Matteo Croce submitted a hdparm applet.

include/usage.h

@@ -805,6 +805,81 @@
 #define halt_full_usage \
 	"Halt the system."
 
+#ifdef CONFIG_FEATURE_HDPARM_GET_IDENTITY
+#define USAGE_HDPARM_IDENT(a) a
+#else
+#define USAGE_HDPARM_IDENT(a)
+#endif
+
+#ifdef CONFIG_FEATURE_HDPARM_HDIO_SCAN_HWIF
+#define USAGE_SCAN_HWIF(a) a
+#else
+#define USAGE_SCAN_HWIF(a)
+#endif
+
+#ifdef CONFIG_FEATURE_HDPARM_HDIO_UNREGISTER_HWIF
+#define USAGE_UNREGISTER_HWIF(a) a
+#else
+#define USAGE_UNREGISTER_HWIF(a)
+#endif
+
+#ifdef CONFIG_FEATURE_HDPARM_HDIO_DRIVE_RESET
+#define USAGE_DRIVE_RESET(a) a
+#else
+#define USAGE_DRIVE_RESET(a)
+#endif
+
+#ifdef CONFIG_FEATURE_HDPARM_HDIO_TRISTATE_HWIF
+#define USAGE_TRISTATE_HWIF(a) a
+#else
+#define USAGE_TRISTATE_HWIF(a)
+#endif
+
+#define hdparm_trivial_usage \
+	"[options] [device] .."
+#define hdparm_full_usage \
+	"Options:" \
+	" -a   get/set fs readahead\n" \
+	" -A   set drive read-lookahead flag (0/1)\n" \
+	" -b   get/set bus state (0 == off, 1 == on, 2 == tristate)\n" \
+	" -B   set Advanced Power Management setting (1-255)\n" \
+	" -c   get/set IDE 32-bit IO setting\n" \
+	" -C   check IDE power mode status\n" \
+	" -d   get/set using_dma flag\n" \
+	" -D   enable/disable drive defect-mgmt\n" \
+	" -f   flush buffer cache for device on exit\n" \
+	" -g   display drive geometry\n" \
+	" -h   display terse usage information\n" \
+	" -i   display drive identification\n" \
+	USAGE_HDPARM_IDENT(" -I   detailed/current information directly from drive\n") \
+	USAGE_HDPARM_IDENT(" -Istdin  similar to -I, but wants /proc/ide/" "*" "/hd?/identify as input\n") \
+	" -k   get/set keep_settings_over_reset flag (0/1)\n" \
+	" -K   set drive keep_features_over_reset flag (0/1)\n" \
+	" -L   set drive doorlock (0/1) (removable harddisks only)\n" \
+	" -m   get/set multiple sector count\n" \
+	" -n   get/set ignore-write-errors flag (0/1)\n" \
+	" -p   set PIO mode on IDE interface chipset (0,1,2,3,4,...)\n" \
+	" -P   set drive prefetch count\n" \
+	" -q   change next setting quietly\n" \
+	" -Q   get/set DMA tagged-queuing depth (if supported)\n" \
+	" -r   get/set readonly flag (DANGEROUS to set)\n" \
+	USAGE_SCAN_HWIF(" -R   register an IDE interface (DANGEROUS)\n") \
+	" -S   set standby (spindown) timeout\n" \
+	" -t   perform device read timings\n" \
+	" -T   perform cache read timings\n" \
+	" -u   get/set unmaskirq flag (0/1)\n" \
+	USAGE_UNREGISTER_HWIF(" -U   un-register an IDE interface (DANGEROUS)\n") \
+	" -v   defaults; same as -mcudkrag for IDE drives\n" \
+	" -V   display program version and exit immediately\n" \
+	USAGE_DRIVE_RESET(" -w   perform device reset (DANGEROUS)\n") \
+	" -W   set drive write-caching flag (0/1) (DANGEROUS)\n" \
+	USAGE_TRISTATE_HWIF(" -x   tristate device for hotswap (0/1) (DANGEROUS)\n") \
+	" -X   set IDE xfer mode (DANGEROUS)\n" \
+	" -y   put IDE drive in standby mode\n" \
+	" -Y   put IDE drive to sleep\n" \
+	" -Z   disable Seagate auto-powersaving mode\n" \
+	" -z   re-read partition table\n"
+
 #ifdef CONFIG_FEATURE_FANCY_HEAD
 #define USAGE_FANCY_HEAD(a) a
 #else