Patch "staging: comedi: adl_pci7x3x: fix digital output on PCI-7230" has been added to the 4.2-stable tree

This is a note to let you know that I've just added the patch titled

staging: comedi: adl_pci7x3x: fix digital output on PCI-7230

to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     staging-comedi-adl_pci7x3x-fix-digital-output-on-pci-7230.patch

and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ian Abbott <[email protected]>
Date: Tue, 11 Aug 2015 13:05:10 +0100
Subject: staging: comedi: adl_pci7x3x: fix digital output on PCI-7230

From: Ian Abbott <[email protected]>

commit ad83dbd974feb2e2a8cc071a1d28782bd4d2c70e upstream.

The "adl_pci7x3x" driver replaced the "adl_pci7230" and "adl_pci7432" drivers in commits 8f567c373c4b ("staging: comedi: new adl_pci7x3x driver") and 657f77d173d3 ("staging: comedi: remove adl_pci7230 and adl_pci7432 drivers"). Although the new driver code agrees with the user manuals for the respective boards, digital outputs stopped working on the PCI-7230. This has 16 digital output channels and the previous adl_pci7230 driver shifted the 16 bit output state left by 16 bits before writing to the hardware register. The new adl_pci7x3x driver doesn't do that. Fix it in adl_pci7x3x_do_insn_bits() by checking for the special case of the subdevice having only 16 channels and duplicating the 16 bit output state into both halves of the 32-bit register. That should work both for what the board actually does and for what the user manual says it should do.

---
 drivers/staging/comedi/drivers/adl_pci7x3x.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

@@ -120,8 +120,20 @@ static int adl_pci7x3x_do_insn_bits(stru
 {
 	unsigned long reg = (unsigned long)s->private;
 
-	if (comedi_dio_update_state(s, data))
-		outl(s->state, dev->iobase + reg);
+	if (comedi_dio_update_state(s, data)) {
+		unsigned int val = s->state;
+
+		if (s->n_chan == 16) {
+			/*
+			 * It seems the PCI-7230 needs the 16-bit DO state
+			 * to be shifted left by 16 bits before being written
+			 * to the 32-bit register.  Set the value in both
+			 * halves of the register to be sure.
+			 */
+			val |= val << 16;
+		}
+		outl(val, dev->iobase + reg);
+	}
 
 	data[1] = s->state;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/staging-comedi-usbduxsigma-don-t-clobber-ao_timer-in-command-test.patch queue-4.2/staging-comedi-adl_pci7x3x-fix-digital-output-on-pci-7230.patch queue-4.2/staging-comedi-usbduxsigma-don-t-clobber-ai_timer-in-command-test.patch