The minimum convert time 'ai_ns_min' is based on the sampling rate of the A/D
converter. This driver supports boards that use different ADC chips for 16-bit
and 12-bit analog inputs. These chips have different sampling rates.
For aesthetics, move the 'ai_ns_min' member from the boardinfo to the private
data. Initialize the member during the attach based on the 'maxdata' of the
analog inputs.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/adl_pci9118.c | 40 +++++++++++++++++-----------
1 file changed, 25 insertions(+), 15 deletions(-)
diff --git a/drivers/staging/comedi/drivers/adl_pci9118.c b/drivers/staging/comedi/drivers/adl_pci9118.c
index 3d25753..3e83b21 100644
--- a/drivers/staging/comedi/drivers/adl_pci9118.c
+++ b/drivers/staging/comedi/drivers/adl_pci9118.c
@@ -233,7 +233,6 @@ struct boardtype {
int device_id; /* PCI device ID of card */
int ai_maxdata; /* resolution of A/D */
const struct comedi_lrange *rangelist_ai; /* rangelist for A/D */
- unsigned int ai_ns_min; /* max sample speed of card v ns */
unsigned int ai_pacer_min; /*
* minimal pacer value
* (c1*c2 or c1 in burst)
@@ -246,21 +245,18 @@ static const struct boardtype boardtypes[] = {
.device_id = 0x80d9,
.ai_maxdata = 0x0fff,
.rangelist_ai = &range_pci9118dg_hr,
- .ai_ns_min = 3000,
.ai_pacer_min = 12,
}, {
.name = "pci9118hg",
.device_id = 0x80d9,
.ai_maxdata = 0x0fff,
.rangelist_ai = &range_pci9118hg,
- .ai_ns_min = 3000,
.ai_pacer_min = 12,
}, {
.name = "pci9118hr",
.device_id = 0x80d9,
.ai_maxdata = 0xffff,
.rangelist_ai = &range_pci9118dg_hr,
- .ai_ns_min = 10000,
.ai_pacer_min = 40,
},
};
@@ -341,6 +337,7 @@ struct pci9118_private {
*/
unsigned int ai_maskerr; /* which warning was printed */
unsigned int ai_maskharderr; /* on which error bits stops */
+ unsigned int ai_ns_min;
};
static int check_channel_list(struct comedi_device *dev,
@@ -709,20 +706,21 @@ static void pci9118_calc_divisors(char mode, struct comedi_device *dev,
unsigned int chnsshfront)
{
const struct boardtype *this_board = comedi_board(dev);
+ struct pci9118_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
switch (mode) {
case 1:
case 4:
- if (*tim2 < this_board->ai_ns_min)
- *tim2 = this_board->ai_ns_min;
+ if (*tim2 < devpriv->ai_ns_min)
+ *tim2 = devpriv->ai_ns_min;
i8253_cascade_ns_to_timer(I8254_OSC_BASE_4MHZ,
div1, div2,
tim2, flags & CMDF_ROUND_NEAREST);
break;
case 2:
- if (*tim2 < this_board->ai_ns_min)
- *tim2 = this_board->ai_ns_min;
+ if (*tim2 < devpriv->ai_ns_min)
+ *tim2 = devpriv->ai_ns_min;
*div1 = *tim2 / I8254_OSC_BASE_4MHZ;
/* convert timer (burst) */
if (*div1 < this_board->ai_pacer_min)
@@ -1072,7 +1070,6 @@ static int pci9118_ai_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
- const struct boardtype *this_board = comedi_board(dev);
struct pci9118_private *devpriv = dev->private;
int err = 0;
unsigned int flags;
@@ -1154,7 +1151,7 @@ static int pci9118_ai_cmdtest(struct comedi_device *dev,
if (cmd->scan_begin_src == TRIG_TIMER)
err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
- this_board->ai_ns_min);
+ devpriv->ai_ns_min);
if (cmd->scan_begin_src == TRIG_EXT)
if (cmd->scan_begin_arg) {
@@ -1166,7 +1163,7 @@ static int pci9118_ai_cmdtest(struct comedi_device *dev,
if (cmd->convert_src & (TRIG_TIMER | TRIG_NOW))
err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
- this_board->ai_ns_min);
+ devpriv->ai_ns_min);
if (cmd->convert_src == TRIG_EXT)
err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
@@ -1210,7 +1207,7 @@ static int pci9118_ai_cmdtest(struct comedi_device *dev,
if (cmd->scan_begin_src == TRIG_TIMER &&
cmd->convert_src == TRIG_NOW) {
if (cmd->convert_arg == 0) {
- arg = this_board->ai_ns_min *
+ arg = devpriv->ai_ns_min *
(cmd->scan_end_arg + 2);
} else {
arg = cmd->convert_arg * cmd->chanlist_len;
@@ -1491,7 +1488,6 @@ static int pci9118_ai_docmd_dma(struct comedi_device *dev,
static int pci9118_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
- const struct boardtype *this_board = comedi_board(dev);
struct pci9118_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
unsigned int addchans = 0;
@@ -1569,8 +1565,8 @@ static int pci9118_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
devpriv->ai_add_front++;
devpriv->ai_add_back = 0;
}
- if (cmd->convert_arg < this_board->ai_ns_min)
- cmd->convert_arg = this_board->ai_ns_min;
+ if (cmd->convert_arg < devpriv->ai_ns_min)
+ cmd->convert_arg = devpriv->ai_ns_min;
addchans = devpriv->softsshdelay / cmd->convert_arg;
if (devpriv->softsshdelay % cmd->convert_arg)
addchans++;
@@ -1896,6 +1892,20 @@ static int pci9118_common_attach(struct comedi_device *dev, int disable_irq,
s->munge = pci9118_ai_munge;
}
+ if (s->maxdata == 0xffff) {
+ /*
+ * 16-bit samples are from an ADS7805 A/D converter.
+ * Minimum sampling rate is 10us.
+ */
+ devpriv->ai_ns_min = 10000;
+ } else {
+ /*
+ * 12-bit samples are from an ADS7800 A/D converter.
+ * Minimum sampling rate is 3us.
+ */
+ devpriv->ai_ns_min = 3000;
+ }
+
s = &dev->subdevices[1];
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_COMMON;
--
2.0.3
_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
