https://stackoverflow.com/questions/23312933
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RussianYour driver is omap_hsmmc according to http://processors.wiki.ti.com/index.php/AM335x_MMC/SD_Driver%27s_Guide some info also in https://www.kernel.org/doc/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
After some web searching for SMART monitoring support in sd cards, I get the search query mmc smartctl (because smartctl is name of SMART monitoring utility for *ATA in Linux, and mmc is the kernel subsystem to implement MMC, SD, SDHC cards and controllers. I found the bug filled against some mobile PC OS, https://code.google.com/p/chromium/issues/detail?id=315380 by Gwendal Grignou
If the root device is a SATA device:
- Add output of hdparm -I /dev/sda
- Add output of smartctl -a /dev/sda
If the root device is a eMMC device:
- When mmc-utils will be part of the image, add a similar command output.
It sounds like the mmc-utils it the tool of choice to implement SMART for SD cards. There is home git of mmc-utils on kernel.org: http://git.kernel.org/cgit/linux/kernel/git/cjb/mmc-utils.git/tree/
I see no "SMART" here, but the mmc-utils/mmc_cmds.c has code to send custom commands to the card by using ioctl(fd, MMC_IOC_CMD, (struct mmc_ioc_cmd*) &ioctl_data) with fd pointing to correct mmcblkX device (I hope this works with most SD controllers). Code by Johan RUDHOLM (from st-ericsson, 2012, GPLv2):
int read_extcsd(int fd, __u8 *ext_csd)
{
struct mmc_ioc_cmd idata;
memset(&idata, 0, sizeof(idata));
memset(ext_csd, 0, sizeof(__u8) * 512);
idata.write_flag = 0;
idata.opcode = MMC_SEND_EXT_CSD;
idata.arg = 0;
idata.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
idata.blksz = 512;
idata.blocks = 1;
mmc_ioc_cmd_set_data(idata, ext_csd);
return ioctl(fd, MMC_IOC_CMD, &idata);
}
int write_extcsd_value(int fd, __u8 index, __u8 value)
{
struct mmc_ioc_cmd idata;
memset(&idata, 0, sizeof(idata));
idata.write_flag = 1;
idata.opcode = MMC_SWITCH;
idata.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
(index << 16) |
(value << 8) |
EXT_CSD_CMD_SET_NORMAL;
idata.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
return ioctl(fd, MMC_IOC_CMD, &idata);
}
Some documentation and examples for MMC_IOC_CMD were posted in LKML by Shashidhar Hiremath at 20 Dec 14:54 2011 "[PATCH 1/1] mmc: User Application for testing SD/MMC Commands and extra IOCTL Command for MMC card reset"
The official userAPI (uapi) for struct mmc_ioc_cmd is in linux source tree include/uapi/linux/mmc/ioctl.h:
6 struct mmc_ioc_cmd {
...
10 /* Application-specific command. true = precede with CMD55 */
11 int is_acmd;
...
51 * Since this ioctl is only meant to enhance (and not replace) normal access
52 * to the mmc bus device...
