selphy_print/shinko_s2145_print.c

/*
 *   Shinko/Sinfonia CHC-S2145 CUPS backend -- libusb-1.0 version
 *
 *   (c) 2013 Solomon Peachy <pizza@shaftnet.org>
 *
 *   Development of this backend was sponsored by:
 * 
 *     LiveLink Technology [ www.livelinktechnology.net ]
 * 
 *   The latest version of this program can be found at:
 *
 *     http://git.shaftnet.org/git/gitweb.cgi?p=selphy_print.git
 *
 *   This program is free software; you can redistribute it and/or modify it
 *   under the terms of the GNU General Public License as published by the Free
 *   Software Foundation; either version 3 of the License, or (at your option)
 *   any later version.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *   for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *          [http://www.gnu.org/licenses/gpl-3.0.html]
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>

#define VERSION "0.16"
#define URI_PREFIX "shinkos2145://"

#include "backend_common.c"

enum {
	S_IDLE = 0,
	S_PRINTER_READY_CMD,
	S_PRINTER_SENT_DATA,
	S_FINISHED,
};

/* Structure of printjob header.  All fields are LITTLE ENDIAN */
struct s2145_printjob_hdr {
	uint32_t len1;   /* Fixed at 0x10 */
	uint32_t model;  /* Fixed at '2145' (decimal) */
	uint32_t unk2;
	uint32_t unk3;

	uint32_t len2;   /* Fixed at 0x64 */
	uint32_t unk5;
	uint32_t media;
	uint32_t unk6;

	uint32_t method;
	uint32_t mode;
	uint32_t unk7;
	uint32_t unk8;

	uint32_t unk9;
	uint32_t columns;
	uint32_t rows;
	uint32_t copies;

	uint32_t unk10;
	uint32_t unk11;
	uint32_t unk12;
	uint32_t unk13;

	uint32_t unk14;
	uint32_t unk15;
	uint32_t dpi; /* Fixed at '300' (decimal) */
	uint32_t unk16;

	uint32_t unk17;
	uint32_t unk18;
	uint32_t unk19;
	uint32_t unk20;

	uint32_t unk21;
} __attribute__((packed));

/* Structs for printer */
struct s2145_cmd_hdr {
	uint16_t cmd;
	uint16_t len;  /* Not including this header */
} __attribute__((packed));

#define S2145_CMD_STATUS    0x0001
#define S2145_CMD_MEDIAINFO 0x0002
#define S2145_CMD_MODELNAME 0x0003
#define S2145_CMD_ERRORLOG  0x0004
#define S2145_CMD_PRINTJOB  0x4001
#define S2145_CMD_CANCELJOB 0x4002
#define S2145_CMD_FLASHLED  0x4003
#define S2145_CMD_RESET     0x4004
#define S2145_CMD_READTONE  0x4005
#define S2145_CMD_BUTTON    0x4006
#define S2145_CMD_GETUNIQUE 0x8003
#define S2145_CMD_FWINFO    0xC003
#define S2145_CMD_UPDATE    0xC004
#define S2145_CMD_SETUNIQUE 0xC007

static char *cmd_names(uint16_t v) {
	switch (le16_to_cpu(v)) {
	case S2145_CMD_STATUS:
		return "Get Status";
	case S2145_CMD_MEDIAINFO:
		return "Get Media Info";
	case S2145_CMD_MODELNAME:
		return "Get Model Name";
	case S2145_CMD_ERRORLOG:
		return "Get Error Log";
	case S2145_CMD_PRINTJOB:
		return "Print";
	case S2145_CMD_CANCELJOB:
		return "Cancel Print";
	case S2145_CMD_FLASHLED:
		return "Flash LEDs";
	case S2145_CMD_RESET:
		return "Reset";
	case S2145_CMD_READTONE:
		return "Read Tone Curve";
	case S2145_CMD_BUTTON:
		return "Button Enable";
	case S2145_CMD_GETUNIQUE:
		return "Get Unique String";
	case S2145_CMD_FWINFO:
		return "Get Firmware Info";
	case S2145_CMD_UPDATE:
		return "Update";
	case S2145_CMD_SETUNIQUE:
		return "Set Unique String";
	default:
		return "Unknown Command";
	}
};

struct s2145_print_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  id;
	uint16_t count;
	uint16_t columns;
	uint16_t rows;
	uint8_t  media;
	uint8_t  mode;
	uint8_t  method;
} __attribute__((packed));

