From: H Hartley Sweeten Date: Mon, 23 Apr 2012 22:57:48 +0000 (-0700) Subject: staging: comedi: refactor adq12b driver to remove forward declarations X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=632d391b3572673fc272a6fd74e5c753065eca1c;p=linux-beck.git staging: comedi: refactor adq12b driver to remove forward declarations 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 Cc: Ian Abbott Cc: Mori Hess Cc: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/adq12b.c b/drivers/staging/comedi/drivers/adq12b.c index 5361f318b010..275cb771f776 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");