drivers/net: Add export.h to files using EXPORT_SYMBOL/THIS_MODULE
[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 <linux/export.h>
30 #include "i2400m.h"
31
32
33 #define D_SUBMODULE debugfs
34 #include "debug-levels.h"
35
36 static
37 int debugfs_netdev_queue_stopped_get(void *data, u64 *val)
38 {
39         struct i2400m *i2400m = data;
40         *val = netif_queue_stopped(i2400m->wimax_dev.net_dev);
41         return 0;
42 }
43 DEFINE_SIMPLE_ATTRIBUTE(fops_netdev_queue_stopped,
44                         debugfs_netdev_queue_stopped_get,
45                         NULL, "%llu\n");
46
47
48 static
49 struct dentry *debugfs_create_netdev_queue_stopped(
50         const char *name, struct dentry *parent, struct i2400m *i2400m)
51 {
52         return debugfs_create_file(name, 0400, parent, i2400m,
53                                    &fops_netdev_queue_stopped);
54 }
55
56
57 /*
58  * inode->i_private has the @data argument to debugfs_create_file()
59  */
60 static
61 int i2400m_stats_open(struct inode *inode, struct file *filp)
62 {
63         filp->private_data = inode->i_private;
64         return 0;
65 }
66
67 /*
68  * We don't allow partial reads of this file, as then the reader would
69  * get weirdly confused data as it is updated.
70  *
71  * So or you read it all or nothing; if you try to read with an offset
72  * != 0, we consider you are done reading.
73  */
74 static
75 ssize_t i2400m_rx_stats_read(struct file *filp, char __user *buffer,
76                              size_t count, loff_t *ppos)
77 {
78         struct i2400m *i2400m = filp->private_data;
79         char buf[128];
80         unsigned long flags;
81
82         if (*ppos != 0)
83                 return 0;
84         if (count < sizeof(buf))
85                 return -ENOSPC;
86         spin_lock_irqsave(&i2400m->rx_lock, flags);
87         snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
88                  i2400m->rx_pl_num, i2400m->rx_pl_min,
89                  i2400m->rx_pl_max, i2400m->rx_num,
90                  i2400m->rx_size_acc,
91                  i2400m->rx_size_min, i2400m->rx_size_max);
92         spin_unlock_irqrestore(&i2400m->rx_lock, flags);
93         return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
94 }
95
96
97 /* Any write clears the stats */
98 static
99 ssize_t i2400m_rx_stats_write(struct file *filp, const char __user *buffer,
100                               size_t count, loff_t *ppos)
101 {
102         struct i2400m *i2400m = filp->private_data;
103         unsigned long flags;
104
105         spin_lock_irqsave(&i2400m->rx_lock, flags);
106         i2400m->rx_pl_num = 0;
107         i2400m->rx_pl_max = 0;
108         i2400m->rx_pl_min = UINT_MAX;
109         i2400m->rx_num = 0;
110         i2400m->rx_size_acc = 0;
111         i2400m->rx_size_min = UINT_MAX;
112         i2400m->rx_size_max = 0;
113         spin_unlock_irqrestore(&i2400m->rx_lock, flags);
114         return count;
115 }
116
117 static
118 const struct file_operations i2400m_rx_stats_fops = {
119         .owner =        THIS_MODULE,
120         .open =         i2400m_stats_open,
121         .read =         i2400m_rx_stats_read,
122         .write =        i2400m_rx_stats_write,
123         .llseek =       default_llseek,
124 };
125
126
127 /* See i2400m_rx_stats_read() */
128 static
129 ssize_t i2400m_tx_stats_read(struct file *filp, char __user *buffer,
130                              size_t count, loff_t *ppos)
131 {
132         struct i2400m *i2400m = filp->private_data;
133         char buf[128];
134         unsigned long flags;
135
136         if (*ppos != 0)
137                 return 0;
138         if (count < sizeof(buf))
139                 return -ENOSPC;
140         spin_lock_irqsave(&i2400m->tx_lock, flags);
141         snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
142                  i2400m->tx_pl_num, i2400m->tx_pl_min,
143                  i2400m->tx_pl_max, i2400m->tx_num,
144                  i2400m->tx_size_acc,
145                  i2400m->tx_size_min, i2400m->tx_size_max);
146         spin_unlock_irqrestore(&i2400m->tx_lock, flags);
147         return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
148 }
149
150 /* Any write clears the stats */
151 static
152 ssize_t i2400m_tx_stats_write(struct file *filp, const char __user *buffer,
153                               size_t count, loff_t *ppos)
