staging: comedi: adv_pci_dio: remove need for diosubd_data 'regs' member

Currently the (*insn_bits) functions used the 'regs' member to determine how
many registers need to be read or written to update the subdevice. We can use
the subdevice 'n_chan' to determine this and make the code a bit clearer.

The (*auto_attach) also uses this member to determine how many 8255 devices
need to be initialized. These subdevices do not use the 'chans' member of
diosubd_data. Move the 'regs' value to the 'chans' to allow removing the
'regs' member completely.

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>

diff --git a/drivers/staging/comedi/drivers/adv_pci_dio.c b/drivers/staging/comedi/drivers/adv_pci_dio.c
index ba3cb3b338e2bef743f1d26212410a9482bf7423..e620e34c70bc6cbc67a912cbee36d657bf6c1c1f 100644 (file)
--- a/drivers/staging/comedi/drivers/adv_pci_dio.c
+++ b/drivers/staging/comedi/drivers/adv_pci_dio.c
@@ -127,10 +127,8 @@ enum hw_cards_id {
 #define PCI1762_ISR       6    /* R:   Interrupt status register */
 
 struct diosubd_data {
-       int chans;              /*  num of chans */
+       int chans;              /*  num of chans or 8255 devices */
        int addr;               /*  PCI address ofset */
-       int regs;               /*  number of registers to read or 8255
-                                   subdevices */
 };
 
