diff options
Diffstat (limited to 'drivers/staging/comedi/comedidev.h')
| -rw-r--r-- | drivers/staging/comedi/comedidev.h | 139 |
1 files changed, 85 insertions, 54 deletions
diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h index 1b2bbd56f6ef..77be191988ca 100644 --- a/drivers/staging/comedi/comedidev.h +++ b/drivers/staging/comedi/comedidev.h @@ -121,6 +121,7 @@ struct comedi_buf_map { * @buf_read_ptr: buffer position for reader * @cur_chan: current position in chanlist for scan (for those * drivers that use it) + * @scans_done: the number of scans completed (COMEDI_CB_EOS) * @scan_progress: amount received or sent for current scan (in bytes) * @munge_chan: current position in chanlist for "munging" * @munge_count: "munge" count (in bytes, modulo 2**32) @@ -201,6 +202,7 @@ struct comedi_async { unsigned int buf_write_ptr; unsigned int buf_read_ptr; unsigned int cur_chan; + unsigned int scans_done; unsigned int scan_progress; unsigned int munge_chan; unsigned int munge_count; @@ -213,6 +215,28 @@ struct comedi_async { unsigned int x); }; +/** + * comedi_async callback "events" + * @COMEDI_CB_EOS: end-of-scan + * @COMEDI_CB_EOA: end-of-acquisition/output + * @COMEDI_CB_BLOCK: data has arrived, wakes up read() / write() + * @COMEDI_CB_EOBUF: DEPRECATED: end of buffer + * @COMEDI_CB_ERROR: card error during acquisition + * @COMEDI_CB_OVERFLOW: buffer overflow/underflow + * + * @COMEDI_CB_ERROR_MASK: events that indicate an error has occurred + * @COMEDI_CB_CANCEL_MASK: events that will cancel an async command + */ +#define COMEDI_CB_EOS (1 << 0) +#define COMEDI_CB_EOA (1 << 1) +#define COMEDI_CB_BLOCK (1 << 2) +#define COMEDI_CB_EOBUF (1 << 3) +#define COMEDI_CB_ERROR (1 << 4) +#define COMEDI_CB_OVERFLOW (1 << 5) + +#define COMEDI_CB_ERROR_MASK (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW) +#define COMEDI_CB_CANCEL_MASK (COMEDI_CB_EOA | COMEDI_CB_ERROR_MASK) + struct comedi_driver { struct comedi_driver *next; @@ -391,12 +415,61 @@ static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s, return val ^ s->maxdata ^ (s->maxdata >> 1); } -static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd) +/** + * comedi_bytes_per_sample - determine subdevice sample size + * @s: comedi_subdevice struct + * + * The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on + * whether the SDF_LSAMPL subdevice flag is set or not. + * + * Returns the subdevice sample size. + */ +static inline unsigned int comedi_bytes_per_sample(struct comedi_subdevice *s) +{ + return s->subdev_flags & SDF_LSAMPL ? sizeof(int) : sizeof(short); +} + +/** + * comedi_sample_shift - determine log2 of subdevice sample size + * @s: comedi_subdevice struct + * + * The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on + * whether the SDF_LSAMPL subdevice flag is set or not. The log2 of the + * sample size will be 2 or 1 and can be used as the right operand of a + * bit-shift operator to multiply or divide something by the sample size. + * + * Returns log2 of the subdevice sample size. + */ +static inline unsigned int comedi_sample_shift(struct comedi_subdevice *s) { - if (subd->subdev_flags & SDF_LSAMPL) - return sizeof(unsigned int); + return s->subdev_flags & SDF_LSAMPL ? 