/* this functions reads button status */
static SANE_Status
rts8891_read_buttons (SANE_Int devnum, SANE_Int * mask)
{
SANE_Status status = SANE_STATUS_GOOD;
SANE_Byte reg;
/* check CONTROL_REG */
sanei_rts88xx_read_reg (devnum, CONTROL_REG, ®);
/* read 'base' button status */
sanei_rts88xx_read_reg (devnum, 0x25, ®);
DBG (DBG_io, "rts8891_read_buttons: r25=0x%02x\n", reg);
*mask |= reg;
/* read 'extended' button status */
sanei_rts88xx_read_reg (devnum, 0x1a, ®);
DBG (DBG_io, "rts8891_read_buttons: r1a=0x%02x\n", reg);
*mask |= reg << 8;
/* clear register r25 */
reg = 0x00;
sanei_rts88xx_write_reg (devnum, 0x25, ®);
/* clear register r1a */
sanei_rts88xx_read_reg (devnum, 0x1a, ®);
reg = 0x00;
status = sanei_rts88xx_write_reg (devnum, 0x1a, ®);
DBG (DBG_info, "rts8891_read_buttons: mask=0x%04x\n", *mask);
return status;
}
/*
* setup nvram
*/
SANE_Status
sanei_rts88xx_setup_nvram (SANE_Int devnum, SANE_Int length,
SANE_Byte * value)
{
SANE_Status status = SANE_STATUS_GOOD;
SANE_Byte local[2], reg;
int i;
status = sanei_rts88xx_nvram_ctrl (devnum, length, value);
#ifndef HAZARDOUS_EXPERIMENT
return SANE_STATUS_GOOD;
#endif
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "sanei_rts88xx_setup_nvram : failed step #1 ...\n");
return status;
}
local[0] = 0x18;
local[1] = 0x08;
for (i = 0; i < 8; i++)
{
status = sanei_rts88xx_nvram_ctrl (devnum, 2, local);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "sanei_rts88xx_setup_nvram : failed loop #%d ...\n",
i);
return status;
}
status = sanei_rts88xx_read_reg (devnum, 0x10, ®);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error,
"sanei_rts88xx_setup_nvram : register reading failed loop #%d ...\n",
i);
return status;
}
DBG (DBG_io, "sanei_rts88xx_setup_nvram: reg[0x10]=0x%02x\n", reg);
}
reg = 0;
status = sanei_rts88xx_write_reg (devnum, CONTROLER_REG, ®);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error,
"sanei_rts88xx_setup_nvram : controler register write failed\n");
return status;
}
reg = 1;
status = sanei_rts88xx_write_reg (devnum, CONTROLER_REG, ®);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error,
"sanei_rts88xx_setup_nvram : controler register write failed\n");
return status;
}
return status;
}
/*
* write to special control register CONTROL_REG=0xb3
*/
SANE_Status
sanei_rts88xx_write_control (SANE_Int devnum, SANE_Byte value)
{
SANE_Status status;
status = sanei_rts88xx_write_reg (devnum, CONTROL_REG, &value);
return status;
}
/**
* wait for the scanning head to reach home position
*/
static SANE_Status
rts8891_wait_for_home (struct Rts8891_Device *device, SANE_Byte * regs)
{
SANE_Status status = SANE_STATUS_GOOD;
SANE_Byte motor, sensor, reg;
DBG (DBG_proc, "rts8891_wait_for_home: start\n");
/* wait for controller home bit to raise, no timeout */
/* at each loop we check that motor is on, then that the sensor bit it cleared */
do
{
sanei_rts88xx_read_reg (device->devnum, CONTROL_REG, &motor);
sanei_rts88xx_read_reg (device->devnum, CONTROLER_REG, &sensor);
}
while ((motor & 0x08) && ((sensor & 0x02) == 0));
/* flag that device has finished parking */
device->parking=SANE_FALSE;
/* check for error */
if (((motor & 0x08) == 0x00) && ((sensor & 0x02) == 0))
{
DBG (DBG_error,
"rts8891_wait_for_home: error, motor stopped before head parked\n");
status = SANE_STATUS_INVAL;
}
/* re-enable CCD */
regs[0] = regs[0] & 0xef;
sanei_rts88xx_cancel (device->devnum);
/* reset ? so we don't need to read data */
reg = 0;
/* b7: movement on/off, b3-b0 : movement divisor */
sanei_rts88xx_write_reg (device->devnum, 0x33, ®);
sanei_rts88xx_write_reg (device->devnum, 0x33, ®);
/* movement direction */
sanei_rts88xx_write_reg (device->devnum, 0x36, ®);
sanei_rts88xx_cancel (device->devnum);
DBG (DBG_proc, "rts8891_wait_for_home: end\n");
return status;
}
/* this functions "commits" pending scan command */
static SANE_Status
rts8891_commit (SANE_Int devnum, SANE_Byte value)
{
SANE_Status status;
SANE_Byte reg;
reg = value;
sanei_rts88xx_write_reg (devnum, 0xd3, ®);
sanei_rts88xx_cancel (devnum);
sanei_rts88xx_write_control (devnum, 0x08);
status = sanei_rts88xx_write_control (devnum, 0x08);
return status;
}
/* reads data from scanner.
