drivers/mmc/core/debugfs.c

   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 "card.h"
  24 #include "host.h"
  25 #include "mmc_ops.h"
  26
  27 #ifdef CONFIG_FAIL_MMC_REQUEST
  28
  29 static DECLARE_FAULT_ATTR(fail_default_attr);
  30 static char *fail_request;
  31 module_param(fail_request, charp, 0);
  32
  33 #endif /* CONFIG_FAIL_MMC_REQUEST */
  34
  35 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
  36 static int mmc_ios_show(struct seq_file *s, void *data)
  37 {
  38         static const char *vdd_str[] = {
  39                 [8]     = "2.0",
  40                 [9]     = "2.1",
  41                 [10]    = "2.2",
  42                 [11]    = "2.3",
  43                 [12]    = "2.4",
  44                 [13]    = "2.5",
  45                 [14]    = "2.6",
  46                 [15]    = "2.7",
  47                 [16]    = "2.8",
  48                 [17]    = "2.9",
  49                 [18]    = "3.0",
  50                 [19]    = "3.1",
  51                 [20]    = "3.2",
  52                 [21]    = "3.3",
  53                 [22]    = "3.4",
  54                 [23]    = "3.5",
  55                 [24]    = "3.6",
  56         };
  57         struct mmc_host *host = s->private;
  58         struct mmc_ios  *ios = &host->ios;
  59         const char *str;
  60
  61         seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
  62         if (host->actual_clock)
  63                 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
  64         seq_printf(s, "vdd:\t\t%u ", ios->vdd);
  65         if ((1 << ios->vdd) & MMC_VDD_165_195)
  66                 seq_printf(s, "(1.65 - 1.95 V)\n");
  67         else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
  68                         && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
  69                 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
  70                                 vdd_str[ios->vdd + 1]);
  71         else
  72                 seq_printf(s, "(invalid)\n");
  73
  74         switch (ios->bus_mode) {
  75         case MMC_BUSMODE_OPENDRAIN:
  76                 str = "open drain";
  77                 break;
  78         case MMC_BUSMODE_PUSHPULL:
  79                 str = "push-pull";
  80                 break;
  81         default:
  82                 str = "invalid";
  83                 break;
  84         }
  85         seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
  86
  87         switch (ios->chip_select) {
  88         case MMC_CS_DONTCARE:
  89                 str = "don't care";
  90                 break;
  91         case MMC_CS_HIGH:
  92                 str = "active high";
  93                 break;
  94         case MMC_CS_LOW:
  95                 str = "active low";
  96                 break;
  97         default:
  98                 str = "invalid";
  99                 break;
 100         }
 101         seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
 102
 103         switch (ios->power_mode) {
 104         case MMC_POWER_OFF:
 105                 str = "off";
 106                 break;
 107         case MMC_POWER_UP:
 108                 str = "up";
 109                 break;
 110         case MMC_POWER_ON:
 111                 str = "on";
 112                 break;
 113         default:
 114                 str = "invalid";
 115                 break;
 116         }
 117         seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
 118         seq_printf(s, "bus width:\t%u (%u bits)\n",
 119                         ios->bus_width, 1 << ios->bus_width);
 120
 121         switch (ios->timing) {
 122         case MMC_TIMING_LEGACY:
 123                 str = "legacy";
 124                 break;
 125         case MMC_TIMING_MMC_HS:
 126                 str = "mmc high-speed";
 127                 break;
 128         case MMC_TIMING_SD_HS:
 129                 str = "sd high-speed";
 130                 break;
 131         case MMC_TIMING_UHS_SDR12:
 132                 str = "sd uhs SDR12";
 133                 break;
 134         case MMC_TIMING_UHS_SDR25:
 135                 str = "sd uhs SDR25";
 136                 break;
 137         case MMC_TIMING_UHS_SDR50:
 138                 str = "sd uhs SDR50";
 139                 break;
 140         case MMC_TIMING_UHS_SDR104:
 141                 str = "sd uhs SDR104";
 142                 break;
 143         case MMC_TIMING_UHS_DDR50:
 144                 str = "sd uhs DDR50";
 145                 break;
 146         case MMC_TIMING_MMC_DDR52:
 147                 str = "mmc DDR52";
 148                 break;
 149         case MMC_TIMING_MMC_HS200:
 150                 str = "mmc HS200";
 151                 break;
 152         case MMC_TIMING_MMC_HS400:
 153                 str = mmc_card_hs400es(host->card) ?
