Messages in this thread |  | | | Date | Thu, 24 May 2007 21:15:47 +0200 | | From | "Lars K.W. Gohlke" <> | | Subject | Re: How to access correctly serial port inside module? |
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jan Engelhardt schrieb: > On May 24 2007 19:19, Lars K.W. Gohlke wrote: >> I want to read from serial port (I mean the port, which is called >> /dev/ttyS0 in user-space). Then I want copy_to_user() it through >> /proc/serialPort >> >> This is just to get familiar with driver programming (in kernelspace), >> it could be better done in userspace - I know. But this is for learning. >> >> It is a kind of synthetic problem, but after this, I hope too know how >> to handle further ones. >> >> Understood? It is a little bit strange, but hope it is explained well. ;) >> >> If tell me that for /dev/ttyS0 I can adept it to /dev/ttyS1 etc.. > > > struct file *filp = filp_open("/dev/ttyS0"); > char buf[4096]; > mm_segment_t oldfs = get_fs(); > loff_t pos = 0; > > set_ds(KERNEL_DS); > while (vfs_read(filp, buf, sizeof(buf), &pos) > 0) > printk("%s\n", buf); > > filp_close(filp); > > > > [I've warned about it... ;-) ] > > Jan is it the way to access from kernelspace the userspace fs? the not-correct-way?
If it is so, I will wait for another solution ;)
Dont want to learn writing nasty kernel code. *g*
Anyway thx. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) - GPGrelay v0.959 iD8DBQFGVeRlAAomYJ1taN8RAj4LAJ4oD+3yGy6k69nBEXi5BSda+tdeNACeOCTY +nJSUcsGpwh25uDjyC2GKRU= =twVz -----END PGP SIGNATURE-----begin:vcard fn:Lars K.W. Gohlke n:Gohlke;Lars K.W. email;internet:lkwg82@gmx.de x-mozilla-html:FALSE version:2.1 end:vcard
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