staging: comedi: drivers.c: document exported functions
Add missing kernel-doc to the low-level COMEDI driver API functions exported from "drivers.c" and tart up some of the existing kernel-doc comments for consistency. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott
Greg Kroah-Hartman
parent
d35d893965
commit
9b34845ee3
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@ -34,6 +34,28 @@ struct comedi_driver *comedi_drivers;
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/* protects access to comedi_drivers */
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DEFINE_MUTEX(comedi_drivers_list_lock);
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/**
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* comedi_set_hw_dev() - Set hardware device associated with COMEDI device
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* @dev: COMEDI device.
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* @hw_dev: Hardware device.
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*
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* For automatically configured COMEDI devices (resulting from a call to
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* comedi_auto_config() or one of its wrappers from the low-level COMEDI
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* driver), comedi_set_hw_dev() is called automatically by the COMEDI core
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* to associate the COMEDI device with the hardware device. It can also be
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* called directly by "legacy" low-level COMEDI drivers that rely on the
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* %COMEDI_DEVCONFIG ioctl to configure the hardware as long as the hardware
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* has a &struct device.
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*
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* If @dev->hw_dev is NULL, it gets a reference to @hw_dev and sets
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* @dev->hw_dev, otherwise, it does nothing. Calling it multiple times
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* with the same hardware device is not considered an error. If it gets
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* a reference to the hardware device, it will be automatically 'put' when
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* the device is detached from COMEDI.
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*
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* Returns 0 if @dev->hw_dev was NULL or the same as @hw_dev, otherwise
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* returns -EEXIST.
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*/
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int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev)
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{
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if (hw_dev == dev->hw_dev)
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@ -52,9 +74,15 @@ static void comedi_clear_hw_dev(struct comedi_device *dev)
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}
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/**
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* comedi_alloc_devpriv() - Allocate memory for the device private data.
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* @dev: comedi_device struct
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* @size: size of the memory to allocate
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* comedi_alloc_devpriv() - Allocate memory for the device private data
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* @dev: COMEDI device.
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* @size: Size of the memory to allocate.
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*
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* The allocated memory is zero-filled. @dev->private points to it on
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* return. The memory will be automatically freed when the COMEDI device is
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* "detached".
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*
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* Returns a pointer to the allocated memory, or NULL on failure.
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*/
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void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size)
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{
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@ -63,6 +91,18 @@ void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size)
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}
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EXPORT_SYMBOL_GPL(comedi_alloc_devpriv);
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/**
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* comedi_alloc_subdevices() - Allocate subdevices for COMEDI device
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* @dev: COMEDI device.
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* @num_subdevices: Number of subdevices to allocate.
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*
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* Allocates and initializes an array of &struct comedi_subdevice for the
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* COMEDI device. If successful, sets @dev->subdevices to point to the
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* first one and @dev->n_subdevices to the number.
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*
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* Returns 0 on success, -EINVAL if @num_subdevices is < 1, or -ENOMEM if
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* failed to allocate the memory.
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*/
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int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices)
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{
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struct comedi_subdevice *s;
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@ -90,8 +130,22 @@ int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices)
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EXPORT_SYMBOL_GPL(comedi_alloc_subdevices);
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/**
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* comedi_alloc_subdev_readback() - Allocate memory for the subdevice readback.
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* @s: comedi_subdevice struct
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* comedi_alloc_subdev_readback() - Allocate memory for the subdevice readback
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* @s: COMEDI subdevice.
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*
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* This is called by low-level COMEDI drivers to allocate an array to record
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* the last values written to a subdevice's analog output channels (at least
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* by the %INSN_WRITE instruction), to allow them to be read back by an
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* %INSN_READ instruction. It also provides a default handler for the
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* %INSN_READ instruction unless one has already been set.
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*
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* On success, @s->readback points to the first element of the array, which
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* is zero-filled. The low-level driver is responsible for updating its
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* contents. @s->insn_read will be set to comedi_readback_insn_read()
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* unless it is already non-NULL.
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*
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* Returns 0 on success, -EINVAL if the subdevice has no channels, or
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* -ENOMEM on allocation failure.
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*/
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int comedi_alloc_subdev_readback(struct comedi_subdevice *s)
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{
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@ -174,10 +228,20 @@ int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s,
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/**
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* comedi_readback_insn_read() - A generic (*insn_read) for subdevice readback.
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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* @insn: comedi_insn struct
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* @data: pointer to return the readback data
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* @dev: COMEDI device.
