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Commit 30c687c1 authored by Bill Pemberton's avatar Bill Pemberton Committed by Greg Kroah-Hartman
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Staging: comedi: remove C99 comments in ni_at_a2150.c 

Signed-off-by: default avatarBill Pemberton <wfp5p@virginia.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 79a31bae
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Showing with 91 additions and 91 deletions
drivers/staging/comedi/drivers/ni_at_a2150.c
View file @ 30c687c1
...@@ -73,10 +73,10 @@ TRIG_WAKE_EOS ...@@ -73,10 +73,10 @@ TRIG_WAKE_EOS
#include "comedi_fc.h" #include "comedi_fc.h"
#define A2150_SIZE 28 #define A2150_SIZE 28
#define A2150_DMA_BUFFER_SIZE 0xff00 // size in bytes of dma buffer #define A2150_DMA_BUFFER_SIZE 0xff00 /* size in bytes of dma buffer */
//#define A2150_DEBUG // enable debugging code /* #define A2150_DEBUG enable debugging code */
#undef A2150_DEBUG // disable debugging code #undef A2150_DEBUG /* disable debugging code */
/* Registers and bits */ /* Registers and bits */
#define CONFIG_REG 0x0 #define CONFIG_REG 0x0
...@@ -85,48 +85,48 @@ TRIG_WAKE_EOS ...@@ -85,48 +85,48 @@ TRIG_WAKE_EOS
#define CLOCK_SELECT_BITS(x) (((x) & 0x3) << 3) #define CLOCK_SELECT_BITS(x) (((x) & 0x3) << 3)
#define CLOCK_DIVISOR_BITS(x) (((x) & 0x3) << 5) #define CLOCK_DIVISOR_BITS(x) (((x) & 0x3) << 5)
#define CLOCK_MASK (0xf << 3) #define CLOCK_MASK (0xf << 3)
#define ENABLE0_BIT 0x80 // enable (don't internally ground) channels 0 and 1 #define ENABLE0_BIT 0x80 /* enable (don't internally ground) channels 0 and 1 */
#define ENABLE1_BIT 0x100 // enable (don't internally ground) channels 2 and 3 #define ENABLE1_BIT 0x100 /* enable (don't internally ground) channels 2 and 3 */
#define AC0_BIT 0x200 // ac couple channels 0,1 #define AC0_BIT 0x200 /* ac couple channels 0,1 */
#define AC1_BIT 0x400 // ac couple channels 2,3 #define AC1_BIT 0x400 /* ac couple channels 2,3 */
#define APD_BIT 0x800 // analog power down #define APD_BIT 0x800 /* analog power down */
#define DPD_BIT 0x1000 // digital power down #define DPD_BIT 0x1000 /* digital power down */
#define TRIGGER_REG 0x2 // trigger config register #define TRIGGER_REG 0x2 /* trigger config register */
#define POST_TRIGGER_BITS 0x2 #define POST_TRIGGER_BITS 0x2
#define DELAY_TRIGGER_BITS 0x3 #define DELAY_TRIGGER_BITS 0x3
#define HW_TRIG_EN 0x10 // enable hardware trigger #define HW_TRIG_EN 0x10 /* enable hardware trigger */
#define FIFO_START_REG 0x6 // software start aquistion trigger #define FIFO_START_REG 0x6 /* software start aquistion trigger */
#define FIFO_RESET_REG 0x8 // clears fifo + fifo flags #define FIFO_RESET_REG 0x8 /* clears fifo + fifo flags */
#define FIFO_DATA_REG 0xa // read data #define FIFO_DATA_REG 0xa /* read data */
#define DMA_TC_CLEAR_REG 0xe // clear dma terminal count interrupt #define DMA_TC_CLEAR_REG 0xe /* clear dma terminal count interrupt */
#define STATUS_REG 0x12 // read only #define STATUS_REG 0x12 /* read only */
#define FNE_BIT 0x1 // fifo not empty #define FNE_BIT 0x1 /* fifo not empty */
#define OVFL_BIT 0x8 // fifo overflow #define OVFL_BIT 0x8 /* fifo overflow */
#define EDAQ_BIT 0x10 // end of aquisition interrupt #define EDAQ_BIT 0x10 /* end of aquisition interrupt */
#define DCAL_BIT 0x20 // offset calibration in progress #define DCAL_BIT 0x20 /* offset calibration in progress */
#define INTR_BIT 0x40 // interrupt has occured #define INTR_BIT 0x40 /* interrupt has occured */
