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staging: comedi: adv_pci_dio: refactor 's8254' boardinfo 

The boardinfo for the 8254 timer is overly complex. The 8254 timer always has
3 channels and the 'regs' and 'specflags' members of diosubd_data are not
used. The only necessary information is the base 'addr' offset to the 8254
registers.

Replace the 's8254' member with an unsigned long 'timer_regbase'. Use that
to determine if the board has an 8254 timer during the attach of the driver.
Save the 'timer_regbase' in the subdevice 'private' pointer to use in the
subdevice functions.

For aesthetics, absorb pci_dio_add_8254() into the driver attach function.

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 2015-02-23 14:57:48 -07:00 committed by Greg Kroah-Hartman
parent 50e338b96c
commit 0275299f26
1 changed files with 19 additions and 32 deletions
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51
drivers/staging/comedi/drivers/adv_pci_dio.c
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@ -224,7 +224,7 @@ struct diosubd_data {
int chans; /* num of chans */
int addr; /* PCI address ofset */
int regs; /* number of registers to read or 8255
subdevices or 8254 chips */
subdevices */
unsigned int specflags; /* addon subdevice flags */
};
@ -237,7 +237,7 @@ struct dio_boardtype {
struct diosubd_data sdo[MAX_DO_SUBDEVS]; /* DO chans */
struct diosubd_data sdio[MAX_DIO_SUBDEVG]; /* DIO 8255 chans */
struct diosubd_data boardid; /* card supports board ID switch */
struct diosubd_data s8254[1]; /* 8254 subdevices */
unsigned long timer_regbase;
enum hw_io_access io_access;
};
@ -280,7 +280,7 @@ static const struct dio_boardtype boardtypes[] = {
.sdi[0] = { 32, PCI1735_DI, 4, 0, },
.sdo[0] = { 32, PCI1735_DO, 4, 0, },
.boardid = { 4, PCI1735_BOARDID, 1, SDF_INTERNAL, },
.s8254[0] = { 3, PCI1735_C8254, 1, 0, },
.timer_regbase = PCI1735_C8254,
.io_access = IO_8b,
},
[TYPE_PCI1736] = {
@ -316,7 +316,7 @@ static const struct dio_boardtype boardtypes[] = {
.cardtype = TYPE_PCI1751,
.nsubdevs = 3,
.sdio[0] = { 48, PCI1751_DIO, 2, 0, },
.s8254[0] = { 3, PCI1751_CNT, 1, 0, },
.timer_regbase = PCI1751_CNT,
.io_access = IO_8b,
},
[TYPE_PCI1752] = {
@ -485,12 +485,12 @@ static int pci_8254_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
const struct diosubd_data *d = (const struct diosubd_data *)s->private;
unsigned long timer_regbase = (unsigned long)s->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned long flags;
spin_lock_irqsave(&s->spin_lock, flags);
data[0] = i8254_read(dev->iobase + d->addr, 0, chan);
data[0] = i8254_read(dev->iobase + timer_regbase, 0, chan);
spin_unlock_irqrestore(&s->spin_lock, flags);
return 1;
}
@ -502,12 +502,12 @@ static int pci_8254_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
const struct diosubd_data *d = (const struct diosubd_data *)s->private;
unsigned long timer_regbase = (unsigned long)s->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned long flags;
spin_lock_irqsave(&s->spin_lock, flags);
i8254_write(dev->iobase + d->addr, 0, chan, data[0]);
i8254_write(dev->iobase + timer_regbase, 0, chan, data[0]);
spin_unlock_irqrestore(&s->spin_lock, flags);
return 1;
}
@ -519,9 +519,9 @@ static int pci_8254_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
const struct diosubd_data *d = (const struct diosubd_data *)s->private;
unsigned long timer_regbase = (unsigned long)s->private;
unsigned long iobase = dev->iobase + timer_regbase;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned long iobase = dev->iobase + d->addr;
int ret = 0;
unsigned long flags;
@ -1011,26 +1011,6 @@ static int pci_dio_add_do(struct comedi_device *dev,
return 0;
}
/*
==============================================================================
*/
static int pci_dio_add_8254(struct comedi_device *dev,
struct comedi_subdevice *s,
const struct diosubd_data *d)
{
s->type = COMEDI_SUBD_COUNTER;
s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
s->n_chan = d->chans;
s->maxdata = 65535;
s->len_chanlist = d->chans;
s->insn_read = pci_8254_insn_read;
s->insn_write = pci_8254_insn_write;
s->insn_config = pci_8254_insn_config;
s->private = (void *)d;
return 0;
}
static unsigned long pci_dio_override_cardtype(struct pci_dev *pcidev,
unsigned long cardtype)
{
@ -1126,9 +1106,16 @@ static int pci_dio_auto_attach(struct comedi_device *dev,
subdev++;
}
if (this_board->s8254[0].chans) {
if (this_board->timer_regbase) {
s = &dev->subdevices[subdev];
pci_dio_add_8254(dev, s, &this_board->s8254[0]);
s->type = COMEDI_SUBD_COUNTER;
s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
s->n_chan = 3;
s->maxdata = 65535;
s->insn_read = pci_8254_insn_read;
s->insn_write = pci_8254_insn_write;
s->insn_config = pci_8254_insn_config;
s->private = (void *)this_board->timer_regbase;
subdev++;
}