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staging: comedi: ni_mio_common: protect register write overflow

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Fixes two problems introduced as early as
commit 03aef4b6dc  ("Staging: comedi: add ni_mio_common code"):
(1) Ensures that the last four bits of NISTC_RTSI_TRIGB_OUT_REG register is
    not unduly overwritten on e-series devices.  On e-series devices, the
    first three of the last four bits are reserved.  The last bit defines
    the output selection of the RGOUT0 pin, otherwise known as
    RTSI_Sub_Selection.  For m-series devices, these last four bits are
    indeed used as the output selection of the RTSI7 pin (and the
    RTSI_Sub_Selection bit for the RGOUT0 pin is moved to the
    RTSI_Trig_Direction register.
(2) Allows all 4 RTSI_BRD lines to be treated as valid sources for RTSI
    lines.

This patch also cleans up the ni_get_rtsi_routing command for readability.

Fixes: 03aef4b6dc  ("Staging: comedi: add ni_mio_common code")
Signed-off-by: Spencer E. Olson <olsonse@umich.edu>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Spencer E. Olson 2018-10-03 14:54:16 -06:00 committed by Greg Kroah-Hartman
parent 0f80b1c9f4
commit 1cbca5852d
1 changed files with 17 additions and 7 deletions
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24
drivers/staging/comedi/drivers/ni_mio_common.c
View file

@ -4980,7 +4980,10 @@ static int ni_valid_rtsi_output_source(struct comedi_device *dev,
case NI_RTSI_OUTPUT_G_SRC0:
case NI_RTSI_OUTPUT_G_GATE0:
case NI_RTSI_OUTPUT_RGOUT0:
case NI_RTSI_OUTPUT_RTSI_BRD_0:
case NI_RTSI_OUTPUT_RTSI_BRD(0):
case NI_RTSI_OUTPUT_RTSI_BRD(1):
case NI_RTSI_OUTPUT_RTSI_BRD(2):
case NI_RTSI_OUTPUT_RTSI_BRD(3):
return 1;
case NI_RTSI_OUTPUT_RTSI_OSC:
return (devpriv->is_m_series) ? 1 : 0;
@ -5001,11 +5004,18 @@ static int ni_set_rtsi_routing(struct comedi_device *dev,
devpriv->rtsi_trig_a_output_reg |= NISTC_RTSI_TRIG(chan, src);
ni_stc_writew(dev, devpriv->rtsi_trig_a_output_reg,
NISTC_RTSI_TRIGA_OUT_REG);
} else if (chan < 8) {
} else if (chan < NISTC_RTSI_TRIG_NUM_CHAN(devpriv->is_m_series)) {
devpriv->rtsi_trig_b_output_reg &= ~NISTC_RTSI_TRIG_MASK(chan);
devpriv->rtsi_trig_b_output_reg |= NISTC_RTSI_TRIG(chan, src);
ni_stc_writew(dev, devpriv->rtsi_trig_b_output_reg,
NISTC_RTSI_TRIGB_OUT_REG);
} else if (chan != NISTC_RTSI_TRIG_OLD_CLK_CHAN) {
/* probably should never reach this, since the
* ni_valid_rtsi_output_source above errors out if chan is too
* high
*/
dev_err(dev->class_dev, "%s: unknown rtsi channel\n", __func__);
return -EINVAL;
}
return 2;
}
@ -5021,12 +5031,12 @@ static unsigned int ni_get_rtsi_routing(struct comedi_device *dev,
} else if (chan < NISTC_RTSI_TRIG_NUM_CHAN(devpriv->is_m_series)) {
return NISTC_RTSI_TRIG_TO_SRC(chan,
devpriv->rtsi_trig_b_output_reg);
} else {
if (chan == NISTC_RTSI_TRIG_OLD_CLK_CHAN)
return NI_RTSI_OUTPUT_RTSI_OSC;
dev_err(dev->class_dev, "bug! should never get here?\n");
return 0;
} else if (chan == NISTC_RTSI_TRIG_OLD_CLK_CHAN) {
return NI_RTSI_OUTPUT_RTSI_OSC;
}
dev_err(dev->class_dev, "%s: unknown rtsi channel\n", __func__);
return -EINVAL;
}
static int ni_rtsi_insn_config(struct comedi_device *dev,