 154                         "mmc HS400 enhanced strobe" : "mmc HS400";
 155                 break;
 156         default:
 157                 str = "invalid";
 158                 break;
 159         }
 160         seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
 161
 162         switch (ios->signal_voltage) {
 163         case MMC_SIGNAL_VOLTAGE_330:
 164                 str = "3.30 V";
 165                 break;
 166         case MMC_SIGNAL_VOLTAGE_180:
 167                 str = "1.80 V";
 168                 break;
 169         case MMC_SIGNAL_VOLTAGE_120:
 170                 str = "1.20 V";
 171                 break;
 172         default:
 173                 str = "invalid";
 174                 break;
 175         }
 176         seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
 177
 178         switch (ios->drv_type) {
 179         case MMC_SET_DRIVER_TYPE_A:
 180                 str = "driver type A";
 181                 break;
 182         case MMC_SET_DRIVER_TYPE_B:
 183                 str = "driver type B";
 184                 break;
 185         case MMC_SET_DRIVER_TYPE_C:
 186                 str = "driver type C";
 187                 break;
 188         case MMC_SET_DRIVER_TYPE_D:
 189                 str = "driver type D";
 190                 break;
 191         default:
 192                 str = "invalid";
 193                 break;
 194         }
 195         seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
 196
 197         return 0;
 198 }
 199
 200 static int mmc_ios_open(struct inode *inode, struct file *file)
 201 {
 202         return single_open(file, mmc_ios_show, inode->i_private);
 203 }
 204
 205 static const struct file_operations mmc_ios_fops = {
 206         .open           = mmc_ios_open,
 207         .read           = seq_read,
 208         .llseek         = seq_lseek,
 209         .release        = single_release,
 210 };
 211
 212 static int mmc_clock_opt_get(void *data, u64 *val)
 213 {
 214         struct mmc_host *host = data;
 215
 216         *val = host->ios.clock;
 217
 218         return 0;
 219 }
 220
 221 static int mmc_clock_opt_set(void *data, u64 val)
 222 {
 223         struct mmc_host *host = data;
 224
 225         /* We need this check due to input value is u64 */
 226         if (val != 0 && (val > host->f_max || val < host->f_min))
 227                 return -EINVAL;
 228
 229         mmc_claim_host(host);
 230         mmc_set_clock(host, (unsigned int) val);
 231         mmc_release_host(host);
 232
 233         return 0;
 234 }
 235
 236 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
 237         "%llu\n");
 238
 239 void mmc_add_host_debugfs(struct mmc_host *host)
 240 {
 241         struct dentry *root;
 242
 243         root = debugfs_create_dir(mmc_hostname(host), NULL);
 244         if (IS_ERR(root))
 245                 /* Don't complain -- debugfs just isn't enabled */
 246                 return;
 247         if (!root)
 248                 /* Complain -- debugfs is enabled, but it failed to
 249                  * create the directory. */
 250                 goto err_root;
 251
 252         host->debugfs_root = root;
 253
 254         if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
 255                 goto err_node;
 256
 257         if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
 258                         &mmc_clock_fops))
 259                 goto err_node;
 260
 261 #ifdef CONFIG_FAIL_MMC_REQUEST
 262         if (fail_request)
 263                 setup_fault_attr(&fail_default_attr, fail_request);
 264         host->fail_mmc_request = fail_default_attr;
 265         if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
 266                                              root,
 267                                              &host->fail_mmc_request)))
 268                 goto err_node;
 269 #endif
 270         return;
 271
 272 err_node:
 273         debugfs_remove_recursive(root);
 274         host->debugfs_root = NULL;
 275 err_root:
 276         dev_err(&host->class_dev, "failed to initialize debugfs\n");
 277 }
 278
 279 void mmc_remove_host_debugfs(struct mmc_host *host)
 280 {
 281         debugfs_remove_recursive(host->debugfs_root);
 282 }
 283
 284 void mmc_add_card_debugfs(struct mmc_card *card)
 285 {
 286         struct mmc_host *host = card->host;
 287         struct dentry   *root;
 288
 289         if (!host->debugfs_root)
 290                 return;
 291
 292         root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
 293         if (IS_ERR(root))
 294                 /* Don't complain -- debugfs just isn't enabled */
 295                 return;
 296         if (!root)
 297                 /* Complain -- debugfs is enabled, but it failed to
 298                  * create the directory. */
 299                 goto err;
 300
 301         card->debugfs_root = root;
 302
 303         if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
 304                 goto err;
 305
 306         return;
 307
 308 err:
 309         debugfs_remove_recursive(root);
 310         card->debugfs_root = NULL;
 311         dev_err(&card->dev, "failed to initialize debugfs\n");
 312 }
 313
 314 void mmc_remove_card_debugfs(struct mmc_card *card)
 315 {
 316         debugfs_remove_recursive(card->debugfs_root);
 317         card->debugfs_root = NULL;
 318 }