#define DMA_TC_BIT 0x80 // dma terminal count interrupt has occured #define DMA_TC_BIT 0x80 /* dma terminal count interrupt has occured */
#define ID_BITS(x) (((x) >> 8) & 0x3) #define ID_BITS(x) (((x) >> 8) & 0x3)
#define IRQ_DMA_CNTRL_REG 0x12 // write only #define IRQ_DMA_CNTRL_REG 0x12 /* write only */
#define DMA_CHAN_BITS(x) ((x) & 0x7) // sets dma channel #define DMA_CHAN_BITS(x) ((x) & 0x7) /* sets dma channel */
#define DMA_EN_BIT 0x8 // enables dma #define DMA_EN_BIT 0x8 /* enables dma */
#define IRQ_LVL_BITS(x) (((x) & 0xf) << 4) // sets irq level #define IRQ_LVL_BITS(x) (((x) & 0xf) << 4) /* sets irq level */
#define FIFO_INTR_EN_BIT 0x100 // enable fifo interrupts #define FIFO_INTR_EN_BIT 0x100 /* enable fifo interrupts */
#define FIFO_INTR_FHF_BIT 0x200 // interrupt fifo half full #define FIFO_INTR_FHF_BIT 0x200 /* interrupt fifo half full */
#define DMA_INTR_EN_BIT 0x800 // enable interrupt on dma terminal count #define DMA_INTR_EN_BIT 0x800 /* enable interrupt on dma terminal count */
#define DMA_DEM_EN_BIT 0x1000 // enables demand mode dma #define DMA_DEM_EN_BIT 0x1000 /* enables demand mode dma */
#define I8253_BASE_REG 0x14 #define I8253_BASE_REG 0x14
#define I8253_MODE_REG 0x17 #define I8253_MODE_REG 0x17
#define HW_COUNT_DISABLE 0x30 // disable hardware counting of conversions #define HW_COUNT_DISABLE 0x30 /* disable hardware counting of conversions */
struct a2150_board { struct a2150_board {
const char *name; const char *name;
int clock[4]; // master clock periods, in nanoseconds int clock[4]; /* master clock periods, in nanoseconds */
int num_clocks; // number of available master clock speeds int num_clocks; /* number of available master clock speeds */
int ai_speed; // maximum conversion rate in nanoseconds int ai_speed; /* maximum conversion rate in nanoseconds */
}; };
//analog input range /* analog input range */
static const struct comedi_lrange range_a2150 = { static const struct comedi_lrange range_a2150 = {
1, 1,
{ {
...@@ -134,7 +134,7 @@ static const struct comedi_lrange range_a2150 = { ...@@ -134,7 +134,7 @@ static const struct comedi_lrange range_a2150 = {
} }
}; };
// enum must match board indices /* enum must match board indices */
enum { a2150_c, a2150_s }; enum { a2150_c, a2150_s };
static const struct a2150_board a2150_boards[] = { static const struct a2150_board a2150_boards[] = {
{ {
...@@ -159,11 +159,11 @@ static const struct a2150_board a2150_boards[] = { ...@@ -159,11 +159,11 @@ static const struct a2150_board a2150_boards[] = {
struct a2150_private { struct a2150_private {
volatile unsigned int count; /* number of data points left to be taken */ volatile unsigned int count; /* number of data points left to be taken */
unsigned int dma; // dma channel unsigned int dma; /* dma channel */
s16 *dma_buffer; // dma buffer s16 *dma_buffer; /* dma buffer */
unsigned int dma_transfer_size; // size in bytes of dma transfers unsigned int dma_transfer_size; /* size in bytes of dma transfers */
int irq_dma_bits; // irq/dma register bits int irq_dma_bits; /* irq/dma register bits */
int config_bits; // config register bits int config_bits; /* config register bits */
}; };
...@@ -226,7 +226,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG) ...@@ -226,7 +226,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG)
comedi_error(dev, "premature interrupt"); comedi_error(dev, "premature interrupt");
return IRQ_HANDLED; return IRQ_HANDLED;
} }
// initialize async here to make sure s is not NULL /* initialize async here to make sure s is not NULL */
async = s->async; async = s->async;
async->events = 0; async->events = 0;
cmd = &async->cmd; cmd = &async->cmd;
