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 #ifdef CONFIG_MMC_CLKGATE
 156         if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
 157                                 root, &host->clk_delay))
 158                 goto err_ios;
 159 #endif
 160         return;
 161
 162 err_ios:
 163         debugfs_remove_recursive(root);
 164         host->debugfs_root = NULL;
 165 err_root:
 166         dev_err(&host->class_dev, "failed to initialize debugfs\n");
 167 }
 168
 169 void mmc_remove_host_debugfs(struct mmc_host *host)
 170 {
 171         debugfs_remove_recursive(host->debugfs_root);
 172 }
 173
 174 static int mmc_dbg_card_status_get(void *data, u64 *val)
 175 {
 176         struct mmc_card *card = data;
 177         u32             status;
 178         int             ret;
 179
 180         mmc_claim_host(card->host);
 181
 182         ret = mmc_send_status(data, &status);
 183         if (!ret)
 184                 *val = status;
 185
 186         mmc_release_host(card->host);
 187
 188         return ret;
 189 }
 190 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
 191                 NULL, "%08llx\n");
 192
 193 #define EXT_CSD_STR_LEN 1025
 194
 195 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
 196 {
 197         struct mmc_card *card = inode->i_private;
 198         char *buf;
 199         ssize_t n = 0;
 200         u8 *ext_csd;
 201         int err, i;
 202
 203         buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
 204         if (!buf)
 205                 return -ENOMEM;
 206
 207         ext_csd = kmalloc(512, GFP_KERNEL);
 208         if (!ext_csd) {
 209                 err = -ENOMEM;
 210                 goto out_free;
 211         }
 212
 213         mmc_claim_host(card->host);
 214         err = mmc_send_ext_csd(card, ext_csd);
 215         mmc_release_host(card->host);
 216         if (err)
 217                 goto out_free;
 218
 219         for (i = 511; i >= 0; i--)
 220                 n += sprintf(buf + n, "%02x", ext_csd[i]);
 221         n += sprintf(buf + n, "\n");
 222         BUG_ON(n != EXT_CSD_STR_LEN);
 223
 224         filp->private_data = buf;
 225         kfree(ext_csd);
 226         return 0;
 227
 228 out_free:
 229         kfree(buf);
 230         kfree(ext_csd);
 231         return err;
 232 }
 233
 234 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
 235                                 size_t cnt, loff_t *ppos)
 236 {
 237         char *buf = filp->private_data;
 238
 239         return simple_read_from_buffer(ubuf, cnt, ppos,
 240                                        buf, EXT_CSD_STR_LEN);
 241 }
 242
 243 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
 244 {
 245         kfree(file->private_data);
 246         return 0;
 247 }
 248
 249 static const struct file_operations mmc_dbg_ext_csd_fops = {
 250         .open           = mmc_ext_csd_open,
 251         .read           = mmc_ext_csd_read,
 252         .release        = mmc_ext_csd_release,
 253 };
 254
 255 void mmc_add_card_debugfs(struct mmc_card *card)
 256 {
 257         struct mmc_host *host = card->host;
 258         struct dentry   *root;
 259
 260         if (!host->debugfs_root)
 261                 return;
 262
 263         root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
 264         if (IS_ERR(root))
 265                 /* Don't complain -- debugfs just isn't enabled */
 266                 return;
 267         if (!root)
 268                 /* Complain -- debugfs is enabled, but it failed to
 269                  * create the directory. */
 270                 goto err;
 271
 272         card->debugfs_root = root;
 273
 274         if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
 275                 goto err;
 276
 277         if (mmc_card_mmc(card) || mmc_card_sd(card))
 278                 if (!debugfs_create_file("status", S_IRUSR, root, card,
 279                                         &mmc_dbg_card_status_fops))
 280                         goto err;
 281
 282         if (mmc_card_mmc(card))
 283                 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
 284                                         &mmc_dbg_ext_csd_fops))
 285                         goto err;
 286
 287         return;
 288
 289 err:
 290         debugfs_remove_recursive(root);
 291         card->debugfs_root = NULL;
 292         dev_err(&card->dev, "failed to initialize debugfs\n");
 293 }
 294
 295 void mmc_remove_card_debugfs(struct mmc_card *card)
 296 {
 297         debugfs_remove_recursive(card->debugfs_root);
 298 }