2 : 1; +} - return sizeof(short); +/** + * comedi_bytes_to_samples - converts a number of bytes to a number of samples + * @s: comedi_subdevice struct + * @nbytes: number of bytes + * + * Returns the number of bytes divided by the subdevice sample size. + */ +static inline unsigned int comedi_bytes_to_samples(struct comedi_subdevice *s, + unsigned int nbytes) +{ + return nbytes >> comedi_sample_shift(s); +} + +/** + * comedi_samples_to_bytes - converts a number of samples to a number of bytes + * @s: comedi_subdevice struct + * @nsamples: number of samples + * + * Returns the number of samples multiplied by the subdevice sample size. + * Does not check for arithmetic overflow. + */ +static inline unsigned int comedi_samples_to_bytes(struct comedi_subdevice *s, + unsigned int nsamples) +{ + return nsamples << comedi_sample_shift(s); } /* @@ -419,18 +492,10 @@ unsigned int comedi_buf_read_n_available(struct comedi_subdevice *s); unsigned int comedi_buf_read_alloc(struct comedi_subdevice *s, unsigned int n); unsigned int comedi_buf_read_free(struct comedi_subdevice *s, unsigned int n); -int comedi_buf_put(struct comedi_subdevice *s, unsigned short x); -int comedi_buf_get(struct comedi_subdevice *s, unsigned short *x); - -void comedi_buf_memcpy_to(struct comedi_subdevice *s, unsigned int offset, - const void *source, unsigned int num_bytes); -void comedi_buf_memcpy_from(struct comedi_subdevice *s, unsigned int offset, - void *destination, unsigned int num_bytes); -unsigned int comedi_write_array_to_buffer(struct comedi_subdevice *s, - const void *data, - unsigned int num_bytes); -unsigned int comedi_read_array_from_buffer(struct comedi_subdevice *s, - void *data, unsigned int num_bytes); +unsigned int comedi_buf_write_samples(struct comedi_subdevice *s, + const void *data, unsigned int nsamples); +unsigned int comedi_buf_read_samples(struct comedi_subdevice *s, + void *data, unsigned int nsamples); /* drivers.c - general comedi driver functions */ @@ -451,6 +516,10 @@ int comedi_dio_insn_config(struct comedi_device *, struct comedi_subdevice *, unsigned int comedi_dio_update_state(struct comedi_subdevice *, unsigned int *data); unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s); +unsigned int comedi_nscans_left(struct comedi_subdevice *s, + unsigned int nscans); +unsigned int comedi_nsamples_left(struct comedi_subdevice *s, + unsigned int nsamples); void comedi_inc_scan_progress(struct comedi_subdevice *s, unsigned int num_bytes); @@ -493,8 +562,6 @@ void comedi_driver_unregister(struct comedi_driver *); module_driver(__comedi_driver, comedi_driver_register, \ comedi_driver_unregister) -#ifdef CONFIG_COMEDI_PCI_DRIVERS - /* comedi_pci.c - comedi PCI driver specific functions */ /* @@ -538,36 +605,6 @@ void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *); module_driver(__comedi_driver, comedi_pci_driver_register, \ comedi_pci_driver_unregister, &(__pci_driver)) -#else - -/* - * Some of the comedi mixed ISA/PCI drivers call the PCI specific - * functions. Provide some dummy functions if CONFIG_COMEDI_PCI_DRIVERS - * is not enabled. - */ - -static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev) -{ - return NULL; -} - -static inline int comedi_pci_enable(struct comedi_device *dev) -{ - return -ENOSYS; -} - -static inline void comedi_pci_disable(struct comedi_device *dev) -{ -} - -static inline void comedi_pci_detach(struct comedi_device *dev) -{ -} - -#endif /* CONFIG_COMEDI_PCI_DRIVERS */ - -#ifdef CONFIG_COMEDI_PCMCIA_DRIVERS - /* comedi_pcmcia.c - comedi PCMCIA driver specific functions */ struct pcmcia_driver; @@ -601,10 +638,6 @@ void comedi_pcmcia_driver_unregister(struct comedi_driver *, module_driver(__comedi_driver, comedi_pcmcia_driver_register, \ comedi_pcmcia_driver_unregister, &(__pcmcia_driver)) -#endif /* CONFIG_COMEDI_PCMCIA_DRIVERS */ - -#ifdef CONFIG_COMEDI_USB_DRIVERS - /* comedi_usb.c - comedi USB driver specific functions */ struct usb_driver; @@ -634,6 +667,4 @@ void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *); module_driver(__comedi_driver, comedi_usb_driver_register, \ comedi_usb_driver_unregister, &(__usb_driver)) -#endif /* CONFIG_COMEDI_USB_DRIVERS */ - #endif /* _COMEDIDEV_H */ |