Linux Kernel  3.7.1
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debugfs.c
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1 /*
2  * Debugfs support for hosts and cards
3  *
4  * Copyright (C) 2008 Atmel Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/moduleparam.h>
11 #include <linux/export.h>
12 #include <linux/debugfs.h>
13 #include <linux/fs.h>
14 #include <linux/seq_file.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/fault-inject.h>
18 
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/host.h>
21 
22 #include "core.h"
23 #include "mmc_ops.h"
24 
25 #ifdef CONFIG_FAIL_MMC_REQUEST
26 
27 static DECLARE_FAULT_ATTR(fail_default_attr);
28 static char *fail_request;
29 module_param(fail_request, charp, 0);
30 
31 #endif /* CONFIG_FAIL_MMC_REQUEST */
32 
33 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
34 static int mmc_ios_show(struct seq_file *s, void *data)
35 {
36  static const char *vdd_str[] = {
37  [8] = "2.0",
38  [9] = "2.1",
39  [10] = "2.2",
40  [11] = "2.3",
41  [12] = "2.4",
42  [13] = "2.5",
43  [14] = "2.6",
44  [15] = "2.7",
45  [16] = "2.8",
46  [17] = "2.9",
47  [18] = "3.0",
48  [19] = "3.1",
49  [20] = "3.2",
50  [21] = "3.3",
51  [22] = "3.4",
52  [23] = "3.5",
53  [24] = "3.6",
54  };
55  struct mmc_host *host = s->private;
56  struct mmc_ios *ios = &host->ios;
57  const char *str;
58 
59  seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
60  if (host->actual_clock)
61  seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
62  seq_printf(s, "vdd:\t\t%u ", ios->vdd);
63  if ((1 << ios->vdd) & MMC_VDD_165_195)
64  seq_printf(s, "(1.65 - 1.95 V)\n");
65  else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
66  && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
67  seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
68  vdd_str[ios->vdd + 1]);
69  else
70  seq_printf(s, "(invalid)\n");
71 
72  switch (ios->bus_mode) {
74  str = "open drain";
75  break;
77  str = "push-pull";
78  break;
79  default:
80  str = "invalid";
81  break;
82  }
83  seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
84 
85  switch (ios->chip_select) {
86  case MMC_CS_DONTCARE:
87  str = "don't care";
88  break;
89  case MMC_CS_HIGH:
90  str = "active high";
91  break;
92  case MMC_CS_LOW:
93  str = "active low";
94  break;
95  default:
96  str = "invalid";
97  break;
98  }
99  seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
100 
101  switch (ios->power_mode) {
102  case MMC_POWER_OFF:
103  str = "off";
104  break;
105  case MMC_POWER_UP:
106  str = "up";
107  break;
108  case MMC_POWER_ON:
109  str = "on";
110  break;
111  default:
112  str = "invalid";
113  break;
114  }
115  seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
116  seq_printf(s, "bus width:\t%u (%u bits)\n",
117  ios->bus_width, 1 << ios->bus_width);
118 
119  switch (ios->timing) {
120  case MMC_TIMING_LEGACY:
121  str = "legacy";
122  break;
123  case MMC_TIMING_MMC_HS:
124  str = "mmc high-speed";
125  break;
126  case MMC_TIMING_SD_HS:
127  str = "sd high-speed";
128  break;
130  str = "sd uhs SDR50";
131  break;
133  str = "sd uhs SDR104";
134  break;
136  str = "sd uhs DDR50";
137  break;
139  str = "mmc high-speed SDR200";
140  break;
141  default:
142  str = "invalid";
143  break;
144  }
145  seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
146 
147  return 0;
148 }
149 
150 static int mmc_ios_open(struct inode *inode, struct file *file)
151 {
152  return single_open(file, mmc_ios_show, inode->i_private);
153 }
154 
155 static const struct file_operations mmc_ios_fops = {
156  .open = mmc_ios_open,
157  .read = seq_read,
158  .llseek = seq_lseek,
159  .release = single_release,
160 };
161 
162 static int mmc_clock_opt_get(void *data, u64 *val)
163 {
164  struct mmc_host *host = data;
165 
166  *val = host->ios.clock;
167 
168  return 0;
169 }
170 
171 static int mmc_clock_opt_set(void *data, u64 val)
172 {
173  struct mmc_host *host = data;
174 
175  /* We need this check due to input value is u64 */
176  if (val > host->f_max)
177  return -EINVAL;
178 
179  mmc_claim_host(host);
180  mmc_set_clock(host, (unsigned int) val);
181  mmc_release_host(host);
182 
183  return 0;
