sorry....the API is usb_read() etc - essentially these are from libusb.so: usb_bulk_read usb_bulk_write usb_busses usb_claim_interface usb_clear_halt usb_close usb_control_msg usb_device usb_find_busses usb_find_devices usb_get_busses usb_get_descriptor usb_get_descriptor_by_endpoint usb_get_string usb_get_string_simple usb_init usb_interrupt_read usb_interrupt_write usb_open usb_release_interface usb_reset usb_resetep usb_set_altinterface usb_set_configuration usb_set_debug usb_strerror On Fri, Sep 18, 2009 at 7:56 AM, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote: > what kind of device is that? USB/PCI etc based? for many USB > devices, u just need userspace tools. For eg: > > 1. libusb-devel (or libusb-dev....depending on the distros), or > libpci etc....for writing userspace application to talk to the device. > 2. add udev rules. (for eg, this url: > > http://wiki.lynxworks.eu/misc/e1550 > > shows how to add a new device in different distro). The application > that issued the read() in this case is usb_modeswitch. Download the > sourcecode from: > > http://www.draisberghof.de/usb_modeswitch/ > > and see how it uses libusb+read/write/open to talk to the device. > > > On Thu, Sep 17, 2009 at 2:59 PM, Leonidas . <leonidas137@xxxxxxxxx> wrote: >> >> >> Hi list, >> >> I know that introducing/using new ioctls is frawned upon by the community. >> They might still be needed for controlling various hw parameters, Just >> wanted >> to understand the data transfer side of ioctls with a use case. >> >> E.g. My kernel module needs to pass a buffer of 1-2Mb to userspace >> whenever user requests. The buffer will contain different kind of data >> depending >> on different commands i.e. assume that I maintain 3 types of buffers in my >> module. >> >> Now, with ioctls it is much easiler to get the buffer to userspace simply by >> issusing >> different commands. But if I have to achive the same functionality using >> read() call >> how would I do it? Meaning ioctl kind of multiplexes the things which might >> be >> needed in some cases. How would I do this kind of stuff with read()? By >> having 3 >> different minor devices and issuing read() on 3 devices for getting 3 >> buffers? >> >> I am not looking for anyother mechanism of trasnfering data to userspace as >> of now >> since this data would be really sporadic. I have to choose between ioctl and >> read. >> >> -Leo. >> > > > > -- > Regards, > Peter Teoh > -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