#define PRINT_MEDIA_4x6    0x00
#define PRINT_MEDIA_5x3_5  0x01
#define PRINT_MEDIA_5x7    0x03
#define PRINT_MEDIA_6x9    0x05
#define PRINT_MEDIA_6x8    0x06
#define PRINT_MEDIA_2x6    0x07

static char *print_medias (uint8_t v) {
	switch (v) {
	case PRINT_MEDIA_4x6:
		return "4x6";
	case PRINT_MEDIA_5x3_5:
		return "5x3.5";
	case PRINT_MEDIA_5x7:
		return "5x7";
	case PRINT_MEDIA_6x9:
		return "6x9";
	case PRINT_MEDIA_6x8:
		return "6x8";
	case PRINT_MEDIA_2x6:
		return "2x6";
	default:
		return "Unknown";
	}
}

#define PRINT_MODE_DEFAULT      0x01
#define PRINT_MODE_STD_GLOSSY   0x02
#define PRINT_MODE_FINE_GLOSSY  0x03
#define PRINT_MODE_STD_MATTE    0x04
#define PRINT_MODE_FINE_MATTE   0x05
#define PRINT_MODE_STD_EGLOSSY  0x06
#define PRINT_MODE_FINE_EGLOSSY 0x07

static char *print_modes(uint8_t v) {
	switch (v) {
	case PRINT_MODE_DEFAULT:
		return "Default";
	case PRINT_MODE_STD_GLOSSY:
		return "Std Glossy";
	case PRINT_MODE_FINE_GLOSSY:
		return "Fine Glossy";
	case PRINT_MODE_STD_MATTE:
		return "Std Matte";
	case PRINT_MODE_FINE_MATTE:
		return "Fine Matte";
	case PRINT_MODE_STD_EGLOSSY:
		return "Std ExGlossy";
	case PRINT_MODE_FINE_EGLOSSY:
		return "Fine ExGlossy";
	default:
		return "Unknown";
	}
}

#define PRINT_METHOD_STD     0x00
#define PRINT_METHOD_4x6_2UP 0x02
#define PRINT_METHOD_2x6_2UP 0x04

static char *print_methods (uint8_t v) { 
	switch (v) {
	case PRINT_METHOD_STD:
		return "Standard";
	case PRINT_METHOD_4x6_2UP:
		return "4x6 2up";
	case PRINT_METHOD_2x6_2UP:
		return "2x6 2up";
	default:
		return "Unknown";
	}
}

struct s2145_cancel_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  id;
} __attribute__((packed));

struct s2145_reset_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  target;
} __attribute__((packed));

#define RESET_PRINTER       0x03
#define RESET_USER_CURVE    0x04

struct s2145_readtone_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  curveid;
} __attribute__((packed));

struct s2145_button_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  enabled;
} __attribute__((packed));

#define BUTTON_ENABLED  0x01
#define BUTTON_DISABLED 0x00

struct s2145_fwinfo_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  target;
} __attribute__((packed));

#define FWINFO_TARGET_MAIN_BOOT 0x01
#define FWINFO_TARGET_MAIN_APP  0x02
#define FWINFO_TARGET_DSP_BOOT  0x03
#define FWINFO_TARGET_DSP_APP   0x04
#define FWINFO_TARGET_USB_BOOT  0x05
#define FWINFO_TARGET_USB_APP   0x06
#define FWINFO_TARGET_TABLES    0x07