 struct dio_boardtype {
@@ -150,138 +148,144 @@ static const struct dio_boardtype boardtypes[] = {
                .name           = "pci1730",
                .cardtype       = TYPE_PCI1730,
                .nsubdevs       = 5,
-               .sdi[0]         = { 16, PCI1730_DI, 2, },
-               .sdi[1]         = { 16, PCI1730_IDI, 2, },
-               .sdo[0]         = { 16, PCI1730_DO, 2, },
-               .sdo[1]         = { 16, PCI1730_IDO, 2, },
-               .boardid        = { 4, PCI173x_BOARDID, 1, },
+               .sdi[0]         = { 16, PCI1730_DI, },
+               .sdi[1]         = { 16, PCI1730_IDI, },
+               .sdo[0]         = { 16, PCI1730_DO, },
+               .sdo[1]         = { 16, PCI1730_IDO, },
+               .boardid        = { 4, PCI173x_BOARDID, },
        },
        [TYPE_PCI1733] = {
                .name           = "pci1733",
                .cardtype       = TYPE_PCI1733,
                .nsubdevs       = 2,
-               .sdi[1]         = { 32, PCI1733_IDI, 4, },
-               .boardid        = { 4, PCI173x_BOARDID, 1, },
+               .sdi[1]         = { 32, PCI1733_IDI, },
+               .boardid        = { 4, PCI173x_BOARDID, },
        },
        [TYPE_PCI1734] = {
                .name           = "pci1734",
                .cardtype       = TYPE_PCI1734,
                .nsubdevs       = 2,
-               .sdo[1]         = { 32, PCI1734_IDO, 4, },
-               .boardid        = { 4, PCI173x_BOARDID, 1, },
+               .sdo[1]         = { 32, PCI1734_IDO, },
+               .boardid        = { 4, PCI173x_BOARDID, },
        },
        [TYPE_PCI1735] = {
                .name           = "pci1735",
                .cardtype       = TYPE_PCI1735,
                .nsubdevs       = 4,
-               .sdi[0]         = { 32, PCI1735_DI, 4, },
-               .sdo[0]         = { 32, PCI1735_DO, 4, },
-               .boardid        = { 4, PCI1735_BOARDID, 1, },
+               .sdi[0]         = { 32, PCI1735_DI, },
+               .sdo[0]         = { 32, PCI1735_DO, },
+               .boardid        = { 4, PCI1735_BOARDID, },
                .timer_regbase  = PCI1735_C8254,
        },
        [TYPE_PCI1736] = {
                .name           = "pci1736",
                .cardtype       = TYPE_PCI1736,
                .nsubdevs       = 3,
-               .sdi[1]         = { 16, PCI1736_IDI, 2, },
-               .sdo[1]         = { 16, PCI1736_IDO, 2, },
-               .boardid        = { 4, PCI1736_BOARDID, 1, },
+               .sdi[1]         = { 16, PCI1736_IDI, },
+               .sdo[1]         = { 16, PCI1736_IDO, },
+               .boardid        = { 4, PCI1736_BOARDID, },
        },
        [TYPE_PCI1739] = {
                .name           = "pci1739",
                .cardtype       = TYPE_PCI1739,
                .nsubdevs       = 2,
-               .sdio[0]        = { 48, PCI1739_DIO, 2, },
+               .sdio[0]        = { 2, PCI1739_DIO, },
        },
        [TYPE_PCI1750] = {
                .name           = "pci1750",
                .cardtype       = TYPE_PCI1750,
                .nsubdevs       = 2,
-               .sdi[1]         = { 16, PCI1750_IDI, 2, },
-               .sdo[1]         = { 16, PCI1750_IDO, 2, },
+               .sdi[1]         = { 16, PCI1750_IDI, },
+               .sdo[1]         = { 16, PCI1750_IDO, },
        },
        [TYPE_PCI1751] = {
                .name           = "pci1751",
                .cardtype       = TYPE_PCI1751,
                .nsubdevs       = 3,
-               .sdio[0]        = { 48, PCI1751_DIO, 2, },
+               .sdio[0]        = { 2, PCI1751_DIO, },
                .timer_regbase  = PCI1751_CNT,
        },
        [TYPE_PCI1752] = {
                .name           = "pci1752",
                .cardtype       = TYPE_PCI1752,
                .nsubdevs       = 3,
-               .sdo[0]         = { 32, PCI1752_IDO, 2, },
-               .sdo[1]         = { 32, PCI1752_IDO2, 2, },
-               .boardid        = { 4, PCI175x_BOARDID, 1, },
+               .sdo[0]         = { 32, PCI1752_IDO, },
+               .sdo[1]         = { 32, PCI1752_IDO2, },
+               .boardid        = { 4, PCI175x_BOARDID, },
                .is_16bit       = 1,
        },
        [TYPE_PCI1753] = {
                .name           = "pci1753",
                .cardtype       = TYPE_PCI1753,
                .nsubdevs       = 4,
-               .sdio[0]        = { 96, PCI1753_DIO, 4, },
+               .sdio[0]        = { 4, PCI1753_DIO, },
        },
        [TYPE_PCI1753E] = {
                .name           = "pci1753e",
                .cardtype       = TYPE_PCI1753E,
                .nsubdevs       = 8,
-               .sdio[0]        = { 96, PCI1753_DIO, 4, },
-               .sdio[1]        = { 96, PCI1753E_DIO, 4, },
+               .sdio[0]        = { 4, PCI1753_DIO, },
+               .sdio[1]        = { 4, PCI1753E_DIO, },
        },
        [TYPE_PCI1754] = {
                .name           = "pci1754",
                .cardtype       = TYPE_PCI1754,
                .nsubdevs       = 3,
-               .sdi[0]         = { 32, PCI1754_IDI, 2, },
-               .sdi[1]         = { 32, PCI1754_IDI2, 2, },
-               .boardid        = { 4, PCI175x_BOARDID, 1, },
+               .sdi[0]         = { 32, PCI1754_IDI, },
+               .sdi[1]         = { 32, PCI1754_IDI2, },
+               .boardid        = { 4, PCI175x_BOARDID, },
                .is_16bit       = 1,
        },
        [TYPE_PCI1756] = {
                .name           = "pci1756",
                .cardtype       = TYPE_PCI1756,
                .nsubdevs       = 3,
-               .sdi[1]         = { 32, PCI1756_IDI, 2, },
-               .sdo[1]         = { 32, PCI1756_IDO, 2, },
-               .boardid        = { 4, PCI175x_BOARDID, 1, },
+               .sdi[1]         = { 32, PCI1756_IDI, },
+               .sdo[1]         = { 32, PCI1756_IDO, },
+               .boardid        = { 4, PCI175x_BOARDID, },
                .is_16bit       = 1,
        },
        [TYPE_PCI1762] = {
                .name           = "pci1762",
                .cardtype       = TYPE_PCI1762,
                .nsubdevs       = 3,
-               .sdi[1]         = { 16, PCI1762_IDI, 1, },
-               .sdo[1]         = { 16, PCI1762_RO, 1, },
-               .boardid        = { 4, PCI1762_BOARDID, 1, },
+               .sdi[1]         = { 16, PCI1762_IDI, },
+               .sdo[1]         = { 16, PCI1762_RO, },
+               .boardid        = { 4, PCI1762_BOARDID, },
                .is_16bit       = 1,
        },
 };
 