184 }
185 
186 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
187  "%llu\n");
188 
189 void mmc_add_host_debugfs(struct mmc_host *host)
190 {
191  struct dentry *root;
192 
193  root = debugfs_create_dir(mmc_hostname(host), NULL);
194  if (IS_ERR(root))
195  /* Don't complain -- debugfs just isn't enabled */
196  return;
197  if (!root)
198  /* Complain -- debugfs is enabled, but it failed to
199  * create the directory. */
200  goto err_root;
201 
202  host->debugfs_root = root;
203 
204  if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
205  goto err_node;
206 
207  if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
208  &mmc_clock_fops))
209  goto err_node;
210 
211 #ifdef CONFIG_MMC_CLKGATE
212  if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
213  root, &host->clk_delay))
214  goto err_node;
215 #endif
216 #ifdef CONFIG_FAIL_MMC_REQUEST
217  if (fail_request)
218  setup_fault_attr(&fail_default_attr, fail_request);
219  host->fail_mmc_request = fail_default_attr;
220  if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
221  root,
222  &host->fail_mmc_request)))
223  goto err_node;
224 #endif
225  return;
226 
227 err_node:
229  host->debugfs_root = NULL;
230 err_root:
231  dev_err(&host->class_dev, "failed to initialize debugfs\n");
232 }
233 
235 {
237 }
238 
239 static int mmc_dbg_card_status_get(void *data, u64 *val)
240 {
241  struct mmc_card *card = data;
242  u32 status;
243  int ret;
244 
245  mmc_claim_host(card->host);
246 
247  ret = mmc_send_status(data, &status);
248  if (!ret)
249  *val = status;
250 
251  mmc_release_host(card->host);
252 
253  return ret;
254 }
255 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
256  NULL, "%08llx\n");
257 
258 #define EXT_CSD_STR_LEN 1025
259 
260 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
261 {
262  struct mmc_card *card = inode->i_private;
263  char *buf;
264  ssize_t n = 0;
265  u8 *ext_csd;
266  int err, i;
267 
268  buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
269  if (!buf)
270  return -ENOMEM;
271 
272  ext_csd = kmalloc(512, GFP_KERNEL);
273  if (!ext_csd) {
274  err = -ENOMEM;
275  goto out_free;
276  }
277 
278  mmc_claim_host(card->host);
279  err = mmc_send_ext_csd(card, ext_csd);
280  mmc_release_host(card->host);
281  if (err)
282  goto out_free;
283 
284  for (i = 0; i < 512; i++)
285  n += sprintf(buf + n, "%02x", ext_csd[i]);
286  n += sprintf(buf + n, "\n");
287  BUG_ON(n != EXT_CSD_STR_LEN);
288 
289  filp->private_data = buf;
290  kfree(ext_csd);
291  return 0;
292 
293 out_free:
294  kfree(buf);
295  kfree(ext_csd);
296  return err;
297 }
298 
299 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
300  size_t cnt, loff_t *ppos)
301 {
302  char *buf = filp->private_data;
303 
304  return simple_read_from_buffer(ubuf, cnt, ppos,
305  buf, EXT_CSD_STR_LEN);
306 }
307 
308 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
309 {
310  kfree(file->private_data);
311  return 0;
312 }
313 
314 static const struct file_operations mmc_dbg_ext_csd_fops = {
315  .open = mmc_ext_csd_open,
316  .read = mmc_ext_csd_read,
317  .release = mmc_ext_csd_release,
318  .llseek = default_llseek,
319 };
320 
321 void mmc_add_card_debugfs(struct mmc_card *card)
322 {
323  struct mmc_host *host = card->host;
324  struct dentry *root;
325 
326  if (!host->debugfs_root)
327  return;
328 
329  root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
330  if (IS_ERR(root))
331  /* Don't complain -- debugfs just isn't enabled */
332  return;
333  if (!root)
334  /* Complain -- debugfs is enabled, but it failed to
335  * create the directory. */
336  goto err;
337 
338  card->debugfs_root = root;
339 
340  if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
341  goto err;
342 
343  if (mmc_card_mmc(card) || mmc_card_sd(card))
344  if (!debugfs_create_file("status", S_IRUSR, root, card,
345  &mmc_dbg_card_status_fops))
346  goto err;
347 
348  if (mmc_card_mmc(card))
349  if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
350  &mmc_dbg_ext_csd_fops))
351  goto err;
352 
353  return;
354 
355 err:
357  card->debugfs_root = NULL;
358  dev_err(&card->dev, "failed to initialize debugfs\n");
359 }
360 
362 {
364 }