static char *fwinfo_targets (uint8_t v) {
	switch (v) {
	case FWINFO_TARGET_MAIN_BOOT:
		return "Main Boot";
	case FWINFO_TARGET_MAIN_APP:
		return "Main App ";
	case FWINFO_TARGET_DSP_BOOT:
		return "DSP Boot ";
	case FWINFO_TARGET_DSP_APP:
		return "DSP App  ";
	case FWINFO_TARGET_USB_BOOT:
		return "USB Boot ";
	case FWINFO_TARGET_USB_APP:
		return "USB App  ";
	case FWINFO_TARGET_TABLES: 
		return "Tables   ";
	default:
		return "Unknown  ";
	}
}

struct s2145_update_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  target;
	uint32_t reserved;
	uint32_t size;
} __attribute__((packed));

#define UPDATE_TARGET_USER    0x03
#define UPDATE_TARGET_CURRENT 0x04

static char *update_targets (uint8_t v) {
	switch (v) {
	case UPDATE_TARGET_USER:
		return "User";
	case UPDATE_TARGET_CURRENT:
		return "Current";
	default:
		return "Unknown";
	}
}

#define UPDATE_SIZE 0x600
/* Update is three channels, Y, M, C;
   each is 256 entries of 11-bit data padded to 16-bits.
   Printer expects LE data.  We use BE data on disk.
*/

struct s2145_setunique_cmd {
	struct s2145_cmd_hdr hdr;
	uint8_t  len;
	uint8_t  data[23];  /* Not necessarily all used. */
} __attribute__((packed));

struct s2145_status_hdr {
	uint8_t  result;
	uint8_t  error;
	uint8_t  printer_major;
	uint8_t  printer_minor;
	uint8_t  reserved[3];
	uint8_t  status;
	uint16_t payload_len;
} __attribute__((packed));

#define RESULT_SUCCESS 0x01
#define RESULT_FAIL    0x02

#define ERROR_NONE              0x00
#define ERROR_INVALID_PARAM     0x01
#define ERROR_MAIN_APP_INACTIVE 0x02
#define ERROR_COMMS_TIMEOUT     0x03
#define ERROR_MAINT_NEEDED      0x04
#define ERROR_BAD_COMMAND       0x05
#define ERROR_PRINTER           0x11
#define ERROR_BUFFER_FULL       0x21

static char *error_str(uint8_t v) {
	switch (v) {
	case ERROR_NONE:
		return "None";
	case ERROR_INVALID_PARAM:
		return "Invalid Command Parameter";
	case ERROR_MAIN_APP_INACTIVE:
		return "Main App Inactive";
	case ERROR_COMMS_TIMEOUT:
		return "Main Communication Timeout";
	case ERROR_MAINT_NEEDED:
		return "Maintainence Needed";
	case ERROR_BAD_COMMAND:
		return "Inappropriate Command";
	case ERROR_PRINTER:
		return "Printer Error";
	case ERROR_BUFFER_FULL:
		return "Buffer Full";
	default:
		return "Unknown";
	}
}

/* XXX observed major/minor error codes:

   0x01/0x16 @ 77845  [maybe paper out?]
   0x06/0x0b @ 77822, 70053
   0x05/0x64 @ 76034
   0x05/0x61 @ 76034, 75420
   0x05/0x62 @ 76034
   0x05/0x4e @ 69824, 69820, 69781

   Unfortunately I have no idea what these refer to.

   major (0x01/5/6) may refer to above error codes or media/print modes.
   minor (0x61/62/64) may refer to equivalent status codes (see below)

 */

#define STATUS_READY            0x00
#define STATUS_INIT_CPU         0x31
#define STATUS_INIT_RIBBON      0x32
#define STATUS_INIT_PAPER       0x33
#define STATUS_THERMAL_PROTECT  0x34
#define STATUS_USING_PANEL      0x35
#define STATUS_SELF_DIAG        0x36
#define STATUS_DOWNLOADING      0x37

