned long flags;
103
104         spin_lock_irqsave(&i2400m->rx_lock, flags);
105         i2400m->rx_pl_num = 0;
106         i2400m->rx_pl_max = 0;
107         i2400m->rx_pl_min = UINT_MAX;
108         i2400m->rx_num = 0;
109         i2400m->rx_size_acc = 0;
110         i2400m->rx_size_min = UINT_MAX;
111         i2400m->rx_size_max = 0;
112         spin_unlock_irqrestore(&i2400m->rx_lock, flags);
113         return count;
114 }
115
116 static
117 const struct file_operations i2400m_rx_stats_fops = {
118         .owner =        THIS_MODULE,
119         .open =         i2400m_stats_open,
120         .read =         i2400m_rx_stats_read,
121         .write =        i2400m_rx_stats_write,
122         .llseek =       default_llseek,
123 };
124
125
126 /* See i2400m_rx_stats_read() */
127 static
128 ssize_t i2400m_tx_stats_read(struct file *filp, char __user *buffer,
129                              size_t count, loff_t *ppos)
130 {
131         struct i2400m *i2400m = filp->private_data;
132         char buf[128];
133         unsigned long flags;
134
135         if (*ppos != 0)
136                 return 0;
137         if (count < sizeof(buf))
138                 return -ENOSPC;
139         spin_lock_irqsave(&i2400m->tx_lock, flags);
140         snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
141                  i2400m->tx_pl_num, i2400m->tx_pl_min,
142                  i2400m->tx_pl_max, i2400m->tx_num,
143                  i2400m->tx_size_acc,
144                  i2400m->tx_size_min, i2400m->tx_size_max);
145         spin_unlock_irqrestore(&i2400m->tx_lock, flags);
146         return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
147 }
148
149 /* Any write clears the stats */
150 static
151 ssize_t i2400m_tx_stats_write(struct file *filp, const char __user *buffer,
152                               size_t count, loff_t *ppos)
153 {
154         struct i2400m *i2400m = filp->private_data;
155         unsigned long flags;
156
157         spin_lock_irqsave(&i2400m->tx_lock, flags);
158         i2400m->tx_pl_num = 0;
159         i2400m->tx_pl_max = 0;
160         i2400m->tx_pl_min = UINT_MAX;
161         i2400m->tx_num = 0;
162         i2400m->tx_size_acc = 0;
163         i2400m->tx_size_min = UINT_MAX;
164         i2400m->tx_size_max = 0;
165         spin_unlock_irqrestore(&i2400m->tx_lock, flags);
166         return count;
167 }
168
169 static
170 const struct file_operations i2400m_tx_stats_fops = {
171         .owner =        THIS_MODULE,
172         .open =         i2400m_stats_open,
173         .read =         i2400m_tx_stats_read,
174         .write =        i2400m_tx_stats_write,
175         .llseek =       default_llseek,
176 };
177
178
179 /* Write 1 to ask the device to go into suspend */
180 static
181 int debugfs_i2400m_suspend_set(void *data, u64 val)
182 {
183         int result;
184         struct i2400m *i2400m = data;
185         result = i2400m_cmd_enter_powersave(i2400m);
186         if (result >= 0)
187                 result = 0;
188         return result;
189 }
190 DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_suspend,
191                         NULL, debugfs_i2400m_suspend_set,
192                         "%llu\n");
193
194 static
195 struct dentry *debugfs_create_i2400m_suspend(
196         const char *name, struct dentry *parent, struct i2400m *i2400m)
197 {
198         return debugfs_create_file(name, 0200, parent, i2400m,
199                                    &fops_i2400m_suspend);
200 }
201
202
203 /*
204  * Reset the device
205  *
206  * Write 0 to ask the device to soft reset, 1 to cold reset, 2 to bus
207  * reset (as defined by enum i2400m_reset_type).