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* @s: COMEDI subdevice.
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* @insn: COMEDI instruction.
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* @data: Pointer to return the readback data.
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*
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* Handles the %INSN_READ instruction for subdevices that use the readback
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* array allocated by comedi_alloc_subdev_readback(). It may be used
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* directly as the subdevice's handler (@s->insn_read) or called via a
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* wrapper.
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*
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* @insn->n is normally 1, which will read a single value. If higher, the
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* same element of the readback array will be read multiple times.
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*
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* Returns @insn->n on success, or -EINVAL if @s->readback is NULL.
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*/
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int comedi_readback_insn_read(struct comedi_device *dev,
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struct comedi_subdevice *s,
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@ -198,12 +262,21 @@ int comedi_readback_insn_read(struct comedi_device *dev,
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EXPORT_SYMBOL_GPL(comedi_readback_insn_read);
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/**
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* comedi_timeout() - busy-wait for a driver condition to occur.
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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* @insn: comedi_insn struct
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* @cb: callback to check for the condition
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* @context: private context from the driver
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* comedi_timeout() - Busy-wait for a driver condition to occur
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* @dev: COMEDI device.
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* @s: COMEDI subdevice.
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* @insn: COMEDI instruction.
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* @cb: Callback to check for the condition.
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* @context: Private context from the driver.
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*
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* Busy-waits for up to a second (%COMEDI_TIMEOUT_MS) for the condition or
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* some error (other than -EBUSY) to occur. The parameters @dev, @s, @insn,
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* and @context are passed to the callback function, which returns -EBUSY to
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* continue waiting or some other value to stop waiting (generally 0 if the
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* condition occurred, or some error value).
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*
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* Returns -ETIMEDOUT if timed out, otherwise the return value from the
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* callback function.
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*/
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int comedi_timeout(struct comedi_device *dev,
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struct comedi_subdevice *s,
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@ -228,12 +301,30 @@ int comedi_timeout(struct comedi_device *dev,
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EXPORT_SYMBOL_GPL(comedi_timeout);
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/**
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* comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices.
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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* @insn: comedi_insn struct
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* @data: parameters for the @insn
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* @mask: io_bits mask for grouped channels
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* comedi_dio_insn_config() - Boilerplate (*insn_config) for DIO subdevices
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* @dev: COMEDI device.
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* @s: COMEDI subdevice.
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* @insn: COMEDI instruction.
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* @data: Instruction parameters and return data.
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* @mask: io_bits mask for grouped channels, or 0 for single channel.
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*
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* If @mask is 0, it is replaced with a single-bit mask corresponding to the
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* channel number specified by @insn->chanspec. Otherwise, @mask
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* corresponds to a group of channels (which should include the specified
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* channel) that are always configured together as inputs or outputs.
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*
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* Partially handles the %INSN_CONFIG_DIO_INPUT, %INSN_CONFIG_DIO_OUTPUTS,
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* and %INSN_CONFIG_DIO_QUERY instructions. The first two update
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* @s->io_bits to record the directions of the masked channels. The last
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* one sets @data[1] to the current direction of the group of channels
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* (%COMEDI_INPUT) or %COMEDI_OUTPUT) as recorded in @s->io_bits.
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*
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* The caller is responsible for updating the DIO direction in the hardware
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* registers if this function returns 0.
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*
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* Returns 0 for a %INSN_CONFIG_DIO_INPUT or %INSN_CONFIG_DIO_OUTPUT
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* instruction, @insn->n (> 0) for a %INSN_CONFIG_DIO_QUERY instruction, or
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* -EINVAL for some other instruction.
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*/
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int comedi_dio_insn_config(struct comedi_device *dev,
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struct comedi_subdevice *s,
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@ -268,9 +359,18 @@ int comedi_dio_insn_config(struct comedi_device *dev,
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EXPORT_SYMBOL_GPL(comedi_dio_insn_config);
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/**
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* comedi_dio_update_state() - update the internal state of DIO subdevices.
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* @s: comedi_subdevice struct
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* @data: the channel mask and bits to update
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* comedi_dio_update_state() - Update the internal state of DIO subdevices
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* @s: COMEDI subdevice.
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* @data: The channel mask and bits to update.
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*
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* Updates @s->state which holds the internal state of the outputs for DIO
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* or DO subdevices (up to 32 channels). @data[0] contains a bit-mask of
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* the channels to be updated. @data[1] contains a bit-mask of those
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* channels to be set to '1'. The caller is responsible for updating the
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* outputs in hardware according to @s->state. As a minimum, the channels
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* in the returned bit-mask need to be updated.