#define STATUS_FEEDING_PAPER    0x61
#define STATUS_PRE_HEAT         0x62
#define STATUS_PRINT_Y          0x63
#define STATUS_BACK_FEED_Y      0x64
#define STATUS_PRINT_M          0x65
#define STATUS_BACK_FEED_M      0x66
#define STATUS_PRINT_C          0x67
#define STATUS_BACK_FEED_C      0x68
#define STATUS_PRINT_OP         0x69
#define STATUS_PAPER_CUT        0x6A
#define STATUS_PAPER_EJECT      0x6B
#define STATUS_BACK_FEED_E      0x6C
#define STATUS_FINISHED         0x6D

static char *status_str(uint8_t v) {
	switch (v) {
	case STATUS_READY:
		return "Ready";
	case STATUS_INIT_CPU:
		return "Initializing CPU";
	case STATUS_INIT_RIBBON:
		return "Initializing Ribbon";
	case STATUS_INIT_PAPER:
		return "Loading Paper";
	case STATUS_THERMAL_PROTECT:
		return "Thermal Protection";
	case STATUS_USING_PANEL:
		return "Using Operation Panel";
	case STATUS_SELF_DIAG:
		return "Processing Self Diagnosis";
	case STATUS_DOWNLOADING:
		return "Processing Download";
	case STATUS_FEEDING_PAPER:
		return "Feeding Paper";
	case STATUS_PRE_HEAT:
		return "Pre-Heating";
	case STATUS_PRINT_Y:
		return "Printing Yellow";
	case STATUS_BACK_FEED_Y:
		return "Back-Feeding - Yellow Complete";
	case STATUS_PRINT_M:
		return "Printing Magenta";
	case STATUS_BACK_FEED_M:
		return "Back-Feeding - Magenta Complete";
	case STATUS_PRINT_C:
		return "Printing Cyan";
	case STATUS_BACK_FEED_C:
		return "Back-Feeding - Cyan Complete";
	case STATUS_PRINT_OP:
		return "Laminating";
	case STATUS_PAPER_CUT:
		return "Cutting Paper";
	case STATUS_PAPER_EJECT:
		return "Ejecting Paper";
	case STATUS_BACK_FEED_E:
		return "Back-Feeding - Ejected";
	case STATUS_FINISHED:
		return "Print Finished";
	default:
		return "Unknown";
	}
}

struct s2145_status_resp {
	struct s2145_status_hdr hdr;
	uint32_t count_lifetime;
	uint32_t count_maint;
	uint32_t count_paper;
	uint32_t count_cutter;
	uint32_t count_head;
	uint32_t count_ribbon_left;
	uint8_t  bank1_printid;
	uint8_t  bank2_printid;
	uint16_t bank1_remaining;
	uint16_t bank1_finished;
	uint16_t bank1_specified;
	uint8_t  bank1_status;
	uint16_t bank2_remaining;
	uint16_t bank2_finished;
	uint16_t bank2_specified;
	uint8_t  bank2_status;
	uint8_t  tonecurve_status;
} __attribute__((packed));

#define BANK_STATUS_FREE  0x00
#define BANK_STATUS_XFER  0x01
#define BANK_STATUS_FULL  0x02

static char *bank_statuses(uint8_t v)
{
	switch (v) {
	case 0:
		return "Free";
	case 1:
		return "Xfer";
	case 2:
		return "Full";
	default:
		return "Unknown";
	}
}

#define TONECURVE_INIT    0x00
#define TONECURVE_USER    0x01
#define TONECURVE_CURRENT 0x02

static char *tonecurve_statuses (uint8_t v)
{
	switch(v) {
	case 0:
		return "Initial";
	case 1:
		return "UserSet";
	case 2:
		return "Current";
	default:
		return "Unknown";
	}
}

struct s2145_readtone_resp {
	struct s2145_status_hdr hdr;
	uint16_t total_size;
} __attribute__((packed));

struct s2145_mediainfo_item {
	uint8_t  code;
	uint16_t columns;
	uint16_t rows;
	uint8_t  media_type;
	uint8_t  print_type;
	uint8_t  reserved[3];
} __attribute__((packed));