...@@ -258,7 +258,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG) ...@@ -258,7 +258,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG)
* count and address get set correctly */ * count and address get set correctly */
clear_dma_ff(devpriv->dma); clear_dma_ff(devpriv->dma);
// figure out how many points to read /* figure out how many points to read */
max_points = devpriv->dma_transfer_size / sample_size; max_points = devpriv->dma_transfer_size / sample_size;
/* residue is the number of points left to be done on the dma /* residue is the number of points left to be done on the dma
* transfer. It should always be zero at this point unless * transfer. It should always be zero at this point unless
...@@ -269,7 +269,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG) ...@@ -269,7 +269,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG)
if (devpriv->count < num_points && cmd->stop_src == TRIG_COUNT) if (devpriv->count < num_points && cmd->stop_src == TRIG_COUNT)
num_points = devpriv->count; num_points = devpriv->count;
// figure out how many points will be stored next time /* figure out how many points will be stored next time */
leftover = 0; leftover = 0;
if (cmd->stop_src == TRIG_NONE) { if (cmd->stop_src == TRIG_NONE) {
leftover = devpriv->dma_transfer_size / sample_size; leftover = devpriv->dma_transfer_size / sample_size;
...@@ -288,7 +288,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG) ...@@ -288,7 +288,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG)
for (i = 0; i < num_points; i++) { for (i = 0; i < num_points; i++) {
/* write data point to comedi buffer */ /* write data point to comedi buffer */
dpnt = devpriv->dma_buffer[i]; dpnt = devpriv->dma_buffer[i];
// convert from 2's complement to unsigned coding /* convert from 2's complement to unsigned coding */
dpnt ^= 0x8000; dpnt ^= 0x8000;
cfc_write_to_buffer(s, dpnt); cfc_write_to_buffer(s, dpnt);
if (cmd->stop_src == TRIG_COUNT) { if (cmd->stop_src == TRIG_COUNT) {
...@@ -299,7 +299,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG) ...@@ -299,7 +299,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG)
} }
} }
} }
// re-enable dma /* re-enable dma */
if (leftover) { if (leftover) {
set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer)); set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer));
set_dma_count(devpriv->dma, leftover * sample_size); set_dma_count(devpriv->dma, leftover * sample_size);
...@@ -317,7 +317,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG) ...@@ -317,7 +317,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d PT_REGS_ARG)
return IRQ_HANDLED; return IRQ_HANDLED;
} }
// probes board type, returns offset /* probes board type, returns offset */
static int a2150_probe(struct comedi_device * dev) static int a2150_probe(struct comedi_device * dev)
{ {
int status = inw(dev->iobase + STATUS_REG); int status = inw(dev->iobase + STATUS_REG);
...@@ -365,7 +365,7 @@ static int a2150_attach(struct comedi_device * dev, struct comedi_devconfig * it ...@@ -365,7 +365,7 @@ static int a2150_attach(struct comedi_device * dev, struct comedi_devconfig * it
/* grab our IRQ */ /* grab our IRQ */
if (irq) { if (irq) {
// check that irq is supported /* check that irq is supported */
if (irq < 3 || irq == 8 || irq == 13 || irq > 15) { if (irq < 3 || irq == 8 || irq == 13 || irq > 15) {
printk(" invalid irq line %u\n", irq); printk(" invalid irq line %u\n", irq);
return -EINVAL; return -EINVAL;
