diff options
author | Bill Pemberton <wfp5p@virginia.edu> | 2009-03-27 11:29:40 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-06-19 11:00:28 -0700 |
commit | a351ecf3081f94796cf915dba820f9f5e62c43cf (patch) | |
tree | 1439c3d6b71889847d8f2601a9710cd282dd4b26 /drivers/staging/comedi | |
parent | cf0fd1086cbb55fb5c0ecbd652fec34335fb7657 (diff) |
Staging: comedi: remove C99 comments in das1800.c
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/comedi')
-rw-r--r-- | drivers/staging/comedi/drivers/das1800.c | 204 |
1 files changed, 102 insertions, 102 deletions
diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c index cd4cd4e6a79..60724600607 100644 --- a/drivers/staging/comedi/drivers/das1800.c +++ b/drivers/staging/comedi/drivers/das1800.c @@ -108,12 +108,12 @@ TODO: #include "8253.h" #include "comedi_fc.h" -// misc. defines -#define DAS1800_SIZE 16 //uses 16 io addresses -#define FIFO_SIZE 1024 // 1024 sample fifo -#define TIMER_BASE 200 // 5 Mhz master clock -#define UNIPOLAR 0x4 // bit that determines whether input range is uni/bipolar -#define DMA_BUF_SIZE 0x1ff00 // size in bytes of dma buffers +/* misc. defines */ +#define DAS1800_SIZE 16 /* uses 16 io addresses */ +#define FIFO_SIZE 1024 /* 1024 sample fifo */ +#define TIMER_BASE 200 /* 5 Mhz master clock */ +#define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */ +#define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */ /* Registers for the das1800 */ #define DAS1800_FIFO 0x0 @@ -138,7 +138,7 @@ TODO: #define DMA_CH5_CH6 0x5 #define DMA_CH6_CH7 0x6 #define DMA_CH7_CH5 0x7 -#define DMA_ENABLED 0x3 //mask used to determine if dma is enabled +#define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */ #define DMA_DUAL 0x4 #define IRQ3 0x8 #define IRQ5 0x10 @@ -156,7 +156,7 @@ TODO: #define SD 0x40 #define UB 0x80 #define DAS1800_STATUS 0x7 -// bits that prevent interrupt status bits (and CVEN) from being cleared on write +/* bits that prevent interrupt status bits (and CVEN) from being cleared on write */ #define CLEAR_INTR_MASK (CVEN_MASK | 0x1f) #define INT 0x1 #define DMATC 0x2 @@ -164,14 +164,14 @@ TODO: #define OVF 0x10 #define FHF 0x20 #define FNE 0x40 -#define CVEN_MASK 0x40 // masks CVEN on write +#define CVEN_MASK 0x40 /* masks CVEN on write */ #define CVEN 0x80 #define DAS1800_BURST_LENGTH 0x8 #define DAS1800_BURST_RATE 0x9 #define DAS1800_QRAM_ADDRESS 0xa #define DAS1800_COUNTER 0xc -#define IOBASE2 0x400 //offset of additional ioports used on 'ao' cards +#define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */ enum { das1701st, das1701st_da, das1702st, das1702st_da, das1702hr, @@ -212,7 +212,7 @@ static int das1800_set_frequency(struct comedi_device * dev); static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode); static unsigned int suggest_transfer_size(struct comedi_cmd * cmd); -// analog input ranges +/* analog input ranges */ static const struct comedi_lrange range_ai_das1801 = { 8, { @@ -485,7 +485,7 @@ struct das1800_private { #define devpriv ((struct das1800_private *)dev->private) -// analog out range for boards with basic analog out +/* analog out range for boards with basic analog out */ static const struct comedi_lrange range_ao_1 = { 1, { @@ -493,7 +493,7 @@ static const struct comedi_lrange range_ao_1 = { } }; -// analog out range for 'ao' boards +/* analog out range for 'ao' boards */ /* static const struct comedi_lrange range_ao_2 = { 2, @@ -525,26 +525,26 @@ static int das1800_init_dma(struct comedi_device * dev, unsigned int dma0, { unsigned long flags; - // need an irq to do dma + /* need an irq to do dma */ if (dev->irq && dma0) { - //encode dma0 and dma1 into 2 digit hexadecimal for switch + /* encode dma0 and dma1 into 2 digit hexadecimal for switch */ switch ((dma0 & 0x7) | (dma1 << 4)) { - case 0x5: // dma0 == 5 + case 0x5: /* dma0 == 5 */ devpriv->dma_bits |= DMA_CH5; break; - case 0x6: // dma0 == 6 + case 0x6: /* dma0 == 6 */ devpriv->dma_bits |= DMA_CH6; break; - case 0x7: // dma0 == 7 + case 0x7: /* dma0 == 7 */ devpriv->dma_bits |= DMA_CH7; break; - case 0x65: // dma0 == 5, dma1 == 6 + case 0x65: /* dma0 == 5, dma1 == 6 */ devpriv->dma_bits |= DMA_CH5_CH6; break; - case 0x76: // dma0 == 6, dma1 == 7 + case 0x76: /* dma0 == 6, dma1 == 7 */ devpriv->dma_bits |= DMA_CH6_CH7; break; - case 0x57: // dma0 == 7, dma1 == 5 + case 0x57: /* dma0 == 7, dma1 == 5 */ devpriv->dma_bits |= DMA_CH7_CH5; break; default: @@ -638,7 +638,7 @@ static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig * dev->board_ptr = das1800_boards + board; dev->board_name = thisboard->name; - // if it is an 'ao' board with fancy analog out then we need extra io ports + /* if it is an 'ao' board with fancy analog out then we need extra io ports */ if (thisboard->ao_ability == 2) { iobase2 = iobase + IOBASE2; if (!request_region(iobase2, DAS1800_SIZE, @@ -659,7 +659,7 @@ static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig * } dev->irq = irq; - // set bits that tell card which irq to use + /* set bits that tell card which irq to use */ switch (irq) { case 0: break; @@ -751,12 +751,12 @@ static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig * das1800_cancel(dev, dev->read_subdev); - // initialize digital out channels + /* initialize digital out channels */ outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); - // initialize analog out channels + /* initialize analog out channels */ if (thisboard->ao_ability == 1) { - // select 'update' dac channel for baseAddress + 0x0 + /* select 'update' dac channel for baseAddress + 0x0 */ outb(DAC(thisboard->ao_n_chan - 1), dev->iobase + DAS1800_SELECT); outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); @@ -871,7 +871,7 @@ static int das1800_ai_poll(struct comedi_device * dev, struct comedi_subdevice * { unsigned long flags; - // prevent race with interrupt handler + /* prevent race with interrupt handler */ comedi_spin_lock_irqsave(&dev->spinlock, flags); das1800_ai_handler(dev); comedi_spin_unlock_irqrestore(&dev->spinlock, flags); @@ -901,14 +901,14 @@ static irqreturn_t das1800_interrupt(int irq, void *d PT_REGS_ARG) } /* clear the interrupt status bit INT */ outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS); - // handle interrupt + /* handle interrupt */ das1800_ai_handler(dev); spin_unlock(&dev->spinlock); return IRQ_HANDLED; } -// the guts of the interrupt handler, that is shared with das1800_ai_poll +/* the guts of the interrupt handler, that is shared with das1800_ai_poll */ static void das1800_ai_handler(struct comedi_device * dev) { struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */ @@ -917,22 +917,22 @@ static void das1800_ai_handler(struct comedi_device * dev) unsigned int status = inb(dev->iobase + DAS1800_STATUS); async->events = 0; - // select adc for base address + 0 + /* select adc for base address + 0 */ outb(ADC, dev->iobase + DAS1800_SELECT); - // dma buffer full + /* dma buffer full */ if (devpriv->irq_dma_bits & DMA_ENABLED) { - // look for data from dma transfer even if dma terminal count hasn't happened yet + /* look for data from dma transfer even if dma terminal count hasn't happened yet */ das1800_handle_dma(dev, s, status); - } else if (status & FHF) { // if fifo half full + } else if (status & FHF) { /* if fifo half full */ das1800_handle_fifo_half_full(dev, s); - } else if (status & FNE) { // if fifo not empty + } else if (status & FNE) { /* if fifo not empty */ das1800_handle_fifo_not_empty(dev, s); } async->events |= COMEDI_CB_BLOCK; /* if the card's fifo has overflowed */ if (status & OVF) { - // clear OVF interrupt bit + /* clear OVF interrupt bit */ outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS); comedi_error(dev, "DAS1800 FIFO overflow"); das1800_cancel(dev, s); @@ -940,19 +940,19 @@ static void