#define MEDIA_TYPE_UNKNOWN 0x00
#define MEDIA_TYPE_PAPER   0x01

static char *media_types(uint8_t v) {
	switch (v) {
	case MEDIA_TYPE_UNKNOWN:
		return "Unknown";
	case MEDIA_TYPE_PAPER:
		return "Paper";
	default:
		return "Unknown";
	}
}

struct s2145_mediainfo_resp {
	struct s2145_status_hdr hdr;
	uint8_t  count;
	struct s2145_mediainfo_item items[10];  /* Not all necessarily used */
} __attribute__((packed));

struct s2145_modelname_resp {
	struct s2145_status_hdr hdr;
	uint8_t vendor[4];
	uint8_t product[4];
	uint8_t modelname[40];
} __attribute__((packed));

struct s2145_error_item {
	uint8_t  major;
	uint8_t  minor;
	uint32_t print_counter;
} __attribute__((packed));

struct s2145_errorlog_resp {
	struct s2145_status_hdr hdr;
	uint8_t  count;
	struct s2145_error_item items[10];  /* Not all necessarily used */
} __attribute__((packed));

struct s2145_fwinfo_resp {
	struct s2145_status_hdr hdr;
	uint8_t  name[8];
	uint8_t  type[16];
	uint8_t  date[10];
	uint8_t  major;
	uint8_t  minor;
	uint16_t checksum;
} __attribute__((packed));

struct s2145_getunique_resp {
	struct s2145_status_hdr hdr;
	uint8_t  data[24];  /* Not necessarily all used. */
} __attribute__((packed));

#define READBACK_LEN 128    /* Needs to be larger than largest response hdr */
#define CMDBUF_LEN sizeof(struct s2145_print_cmd)

uint8_t rdbuf[READBACK_LEN];

static int s2145_do_cmd(libusb_device_handle *dev, 
			uint8_t endp_up, uint8_t endp_down,
			uint8_t *cmd, int cmdlen, int minlen, int *num)
{
	int ret;
	struct s2145_status_hdr *resp = (struct s2145_status_hdr *) rdbuf;

	if ((ret = send_data(dev, endp_down,
			     cmd, cmdlen)))
		return -99;

	ret = libusb_bulk_transfer(dev, endp_up,
				   rdbuf,
				   READBACK_LEN,
				   num,
				   5000);

	if (ret < 0 || (*num < minlen)) {
		ERROR("Failure to receive data from printer (libusb error %d: (%d/%d from 0x%02x))\n", ret, *num, minlen, endp_up);
		return ret;
	}

	if (resp->result != RESULT_SUCCESS) {
		INFO("Printer Status:  %02x (%s)\n", resp->status, 
		     status_str(resp->status));
		INFO(" Result: 0x%02x  Error: 0x%02x (0x%02x/0x%02x)\n",
		     resp->result, resp->error, resp->printer_major,
		     resp->printer_minor);
		return -99;
	}

	return ret;
}

static int get_status(libusb_device_handle *dev, 
		      uint8_t endp_down, uint8_t endp_up) 
{
	struct s2145_cmd_hdr cmd;
	struct s2145_status_resp *resp = (struct s2145_status_resp *) rdbuf;
	int ret, num = 0;

	cmd.cmd = cpu_to_le16(S2145_CMD_STATUS);
	cmd.len = cpu_to_le16(0);

	if ((ret = s2145_do_cmd(dev, endp_up, endp_down, 
				(uint8_t*)&cmd, sizeof(cmd),
				sizeof(*resp),
				&num)) < 0) {
		ERROR("Failed to execute %s command\n", cmd_names(cmd.cmd));
		return -1;
	}

	INFO("Printer Status:  0x%02x (%s)\n", resp->hdr.status,
	     status_str(resp->hdr.status));

	if (le16_to_cpu(resp->hdr.payload_len) != (sizeof(struct s2145_status_resp) - sizeof(struct s2145_status_hdr)))
		return 0;

