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staging: comedi: comedi_pcmcia: introduce comedi_pcmcia_{enable, disable}
Introduce some helper functions to enable/disable the PCMCIA device. This will allow removing some of the boilerplate code in the comedi PCMCIA drivers. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 49 additions and 0 deletions
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@ -37,6 +37,52 @@ struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *dev)
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}
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EXPORT_SYMBOL_GPL(comedi_to_pcmcia_dev);
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static int comedi_pcmcia_conf_check(struct pcmcia_device *link,
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void *priv_data)
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{
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if (link->config_index == 0)
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return -EINVAL;
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return pcmcia_request_io(link);
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}
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/**
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* comedi_pcmcia_enable() - Request the regions and enable the PCMCIA device.
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* @dev: comedi_device struct
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*
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* The comedi PCMCIA driver needs to set the link->config_flags, as
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* appropriate for that driver, before calling this function in order
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* to allow pcmcia_loop_config() to do its internal autoconfiguration.
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*/
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int comedi_pcmcia_enable(struct comedi_device *dev)
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{
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struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
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int ret;
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if (!link)
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return -ENODEV;
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ret = pcmcia_loop_config(link, comedi_pcmcia_conf_check, NULL);
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if (ret)
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return ret;
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return pcmcia_enable_device(link);
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}
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EXPORT_SYMBOL_GPL(comedi_pcmcia_enable);
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/**
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* comedi_pcmcia_disable() - Disable the PCMCIA device and release the regions.
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* @dev: comedi_device struct
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*/
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void comedi_pcmcia_disable(struct comedi_device *dev)
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{
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struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
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if (link)
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pcmcia_disable_device(link);
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}
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EXPORT_SYMBOL_GPL(comedi_pcmcia_disable);
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/**
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* comedi_pcmcia_auto_config() - Configure/probe a comedi PCMCIA driver.
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* @link: pcmcia_device struct
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@ -440,6 +440,9 @@ struct pcmcia_device;
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struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *);
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int comedi_pcmcia_enable(struct comedi_device *);
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void comedi_pcmcia_disable(struct comedi_device *);
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int comedi_pcmcia_auto_config(struct pcmcia_device *, struct comedi_driver *);
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void comedi_pcmcia_auto_unconfig(struct pcmcia_device *);
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