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/debugfs.h>
  11 #include <linux/fs.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/slab.h>
  14 #include <linux/stat.h>
  15
  16 #include <linux/mmc/card.h>
  17 #include <linux/mmc/host.h>
  18
  19 #include "core.h"
  20 #include "mmc_ops.h"
  21
  22 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
  23 static int mmc_ios_show(struct seq_file *s, void *data)
  24 {
  25         static const char *vdd_str[] = {
  26                 [8]     = "2.0",
  27                 [9]     = "2.1",
  28                 [10]    = "2.2",
  29                 [11]    = "2.3",
  30                 [12]    = "2.4",
  31                 [13]    = "2.5",
  32                 [14]    = "2.6",
  33                 [15]    = "2.7",
  34                 [16]    = "2.8",
  35                 [17]    = "2.9",
  36                 [18]    = "3.0",
  37                 [19]    = "3.1",
  38                 [20]    = "3.2",
  39                 [21]    = "3.3",
  40                 [22]    = "3.4",
  41                 [23]    = "3.5",
  42                 [24]    = "3.6",
  43         };
  44         struct mmc_host *host = s->private;
  45         struct mmc_ios  *ios = &host->ios;
  46         const char *str;
  47
  48         seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
  49         seq_printf(s, "vdd:\t\t%u ", ios->vdd);
  50         if ((1 << ios->vdd) & MMC_VDD_165_195)
  51                 seq_printf(s, "(1.65 - 1.95 V)\n");
  52         else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
  53                         && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
  54                 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
  55                                 vdd_str[ios->vdd + 1]);
  56         else
  57                 seq_printf(s, "(invalid)\n");
  58
  59         switch (ios->bus_mode) {
  60         case MMC_BUSMODE_OPENDRAIN:
  61                 str = "open drain";
  62                 break;
  63         case MMC_BUSMODE_PUSHPULL:
  64                 str = "push-pull";
  65                 break;
  66         default:
  67                 str = "invalid";
  68                 break;
  69         }
  70         seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
  71
  72         switch (ios->chip_select) {
  73         case MMC_CS_DONTCARE:
  74                 str = "don't care";
  75                 break;
  76         case MMC_CS_HIGH:
  77                 str = "active high";
  78                 break;
  79         case MMC_CS_LOW:
  80                 str = "active low";
  81                 break;
  82         default:
  83                 str = "invalid";
  84                 break;
  85         }
  86         seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
  87
  88         switch (ios->power_mode) {
  89         case MMC_POWER_OFF:
  90                 str = "off";
  91                 break;
  92         case MMC_POWER_UP:
  93                 str = "up";
  94                 break;
  95         case MMC_POWER_ON:
  96                 str = "on";
  97                 break;
  98         default:
  99                 str = "invalid";
 100                 break;
 101         }
 102         seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
 103         seq_printf(s, "bus width:\t%u (%u bits)\n",
 104                         ios->bus_width, 1 << ios->bus_width);
 105
 106         switch (ios->timing) {
 107         case MMC_TIMING_LEGACY:
 108                 str = "legacy";
 109                 break;
 110         case MMC_TIMING_MMC_HS:
 111                 str = "mmc high-speed";
 112                 break;
 113         case MMC_TIMING_SD_HS:
 114                 str = "sd high-speed";
 115                 break;
 116         default:
 117                 str = "invalid";
 118                 break;
 119         }
 120         seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
 121
 122         return 0;
 123 }
 124
 125 static int mmc_ios_open(struct inode *inode, struct file *file)
 126 {
 127         return single_open(file, mmc_ios_show, inode->i_private);
 128 }
 129
 130 static const struct file_operations mmc_ios_fops = {
 131         .open           = mmc_ios_open,
 132         .read           = seq_read,
 133         .llseek         = seq_lseek,
 134         .release        = single_release,
 135 };
 136
 137 void mmc_add_host_debugfs(struct mmc_host *host)
 138 {
 139         struct dentry *root;
 140
 141         root = debugfs_create_dir(mmc_hostname(host), NULL);
 142         if (IS_ERR(root))
 143                 /* Don't complain -- debugfs just isn't enabled */