...@@ -378,7 +378,7 @@ static int a2150_attach(struct comedi_device * dev, struct comedi_devconfig * it ...@@ -378,7 +378,7 @@ static int a2150_attach(struct comedi_device * dev, struct comedi_devconfig * it
devpriv->irq_dma_bits |= IRQ_LVL_BITS(irq); devpriv->irq_dma_bits |= IRQ_LVL_BITS(irq);
dev->irq = irq; dev->irq = irq;
} }
// initialize dma /* initialize dma */
if (dma) { if (dma) {
if (dma == 4 || dma > 7) { if (dma == 4 || dma > 7) {
printk(" invalid dma channel %u\n", dma); printk(" invalid dma channel %u\n", dma);
...@@ -424,16 +424,16 @@ static int a2150_attach(struct comedi_device * dev, struct comedi_devconfig * it ...@@ -424,16 +424,16 @@ static int a2150_attach(struct comedi_device * dev, struct comedi_devconfig * it
* prevent hardware count from stopping aquisition */ * prevent hardware count from stopping aquisition */
outw(HW_COUNT_DISABLE, dev->iobase + I8253_MODE_REG); outw(HW_COUNT_DISABLE, dev->iobase + I8253_MODE_REG);
// set card's irq and dma levels /* set card's irq and dma levels */
outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
// reset and sync adc clock circuitry /* reset and sync adc clock circuitry */
outw_p(DPD_BIT | APD_BIT, dev->iobase + CONFIG_REG); outw_p(DPD_BIT | APD_BIT, dev->iobase + CONFIG_REG);
outw_p(DPD_BIT, dev->iobase + CONFIG_REG); outw_p(DPD_BIT, dev->iobase + CONFIG_REG);
// initialize configuration register /* initialize configuration register */
devpriv->config_bits = 0; devpriv->config_bits = 0;
outw(devpriv->config_bits, dev->iobase + CONFIG_REG); outw(devpriv->config_bits, dev->iobase + CONFIG_REG);
// wait until offset calibration is done, then enable analog inputs /* wait until offset calibration is done, then enable analog inputs */
for (i = 0; i < timeout; i++) { for (i = 0; i < timeout; i++) {
if ((DCAL_BIT & inw(dev->iobase + STATUS_REG)) == 0) if ((DCAL_BIT & inw(dev->iobase + STATUS_REG)) == 0)
break; break;
...@@ -455,7 +455,7 @@ static int a2150_detach(struct comedi_device * dev) ...@@ -455,7 +455,7 @@ static int a2150_detach(struct comedi_device * dev)
/* only free stuff if it has been allocated by _attach */ /* only free stuff if it has been allocated by _attach */
if (dev->iobase) { if (dev->iobase) {
// put board in power-down mode /* put board in power-down mode */
outw(APD_BIT | DPD_BIT, dev->iobase + CONFIG_REG); outw(APD_BIT | DPD_BIT, dev->iobase + CONFIG_REG);
release_region(dev->iobase, A2150_SIZE); release_region(dev->iobase, A2150_SIZE);
} }
...@@ -474,14 +474,14 @@ static int a2150_detach(struct comedi_device * dev) ...@@ -474,14 +474,14 @@ static int a2150_detach(struct comedi_device * dev)
static int a2150_cancel(struct comedi_device * dev, struct comedi_subdevice * s) static int a2150_cancel(struct comedi_device * dev, struct comedi_subdevice * s)
{ {
// disable dma on card /* disable dma on card */
devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT;
outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
// disable computer's dma /* disable computer's dma */
disable_dma(devpriv->dma); disable_dma(devpriv->dma);
// clear fifo and reset triggering circuitry /* clear fifo and reset triggering circuitry */
outw(0, dev->iobase + FIFO_RESET_REG); outw(0, dev->iobase + FIFO_RESET_REG);
return 0; return 0;
...@@ -582,7 +582,7 @@ static int a2150_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice ...@@ -582,7 +582,7 @@ static int a2150_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice
if (err) if (err)
return 4; return 4;
// check channel/gain list against card's limitations /* check channel/gain list against card's limitations */
if (cmd->chanlist) { if (cmd->chanlist) {
