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staging: comedi: ni_labpc_common: use subdevice readback for eeprom 

Use the comedi_subdevice 'readback' member and the core provided (*insn_read)
to handle the readback of the eeprom subdevice. Remove the then unused
'eeprom_data' member from the private data.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-11-20 15:07:35 -07:00 committed by Greg Kroah-Hartman
parent c82f0e6b36
commit 45c311c438
2 changed files with 10 additions and 22 deletions
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2
drivers/staging/comedi/drivers/ni_labpc.h
View File

@ -68,8 +68,6 @@ struct labpc_private {
unsigned int dma_transfer_size;
/* we are using dma/fifo-half-full/etc. */
enum transfer_type current_transfer;
/* stores contents of board's eeprom */
unsigned int eeprom_data[EEPROM_SIZE];
/*
* function pointers so we can use inb/outb or readb/writeb as
* appropriate

30
drivers/staging/comedi/drivers/ni_labpc_common.c
View File

@ -1099,8 +1099,6 @@ static int labpc_eeprom_write(struct comedi_device *dev,
dev_err(dev->class_dev, "eeprom write timed out\n");
return -ETIME;
}
/* update software copy of eeprom */
devpriv->eeprom_data[address] = value;
/* enable read/write to eeprom */
devpriv->cmd5 &= ~CMD5_EEPROMCS;
@ -1202,29 +1200,18 @@ static int labpc_eeprom_insn_write(struct comedi_device *dev,
* data would be overwritten anyway.
*/
if (insn->n > 0) {
ret = labpc_eeprom_write(dev, chan, data[insn->n - 1]);
unsigned int val = data[insn->n - 1];
ret = labpc_eeprom_write(dev, chan, val);
if (ret)
return ret;
s->readback[chan] = val;
}
return insn->n;
}
static int labpc_eeprom_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct labpc_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
int i;
for (i = 0; i < insn->n; i++)
data[i] = devpriv->eeprom_data[chan];
return insn->n;
}
int labpc_common_attach(struct comedi_device *dev,
unsigned int irq, unsigned long isr_flags)
{
@ -1339,11 +1326,14 @@ int labpc_common_attach(struct comedi_device *dev,
s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
s->n_chan = EEPROM_SIZE;
s->maxdata = 0xff;
s->insn_read = labpc_eeprom_insn_read;
s->insn_write = labpc_eeprom_insn_write;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
for (i = 0; i < s->n_chan; i++)
devpriv->eeprom_data[i] = labpc_eeprom_read(dev, i);
s->readback[i] = labpc_eeprom_read(dev, i);
} else {
s->type = COMEDI_SUBD_UNUSED;
}