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Subject[PATCH] staging: comedi: refactor adq12b driver to remove forward declarations
Date
Move the module_init/module_exit routines and the associated
struct comedi_driver and struct boardtype variables to the end
of the source as is more typically done with other drivers. Then
rearrange the attach/detach functions, this removes the need
for all the forward declarations.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Mori Hess <fmhess@users.sourceforge.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/comedi/drivers/adq12b.c b/drivers/staging/comedi/drivers/adq12b.c
index 5361f31..275cb77 100644
--- a/drivers/staging/comedi/drivers/adq12b.c
+++ b/drivers/staging/comedi/drivers/adq12b.c
@@ -125,24 +125,6 @@ struct adq12b_board {
int do_chans;
};

-static const struct adq12b_board adq12b_boards[] = {
- {
- .name = "adq12b",
- .ai_se_chans = 16,
- .ai_diff_chans = 8,
- .ai_bits = 12,
- .di_chans = 5,
- .do_chans = 8}
-/* potentially, more adq-based deviced will be added */
-/*,
- .name = "adq12b",
- .ai_chans = 16, // this is just for reference, hardcoded again later
- .ai_bits = 12,
- .di_chans = 8,
- .do_chans = 5
- }*/
-};
-
#define thisboard ((const struct adq12b_board *)dev->board_ptr)

struct adq12b_private {
@@ -156,41 +138,88 @@ struct adq12b_private {
#define devpriv ((struct adq12b_private *)dev->private)

/*
- * The struct comedi_driver structure tells the Comedi core module
- * which functions to call to configure/deconfigure (attach/detach)
- * the board, and also about the kernel module that contains
- * the device code.
+ * "instructions" read/write data in "one-shot" or "software-triggered"
+ * mode.
*/
-static int adq12b_attach(struct comedi_device *dev,
- struct comedi_devconfig *it);
-static int adq12b_detach(struct comedi_device *dev);
-
-static struct comedi_driver driver_adq12b = {
- .driver_name = "adq12b",
- .module = THIS_MODULE,
- .attach = adq12b_attach,
- .detach = adq12b_detach,
- .board_name = &adq12b_boards[0].name,
- .offset = sizeof(struct adq12b_board),
- .num_names = ARRAY_SIZE(adq12b_boards),
-};

static int adq12b_ai_rinsn(struct comedi_device *dev,
struct comedi_subdevice *s, struct comedi_insn *insn,
- unsigned int *data);
+ unsigned int *data)
+{
+ int n, i;
+ int range, channel;
+ unsigned char hi, lo, status;
+
+ /* change channel and range only if it is different from the previous */
+ range = CR_RANGE(insn->chanspec);
+ channel = CR_CHAN(insn->chanspec);
+ if (channel != devpriv->last_channel || range != devpriv->last_range) {
+ outb((range << 4) | channel, dev->iobase + ADQ12B_CTREG);
+ udelay(50); /* wait for the mux to settle */
+ }
+
+ /* trigger conversion */
+ status = inb(dev->iobase + ADQ12B_ADLOW);
+
+ /* convert n samples */
+ for (n = 0; n < insn->n; n++) {
+
+ /* wait for end of conversion */
+ i = 0;
+ do {
+ /* udelay(1); */
+ status = inb(dev->iobase + ADQ12B_STINR);
+ status = status & ADQ12B_EOC;
+ } while (status == 0 && ++i < TIMEOUT);
+ /* } while (++i < 10); */
+
+ /* read data */
+ hi = inb(dev->iobase + ADQ12B_ADHIG);
+ lo = inb(dev->iobase + ADQ12B_ADLOW);
+
+ /* printk("debug: chan=%d range=%d status=%d hi=%d lo=%d\n",
+ channel, range, status, hi, lo); */
+ data[n] = (hi << 8) | lo;
+
+ }
+
+ /* return the number of samples read/written */
+ return n;
+}
+
static int adq12b_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data);
+ struct comedi_insn *insn, unsigned int *data)
+{
+
+ /* only bits 0-4 have information about digital inputs */
+ data[1] = (inb(dev->iobase + ADQ12B_STINR) & (0x1f));
+
+ return 2;
+}
+
static int adq12b_do_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data);
+ struct comedi_insn *insn, unsigned int *data)
+{
+ int channel;
+
+ for (channel = 0; channel < 8; channel++)
+ if (((data[0] >> channel) & 0x01) != 0)
+ outb((((data[1] >> channel) & 0x01) << 3) | channel,
+ dev->iobase + ADQ12B_OUTBR);
+
+ /* store information to retrieve when asked for reading */
+ if (data[0]) {
+ devpriv->digital_state &= ~data[0];
+ devpriv->digital_state |= (data[0] & data[1]);
+ }
+
+ data[1] = devpriv->digital_state;
+
+ return 2;
+}