startChan = CR_CHAN(cmd->chanlist[0]); startChan = CR_CHAN(cmd->chanlist[0]);
for (i = 1; i < cmd->chanlist_len; i++) { for (i = 1; i < cmd->chanlist_len; i++) {
...@@ -635,7 +635,7 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s) ...@@ -635,7 +635,7 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
" dma incompatible with hard real-time interrupt (TRIG_RT), aborting"); " dma incompatible with hard real-time interrupt (TRIG_RT), aborting");
return -1; return -1;
} }
// clear fifo and reset triggering circuitry /* clear fifo and reset triggering circuitry */
outw(0, dev->iobase + FIFO_RESET_REG); outw(0, dev->iobase + FIFO_RESET_REG);
/* setup chanlist */ /* setup chanlist */
...@@ -643,7 +643,7 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s) ...@@ -643,7 +643,7 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
cmd->chanlist_len) < 0) cmd->chanlist_len) < 0)
return -1; return -1;
// setup ac/dc coupling /* setup ac/dc coupling */
if (CR_AREF(cmd->chanlist[0]) == AREF_OTHER) if (CR_AREF(cmd->chanlist[0]) == AREF_OTHER)
devpriv->config_bits |= AC0_BIT; devpriv->config_bits |= AC0_BIT;
else else
...@@ -653,23 +653,23 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s) ...@@ -653,23 +653,23 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
else else
devpriv->config_bits &= ~AC1_BIT; devpriv->config_bits &= ~AC1_BIT;
// setup timing /* setup timing */
a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags); a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags);
// send timing, channel, config bits /* send timing, channel, config bits */
outw(devpriv->config_bits, dev->iobase + CONFIG_REG); outw(devpriv->config_bits, dev->iobase + CONFIG_REG);
// initialize number of samples remaining /* initialize number of samples remaining */
devpriv->count = cmd->stop_arg * cmd->chanlist_len; devpriv->count = cmd->stop_arg * cmd->chanlist_len;
// enable computer's dma /* enable computer's dma */
lock_flags = claim_dma_lock(); lock_flags = claim_dma_lock();
disable_dma(devpriv->dma); disable_dma(devpriv->dma);
/* clear flip-flop to make sure 2-byte registers for /* clear flip-flop to make sure 2-byte registers for
* count and address get set correctly */ * count and address get set correctly */
clear_dma_ff(devpriv->dma); clear_dma_ff(devpriv->dma);
set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer)); set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer));
// set size of transfer to fill in 1/3 second /* set size of transfer to fill in 1/3 second */
#define ONE_THIRD_SECOND 333333333 #define ONE_THIRD_SECOND 333333333
devpriv->dma_transfer_size = devpriv->dma_transfer_size =
sizeof(devpriv->dma_buffer[0]) * cmd->chanlist_len * sizeof(devpriv->dma_buffer[0]) * cmd->chanlist_len *
...@@ -688,36 +688,36 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s) ...@@ -688,36 +688,36 @@ static int a2150_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
* one spurious interrupt that has been happening */ * one spurious interrupt that has been happening */
outw(0x00, dev->iobase + DMA_TC_CLEAR_REG); outw(0x00, dev->iobase + DMA_TC_CLEAR_REG);
// enable dma on card /* enable dma on card */
devpriv->irq_dma_bits |= DMA_INTR_EN_BIT | DMA_EN_BIT; devpriv->irq_dma_bits |= DMA_INTR_EN_BIT | DMA_EN_BIT;
outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
// may need to wait 72 sampling periods if timing was changed /* may need to wait 72 sampling periods if timing was changed */
i8254_load(dev->iobase + I8253_BASE_REG, 0, 2, 72, 0); i8254_load(dev->iobase + I8253_BASE_REG, 0, 2, 72, 0);
// setup start triggering /* setup start triggering */
