From c9e5ec256c7af7f1558290b66dd145326c403a18 Mon Sep 17 00:00:00 2001 From: Andrzej Pietrasiewicz Date: Sat, 14 Nov 2015 19:19:10 +0100 Subject: [PATCH] staging: comedi: ni_mio_common: add "no_channel" versions of some functions ni_release_ai_mite_channel(), ni_release_ao_mite_channel(), ni_release_gpct_mite_channel() and ni_release_cdo_mite_channel() call functions which interpret -1 as a special value meaning "no channel". This patch adds explicit "no_channel" versions instead. On the other hand, after "no_channel" versions are used, ni_set_ai_dma_channel(), ni_set_ao_dma_channel(), ni_set_gpct_dma_channel(), ni_set_cdo_dma_channel() are called with actual "channel" parameter being always unsigned, so their signatures are changed accordingly. A side benefit of the changes is suppressesing 4 sparse warnings: "warning: shift too big (4294967295) for type int". Signed-off-by: Andrzej Pietrasiewicz Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- .../staging/comedi/drivers/ni_mio_common.c | 82 +++++++++++-------- 1 file changed, 49 insertions(+), 33 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c index cbb44fc6940b..5e8130a7d670 100644 --- a/drivers/staging/comedi/drivers/ni_mio_common.c +++ b/drivers/staging/comedi/drivers/ni_mio_common.c @@ -579,48 +579,54 @@ static inline unsigned ni_stc_dma_channel_select_bitfield(unsigned channel) return 0; } -/* negative channel means no channel */ -static inline void ni_set_ai_dma_channel(struct comedi_device *dev, int channel) +static inline void ni_set_ai_dma_channel(struct comedi_device *dev, + unsigned channel) { - unsigned bits = 0; - - if (channel >= 0) - bits = ni_stc_dma_channel_select_bitfield(channel); + unsigned bits = ni_stc_dma_channel_select_bitfield(channel); ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG, NI_E_DMA_AI_SEL_MASK, NI_E_DMA_AI_SEL(bits)); } -/* negative channel means no channel */ -static inline void ni_set_ao_dma_channel(struct comedi_device *dev, int channel) +static inline void ni_set_ai_dma_no_channel(struct comedi_device *dev) { - unsigned bits = 0; + ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG, NI_E_DMA_AI_SEL_MASK, 0); +} - if (channel >= 0) - bits = ni_stc_dma_channel_select_bitfield(channel); +static inline void ni_set_ao_dma_channel(struct comedi_device *dev, + unsigned channel) +{ + unsigned bits = ni_stc_dma_channel_select_bitfield(channel); ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG, NI_E_DMA_AO_SEL_MASK, NI_E_DMA_AO_SEL(bits)); } -/* negative channel means no channel */ +static inline void ni_set_ao_dma_no_channel(struct comedi_device *dev) +{ + ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG, NI_E_DMA_AO_SEL_MASK, 0); +} + static inline void ni_set_gpct_dma_channel(struct comedi_device *dev, unsigned gpct_index, - int channel) + unsigned channel) { - unsigned bits = 0; - - if (channel >= 0) - bits = ni_stc_dma_channel_select_bitfield(channel); + unsigned bits = ni_stc_dma_channel_select_bitfield(channel); ni_set_bitfield(dev, NI_E_DMA_G0_G1_SEL_REG, NI_E_DMA_G0_G1_SEL_MASK(gpct_index), NI_E_DMA_G0_G1_SEL(gpct_index, bits)); } -/* negative mite_channel means no channel */ +static inline void ni_set_gpct_dma_no_channel(struct comedi_device *dev, + unsigned gpct_index) +{ + ni_set_bitfield(dev, NI_E_DMA_G0_G1_SEL_REG, + NI_E_DMA_G0_G1_SEL_MASK(gpct_index), 0); +} + static inline void ni_set_cdo_dma_channel(struct comedi_device *dev, - int mite_channel) + unsigned mite_channel) { struct ni_private *devpriv = dev->private; unsigned long flags; @@ -628,16 +634,26 @@ static inline void ni_set_cdo_dma_channel(struct comedi_device *dev, spin_lock_irqsave(&devpriv->soft_reg_copy_lock, flags); devpriv->cdio_dma_select_reg &= ~NI_M_CDIO_DMA_SEL_CDO_MASK; - if (mite_channel >= 0) { - /* - * XXX just guessing ni_stc_dma_channel_select_bitfield() - * returns the right bits, under the assumption the cdio dma - * selection works just like ai/ao/gpct. - * Definitely works for dma channels 0 and 1. - */ - bits = ni_stc_dma_channel_select_bitfield(mite_channel); - devpriv->cdio_dma_select_reg |= NI_M_CDIO_DMA_SEL_CDO(bits); - } + /* + * XXX just guessing ni_stc_dma_channel_select_bitfield() + * returns the right bits, under the assumption the cdio dma + * selection works just like ai/ao/gpct. + * Definitely works for dma channels 0 and 1. + */ + bits = ni_stc_dma_channel_select_bitfield(mite_channel); + devpriv->cdio_dma_select_reg |= NI_M_CDIO_DMA_SEL_CDO(bits); + ni_writeb(dev, devpriv->cdio_dma_select_reg, NI_M_CDIO_DMA_SEL_REG); + mmiowb(); + spin_unlock_irqrestore(&devpriv->soft_reg_copy_lock, flags); +} + +static inline void ni_set_cdo_dma_no_channel(struct comedi_device *dev) +{ + struct ni_private *devpriv = dev->private; + unsigned long flags; + + spin_lock_irqsave(&devpriv->soft_reg_copy_lock, flags); + devpriv->cdio_dma_select_reg &= ~NI_M_CDIO_DMA_SEL_CDO_MASK; ni_writeb(dev, devpriv->cdio_dma_select_reg, NI_M_CDIO_DMA_SEL_REG); mmiowb(); spin_unlock_irqrestore(&devpriv->soft_reg_copy_lock, flags); @@ -745,7 +761,7 @@ static void ni_release_ai_mite_channel(struct comedi_device *dev) spin_lock_irqsave(&devpriv->mite_channel_lock, flags); if (devpriv->ai_mite_chan) { - ni_set_ai_dma_channel(dev, -1); + ni_set_ai_dma_no_channel(dev); mite_release_channel(devpriv->ai_mite_chan); devpriv->ai_mite_chan = NULL; } @@ -761,7 +777,7 @@ static void ni_release_ao_mite_channel(struct comedi_device *dev) spin_lock_irqsave(&devpriv->mite_channel_lock, flags); if (devpriv->ao_mite_chan) { - ni_set_ao_dma_channel(dev, -1); + ni_set_ao_dma_no_channel(dev); mite_release_channel(devpriv->ao_mite_chan); devpriv->ao_mite_chan = NULL; } @@ -781,7 +797,7 @@ static void ni_release_gpct_mite_channel(struct comedi_device *dev, struct mite_channel *mite_chan = devpriv->counter_dev->counters[gpct_index].mite_chan; - ni_set_gpct_dma_channel(dev, gpct_index, -1); + ni_set_gpct_dma_no_channel(dev, gpct_index); ni_tio_set_mite_channel(&devpriv-> counter_dev->counters[gpct_index], NULL); @@ -799,7 +815,7 @@ static void ni_release_cdo_mite_channel(struct comedi_device *dev) spin_lock_irqsave(&devpriv->mite_channel_lock, flags); if (devpriv->cdo_mite_chan) { - ni_set_cdo_dma_channel(dev, -1); + ni_set_cdo_dma_no_channel(dev); mite_release_channel(devpriv->cdo_mite_chan); devpriv->cdo_mite_chan = NULL; } -- 2.39.5