 static int pci_dio_insn_bits_di_b(struct comedi_device *dev,
                                  struct comedi_subdevice *s,
-                                 struct comedi_insn *insn, unsigned int *data)
+                                 struct comedi_insn *insn,
+                                 unsigned int *data)
 {
        const struct diosubd_data *d = (const struct diosubd_data *)s->private;
-       int i;
+       unsigned long iobase = dev->iobase + d->addr;
 
-       data[1] = 0;
-       for (i = 0; i < d->regs; i++)
-               data[1] |= inb(dev->iobase + d->addr + i) << (8 * i);
+       data[1] = inb(iobase);
+       if (s->n_chan > 8)
+               data[1] |= (inb(iobase + 1) << 8);
+       if (s->n_chan > 16)
+               data[1] |= (inb(iobase + 2) << 16);
+       if (s->n_chan > 24)
+               data[1] |= (inb(iobase + 3) << 24);
 
        return insn->n;
 }
 
 static int pci_dio_insn_bits_di_w(struct comedi_device *dev,
                                  struct comedi_subdevice *s,
-                                 struct comedi_insn *insn, unsigned int *data)
+                                 struct comedi_insn *insn,
+                                 unsigned int *data)
 {
        const struct diosubd_data *d = (const struct diosubd_data *)s->private;
-       int i;
+       unsigned long iobase = dev->iobase + d->addr;
 
-       data[1] = 0;
-       for (i = 0; i < d->regs; i++)
-               data[1] |= inw(dev->iobase + d->addr + 2 * i) << (16 * i);
+       data[1] = inw(iobase);
+       if (s->n_chan > 16)
+               data[1] |= (inw(iobase + 2) << 16);
 
        return insn->n;
 }
@@ -292,12 +296,16 @@ static int pci_dio_insn_bits_do_b(struct comedi_device *dev,
                                  unsigned int *data)
 {
        const struct diosubd_data *d = (const struct diosubd_data *)s->private;
-       int i;
+       unsigned long iobase = dev->iobase + d->addr;
 
        if (comedi_dio_update_state(s, data)) {
-               for (i = 0; i < d->regs; i++)
-                       outb((s->state >> (8 * i)) & 0xff,
-                            dev->iobase + d->addr + i);
+               outb(s->state & 0xff, iobase);
+               if (s->n_chan > 8)
+                       outb((s->state >> 8) & 0xff, iobase + 1);
+               if (s->n_chan > 16)
+                       outb((s->state >> 16) & 0xff, iobase + 2);
+               if (s->n_chan > 24)
+                       outb((s->state >> 24) & 0xff, iobase + 3);
        }
 
        data[1] = s->state;
@@ -311,12 +319,12 @@ static int pci_dio_insn_bits_do_w(struct comedi_device *dev,
                                  unsigned int *data)
 {
        const struct diosubd_data *d = (const struct diosubd_data *)s->private;
-       int i;
+       unsigned long iobase = dev->iobase + d->addr;
 
        if (comedi_dio_update_state(s, data)) {
-               for (i = 0; i < d->regs; i++)
-                       outw((s->state >> (16 * i)) & 0xffff,
-                            dev->iobase + d->addr + 2 * i);
+               outw(s->state & 0xffff, iobase);
+               if (s->n_chan > 16)
+                       outw((s->state >> 16) & 0xffff, iobase + 2);
        }
 
        data[1] = s->state;
@@ -519,7 +527,7 @@ static int pci_dio_auto_attach(struct comedi_device *dev,
 
        for (i = 0; i < MAX_DIO_SUBDEVG; i++) {
                d = &board->sdio[i];
-               for (j = 0; j < d->regs; j++) {
+               for (j = 0; j < d->chans; j++) {
                        s = &dev->subdevices[subdev++];
                        ret = subdev_8255_init(dev, s, NULL,
                                               d->addr + j * I8255_SIZE);