* First we wait for some data to be available and then loop reading
* from scanner until the required amount is reached.
* We handle non blocking I/O by returning immediatly (with SANE_STATUS_BUSY)
* if there is no data available from scanner. But once read is started,
* all the required amount is read. Once wait for data succeeded, we still poll
* for data in order no to read it too fast, but we don' take care of non blocking
* mode since we cope with it on first data wait.
*/
static SANE_Status
read_data (struct Rts8891_Session *session, SANE_Byte * dest, SANE_Int length)
{
SANE_Status status = SANE_STATUS_GOOD;
SANE_Int count, read, len, dummy;
struct Rts8891_Device *dev = session->dev;
static FILE *raw = NULL; /* for debugging purpose we need it static */
SANE_Byte control = 0x08;
unsigned char buffer[RTS88XX_MAX_XFER_SIZE];
DBG (DBG_proc, "read_data: start\n");
DBG (DBG_proc, "read_data: requiring %d bytes\n", length);
/* wait for data being available and handle non blocking mode */
/* only when data reading hasn't produce any data yet */
if (dev->read == 0)
{
do
{
status = sanei_rts88xx_data_count (dev->devnum, &count);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "read_data: failed to wait for data\n");
return status;
}
if (count == 0)
{
sanei_rts88xx_read_reg (dev->devnum, CONTROL_REG, &control);
if ((control & 0x08) == 0 && (count == 0))
{
DBG (DBG_error,
"read_data: scanner stopped being busy before data are available\n");
return SANE_STATUS_IO_ERROR;
}
}
/* in case there is no data, we return BUSY since this mean */
/* that scanning head hasn't reach is position and data hasn't */
/* come yet */
if (session->non_blocking && count == 0)
{
dev->regs[LAMP_REG] = 0x8d;
sanei_rts88xx_write_reg (dev->devnum, LAMP_REG,
&(dev->regs[LAMP_REG]));
DBG (DBG_io, "read_data: no data vailable\n");
DBG (DBG_proc, "read_data: end\n");
return SANE_STATUS_DEVICE_BUSY;
}
}
while (count == 0);
}
else
{ /* start of read for a new block */
status = sanei_rts88xx_data_count (dev->devnum, &count);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "read_data: failed to wait for data\n");
return status;
}
if (count == 0)
{
sanei_rts88xx_read_reg (dev->devnum, CONTROL_REG, &control);
if ((control & 0x08) == 0 && (count == 0))
{
DBG (DBG_error,
"read_data: scanner stopped being busy before data are available\n");
return SANE_STATUS_IO_ERROR;
}
}
}
/* fill scanned data buffer */
read = 0;
/* now loop reading data until we have the amount requested */
/* we also take care of not reading too much data */
while (read < length && dev->read < dev->to_read
&& ((control & 0x08) == 0x08))
{
/* used to sync */
if (dev->read == 0)
{
status = sanei_rts88xx_data_count (dev->devnum, &dummy);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "read_data: failed to read data count\n");
return status;
}
}
/* if there is data to read, read it */
if (count > 0)
{
len = count;
if (len > RTS88XX_MAX_XFER_SIZE)
{
len = RTS88XX_MAX_XFER_SIZE;
}
/* we only read even size blocks of data */
if (len & 1)
{
DBG (DBG_io, "read_data: round to next even number\n");
len++;
}
if (len > length - read)
{
len = length - read;
}
status = sanei_rts88xx_read_data (dev->devnum, &len, dest + read);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "read_data: failed to read from scanner\n");
return status;
}
/* raw data tracing */
if (DBG_LEVEL >= DBG_io2)
{
/* open a new file only when no data scanned */
if (dev->read == 0)