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*
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* Returns @mask with non-existent channels removed.
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*/
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unsigned int comedi_dio_update_state(struct comedi_subdevice *s,
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unsigned int *data)
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@ -290,17 +390,17 @@ unsigned int comedi_dio_update_state(struct comedi_subdevice *s,
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EXPORT_SYMBOL_GPL(comedi_dio_update_state);
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/**
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* comedi_bytes_per_scan - get length of asynchronous command "scan" in bytes
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* @s: comedi_subdevice struct
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* comedi_bytes_per_scan() - Get length of asynchronous command "scan" in bytes
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* @s: COMEDI subdevice.
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*
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* Determines the overall scan length according to the subdevice type and the
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* number of channels in the scan.
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*
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* For digital input, output or input/output subdevices, samples for multiple
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* channels are assumed to be packed into one or more unsigned short or
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* unsigned int values according to the subdevice's SDF_LSAMPL flag. For other
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* types of subdevice, samples are assumed to occupy a whole unsigned short or
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* unsigned int according to the SDF_LSAMPL flag.
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* For digital input, output or input/output subdevices, samples for
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* multiple channels are assumed to be packed into one or more unsigned
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* short or unsigned int values according to the subdevice's %SDF_LSAMPL
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* flag. For other types of subdevice, samples are assumed to occupy a
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* whole unsigned short or unsigned int according to the %SDF_LSAMPL flag.
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*
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* Returns the overall scan length in bytes.
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*/
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@ -326,18 +426,18 @@ unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s)
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EXPORT_SYMBOL_GPL(comedi_bytes_per_scan);
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/**
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* comedi_nscans_left - return the number of scans left in the command
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* @s: comedi_subdevice struct
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* @nscans: the expected number of scans
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* comedi_nscans_left() - Return the number of scans left in the command
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* @s: COMEDI subdevice.
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* @nscans: The expected number of scans or 0 for all available scans.
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*
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* If nscans is 0, the number of scans available in the async buffer will be
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* used. Otherwise the expected number of scans will be used.
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* If @nscans is 0, it is set to the number of scans available in the
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* async buffer.
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*
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* If the async command has a stop_src of TRIG_COUNT, the nscans will be
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* checked against the number of scans left in the command.
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* If the async command has a stop_src of %TRIG_COUNT, the @nscans will be
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* checked against the number of scans remaining to complete the command.
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*
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* The return value will then be either the expected number of scans or the
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* number of scans remaining in the command.
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* number of scans remaining to complete the command, whichever is fewer.
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*/
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unsigned int comedi_nscans_left(struct comedi_subdevice *s,
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unsigned int nscans)
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@ -365,12 +465,12 @@ unsigned int comedi_nscans_left(struct comedi_subdevice *s,
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EXPORT_SYMBOL_GPL(comedi_nscans_left);
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/**
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* comedi_nsamples_left - return the number of samples left in the command
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* @s: comedi_subdevice struct
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* @nsamples: the expected number of samples
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* comedi_nsamples_left() - Return the number of samples left in the command
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* @s: COMEDI subdevice.
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* @nsamples: The expected number of samples.
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*
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* Returns the expected number of samples of the number of samples remaining
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* in the command.
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* Returns the number of samples remaining to complete the command, or the
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* specified expected number of samples (@nsamples), whichever is fewer.
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*/
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unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
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unsigned int nsamples)
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@ -399,14 +499,14 @@ unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
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EXPORT_SYMBOL_GPL(comedi_nsamples_left);
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/**
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* comedi_inc_scan_progress - update scan progress in asynchronous command
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* @s: comedi_subdevice struct
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* @num_bytes: amount of data in bytes to increment scan progress
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* comedi_inc_scan_progress() - Update scan progress in asynchronous command
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* @s: COMEDI subdevice.
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* @num_bytes: Amount of data in bytes to increment scan progress.
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*
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* Increments the scan progress by the number of bytes specified by num_bytes.
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* Increments the scan progress by the number of bytes specified by @num_bytes.
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* If the scan progress reaches or exceeds the scan length in bytes, reduce
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* it modulo the scan length in bytes and set the "end of scan" asynchronous
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* event flag to be processed later.
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* event flag (%COMEDI_CB_EOS) to be processed later.