 144                 return;
 145         if (!root)
 146                 /* Complain -- debugfs is enabled, but it failed to
 147                  * create the directory. */
 148                 goto err_root;
 149
 150         host->debugfs_root = root;
 151
 152         if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
 153                 goto err_ios;
 154
 155         return;
 156
 157 err_ios:
 158         debugfs_remove_recursive(root);
 159         host->debugfs_root = NULL;
 160 err_root:
 161         dev_err(&host->class_dev, "failed to initialize debugfs\n");
 162 }
 163
 164 void mmc_remove_host_debugfs(struct mmc_host *host)
 165 {
 166         debugfs_remove_recursive(host->debugfs_root);
 167 }
 168
 169 static int mmc_dbg_card_status_get(void *data, u64 *val)
 170 {
 171         struct mmc_card *card = data;
 172         u32             status;
 173         int             ret;
 174
 175         mmc_claim_host(card->host);
 176
 177         ret = mmc_send_status(data, &status);
 178         if (!ret)
 179                 *val = status;
 180
 181         mmc_release_host(card->host);
 182
 183         return ret;
 184 }
 185 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
 186                 NULL, "%08llx\n");
 187
 188 #define EXT_CSD_STR_LEN 1025
 189
 190 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
 191 {
 192         struct mmc_card *card = inode->i_private;
 193         char *buf;
 194         ssize_t n = 0;
 195         u8 *ext_csd;
 196         int err, i;
 197
 198         buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
 199         if (!buf)
 200                 return -ENOMEM;
 201
 202         ext_csd = kmalloc(512, GFP_KERNEL);
 203         if (!ext_csd) {
 204                 err = -ENOMEM;
 205                 goto out_free;
 206         }
 207
 208         mmc_claim_host(card->host);
 209         err = mmc_send_ext_csd(card, ext_csd);
 210         mmc_release_host(card->host);
 211         if (err)
 212                 goto out_free;
 213
 214         for (i = 511; i >= 0; i--)
 215                 n += sprintf(buf + n, "%02x", ext_csd[i]);
 216         n += sprintf(buf + n, "\n");
 217         BUG_ON(n != EXT_CSD_STR_LEN);
 218
 219         filp->private_data = buf;
 220         kfree(ext_csd);
 221         return 0;
 222
 223 out_free:
 224         kfree(buf);
 225         kfree(ext_csd);
 226         return err;
 227 }
 228
 229 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
 230                                 size_t cnt, loff_t *ppos)
 231 {
 232         char *buf = filp->private_data;
 233
 234         return simple_read_from_buffer(ubuf, cnt, ppos,
 235                                        buf, EXT_CSD_STR_LEN);
 236 }
 237
 238 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
 239 {
 240         kfree(file->private_data);
 241         return 0;
 242 }
 243
 244 static const struct file_operations mmc_dbg_ext_csd_fops = {
 245         .open           = mmc_ext_csd_open,
 246         .read           = mmc_ext_csd_read,
 247         .release        = mmc_ext_csd_release,
 248 };
 249
 250 void mmc_add_card_debugfs(struct mmc_card *card)
 251 {
 252         struct mmc_host *host = card->host;
 253         struct dentry   *root;
 254
 255         if (!host->debugfs_root)
 256                 return;
 257
 258         root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
 259         if (IS_ERR(root))
 260                 /* Don't complain -- debugfs just isn't enabled */
 261                 return;
 262         if (!root)
 263                 /* Complain -- debugfs is enabled, but it failed to
 264                  * create the directory. */
 265                 goto err;
 266
 267         card->debugfs_root = root;
 268
 269         if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
 270                 goto err;
 271
 272         if (mmc_card_mmc(card) || mmc_card_sd(card))
 273                 if (!debugfs_create_file("status", S_IRUSR, root, card,
 274                                         &mmc_dbg_card_status_fops))
 275                         goto err;
 276
 277         if (mmc_card_mmc(card))
 278                 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
 279                                         &mmc_dbg_ext_csd_fops))
 280                         goto err;
 281
 282         return;
 283
 284 err:
 285         debugfs_remove_recursive(root);
 286         card->debugfs_root = NULL;
 287         dev_err(&card->dev, "failed to initialize debugfs\n");
 288 }
 289
 290 void mmc_remove_card_debugfs(struct mmc_card *card)
 291 {
 292         debugfs_remove_recursive(card->debugfs_root);
 293 }