208  */
209 static
210 int debugfs_i2400m_reset_set(void *data, u64 val)
211 {
212         int result;
213         struct i2400m *i2400m = data;
214         enum i2400m_reset_type rt = val;
215         switch(rt) {
216         case I2400M_RT_WARM:
217         case I2400M_RT_COLD:
218         case I2400M_RT_BUS:
219                 result = i2400m_reset(i2400m, rt);
220                 if (result >= 0)
221                         result = 0;
222         default:
223                 result = -EINVAL;
224         }
225         return result;
226 }
227 DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_reset,
228                         NULL, debugfs_i2400m_reset_set,
229                         "%llu\n");
230
231 static
232 struct dentry *debugfs_create_i2400m_reset(
233         const char *name, struct dentry *parent, struct i2400m *i2400m)
234 {
235         return debugfs_create_file(name, 0200, parent, i2400m,
236                                    &fops_i2400m_reset);
237 }
238
239
240 #define __debugfs_register(prefix, name, parent)                        \
241 do {                                                                    \
242         result = d_level_register_debugfs(prefix, name, parent);        \
243         if (result < 0)                                                 \
244                 goto error;                                             \
245 } while (0)
246
247
248 int i2400m_debugfs_add(struct i2400m *i2400m)
249 {
250         int result;
251         struct device *dev = i2400m_dev(i2400m);
252         struct dentry *dentry = i2400m->wimax_dev.debugfs_dentry;
253         struct dentry *fd;
254
255         dentry = debugfs_create_dir("i2400m", dentry);
256         result = PTR_ERR(dentry);
257         if (IS_ERR(dentry)) {
258                 if (result == -ENODEV)
259                         result = 0;     /* No debugfs support */
260                 goto error;
261         }
262         i2400m->debugfs_dentry = dentry;
263         __debugfs_register("dl_", control, dentry);
264         __debugfs_register("dl_", driver, dentry);
265         __debugfs_register("dl_", debugfs, dentry);
266         __debugfs_register("dl_", fw, dentry);
267         __debugfs_register("dl_", netdev, dentry);
268         __debugfs_register("dl_", rfkill, dentry);
269         __debugfs_register("dl_", rx, dentry);
270         __debugfs_register("dl_", tx, dentry);
271
272         fd = debugfs_create_size_t("tx_in", 0400, dentry,
273                                    &i2400m->tx_in);
274         result = PTR_ERR(fd);
275         if (IS_ERR(fd) && result != -ENODEV) {
276                 dev_err(dev, "Can't create debugfs entry "
277                         "tx_in: %d\n", result);
278                 goto error;
279         }
280
281         fd = debugfs_create_size_t("tx_out", 0400, dentry,
282                                    &i2400m->tx_out);
283         result = PTR_ERR(fd);
284         if (IS_ERR(fd) && result != -ENODEV) {
285                 dev_err(dev, "Can't create debugfs entry "
286                         "tx_out: %d\n", result);
287                 goto error;
288         }
289
290         fd = debugfs_create_u32("state", 0600, dentry,
291                                 &i2400m->state);
292         result = PTR_ERR(fd);
293         if (IS_ERR(fd) && result != -ENODEV) {
294                 dev_err(dev, "Can't create debugfs entry "
295                         "state: %d\n", result);
296                 goto error;
297         }
298
299         /*
300          * Trace received messages from user space
301          *
302          * In order to tap the bidirectional message stream in the
303          * 'msg' pipe, user space can read from the 'msg' pipe;
304          * however, due to limitations in libnl, we can't know what
305          * the different applications are sending down to the kernel.
306          *
307          * So we have this hack where the driver will echo any message
308          * received on the msg pipe from user space [through a call to
309          * wimax_dev->op_msg_from_user() into
310          * i2400m_op_msg_from_user()] into the 'trace' pipe that this
311          * driver creates.
312          *
313          * So then, reading from both the 'trace' and 'msg' pipes in
314          * user space will provide a full dump of the traffic.
315          *
316          * Write 1 to activate, 0 to clear.
317          *
318          * It is not really very atomic, but it is also not too
319          * critical.
320          */
321         fd = debugfs_create_u8("trace_msg_from_user", 0600, dentry,
322                                &i2400m->trace_msg_from_user);
323         result = PTR_ERR(fd);
324         if (IS_ERR(fd) && result != -ENODEV) {
325                 dev_err(dev, "Can't create debugfs entry "
326                         "trace_msg_from_user: %d\n", result);
327                 goto error;
328         }
329
330         fd = debugfs_create_netdev_queue_stopped("netdev_queue_stopped",
331                                                  dentry, i2400m);
332         result = PTR_ERR(fd);
333         if (IS_ERR(fd) && result != -ENODEV) {
334                 dev_err(dev, "Can't create debugfs entry "
335                         "netdev_queue_stopped: %d\n", result);
336                 goto error;
337         }
338
339         fd = debugfs_create_file("rx_stats", 0600, dentry, i2400m,
340                                  &i2400m_rx_stats_fops);
341         result = PTR_ERR(fd);
342         if (IS_ERR(fd) && result != -ENODEV) {
343                 dev_err(dev, "Can't create debugfs entry "
344                         "rx_stats: %d\n", result);
345                 goto error;
346         }
347
348         fd = debugfs_create_file("tx_stats", 0600, dentry, i2400m,
349                                  &i2400m_tx_stats_fops);
350         result = PTR_ERR(fd);
351         if (IS_ERR(fd) && result != -ENODEV) {
352                 dev_err(dev, "Can't create debugfs entry "
353                         "tx_stats: %d\n", result);
354                 goto error;
355         }
356
357         fd = debugfs_create_i2400m_suspend("suspend", dentry, i2400m);
358         result = PTR_ERR(fd);
359         if (IS_ERR(fd) && result != -ENODEV) {
360                 dev_err(dev, "Can't create debugfs entry suspend: %d\n",
361                         result);
362                 goto error;
363         }
364
365         fd = debugfs_create_i2400m_reset("reset", dentry, i2400m);
366         result = PTR_ERR(fd);
367         if (IS_ERR(fd) && result != -ENODEV) {
368                 dev_err(dev, "Can't create debugfs entry reset: %d\n", result);
369                 goto error;
370         }
371
372         result = 0;
373 error:
374         return result;
375 }
376
377 void i2400m_debugfs_rm(struct i2400m *i2400m)
378 {
379         debugfs_remove_recursive(i2400m->debugfs_dentry);
380 }