	INFO(" Print Counts:\n");
	INFO("\tSince Paper Changed:\t%08d\n", le32_to_cpu(resp->count_paper));
	INFO("\tLifetime:\t\t%08d\n", le32_to_cpu(resp->count_lifetime));
	INFO("\tMaintainence:\t\t%08d\n", le32_to_cpu(resp->count_maint));
	INFO("\tPrint Head:\t\t%08d\n", le32_to_cpu(resp->count_head));
	INFO(" Cutter Actuations:\t%08d\n", le32_to_cpu(resp->count_cutter));
	INFO(" Ribbon Remaining:\t%08d\n", le32_to_cpu(resp->count_ribbon_left));
	INFO("Bank 1: 0x%02x (%s) Job %03d @ %03d/%03d (%03d remaining)\n",
	     resp->bank1_status, bank_statuses(resp->bank1_status),
	     resp->bank1_printid,
	     le16_to_cpu(resp->bank1_finished),
	     le16_to_cpu(resp->bank1_specified),
	     le16_to_cpu(resp->bank1_remaining));

	INFO("Bank 2: 0x%02x (%s) Job %03d @ %03d/%03d (%03d remaining)\n",
	     resp->bank2_status, bank_statuses(resp->bank1_status),
	     resp->bank2_printid,
	     le16_to_cpu(resp->bank2_finished),
	     le16_to_cpu(resp->bank2_specified),
	     le16_to_cpu(resp->bank2_remaining));

	INFO("Tonecurve Status: 0x%02x (%s)\n", resp->tonecurve_status, tonecurve_statuses(resp->tonecurve_status));

	return 0;
}

static int get_fwinfo(libusb_device_handle *dev, 
		      uint8_t endp_down, uint8_t endp_up) 
{
	struct s2145_fwinfo_cmd  cmd;
	struct s2145_fwinfo_resp *resp = (struct s2145_fwinfo_resp *)rdbuf;
	int ret, num = 0;
	int i;

	cmd.hdr.cmd = cpu_to_le16(S2145_CMD_FWINFO);
	cmd.hdr.len = cpu_to_le16(1);

	INFO("FW Information:\n");

	for (i = FWINFO_TARGET_MAIN_BOOT ; i <= FWINFO_TARGET_TABLES ; i++) {
		cmd.target = i;

		if ((ret = s2145_do_cmd(dev, endp_up, endp_down, 
					(uint8_t*)&cmd, sizeof(cmd),
					sizeof(*resp),
					&num)) < 0) {
			ERROR("Failed to execute %s command\n", cmd_names(cmd.hdr.cmd));
			continue;
		}

		if (le16_to_cpu(resp->hdr.payload_len) != (sizeof(struct s2145_fwinfo_resp) - sizeof(struct s2145_status_hdr)))
			continue;
		
		INFO(" %s\t ver %02x.%02x\n", fwinfo_targets(i),
		     resp->major, resp->minor);
#if 0
		INFO("  name:    '%s'\n", resp->name);
		INFO("  type:    '%s'\n", resp->type);
		INFO("  date:    '%s'\n", resp->date);
		INFO("  version: %02x.%02x (CRC %04x)\n", resp->major, resp->minor,
		     le16_to_cpu(resp->checksum));
#endif
	}
	return 0;
}

static int get_errorlog(libusb_device_handle *dev, 
			uint8_t endp_down, uint8_t endp_up) 
{
	struct s2145_cmd_hdr cmd;
	struct s2145_errorlog_resp *resp = (struct s2145_errorlog_resp *) rdbuf;
	int ret, num = 0;
	int i;

	cmd.cmd = cpu_to_le16(S2145_CMD_ERRORLOG);
	cmd.len = cpu_to_le16(0);

	if ((ret = s2145_do_cmd(dev, endp_up, endp_down, 
				(uint8_t*)&cmd, sizeof(cmd),
				sizeof(*resp),
				&num)) < 0) {
		ERROR("Failed to execute %s command\n", cmd_names(cmd.cmd));
		return -1;
	}
	
	if (le16_to_cpu(resp->hdr.payload_len) != (sizeof(struct s2145_errorlog_resp) - sizeof(struct s2145_status_hdr)))
		return -2;