154 {
155         struct i2400m *i2400m = filp->private_data;
156         unsigned long flags;
157
158         spin_lock_irqsave(&i2400m->tx_lock, flags);
159         i2400m->tx_pl_num = 0;
160         i2400m->tx_pl_max = 0;
161         i2400m->tx_pl_min = UINT_MAX;
162         i2400m->tx_num = 0;
163         i2400m->tx_size_acc = 0;
164         i2400m->tx_size_min = UINT_MAX;
165         i2400m->tx_size_max = 0;
166         spin_unlock_irqrestore(&i2400m->tx_lock, flags);
167         return count;
168 }
169
170 static
171 const struct file_operations i2400m_tx_stats_fops = {
172         .owner =        THIS_MODULE,
173         .open =         i2400m_stats_open,
174         .read =         i2400m_tx_stats_read,
175         .write =        i2400m_tx_stats_write,
176         .llseek =       default_llseek,
177 };
178
179
180 /* Write 1 to ask the device to go into suspend */
181 static
182 int debugfs_i2400m_suspend_set(void *data, u64 val)
183 {
184         int result;
185         struct i2400m *i2400m = data;
186         result = i2400m_cmd_enter_powersave(i2400m);
187         if (result >= 0)
188                 result = 0;
189         return result;
190 }
191 DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_suspend,
192                         NULL, debugfs_i2400m_suspend_set,
193                         "%llu\n");
194
195 static
196 struct dentry *debugfs_create_i2400m_suspend(
197         const char *name, struct dentry *parent, struct i2400m *i2400m)
198 {
199         return debugfs_create_file(name, 0200, parent, i2400m,
200                                    &fops_i2400m_suspend);
201 }
202
203
204 /*
205  * Reset the device
206  *
207  * Write 0 to ask the device to soft reset, 1 to cold reset, 2 to bus
208  * reset (as defined by enum i2400m_reset_type).
209  */
210 static
211 int debugfs_i2400m_reset_set(void *data, u64 val)
212 {
213         int result;
214         struct i2400m *i2400m = data;
215         enum i2400m_reset_type rt = val;
216         switch(rt) {
217         case I2400M_RT_WARM:
218         case I2400M_RT_COLD:
219         case I2400M_RT_BUS:
220                 result = i2400m_reset(i2400m, rt);
221                 if (result >= 0)
222                         result = 0;
223         default:
224                 result = -EINVAL;
225         }
226         return result;
227 }
228 DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_reset,
229                         NULL, debugfs_i2400m_reset_set,
230                         "%llu\n");
231
232 static
233 struct dentry *debugfs_create_i2400m_reset(
234         const char *name, struct dentry *parent, struct i2400m *i2400m)
235 {
236         return debugfs_create_file(name, 0200, parent, i2400m,
237                                    &fops_i2400m_reset);
238 }
239
240
241 #define __debugfs_register(prefix, name, parent)                        \
242 do {                                                                    \
243         result = d_level_register_debugfs(prefix, name, parent);        \
244         if (result < 0)                                                 \
245                 goto error;                                             \
246 } while (0)
247
248
249 int i2400m_debugfs_add(struct i2400m *i2400m)
250 {
251         int result;
252         struct device *dev = i2400m_dev(i2400m);
253         struct dentry *dentry = i2400m->wimax_dev.debugfs_dentry;
254         struct dentry *fd;
255
256         dentry = debugfs_create_dir("i2400m", dentry);
257         result = PTR_ERR(dentry);
258         if (IS_ERR(dentry)) {
259                 if (result == -ENODEV)
260                         result = 0;     /* No debugfs support */
261                 goto error;
262         }
263         i2400m->debugfs_dentry = dentry;
264         __debugfs_register("dl_", control, dentry);
265         __debugfs_register("dl_", driver, dentry);
266         __debugfs_register("dl_", debugfs, dentry);
267         __debugfs_register("dl_", fw, dentry);
268         __debugfs_register("dl_", netdev, dentry);
269         __debugfs_register("dl_", rfkill, dentry);
270         __debugfs_register("dl_", rx, dentry);
271         __debugfs_register("dl_", tx, dentry);
272
273         fd = debugfs_create_size_t("tx_in", 0400, dentry,
274                                    &i2400m->tx_in);
275         result = PTR_ERR(fd);