das1800_ai_handler(struct comedi_device * dev) comedi_event(dev, s); return; } - // stop taking data if appropriate + /* stop taking data if appropriate */ /* stop_src TRIG_EXT */ if (status & CT0TC) { - // clear CT0TC interrupt bit + /* clear CT0TC interrupt bit */ outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS); - // make sure we get all remaining data from board before quitting + /* make sure we get all remaining data from board before quitting */ if (devpriv->irq_dma_bits & DMA_ENABLED) das1800_flush_dma(dev, s); else das1800_handle_fifo_not_empty(dev, s); das1800_cancel(dev, s); /* disable hardware conversions */ async->events |= COMEDI_CB_EOA; - } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { // stop_src TRIG_COUNT + } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */ das1800_cancel(dev, s); /* disable hardware conversions */ async->events |= COMEDI_CB_EOA; } @@ -971,7 +971,7 @@ static void das1800_handle_dma(struct comedi_device * dev, struct comedi_subdevi flags = claim_dma_lock(); das1800_flush_dma_channel(dev, s, devpriv->dma_current, devpriv->dma_current_buf); - // re-enable dma channel + /* re-enable dma channel */ set_dma_addr(devpriv->dma_current, virt_to_bus(devpriv->dma_current_buf)); set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size); @@ -979,11 +979,11 @@ static void das1800_handle_dma(struct comedi_device * dev, struct comedi_subdevi release_dma_lock(flags); if (status & DMATC) { - // clear DMATC interrupt bit + /* clear DMATC interrupt bit */ outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS); - // switch dma channels for next time, if appropriate + /* switch dma channels for next time, if appropriate */ if (dual_dma) { - // read data from the other channel next time + /* read data from the other channel next time */ if (devpriv->dma_current == devpriv->dma0) { devpriv->dma_current = devpriv->dma1; devpriv->dma_current_buf = devpriv->ai_buf1; @@ -1035,7 +1035,7 @@ static void das1800_flush_dma_channel(struct comedi_device * dev, struct comedi_ * get set correctly */ clear_dma_ff(channel); - // figure out how many points to read + /* figure out how many points to read */ num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel); num_samples = num_bytes / sizeof(short); @@ -1063,7 +1063,7 @@ static void das1800_flush_dma(struct comedi_device * dev, struct comedi_subdevic devpriv->dma_current_buf); if (dual_dma) { - // switch to other channel and flush it + /* switch to other channel and flush it */ if (devpriv->dma_current == devpriv->dma0) { devpriv->dma_current = devpriv->dma1; devpriv->dma_current_buf = devpriv->ai_buf1; @@ -1077,7 +1077,7 @@ static void das1800_flush_dma(struct comedi_device * dev, struct comedi_subdevic release_dma_lock(flags); - // get any remaining samples in fifo + /* get any remaining samples in fifo */ das1800_handle_fifo_not_empty(dev, s); return; @@ -1180,7 +1180,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde /* step 2: make sure trigger sources are unique and mutually compatible */ - // uniqueness check + /* uniqueness check */ if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) err++; if (cmd->scan_begin_src != TRIG_FOLLOW && @@ -1192,7 +1192,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT) err++; - //compatibility check + /* compatibility check */ if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_TIMER) err++; @@ -1244,7 +1244,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde /* step 4: fix up any arguments */ if (cmd->convert_src == TRIG_TIMER) { - // if we are not in burst mode + /* if we are not in burst mode */ if (cmd->scan_begin_src == TRIG_FOLLOW) { tmp_arg = cmd->convert_arg; /* calculate counter values that give desired timing */ @@ -1255,9 +1255,9 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde if (tmp_arg != cmd->convert_arg) err++; } - // if we are in burst mode + /* if we are in burst mode */ else { - // check that convert_arg is compatible + /* check that convert_arg is compatible */ tmp_arg = cmd->convert_arg; cmd->convert_arg = burst_convert_arg(cmd->convert_arg, @@ -1266,7 +1266,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde err++; if (cmd->scan_begin_src == TRIG_TIMER) { - // if scans are timed faster than conversion rate allows + /* if scans are timed faster than conversion rate allows */ if (cmd->convert_arg * cmd->chanlist_len > cmd->scan_begin_arg) { cmd->scan_begin_arg = @@ -1290,7 +1290,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde if (err) return 4; - // make sure user is not trying to mix unipolar and bipolar ranges + /* make sure user is not trying to mix unipolar and bipolar ranges */ if (cmd->chanlist) { unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; for (i = 1; i < cmd->chanlist_len; i++) { @@ -1311,14 +1311,14 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde /* analog input cmd interface */ -// first, some utility functions used in the main ai_do_cmd() +/* first, some utility functions used in the main ai_do_cmd() */ -// returns appropriate bits for control register a, depending on command +/* returns appropriate bits for control register a, depending on command */ static int control_a_bits(struct comedi_cmd cmd) { int control_a; - control_a = FFEN; //enable fifo + control_a = FFEN; /* enable fifo */ if (cmd.stop_src == TRIG_EXT) { control_a |= ATEN; } @@ -1336,7 +1336,7 @@ static int control_a_bits(struct comedi_cmd cmd) return control_a; } -// returns appropriate bits for control register c, depending on command +/* returns appropriate bits for control register c, depending on command */ static int control_c_bits(struct comedi_cmd cmd) { int control_c; @@ -1346,7 +1346,7 @@ static int control_c_bits(struct comedi_cmd cmd) * select unipolar / bipolar */ aref = CR_AREF(cmd.chanlist[0]); - control_c = UQEN; //enable upper qram addresses + control_c = UQEN; /* enable upper qram addresses */ if (aref != AREF_DIFF) control_c |= SD; if (aref == AREF_COMMON) @@ -1355,7 +1355,7 @@ static int control_c_bits(struct comedi_cmd cmd) if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR) control_c |= UB; switch (cmd.scan_begin_src) { - case TRIG_FOLLOW: // not in burst mode + case TRIG_FOLLOW: /* not in burst mode */ switch (cmd.convert_src) { case TRIG_TIMER: /* trig on cascaded counters */ @@ -1370,11 +1370,11 @@ static int control_c_bits(struct comedi_cmd cmd) } break; case TRIG_TIMER: - // burst mode with internal pacer clock + /* burst mode with internal pacer clock */ control_c |= BMDE | IPCLK; break; case TRIG_EXT: - // burst mode with external trigger + /* burst mode with external trigger */ control_c |= BMDE | XPCLK; break; default: @@ -1384,12 +1384,12 @@ static int control_c_bits(struct comedi_cmd cmd) return control_c; } -// sets up counters +/* sets up counters */ static int setup_counters(struct comedi_device * dev, struct comedi_cmd cmd) { - // setup cascaded counters for conversion/scan frequency + /* setup cascaded counters for conversion/scan frequency */ switch (cmd.scan_begin_src) { - case TRIG_FOLLOW: // not in burst mode + case TRIG_FOLLOW: /* not in burst mode */ if (cmd.convert_src == TRIG_TIMER) { /* set conversion frequency */ i8253_cascade_ns_to_timer_2div(TIMER_BASE, @@ -1401,7 +1401,7 @@ static int setup_counters(struct comedi_device * dev, struct comedi_cmd cmd) } } break; - case TRIG_TIMER: // in burst mode + case TRIG_TIMER: /* in burst mode */ /* set scan frequency */ i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), &(devpriv->divisor2), &(cmd.scan_begin_arg), @@ -1414,16 +1414,16 @@ static int setup_counters(struct comedi_device * dev, struct comedi_cmd cmd) break; } - // setup counter 0 for 'about triggering' + /* setup counter 0 for 'about triggering' */ if (cmd.stop_src == TRIG_EXT) { - // load counter 0 in mode 0 + /* load