-/*
- * Attach is called by the Comedi core to configure the driver
- * for a particular board. If you specified a board_name array
- * in the driver structure, dev->board_ptr contains that
- * address.
- */
static int adq12b_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct comedi_subdevice *s;
@@ -295,14 +324,6 @@ static int adq12b_attach(struct comedi_device *dev, struct comedi_devconfig *it)
return 0;
}

-/*
- * _detach is called to deconfigure a device. It should deallocate
- * resources.
- * This function is also called when _attach() fails, so it should be
- * careful not to release resources that were not necessarily
- * allocated by _attach(). dev->private and dev->subdevices are
- * deallocated automatically by the core.
- */
static int adq12b_detach(struct comedi_device *dev)
{
if (dev->iobase)
@@ -315,104 +336,37 @@ static int adq12b_detach(struct comedi_device *dev)
return 0;
}

-/*
- * "instructions" read/write data in "one-shot" or "software-triggered"
- * mode.
- */
-
-static int adq12b_ai_rinsn(struct comedi_device *dev,
- struct comedi_subdevice *s, struct comedi_insn *insn,
- unsigned int *data)
-{
- int n, i;
- int range, channel;
- unsigned char hi, lo, status;
-
- /* change channel and range only if it is different from the previous */
- range = CR_RANGE(insn->chanspec);
- channel = CR_CHAN(insn->chanspec);
- if (channel != devpriv->last_channel || range != devpriv->last_range) {
- outb((range << 4) | channel, dev->iobase + ADQ12B_CTREG);
- udelay(50); /* wait for the mux to settle */
- }
-
- /* trigger conversion */
- status = inb(dev->iobase + ADQ12B_ADLOW);
-
- /* convert n samples */
- for (n = 0; n < insn->n; n++) {
-
- /* wait for end of conversion */
- i = 0;
- do {
- /* udelay(1); */
- status = inb(dev->iobase + ADQ12B_STINR);
- status = status & ADQ12B_EOC;
- } while (status == 0 && ++i < TIMEOUT);
- /* } while (++i < 10); */
-
- /* read data */
- hi = inb(dev->iobase + ADQ12B_ADHIG);
- lo = inb(dev->iobase + ADQ12B_ADLOW);
-
- /* printk("debug: chan=%d range=%d status=%d hi=%d lo=%d\n",
- channel, range, status, hi, lo); */
- data[n] = (hi << 8) | lo;
-
- }
-
- /* return the number of samples read/written */
- return n;
-}
-
-static int adq12b_di_insn_bits(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data)
-{
-
- /* only bits 0-4 have information about digital inputs */
- data[1] = (inb(dev->iobase + ADQ12B_STINR) & (0x1f));
-
- return 2;
-}
-
-static int adq12b_do_insn_bits(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data)
-{
- int channel;
-
- for (channel = 0; channel < 8; channel++)
- if (((data[0] >> channel) & 0x01) != 0)
- outb((((data[1] >> channel) & 0x01) << 3) | channel,
- dev->iobase + ADQ12B_OUTBR);
-
- /* store information to retrieve when asked for reading */
- if (data[0]) {
- devpriv->digital_state &= ~data[0];
- devpriv->digital_state |= (data[0] & data[1]);
- }
-
- data[1] = devpriv->digital_state;
+static const struct adq12b_board adq12b_boards[] = {
+ {
+ .name = "adq12b",
+ .ai_se_chans = 16,
+ .ai_diff_chans = 8,
+ .ai_bits = 12,
+ .di_chans = 5,
+ .do_chans = 8,
+ },
+};

- return 2;
-}
+static struct comedi_driver driver_adq12b = {
+ .driver_name = "adq12b",
+ .module = THIS_MODULE,
+ .attach = adq12b_attach,
+ .detach = adq12b_detach,
+ .board_name = &adq12b_boards[0].name,
+ .offset = sizeof(struct adq12b_board),
+ .num_names = ARRAY_SIZE(adq12b_boards),
+};

-/*
- * A convenient macro that defines init_module() and cleanup_module(),
- * as necessary.
- */
static int __init driver_adq12b_init_module(void)
{
return comedi_driver_register(&driver_adq12b);
}
+module_init(driver_adq12b_init_module);

static void __exit driver_adq12b_cleanup_module(void)
{
comedi_driver_unregister(&driver_adq12b);
}
-
-module_init(driver_adq12b_init_module);
module_exit(driver_adq12b_cleanup_module);

MODULE_AUTHOR("Comedi http://www.comedi.org");

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