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 static int mmc_clock_opt_get(void *data, u64 *val)
 138 {
 139         struct mmc_host *host = data;
 140
 141         *val = host->ios.clock;
 142
 143         return 0;
 144 }
 145
 146 static int mmc_clock_opt_set(void *data, u64 val)
 147 {
 148         struct mmc_host *host = data;
 149
 150         /* We need this check due to input value is u64 */
 151         if (val > host->f_max)
 152                 return -EINVAL;
 153
 154         mmc_claim_host(host);
 155         mmc_set_clock(host, (unsigned int) val);
 156         mmc_release_host(host);
 157
 158         return 0;
 159 }
 160
 161 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
 162         "%llu\n");
 163
 164 void mmc_add_host_debugfs(struct mmc_host *host)
 165 {
 166         struct dentry *root;
 167
 168         root = debugfs_create_dir(mmc_hostname(host), NULL);
 169         if (IS_ERR(root))
 170                 /* Don't complain -- debugfs just isn't enabled */
 171                 return;
 172         if (!root)
 173                 /* Complain -- debugfs is enabled, but it failed to
 174                  * create the directory. */
 175                 goto err_root;
 176
 177         host->debugfs_root = root;
 178
 179         if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
 180                 goto err_node;
 181
 182         if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
 183                         &mmc_clock_fops))
 184                 goto err_node;
 185
 186 #ifdef CONFIG_MMC_CLKGATE
 187         if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
 188                                 root, &host->clk_delay))
 189                 goto err_node;
 190 #endif
 191         return;
 192
 193 err_node:
 194         debugfs_remove_recursive(root);
 195         host->debugfs_root = NULL;
 196 err_root:
 197         dev_err(&host->class_dev, "failed to initialize debugfs\n");
 198 }
 199
 200 void mmc_remove_host_debugfs(struct mmc_host *host)
 201 {
 202         debugfs_remove_recursive(host->debugfs_root);
 203 }
 204
 205 static int mmc_dbg_card_status_get(void *data, u64 *val)
 206 {
 207         struct mmc_card *card = data;
 208         u32             status;
 209         int             ret;
 210
 211         mmc_claim_host(card->host);
 212
 213         ret = mmc_send_status(data, &status);
 214         if (!ret)
 215                 *val = status;
 216
 217         mmc_release_host(card->host);
 218
 219         return ret;
 220 }
 221 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
 222                 NULL, "%08llx\n");
 223
 224 #define EXT_CSD_STR_LEN 1025
 225
 226 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
 227 {
 228         struct mmc_card *card = inode->i_private;
 229         char *buf;
 230         ssize_t n = 0;
 231         u8 *ext_csd;
 232         int err, i;
 233
 234         buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
 235         if (!buf)
 236                 return -ENOMEM;
 237
 238         ext_csd = kmalloc(512, GFP_KERNEL);
 239         if (!ext_csd) {
 240                 err = -ENOMEM;
 241                 goto out_free;
 242         }
 243
 244         mmc_claim_host(card->host);
 245         err = mmc_send_ext_csd(card, ext_csd);
 246         mmc_release_host(card->host);
 247         if (err)
 248                 goto out_free;
 249
 250         for (i = 511; i >= 0; i--)
 251                 n += sprintf(buf + n, "%02x", ext_csd[i]);
 252         n += sprintf(buf + n, "\n");
 253         BUG_ON(n != EXT_CSD_STR_LEN);
 254
 255         filp->private_data = buf;
 256         kfree(ext_csd);
 257         return 0;
 258
 259 out_free:
 260         kfree(buf);
 261         kfree(ext_csd);
 262         return err;
 263 }
 264
 265 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
 266                                 size_t cnt, loff_t *ppos)
 267 {
 268         char *buf = filp->private_data;
 269
 270         return simple_read_from_buffer(ubuf, cnt, ppos,
 271                                        buf, EXT_CSD_STR_LEN);
 272 }
 273
 274 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
 275 {
 276         kfree(file->private_data);
 277         return 0;
 278 }
 279
 280 static const struct file_operations mmc_dbg_ext_csd_fops = {
 281         .open           = mmc_ext_csd_open,
 282         .read           = mmc_ext_csd_read,
 283         .release        = mmc_ext_csd_release,
 284         .llseek         = default_llseek,
 285 };
 286
 287 void mmc_add_card_debugfs(struct mmc_card *card)
 288 {
 289         struct mmc_host *host = card->host;
 290         struct dentry   *root;
 291
 292         if (!host->debugfs_root)
 293                 return;
 294
 295         root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
 296         if (IS_ERR(root))
 297                 /* Don't complain -- debugfs just isn't enabled */
 298                 return;
 299         if (!root)
 300                 /* Complain -- debugfs is enabled, but it failed to
 301                  * create the directory. */
 302                 goto err;
 303
 304         card->debugfs_root = root;
 305
 306         if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
 307                 goto err;
 308
 309         if (mmc_card_mmc(card) || mmc_card_sd(card))
 310                 if (!debugfs_create_file("status", S_IRUSR, root, card,
 311                                         &mmc_dbg_card_status_fops))
 312                         goto err;
 313
 314         if (mmc_card_mmc(card))
 315                 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
 316                                         &mmc_dbg_ext_csd_fops))
 317                         goto err;
 318
 319         return;
 320
 321 err:
 322         debugfs_remove_recursive(root);
 323         card->debugfs_root = NULL;
 324         dev_err(&card->dev, "failed to initialize debugfs\n");
 325 }
 326
 327 void mmc_remove_card_debugfs(struct mmc_card *card)
 328 {
 329         debugfs_remove_recursive(card->debugfs_root);
 330 }