trigger_bits = 0; trigger_bits = 0;
// decide if we need to wait 72 periods for valid data /* decide if we need to wait 72 periods for valid data */
if (cmd->start_src == TRIG_NOW && if (cmd->start_src == TRIG_NOW &&
(old_config_bits & CLOCK_MASK) != (old_config_bits & CLOCK_MASK) !=
(devpriv->config_bits & CLOCK_MASK)) { (devpriv->config_bits & CLOCK_MASK)) {
// set trigger source to delay trigger /* set trigger source to delay trigger */
trigger_bits |= DELAY_TRIGGER_BITS; trigger_bits |= DELAY_TRIGGER_BITS;
} else { } else {
// otherwise no delay /* otherwise no delay */
trigger_bits |= POST_TRIGGER_BITS; trigger_bits |= POST_TRIGGER_BITS;
} }
// enable external hardware trigger /* enable external hardware trigger */
if (cmd->start_src == TRIG_EXT) { if (cmd->start_src == TRIG_EXT) {
trigger_bits |= HW_TRIG_EN; trigger_bits |= HW_TRIG_EN;
} else if (cmd->start_src == TRIG_OTHER) { } else if (cmd->start_src == TRIG_OTHER) {
// XXX add support for level/slope start trigger using TRIG_OTHER /* XXX add support for level/slope start trigger using TRIG_OTHER */
comedi_error(dev, "you shouldn't see this?"); comedi_error(dev, "you shouldn't see this?");
} }
// send trigger config bits /* send trigger config bits */
outw(trigger_bits, dev->iobase + TRIGGER_REG); outw(trigger_bits, dev->iobase + TRIGGER_REG);
// start aquisition for soft trigger /* start aquisition for soft trigger */
if (cmd->start_src == TRIG_NOW) { if (cmd->start_src == TRIG_NOW) {
outw(0, dev->iobase + FIFO_START_REG); outw(0, dev->iobase + FIFO_START_REG);
} }
...@@ -735,28 +735,28 @@ static int a2150_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * ...@@ -735,28 +735,28 @@ static int a2150_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice *
static const int timeout = 100000; static const int timeout = 100000;
static const int filter_delay = 36; static const int filter_delay = 36;
// clear fifo and reset triggering circuitry /* clear fifo and reset triggering circuitry */
outw(0, dev->iobase + FIFO_RESET_REG); outw(0, dev->iobase + FIFO_RESET_REG);
/* setup chanlist */ /* setup chanlist */
if (a2150_set_chanlist(dev, CR_CHAN(insn->chanspec), 1) < 0) if (a2150_set_chanlist(dev, CR_CHAN(insn->chanspec), 1) < 0)
return -1; return -1;
// set dc coupling /* set dc coupling */
devpriv->config_bits &= ~AC0_BIT; devpriv->config_bits &= ~AC0_BIT;
devpriv->config_bits &= ~AC1_BIT; devpriv->config_bits &= ~AC1_BIT;
// send timing, channel, config bits /* send timing, channel, config bits */
outw(devpriv->config_bits, dev->iobase + CONFIG_REG); outw(devpriv->config_bits, dev->iobase + CONFIG_REG);
// disable dma on card /* disable dma on card */
devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT;
outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
// setup start triggering /* setup start triggering */
outw(0, dev->iobase + TRIGGER_REG); outw(0, dev->iobase + TRIGGER_REG);
// start aquisition for soft trigger /* start aquisition for soft trigger */
outw(0, dev->iobase + FIFO_START_REG); outw(0, dev->iobase + FIFO_START_REG);
/* there is a 35.6 sample delay for data to get through the antialias filter */ /* there is a 35.6 sample delay for data to get through the antialias filter */
...@@ -773,7 +773,7 @@ static int a2150_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * ...@@ -773,7 +773,7 @@ static int a2150_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice *
inw(dev->iobase + FIFO_DATA_REG); inw(dev->iobase + FIFO_DATA_REG);
} }
// read data /* read data */
for (n = 0; n < insn->n; n++) { for (n = 0; n < insn->n; n++) {