	INFO("Stored Error Events: %d entries:\n", resp->count);
	for (i = 0 ; i < resp->count ; i++) {
		INFO(" %02d: 0x%02x/0x%02x @ %08d prints\n", i,
		     resp->items[i].major, resp->items[i].minor, 
		     le32_to_cpu(resp->items[i].print_counter));
	}
	return 0;
}

static int get_mediainfo(libusb_device_handle *dev, 
			 uint8_t endp_down, uint8_t endp_up) 
{
	struct s2145_cmd_hdr cmd;
	struct s2145_mediainfo_resp *resp = (struct s2145_mediainfo_resp *) rdbuf;
	int ret, num = 0;
	int i;

	cmd.cmd = cpu_to_le16(S2145_CMD_MEDIAINFO);
	cmd.len = cpu_to_le16(0);

	if ((ret = s2145_do_cmd(dev, endp_up, endp_down, 
				(uint8_t*)&cmd, sizeof(cmd),
				sizeof(*resp),
				&num)) < 0) {
		ERROR("Failed to execute %s command\n", cmd_names(cmd.cmd));
		return -1;
	}
	
	if (le16_to_cpu(resp->hdr.payload_len) != (sizeof(struct s2145_mediainfo_resp) - sizeof(struct s2145_status_hdr)))
		return -2;

	INFO("Supported Media Information: %d entries:\n", resp->count);
	for (i = 0 ; i < resp->count ; i++) {
		INFO(" %02d: C 0x%02x (%s), %04dx%04d, M 0x%02x (%s), P 0x%02x (%s)\n", i,
		     resp->items[i].code, print_medias(resp->items[i].code),
		     le16_to_cpu(resp->items[i].columns),
		     le16_to_cpu(resp->items[i].rows), 
		     resp->items[i].media_type, media_types(resp->items[i].media_type),
		     resp->items[i].print_type, print_methods(resp->items[i].print_type));
	}
	return 0;
}

static int get_user_string(libusb_device_handle *dev, 
			   uint8_t endp_down, uint8_t endp_up) 
{
	struct s2145_cmd_hdr cmd;
	struct s2145_getunique_resp *resp = (struct s2145_getunique_resp*) rdbuf;
	int ret, num = 0;

	cmd.cmd = cpu_to_le16(S2145_CMD_GETUNIQUE);
	cmd.len = cpu_to_le16(0);

	if ((ret = s2145_do_cmd(dev, endp_up, endp_down, 
				(uint8_t*)&cmd, sizeof(cmd),
				sizeof(*resp) - 1,
				&num)) < 0) {
		ERROR("Failed to execute %s command\n", cmd_names(cmd.cmd));
		return -1;
	}

	/* Null-terminate */
	resp->hdr.payload_len = le16_to_cpu(resp->hdr.payload_len);
	if (resp->hdr.payload_len > 23)
		resp->hdr.payload_len = 23;
	resp->data[resp->hdr.payload_len] = 0;
	INFO("Unique String: '%s'\n", resp->data);
	return 0;
}

static int set_user_string(char *str, libusb_device_handle *dev, 
			   uint8_t endp_down, uint8_t endp_up) 
{
	struct s2145_setunique_cmd cmd;
	struct s2145_status_hdr *resp = (struct s2145_status_hdr *) rdbuf;
	int ret, num = 0;

	if (str) {
		cmd.len = strlen(str);
		if (cmd.len > 23)
			cmd.len = 23;
		memset(cmd.data, 0, sizeof(cmd.data));
		strncpy((char*)cmd.data, str, cmd.len);
	} else {
		cmd.len = 0;
	}

	cmd.hdr.cmd = cpu_to_le16(S2145_CMD_SETUNIQUE);
	cmd.hdr.len = cpu_to_le16(cmd.len + 1);

	if ((ret = s2145_do_cmd(dev, endp_up, endp_down, 
				(uint8_t*)&cmd, cmd.len + 1 + sizeof(cmd.hdr),
				sizeof(*resp),
				&num)) < 0) {