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*/
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void comedi_inc_scan_progress(struct comedi_subdevice *s,
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unsigned int num_bytes)
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@ -437,12 +537,12 @@ void comedi_inc_scan_progress(struct comedi_subdevice *s,
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EXPORT_SYMBOL_GPL(comedi_inc_scan_progress);
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/**
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* comedi_handle_events - handle events and possibly stop acquisition
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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* comedi_handle_events() - Handle events and possibly stop acquisition
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* @dev: COMEDI device.
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* @s: COMEDI subdevice.
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*
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* Handles outstanding asynchronous acquisition event flags associated
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* with the subdevice. Call the subdevice's "->cancel()" handler if the
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* with the subdevice. Call the subdevice's @s->cancel() handler if the
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* "end of acquisition", "error" or "overflow" event flags are set in order
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* to stop the acquisition at the driver level.
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*
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@ -677,12 +777,19 @@ static void comedi_report_boards(struct comedi_driver *driv)
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}
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/**
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* comedi_load_firmware() - Request and load firmware for a device.
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* @dev: comedi_device struct
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* @hw_device: device struct for the comedi_device
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* @name: the name of the firmware image
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* @cb: callback to the upload the firmware image
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* @context: private context from the driver
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* comedi_load_firmware() - Request and load firmware for a device
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* @dev: COMEDI device.
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* @device: Hardware device.
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* @name: The name of the firmware image.
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* @cb: Callback to the upload the firmware image.
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* @context: Private context from the driver.
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*
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* Sends a firmware request for the hardware device and waits for it. Calls
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* the callback function to upload the firmware to the device, them releases
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* the firmware.
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*
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* Returns 0 on success, -EINVAL if @cb is NULL, or a negative error number
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* from the firmware request or the callback function.
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*/
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int comedi_load_firmware(struct comedi_device *dev,
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struct device *device,
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@ -709,10 +816,16 @@ int comedi_load_firmware(struct comedi_device *dev,
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EXPORT_SYMBOL_GPL(comedi_load_firmware);
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/**
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* __comedi_request_region() - Request an I/O reqion for a legacy driver.
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* @dev: comedi_device struct
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* @start: base address of the I/O reqion
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* @len: length of the I/O region
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* __comedi_request_region() - Request an I/O region for a legacy driver
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* @dev: COMEDI device.
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* @start: Base address of the I/O region.
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* @len: Length of the I/O region.
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*
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* Requests the specified I/O port region which must start at a non-zero
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* address.
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*
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* Returns 0 on success, -EINVAL if @start is 0, or -EIO if the request
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* fails.
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*/
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int __comedi_request_region(struct comedi_device *dev,
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unsigned long start, unsigned long len)
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@ -735,10 +848,19 @@ int __comedi_request_region(struct comedi_device *dev,
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EXPORT_SYMBOL_GPL(__comedi_request_region);
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/**
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* comedi_request_region() - Request an I/O reqion for a legacy driver.
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* @dev: comedi_device struct
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* @start: base address of the I/O reqion
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* @len: length of the I/O region
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* comedi_request_region() - Request an I/O region for a legacy driver
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* @dev: COMEDI device.
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* @start: Base address of the I/O region.
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* @len: Length of the I/O region.
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*
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* Requests the specified I/O port region which must start at a non-zero
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* address.
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*
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* On success, @dev->iobase is set to the base address of the region and
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* @dev->iolen is set to its length.
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*
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* Returns 0 on success, -EINVAL if @start is 0, or -EIO if the request
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* fails.
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*/
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int comedi_request_region(struct comedi_device *dev,
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unsigned long start, unsigned long len)
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@ -756,8 +878,16 @@ int comedi_request_region(struct comedi_device *dev,
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EXPORT_SYMBOL_GPL(comedi_request_region);
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/**
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* comedi_legacy_detach() - A generic (*detach) function for legacy drivers.
|
||||
* @dev: comedi_device struct
|
||||
* comedi_legacy_detach() - A generic (*detach) function for legacy drivers
|
||||
* @dev: COMEDI device.
|
||||
*
|
||||
* This is a simple, generic 'detach' handler for legacy COMEDI devices that
|
||||
* just use a single I/O port region and possibly an IRQ and that don't need
|
||||
* any special clean-up for their private device or subdevice storage. It
|
||||
* can also be called by a driver-specific 'detach' handler.
|
||||
*
|
||||
* If @dev->irq is non-zero, the IRQ will be freed. If @dev->iobase and
|
||||
* @dev->iolen are both non-zero, the I/O port region will be released.