counter 0 in mode 0 */ i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0); } return 0; } -// sets up dma +/* sets up dma */ static void setup_dma(struct comedi_device * dev, struct comedi_cmd cmd) { unsigned long lock_flags; @@ -1440,19 +1440,19 @@ static void setup_dma(struct comedi_device * dev, struct comedi_cmd cmd) * count and address get set correctly */ clear_dma_ff(devpriv->dma0); set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0)); - // set appropriate size of transfer + /* set appropriate size of transfer */ set_dma_count(devpriv->dma0, devpriv->dma_transfer_size); devpriv->dma_current = devpriv->dma0; devpriv->dma_current_buf = devpriv->ai_buf0; enable_dma(devpriv->dma0); - // set up dual dma if appropriate + /* set up dual dma if appropriate */ if (dual_dma) { disable_dma(devpriv->dma1); /* clear flip-flop to make sure 2-byte registers for * count and address get set correctly */ clear_dma_ff(devpriv->dma1); set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1)); - // set appropriate size of transfer + /* set appropriate size of transfer */ set_dma_count(devpriv->dma1, devpriv->dma_transfer_size); enable_dma(devpriv->dma1); } @@ -1461,16 +1461,16 @@ static void setup_dma(struct comedi_device * dev, struct comedi_cmd cmd) return; } -// programs channel/gain list into card +/* programs channel/gain list into card */ static void program_chanlist(struct comedi_device * dev, struct comedi_cmd cmd) { int i, n, chan_range; unsigned long irq_flags; - const int range_mask = 0x3; //masks unipolar/bipolar bit off range + const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */ const int range_bitshift = 8; n = cmd.chanlist_len; - // spinlock protects indirect addressing + /* spinlock protects indirect addressing */ comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */ @@ -1488,7 +1488,7 @@ static void program_chanlist(struct comedi_device * dev, struct comedi_cmd cmd) return; } -// analog input do_cmd +/* analog input do_cmd */ static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice * s) { int ret; @@ -1509,22 +1509,22 @@ static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice } else { devpriv->irq_dma_bits |= devpriv->dma_bits; } - // interrupt on end of conversion for TRIG_WAKE_EOS + /* interrupt on end of conversion for TRIG_WAKE_EOS */ if (cmd.flags & TRIG_WAKE_EOS) { - // interrupt fifo not empty + /* interrupt fifo not empty */ devpriv->irq_dma_bits &= ~FIMD; } else { - // interrupt fifo half full + /* interrupt fifo half full */ devpriv->irq_dma_bits |= FIMD; } - // determine how many conversions we need + /* determine how many conversions we need */ if (cmd.stop_src == TRIG_COUNT) { devpriv->count = cmd.stop_arg * cmd.chanlist_len; } das1800_cancel(dev, s); - // determine proper bits for control registers + /* determine proper bits for control registers */ control_a = control_a_bits(cmd); control_c = control_c_bits(cmd); @@ -1537,14 +1537,14 @@ static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice } setup_dma(dev, cmd); outb(control_c, dev->iobase + DAS1800_CONTROL_C); - // set conversion rate and length for burst mode + /* set conversion rate and length for burst mode */ if (control_c & BMDE) { - // program conversion period with number of microseconds minus 1 + /* program conversion period with number of microseconds minus 1 */ outb(cmd.convert_arg / 1000 - 1, dev->iobase + DAS1800_BURST_RATE); outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH); } - outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); // enable irq/dma + outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */ outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */ outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ @@ -1616,21 +1616,21 @@ static int das1800_ao_winsn(struct comedi_device * dev, struct comedi_subdevice struct comedi_insn * insn, unsigned int * data) { int chan = CR_CHAN(insn->chanspec); -// int range = CR_RANGE(insn->chanspec); +/* int range = CR_RANGE(insn->chanspec); */ int update_chan = thisboard->ao_n_chan - 1; short output; unsigned long irq_flags; - // card expects two's complement data + /* card expects two's complement data */ output = data[0] - (1 << (thisboard->resolution - 1)); - // if the write is to the 'update' channel, we need to remember its value + /* if the write is to the 'update' channel, we need to remember its value */ if (chan == update_chan) devpriv->ao_update_bits = output; - // write to channel + /* write to channel */ comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */ outw(output, dev->iobase + DAS1800_DAC); - // now we need to write to 'update' channel to update all dac channels + /* now we need to write to 'update' channel to update all dac channels */ if (chan != update_chan) { outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */ outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); @@ -1657,7 +1657,7 @@ static int das1800_do_wbits(struct comedi_device * dev, struct comedi_subdevice { unsigned int wbits; - // only set bits that have been masked + /* only set bits that have been masked */ data[0] &= (1 << s->n_chan) - 1; wbits = devpriv->do_bits; wbits &= ~data[0]; @@ -1676,11 +1676,11 @@ static int das1800_set_frequency(struct comedi_device * dev) { int err = 0; - // counter 1, mode 2 + /* counter 1, mode 2 */ if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1, 2)) err++; - // counter 2, mode 2 + /* counter 2, mode 2 */ if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2, 2)) err++; @@ -1697,11 +1697,11 @@ static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) { unsigned int micro_sec; - // in burst mode, the maximum conversion time is 64 microseconds + /* in burst mode, the maximum conversion time is 64 microseconds */ if (convert_arg > 64000) convert_arg = 64000; - // the conversion time must be an integral number of microseconds + /* the conversion time must be an integral number of microseconds */ switch (round_mode) { case TRIG_ROUND_NEAREST: default: @@ -1715,21 +1715,21 @@ static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) break; } - // return number of nanoseconds + /* return number of nanoseconds */ return micro_sec * 1000; } -// utility function that suggests a dma transfer size based on the conversion period 'ns' +/* utility function that suggests a dma transfer size based on the conversion period 'ns' */ static unsigned int suggest_transfer_size(struct comedi_cmd * cmd) { unsigned int size = DMA_BUF_SIZE; - static const int sample_size = 2; // size in bytes of one sample from board - unsigned int fill_time = 300000000; // target time in nanoseconds for filling dma buffer - unsigned int max_size; // maximum size we will allow for a transfer + static const int sample_size = 2; /* size in bytes of one sample from board */ + unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */ + unsigned int max_size; /* maximum size we will allow for a transfer */ - // make dma buffer fill in 0.3 seconds for timed modes + /* make dma buffer fill in 0.3 seconds for timed modes */ switch (cmd->scan_begin_src) { - case TRIG_FOLLOW: // not in burst mode + case TRIG_FOLLOW: /* not in burst mode */ if (cmd->convert_src == TRIG_TIMER) size = (fill_time / cmd->convert_arg) * sample_size; break; @@ -1742,9 +1742,9 @@ static unsigned int suggest_transfer_size(struct comedi_cmd * cmd) break; } - // set a minimum and maximum size allowed + /* set a minimum and maximum size allowed */ max_size = DMA_BUF_SIZE; - // if we are taking limited number of conversions, limit transfer size to that + /* if we are taking limited number of conversions, limit transfer size to that */ if (cmd->stop_src == TRIG_COUNT && cmd->stop_arg * cmd->chanlist_len * sample_size < max_size) max_size = cmd->stop_arg * cmd->chanlist_len * sample_size; |