for (i = 0; i < timeout; i++) { for (i = 0; i < timeout; i++) {
if (inw(dev->iobase + STATUS_REG) & FNE_BIT) if (inw(dev->iobase + STATUS_REG) & FNE_BIT)
...@@ -794,7 +794,7 @@ static int a2150_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * ...@@ -794,7 +794,7 @@ static int a2150_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice *
data[n] ^= 0x8000; data[n] ^= 0x8000;
} }
// clear fifo and reset triggering circuitry /* clear fifo and reset triggering circuitry */
outw(0, dev->iobase + FIFO_RESET_REG); outw(0, dev->iobase + FIFO_RESET_REG);
return n; return n;
...@@ -809,7 +809,7 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period, ...@@ -809,7 +809,7 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period,
int lub_divisor_shift, lub_index, glb_divisor_shift, glb_index; int lub_divisor_shift, lub_index, glb_divisor_shift, glb_index;
int i, j; int i, j;
// initialize greatest lower and least upper bounds /* initialize greatest lower and least upper bounds */
lub_divisor_shift = 3; lub_divisor_shift = 3;
lub_index = 0; lub_index = 0;
lub = thisboard->clock[lub_index] * (1 << lub_divisor_shift); lub = thisboard->clock[lub_index] * (1 << lub_divisor_shift);
...@@ -817,19 +817,19 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period, ...@@ -817,19 +817,19 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period,
glb_index = thisboard->num_clocks - 1; glb_index = thisboard->num_clocks - 1;
glb = thisboard->clock[glb_index] * (1 << glb_divisor_shift); glb = thisboard->clock[glb_index] * (1 << glb_divisor_shift);
// make sure period is in available range /* make sure period is in available range */
if (*period < glb) if (*period < glb)
*period = glb; *period = glb;
if (*period > lub) if (*period > lub)
*period = lub; *period = lub;
// we can multiply period by 1, 2, 4, or 8, using (1 << i) /* we can multiply period by 1, 2, 4, or 8, using (1 << i) */
for (i = 0; i < 4; i++) { for (i = 0; i < 4; i++) {
// there are a maximum of 4 master clocks /* there are a maximum of 4 master clocks */
for (j = 0; j < thisboard->num_clocks; j++) { for (j = 0; j < thisboard->num_clocks; j++) {
// temp is the period in nanosec we are evaluating /* temp is the period in nanosec we are evaluating */
temp = thisboard->clock[j] * (1 << i); temp = thisboard->clock[j] * (1 << i);
// if it is the best match yet /* if it is the best match yet */
if (temp < lub && temp >= *period) { if (temp < lub && temp >= *period) {
lub_divisor_shift = i; lub_divisor_shift = i;
lub_index = j; lub_index = j;
...@@ -846,7 +846,7 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period, ...@@ -846,7 +846,7 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period,
switch (flags) { switch (flags) {
case TRIG_ROUND_NEAREST: case TRIG_ROUND_NEAREST:
default: default:
// if least upper bound is better approximation /* if least upper bound is better approximation */
if (lub - *period < *period - glb) { if (lub - *period < *period - glb) {
*period = lub; *period = lub;
} else { } else {
...@@ -861,7 +861,7 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period, ...@@ -861,7 +861,7 @@ static int a2150_get_timing(struct comedi_device * dev, unsigned int *period,
break; break;
} }
// set clock bits for config register appropriately /* set clock bits for config register appropriately */
devpriv->config_bits &= ~CLOCK_MASK; devpriv->config_bits &= ~CLOCK_MASK;
if (*period == lub) { if (*period == lub) {
devpriv->config_bits |= devpriv->config_bits |=
......
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