|
||||
*/
|
||||
void comedi_legacy_detach(struct comedi_device *dev)
|
||||
{
|
||||
|
|
@ -831,6 +961,29 @@ out:
|
|||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* comedi_auto_config() - Create a COMEDI device for a hardware device
|
||||
* @hardware_device: Hardware device.
|
||||
* @driver: COMEDI low-level driver for the hardware device.
|
||||
* @context: Driver context for the auto_attach handler.
|
||||
*
|
||||
* Allocates a new COMEDI device for the hardware device and calls the
|
||||
* low-level driver's 'auto_attach' handler to set-up the hardware and
|
||||
* allocate the COMEDI subdevices. Additional "post-configuration" setting
|
||||
* up is performed on successful return from the 'auto_attach' handler.
|
||||
* If the 'auto_attach' handler fails, the low-level driver's 'detach'
|
||||
* handler will be called as part of the clean-up.
|
||||
*
|
||||
* This is usually called from a wrapper function in a bus-specific COMEDI
|
||||
* module, which in turn is usually called from a bus device 'probe'
|
||||
* function in the low-level driver.
|
||||
*
|
||||
* Returns 0 on success, -EINVAL if the parameters are invalid or the
|
||||
* post-configuration determines the driver has set the COMEDI device up
|
||||
* incorrectly, -ENOMEM if failed to allocate memory, -EBUSY if run out of
|
||||
* COMEDI minor device numbers, or some negative error number returned by
|
||||
* the driver's 'auto_attach' handler.
|
||||
*/
|
||||
int comedi_auto_config(struct device *hardware_device,
|
||||
struct comedi_driver *driver, unsigned long context)
|
||||
{
|
||||
|
|
@ -888,6 +1041,22 @@ int comedi_auto_config(struct device *hardware_device,
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(comedi_auto_config);
|
||||
|
||||
/**
|
||||
* comedi_auto_unconfig() - Unconfigure auto-allocated COMEDI device
|
||||
* @hardware_device: Hardware device previously passed to
|
||||
* comedi_auto_config().
|
||||
*
|
||||
* Cleans up and eventually destroys the COMEDI device allocated by
|
||||
* comedi_auto_config() for the same hardware device. As part of this
|
||||
* clean-up, the low-level COMEDI driver's 'detach' handler will be called.
|
||||
* (The COMEDI device itself will persist in an unattached state if it is
|
||||
* still open, until it is released, and any mmapped buffers will persist
|
||||
* until they are munmapped.)
|
||||
*
|
||||
* This is usually called from a wrapper module in a bus-specific COMEDI
|
||||
* module, which in turn is usually set as the bus device 'remove' function
|
||||
* in the low-level COMEDI driver.
|
||||
*/
|
||||
void comedi_auto_unconfig(struct device *hardware_device)
|
||||
{
|
||||
if (!hardware_device)
|
||||
|
|
@ -896,6 +1065,17 @@ void comedi_auto_unconfig(struct device *hardware_device)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(comedi_auto_unconfig);
|
||||
|
||||
/**
|
||||
* comedi_driver_register() - Register a low-level COMEDI driver
|
||||
* @driver: Low-level COMEDI driver.
|
||||
*
|
||||
* The low-level COMEDI driver is added to the list of registered COMEDI
|
||||
* drivers. This is used by the handler for the "/proc/comedi" file and is
|
||||
* also used by the handler for the %COMEDI_DEVCONFIG ioctl to configure
|
||||
* "legacy" COMEDI devices (for those low-level drivers that support it).
|
||||
*
|
||||
* Returns 0.
|
||||
*/
|
||||
int comedi_driver_register(struct comedi_driver *driver)
|
||||
{
|
||||
mutex_lock(&comedi_drivers_list_lock);
|
||||
|
|
@ -907,6 +1087,15 @@ int comedi_driver_register(struct comedi_driver *driver)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(comedi_driver_register);
|
||||
|
||||
/**
|
||||
* comedi_driver_unregister() - Unregister a low-level COMEDI driver
|
||||
* @driver: Low-level COMEDI driver.
|
||||
*
|
||||
* The low-level COMEDI driver is removed from the list of registered COMEDI
|
||||
* drivers. Detaches any COMEDI devices attached to the driver, which will
|
||||
* result in the low-level driver's 'detach' handler being called for those
|
||||
* devices before this function returns.
|
||||
*/
|
||||
void comedi_driver_unregister(struct comedi_driver *driver)
|
||||
{
|
||||
struct comedi_driver *prev;
|
||||
|
|
|
|||
Loading…
Reference in a new issue