276         if (IS_ERR(fd) && result != -ENODEV) {
277                 dev_err(dev, "Can't create debugfs entry "
278                         "tx_in: %d\n", result);
279                 goto error;
280         }
281
282         fd = debugfs_create_size_t("tx_out", 0400, dentry,
283                                    &i2400m->tx_out);
284         result = PTR_ERR(fd);
285         if (IS_ERR(fd) && result != -ENODEV) {
286                 dev_err(dev, "Can't create debugfs entry "
287                         "tx_out: %d\n", result);
288                 goto error;
289         }
290
291         fd = debugfs_create_u32("state", 0600, dentry,
292                                 &i2400m->state);
293         result = PTR_ERR(fd);
294         if (IS_ERR(fd) && result != -ENODEV) {
295                 dev_err(dev, "Can't create debugfs entry "
296                         "state: %d\n", result);
297                 goto error;
298         }
299
300         /*
301          * Trace received messages from user space
302          *
303          * In order to tap the bidirectional message stream in the
304          * 'msg' pipe, user space can read from the 'msg' pipe;
305          * however, due to limitations in libnl, we can't know what
306          * the different applications are sending down to the kernel.
307          *
308          * So we have this hack where the driver will echo any message
309          * received on the msg pipe from user space [through a call to
310          * wimax_dev->op_msg_from_user() into
311          * i2400m_op_msg_from_user()] into the 'trace' pipe that this
312          * driver creates.
313          *
314          * So then, reading from both the 'trace' and 'msg' pipes in
315          * user space will provide a full dump of the traffic.
316          *
317          * Write 1 to activate, 0 to clear.
318          *
319          * It is not really very atomic, but it is also not too
320          * critical.
321          */
322         fd = debugfs_create_u8("trace_msg_from_user", 0600, dentry,
323                                &i2400m->trace_msg_from_user);
324         result = PTR_ERR(fd);
325         if (IS_ERR(fd) && result != -ENODEV) {
326                 dev_err(dev, "Can't create debugfs entry "
327                         "trace_msg_from_user: %d\n", result);
328                 goto error;
329         }
330
331         fd = debugfs_create_netdev_queue_stopped("netdev_queue_stopped",
332                                                  dentry, i2400m);
333         result = PTR_ERR(fd);
334         if (IS_ERR(fd) && result != -ENODEV) {
335                 dev_err(dev, "Can't create debugfs entry "
336                         "netdev_queue_stopped: %d\n", result);
337                 goto error;
338         }
339
340         fd = debugfs_create_file("rx_stats", 0600, dentry, i2400m,
341                                  &i2400m_rx_stats_fops);
342         result = PTR_ERR(fd);
343         if (IS_ERR(fd) && result != -ENODEV) {
344                 dev_err(dev, "Can't create debugfs entry "
345                         "rx_stats: %d\n", result);
346                 goto error;
347         }
348
349         fd = debugfs_create_file("tx_stats", 0600, dentry, i2400m,
350                                  &i2400m_tx_stats_fops);
351         result = PTR_ERR(fd);
352         if (IS_ERR(fd) && result != -ENODEV) {
353                 dev_err(dev, "Can't create debugfs entry "
354                         "tx_stats: %d\n", result);
355                 goto error;
356         }
357
358         fd = debugfs_create_i2400m_suspend("suspend", dentry, i2400m);
359         result = PTR_ERR(fd);
360         if (IS_ERR(fd) && result != -ENODEV) {
361                 dev_err(dev, "Can't create debugfs entry suspend: %d\n",
362                         result);
363                 goto error;
364         }
365
366         fd = debugfs_create_i2400m_reset("reset", dentry, i2400m);
367         result = PTR_ERR(fd);
368         if (IS_ERR(fd) && result != -ENODEV) {
369                 dev_err(dev, "Can't create debugfs entry reset: %d\n", result);
370                 goto error;
371         }
372
373         result = 0;
374 error:
375         return result;
376 }
377
378 void i2400m_debugfs_rm(struct i2400m *i2400m)
379 {
380         debugfs_remove_recursive(i2400m->debugfs_dentry);
381 }