[PATCH 1/1] Add support for SD/MMC storage cards on Linux

[Harald Welte]

This patch adds a new SDMMC device type to represent SD/MMC
cards.  There is nothing special about handling those devices,
they are just standard block devices with different names.

They use device major ID 179 and are usually called
/dev/mmcblkN (where N is the card number) and the individual partitions
/dev/mmcblkNpM (where M is the partition number).

This patch was developed as part of an effort to make debian-installer
support installation of Debian GNU/Linux on SD/MMC cards, as boot-from-SD
is becoming a feature seen in mobile x86 devices.
---
 AUTHORS                 |    3 +++
 include/parted/device.h |    3 ++-
 libparted/arch/linux.c  |   36 ++++++++++++++++++++++++++++++++++++
 parted/parted.c         |    4 ++--
 4 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/AUTHORS b/AUTHORS
index e955e6f..568e019 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -231,3 +231,6 @@ Debarshi Ray            <address@hidden>
         * Introduce 'print devices' and alias 'print list' to 'print all'.
         * Alias 'mktable' to 'mklabel'.
         * Code and API clean-up, bug fixes, and other miscellaneous stuff.
+
+Harald Welte            <address@hidden>
+        * SD/MMC Storage card support on Linux
diff --git a/include/parted/device.h b/include/parted/device.h
index fdfcb1f..2a3421f 100644
--- a/include/parted/device.h
+++ b/include/parted/device.h
@@ -44,7 +44,8 @@ typedef enum {
         PED_DEVICE_VIODASD      = 10,
         PED_DEVICE_SX8          = 11,
         PED_DEVICE_DM           = 12,
-        PED_DEVICE_XVD          = 13
+        PED_DEVICE_XVD          = 13,
+        PED_DEVICE_SDMMC        = 14
 } PedDeviceType;
 
 typedef struct _PedDevice PedDevice;
diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
index 333f818..83e24c8 100644
--- a/libparted/arch/linux.c
+++ b/libparted/arch/linux.c
@@ -255,6 +255,7 @@ struct blkdev_ioctl_param {
 #define SX8_MAJOR1              160
 #define SX8_MAJOR2              161
 #define XVD_MAJOR               202
+#define SDMMC_MAJOR             179
 
 #define SCSI_BLK_MAJOR(M) (                                             \
                 (M) == SCSI_DISK0_MAJOR                                 \
@@ -537,6 +538,8 @@ _device_probe_type (PedDevice* dev)
 #endif
         } else if (dev_major == XVD_MAJOR && (dev_minor % 0x10 == 0)) {
                 dev->type = PED_DEVICE_XVD;
+        } else if (dev_major == SDMMC_MAJOR && (dev_minor % 0x08 == 0)) {
+                dev->type = PED_DEVICE_SDMMC;
         } else {
                 dev->type = PED_DEVICE_UNKNOWN;
         }
@@ -1147,6 +1150,34 @@ error:
         return 0;
 }
 
+static int
+sdmmc_get_product_info (PedDevice* dev, char **type, char **name)
+{
+        *type = read_device_sysfs_file (dev, "type");
+        *name = read_device_sysfs_file (dev, "name");
+        if (*type && *name)
+                return 1;
+
+        return 0;
+}
+
+static int
+init_sdmmc (PedDevice* dev)
+{
+        char id[128];
+        char *type, *name;
+
+        if (sdmmc_get_product_info (dev, &type, &name)) {
+                snprintf (id, sizeof(id) - 1, "%s %s", type, name);
+                free (type);
+                free (name);
+        } else {
+                snprintf (id, sizeof(id) - 1, "%s",
+                          _("Generic SD/MMC Storage Card"));
+        }
+        return init_generic(dev, id);
+}
+
 static PedDevice*
 linux_new (const char* path)
 {
@@ -1259,6 +1290,11 @@ linux_new (const char* path)
                         goto error_free_arch_specific;
                 break;
 
+        case PED_DEVICE_SDMMC:
+                if (!init_sdmmc (dev))
+                        goto error_free_arch_specific;
+                break;
+
         default:
                 ped_exception_throw (PED_EXCEPTION_NO_FEATURE,
                                 PED_EXCEPTION_CANCEL,
diff --git a/parted/parted.c b/parted/parted.c
index 5e67584..d7c0292 100644
--- a/parted/parted.c
+++ b/parted/parted.c
@@ -1268,10 +1268,10 @@ do_print (PedDevice** dev)
         int             has_free_arg = 0;
         int             has_list_arg = 0;
         int             has_num_arg = 0;
-        const char *const transport[14] = {"unknown", "scsi", "ide", "dac960",
+        const char *const transport[15] = {"unknown", "scsi", "ide", "dac960",
                                           "cpqarray", "file", "ataraid", "i2o",
                                           "ubd", "dasd", "viodasd", "sx8", 
"dm",
-                                          "xvd"};
+                                          "xvd", "sd/mmc"};
         char*           peek_word;
         char*           start;
         char*           end;
-- 
1.5.6.5