{
raw = fopen ("raw_data.pnm", "wb");
if (raw != NULL)
{
/* PNM header */
fprintf (raw, "P%c\n%d %d\n255\n",
session->params.format ==
SANE_FRAME_RGB
|| session->emulated_gray ==
SANE_TRUE ? '6' : '5', dev->pixels,
dev->lines);
}
}
if (raw != NULL)
{
fwrite (dest + read, 1, len, raw);
}
}
/* move pointer and counter */
read += len;
dev->read += len;
DBG (DBG_io2, "read_data: %d/%d\n", dev->read, dev->to_read);
}
/* in fast scan mode, read data count
* in slow scan, head moves by the amount of data read */
status = sanei_rts88xx_data_count (dev->devnum, &count);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "read_data: failed to read data count\n");
return status;
}
/* if no data, check if still scanning */
if (count == 0 && dev->read < dev->to_read)
{
sanei_rts88xx_read_reg (dev->devnum, CONTROL_REG, &control);
if ((control & 0x08) == 0x00)
{
DBG (DBG_error,
"read_data: scanner stopped being busy before data are available\n");
return SANE_STATUS_IO_ERROR;
}
}
}
/* end of physical reads */
if (dev->read >= dev->to_read)
{
/* check there is no more data in case of a bug */
sanei_rts88xx_data_count (dev->devnum, &count);
if (count > 0)
{
DBG (DBG_warn,
"read_data: %d bytes are still available from scanner\n",
count);
/* flush left-over data */
while (count > 0)
{
len = count;
if (len > RTS88XX_MAX_XFER_SIZE)
{
len = RTS88XX_MAX_XFER_SIZE;
}
/* we only read even size blocks of data */
if (len & 1)
{
len++;
}
sanei_rts88xx_read_data (dev->devnum, &len, buffer);
sanei_rts88xx_data_count (dev->devnum, &count);
}
}
/* wait for motor to stop at the end of the scan */
do
{
sanei_rts88xx_read_reg (dev->devnum, CONTROL_REG, &control);
}
while ((control & 0x08) != 0);
/* close log file if needed */
if (DBG_LEVEL >= DBG_io2)
{
if (raw != NULL)
{
fclose (raw);
raw = NULL;
}
}
}
DBG (DBG_io, "read_data: read %d bytes from scanner\n", length);
DBG (DBG_proc, "read_data: end\n");
return status;
}
/* resets lamp */
SANE_Status
sanei_rts88xx_reset_lamp (SANE_Int devnum, SANE_Byte * regs)
{
SANE_Status status;
SANE_Byte reg;
/* read the 0xda register, then clear lower nibble and write it back */
status = sanei_rts88xx_read_reg (devnum, 0xda, ®);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error,
"sanei_rts88xx_reset_lamp: failed to read 0xda register\n");
return status;
}
reg = 0xa0;
status = sanei_rts88xx_write_reg (devnum, 0xda, ®);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error,
"sanei_rts88xx_reset_lamp: failed to write 0xda register\n");
return status;
}
/* on cleared, get status */
status = sanei_rts88xx_get_status (devnum, regs);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error, "sanei_rts88xx_reset_lamp: failed to get status\n");
return status;
}
DBG (DBG_io, "sanei_rts88xx_reset_lamp: status=0x%02x 0x%02x\n", regs[0x10],
regs[0x11]);
/* set low nibble to 7 and write it */
reg = reg | 0x07;
status = sanei_rts88xx_write_reg (devnum, 0xda, ®);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error,
"sanei_rts88xx_reset_lamp: failed to write 0xda register\n");
return status;
}
status = sanei_rts88xx_read_reg (devnum, 0xda, ®);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_error,
"sanei_rts88xx_reset_lamp: failed to read 0xda register\n");
return status;
}
if (reg != 0xa7)
{
DBG (DBG_warn,
"sanei_rts88xx_reset_lamp: expected reg[0xda]=0xa7, got 0x%02x\n",
reg);
}
/* store read value in shadow register */
regs[0xda] = reg;
return status;
}
